Alcator C-Mod Run 960112 Information

Miniproposals

Miniproposal: 113

Date Filed: 4/13/1995

Title: Impurity Puffing to Induce the Detached Divertor Condition in

First Author: Steve Golovato

Session Leader: Gary McCracken (shots 1-39)

Operators
Session leader(s):	Gary McCracken
Physics operator(s):	John Goetz
Engineering operator(s):	Vinny Bertolino

Engineering Operator Run Comment
MP 133

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:14:913PM

Author: To Be Determined

Run Summary 960112: MP 113 Boronization of Alcator C_Mod
S/L G McCracken
P/O J Goetz
E/O V Bertolino
MP 113 Boronization of Alcator C_Mod

Boronization of C-Mod was carried out on Jan 7, 9,10 using ECDC to decompose
the borane gas in the vessel. The total number of boron atoms injected was ~
2e23, corresponding to a layer 100 nm thick if it were uniformly distributed.
Observation through windows in the vessel indicated that it had gone about 90
degrees toroidally each way around the vessel from the injection port.

The object of this run was to repeat the 5 fiducial shots similar to
the pre-boronization run 950105 and then do a density and an RF power scan.
These objectives were all achieved although there was difficulty getting to
high density and the power scan was limited to a maximum of 1.4 MW.
The boronization seems to have reduced the Mo in ohmic shots to
background level. Observations with the McPherson indicate that the Mo monitor
is seeing only background. Distinctive Mo peaks are there during RF but they
are down almost an order of magnitude , from a brightness of ~8e15
photons/ster/cm2/s before boronization to a value of 1.5e15 photons/ster/cm2/s
after boronization. The Mo level continued to fall slightly during the run to
~8e14 photons/ster/cm2/s. A strong boron II line at 345.1 nm was seen on the
Chromex spectrometer and did not change brightness significantly throughout the
run. The spatial distribution of the boron (BII, 411 nm) seemed peaked at the
inner nose like all the other impurities we have looked at. The CII monitor
was down but by less than a factor 2. Joe Snipes reports that the O I monitor
is down almost a factor of 2. The fraction of the total power radiated has
fallen significantly, to less than 30%.
We completed 8 fiducial shots (shots 003 to 009,23,35,37) and a density
scan from nl04=5e19 to1.9e20 (shots 011 to 033). We had difficulty coupling
the RF to the plasma both at low density and at high density but eventually
achieved reasonable conditions. Over most of the density range we got very
good H-modes, the quality decreasing as we went to higher density . It was
found hard to couple the RF power at high density. We had H factors up to 1.5
the highest yet achieved with RF in C-Mod. The value went briefly as high as
1.8 at the start of heating However at 5.5e19 with 1MW ICRH there was no
H-mode, establishing the lower limit of the H-mode. At slightly higher density
good H-modes were obtained.
The shots 34 thru 37 give us a rather good RF power scan, 0.0, 0.3, 0.8
1.0 and 1.4 MW. The power was constant from 0.7 to 1.0 s establishing steady
state conditions.This may provide some interesting scaling of edge parameters .
Brian reported that the surface sample removed from A-port after
boronization had an insulating coating characteristic of boron. This is
consistent with changes of behaviour of the Langmuir probes. Much lower noise
levels were observed on the scanning probes during ICRH.

Shot summary:
001 Ohmic heating test shot
002 First attempt at fiducial shot. Good shot but the density was low
throughout the shot. nlo4 only gets up to 0.9e20 at 0.9 s. The RF and Mo
monitor were not on. The CII (514.5 nm) was down by a factor of 2 or 3 from
the pre-boronization shots in 950105.
003 First fiducial nl04=1e20 at 0.6 s. When the RF came on we had an
H-mode and the density rose to 1.5e20. The CII level is about the same as
the previous shot. However the Mo monitor is much lower than preboronization.
The brightness is ~1.5e15 during RF. Steve Golovato reports an H factor of 1.5
004 : Second fiducial, similar to 003. When the RF came on it went into
H-mode immediately and the density rose to 1.7e20. The CII is now increasing
slightly when the RF comes on. The Mo monitor brightness increased during the
RF pulse to 1.4e15. Chromex shows strong BII line at 345.1 nm and a weaker
line at 332.3. It comes up early in the shot and peaks at about 0.5 s
005 fizzle
006 Third fiducial. Similar density trace to shot 4. Mo still low but
there was an injection at 0.92 s. H-mode at 0.77 s. Total radiated power Prad
bolo is low at ~300 kW during ohmic phase,
007 Fizzle
008 Fourth fiducial.. Similar to shot 006. Mo brightness going down
further. H-factor going up. It was 1.8 in shot 006
009 Fifth fiducial. Again a similar to shot 006.
010 Fizzle

Start of density scan
011 Good shot. nl04= 1.15e20 ; Mo 0.97e15 during RF, down a little,
possibly because the density is up. H factor down to 1.5 CII up to 0.026
012 Fizzle
013 Fizzle
014 Good shot. nlo4=1.15e20, similar to shot 011.
015 Fizzle
016 Good shot. Density increased to 1.47 at 0.8 s. No RF ; wasn't tuned
for higher density. Very good detachment at 0.62 s. Threshold density nl04
was 1.26e20 which is a little higher than pre boronization. Te at target goes
down to 1.5 eV
017 Fizzle
018 Good shot, nlo4=1.5e20. but no RF; like shot 016
019 Fizzle
020 Fizzle
021 Good shot but no RF. Density =1.73 at 0.9 s. Still detaching early
with very low target temperatures ~ 2 eV. Try to get some RF on the next shot.
022 Fizzle.
023 Fiducial shot ; Good shot but RF power a little low. Obtained a good
H-mode , very similar to shots 8 and 9. Mo monitor and Prad both a little
lower than earlier. Recovered the good H factor again. It increases to 1.8
briefly and then falls monotonically.
024 Fizzle
025 Good shot with RF, but power a little low. nl04=1.0e20. H-mode
026 Good shot with RF, power= 1.1 MW from 0.75 s to 1.0 s. nl04= 0.9e20.
H-mode looks good, although the Halpha signal looks funny. Target tempeatures
are getting quite high . Up to ~40 eV at the separatrix on probe 2. 1.5 MW
getting into the SOL
027 Good shot with RF, power 1.1 MW from 0.75 s to 1.0 s. nl04= 0.8e20
increasing to 1.5 during H-mode. H-mode looks good, starting at 0.75 s and
lasting all the RF pulse. Target temperatures are again high.
028 Fizzle
029 Fizzle
030 Good shot. nlo4 =0.6e20. RF initially 1.5 MW at 0.7 s but it tripped
out at 0.78 s. No H mode Try again at 0.6e20
031 Good shot. nlo4 =0.67e20. Still have not got RF to stay on
continuously. However when it does come on we get brief H-modes
032 Good shot. nlo4 =0.67e20. RF =1 MW from 0.7 to 1.0 s, but there were 2
interrupts which spoiled the H modes. Mo monitor went up 1e15 during RF
033 Good shot. nl04=0.55e20. 1 MW RF power steady from 0.7 to 1.0 s. NO H
MODE. We seem to be below the density required for H modes. Mo level stays
low.
034 Good shot. nl04=1e20 Reduced RF power to 0.31 MW . H-mode starts at
0.82 s and remains to the end of the RF pulse even though the RF power falls to
0.25 MW. Mo increases to 0.75e15
035 Good shot. nl04=1e20 RF power 1 MW from 0.7 to 1.0s. H-mode
starts at 0.73 s and remains to the end of the RF pulse. Very good steady
state conditions with lower Mo than in earlier fiducial shots and total
radiation being down to ~28%.
036 Good shot. RF power is 1.44 MW . Radiated power down to 26%. Mo
level still below 1e15

This completes the RF power scan.
037 Fiducial shot. For this shot the Mo monitor gives a Mo level during the
RF significantly lower (~0.8e15) than in the earlier fiducial shots,
#003-009, (1.2 to 1.6e15) and much lower than before boronization (6 to 8e15)
038 Fizzle
039 Attempt a PEP discharge using a Li pellet. Good shot but no pellet.
Constant 1 MW RF power from 0.75 to 1.0 s. Low Mo and low Prad.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:55:753PM

Author: To Be Determined

Physics operator summary for 960112

EO: Bertolino
PO: Goetz
SL: McCracken

Run 960112 was in support of Mini-Proposal #133 - Boronization of Alcator
C-Mod. The goal of this run is to implement ECDC boronization of
C-Mod and make a preliminary evaluation of its utility with respect
to wall conditioning, impurity influx, recycling, divertor dynamics
and energy confinement enhancement in H-mode and PEP-mode.

Program for this run:
- Learn how to run with boronized walls
- Run a set of fiducials (5)
- Density scan
- ion cyclotron range of frequencies power scan
- PEP studies with lithium pellets

A very successful and exciting run. See the session leader's summary for a
detailed report on this program.

Some things discovered today:
1) Startup was quite iffy today. An alternating pattern of fizzles and
plasmas was the outcome for most of the day. Only late in the run,
shots 030 - 037, was a string of plasmas put together. Most fizzles
were very weak, less than 20kA. There were two strong fizzles, ~ 40kA,
and they preceded the string.
2) The cause of the fizzles is not readily apparent. The Br offset was
changed in the range of 6.4 to 7.5mT. IC_EF4 was changed by 20A and
V_OH1 was increased by 40V to change the ramp of Bz. The prefill puff
duration was increased and then decreased, with a final value of
14msec. None of these changes seemed to correlate with the reduction
in fizzle frequency, except for the OH1 voltage change. The prefill
puff was difficult to diagnose as the ratiomatic data were not being
stored on most shots due to CAMAC errors.
3) A working theory of fizzles based on the partial pressure of mass 32
(diborane) was validated for most of the day, but eventually was tossed
aside. The fizzle/plasma pattern may just be due to working with
boronized walls.
4) Density control was difficult today. The walls, or whatever reservoir,
seemed to have much more control over the density than the gas valve.
A second valve was necessary to reach the highest density requested.
5) The machine ran very well today when it ran. All plasmas with NL04
less than or equal to 1e20 ramped down to less than 50kA.

Engineering, computing, and diagnostics today: Engineering tests were
performed on shot 001 to check the OH coax resistances. Some CAMAC
errors today, mostly on GKA5:.

Scorecard: 39 shots = 24 plasmas + 14 fizzles + 1 test

Shot summary for Run 960112:

Load 960105010 - no changes
coldstart hybrid - all matrices respond

Shot change result
____ _____ ______
1 eng. test shot for OH resistances o.k.

2 see above plasma - all the way down - density
very low

3 load reasonable waveform into plasma - all the way down - density
PG3 better

4 NL04 to max @ 0.5sec plasma - all the way down - H-mode @ .78

5 no changes fizzle - weak one - null looks fine

6 no changes plasma - all the way down - good
current rise

7 no changes fizzle - weak - null o.k. - Br too small

8 Br_0 offset = .0072 plasma - all the way down - Mo at
crossover

9 no changes plasma - all the way down - hesitation

10 NL04=1.3e20; more PG3 volts fizzle - hit something

11 Br_0 offset = .0075 plasma - all the way down; NL04=1.15e20

12 more PG3 volts; ZXL=-.02 fizzle (weak); not enough Bz early?

13 IC_EF4=-1140A; add 2msec to fizzle; too much Br?
prefill

14 remove 4msec from prefill puff; plasma - all the way down; good current
Br_0 offset = .007 rise; NL04=1.15e20

15 more PG3 volts; NL04=1.6e20 fizzle; Br not positive enough

16 BR_0 offset = .0075; 2msec less plasma - disr. @ 1.34; shark fin; fill
prefill puff (now 14msec) pressure=0.8e-5; NL04=1.5e20 after
detach @ 0.57

17 PG2 with 20PSIA deuterium and fizzle (weak); need more Bz earlier
30V waveform

18 IC_EF4 = -1130A plasma - disr. @ 1.34; no RF; divertor
detachment

19 NL04=1.9e20; PG2 = 45V fizzle - fields o.k. - fill unknown

20 no changes fizzle

21 BR_0 offset = .0069 plasma - disr. @ 1.21 - good curr rise

22 BR_0 offset = .0064; PG2 pulse fizzle - fields look fine
to make sure its open

23 reload 960112008 - a fiducial plasma - all the way down; good fiducial

24 NL04=0.8e20 and less PG3 volts; fizzle - fields look o.k.
BR_0 offset=.0064 and V_OH1
= 150V from .005 to .015

25 no changes plasma - all the way down; density
creeping up during shot

26 PG3 = 20V plasma - all the way down; NL04 = 0.8->
0.9e20

27 PG3=10V; NL04=0.69e20 plasma - all the way down; NL04=0.8e20

28 PG3=0V; NL04=0.55e20 fizzle (strong)

29 no changes fizzle (strong); Br too negative

30 Br_0 offset = .0069; V_OH1 = plasma - all the way down; NL04=0.6e20
170V from .005 to .015

31 no changes plasma - all the way down; NL04=0.66e20

32 no changes plasma - all the way down; ohmic H-mode
NL04=0.66e20 at transition

33 disable argon puff plasma - all the way down; no RF; no
H-modes; NL04=0.55e20

34 NL04=1e20 adn PG3=25V plasma - all the way down; NL04=0.9->1.0
e20; 0.3MW RF (H-mode)

35 PG3=35V plasma - all the way down; NL04=1.1e20
1.MW RF (H-mode)

36 no changes plasma - all the way down; NL04=1.1e20
1.5MW RF (H-mode)

37 setup for fiducial; PG3=30V plasma - all the way down; NL04=1.1e20
acceptable fiducial

38 enable Ar puff (12msec) and fizzle (weak)
enable LPI

39 no changes plasma - disr. @ 1.19; no Li pellet

Session Leader Comments

Jan 12 1996 08:55:24:290AM Gary McCracken MP 113 Boronization of Alcator C_Mod
S/L G McCracken
P/O J Goetz
E/O V Bertolino
The boronization has been caried out on 1/7,1/9,and 1/10 using ECDC to
decompose the borane gas in the vessel. The total number of boron atoms
injected was ~ 2e23, corresponding to a layer 100 nm thick if it were
uniformly distributed. Observation indicated that it had gone around
about 90 degrees each way from the injection port.

The object of todays run is to first repeat 5 fiducial shots similar to
the pre-boronization run on 1/6. Then do a density scan.

Jan 12 1996 05:23:32:120PM Gary McCracken Summary:
Very successful run. The boronization seems to have reduced the
Mo during RF by about an order of magnitude, from a brightness of 6 to
8e15 photons/ster/cm2/s to a value of 0.7 to 0.8 photons ....
The fraction of the total power radiated has also fallen significantly,
to less than 30%.
We completed 5 fiducial shots and a density scan from nl04=5e19 to
1.9e20. At 5.5e19 with 1MW ICRH there was no H-mode, establishing the
lower limit of the H-mode
An RF power scan from 0 to 1.4 MW in 5 steps should provide some
interesting scaling of edge parameters. The power was steady from 0.7
to 1.0 s establishing steady state conditions.
In some H-mode shots we had an H factor up t0 1.5 the highest yet
achieved with RF in C-Mod

Jan 12 1996 08:59:50:580AM 960112001 Gary McCracken Ohmic heating test shot

Jan 12 1996 09:08:47:910AM 960112002 Gary McCracken First attempt at fiducial shot. Good shot but the density was low
throughout the shot. nlo4 only gets up to 0.9e20 at 0.9 s. The
fiducial program did not run and the RF was not on.
The CII (5145) was down by a factor of 2 or 3 from the pre-boronization
shots on 1/5.Te(0) was ~1300 eV , rather similar to 1/5
Try again.

Jan 12 1996 09:12:36:330AM 960112002 Gary McCracken Mo monitor not on

Jan 12 1996 09:28:30:640AM 960112003 Gary McCracken Good shot. Density got up to 1e20 at 0.6 s. when the RF came on
it rose slightly and then we had an H-mode. The density rose to 1.5e20
The CII level is about the same as the previous shot. However the Mo
monitor is much lower than preboronization. The brightness is~1.5e15
during RF . Also Steve Golovato reports an H factor of 1.5

Jan 12 1996 09:37:24:380AM 960112004 Gary McCracken Good shot. Density got up to 1e20 at 0.6 s. When the RF came on
it went into H-mode immediately and the density rose to 1.7e20. The CII
is now increasing slightly when the RF comes on.
The Mo monitor indicates an initial brighteness of 0.7e15 after the RF
comes on but increases during the RF pulse to 1.4e15. Looks good

Jan 12 1996 09:50:54:260AM 960112004 Gary McCracken Chromex up and running. Very strong BII line at 345.1 nm and a weaker
line at 332.3. The signal seems to be all in bin2 ie the view from the
top with a little in bin 1 a-side. the time history shows that it is
coming up early in the shot and peaking at about 0.5 s

Jan 12 1996 09:51:27:220AM 960112005 Gary McCracken Unexplained fizzle

Jan 12 1996 10:05:51:760AM 960112006 Gary McCracken Good shot. Similar density trace to shot 4.
Mo still low but there was as injection at 0.92 s
H-mode at 0.77 s.
Joe Snipes reports that the OI_sig monitor is down almost a factor of 2
Total radiated power Prad bolo is low at ~300 kW during ohmic phase,
increasing to nearly 600 kW during RF

Jan 12 1996 10:06:10:200AM 960112007 Gary McCracken Fizzle

Jan 12 1996 10:25:28:000AM 960112008 Gary McCracken Good shot. Similar to shot 006.
Mo brightness going down further.
H-factor going up. It was 1.8 in shot 006

Jan 12 1996 10:34:17:950AM 960112009 Gary McCracken Good shot. Again a similar to shot 006.

We have now concluded the 5 good fiducial shots.
We will start a density scan next shot

Jan 12 1996 10:35:42:930AM 960112010 Gary McCracken Good shot. Density called for 1.3e20.
Fizzle

Jan 12 1996 11:15:57:490AM 960112011 Gary McCracken Good shot. Density called for 1.3e20.: got to 1.15e20
Mo 0.97e15 during RF, down a little, possibly because the density is up
H factor down to 1.5
CII up to 0.026

Jan 12 1996 11:16:36:390AM 960112012 Gary McCracken Fizzle

Jan 12 1996 11:16:46:450AM 960112013 Gary McCracken Fizzle

Jan 12 1996 11:41:09:370AM 960112014 Gary McCracken Good shot. Calling for nlo4=1.3e20; got 1.15e20
similar to shot 011.
Try to push density higher in the next shot

Jan 12 1996 11:42:29:170AM 960112015 Gary McCracken Fizzle

Jan 12 1996 12:12:36:270PM 960112016 Gary McCracken Good shot. Density increased t0 1.47 at 0.8 s.
No RF ; wasn't tuned for higher density
Very good detachment at 0.62 s Density nl04 was 1.26e20 which is a little
higher than pre boronization. Te at target goes down to 1.5 eV

Jan 12 1996 12:23:35:110PM 960112017 Gary McCracken Fizzle

Jan 12 1996 12:35:40:250PM 960112018 Gary McCracken Good shot, nlo4 1.5e20. but no RF; like shot 016

Jan 12 1996 12:35:57:570PM 960112019 Gary McCracken Fizzle

Jan 12 1996 12:42:39:980PM 960112019 Gary McCracken Fizzle

Jan 12 1996 12:42:52:040PM 960112020 Gary McCracken Fizzle

Jan 12 1996 01:06:43:040PM 960112021 Gary McCracken Good shot but no RF.
Density demand =1.8e20; obtained 1.73 at 0.9 s
Still detaching early with very low target temperatures ~ 2 eV
Try to get some RF on the next shot.

Jan 12 1996 01:09:58:820PM 960112022 Gary McCracken Fizzle.
Seems to be a problem with these high density shots.
We will go back to the fiducial shots settings for the next shot

Jan 12 1996 01:28:46:240PM 960112023 Gary McCracken Fiducial shot settings; Ask for nl04=1.0e20
Good shot. RF power but a little low.
Obtained a good H-mode , very similar to shots 8 and 9
Mo monitor and Prad both a little lower than earlier

Jan 12 1996 01:40:39:960PM 960112023 Gary McCracken Recovered the good H factor again. It increases to 1.8 briefly
and then falls monotonically.

Jan 12 1996 01:41:03:050PM 960112024 Gary McCracken Fizzle

Jan 12 1996 01:56:35:400PM 960112025 Gary McCracken Good shot with RF, but power a little low. Asked for 0.8e20 but got
1.0e20. H-mode

Jan 12 1996 02:12:41:800PM 960112026 Gary McCracken Good shot with RF, power up to 1.1 MW from 0.75 s to 1.0 s
Asked for density 0.8e20 but got 0.9e20. H-mode looks good,
although the Halpha signal looks funny.
Target tempeatures are getting quite high . Up to ~40 eV at the
separatrix on probe 2. 1.5 MW getting into the SOL

Jan 12 1996 02:26:31:340PM 960112027 Gary McCracken Good shot with RF, power up to 1.1 MW from 0.75 s to 1.0 s
Density 0.8e20 increasing to 1.5 during H-mode. H-mode looks good
starting at 0.75 s and lasting all the RF pulse
Target temperatures are again high.

Jan 12 1996 02:26:52:990PM 960112028 Gary McCracken Fizzle

Jan 12 1996 02:29:13:830PM 960112028 Gary McCracken Fizzle

Jan 12 1996 02:30:33:860PM 960112029 Gary McCracken Fizzle

Jan 12 1996 02:54:03:260PM 960112030 Gary McCracken Good shot. nlo4 =0.6e20. Got initially 1.5 MW at 0.7 s but it tripped
out at 0.78 s. No H mode Try again at 0.6e20

Jan 12 1996 03:00:08:280PM 960112031 Gary McCracken Good shot. nlo4 =0.67e20. Still have not got RF to stay on
continuously. However when it does come on we get brief H-modes
Try again

Jan 12 1996 03:20:22:890PM 960112032 Gary McCracken Good shot. nlo4 =0.67e20. RF on at 1 MW from 0.7 to 1.0 s, but there
were 2 interrupts which spoiled the H modes. Mo monitor went up
1e15 during RF

Jan 12 1996 03:26:40:390PM 960112033 Gary McCracken Good shot. Lower density 1 MW RF power steady from 0.7 to 1.0 s
nl04=0.55e20. NO H MODES. So we seem to be below the density
required for H modes. Mo level stays low.

Jan 12 1996 03:39:56:690PM 960112034 Gary McCracken Good shot. Density back to 1e20 Reduced RF power to 0.31 MW .
H-mode starts at 0.82 s and remains to the end of the RF pulse even
though the RF power falls to 0.25 MW. Mo increases to 0.75e15

Jan 12 1996 03:52:50:540PM 960112034 Gary McCracken Good shot. Density back to 1e20 RF power 1 MW from 0.7 to 1.0s.
H-mode starts at 0.73 s and remains to the end of the RF pulse. Very
good steady state conditions with lower Mo than in earlier fiducial
shots and total radiation being down to ~40%.

Jan 12 1996 03:52:58:030PM 960112035 Gary McCracken Good shot. Density back to 1e20 RF power 1 MW from 0.7 to 1.0s.
H-mode starts at 0.73 s and remains to the end of the RF pulse. Very
good steady state conditions with lower Mo than in earlier fiducial
shots and total radiation being down to ~40%.

Jan 12 1996 03:55:18:160PM 960112035 Gary McCracken Correction radiated power fraction is only 28%

Jan 12 1996 04:15:53:820PM 960112036 Gary McCracken Good shot. RF power is 1.44 MW . Radiated power down to 26%
Mo level still below 1e15
This completes the RF power scan.
We will do a proper fiducial shot next time

Jan 12 1996 04:34:38:740PM 960112037 Gary McCracken Good shot. Standard fiducial shot. The shots 34 thru 37 give us a
rather good RF power scan, 0.0, 0.3, 0.8 1.0 and 1.4 MW

Jan 12 1996 04:47:41:080PM 960112037 Gary McCracken Good shot. Standard fiducial shot. The shots 34 thru 37 give us a
rather good RF power scan, 0.0, 0.3, 0.8 1.0 and 1.4 MW.

For this shot the Mo monitor gives a Mo level during the RF
significantly lower (~0.8e15) than in the earlier fiducial shots
#003-009.(1.2 to 1.6e15) and much lower than before boronization
(6 to 8e15)

Jan 12 1996 04:50:14:010PM 960112038 Gary McCracken Fizzle

Jan 12 1996 05:11:59:510PM 960112039 Gary McCracken Attempt a PEP discharge using a Li pellet at 0.75 s with RF immediately
after the pellet injection.
Good shot but no pellet. Very nice constant RF power at 1 MW from 0.75
to 1.0 s. Low Mo and low Prad.

Physics Operator Comments

Jan 12 1996 08:39:04:680AM John Goetz Run 960112 - MiniProposal # 133A: Boronization of Alcator C-Mod
The goal of this run is to implement ECDC boronization of
C-Mod and make a preliminary evaluation of its utility with
respect to wall conditioning, impurity influx, recycling,
divertor dynamics and energy confinement enhancement in H-mode
and PEP-mode.

Program for this run:
- Learn how to run with boronized walls
- Run a set of fiducials (5)
- Density scan
- ion cyclotron range of frequencies power scan
- PEP studies with lithium pellets

Jan 12 1996 08:41:25:840AM John Goetz Run 960112
Engineering setup:
ECDC in helium
power supplies from 960105010
A_SIDE with 20PSIA of deuterium
B_TOP with 5PSIA of deuterium
puff pre-fill - hybrid enable A_SIDE and B_TOP

Coldstart hybrid - all matrices respond
Load 960105010 - no changes

Jan 12 1996 08:46:08:580AM 960112001 John Goetz Shot 960112001:
OH coax resistance test

Results:
resistances look o.k.

Jan 12 1996 09:13:16:430AM 960112002 John Goetz Shot 960112002:
load fiducial shot 960105010 - no changes

Results:
plasma - all the way down
density doesn't get to where its going - PG3 waveform
is just a small square wave late in time
many injections - presumably Mo
Hard x-rays and non-thermal ECE
position wiggling early in the shot

Jan 12 1996 09:26:22:410AM 960112003 John Goetz Shot 960112003:
load reasonable waveform into PG3
enable VUV tree and turn on RF

Results:
plasma - all the way down
RF on
moly down - H factor up
density waveform much better

Jan 12 1996 09:38:18:800AM 960112004 John Goetz Shot 960112004:
ramp NL04 to max @ 0.5 sec

Results:
plasma - all the way down
moly very low
H-mode @ 0.78sec

Jan 12 1996 09:38:20:270AM 960112004 John Goetz Shot 960112004:
ramp NL04 to max @ 0.5 sec

Results:
plasma - all the way down
moly very low
H-mode @ 0.78sec

Jan 12 1996 09:48:13:680AM 960112005 John Goetz Shot 960112005:
no changes

Results:
fizzle - very weak one
null looks good
no Ratiomatic data - can't talk about the fill, but it
had been running around 1.7e-5

Jan 12 1996 09:58:50:960AM 960112006 John Goetz Shot 960112006:
no changes

Results:
plasma - all the way down
very good current rise
Mo injection @ 0.91

Jan 12 1996 10:10:20:500AM 960112007 John Goetz Shot 960112007:
no changes

Results:
fizzle
null looks o.k.
radial field about .5mT lower on 005 and 007 than on 004 and 006

Jan 12 1996 10:21:13:530AM 960112008 John Goetz Shot 960112008:
Br_0 offset = .0072

Results:
plasma - all the way down
big Mo increase during OH1 crossover

Jan 12 1996 10:31:37:040AM 960112009 John Goetz Shot 960112009:
no changes

Results:
plasma - all the way down
good fiducial shot

Jan 12 1996 10:46:49:160AM 960112010 John Goetz Shot 960112010:
NL_04 = 1.3e20 and more PG3 volts

Results:
fizzle - looks like it is hitting something
vertical field not getting in fast enough - EF4 not getting
to its programmed value; but these are opposite effects

Jan 12 1996 11:00:13:580AM 960112011 John Goetz Shot 960112011:
Br_0 offset = .0075

Results:
plasma - all the way down
good current rise
NL04 = 1.15e20 only

Jan 12 1996 11:08:28:640AM 960112012 John Goetz Shot 960112012:
add more volts to PG3 to help with the density
ZXL = -.02 @ 0.4sec to keep the strike point down

Results:
fizzle (weak)
not enough Bz fast enough?

Jan 12 1996 11:23:04:520AM 960112013 John Goetz Shot 960112013:
IC_EF4 = -1140A (was -1150A)
add 2 msec to prefill puff

Results:
fizzle (weak)
no ratiomatic data - can't diagnose the fill pressure

Jan 12 1996 11:35:14:740AM 960112014 John Goetz Shot 960112014:
remove 4 msec to prefill puff
BR_0 offset = .007

Results:
plasma - all the way down
good current rise
no ratiomatic data again to diagnose prefill
NL04 = 1.15e20

Jan 12 1996 11:44:24:070AM 960112015 John Goetz Shot 960112015:
more PG3 volts and NL04 = 1.6e20

Results:
fizzle (weak one)
radial field 1mT (on 951218 it was 1.5mT)

Jan 12 1996 12:05:08:780PM 960112016 John Goetz Shot 960112016:
remove 2msec from prefill (now 14msec)
BR_0 offset = .0075

Results:
plasma - disruption @ 1.34
NL04 = 1.5e20, but only after a divertor detachment @ 1.57;
then the gas gets in
shark fin
fill pressure = 0.8e-5

Jan 12 1996 12:11:38:470PM 960112017 John Goetz Shot 960112017:
enable PG2 with 20PSIA deuterium
draw 30V square wave on PG2 from .3 to .9 sec

Results:
fizzle (weak)
Bz may need to come in earlier

Jan 12 1996 12:27:04:490PM 960112018 John Goetz Shot 960112018:
IC_EF4 = -1130A

Results:
plasma - disr. @ 1.34 due to a shark fin
no RF again; divertor detachment

Jan 12 1996 12:37:31:770PM 960112019 John Goetz Shot 960112019:
NL04 = 1.9e20 (expect 1.8e20)
PG2 volts = 45

Results:
fizzle - fields look o.k. - can't read the fill

Jan 12 1996 12:48:06:930PM 960112020 John Goetz Shot 960112020:
no changes

Results:
fizzle - why??

Jan 12 1996 01:00:39:630PM 960112021 John Goetz Shot 960112021:
BR_0 offset = .0069

Results:
plasma - disr. @ 1.21
good current rise
only get to requested density at end of discharge

Jan 12 1996 01:10:37:540PM 960112022 John Goetz Shot 960112022:
BR_0 offset = .0064
add 100V pulse to PG2 to make sure the valve opens

Results:
fizzle - fields look fine

Jan 12 1996 01:23:42:360PM 960112023 John Goetz Shot 960112023:
reload 960112008 - a fiducial

Results:
plasma - all the way down
not the best current rise, but adequate
good fiducial

Jan 12 1996 01:33:22:310PM 960112024 John Goetz Shot 960112024:
NL04 = 0.8e20 and less PG3 volts
BR_0 offset = .0064 and V_OH1=150V from .005 to .015

Results:
fizzle - fields look o.k.

Jan 12 1996 01:51:37:990PM 960112025 John Goetz Shot 960112025:
no changes

Results:
plasma - all the way down
density creeping up during the shot ( wall fueling? )

Jan 12 1996 02:01:07:460PM 960112026 John Goetz Shot 960112026:
remove some PG3 volts (down to 20V)

Results:
plasma - all the way down
NL04 = 0.8 -> 0.9e20

Jan 12 1996 02:10:45:870PM 960112027 John Goetz Shot 960112027:
remove some PG3 volts (down to 10V)
NL04 = 0.69e20

Results:
plasma - all the way down
NL04 = 0.8e20 and fairly constant
ELMy H-mode

Jan 12 1996 02:27:14:520PM 960112028 John Goetz Shot 960112028:
PG3 = 0V
NL04 = 0.55e20

Results:
fizzle (strong)
Dalpha just never burns out

Jan 12 1996 02:33:51:210PM 960112029 John Goetz Shot 960112029:
no changes

Results:
fizzle (strong)
Wolfe says Br too negative

Jan 12 1996 02:46:07:620PM 960112030 John Goetz Shot 960112030:
BR_0 offset = .0069
V_OH1 = 170V from .005 to .015

Results:
plasma - all the way down
NL04 = 0.6e20

Jan 12 1996 02:54:18:390PM 960112031 John Goetz Shot 960112031:
no changes

Results:
plasma - all the way down
NL04 = 0.66e20
RF tried to stay on

Jan 12 1996 03:12:01:610PM 960112032 John Goetz Shot 960112032:
no changes

Results:
plasma - all the way down
ohmic H-mode @ 0.56 (NL04 = 0.66e20 before transition)
RF H-modes later

Jan 12 1996 03:12:03:110PM 960112032 John Goetz Shot 960112032:
no changes

Results:
plasma - all the way down
ohmic H-mode @ 0.56 (NL04 = 0.66e20 before transition)
RF H-modes later

Jan 12 1996 03:20:23:440PM 960112033 John Goetz Shot 960112033:
disable Argon puff

Results:
plasma - all the way down
NL04 = 0.55e20
no RF

Jan 12 1996 03:33:29:880PM 960112034 John Goetz Shot 960112034:
NL04 = 1e20 and PG3 = 25V

Results:
plasma - all the way down
NL04 = 0.9->1.0e20
0.3MW of RF power (H-mode)

Jan 12 1996 03:43:41:670PM 960112035 John Goetz Shot 960112035:
PG3 = 35V

Results:
plasma - all the way down
RF power = 1.0MW (H-mode)

Jan 12 1996 04:01:02:170PM 960112036 John Goetz Shot 960112036:
no changes

Results:
plasma - all the way down
NL04 => 1.1e20
RF power = 1.5MW

Jan 12 1996 04:27:30:530PM 960112037 John Goetz Shot 960112037:
setup for fiducial
PG3 = 30V

Results:
plasma - all the way down
acceptable fiducial

Jan 12 1996 04:48:48:530PM 960112038 John Goetz Shot 960112038:
enable Ar puff (12msec)
enable LPI for attempt at PEP-mode

Results:
fizzle (weak)

Jan 12 1996 04:57:48:130PM 960112039 John Goetz Shot 960112039:
no changes

Results:
plasma - disr. @ 1.19
no Li pellet

Engineering Operator Comments

Shot Time Type Status Comment

1 08:41:07:750AM Test Ok

2 08:53:04:770AM Plasma Ok

3 09:12:28:870AM Plasma Ok

4 09:26:51:650AM Plasma Ok

5 09:38:35:250AM Plasma Ok

6 09:48:34:980AM Plasma Ok

7 10:01:04:570AM Plasma Ok

8 10:11:18:980AM Plasma Ok

9 10:21:36:720AM Plasma Ok

10 10:33:54:240AM Plasma Ok

11 10:46:50:500AM Plasma Ok

12 11:00:48:390AM Plasma Ok

13 11:15:06:170AM Plasma Ok

14 11:23:43:310AM Plasma Ok

15 11:34:51:310AM Plasma Ok

16 11:50:25:010AM Plasma Ok

17 12:04:54:630PM Plasma Ok

18 12:13:11:560PM Plasma Ok

19 12:30:47:920PM Plasma Ok

20 12:40:44:600PM Plasma Ok

21 12:49:49:990PM Plasma Ok

22 01:03:34:170PM Plasma Ok

23 01:12:13:220PM Plasma Ok No Faults.

24 01:26:59:730PM Plasma Ok comm fault bybass OH2U & OH1

25 01:39:35:900PM Plasma Ok

26 01:51:51:060PM Plasma Ok no faults

27 02:02:49:430PM Plasma Ok

28 02:14:17:170PM Plasma Ok

29 02:25:31:630PM Plasma Ok OH2 Comm. Fault Bypass

30 02:35:36:930PM Plasma Ok

31 02:48:15:290PM Plasma Ok

32 02:59:11:890PM Plasma Ok

33 03:12:44:390PM Plasma Ok

34 03:25:30:760PM Plasma Ok

35 03:36:38:610PM Plasma Ok

36 03:53:28:690PM Plasma Ok

37 04:18:07:570PM Plasma Ok

38 04:42:53:350PM Plasma Ok

39 04:51:25:990PM Plasma Ok

Session Leader Comments
Jan 12 1996 08:55:24:290AM		Gary McCracken	MP 113 Boronization of Alcator C_Mod S/L G McCracken P/O J Goetz E/O V Bertolino The boronization has been caried out on 1/7,1/9,and 1/10 using ECDC to decompose the borane gas in the vessel. The total number of boron atoms injected was ~ 2e23, corresponding to a layer 100 nm thick if it were uniformly distributed. Observation indicated that it had gone around about 90 degrees each way from the injection port. The object of todays run is to first repeat 5 fiducial shots similar to the pre-boronization run on 1/6. Then do a density scan.
Jan 12 1996 05:23:32:120PM		Gary McCracken	Summary: Very successful run. The boronization seems to have reduced the Mo during RF by about an order of magnitude, from a brightness of 6 to 8e15 photons/ster/cm2/s to a value of 0.7 to 0.8 photons .... The fraction of the total power radiated has also fallen significantly, to less than 30%. We completed 5 fiducial shots and a density scan from nl04=5e19 to 1.9e20. At 5.5e19 with 1MW ICRH there was no H-mode, establishing the lower limit of the H-mode An RF power scan from 0 to 1.4 MW in 5 steps should provide some interesting scaling of edge parameters. The power was steady from 0.7 to 1.0 s establishing steady state conditions. In some H-mode shots we had an H factor up t0 1.5 the highest yet achieved with RF in C-Mod
Jan 12 1996 08:59:50:580AM	960112001	Gary McCracken	Ohmic heating test shot
Jan 12 1996 09:08:47:910AM	960112002	Gary McCracken	First attempt at fiducial shot. Good shot but the density was low throughout the shot. nlo4 only gets up to 0.9e20 at 0.9 s. The fiducial program did not run and the RF was not on. The CII (5145) was down by a factor of 2 or 3 from the pre-boronization shots on 1/5.Te(0) was ~1300 eV , rather similar to 1/5 Try again.
Jan 12 1996 09:12:36:330AM	960112002	Gary McCracken	Mo monitor not on
Jan 12 1996 09:28:30:640AM	960112003	Gary McCracken	Good shot. Density got up to 1e20 at 0.6 s. when the RF came on it rose slightly and then we had an H-mode. The density rose to 1.5e20 The CII level is about the same as the previous shot. However the Mo monitor is much lower than preboronization. The brightness is~1.5e15 during RF . Also Steve Golovato reports an H factor of 1.5
Jan 12 1996 09:37:24:380AM	960112004	Gary McCracken	Good shot. Density got up to 1e20 at 0.6 s. When the RF came on it went into H-mode immediately and the density rose to 1.7e20. The CII is now increasing slightly when the RF comes on. The Mo monitor indicates an initial brighteness of 0.7e15 after the RF comes on but increases during the RF pulse to 1.4e15. Looks good
Jan 12 1996 09:50:54:260AM	960112004	Gary McCracken	Chromex up and running. Very strong BII line at 345.1 nm and a weaker line at 332.3. The signal seems to be all in bin2 ie the view from the top with a little in bin 1 a-side. the time history shows that it is coming up early in the shot and peaking at about 0.5 s
Jan 12 1996 09:51:27:220AM	960112005	Gary McCracken	Unexplained fizzle
Jan 12 1996 10:05:51:760AM	960112006	Gary McCracken	Good shot. Similar density trace to shot 4. Mo still low but there was as injection at 0.92 s H-mode at 0.77 s. Joe Snipes reports that the OI_sig monitor is down almost a factor of 2 Total radiated power Prad bolo is low at ~300 kW during ohmic phase, increasing to nearly 600 kW during RF
Jan 12 1996 10:06:10:200AM	960112007	Gary McCracken	Fizzle
Jan 12 1996 10:25:28:000AM	960112008	Gary McCracken	Good shot. Similar to shot 006. Mo brightness going down further. H-factor going up. It was 1.8 in shot 006
Jan 12 1996 10:34:17:950AM	960112009	Gary McCracken	Good shot. Again a similar to shot 006. We have now concluded the 5 good fiducial shots. We will start a density scan next shot
Jan 12 1996 10:35:42:930AM	960112010	Gary McCracken	Good shot. Density called for 1.3e20. Fizzle
Jan 12 1996 11:15:57:490AM	960112011	Gary McCracken	Good shot. Density called for 1.3e20.: got to 1.15e20 Mo 0.97e15 during RF, down a little, possibly because the density is up H factor down to 1.5 CII up to 0.026
Jan 12 1996 11:16:36:390AM	960112012	Gary McCracken	Fizzle
Jan 12 1996 11:16:46:450AM	960112013	Gary McCracken	Fizzle
Jan 12 1996 11:41:09:370AM	960112014	Gary McCracken	Good shot. Calling for nlo4=1.3e20; got 1.15e20 similar to shot 011. Try to push density higher in the next shot
Jan 12 1996 11:42:29:170AM	960112015	Gary McCracken	Fizzle
Jan 12 1996 12:12:36:270PM	960112016	Gary McCracken	Good shot. Density increased t0 1.47 at 0.8 s. No RF ; wasn't tuned for higher density Very good detachment at 0.62 s Density nl04 was 1.26e20 which is a little higher than pre boronization. Te at target goes down to 1.5 eV
Jan 12 1996 12:23:35:110PM	960112017	Gary McCracken	Fizzle
Jan 12 1996 12:35:40:250PM	960112018	Gary McCracken	Good shot, nlo4 1.5e20. but no RF; like shot 016
Jan 12 1996 12:35:57:570PM	960112019	Gary McCracken	Fizzle
Jan 12 1996 12:42:39:980PM	960112019	Gary McCracken	Fizzle
Jan 12 1996 12:42:52:040PM	960112020	Gary McCracken	Fizzle
Jan 12 1996 01:06:43:040PM	960112021	Gary McCracken	Good shot but no RF. Density demand =1.8e20; obtained 1.73 at 0.9 s Still detaching early with very low target temperatures ~ 2 eV Try to get some RF on the next shot.
Jan 12 1996 01:09:58:820PM	960112022	Gary McCracken	Fizzle. Seems to be a problem with these high density shots. We will go back to the fiducial shots settings for the next shot
Jan 12 1996 01:28:46:240PM	960112023	Gary McCracken	Fiducial shot settings; Ask for nl04=1.0e20 Good shot. RF power but a little low. Obtained a good H-mode , very similar to shots 8 and 9 Mo monitor and Prad both a little lower than earlier
Jan 12 1996 01:40:39:960PM	960112023	Gary McCracken	Recovered the good H factor again. It increases to 1.8 briefly and then falls monotonically.
Jan 12 1996 01:41:03:050PM	960112024	Gary McCracken	Fizzle
Jan 12 1996 01:56:35:400PM	960112025	Gary McCracken	Good shot with RF, but power a little low. Asked for 0.8e20 but got 1.0e20. H-mode
Jan 12 1996 02:12:41:800PM	960112026	Gary McCracken	Good shot with RF, power up to 1.1 MW from 0.75 s to 1.0 s Asked for density 0.8e20 but got 0.9e20. H-mode looks good, although the Halpha signal looks funny. Target tempeatures are getting quite high . Up to ~40 eV at the separatrix on probe 2. 1.5 MW getting into the SOL
Jan 12 1996 02:26:31:340PM	960112027	Gary McCracken	Good shot with RF, power up to 1.1 MW from 0.75 s to 1.0 s Density 0.8e20 increasing to 1.5 during H-mode. H-mode looks good starting at 0.75 s and lasting all the RF pulse Target temperatures are again high.
Jan 12 1996 02:26:52:990PM	960112028	Gary McCracken	Fizzle
Jan 12 1996 02:29:13:830PM	960112028	Gary McCracken	Fizzle
Jan 12 1996 02:30:33:860PM	960112029	Gary McCracken	Fizzle
Jan 12 1996 02:54:03:260PM	960112030	Gary McCracken	Good shot. nlo4 =0.6e20. Got initially 1.5 MW at 0.7 s but it tripped out at 0.78 s. No H mode Try again at 0.6e20
Jan 12 1996 03:00:08:280PM	960112031	Gary McCracken	Good shot. nlo4 =0.67e20. Still have not got RF to stay on continuously. However when it does come on we get brief H-modes Try again
Jan 12 1996 03:20:22:890PM	960112032	Gary McCracken	Good shot. nlo4 =0.67e20. RF on at 1 MW from 0.7 to 1.0 s, but there were 2 interrupts which spoiled the H modes. Mo monitor went up 1e15 during RF
Jan 12 1996 03:26:40:390PM	960112033	Gary McCracken	Good shot. Lower density 1 MW RF power steady from 0.7 to 1.0 s nl04=0.55e20. NO H MODES. So we seem to be below the density required for H modes. Mo level stays low.
Jan 12 1996 03:39:56:690PM	960112034	Gary McCracken	Good shot. Density back to 1e20 Reduced RF power to 0.31 MW . H-mode starts at 0.82 s and remains to the end of the RF pulse even though the RF power falls to 0.25 MW. Mo increases to 0.75e15
Jan 12 1996 03:52:50:540PM	960112034	Gary McCracken	Good shot. Density back to 1e20 RF power 1 MW from 0.7 to 1.0s. H-mode starts at 0.73 s and remains to the end of the RF pulse. Very good steady state conditions with lower Mo than in earlier fiducial shots and total radiation being down to ~40%.
Jan 12 1996 03:52:58:030PM	960112035	Gary McCracken	Good shot. Density back to 1e20 RF power 1 MW from 0.7 to 1.0s. H-mode starts at 0.73 s and remains to the end of the RF pulse. Very good steady state conditions with lower Mo than in earlier fiducial shots and total radiation being down to ~40%.
Jan 12 1996 03:55:18:160PM	960112035	Gary McCracken	Correction radiated power fraction is only 28%
Jan 12 1996 04:15:53:820PM	960112036	Gary McCracken	Good shot. RF power is 1.44 MW . Radiated power down to 26% Mo level still below 1e15 This completes the RF power scan. We will do a proper fiducial shot next time
Jan 12 1996 04:34:38:740PM	960112037	Gary McCracken	Good shot. Standard fiducial shot. The shots 34 thru 37 give us a rather good RF power scan, 0.0, 0.3, 0.8 1.0 and 1.4 MW
Jan 12 1996 04:47:41:080PM	960112037	Gary McCracken	Good shot. Standard fiducial shot. The shots 34 thru 37 give us a rather good RF power scan, 0.0, 0.3, 0.8 1.0 and 1.4 MW. For this shot the Mo monitor gives a Mo level during the RF significantly lower (~0.8e15) than in the earlier fiducial shots #003-009.(1.2 to 1.6e15) and much lower than before boronization (6 to 8e15)
Jan 12 1996 04:50:14:010PM	960112038	Gary McCracken	Fizzle
Jan 12 1996 05:11:59:510PM	960112039	Gary McCracken	Attempt a PEP discharge using a Li pellet at 0.75 s with RF immediately after the pellet injection. Good shot but no pellet. Very nice constant RF power at 1 MW from 0.75 to 1.0 s. Low Mo and low Prad.

Physics Operator Comments
Jan 12 1996 08:39:04:680AM		John Goetz	Run 960112 - MiniProposal # 133A: Boronization of Alcator C-Mod The goal of this run is to implement ECDC boronization of C-Mod and make a preliminary evaluation of its utility with respect to wall conditioning, impurity influx, recycling, divertor dynamics and energy confinement enhancement in H-mode and PEP-mode. Program for this run: - Learn how to run with boronized walls - Run a set of fiducials (5) - Density scan - ion cyclotron range of frequencies power scan - PEP studies with lithium pellets
Jan 12 1996 08:41:25:840AM		John Goetz	Run 960112 Engineering setup: ECDC in helium power supplies from 960105010 A_SIDE with 20PSIA of deuterium B_TOP with 5PSIA of deuterium puff pre-fill - hybrid enable A_SIDE and B_TOP Coldstart hybrid - all matrices respond Load 960105010 - no changes
Jan 12 1996 08:46:08:580AM	960112001	John Goetz	Shot 960112001: OH coax resistance test Results: resistances look o.k.
Jan 12 1996 09:13:16:430AM	960112002	John Goetz	Shot 960112002: load fiducial shot 960105010 - no changes Results: plasma - all the way down density doesn't get to where its going - PG3 waveform is just a small square wave late in time many injections - presumably Mo Hard x-rays and non-thermal ECE position wiggling early in the shot
Jan 12 1996 09:26:22:410AM	960112003	John Goetz	Shot 960112003: load reasonable waveform into PG3 enable VUV tree and turn on RF Results: plasma - all the way down RF on moly down - H factor up density waveform much better
Jan 12 1996 09:38:18:800AM	960112004	John Goetz	Shot 960112004: ramp NL04 to max @ 0.5 sec Results: plasma - all the way down moly very low H-mode @ 0.78sec
Jan 12 1996 09:38:20:270AM	960112004	John Goetz	Shot 960112004: ramp NL04 to max @ 0.5 sec Results: plasma - all the way down moly very low H-mode @ 0.78sec
Jan 12 1996 09:48:13:680AM	960112005	John Goetz	Shot 960112005: no changes Results: fizzle - very weak one null looks good no Ratiomatic data - can't talk about the fill, but it had been running around 1.7e-5
Jan 12 1996 09:58:50:960AM	960112006	John Goetz	Shot 960112006: no changes Results: plasma - all the way down very good current rise Mo injection @ 0.91
Jan 12 1996 10:10:20:500AM	960112007	John Goetz	Shot 960112007: no changes Results: fizzle null looks o.k. radial field about .5mT lower on 005 and 007 than on 004 and 006
Jan 12 1996 10:21:13:530AM	960112008	John Goetz	Shot 960112008: Br_0 offset = .0072 Results: plasma - all the way down big Mo increase during OH1 crossover
Jan 12 1996 10:31:37:040AM	960112009	John Goetz	Shot 960112009: no changes Results: plasma - all the way down good fiducial shot
Jan 12 1996 10:46:49:160AM	960112010	John Goetz	Shot 960112010: NL_04 = 1.3e20 and more PG3 volts Results: fizzle - looks like it is hitting something vertical field not getting in fast enough - EF4 not getting to its programmed value; but these are opposite effects
Jan 12 1996 11:00:13:580AM	960112011	John Goetz	Shot 960112011: Br_0 offset = .0075 Results: plasma - all the way down good current rise NL04 = 1.15e20 only
Jan 12 1996 11:08:28:640AM	960112012	John Goetz	Shot 960112012: add more volts to PG3 to help with the density ZXL = -.02 @ 0.4sec to keep the strike point down Results: fizzle (weak) not enough Bz fast enough?
Jan 12 1996 11:23:04:520AM	960112013	John Goetz	Shot 960112013: IC_EF4 = -1140A (was -1150A) add 2 msec to prefill puff Results: fizzle (weak) no ratiomatic data - can't diagnose the fill pressure
Jan 12 1996 11:35:14:740AM	960112014	John Goetz	Shot 960112014: remove 4 msec to prefill puff BR_0 offset = .007 Results: plasma - all the way down good current rise no ratiomatic data again to diagnose prefill NL04 = 1.15e20
Jan 12 1996 11:44:24:070AM	960112015	John Goetz	Shot 960112015: more PG3 volts and NL04 = 1.6e20 Results: fizzle (weak one) radial field 1mT (on 951218 it was 1.5mT)
Jan 12 1996 12:05:08:780PM	960112016	John Goetz	Shot 960112016: remove 2msec from prefill (now 14msec) BR_0 offset = .0075 Results: plasma - disruption @ 1.34 NL04 = 1.5e20, but only after a divertor detachment @ 1.57; then the gas gets in shark fin fill pressure = 0.8e-5
Jan 12 1996 12:11:38:470PM	960112017	John Goetz	Shot 960112017: enable PG2 with 20PSIA deuterium draw 30V square wave on PG2 from .3 to .9 sec Results: fizzle (weak) Bz may need to come in earlier
Jan 12 1996 12:27:04:490PM	960112018	John Goetz	Shot 960112018: IC_EF4 = -1130A Results: plasma - disr. @ 1.34 due to a shark fin no RF again; divertor detachment
Jan 12 1996 12:37:31:770PM	960112019	John Goetz	Shot 960112019: NL04 = 1.9e20 (expect 1.8e20) PG2 volts = 45 Results: fizzle - fields look o.k. - can't read the fill
Jan 12 1996 12:48:06:930PM	960112020	John Goetz	Shot 960112020: no changes Results: fizzle - why??
Jan 12 1996 01:00:39:630PM	960112021	John Goetz	Shot 960112021: BR_0 offset = .0069 Results: plasma - disr. @ 1.21 good current rise only get to requested density at end of discharge
Jan 12 1996 01:10:37:540PM	960112022	John Goetz	Shot 960112022: BR_0 offset = .0064 add 100V pulse to PG2 to make sure the valve opens Results: fizzle - fields look fine
Jan 12 1996 01:23:42:360PM	960112023	John Goetz	Shot 960112023: reload 960112008 - a fiducial Results: plasma - all the way down not the best current rise, but adequate good fiducial
Jan 12 1996 01:33:22:310PM	960112024	John Goetz	Shot 960112024: NL04 = 0.8e20 and less PG3 volts BR_0 offset = .0064 and V_OH1=150V from .005 to .015 Results: fizzle - fields look o.k.
Jan 12 1996 01:51:37:990PM	960112025	John Goetz	Shot 960112025: no changes Results: plasma - all the way down density creeping up during the shot ( wall fueling? )
Jan 12 1996 02:01:07:460PM	960112026	John Goetz	Shot 960112026: remove some PG3 volts (down to 20V) Results: plasma - all the way down NL04 = 0.8 -> 0.9e20
Jan 12 1996 02:10:45:870PM	960112027	John Goetz	Shot 960112027: remove some PG3 volts (down to 10V) NL04 = 0.69e20 Results: plasma - all the way down NL04 = 0.8e20 and fairly constant ELMy H-mode
Jan 12 1996 02:27:14:520PM	960112028	John Goetz	Shot 960112028: PG3 = 0V NL04 = 0.55e20 Results: fizzle (strong) Dalpha just never burns out
Jan 12 1996 02:33:51:210PM	960112029	John Goetz	Shot 960112029: no changes Results: fizzle (strong) Wolfe says Br too negative
Jan 12 1996 02:46:07:620PM	960112030	John Goetz	Shot 960112030: BR_0 offset = .0069 V_OH1 = 170V from .005 to .015 Results: plasma - all the way down NL04 = 0.6e20
Jan 12 1996 02:54:18:390PM	960112031	John Goetz	Shot 960112031: no changes Results: plasma - all the way down NL04 = 0.66e20 RF tried to stay on
Jan 12 1996 03:12:01:610PM	960112032	John Goetz	Shot 960112032: no changes Results: plasma - all the way down ohmic H-mode @ 0.56 (NL04 = 0.66e20 before transition) RF H-modes later
Jan 12 1996 03:12:03:110PM	960112032	John Goetz	Shot 960112032: no changes Results: plasma - all the way down ohmic H-mode @ 0.56 (NL04 = 0.66e20 before transition) RF H-modes later
Jan 12 1996 03:20:23:440PM	960112033	John Goetz	Shot 960112033: disable Argon puff Results: plasma - all the way down NL04 = 0.55e20 no RF
Jan 12 1996 03:33:29:880PM	960112034	John Goetz	Shot 960112034: NL04 = 1e20 and PG3 = 25V Results: plasma - all the way down NL04 = 0.9->1.0e20 0.3MW of RF power (H-mode)
Jan 12 1996 03:43:41:670PM	960112035	John Goetz	Shot 960112035: PG3 = 35V Results: plasma - all the way down RF power = 1.0MW (H-mode)
Jan 12 1996 04:01:02:170PM	960112036	John Goetz	Shot 960112036: no changes Results: plasma - all the way down NL04 => 1.1e20 RF power = 1.5MW
Jan 12 1996 04:27:30:530PM	960112037	John Goetz	Shot 960112037: setup for fiducial PG3 = 30V Results: plasma - all the way down acceptable fiducial
Jan 12 1996 04:48:48:530PM	960112038	John Goetz	Shot 960112038: enable Ar puff (12msec) enable LPI for attempt at PEP-mode Results: fizzle (weak)
Jan 12 1996 04:57:48:130PM	960112039	John Goetz	Shot 960112039: no changes Results: plasma - disr. @ 1.19 no Li pellet

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:41:07:750AM	Test	Ok
2	08:53:04:770AM	Plasma	Ok
3	09:12:28:870AM	Plasma	Ok
4	09:26:51:650AM	Plasma	Ok
5	09:38:35:250AM	Plasma	Ok
6	09:48:34:980AM	Plasma	Ok
7	10:01:04:570AM	Plasma	Ok
8	10:11:18:980AM	Plasma	Ok
9	10:21:36:720AM	Plasma	Ok
10	10:33:54:240AM	Plasma	Ok
11	10:46:50:500AM	Plasma	Ok
12	11:00:48:390AM	Plasma	Ok
13	11:15:06:170AM	Plasma	Ok
14	11:23:43:310AM	Plasma	Ok
15	11:34:51:310AM	Plasma	Ok
16	11:50:25:010AM	Plasma	Ok
17	12:04:54:630PM	Plasma	Ok
18	12:13:11:560PM	Plasma	Ok
19	12:30:47:920PM	Plasma	Ok
20	12:40:44:600PM	Plasma	Ok
21	12:49:49:990PM	Plasma	Ok
22	01:03:34:170PM	Plasma	Ok
23	01:12:13:220PM	Plasma	Ok	No Faults.
24	01:26:59:730PM	Plasma	Ok	comm fault bybass OH2U & OH1
25	01:39:35:900PM	Plasma	Ok
26	01:51:51:060PM	Plasma	Ok	no faults
27	02:02:49:430PM	Plasma	Ok
28	02:14:17:170PM	Plasma	Ok
29	02:25:31:630PM	Plasma	Ok	OH2 Comm. Fault Bypass
30	02:35:36:930PM	Plasma	Ok
31	02:48:15:290PM	Plasma	Ok
32	02:59:11:890PM	Plasma	Ok
33	03:12:44:390PM	Plasma	Ok
34	03:25:30:760PM	Plasma	Ok
35	03:36:38:610PM	Plasma	Ok
36	03:53:28:690PM	Plasma	Ok
37	04:18:07:570PM	Plasma	Ok
38	04:42:53:350PM	Plasma	Ok
39	04:51:25:990PM	Plasma	Ok