Alcator C-Mod Run 960202 Information

Miniproposals

Miniproposal: 129a

Date Filed: 12/4/1995

Title: Impurity screening in limiter discharges

First Author: Gary McCracken

Session Leader: Robert Granetz (shots 1-40)

Operators
Session leader(s):	Robert Granetz
Physics operator(s):	John Goetz
Engineering operator(s):	Vinny Bertolino,Joe Daigle

Engineering Operator Run Comment
the big guys goetz/granetz

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:15:070PM

Author: To Be Determined

Run summary for MP 129A, Impurity screening in limiter discharges (continued
from 951208)

SL: R. Granetz
PO: J. Goetz
EC: V. Bertolino

Primary goal: measure screening of nitrogen in limiter plasmas at low and
high densities, and puffing from different spatial locations. Several
diverted shots and background shots will be included for baselines.

Secondary goal: measure screening of argon in limiter plasmas at high
densities. We didn't get to this last time. At the lower densities,
the ratio of divertor-to-limiter screening was about 8, which was
inexplicably higher that the factor of 2 seen a year ago.

-------------------------------------------------------------------------------
Summary: We finished the primary goal, i.e nitrogen screening at low and
high(?) density, with the caveat that the high density was only
nl=1.6e20 m-2. There was no time to do any argon experiments.

The zero-th order result is that the ratio of impurity penetration
between limiter and ATTACHED divertor plasmas was essentially
infinite, but the ratio between limiter and DETACHED divertor plasmas
was a factor of 1 to 3, depending on the puff location. This is a
very preliminary result, based upon the net pressure drop in the
NINJA plenum (for total molecules injected) and the brightness of
the NVII line (for nitrogen concentration in plasma core). A lot of
calibrations of the NINJA system and the McPherson, as well as MIST
runs, are required before we have absolute numbers on the screening
efficiency.

Other findings today: The SOL temperatures were slightly higher than
last time: 40 eV in limiter discharges and 60 eV in diverted plasmas.
Heavy nitrogen puffing definitely caused fast detachment at a density
of nl=1.0e20 m-2.

See the end of this report for a table of good shots.

-------------------------------------------------------------------------------
Shot sequence plan:

Fiducial shot (diverted, no impurity puffing)

Fiducial shot (no RF) with nitrogen puff from B-side-lower

Limiter shot, nl_04=1.0e20 m-2, no N2
" " N2 from B-side-lower
" " N2 from NINJA inboard
" " N2 from NINJA divertor
" " N2 from NINJA outboard (if time permits)

Fiducial shot (no RF) with nitrogen puff from B-side-lower, BUT at
nl_04=2.0e20 m-2.

Limiter shot, nl_04=2.0e20 m-2, no N2 (or the highest nl we can get)
" " N2 from B-side-lower
" " N2 from NINJA inboard
" " N2 from NINJA divertor
" " N2 from NINJA outboard (if time permits)

If we get through all of this, then we'd like to repeat the high density
part of the run using argon instead of nitrogen and/or do an intermediate
density.

-------------------------------------------------------------------------------

Shot 01 -- Fiducial. Good shot.

Shot 02 -- Diverted plasma (fiducial w/o RF) with nitrogen puff from B-side
(20 ms pulse). I can't see anything on the Chromex at 463 nm (NII).

Next shot: repeat diverted plasma, but increase N2 pulse length
to 100 ms on the B-side-lower valve.

Note on filling NINJA system: 2.8 psi at PLC = 149 torr on NINJA

Shot 03 -- Diverted plasma w/100 ms N2 puff from B-side-lower at t=0.5-0.6 s.
Small increases seen on 2pi bolo (and soft x-rays) starting at
0.55 s. Increase decays when puff ends, as expected for a non-
recycling impurity. Chromex clearly sees N2 puff from 0.55 to
about 0.80 s. Intensity peaks at 2400 counts (lambda=462.27 to
463.71 nm, NII line). Good diverted measurement. (Bruce changed
to the highest-resolution grating prior to this shot.) Brian
fired the FSP, everything normal.

Note: JT reports that the McPherson didn't work on this shot. We
may have to repeat this later, since we need that data to get
internal N2 concentrations.

Shot 04 -- Limiter plasma, no N2. Doesn't has a flattop, but doesn't matter,
since there's no N2 and the Chromex doesn't see anything above the
noise level (about 200 counts), as expected.

Shot 05 -- Limiter plasma, 20 ms N2 puff at t=0.5 s. Chromex doesn't see
much, at least after 0.5 s. Brian reports that nearly 2 cm of
scrape off wrap around to the inboard wall. He also says that the
compression ratio is nearly 100!. For the next shot, lengthen N2
puff to 100 ms.

Shot 06 -- Limiter plasma, 100 ms N2 puff at t=0.5-0.6 s. No 2pi bolo data.
Nothing on soft x-rays. Chromex peaks at 2000-2500 counts (similar
to diverted plasma). JT reports 0.2e14 ph/s-ster-cm2 for H-like
Lyman alpha line of Nitrogen (from McPherson). JT has made a scope
to look at the brightness of this line vs time: user9:[terry.
scopes]NVII.dat

Shot 07 -- Limiter plasma, w/NINJA inboard midplane N2 puff. (B-side disabled)
Puff time is t=0.5-0.8 s, but it shows up from about 0.7 to 1.0 s.
Chromex has nearly the same NII brightness as for 100 ms puff from
B-side valve. McPherson has about the same signal as the previous
shot as well (about 0.2e14). H-alpha (recycling light) increases
dramatically during the N2 puff. JT would like at least a factor
of 2 more signal, so for the next shot, increase NINJA plenum
pressure from 2.8 to 5.0 psi (149 to 262 torr).

Shot 08 -- Limiter plasma, w/higher pressure NINJA inboard midplane N2 puff.
Chromex measures 10000 counts, McPherson measures 0.9e14. This
is somewhat too much. Large perturbations in 2pi, x-rays, H-alpha,
Zeff, etc. For the next shot, shorten NINJA pulse from 0.300 to
0.200 s.

Shot 09 -- Limiter plasma, w/ NINJA inboard midplane N2 puff. Still too much
perturbation on the plasma. McPherson: 0.8e14, Chromex: 11000.
Next shot: lower NINJA plenum pressure from 5.0 to 4.0 psi (262 to
205 torr).

Shot 10 -- Limiter plasma w/NINJA inboard midplane N2 puff. Less N2, but
still perturbative. Chromex: 4500 counts, McPherson: 0.6-0.7e14.
Plume is visible on LANL fast camera. It initially goes downward,
then flips to opposite direction. Marfe shakes around alot too.
These NINJA plenum settings are what we will use for the rest
of the limiter plasmas (205 torr or 4.0 psi, t=0.5 to 0.7 s).

Shot 11 -- Limiter plasma w/NINJA N2 puff from divertor private flux zone.
Magnetics TRAQ_2 failed --> no EFIT. McPherson: 0.2e14, 100's counts
There was clearly a lot less N2 in this plasma, which is expected
since the puff came from the divertor region, not the inboard
midplane.

Shot 12 -- Fizzle.

Shot 13 -- Limiter plasma w/NINJA N2 puff from outboard side. Chromex: 300
counts, McPherson: 0.2e14

Shot 14 -- Limiter plasma w/o any N2 puff. Good background limiter shot.
McPherson: 0.08e14 ph/s-ster-cm2, Chromex: about 300 counts. No
perturbations on density, 2pi bolo, x-rays, but still a noticeable
H-alpha marfe.

Shot 15 -- Diverted plasma w/NINJA inboard midplane N2 puff, for comparison to
today's limiter plasmas. Chromex: 1200-1500 counts. No discernible
signal on the McPherson, so we'll have to repeat at higher plenum
pressure. New setting is 6.9 psi, or 349 torr.

Shot 16 -- Diverted plasma w/higher pressure NINJA inboard midplane N2 puff.
Chromex: 3000 counts, McPherson: still no discernible signal.
So far, the ratio of screening between limiter and (attached)
divertor plasmas is infinite! Next shot: increase plenum pressure
again. New setting is 15 psi, or 733 torr.

Shot 17 -- Diverted plasma w/much higher pressure NINJA inboard midplane N2
puff. Disrupted at 0.69 s! Nitrogen causes detachment, which
leads to the disruption, apparently. Obviously there was too much
nitrogen. Reduce the plenum pressure from the next shot to 11.8 psi
or 582 torr.

Shot 18 -- Diverted plasma w/NINJA inboard midplane N2 puff. Plenum settings
were 11.8 psi (582 torr), with pulse from t=0.5 to 0.7 s. Plasma
detaches, but doesn't disrupt. McPherson: 0.7e14, Chromex: 10500
counts. These are the same readings as the limiter plasma (shots
008, 009, and 010, 007). Ratio of screening for limiter to
detached divertor is of order unity.

Shot 19 -- Diverted plasma w/NINJA outboard N2 puff. Similar, or even less
screening than the previous shot. Chromex: 3000 counts,
McPherson: 1.0e14.

This finishes the portion of the run at nl_04=1.0e20 m-2. Next, try to repeat
these measurements in higher density plasmas.

Shot 20 -- Diverted plasma at higher density, w/o N2 puff. Density only
made it to nl_04=1.7e20 m-2 at 1.0 s, then the plasma disrupted
during the rampdown. It's clearly going to take some work to get
the higher density, and I'd rather do it in limiter plasmas.

Shot 21 -- Limiter plasma at higher density, w/o N2 puff. Density only
makes it to nl_04=1.5-1.7e20 m-2. No nitrogen above background seen
on either the Chromex or the McPherson. Could be a good background
shot at this density. Try again with higher deuterium plenum
pressure.

Shot 22 -- Limiter plasma at higher density, w/o N2 puff. Minor disruptions
starting at 0.32 s, terminated at 0.44 s. Looks like we'll have
to settle for nl_04=1.6e20 m-2.

Shot 23 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA inboard
midplane. Minor disruptions and early termination, just like last
shot. John will lower the deuterium plenum pressure for the next
shot.

Shot 24 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA inboard
midplane. McPherson: 0.2e14, Chromex: 1800 counts.

Shot 25 -- Fizzle. It's been noticed that the results from the previous
shot are about 1/3 the levels of the corresponding shot at lower
density (shot 010). JT has requested more signal, so for the next
shot, the NINJA plenum pressure will be increased to 6.6 psi (302
torr).

Shot 26 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA outboard side.
NINJA plenum is at 302 torr (6.6 psi). Disrupted at 0.59 s.

Shot 27 -- Fizzle.

Shot 28 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA outboard side.
McPherson: 0.3e14, Chromex: 1000 counts.

Shot 29 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA private flux
zone. McPherson: 0.3-0.35e14, Chromex: 1500 counts.

Shot 30 -- Diverted plasma at 1.6e20 m-2 with N2 puff from NINJA inboard
midplane. Plenum pressure is still 297 torr. McPherson: 0.09e14,
Chromex: 3000 counts. Signal is a little low. For next shot, raise
NINJA plenum pressure to 10.5 psi, or 527 torr.

Shot 31 -- Diverted plasma at 1.6e20 m-2 with N2 puff from NINJA inboard
midplane. Plenum pressure is 527 torr. Disrupted at 0.72 s.
Too much nitrogen, no doubt. Plasma detached. Must reduce
NINJA plenum pressure somewhat.

Shot 32 -- Diverted plasma at 1.6e20 m-2 with N2 puff from NINJA inboard
midplane. Plenum pressure is 440 torr (8.8 psi). Disrupted at
0.84 s, again due to too much nitrogen. Give up on this one at
move on. We already have acceptable data here from shot 030.

Shot 33 -- Diverted plasma at 1.6e20 m-2 with N2 puff from NINJA outboard
midplane. Plenum pressure is 440 torr. Disrupted at 0.70 s.
It turns out that Bruce mistakenly had both the inboard and
outboard capillaries enabled, resulting in too much gas.

Shot 34 -- Fizzle.

Shot 35 -- Diverted plasma at 1.6e20 m-2 with N2 puff from NINJA outboard
midplane. Plenum pressure is 361 torr (7.2 psi). Finally, a
decent shot again. McPherson: didn't get data. Chromex: 1000-
1400 counts. Must repeat to get McPherson data.

Shot 36 -- fizzle.

Shot 37 -- Diverted plasma at 1.6e20 m-2 with N2 puff from NINJA outboard
midplane. Detached. Disrupted at 0.95 s. McPherson: 0.5e14,
Chromex: 1500 counts.

Shot 38 -- fizzle.

Shot 39 -- fizzle.

Shot 40 -- Fiducial plasma. Good shot.

End of run.

-----------------------------------------------------------------------------------------------------------------------------------

Shot Plasma Line density Pressure change Chromex McPherson NINJA Peak influx
configuration (10**20 m-2) in NINJA (torr) (counts at 463 nm) NVII, uncalibrated Calib 10**20/s
------- ----------- ------------- -------------- ------------- --------------- ---- ----
002 div/attach 1.0 20 ms(B-side) not discernible didn't get data
003 div/attach 1.0 100 ms(B-side) 2400 didn't get data
004 lim 1.0 baseline shot, no N2 not discernible didn't get data
005 lim 1.0 20 ms(B-side) not discernible not discernible
006 lim 1.0 100 ms(B-side) 1900 0.18
007 lim 1.0 0.9 (in) 2400 0.24 2041 0.39
008 lim 1.0 1.8 (in) 9700 0.84 2046 1.24
009 lim 1.0 1.7 (in) 9800 0.80 2045 1.15
010 lim 1.0 1.3 (in) 3700 0.65-0.75 2042 0.65
011 lim 1.0 1.3 (div) 600 0.15 2043 0.82
013 lim 1.0 1.3 (out) 300 0.21 2044 0.59
014 lim 1.0 baseline shot, no N2
015 div/attach 1.0 1.3 (in) 1900 not discernible 2042 0.65
016 div/attach 1.0 2.5 (in) 4500 not discernible 2051 2.02
018 div/detach 1.0 4.5 (in) 12100 0.69 2054 4.7
019 div/detach 1.0 4.5 (out) 3000 0.99 2053 4.5

020 div/detach 1.6 baseline shot, no N2
021 lim 1.6 baseline shot, no N2
024 lim 1.6 1.2 (in) 1800 0.17 2042 0.65
028 lim 1.6 2.0 (out) 1000 0.38 2050 1.27
029 lim 1.6 2.0 (div) 1600 0.38 2049 1.70
030 div/detach 1.6 2.0 (in) 3100 0.09 2047 1.38
035 div/detach 1.6 2.5 (out) 1300 didn't get data
037 div/detach 1.6 2.5 (out) 1400 0.43 2052 1.88

Physics Operator Summaries

Entered: Jul 7 2004 04:36:56:003PM

Author: To Be Determined

Physics operator summary for 960202

EO: Bertolino / Daigle
PO: Goetz
SL: Granetz

Run 960202 was in support of Mini-Proposal #129A - Impurity screening in
limiter discharges. The primary objectives of this mini-proposal
are to measure the screening of recycling and non-recycling impurities
in limiter geometry as a function of density and poloidal injection
position and to study the SOL parameters in limiter geometry.

Plan:
fiducial
fiducial with nitrogen puff
set of limiter shots with and without nitrogen puff with
NL04=1.0e20
fiducial with NL04=2.0e20
set of limiter shots with and without nitrogen puff with
NL04=1.0e20
repeat the high density shots with argon puffing

The plan was carried out completely. Limited and diverted plasmas were
obtained that were useful for further analysis by the session
leader and his cohorts.

Some things discovered today:
1) Nitrogen puffing makes for very inconsistent startup, especially at
the end of the day. There was only one fizzle in the first 24 shots
followed by six in the last 16 shots. Waiting out the fizzle seemed
to be the correct way to handle the situation. It is also possible
that the combination of high density, nl04 > 1.5e20, with nitrogen
puffing is the culprit and not just puffing of impurities.
2) Divertor detachments were observed with the nitrogen puffing in the
divertor. If the plenum pressure was too high, the quickly
accumulating nitrogen caused a disruption.
3) The EF2's were turned off on shot 004 by a mistake in the RCUR offset
programming. The recommendation of PHYSOPs on 960130 and 960131 was
to put an offset of 3000 in RCUR for segment 2. This was done but
then the CALL button was pressed resulting in an offset of 0. Put in
the offset after pressing the CALL button. This mistaken offset in
RCUR caused CLEARIN problems which shut off the EF2's (0 current) and
when the EF2's went off, EF2_BY_EF4 forced EF4 into a bad position.
This in turn caused the plasma to move in and the current to rise until
disruption occured.
4) The high density limiter discharges today had a ZCUR of -.028 so that
the scanning probe could reach the SOL. This led to a shutting off
of EF2L on one shot (and close calls on others). Relieving the speed
of the ZCUR ramp and easing the restrictions on CLEARIN before 0.4sec
solved this problem.

Engineering, computing, and diagnostics today: Status fault on P6OUT of
the GAS system had to be forced to remove the GAS FILL FAULT.
Investigation of this limit switch problem will be done on 960205.
Some small number of CAMAC errors occured today.

Scorecard: 40 shots = 33 plasmas + 7 fizzles

Shot summary for Run 960202:

Load 960201001 with segment 4 from 951208010 loaded into segment 4
Extend waveforms to 1.1sec
IP = -500000 @ 0.1sec in segment 4
RCUR offset = 3000 in segment 4 and RCUR=0.645 in segment 4
coldstart hybrid - all matrices respond

Shot change result
____ _____ ______
1 load 960201001 for fiducial acceptable fiducial

2 see above plasma - all the way down; no
nitrogen noticed

3 (100msecx100V) @ 0.5sec on PG1 plasma - all the way down; nitrogen in

4 turn on segment 4; turn off plasma - disr. @ 1.20; trouble with IP
segment 2; disable B_SIDE_LOWER RCUR, and CLEARIN due to an offset of
0 in RCUR controller

5 RCUR offset=3000 in seg4; RCUR plasma - all the way down; everything
=0.65 in seg4 under control; good shot

6 PG1=(100Vx100msec) @ 0.5sec plasma - all the way down

7 no B_SIDE_LOWER; use div. caps. plasma - all the way down; MARFE forms
after N2 puff

8 4.5PSIA of N2 in LOWER_DIVERTOR plasma - all the way down; big MARFE;
too much nitrogen

9 smaller N2 pulse width plasma - all the way down

10 205 Torr in LOWER_DIVERTOR plasma - all the way down

11 remove RCUR jump @ 0.1sec in plasma - all the way down; early moly
seg4; puff location in PFZ rub improved

12 RCUR=0.652 at seg switch; fizzle - strong - nice null- Bz not
puff from outer divertor coming in fast enough

13 prefill puff = 11msec plasma - all the way down; still early
moly influx; slight hesitation

14 prefill puff=12msec; no N2 puff plasma - all the way down; no hesitation

15 turn on seg2 for a diverted plasma - all the way down; no nitrogen
plasma; puff from inner midplane seen
RCUr=0.648 @ 0.1sec in seg4

16 7PSIA in LOWER_DIVERTOR plasma - all the way down; nitrogen in
the divertor; none in the core

17 700 Torr N2 in LOWER_DIVERTOR plasma - disr@0.68; detaches at 0.65

18 580 Torr N2 in LOWER_DIVERTOR plasma - all the way down; detached
divertor; nitrogen in the core

19 puff from outer divertor plasma - all the way down; detached
divertor; nitrogen in the core

20 NL04=2.0e20; PG3=60V plasma - disr. @ 1.28; NL04=1.7e20

21 turn on seg4 for limited plasma plasma - disr. @ 1.42; nl04=1.5->1.9e20
NL04=2e20; PG3=70V

22 25PSIA of D in A_SIDE; plasma - disr. @ 0.44; nl04=1e20 @ 0.2s
never makes it out of crossover

23 NL04=1.6e20 and slow down ramp plasma - disr. @ 0.43; too much gas
puff N2 from inner midplane

24 20PSIA of D in A_SIDE plasma - dsir. @ 1.48; nl04=1.5e20
nitrogen in core @ 0.75

25 puff from outer divertor fizzle (weak); null o.k.; no current

26 prefill puff = 10msec (was 12) plasma - disr@0.59; EF2L turns off
@0.38; loss of IP and RCUR control

27 CLEARIN = -.04 until 0.4sec fizzle - fields o.k. - bounces once

28 prefill puff = 11msec plasma - disr.@1.49; nl04=1.6e20;
nitrogen seen in the core

29 slow down ZCUR ramp to save plasma - disr.@1.42 - nl04=1.6e20
EF2L; puff from PFZ nitrogen in core; EF2L saved

30 turn on segment 2 (divertor plasma - disr.@1.26; nl04=1.5->1.6e20
plasma); puff from inner wall

31 higher N2 pressure; twiddle plasma - disr.@0.725; detached divertor
with rampdown for 0.07sec then too much nitrogen

32 lower N2 pressure plasma - disr.@0.85; lasts for 0.2sec
after nitrogen gets in

33 puff from outer divertor plasma - disr@0.70; inadvertently
puffed from two capillaries

34 341 Torr of N2 fizzle - bouncer

35 prefill puff = 12msec plasma - disr.@1.3 - nl04=1.5->1.6e20

36 no changes fizzle (weak) - bouncer

37 prefill puff = 10msec plasma - disr. @ 0.9; vertical problem
beginning at 0.8sec

38 puff from PFZ fizzle - bounces @ .019sec

39 load segment 2 from 960202001 fizzle (strong) - looks like too much
for fiducial; prefill = 11msec gas

40 prefill puff = 9msec plasma - acceptable fiducial

Session Leader Comments

Feb 2 1996 08:28:16:190AM Robert Granetz Run plan for MP 129A, Impurity screening in limiter discharges (continued
from 951208)

Primary goal: measure screening of nitrogen in limiter plasmas at low and
high densities, and puffing from different spatial locations. Several
diverted shots and background shots will be included for baselines.

Secondary goal: measure screening of argon in limiter plasmas at high
densities. We didn't get to this last time. At the lower densities,
the ratio of divertor-to-limiter screening was about 8, which was
inexplicably higher that the factor of 2 seen a year ago.

Feb 2 1996 08:30:11:610AM Robert Granetz Shot sequence plan:

Fiducial shot (diverted, no impurity puffing)

Fiducial shot (no RF) with nitrogen puff from B-side-lower

Limiter shot, nl_04=1.0e20 m-2, no N2
" " N2 from B-side-lower
" " N2 from NINJA inboard
" " N2 from NINJA divertor
" " N2 from NINJA outboard (if time permits)

Fiducial shot (no RF) with nitrogen puff from B-side-lower, BUT at
nl_04=2.0e20 m-2.

Limiter shot, nl_04=2.0e20 m-2, no N2 (or the highest nl we can get)
" " N2 from B-side-lower
" " N2 from NINJA inboard
" " N2 from NINJA divertor
" " N2 from NINJA outboard (if time permits)

Feb 2 1996 08:32:36:140AM Robert Granetz If we get through all of this, then we'd like to repeat the high density
part of the run using argon instead of nitrogen and/or do an intermediate
density.

Feb 2 1996 08:57:18:830AM 960202001 Robert Granetz Shot 01 -- Fiducial. Good shot.

Feb 2 1996 08:57:44:280AM 960202002 Robert Granetz Shot 02 -- Diverted plasma (fiducial w/o RF) with nitrogen puff from B-side
(20 ms pulse). I can't see anything on the Chromex at 463 nm (NII).

Next shot: repeat diverted plasma, but increase N2 pulse length
to 100 ms on the B-side-lower valve.

Feb 2 1996 08:57:56:050AM 960202002 Robert Granetz Note on filling NINJA system: 2.8 psi at PLC = 149 torr on NINJA

Feb 2 1996 09:13:24:640AM 960202003 Robert Granetz Shot 03 -- Diverted plasma w/100 ms N2 puff from B-side-lower at t=0.5-0.6 s.
Small increases seen on 2pi bolo (and soft x-rays) starting at
0.55 s. Increase decays when puff ends, as expected for a non-
recycling impurity. Chromex clearly sees N2 puff from 0.55 to
about 0.80 s. Intensity peaks at 2300 counts (lambda=462.27 to
463.71 nm, NII line). Good diverted measurement. (Bruce changed
to the highest-resolution grating prior to this shot.) Brian
fired the FSP, everything normal.

Feb 2 1996 09:35:32:660AM 960202004 Robert Granetz Shot 04 -- Limiter plasma, no N2. Doesn't has a flattop, but doesn't matter,
since there's no N2 and the Chromex doesn't see anything above the
noise level (about 200 counts), as expected.

Feb 2 1996 10:07:30:540AM 960202005 Robert Granetz Shot 05 -- Limiter plasma, 20 ms N2 puff at t=0.5 s. Chromex doesn't see
much, at least after 0.5 s. Brian reports that nearly 2 cm of
scrape off wrap around to the inboard wall. He also says that the
compression ratio is nearly 100!. For the next shot, lengthen N2
puff to 100 ms.

Feb 2 1996 10:07:44:370AM 960202006 Robert Granetz Shot 06 -- Limiter plasma, 100 ms N2 puff at t=0.5-0.6 s. No 2pi bolo data.
Nothing on soft x-rays. Chromex peaks at 2000-2500 counts (similar
to diverted plasma). JT reports 0.2e14 ph/s-ster-cm2 for H-like
Lyman alpha line of Nitrogen (from McPherson)

Feb 2 1996 12:48:27:210PM 960202006 Robert Granetz JT has made a scope to look at the brightness of this line vs
time: user9:[terry.scopes]NVII.dat

Feb 2 1996 12:06:36:940PM 960202007 Robert Granetz Shot 07 -- Limiter plasma, w/NINJA inboard midplane N2 puff. (B-side disabled)
Puff time is t=0.5-0.8 s, but it shows up from about 0.7 to 1.0 s.
Chromex has nearly the same NII brightness as for 100 ms puff from
B-side valve. McPherson has about the same signal as the previous
shot as well (about 0.2e14). H-alpha (recycling light) increases
dramatically during the N2 puff. JT would like at least a factor
of 2 more signal, so for the next shot, increase NINJA plenum
pressure from 2.8 to 5.0 psi (149 to 262 torr).

Feb 2 1996 10:42:42:990AM 960202008 Robert Granetz Shot 08 -- Limiter plasma, w/higher pressure NINJA inboard midplane N2 puff.
Chromex measures 10000 counts, McPherson measures 0.9e14. This
is somewhat too much. Large perturbations in 2pi, x-rays, H-alpha,
Zeff, etc. For the next shot, shorten NINJA pulse from 0.300 to
0.200 s.

Feb 2 1996 10:51:22:780AM 960202009 Robert Granetz Shot 09 -- Limiter plasma, w/ NINJA inboard midplane N2 puff. Still too much
perturbation on the plasma. McPherson: 0.8e14, Chromex: 11000.
Next shot: lower NINJA plenum pressure from 5.0 to 4.0 psi (262 to
205 torr).

Feb 2 1996 11:05:49:540AM 960202010 Robert Granetz Shot 10 -- Limiter plasma w/NINJA inboard midplane N2 puff. Less N2, but
still perturbative. Chromex: 4500 counts, McPherson: 0.6-0.7e14.
Plume is visible on LANL fast camera. It initially goes downward,
then flips to opposite direction. Marfe shakes around alot too.

Feb 2 1996 11:17:12:840AM 960202010 Robert Granetz These NINJA plenum settings are what we will use for the rest
of the limiter plasmas (205 torr or 4.0 psi, t=0.5 to 0.7 s).

Feb 2 1996 12:01:11:810PM 960202011 Robert Granetz Shot 11 -- Limiter plasma w/NINJA N2 puff from divertor private flux zone.
Magnetics TRAQ_2 failed --> no EFIT. McPherson: 0.2e14, 100's counts
There was clearly a lot less N2 in this plasma, which is expected
since the puff came from the divertor region, not the inboard
midplane.

Feb 2 1996 11:31:51:510AM 960202012 Robert Granetz Shot 12 -- Fizzle.

Feb 2 1996 11:49:02:880AM 960202013 Robert Granetz Shot 13 -- Limiter plasma w/NINJA N2 puff from outboard side. Chromex: 300
counts, McPherson: 0.2e14

Feb 2 1996 01:59:18:370PM 960202014 Robert Granetz Shot 14 -- Limiter plasma w/o any N2 puff. Good background limiter shot.
McPherson: 0.08e14 ph/s-ster-cm2, Chromex: about 300 counts. No
perturbations on density, 2pi bolo, x-rays, but still a noticeable
H-alpha marfe.

Feb 2 1996 12:17:44:020PM 960202015 Robert Granetz Shot 15 -- Diverted plasma w/NINJA inboard midplane N2 puff, for comparison to
today's limiter plasmas. Chromex: 1200-1500 counts. No discernible
signal on the McPherson, so we'll have to repeat at higher plenum
pressure. New setting is 6.9 psi, or 349 torr.

Feb 2 1996 01:23:05:490PM 960202016 Robert Granetz Shot 16 -- Diverted plasma w/higher pressure NINJA inboard midplane N2 puff.
Chromex: 3000 counts, McPherson: still no discernible signal.
So far, the ratio of screening between limiter and (attached)
divertor plasmas is infinite! Next shot: increase plenum pressure
again. New setting is 15 psi, or 733 torr.

Feb 2 1996 12:44:04:510PM 960202017 Robert Granetz Shot 17 -- Diverted plasma w/much higher pressure NINJA inboard midplane N2
puff. Disrupted at 0.69 s! Nitrogen causes detachment, which
leads to the disruption, apparently. Obviously there was too much
nitrogen. Reduce the plenum pressure from the next shot to 11.8 psi
or 582 torr.

Feb 2 1996 01:11:30:390PM 960202018 Robert Granetz Shot 18 -- Diverted plasma w/NINJA inboard midplane N2 puff. Plenum settings
were 11.8 psi (582 torr), with pulse from t=0.5 to 0.7 s. Plasma
detaches, but doesn't disrupt. McPherson: 0.7e14, Chromex: 10500
counts. These are the same readings as the limiter plasma (shots
008, 009, and 010, 007). Ratio of screening for limiter to
detached divertor is of order unity.

Feb 2 1996 01:31:20:530PM 960202019 Robert Granetz Shot 19 -- Diverted plasma w/NINJA outboard N2 puff. Similar, or even less
screening than the previous shot. Chromex: 3000 counts,
McPherson: 1.0e14.

Feb 2 1996 01:21:49:820PM 960202020 Robert Granetz Shot 20 -- Diverted plasma at higher density, w/o N2 puff. Density only
made it to nl_04=1.7e20 m-2 at 1.0 s, then the plasma disrupted
during the rampdown. It's clearly going to take some work to get
the higher density, and I'd rather do it in limiter plasmas.

Feb 2 1996 01:36:45:400PM 960202021 Robert Granetz Shot 21 -- Limiter plasma at higher density, w/o N2 puff. Density only
makes it to nl_04=1.5-1.7e20 m-2. No nitrogen above background seen
on either the Chromex or the McPherson. Could be a good background
shot at this density. Try again with higher deuterium plenum
pressure.

Feb 2 1996 01:51:33:760PM 960202022 Robert Granetz Shot 22 -- Limiter plasma at higher density, w/o N2 puff. Minor disruptions
starting at 0.32 s, terminated at 0.44 s. Looks like we'll have
to settle for nl_04=1.6e20 m-2.

Feb 2 1996 02:01:17:290PM 960202023 Robert Granetz Shot 23 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA inboard
midplane. Minor disruptions and early termination, just like last
shot. John will lower the deuterium plenum pressure for the next
shot.

Feb 2 1996 02:20:30:670PM 960202024 Robert Granetz Shot 24 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA inboard
midplane. McPherson: 0.2e14, Chromex: 1800 counts.

Feb 2 1996 02:35:44:660PM 960202025 Robert Granetz Shot 25 -- Fizzle. It's been noticed that the results from the previous
shot are about 1/3 the levels of the corresponding shot at lower
density (shot 010). JT has requested more signal, so for the next
shot, the NINJA plenum pressure will be increased to 6.6 psi (302
torr).

Feb 2 1996 02:44:14:550PM 960202026 Robert Granetz Shot 26 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA outboard side.
NINJA plenum is at 302 torr (6.6 psi). Disrupted at 0.59 s.

Feb 2 1996 02:52:57:110PM 960202027 Robert Granetz Shot 27 -- Fizzle.

Feb 2 1996 03:06:47:240PM 960202028 Robert Granetz Shot 28 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA outboard side.
McPherson: 0.3e14, Chromex: 1000 counts.

Feb 2 1996 03:20:38:870PM 960202029 Robert Granetz Shot 29 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA private flux
zone. McPherson: 0.3-0.35e14, Chromex: 1500 counts.

Feb 2 1996 03:32:50:860PM 960202030 Robert Granetz Shot 30 -- Diverted plasma at 1.6e20 m-2 with N2puff from NINJA inboard
midplane. Plenum pressure is still 297 torr. McPherson: 0.09e14,
Chromex: 3000 counts. Signal is a little low. For next shot, raise
NINJA plenum pressure to 10.5 psi, or 527 torr.

Feb 2 1996 03:38:17:450PM 960202031 Robert Granetz Shot 31 -- Diverted plasma at 1.6e20 m-2 with N2puff from NINJA inboard
midplane. Plenum pressure is 527 torr. Disrupted at 0.72 s.
Too much nitrogen, no doubt. Plasma detached. Must reduce
NINJA plenum pressure somewhat.

Feb 2 1996 03:52:12:140PM 960202032 Robert Granetz Shot 32 -- Diverted plasma at 1.6e20 m-2 with N2puff from NINJA inboard
midplane. Plenum pressure is 440 torr (8.8 psi). Disrupted at
0.84 s, again due to too much nitrogen. Give up on this one at
move on. We already have acceptable data here from shot 030.

Feb 2 1996 04:05:35:030PM 960202033 Robert Granetz Shot 33 -- Diverted plasma at 1.6e20 m-2 with N2puff from NINJA outboard
midplane. Plenum pressure is 440 torr. Disrupted at 0.70 s.
It turns out that Bruce mistakenly had both the inboard and
outboard capillaries enabled, resulting in too much gas.

Feb 2 1996 04:12:44:480PM 960202034 Robert Granetz Shot 34 -- Fizzle.

Feb 2 1996 04:32:23:480PM 960202035 Robert Granetz Shot 35 -- Diverted plasma at 1.6e20 m-2 with N2puff from NINJA outboard
midplane. Plenum pressure is 361 torr (7.2 psi). Finally, a
decent shot again. McPherson: didn't get data. Chromex: 1000-
1400 counts. Must repeat to get McPherson data.

Feb 2 1996 04:32:42:650PM 960202036 Robert Granetz Shot 36 -- fizzle.

Feb 2 1996 04:49:27:800PM 960202037 Robert Granetz Shot 37 -- Diverted plasma at 1.6e20 m-2 with N2 puff from NINJA outboard
midplane. Detached. Disrupted at 0.95 s. McPherson: 0.5e14,
Chromex: 1500 counts.

Feb 2 1996 04:51:18:230PM 960202038 Robert Granetz Shot 38 -- fizzle.

Feb 2 1996 05:01:35:920PM 960202039 Robert Granetz Shot 39 -- fizzle.

Physics Operator Comments

Feb 2 1996 08:29:05:810AM John Goetz Run 960202:
Mini-proposal #129A - Impurity screening in limiter discharges

(1) Measure screening of recycling and non-recycling impurities
in limiter geometry
(2) Study SOL parameters, ne, Te, and flow profiles in limited
plasmas

Plan:
Fiducial
Fiducial with impurity puffing
Limiter shots with NL04=1.0e20 and various N2 puffing
Fiducial with impurity puffing and NL04=2.0e20
Limiter shots with NL04=2.0e20 and various N2 puffing

Feb 2 1996 08:31:08:080AM John Goetz Run 960202:
Mini-proposal #129A - Impurity screening in limiter discharges

Setup:
Discharge clean in deuterium from 0600-0800
B_TOP with 5PSIA of deuterium
A_SIDE with 20PSIA of deuterium
B_SIDE_LOWER with 4PSIA of nitrogen
LOWER_DIVERTOR with 2.55PSIA of nitrogen
Power supplies setup from 960201001
Enable ECE, VUV, MolyMon, PCX, TCX if status then ok
Hybrid enable B_TOP and A_SIDE for shot 001
Coldstart hybrid - all matrices respond

Feb 2 1996 08:39:58:960AM 960202001 John Goetz Shot 960202001:
Load 960201001 for a fiducial

Results:
Acceptable fiducial

Feb 2 1996 08:51:56:180AM 960202002 John Goetz Shot 960202002:
Load 960201001 with segment 4 from 951208010 in segement 4
(this is a limited segment)
Extend waveforms to 1.1sec
Add a (20msec x 100V) pulse @ 0.5sec to PG1 and hybrid enable

Results:
Plasma - All the way down
no signs of nitrogen in this plasma

Feb 2 1996 09:09:46:880AM 960202003 John Goetz Shot 960202003:
(100msec x 100V) pulse @ 0.5sec to PG1

Results:
Plasma - all the way down
Nitrogen puff shows up on x-rays and 2pi at 0.4sec

Feb 2 1996 09:37:16:260AM 960202004 John Goetz Shot 960202004:
turn on segment 4 - turn off segment 2
disable B_SIDE_LOWER

Results:
plasma - disrupts @ 1.20
plasma current rising throughout the shot to 0.9MA
RCUR is moving in throughout - turns out that the offset
was 0 not 3000

Feb 2 1996 09:49:09:290AM 960202005 John Goetz Shot 960202005:
add 3000 offset to RCUR and draw RCUR to 0.65
hybrid enable B_SIDE_LOWER with (20msecx100V) @ 0.5 on PG1

Results:
plasma - all the way down
NL04 = 1.1e20
RCUR, IP, and CLEARIN in under control this shot
(the mess up in RCUR offset caused EF2's to
turn off on shot 004 - due to CLEARIN)
nitrogen not seen

Feb 2 1996 10:01:40:840AM 960202006 John Goetz Shot 960202006:
PG1 = (100Vx100msec) @ 0.5sec

Results:
Plasma - all the way down
CAMAC error with Z_METER decoder -> no Dalpha, 2pi, etc.

Feb 2 1996 10:20:47:500AM 960202007 John Goetz Shot 960202007:
disable B_SIDE_LOWER
puff with divertor capillaries

Results:
limiter plasma - all the way down
arrival of nitrogen causes a MARFE to form and a
concommitant density rise

Feb 2 1996 10:37:48:210AM 960202008 John Goetz Shot 960202008:
increase LOWER_DIVERTOR pressure to 5.0PSIA

Results:
limited plasma - all the way down
MARFE forms (earlier than 007) and causes a 30%
rise in density (->1.3e20)
more source (Chromex) and core signals (McP)

Feb 2 1996 10:51:43:280AM 960202009 John Goetz Shot 960202009:
shorter N2 pulse width, now 0.2sec (was 0.3sec)

Results:
limited plasma - all the way down
still a large MARFE forms

Feb 2 1996 11:04:02:100AM 960202010 John Goetz Shot 960202010:
205 Torr in LOWER_DIVERTOR

Results:
limited plasma - all the way down
less N2 in the plasma, but still a MARFE formation
Reflectometer indicates that the outer SOL loses its
density and the Z_METER array becomes very peaked

Feb 2 1996 11:19:39:720AM 960202011 John Goetz Shot 960202011:
puff location is in PFZ
remove RCUR jump in seg4 at 0.1sec (there is a moly rub at
switch time)

Results:
limited plasma - all the way down
there will be no EFIT
moly rub much improved
still a MARFE formation

Feb 2 1996 11:35:03:710AM 960202012 John Goetz Shot 960202012:
puff location at outer divertor
RCUR = 0.652 @ 0.1 in seg4

Results:
fizzle (strong)
null looks good - a bouncer - Bz not coming in fast enough

Feb 2 1996 11:47:03:330AM 960202013 John Goetz Shot 960202013:
prefill puff = 11msec (was 10msec)

Results:
limited plasma - all the way down
no improvement in the early moly influx

Feb 2 1996 11:55:58:790AM 960202014 John Goetz Shot 960202014:
prefill puff = 12msec
no nitrogen puff

Results:
limited plasma - all the way down
no hesitation on the current rise
good baseline plasma for limited discharge
early moly down a bit

Feb 2 1996 12:12:19:760PM 960202015 John Goetz Shot 960202015:
turn on segment 2 for a diverted discharge (turn off segment 4)
puff nitrogen from inner midplane
RCUR = 0.648 @ 0.1sec in segement 4 (for future work)

Results:
diverted plasma - all the way down
early moly influx is very low
no nitrogen seen in core plasma

Feb 2 1996 12:36:58:900PM 960202016 John Goetz Shot 960202016:
7PSIA in LOWER_DIVERTOR

Results:
diverted plasma - all the way down
nitrogen in divertor; none seen in the core

Feb 2 1996 12:42:14:370PM 960202017 John Goetz Shot 960202017:
700 Torr of nitrogen in LOWER_DIVERTOR

Results:
diverted plasma - disrupted at 0.68
plasma detaches at 0.65
edge cooling begins at 0.61
too much nitrogen is the analysis

Feb 2 1996 12:57:51:650PM 960202018 John Goetz Shot 960202018:
580 Torr of nitrogen in LOWER_DIVERTOR

Results:
diverted plasma - all the way down
enough nitrogen to detach the divertor
nitrogen shows up in the core

Feb 2 1996 01:09:07:960PM 960202019 John Goetz Shot 960202019:
puff from outer divertor

Results:
diverted plasma - all the way down
divertor detachment
nitrogen seen in the core

Feb 2 1996 01:19:48:500PM 960202020 John Goetz Shot 960202020:
repeat program at high density
NL04 = 2e20
PG3 = 60V
no puff

Results:
plasma - disrupts @ 1.28
can't get the density out fast enough
NL04 -> 1.7e20 at end of flat-top

Feb 2 1996 01:35:28:310PM 960202021 John Goetz Shot 960202021:
turn on segment 4 for a limited discharge (turn off segment 2)
NL04 = 2.0e20 in segment 4 and PG3 = 70V in segment 4

Results:
limited plasma - disrupts @ 1.42 (0.4MA)
nl04 = 1.5 -> 1.9e20 (with a pause in the beginning)

Feb 2 1996 01:52:50:440PM 960202022 John Goetz Shot 960202022:
ramp IP down slower and ramp RCUR in faster at the end
draw NL04 to approximate the obtained nl04 (=0.8e20 @ .15sec)
top off A_SIDE to 25PSIA of deuterium

Results:
limited plasma - disrupts @ 0.44
after coming out of crossover, the plasma current drops to 0.2MA
nl04 = 1.0e20 @ 0.19sec - tried to get the density up too quickly

Feb 2 1996 02:04:46:720PM 960202023 John Goetz Shot 960202023:
ramp up NL04 more slowly - draw to NL04 = 1.6e20
puff nitrogen from inner midplane

Results:
diverted plasma - disrupts @ 0.43sec
looks very similar to shot 022
interferometer is cut-off; needs cell access

Feb 2 1996 02:21:06:900PM 960202024 John Goetz Shot 960202024:
lower pressure in A_SIDE to 20PSIA

Results:
limited plasma - disrupts @ 1.48
nl04 = 1.5e20
nitrogen comes in around 0.75sec

Feb 2 1996 02:27:20:030PM 960202025 John Goetz Shot 960202025:
puff nitrogen from outer divertor

Results:
fizzle (weak)
null looks o.k. but there was no current rise

Feb 2 1996 02:46:34:550PM 960202026 John Goetz Shot 960202026:
lower prefill puff to 10msec from 12msec

Results:
limited plasma - disrupts @ 0.59
EF2L turns off @ 0.38 and EF2U goes to -6000A later on
the EF2's are having trouble with this limiter / gas load early

Feb 2 1996 02:51:59:810PM 960202027 John Goetz Shot 960202027:
less CLEARIN early - CLEARIN = -.04 until 0.4sec

Results:
fizzle (.03MA)
null o.k.
bounces once

Feb 2 1996 03:05:21:450PM 960202028 John Goetz Shot 960202028:
prefill puff = 11msec

Results:
limited plasma - disrupts @ 1.49
nl04 = 1.6e20
nitrogen seen in core plasma

Feb 2 1996 03:15:17:700PM 960202029 John Goetz Shot 960202029:
puff nitrogen from PFZ
slow down ZCUR ramp in an attempt to save EF2L

Results:
limited plasma - disrupts @ 1.42
nl04 = 1.6e20
nitrogen in the core plasma
EF2L = -539A at minimum (so the work with CLEARIN and ZCUR
did some good)

Feb 2 1996 03:32:59:690PM 960202030 John Goetz Shot 960202030:
turn on segment 2 (divertor plasma) and turn off segment 4
NL04 = 1.6e20 in segment 2
puff nitrogen from inner midplane

Results:
diverted plasma - disrupts @ 1.26
nl04 = 1.5 -> 1.6e20
just a bit of nitrogen in the core

Feb 2 1996 03:41:05:330PM 960202031 John Goetz Shot 960202031:
528 Torr in LOWER_DIVERTOR
slow down IP ramp down and speed up RCUR ramp in

Results:
diverted plasma - disrupts @ 0.725sec
detached divertor for about 70msec then too much
nitrogen accumulation

Feb 2 1996 03:49:44:640PM 960202032 John Goetz Shot 960202032:
440 Torr in LOWER_DIVERTOR

Results:
diverted plasma - disrupts @ 0.85sec
less nitrogen -> plasma lasts longer
lasted for 0.2sec after the nitrogen comes in

Feb 2 1996 04:03:43:580PM 960202033 John Goetz Shot 960202033:
puff from outer divertor; leave pressure the same

Results:
diverted plasma - disrupts @ 0.70
puffed from both inner midplane and outer divertor - got
a lot of nitrogen into the plasma

Feb 2 1996 04:14:53:790PM 960202034 John Goetz Shot 960202034:
puff from outer divertor; pressure = 361 Torr

Results:
fizzle - bouncer
fields look o.k.

Feb 2 1996 04:32:21:380PM 960202035 John Goetz Shot 960202035:
prefill puff = 12msec

Results:
diverted plasma - disrupts @ 1.30sec
nl04 = 1.5 -> 1.6e20
nitrogen in @ 0.64sec

Feb 2 1996 04:33:32:210PM 960202036 John Goetz Shot 960202036:
no changes

Results:
fizzle (weak)
bounces

Feb 2 1996 04:46:48:450PM 960202037 John Goetz Shot 960202037:
prefill puff = 10msec

Results:
diverted plasma - disrupts @ 0.94
vertical problem beginning @ 0.8

Feb 2 1996 04:56:43:840PM 960202038 John Goetz Shot 960202038:
puff from PFZ

Results:
fizzle (weak)
bounces late (.019)

Feb 2 1996 05:09:17:410PM 960202039 John Goetz Shot 960202039:
load segment 2 from 960202001 into segment 2 for a fiducial
prefill puff = 11msec

Results:
fizzle (strong)
looks like too much gas

Feb 2 1996 05:30:14:590PM 960202040 John Goetz Shot 960202040:
prefill puff = 9msec

Results:
plasma - all the way down
acceptable fiducial

Engineering Operator Comments

Shot Time Type Status Comment

1 08:27:43:750AM Plasma Ok fiducial

2 08:41:42:360AM Plasma Ok

3 08:59:57:300AM Plasma Ok

4 09:12:35:860AM Plasma Ok

5 09:34:38:330AM Plasma Ok

6 09:48:23:230AM Plasma Ok

7 10:06:54:000AM Plasma Ok

8 10:28:01:370AM Plasma Ok

9 10:40:29:910AM Plasma Ok

10 10:53:56:160AM Plasma Ok

11 11:13:04:730AM Plasma Ok

12 11:26:16:760AM Plasma Ok

13 11:36:44:930AM Plasma Ok

14 11:48:18:510AM Plasma Ok

15 12:01:12:590PM Plasma Ok

16 12:18:27:290PM Plasma Ok

17 12:32:55:220PM Plasma Ok

18 12:48:13:840PM Plasma Ok

19 12:58:26:850PM Plasma Ok

20 01:10:38:630PM Plasma Ok

21 01:22:55:120PM Plasma Ok

22 01:41:53:570PM Plasma Ok

23 01:56:54:790PM Plasma Ok Self powered fiured C-Bar OH2U

24 02:08:56:780PM Plasma Ok

25 02:21:18:490PM Plasma Ok

26 02:35:35:270PM Plasma Ok

27 02:46:44:340PM Plasma Ok

28 02:56:56:700PM Plasma Ok

29 03:07:35:810PM Plasma Ok

30 03:19:37:870PM Plasma Ok

31 03:33:13:870PM Plasma Ok

32 03:43:26:870PM Plasma Ok

33 03:56:01:770PM Plasma Ok

34 04:08:39:430PM Plasma Ok

35 04:18:43:230PM Plasma Ok

36 04:29:37:760PM Plasma Ok

37 04:39:26:740PM Plasma Ok

38 04:49:18:210PM Plasma Ok

39 04:59:14:250PM Plasma Ok

40 05:09:24:210PM Plasma Ok

Session Leader Comments
Feb 2 1996 08:28:16:190AM		Robert Granetz	Run plan for MP 129A, Impurity screening in limiter discharges (continued from 951208) Primary goal: measure screening of nitrogen in limiter plasmas at low and high densities, and puffing from different spatial locations. Several diverted shots and background shots will be included for baselines. Secondary goal: measure screening of argon in limiter plasmas at high densities. We didn't get to this last time. At the lower densities, the ratio of divertor-to-limiter screening was about 8, which was inexplicably higher that the factor of 2 seen a year ago.
Feb 2 1996 08:30:11:610AM		Robert Granetz	Shot sequence plan: Fiducial shot (diverted, no impurity puffing) Fiducial shot (no RF) with nitrogen puff from B-side-lower Limiter shot, nl_04=1.0e20 m-2, no N2 " " N2 from B-side-lower " " N2 from NINJA inboard " " N2 from NINJA divertor " " N2 from NINJA outboard (if time permits) Fiducial shot (no RF) with nitrogen puff from B-side-lower, BUT at nl_04=2.0e20 m-2. Limiter shot, nl_04=2.0e20 m-2, no N2 (or the highest nl we can get) " " N2 from B-side-lower " " N2 from NINJA inboard " " N2 from NINJA divertor " " N2 from NINJA outboard (if time permits)
Feb 2 1996 08:32:36:140AM		Robert Granetz	If we get through all of this, then we'd like to repeat the high density part of the run using argon instead of nitrogen and/or do an intermediate density.
Feb 2 1996 08:57:18:830AM	960202001	Robert Granetz	Shot 01 -- Fiducial. Good shot.
Feb 2 1996 08:57:44:280AM	960202002	Robert Granetz	Shot 02 -- Diverted plasma (fiducial w/o RF) with nitrogen puff from B-side (20 ms pulse). I can't see anything on the Chromex at 463 nm (NII). Next shot: repeat diverted plasma, but increase N2 pulse length to 100 ms on the B-side-lower valve.
Feb 2 1996 08:57:56:050AM	960202002	Robert Granetz	Note on filling NINJA system: 2.8 psi at PLC = 149 torr on NINJA
Feb 2 1996 09:13:24:640AM	960202003	Robert Granetz	Shot 03 -- Diverted plasma w/100 ms N2 puff from B-side-lower at t=0.5-0.6 s. Small increases seen on 2pi bolo (and soft x-rays) starting at 0.55 s. Increase decays when puff ends, as expected for a non- recycling impurity. Chromex clearly sees N2 puff from 0.55 to about 0.80 s. Intensity peaks at 2300 counts (lambda=462.27 to 463.71 nm, NII line). Good diverted measurement. (Bruce changed to the highest-resolution grating prior to this shot.) Brian fired the FSP, everything normal.
Feb 2 1996 09:35:32:660AM	960202004	Robert Granetz	Shot 04 -- Limiter plasma, no N2. Doesn't has a flattop, but doesn't matter, since there's no N2 and the Chromex doesn't see anything above the noise level (about 200 counts), as expected.
Feb 2 1996 10:07:30:540AM	960202005	Robert Granetz	Shot 05 -- Limiter plasma, 20 ms N2 puff at t=0.5 s. Chromex doesn't see much, at least after 0.5 s. Brian reports that nearly 2 cm of scrape off wrap around to the inboard wall. He also says that the compression ratio is nearly 100!. For the next shot, lengthen N2 puff to 100 ms.
Feb 2 1996 10:07:44:370AM	960202006	Robert Granetz	Shot 06 -- Limiter plasma, 100 ms N2 puff at t=0.5-0.6 s. No 2pi bolo data. Nothing on soft x-rays. Chromex peaks at 2000-2500 counts (similar to diverted plasma). JT reports 0.2e14 ph/s-ster-cm2 for H-like Lyman alpha line of Nitrogen (from McPherson)
Feb 2 1996 12:48:27:210PM	960202006	Robert Granetz	JT has made a scope to look at the brightness of this line vs time: user9:[terry.scopes]NVII.dat
Feb 2 1996 12:06:36:940PM	960202007	Robert Granetz	Shot 07 -- Limiter plasma, w/NINJA inboard midplane N2 puff. (B-side disabled) Puff time is t=0.5-0.8 s, but it shows up from about 0.7 to 1.0 s. Chromex has nearly the same NII brightness as for 100 ms puff from B-side valve. McPherson has about the same signal as the previous shot as well (about 0.2e14). H-alpha (recycling light) increases dramatically during the N2 puff. JT would like at least a factor of 2 more signal, so for the next shot, increase NINJA plenum pressure from 2.8 to 5.0 psi (149 to 262 torr).
Feb 2 1996 10:42:42:990AM	960202008	Robert Granetz	Shot 08 -- Limiter plasma, w/higher pressure NINJA inboard midplane N2 puff. Chromex measures 10000 counts, McPherson measures 0.9e14. This is somewhat too much. Large perturbations in 2pi, x-rays, H-alpha, Zeff, etc. For the next shot, shorten NINJA pulse from 0.300 to 0.200 s.
Feb 2 1996 10:51:22:780AM	960202009	Robert Granetz	Shot 09 -- Limiter plasma, w/ NINJA inboard midplane N2 puff. Still too much perturbation on the plasma. McPherson: 0.8e14, Chromex: 11000. Next shot: lower NINJA plenum pressure from 5.0 to 4.0 psi (262 to 205 torr).
Feb 2 1996 11:05:49:540AM	960202010	Robert Granetz	Shot 10 -- Limiter plasma w/NINJA inboard midplane N2 puff. Less N2, but still perturbative. Chromex: 4500 counts, McPherson: 0.6-0.7e14. Plume is visible on LANL fast camera. It initially goes downward, then flips to opposite direction. Marfe shakes around alot too.
Feb 2 1996 11:17:12:840AM	960202010	Robert Granetz	These NINJA plenum settings are what we will use for the rest of the limiter plasmas (205 torr or 4.0 psi, t=0.5 to 0.7 s).
Feb 2 1996 12:01:11:810PM	960202011	Robert Granetz	Shot 11 -- Limiter plasma w/NINJA N2 puff from divertor private flux zone. Magnetics TRAQ_2 failed --> no EFIT. McPherson: 0.2e14, 100's counts There was clearly a lot less N2 in this plasma, which is expected since the puff came from the divertor region, not the inboard midplane.
Feb 2 1996 11:31:51:510AM	960202012	Robert Granetz	Shot 12 -- Fizzle.
Feb 2 1996 11:49:02:880AM	960202013	Robert Granetz	Shot 13 -- Limiter plasma w/NINJA N2 puff from outboard side. Chromex: 300 counts, McPherson: 0.2e14
Feb 2 1996 01:59:18:370PM	960202014	Robert Granetz	Shot 14 -- Limiter plasma w/o any N2 puff. Good background limiter shot. McPherson: 0.08e14 ph/s-ster-cm2, Chromex: about 300 counts. No perturbations on density, 2pi bolo, x-rays, but still a noticeable H-alpha marfe.
Feb 2 1996 12:17:44:020PM	960202015	Robert Granetz	Shot 15 -- Diverted plasma w/NINJA inboard midplane N2 puff, for comparison to today's limiter plasmas. Chromex: 1200-1500 counts. No discernible signal on the McPherson, so we'll have to repeat at higher plenum pressure. New setting is 6.9 psi, or 349 torr.
Feb 2 1996 01:23:05:490PM	960202016	Robert Granetz	Shot 16 -- Diverted plasma w/higher pressure NINJA inboard midplane N2 puff. Chromex: 3000 counts, McPherson: still no discernible signal. So far, the ratio of screening between limiter and (attached) divertor plasmas is infinite! Next shot: increase plenum pressure again. New setting is 15 psi, or 733 torr.
Feb 2 1996 12:44:04:510PM	960202017	Robert Granetz	Shot 17 -- Diverted plasma w/much higher pressure NINJA inboard midplane N2 puff. Disrupted at 0.69 s! Nitrogen causes detachment, which leads to the disruption, apparently. Obviously there was too much nitrogen. Reduce the plenum pressure from the next shot to 11.8 psi or 582 torr.
Feb 2 1996 01:11:30:390PM	960202018	Robert Granetz	Shot 18 -- Diverted plasma w/NINJA inboard midplane N2 puff. Plenum settings were 11.8 psi (582 torr), with pulse from t=0.5 to 0.7 s. Plasma detaches, but doesn't disrupt. McPherson: 0.7e14, Chromex: 10500 counts. These are the same readings as the limiter plasma (shots 008, 009, and 010, 007). Ratio of screening for limiter to detached divertor is of order unity.
Feb 2 1996 01:31:20:530PM	960202019	Robert Granetz	Shot 19 -- Diverted plasma w/NINJA outboard N2 puff. Similar, or even less screening than the previous shot. Chromex: 3000 counts, McPherson: 1.0e14.
Feb 2 1996 01:21:49:820PM	960202020	Robert Granetz	Shot 20 -- Diverted plasma at higher density, w/o N2 puff. Density only made it to nl_04=1.7e20 m-2 at 1.0 s, then the plasma disrupted during the rampdown. It's clearly going to take some work to get the higher density, and I'd rather do it in limiter plasmas.
Feb 2 1996 01:36:45:400PM	960202021	Robert Granetz	Shot 21 -- Limiter plasma at higher density, w/o N2 puff. Density only makes it to nl_04=1.5-1.7e20 m-2. No nitrogen above background seen on either the Chromex or the McPherson. Could be a good background shot at this density. Try again with higher deuterium plenum pressure.
Feb 2 1996 01:51:33:760PM	960202022	Robert Granetz	Shot 22 -- Limiter plasma at higher density, w/o N2 puff. Minor disruptions starting at 0.32 s, terminated at 0.44 s. Looks like we'll have to settle for nl_04=1.6e20 m-2.
Feb 2 1996 02:01:17:290PM	960202023	Robert Granetz	Shot 23 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA inboard midplane. Minor disruptions and early termination, just like last shot. John will lower the deuterium plenum pressure for the next shot.
Feb 2 1996 02:20:30:670PM	960202024	Robert Granetz	Shot 24 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA inboard midplane. McPherson: 0.2e14, Chromex: 1800 counts.
Feb 2 1996 02:35:44:660PM	960202025	Robert Granetz	Shot 25 -- Fizzle. It's been noticed that the results from the previous shot are about 1/3 the levels of the corresponding shot at lower density (shot 010). JT has requested more signal, so for the next shot, the NINJA plenum pressure will be increased to 6.6 psi (302 torr).
Feb 2 1996 02:44:14:550PM	960202026	Robert Granetz	Shot 26 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA outboard side. NINJA plenum is at 302 torr (6.6 psi). Disrupted at 0.59 s.
Feb 2 1996 02:52:57:110PM	960202027	Robert Granetz	Shot 27 -- Fizzle.
Feb 2 1996 03:06:47:240PM	960202028	Robert Granetz	Shot 28 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA outboard side. McPherson: 0.3e14, Chromex: 1000 counts.
Feb 2 1996 03:20:38:870PM	960202029	Robert Granetz	Shot 29 -- Limiter plasma at 1.6e20 m-2 with N2 puff from NINJA private flux zone. McPherson: 0.3-0.35e14, Chromex: 1500 counts.
Feb 2 1996 03:32:50:860PM	960202030	Robert Granetz	Shot 30 -- Diverted plasma at 1.6e20 m-2 with N2puff from NINJA inboard midplane. Plenum pressure is still 297 torr. McPherson: 0.09e14, Chromex: 3000 counts. Signal is a little low. For next shot, raise NINJA plenum pressure to 10.5 psi, or 527 torr.
Feb 2 1996 03:38:17:450PM	960202031	Robert Granetz	Shot 31 -- Diverted plasma at 1.6e20 m-2 with N2puff from NINJA inboard midplane. Plenum pressure is 527 torr. Disrupted at 0.72 s. Too much nitrogen, no doubt. Plasma detached. Must reduce NINJA plenum pressure somewhat.
Feb 2 1996 03:52:12:140PM	960202032	Robert Granetz	Shot 32 -- Diverted plasma at 1.6e20 m-2 with N2puff from NINJA inboard midplane. Plenum pressure is 440 torr (8.8 psi). Disrupted at 0.84 s, again due to too much nitrogen. Give up on this one at move on. We already have acceptable data here from shot 030.
Feb 2 1996 04:05:35:030PM	960202033	Robert Granetz	Shot 33 -- Diverted plasma at 1.6e20 m-2 with N2puff from NINJA outboard midplane. Plenum pressure is 440 torr. Disrupted at 0.70 s. It turns out that Bruce mistakenly had both the inboard and outboard capillaries enabled, resulting in too much gas.
Feb 2 1996 04:12:44:480PM	960202034	Robert Granetz	Shot 34 -- Fizzle.
Feb 2 1996 04:32:23:480PM	960202035	Robert Granetz	Shot 35 -- Diverted plasma at 1.6e20 m-2 with N2puff from NINJA outboard midplane. Plenum pressure is 361 torr (7.2 psi). Finally, a decent shot again. McPherson: didn't get data. Chromex: 1000- 1400 counts. Must repeat to get McPherson data.
Feb 2 1996 04:32:42:650PM	960202036	Robert Granetz	Shot 36 -- fizzle.
Feb 2 1996 04:49:27:800PM	960202037	Robert Granetz	Shot 37 -- Diverted plasma at 1.6e20 m-2 with N2 puff from NINJA outboard midplane. Detached. Disrupted at 0.95 s. McPherson: 0.5e14, Chromex: 1500 counts.
Feb 2 1996 04:51:18:230PM	960202038	Robert Granetz	Shot 38 -- fizzle.
Feb 2 1996 05:01:35:920PM	960202039	Robert Granetz	Shot 39 -- fizzle.

Physics Operator Comments
Feb 2 1996 08:29:05:810AM		John Goetz	Run 960202: Mini-proposal #129A - Impurity screening in limiter discharges (1) Measure screening of recycling and non-recycling impurities in limiter geometry (2) Study SOL parameters, ne, Te, and flow profiles in limited plasmas Plan: Fiducial Fiducial with impurity puffing Limiter shots with NL04=1.0e20 and various N2 puffing Fiducial with impurity puffing and NL04=2.0e20 Limiter shots with NL04=2.0e20 and various N2 puffing
Feb 2 1996 08:31:08:080AM		John Goetz	Run 960202: Mini-proposal #129A - Impurity screening in limiter discharges Setup: Discharge clean in deuterium from 0600-0800 B_TOP with 5PSIA of deuterium A_SIDE with 20PSIA of deuterium B_SIDE_LOWER with 4PSIA of nitrogen LOWER_DIVERTOR with 2.55PSIA of nitrogen Power supplies setup from 960201001 Enable ECE, VUV, MolyMon, PCX, TCX if status then ok Hybrid enable B_TOP and A_SIDE for shot 001 Coldstart hybrid - all matrices respond
Feb 2 1996 08:39:58:960AM	960202001	John Goetz	Shot 960202001: Load 960201001 for a fiducial Results: Acceptable fiducial
Feb 2 1996 08:51:56:180AM	960202002	John Goetz	Shot 960202002: Load 960201001 with segment 4 from 951208010 in segement 4 (this is a limited segment) Extend waveforms to 1.1sec Add a (20msec x 100V) pulse @ 0.5sec to PG1 and hybrid enable Results: Plasma - All the way down no signs of nitrogen in this plasma
Feb 2 1996 09:09:46:880AM	960202003	John Goetz	Shot 960202003: (100msec x 100V) pulse @ 0.5sec to PG1 Results: Plasma - all the way down Nitrogen puff shows up on x-rays and 2pi at 0.4sec
Feb 2 1996 09:37:16:260AM	960202004	John Goetz	Shot 960202004: turn on segment 4 - turn off segment 2 disable B_SIDE_LOWER Results: plasma - disrupts @ 1.20 plasma current rising throughout the shot to 0.9MA RCUR is moving in throughout - turns out that the offset was 0 not 3000
Feb 2 1996 09:49:09:290AM	960202005	John Goetz	Shot 960202005: add 3000 offset to RCUR and draw RCUR to 0.65 hybrid enable B_SIDE_LOWER with (20msecx100V) @ 0.5 on PG1 Results: plasma - all the way down NL04 = 1.1e20 RCUR, IP, and CLEARIN in under control this shot (the mess up in RCUR offset caused EF2's to turn off on shot 004 - due to CLEARIN) nitrogen not seen
Feb 2 1996 10:01:40:840AM	960202006	John Goetz	Shot 960202006: PG1 = (100Vx100msec) @ 0.5sec Results: Plasma - all the way down CAMAC error with Z_METER decoder -> no Dalpha, 2pi, etc.
Feb 2 1996 10:20:47:500AM	960202007	John Goetz	Shot 960202007: disable B_SIDE_LOWER puff with divertor capillaries Results: limiter plasma - all the way down arrival of nitrogen causes a MARFE to form and a concommitant density rise
Feb 2 1996 10:37:48:210AM	960202008	John Goetz	Shot 960202008: increase LOWER_DIVERTOR pressure to 5.0PSIA Results: limited plasma - all the way down MARFE forms (earlier than 007) and causes a 30% rise in density (->1.3e20) more source (Chromex) and core signals (McP)
Feb 2 1996 10:51:43:280AM	960202009	John Goetz	Shot 960202009: shorter N2 pulse width, now 0.2sec (was 0.3sec) Results: limited plasma - all the way down still a large MARFE forms
Feb 2 1996 11:04:02:100AM	960202010	John Goetz	Shot 960202010: 205 Torr in LOWER_DIVERTOR Results: limited plasma - all the way down less N2 in the plasma, but still a MARFE formation Reflectometer indicates that the outer SOL loses its density and the Z_METER array becomes very peaked
Feb 2 1996 11:19:39:720AM	960202011	John Goetz	Shot 960202011: puff location is in PFZ remove RCUR jump in seg4 at 0.1sec (there is a moly rub at switch time) Results: limited plasma - all the way down there will be no EFIT moly rub much improved still a MARFE formation
Feb 2 1996 11:35:03:710AM	960202012	John Goetz	Shot 960202012: puff location at outer divertor RCUR = 0.652 @ 0.1 in seg4 Results: fizzle (strong) null looks good - a bouncer - Bz not coming in fast enough
Feb 2 1996 11:47:03:330AM	960202013	John Goetz	Shot 960202013: prefill puff = 11msec (was 10msec) Results: limited plasma - all the way down no improvement in the early moly influx
Feb 2 1996 11:55:58:790AM	960202014	John Goetz	Shot 960202014: prefill puff = 12msec no nitrogen puff Results: limited plasma - all the way down no hesitation on the current rise good baseline plasma for limited discharge early moly down a bit
Feb 2 1996 12:12:19:760PM	960202015	John Goetz	Shot 960202015: turn on segment 2 for a diverted discharge (turn off segment 4) puff nitrogen from inner midplane RCUR = 0.648 @ 0.1sec in segement 4 (for future work) Results: diverted plasma - all the way down early moly influx is very low no nitrogen seen in core plasma
Feb 2 1996 12:36:58:900PM	960202016	John Goetz	Shot 960202016: 7PSIA in LOWER_DIVERTOR Results: diverted plasma - all the way down nitrogen in divertor; none seen in the core
Feb 2 1996 12:42:14:370PM	960202017	John Goetz	Shot 960202017: 700 Torr of nitrogen in LOWER_DIVERTOR Results: diverted plasma - disrupted at 0.68 plasma detaches at 0.65 edge cooling begins at 0.61 too much nitrogen is the analysis
Feb 2 1996 12:57:51:650PM	960202018	John Goetz	Shot 960202018: 580 Torr of nitrogen in LOWER_DIVERTOR Results: diverted plasma - all the way down enough nitrogen to detach the divertor nitrogen shows up in the core
Feb 2 1996 01:09:07:960PM	960202019	John Goetz	Shot 960202019: puff from outer divertor Results: diverted plasma - all the way down divertor detachment nitrogen seen in the core
Feb 2 1996 01:19:48:500PM	960202020	John Goetz	Shot 960202020: repeat program at high density NL04 = 2e20 PG3 = 60V no puff Results: plasma - disrupts @ 1.28 can't get the density out fast enough NL04 -> 1.7e20 at end of flat-top
Feb 2 1996 01:35:28:310PM	960202021	John Goetz	Shot 960202021: turn on segment 4 for a limited discharge (turn off segment 2) NL04 = 2.0e20 in segment 4 and PG3 = 70V in segment 4 Results: limited plasma - disrupts @ 1.42 (0.4MA) nl04 = 1.5 -> 1.9e20 (with a pause in the beginning)
Feb 2 1996 01:52:50:440PM	960202022	John Goetz	Shot 960202022: ramp IP down slower and ramp RCUR in faster at the end draw NL04 to approximate the obtained nl04 (=0.8e20 @ .15sec) top off A_SIDE to 25PSIA of deuterium Results: limited plasma - disrupts @ 0.44 after coming out of crossover, the plasma current drops to 0.2MA nl04 = 1.0e20 @ 0.19sec - tried to get the density up too quickly
Feb 2 1996 02:04:46:720PM	960202023	John Goetz	Shot 960202023: ramp up NL04 more slowly - draw to NL04 = 1.6e20 puff nitrogen from inner midplane Results: diverted plasma - disrupts @ 0.43sec looks very similar to shot 022 interferometer is cut-off; needs cell access
Feb 2 1996 02:21:06:900PM	960202024	John Goetz	Shot 960202024: lower pressure in A_SIDE to 20PSIA Results: limited plasma - disrupts @ 1.48 nl04 = 1.5e20 nitrogen comes in around 0.75sec
Feb 2 1996 02:27:20:030PM	960202025	John Goetz	Shot 960202025: puff nitrogen from outer divertor Results: fizzle (weak) null looks o.k. but there was no current rise
Feb 2 1996 02:46:34:550PM	960202026	John Goetz	Shot 960202026: lower prefill puff to 10msec from 12msec Results: limited plasma - disrupts @ 0.59 EF2L turns off @ 0.38 and EF2U goes to -6000A later on the EF2's are having trouble with this limiter / gas load early
Feb 2 1996 02:51:59:810PM	960202027	John Goetz	Shot 960202027: less CLEARIN early - CLEARIN = -.04 until 0.4sec Results: fizzle (.03MA) null o.k. bounces once
Feb 2 1996 03:05:21:450PM	960202028	John Goetz	Shot 960202028: prefill puff = 11msec Results: limited plasma - disrupts @ 1.49 nl04 = 1.6e20 nitrogen seen in core plasma
Feb 2 1996 03:15:17:700PM	960202029	John Goetz	Shot 960202029: puff nitrogen from PFZ slow down ZCUR ramp in an attempt to save EF2L Results: limited plasma - disrupts @ 1.42 nl04 = 1.6e20 nitrogen in the core plasma EF2L = -539A at minimum (so the work with CLEARIN and ZCUR did some good)
Feb 2 1996 03:32:59:690PM	960202030	John Goetz	Shot 960202030: turn on segment 2 (divertor plasma) and turn off segment 4 NL04 = 1.6e20 in segment 2 puff nitrogen from inner midplane Results: diverted plasma - disrupts @ 1.26 nl04 = 1.5 -> 1.6e20 just a bit of nitrogen in the core
Feb 2 1996 03:41:05:330PM	960202031	John Goetz	Shot 960202031: 528 Torr in LOWER_DIVERTOR slow down IP ramp down and speed up RCUR ramp in Results: diverted plasma - disrupts @ 0.725sec detached divertor for about 70msec then too much nitrogen accumulation
Feb 2 1996 03:49:44:640PM	960202032	John Goetz	Shot 960202032: 440 Torr in LOWER_DIVERTOR Results: diverted plasma - disrupts @ 0.85sec less nitrogen -> plasma lasts longer lasted for 0.2sec after the nitrogen comes in
Feb 2 1996 04:03:43:580PM	960202033	John Goetz	Shot 960202033: puff from outer divertor; leave pressure the same Results: diverted plasma - disrupts @ 0.70 puffed from both inner midplane and outer divertor - got a lot of nitrogen into the plasma
Feb 2 1996 04:14:53:790PM	960202034	John Goetz	Shot 960202034: puff from outer divertor; pressure = 361 Torr Results: fizzle - bouncer fields look o.k.
Feb 2 1996 04:32:21:380PM	960202035	John Goetz	Shot 960202035: prefill puff = 12msec Results: diverted plasma - disrupts @ 1.30sec nl04 = 1.5 -> 1.6e20 nitrogen in @ 0.64sec
Feb 2 1996 04:33:32:210PM	960202036	John Goetz	Shot 960202036: no changes Results: fizzle (weak) bounces
Feb 2 1996 04:46:48:450PM	960202037	John Goetz	Shot 960202037: prefill puff = 10msec Results: diverted plasma - disrupts @ 0.94 vertical problem beginning @ 0.8
Feb 2 1996 04:56:43:840PM	960202038	John Goetz	Shot 960202038: puff from PFZ Results: fizzle (weak) bounces late (.019)
Feb 2 1996 05:09:17:410PM	960202039	John Goetz	Shot 960202039: load segment 2 from 960202001 into segment 2 for a fiducial prefill puff = 11msec Results: fizzle (strong) looks like too much gas
Feb 2 1996 05:30:14:590PM	960202040	John Goetz	Shot 960202040: prefill puff = 9msec Results: plasma - all the way down acceptable fiducial

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:27:43:750AM	Plasma	Ok	fiducial
2	08:41:42:360AM	Plasma	Ok
3	08:59:57:300AM	Plasma	Ok
4	09:12:35:860AM	Plasma	Ok
5	09:34:38:330AM	Plasma	Ok
6	09:48:23:230AM	Plasma	Ok
7	10:06:54:000AM	Plasma	Ok
8	10:28:01:370AM	Plasma	Ok
9	10:40:29:910AM	Plasma	Ok
10	10:53:56:160AM	Plasma	Ok
11	11:13:04:730AM	Plasma	Ok
12	11:26:16:760AM	Plasma	Ok
13	11:36:44:930AM	Plasma	Ok
14	11:48:18:510AM	Plasma	Ok
15	12:01:12:590PM	Plasma	Ok
16	12:18:27:290PM	Plasma	Ok
17	12:32:55:220PM	Plasma	Ok
18	12:48:13:840PM	Plasma	Ok
19	12:58:26:850PM	Plasma	Ok
20	01:10:38:630PM	Plasma	Ok
21	01:22:55:120PM	Plasma	Ok
22	01:41:53:570PM	Plasma	Ok
23	01:56:54:790PM	Plasma	Ok	Self powered fiured C-Bar OH2U
24	02:08:56:780PM	Plasma	Ok
25	02:21:18:490PM	Plasma	Ok
26	02:35:35:270PM	Plasma	Ok
27	02:46:44:340PM	Plasma	Ok
28	02:56:56:700PM	Plasma	Ok
29	03:07:35:810PM	Plasma	Ok
30	03:19:37:870PM	Plasma	Ok
31	03:33:13:870PM	Plasma	Ok
32	03:43:26:870PM	Plasma	Ok
33	03:56:01:770PM	Plasma	Ok
34	04:08:39:430PM	Plasma	Ok
35	04:18:43:230PM	Plasma	Ok
36	04:29:37:760PM	Plasma	Ok
37	04:39:26:740PM	Plasma	Ok
38	04:49:18:210PM	Plasma	Ok
39	04:59:14:250PM	Plasma	Ok
40	05:09:24:210PM	Plasma	Ok