Alcator C-Mod Run 980120 Information

Miniproposals

Miniproposal: 133

Date Filed: 12/8/1995

Title: Boronization of Alcator C-Mod

First Author: Jim Terry

Session Leader: Steve Wolfe (shots 1-43)

Operators
Session leader(s):	Steve Wolfe
Physics operator(s):	Ian Hutchinson
Engineering operator(s):	Vinny Bertolino,Bill Cochran

Engineering Operator Run Comment
mp 133 wolfe,hutch,cochran,bertolino

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:17:850PM

Author: To Be Determined

Session Leader summary for 980120, part 1.

MP133: Boronization fiducials
SL: wolfe
PO: hutch
EO: Cochran, Bertolino

The purpose of this part of the run was to evaluate the boronization carried
out on Friday night and do the magic wall conditioning usually required after
a fresh boronization. The plan was to start with fiducial shots (800kA, RF in
two steps at 1MW and 2MW.) and then to take a few 1MA shots for a more direct
comparison with the previous weeks' results. This was accomplished.

A fresh boronization was carried out over the weekend. 137 psi of diborane was
used, for an average coverage of about 2000 Angstroms. This boronization
processed the most diborane ever used during a single C-Mod boronization. In
addition, we scanned the ECDC resonance out past the Faraday shield midplane
location to just behind the current strap. Previous boronizations during this
run campaign have been limited to just up to the Faraday shield.

Breakdown was extremely problematic at the start of the day. Ian made
substantial changes to the startup segment, including tweaks to OH1, OH2, EF1,
and EF3 voltages, as well as RCUR offset, IC_EF4 and Br0. The first non-fizzle
was shot 17, at about 11:45AM. The new startup has a rather slow initial
current rise, but seemed quite robust once we got going.

NOTE: The ratiomatic response has apparently changed. We got about a factor of
two lower pressure on the f-side ratiomatic for the standard pre-puff. John
Goetz confirmed that the ratio of the divertor RGA signal to the ratiomatic on
a fizzle was different today from 980116037.

Shots 17 and 21-25 were 800kA fiducials with no Argon. The L-H transition
moved from 1sec on shot 17 to earlier and earlier in the 1MW step. All shots
got into EDA shortly after the LH transition. The 2MW step of the 800kA shots
peaked out at 115-120kJ Wmhd. Except for injections, the 2pi on these shots
was typically 200kW, and the main bolo around 600kW.

On shot 26, and thereafter, the Argon pulse was enabled, (20msec @1psi) and
the 2pi increased by about 100kW. The L-H was delayed and the EDA didn't come
on until .94sec. The Mo signal (ch 2 of the Moly-monitor) went from 7.6e13 on
shot 25 to 1.2e14 on shot 26. The stored energy was not significantly affected
at 114kJ.

Shots 27-28 were at 1MA, with everything else nominally the same. Argon was
left on. The 1MA shots did not go into H-mode until the second RF step,
perhaps indicating a current dependence on Pthresh. Shot 27 got to stored
energy of 160kJ, which is very similar to 1MA shots of the previous two
weeks. Shot 28 had a large injection, up to 1.6e15 on the Mo monitor, and
raised the bolometer Prad to 1.5MW and cooled the plasma noticeably. Wmhd only
reached 150kJ on this shot.

Moly levels, aside from injections, seem down from last week. However, the
stored energy and confinement seem quite similar, and lower than in 1996.

After shot 28, the run was turned over to Bob Granetz for MP#173B,
inside/outside fueling.

Entered: Jul 7 2004 03:49:17:867PM

Author: To Be Determined

Run summary for 980120_B

MP 173B -- Compare high-field side and low-field side gas fueling

SL: Granetz
PO: Hutchinson

Summary: We gas puffed deuterium into a limited plasma from both the high-field
side and the low-field side, and even though the quality of the data is not
great, we can conclude that gas fueling into the high-field side does NOT show
any enhanced fueling efficiency compared to the low-field side. The actual
density rises were rather miniscule, and the absolute fueling efficiencies may
be affected by marfe activity, but the comparative null result is clear. Shots
to look at are 32 (inboard w/o puff), 34 & 35 (inboard w/puff), 37 (outboard
w/o puff), 40 & 42 (outboard w/puff). No deleterious effects of running on the
outboard limiter for 0.4 s were noticed.

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

This half-day run is beginning at 14:05, with 980120029 as the first shot. It
will be an 0.8 MA, 5.3 T, ohmic shot, limited on the inboard wall from t=0.7 to
1.2 s. We'd like to get an elongation of 1.45, but don't know how to set that
up a priori, so let's see what we get on the first shot and adjust from there.

The lower divertor NINJA has been filled to approximately 35 psi of D2. (It
is used for both the inboard midplane capillary and the outboard midplane (A-B
limiter) capillary.

Shot 29 -- Fizzle.

Shot 30 -- Plasma. Just barely limited from t=0.8 to 1.3 s. Kappa=1.55.
Next shot: push up farther against the inboard limiter. This should
also reduce the elongation.

Shot 31 -- Fizzle.

Shot 32 -- Plasma. Good inboard-limited plasma. Kappa=1.3. Density flattops
at nl04=1.4e20 m-2 by t=0.95 s. Gas valve is off during the limited
portion of the discharge.

Next shot: fire inboard midplane NINJA valve (B16-001) from t=0.95
to 1.05 s.

Shot 33 -- Fizzle.

Shot 34 -- Plasma. Good inboard-limiter plasma with inboard NINJA puffing.
Density rise is noticeable starting around t=1.05 s. Total plasma
particles increase by only 0.13e20. Brian says that he is injecting
a total of 21 torr-litres of D2, which corresponds to about 15e20
atoms. Initial injection rate is about 105e20 atoms per second;
initial plasma particle rise is approx 2e20 ions/s. JT reports that
the marfe Te is 1.1 ev (determined from slope of radiative
recombination continuum of neutral deuterium).

Next shot: repeat with no changes.

Shot 35 -- Plasma. Another good inboard-limiter, inboard fueling shot.
Very similar results.

Next shot: same, except no NINJA puffing, to get a 2nd background
shot.

Shot 36 -- Fizzle.

Next shot: run an outboard-limited plasma. No NINJA puffing.

Shot 37 -- Plasma. Good outboard-limited plasma. There apparently was still
a marfe, with accompanying density increase, just like there was on
the previous inboard-limited shots. Inner gap is 1 cm. Kappa=1.4.

Next shot: puff from the NINJA A-B outboard midplane capillary
(A33-001). No puff from the inboard capillary.

Shot 38 -- Fizzle.

Shot 39 -- Fizzle.

Shot 40 -- Plasma. Good outboard-limited plasma with outboard puffing.
Density starts increasing at t=1.05 s (same as inboard cases) at
the same rate of rise as the inboard case. However, the total
number of particles continues rising, eventually reaching about 3
times more increase on this shot than on the inboard shots (035).

Next shot: repeat, again with outboard puffing.

Shot 41 -- Fizzle.

Shot 42 -- Plasma. Good outboard-limited plasma with outboard puffing. Very
similar to previous shot (040).

Next shot: repeat, with no puffing.

Shot 43 -- Plasma. Good outboard-limited shot with no NINJA puffing.
Unfortunately, nl04 digitiser failed.

End of run. Later this evening, Brian will run a couple of gas calibration
shots to absolutely calibrate the inboard and outboard NINJA injections.

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

From: SOL::CSP "C. S. Pitcher" 20-JAN-1998 19:43:23.93
To: GRANETZ,LABOMBARD,WOLFE,HUTCH
CC:
Subj: AB limiter puffing vs inner wall

Hi Bob,

I've analyzed the gas puff tests 2082 (AB limiter) and 2083 (inner wall).

The peak flow rates are approx 75 Torr l /s and 93 Torr l /s, respectively.

Somewhat higher for the inner wall. We didn't do enough tests
to see how reproducible the ninja system is, but my feeling
is that this difference is real, and probably reflects the different
length capillaries and/or some pinch of the capillaries somewhere.

Spencer

Physics Operator Summaries

Entered: Jul 7 2004 04:36:58:833PM

Author: To Be Determined

Physop Summary 980120. Post Boronization plus MP173B
____________________________________________________

Inboard-outboard fueling
________________________

PO Hutch
SL Wolfe,Granetz

Summary
_______

Got plasmas back but not with perfect reliability.
Demonstrated the null hypothesis for inboard outboard ninja fueling.

Physop Stuff
____________

Started up with a long series of fizzles. Then eventually slowed the
Bz ramp rate a lot and finally got a series of 8 plasmas. Then things
reverted to alternating fizzles. The Bz was irreproducible at the 2mT
level. Current rise was generally very slow, and sometimes the
breakdown time was variable. Tweaked at improving the mflux shape.
Need to increase the EF1 commutation resistors to go where I really
wanted to.

Ratiomatic was giving pressures about a factor of 2 lower than before
for the same gas puff. We believe its calibration has changed but this
is not 100% certain. Densities in the first 30ms were very high, over
1e19 in many cases, versus typically 0.5 previously.

Plasmas had very low Mo and radiation in fiducials, but not
particularly spectacular confinement. Still it is clear that this
boronization was very effective in removing Mo at 2MW of RF.
It took only about 5 plasmas to cycle into a more or less steady
state.

No disruptions today. Sorry Bob!

Scorecard
_________

Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax
1 0.000 0.018 2 0.000 0.027
3 0.000 0.027 4 0.000 0.005
5 0.000 0.027 6 0.000 0.032
7 0.000 0.027 8 0.000 0.027
9 0.000 0.027 10 0.000 0.027
11 0.000 0.027 12 0.000 0.027
13 0.000 0.027 14 0.000 0.027
15 0.000 0.027 16 0.000 0.027
17 1.667 0.843 18 0.000 0.027
19 0.000 0.032 20 0.000 0.037
21 1.668 0.843 22 1.671 0.843
23 1.667 0.843 24 1.663 0.843
25 1.668 0.843 26 1.664 0.843
27 1.604 1.040 28 1.614 1.040
29 0.000 0.027 30 1.602 0.838
31 0.000 0.037 32 1.671 0.833
33 0.000 0.037 34 1.627 0.833
35 1.638 0.833 36 0.000 0.027
37 1.669 0.838 38 0.000 0.037
39 0.000 0.032 40 1.666 0.838
41 0.000 0.032 42 1.661 0.833
43 1.666 0.833
Finished summary for 980120 Total of 43 shots.
43 shots. 17 plasmas. 26 fizzles. 1 ps test.
Fizzle = gt 27 lt 50kA.

Details
_______

-----------------------------------------------------------------------------
980120xxx HUTCH PHYSICS_OPERATOR 20-JAN-1998 10:24:15.77
. . . . . . . . . . . . . . . . . . . .
Boronized over the weekend with He discharge cleaning for a couple of days.
No D2 ECDC. So this is a startup with a boronized, heliumized machine.
-----------------------------------------------------------------------------
980120002 HUTCH PHYSICS_OPERATOR 20-JAN-1998 09:13:16.40
. . . . . . . . . . . . . . . . . . . .
Cold start
Used the settings from end of last week turned on segment 4 fiducial.

Fizzle. Very low fill pressure: .022 mtorr. Very fast current rise.
Breakdown a bit late, 7.5ms. Fill puff was only 14ms.

Fill puff to 18 ms.
--------------------------------------------------------------------------------
980120003 HUTCH PHYSICS_OPERATOR 20-JAN-1998 09:23:10.41
. . . . . . . . . . . . . . . . . . . .
Fizzle. Breakdown later 9ms. pressure .03mtorr. Much slower current rise.

Repeat.
--------------------------------------------------------------------------------
980120004 HUTCH PHYSICS_OPERATOR 20-JAN-1998 09:31:24.92
. . . . . . . . . . . . . . . . . . . .
Magnet resistance Fault.
--------------------------------------------------------------------------------
980120005 HUTCH PHYSICS_OPERATOR 20-JAN-1998 09:41:13.44
. . . . . . . . . . . . . . . . . . . .
Fizzle. Earlier breakdown, 6ms. More light.

Import segment 1 from 980107025. Gas fill puff to 20 ms.
Br offset is 6mT versus 5.5 before.
--------------------------------------------------------------------------------
980120006 HUTCH PHYSICS_OPERATOR 20-JAN-1998 09:50:41.32
. . . . . . . . . . . . . . . . . . . .
Fizzle. Breakdown at 5ms.

Lower Br offset to 5mT
--------------------------------------------------------------------------------
980120007 HUTCH PHYSICS_OPERATOR 20-JAN-1998 09:57:09.66
. . . . . . . . . . . . . . . . . . . .
Fizzle. Simlar, with a longer pause before dying.

OH1 to 0V at 5ms from +100, OH2 to -20 from 0.
--------------------------------------------------------------------------------
980120008 HUTCH PHYSICS_OPERATOR 20-JAN-1998 10:12:07.01
. . . . . . . . . . . . . . . . . . . .
Fizzle. Slower current rise because the Bz initially was less, despite my changes.
Just irreproducibility.

Fill puff to 25ms.
--------------------------------------------------------------------------------
980120009 HUTCH PHYSICS_OPERATOR 20-JAN-1998 10:17:00.44
. . . . . . . . . . . . . . . . . . . .
Fizzle. Bz still a little low initially. Slow current rise. .045mtorr.

EF4 to -1335 from -1345.
--------------------------------------------------------------------------------
980120010 HUTCH PHYSICS_OPERATOR 20-JAN-1998 10:21:36.78
. . . . . . . . . . . . . . . . . . . .
Fizzle. Not much change visible to Bz. 0.045mtorr. Very similar.

Fill puff to 30ms.
--------------------------------------------------------------------------------
980120011 HUTCH PHYSICS_OPERATOR 20-JAN-1998 10:36:53.04
. . . . . . . . . . . . . . . . . . . .
Fizzle. Slightly lower current. Breakdown at 5ms. 0.052 mtorr.

Fill puff to 15ms. Ratiomatic does not seem consistent with the puff.
--------------------------------------------------------------------------------
980120012 HUTCH PHYSICS_OPERATOR 20-JAN-1998 10:47:45.59
. . . . . . . . . . . . . . . . . . . .
Fizzle. Did I load that? 10:27 was last. Yes .024mtorr. Later breakdown. 8ms.

Fill puff back to 25ms.
OH1 V to 40 V at 5ms. Trying a field index tweak.
--------------------------------------------------------------------------------
980120013 HUTCH PHYSICS_OPERATOR 20-JAN-1998 10:57:10.37
. . . . . . . . . . . . . . . . . . . .
Fizzle. .045 mtorr.

OH1 V to 80V at 5ms.
Rcur offset to 5300 from 6300.
--------------------------------------------------------------------------------
980120014 HUTCH PHYSICS_OPERATOR 20-JAN-1998 11:19:51.67
. . . . . . . . . . . . . . . . . . . .
Fizzle.

Lower EF3 Voltage to 1500 from 2000 at 12ms.
EF1 to +200V at 2ms.
--------------------------------------------------------------------------------
980120015 HUTCH PHYSICS_OPERATOR 20-JAN-1998 11:29:08.60
. . . . . . . . . . . . . . . . . . . .
Long data system hang
Fizzle. Bz initial increases to nearly zero. Slower current rise.

Repeat.
--------------------------------------------------------------------------------
980120016 HUTCH PHYSICS_OPERATOR 20-JAN-1998 11:37:18.57
. . . . . . . . . . . . . . . . . . . .
Fizzle.

Raise OH1 V by about 70V from 5ms to 15ms.
--------------------------------------------------------------------------------
980120017 HUTCH PHYSICS_OPERATOR 20-JAN-1998 11:50:39.74
. . . . . . . . . . . . . . . . . . . .
Plasma. At last!
This has a much slower Bz ramp rate after 10ms, which it likes.
Initial density is 7e18: high. .045mtorr: low ratiomatic fill, 25ms puff.
H-mode at 2MW.

Repeat.
--------------------------------------------------------------------------------
980120018 HUTCH PHYSICS_OPERATOR 20-JAN-1998 11:59:30.14
. . . . . . . . . . . . . . . . . . . .
Fiz. Bz drops arbitrarily from previous shot.

EF4 to -1325A
--------------------------------------------------------------------------------
980120019 HUTCH PHYSICS_OPERATOR 20-JAN-1998 12:08:55.33
. . . . . . . . . . . . . . . . . . . .
Fiz.

Fill to 20ms.
--------------------------------------------------------------------------------
980120020 HUTCH PHYSICS_OPERATOR 20-JAN-1998 12:25:55.72
. . . . . . . . . . . . . . . . . . . .
Fiz. Got to 45kA. Breakdown at 7.4ms. .037 mtorr.

Fill to 22ms, EF1s to 300V at 2ms.
--------------------------------------------------------------------------------
980120021 HUTCH PHYSICS_OPERATOR 20-JAN-1998 12:33:32.93
. . . . . . . . . . . . . . . . . . . .
Plasma. Good radiation control during H-mode.

Br offset to 4.5 from 5mT.
--------------------------------------------------------------------------------
980120022 HUTCH PHYSICS_OPERATOR 20-JAN-1998 12:47:19.53
. . . . . . . . . . . . . . . . . . . .
Plasma. 2 in a row. Serious hesitation. Late breakdown: .85ms.
B_r lower itself so now it is a bit low.
H-mode at 1MW.

Repeat.
--------------------------------------------------------------------------------
980120023 HUTCH PHYSICS_OPERATOR 20-JAN-1998 13:00:17.29
. . . . . . . . . . . . . . . . . . . .
Plasma.
H-mode EDA at 1MW.

Add a point on the EF1 trace at 250V, 20ms.
--------------------------------------------------------------------------------
980120024 HUTCH PHYSICS_OPERATOR 20-JAN-1998 13:13:59.76
. . . . . . . . . . . . . . . . . . . .
Plasma. A significant injection at 1.2s.
--------------------------------------------------------------------------------
980120025 HUTCH PHYSICS_OPERATOR 20-JAN-1998 13:28:06.05
. . . . . . . . . . . . . . . . . . . .
Plasma.

Enable Argon. Copy seg4 to seg 2. Use seg 2. 20ms Ar puff.
--------------------------------------------------------------------------------
980120025 HUTCH PHYSICS_OPERATOR 20-JAN-1998 13:42:02.70
. . . . . . . . . . . . . . . . . . . .
Plasma. Prad higher. Mo also increased.

Ip to 1MA.
--------------------------------------------------------------------------------
980120027 HUTCH PHYSICS_OPERATOR 20-JAN-1998 13:58:21.54
. . . . . . . . . . . . . . . . . . . .
Plasma. Breakdown at 7.5ms. H-mode at 2MA.

Repeat.
--------------------------------------------------------------------------------
980120028 HUTCH PHYSICS_OPERATOR 20-JAN-1998 14:19:02.15
. . . . . . . . . . . . . . . . . . . .
Plasma. Big injection during RF.

Switch to inboard ninja injection program.
Load seg 2 from 980120026 0.8MA.
Draw clearin from (.7,-.008) to (.8,-.03) and leave in. To touch inboard.
Draw rcur (.7,.669) to (.8,.662) 7mm motion to avoid touching outboard.
--------------------------------------------------------------------------------
980120029 HUTCH PHYSICS_OPERATOR 20-JAN-1998 14:27:55.92
. . . . . . . . . . . . . . . . . . . .
Fizzle. Breakdown at 11 ms!

EF4 to -1335.
--------------------------------------------------------------------------------
980120030 HUTCH PHYSICS_OPERATOR 20-JAN-1998 14:44:15.25
. . . . . . . . . . . . . . . . . . . .
Plasma. Not limited enough. There is a nearly 2cm offset in the hybrid clearin.
Outer gap is well maintained at 1.5cm.

Call clearin predictor.
Set clearin to -5cm.
--------------------------------------------------------------------------------
980120031 HUTCH PHYSICS_OPERATOR 20-JAN-1998 14:57:42.28
. . . . . . . . . . . . . . . . . . . .
Fizzle. Late breakdown. B_z is high again.

Fill puff to 24ms from 22.
--------------------------------------------------------------------------------
980120032 HUTCH PHYSICS_OPERATOR 20-JAN-1998 15:06:22.78
. . . . . . . . . . . . . . . . . . . .
Plasma. No change to predictor offset.
Solidly limited. Granetz is happy.

Repeat.
--------------------------------------------------------------------------------
980120033 HUTCH PHYSICS_OPERATOR 20-JAN-1998 15:15:41.49
. . . . . . . . . . . . . . . . . . . .
Fiz. Later breakdwon. 7.5ms.

EF4 to -1340.
--------------------------------------------------------------------------------
980120034 HUTCH PHYSICS_OPERATOR 20-JAN-1998 15:31:16.35
. . . . . . . . . . . . . . . . . . . .
Plasma. Breakdown at 6.1ms.
An interesting radiating/recombining region is seen on the TV
It appears to be the converse of the flux surfaces that connect to
the outboard midplane.

Repeat
--------------------------------------------------------------------------------
980120035 HUTCH PHYSICS_OPERATOR 20-JAN-1998 15:44:42.29
. . . . . . . . . . . . . . . . . . . .
Plasma.

Repeat
--------------------------------------------------------------------------------
980120036 HUTCH PHYSICS_OPERATOR 20-JAN-1998 15:58:26.35
. . . . . . . . . . . . . . . . . . . .
Fiz.

Move to outer limiter.
Rcur to .675, Clearin to -3cm. zxl to -.03m.
Fill to 20ms.
--------------------------------------------------------------------------------
980120037 HUTCH PHYSICS_OPERATOR 20-JAN-1998 16:12:49.42
. . . . . . . . . . . . . . . . . . . .
Plasma. Outboard limited as requested.

Repeat.
--------------------------------------------------------------------------------
980120038 HUTCH PHYSICS_OPERATOR 20-JAN-1998 16:18:43.14
. . . . . . . . . . . . . . . . . . . .
Fiz. Faster current rise leads to bounce on the outboard.

Fill to 22ms.
--------------------------------------------------------------------------------
980120039 HUTCH PHYSICS_OPERATOR 20-JAN-1998 16:27:24.49
. . . . . . . . . . . . . . . . . . . .
Fizzle.

OH2V to 0 from 20V at .01s.
--------------------------------------------------------------------------------
980120040 HUTCH PHYSICS_OPERATOR 20-JAN-1998 16:41:48.91
. . . . . . . . . . . . . . . . . . . .
Plasma. With ninja puff outboard.

OH2s to -10V at 7ms.
--------------------------------------------------------------------------------
980120041 HUTCH PHYSICS_OPERATOR 20-JAN-1998 16:55:48.68
. . . . . . . . . . . . . . . . . . . .
Fizzle.

OH1 to 125V at 5ms.
--------------------------------------------------------------------------------
980120042 HUTCH PHYSICS_OPERATOR 20-JAN-1998 16:59:47.92
. . . . . . . . . . . . . . . . . . . .
Plasma.

OH1 down to125V till 10ms.
--------------------------------------------------------------------------------
980120043 HUTCH PHYSICS_OPERATOR 20-JAN-1998 17:04:09.05
. . . . . . . . . . . . . . . . . . . .
Plasma.

Session Leader Comments

Jan 20 1998 09:14:06:590AM Steve Wolfe Run Plan for Tuesday, 980120 (first part)

MP133 Boronization fiducials
SL wolfe
PO hutch

ECDC in He from end of boronization untl two hors before run

Engineering setup as on 980107031, TF under hybrid control
Gas setup-
K-side 30psi D2, hybrid enable
B-top 6psi D2, hybrid enable
B-side,lower 1psi Ar, hybrid no enabled

Start with ususal Tuesday test
Run fiducials until plasmas are reproducible,
evaluate H-mode quality. Extend second RF pulse (2MW level) to end of
flattop.

If we are getting EDA h-modes, then increase current to 1MA, check confinement.

If there is enough time, begin MP173B, Inside/outside fueling (Granetz as SL).

Jan 20 1998 08:58:22:630AM 980120001 Steve Wolfe Shot 1: Tuesday OH test. OK. Oscillations on OH2U during charge.

Jan 20 1998 09:12:45:850AM 980120002 Steve Wolfe Shot 2: First plasma attempt. fizzle.

Jan 20 1998 09:23:09:140AM 980120003 Steve Wolfe Shot 3: Raise fill and try again.
fizzle. bd even later.

Jan 20 1998 09:26:04:600AM 980120004 Steve Wolfe Shot 4: Repeat. Magnet resistance fault.

Jan 20 1998 09:36:45:120AM 980120005 Steve Wolfe Shot 5: Repeat. Another fizzle. Earlier breakdown, got some density (6e18) this time.
CII level still small. F-side pressure still reads low (.03mTorr), despite 18msec on B-top pulse.

Try reverting to an older startup segment.

Jan 20 1998 09:46:11:510AM 980120006 Steve Wolfe Shot 6: change seg 1 to one from 980107025
fizzle. ratiomatic still reads low .032mTorr for 20msec puff.

Jan 20 1998 09:50:20:610AM 980120007 Steve Wolfe Shot 7: Br tweak. Fizzle.

Next shot, try some oh voltage tweaks.

Jan 20 1998 10:00:53:410AM 980120008 Steve Wolfe Shot 8: V_oh1 and V_oh2 tweaks to increase Bzdot.
fizzle. initial Bz seems more negative.
f-side now at .035mTorr (no change to puff).

Jan 20 1998 10:13:48:890AM 980120009 Steve Wolfe Shot 9: increase gas puff.
fizzle.

Jan 20 1998 10:19:48:960AM 980120010 Steve Wolfe Shot 10: EF4 tweak. fizzle.

next, Raise the gas some more (to 30msec).

Jan 20 1998 10:29:19:970AM 980120011 Steve Wolfe Shot 11: Raise pre-puff to 30msec.
fizzle. Got .052mTorr on ratiomatic, slightly lower density.
That didn't do it, so now lower it.

Jan 20 1998 10:40:17:440AM 980120012 Steve Wolfe Shot 12: Drop pre-puff to 15 msec.
fizzle. later bd. F-side down to .024

Jan 20 1998 10:52:03:000AM 980120013 Steve Wolfe Shot 13: fill back to 25msec. Tweak V_oh1 more positive.
fizzle. .045 on ratiomatic.

Jan 20 1998 11:01:44:390AM 980120014 Steve Wolfe Shot 14: More of a v-oh1 tweak, and reduce rcur offset from 6300 ->5300.
somewhat longer fizzle.

Jan 20 1998 11:24:03:090AM 980120015 Steve Wolfe Shot 15: Lower EF3 voltage after 10msec. and change EF1 voltage.
fizzle. later bd. Bz and Br both higher at t=0. There was a long wait for computer hang before
this shot.

Jan 20 1998 11:29:39:890AM 980120016 Steve Wolfe Shot 16: repeat.
fizzles are quite reproducible.

Jan 20 1998 11:43:01:240AM 980120017 Steve Wolfe Shot 17: Try something drastic. Increase V_oh1 by 70V.
plasma to 1.67 sec, EDA H-mode at 1sec (nominal 2MW step).

Jan 20 1998 11:50:36:700AM 980120018 Steve Wolfe Shot 18: Repeat. fizzle.

Jan 20 1998 12:01:24:030PM 980120019 Steve Wolfe Shot 19: EF4 to -1325
back to fizzles.

Jan 20 1998 12:20:16:250PM 980120021 Steve Wolfe Shot 20: pre-puff to 20msec
fizzle. Almost went; got to 45kA.

Jan 20 1998 12:34:21:950PM 980120021 Steve Wolfe Shot 21: pre-puff to 22msec, tweak EF1's again.
plasma to 1.67sec, EDA H-mode at 1sec, dithering during 1MW step.
No faults on RF this time.
W=120kJ

Jan 20 1998 12:38:40:330PM 980120022 Steve Wolfe Shot 22: decrease Br to .0045
plasma - 2 in a row! long hesitation, but it made it.
L-H during the 1MW step this time.
W=115kJ.

Jan 20 1998 12:53:05:670PM 980120023 Steve Wolfe Shot 23: Repeat. plasma.
L-H at .795, short ELM-free period, then EDA at .83sec.
W=114kJ

Jan 20 1998 01:05:33:000PM 980120024 Steve Wolfe Shot 24: Tweak seg 1 EF1's again.
plasma. L-H at .83 and EDA at .87
Big injection at 1.2sec, when the Rf turns off.

Jan 20 1998 01:19:51:770PM 980120025 Steve Wolfe Shot 25: repeat.
plasma - LH at .797, EDA at .825
No injection this time, except an early one at .22sec. 2pi at 200kW, bolo = 600kW.
W= 115kJ

Jan 20 1998 01:34:47:900PM 980120026 Steve Wolfe Shot 26: Add some Argon for JR. 20msec at 1psi.
plasma. Dithers longer before H-mode, .91, EDA @ .937
prad 2pi = 290kW, bolo = 720kW
W=114kJ. Mo signal nearly doubles 7.6e13 -> 1.2e14 at 1.2sec

Jan 20 1998 01:48:25:380PM 980120027 Steve Wolfe Shot 27: Go to 1MA. Take out previous Br tweak.
plasma to 1.6sec.
H-mode starts at 1sec (2nd step)
nl4 goes to 2.24e20/m2.
injection when RF turns off; 2pi goes from 400kW to 500kW, bolo=1MW
W = 160kJ.

Jan 20 1998 02:03:47:540PM 980120028 Steve Wolfe Shot 28: repeat, with some rf tweaks.
plasma. L-H at 1sec, injection during RF, cools things down.
W=150kJ. 2pi to 800kW, bolo to 1.8MW.
Mo monitor (ch 2) to 1.6e15

Jan 20 1998 02:17:11:210PM 980120029 Robert Granetz MP 173B -- Compare high-field side and low-field side gas fueling

SL: Granetz
PO: Hutchinson

This half-day run is beginning at 14:05, with 980120029 as the first shot. It
will be an 0.8 MA, 5.3 T, ohmic shot, limited on the inboard wall from t=0.7 to
1.2 s. We'd like to get an elongation of 1.45, but don't know how to set that
up a priori, so let's see what we get on the first shot and adjust from there.

The lower divertor NINJA has been filled to approximately 35 psi of D2. (It
is used for both the inboard midplane capillary and the outboard midplane (A-B
limiter) capillary.

Jan 20 1998 02:35:24:050PM 980120030 Robert Granetz Shot 30 -- Plasma. Just barely limited from t=0.8 to 1.3 s. Kappa=1.55.
Next shot: push up farther against the inboard limiter. This should
also reduce the elongation.

Jan 20 1998 03:02:18:180PM 980120032 Robert Granetz Shot 32 -- Plasma. Good inboard-limited plasma. Kappa=1.3. Density flattops
at nl04=1.4e20 m-2 by t=0.95 s. Gas valve is off during the limited
portion of the discharge.

Next shot: fire inboard midplane NINJA valve (B16-001) from t=0.95
to 1.05 s.

Jan 20 1998 04:48:40:350PM 980120034 Robert Granetz Shot 34 -- Plasma. Good inboard-limiter plasma with inboard NINJA puffing.
Total plasma particles increase by only 0.13e20. Brian says that
he is injecting a total of 21 torr-litres of D2, which corresponds
to about 15e20 atoms. Initial injection rate is about 105e20 atoms
per second; initial plasma particle rise is approx 2e20 ions/s.
JT reports that the marfe Te is 1.1 ev (determined from slope of
radiative recombination continuum of neutral deuterium).

Next shot: repeat with no changes.

Jan 20 1998 03:46:55:310PM 980120035 Robert Granetz Shot 35 -- Plasma. Another good inboard-limiter, inboard fueling shot.
Very similar results.

Next shot: same, except no NINJA puffing, to get a 2nd background
shot.

Jan 20 1998 03:53:14:830PM 980120036 Robert Granetz Shot 36 -- Fizzle.

Next shot: run an outboard-limited plasma. No NINJA puffing.

Jan 20 1998 04:06:54:850PM 980120037 Robert Granetz Shot 37 -- Plasma. Good outboard-limited plasma. There apparently was still
a marfe, with accompanying density increase, just like there was on
the previous inboard-limited shots. Inner gap is 1 cm. Kappa=1.4.

Next shot: puff from the NINJA A-B outboard midplane capillary
(A33-001). No puff from the inboard capillary.

Jan 20 1998 04:37:59:770PM 980120040 Robert Granetz Shot 40 -- Plasma. Good outboard-limited plasma with outboard puffing.
Density starts increasing at t=1.05 s (same as inboard cases) at
the same rate of rise as the inboard case. However, the total
number of particles continues rising, eventually reaching about 3
times more increase on this shot than on the inboard shots (035).

Next shot: repeat, again with outboard puffing.

Jan 20 1998 04:53:15:550PM 980120042 Robert Granetz Shot 42 -- Plasma. Good outboard-limited plasma with outboard puffing. Very
similar to previous shot (040).

Next shot: repeat, with no puffing.

Jan 20 1998 05:01:54:890PM 980120043 Robert Granetz Shot 43 -- Plasma. Good outboard-limited shot with no NINJA puffing.
Unfortunately, nl04 digitiser failed.

End of run. Later this evening, Brian will run a couple of gas calibration
shots to absolutely calibrate the inboard and outboard NINJA injections.

Physics Operator Comments

Jan 20 1998 10:24:15:770AM Ian Hutchinson Boronized over the weekend with He discharge cleaning for a couple of days.
No D2 ECDC. So this is a startup with a boronized, heliumized machine.

Jan 20 1998 09:13:16:400AM 980120002 Ian Hutchinson Cold start
Used the settings from end of last week turned on segment 4 fiducial.

Fizzle. Very low fill pressure: .022 mtorr. Very fast current rise.
Breakdown a bit late, 7.5ms. Fill puff was only 14ms.

Fill puff to 18 ms.

Jan 20 1998 09:23:10:410AM 980120003 Ian Hutchinson Fizzle. Breakdown later 9ms. pressure .03mtorr. Much slower current rise.

Repeat.

Jan 20 1998 09:31:24:920AM 980120004 Ian Hutchinson Magnet resistance Fault.

Jan 20 1998 09:41:13:440AM 980120005 Ian Hutchinson Fizzle. Earlier breakdown, 6ms. More light.

Import segment 1 from 980107025. Gas fill puff to 20 ms.
Br offset is 6mT versus 5.5 before.

Jan 20 1998 09:50:41:320AM 980120006 Ian Hutchinson Fizzle. Breakdown at 5ms.

Lower Br offset to 5mT

Jan 20 1998 09:57:09:660AM 980120007 Ian Hutchinson Fizzle. Simlar, with a longer pause before dying.

OH1 to 0V at 5ms from +100, OH2 to -20 from 0.

Jan 20 1998 10:12:07:010AM 980120008 Ian Hutchinson Fizzle. Slower current rise because the Bz initially was less, despite my changes.
Just irreproducibility.

Fill puff to 25ms.

Jan 20 1998 10:17:00:440AM 980120009 Ian Hutchinson Fizzle. Bz still a little low initially. Slow current rise. .045mtorr.

EF4 to -1335 from -1345.

Jan 20 1998 10:21:36:780AM 980120010 Ian Hutchinson Fizzle. Not much change visible to Bz. 0.045mtorr. Very similar.

Fill puff to 30ms.

Jan 20 1998 10:36:53:040AM 980120011 Ian Hutchinson Fizzle. Slightly lower current. Breakdown at 5ms. 0.052 mtorr.

Fill puff to 15ms. Ratiomatic does not seem consistent with the puff.

Jan 20 1998 10:47:45:590AM 980120012 Ian Hutchinson Fizzle. Did I load that? 10:27 was last. Yes .024mtorr. Later breakdown. 8ms.

Fill puff back to 25ms.
OH1 V to 40 V at 5ms. Trying a field index tweak.

Jan 20 1998 10:57:10:370AM 980120013 Ian Hutchinson Fizzle. .045 mtorr.

OH1 V to 80V at 5ms.
Rcur offset to 5300 from 6300.

Jan 20 1998 11:19:51:670AM 980120014 Ian Hutchinson Fizzle.

Lower EF3 Voltage to 1500 from 2000 at 12ms.
EF1 to +200V at 2ms.

Jan 20 1998 11:29:08:600AM 980120015 Ian Hutchinson Long data system hang
Fizzle. Bz initial increases to nearly zero. Slower current rise.

Repeat.

Jan 20 1998 11:37:18:570AM 980120016 Ian Hutchinson Fizzle.

Raise OH1 V by about 70V from 5ms to 15ms.

Jan 20 1998 11:50:39:740AM 980120017 Ian Hutchinson Plasma. At last!
This has a much slower Bz ramp rate after 10ms, which it likes.
Initial density is 7e18: high. .045mtorr: low ratiomatic fill, 25ms puff.
H-mode at 2MW.

Repeat.

Jan 20 1998 11:59:30:140AM 980120018 Ian Hutchinson Fiz. Bz drops arbitrarily from previous shot.

EF4 to -1325A

Jan 20 1998 12:08:55:330PM 980120019 Ian Hutchinson Fiz.

Fill to 20ms.

Jan 20 1998 12:25:55:720PM 980120020 Ian Hutchinson Fiz. Got to 45kA. Breakdown at 7.4ms. .037 mtorr.

Fill to 22ms, EF1s to 300V at 2ms.

Jan 20 1998 12:33:32:930PM 980120021 Ian Hutchinson Plasma. Good radiation control during H-mode.

Br offset to 4.5 from 5mT.

Jan 20 1998 12:47:19:530PM 980120022 Ian Hutchinson Plasma. 2 in a row. Serious hesitation. Late breakdown: .85ms.
B_r lower itself so now it is a bit low.
H-mode at 1MW.

Repeat.

Jan 20 1998 01:00:17:290PM 980120023 Ian Hutchinson Plasma.
H-mode EDA at 1MW.

Add a point on the EF1 trace at 250V, 20ms.

Jan 20 1998 01:13:59:760PM 980120024 Ian Hutchinson Plasma. A significant injection at 1.2s.

Jan 20 1998 01:28:06:050PM 980120025 Ian Hutchinson Plasma.

Enable Argon. Copy seg4 to seg 2. Use seg 2. 20ms Ar puff.

Jan 20 1998 01:42:02:700PM 980120025 Ian Hutchinson Plasma. Prad higher. Mo also increased.

Ip to 1MA.

Jan 20 1998 01:58:21:540PM 980120027 Ian Hutchinson Plasma. Breakdown at 7.5ms. H-mode at 2MA.

Repeat.

Jan 20 1998 02:19:02:150PM 980120028 Ian Hutchinson Plasma. Big injection during RF.

Switch to inboard ninja injection program.
Load seg 2 from 980120026 0.8MA.
Draw clearin from (.7,-.008) to (.8,-.03) and leave in. To touch inboard.
Draw rcur (.7,.669) to (.8,.662) 7mm motion to avoid touching outboard.

Jan 20 1998 02:27:55:920PM 980120029 Ian Hutchinson Fizzle. Breakdown at 11 ms!

EF4 to -1335.

Jan 20 1998 02:44:15:250PM 980120030 Ian Hutchinson Plasma. Not limited enough. There is a nearly 2cm offset in the hybrid clearin.
Outer gap is well maintained at 1.5cm.

Call clearin predictor.
Set clearin to -5cm.

Jan 20 1998 02:57:42:280PM 980120031 Ian Hutchinson Fizzle. Late breakdown. B_z is high again.

Fill puff to 24ms from 22.

Jan 20 1998 03:06:22:780PM 980120032 Ian Hutchinson Plasma. No change to predictor offset.
Solidly limited. Granetz is happy.

Repeat.

Jan 20 1998 03:15:41:490PM 980120033 Ian Hutchinson Fiz. Later breakdwon. 7.5ms.

EF4 to -1340.

Jan 20 1998 03:31:16:350PM 980120034 Ian Hutchinson Plasma. Breakdown at 6.1ms.
An interesting radiating/recombining region is seen on the TV
It appears to be the converse of the flux surfaces that connect to
the outboard midplane.

Repeat

Jan 20 1998 03:44:42:290PM 980120035 Ian Hutchinson Plasma.

Repeat

Jan 20 1998 03:58:26:350PM 980120036 Ian Hutchinson Fiz.

Move to outer limiter.
Rcur to .675, Clearin to -3cm. zxl to -.03m.
Fill to 20ms.

Jan 20 1998 04:12:49:420PM 980120037 Ian Hutchinson Plasma. Outboard limited as requested.

Repeat.

Jan 20 1998 04:18:43:140PM 980120038 Ian Hutchinson Fiz. Faster current rise leads to bounce on the outboard.

Fill to 22ms.

Jan 20 1998 04:27:24:490PM 980120039 Ian Hutchinson Fizzle.

OH2V to 0 from 20V at .01s.

Jan 20 1998 04:41:48:910PM 980120040 Ian Hutchinson Plasma. With ninja puff outboard.

OH2s to -10V at 7ms.

Jan 20 1998 04:55:48:680PM 980120041 Ian Hutchinson Fizzle.

OH1 to 125V at 5ms.

Jan 20 1998 04:59:47:920PM 980120042 Ian Hutchinson Plasma.

OH1 down to125V till 10ms.

Jan 20 1998 05:04:09:050PM 980120043 Ian Hutchinson Plasma.

Engineering Operator Comments

Shot Time Type Status Comment

1 08:55:32:370AM Test Ok

2 09:03:39:970AM Plasma Ok

3 09:15:17:200AM Plasma Ok

4 09:24:35:950AM Plasma Bad mag res flt

5 09:31:46:370AM Plasma Ok

6 09:40:09:830AM Plasma Ok

7 09:48:14:550AM Plasma Ok

8 09:55:56:580AM Plasma Ok

9 10:06:11:130AM Plasma Ok

10 10:15:45:480AM Plasma Ok

11 10:24:01:570AM Plasma Ok

12 10:35:48:520AM Plasma Ok

13 10:46:34:190AM Plasma Ok

14 10:55:48:180AM Plasma Ok

15 11:18:30:030AM Plasma Ok

16 11:27:58:480AM Plasma Ok

17 11:35:14:660AM Plasma Ok

18 11:49:17:650AM Plasma Ok

19 11:58:17:680AM Plasma Ok

20 12:07:15:770PM Plasma Ok

21 12:19:56:080PM Plasma Ok

22 12:32:06:660PM Plasma Ok

23 12:45:52:960PM Plasma Ok

24 12:58:50:090PM Plasma Ok

25 01:12:39:330PM Plasma Ok

26 01:27:01:590PM Plasma Ok

27 01:40:42:120PM Plasma Ok

28 01:54:51:610PM Plasma Ok

29 02:17:43:240PM Plasma Ok

30 02:26:27:520PM Plasma Ok

31 02:43:04:660PM Plasma Ok

32 02:51:41:340PM Plasma Ok

33 03:04:47:300PM Plasma Ok

34 03:13:46:600PM Plasma Ok

35 03:27:42:920PM Plasma Ok

36 03:44:55:440PM Plasma Ok

37 03:57:16:830PM Plasma Ok

38 04:09:04:000PM Plasma Ok

39 04:17:30:520PM Plasma Ok

40 04:25:54:610PM Plasma Ok

41 04:38:47:910PM Plasma Ok

42 04:48:18:250PM Plasma Ok

43 04:58:23:180PM Plasma Ok

Session Leader Comments
Jan 20 1998 09:14:06:590AM		Steve Wolfe	Run Plan for Tuesday, 980120 (first part) MP133 Boronization fiducials SL wolfe PO hutch ECDC in He from end of boronization untl two hors before run Engineering setup as on 980107031, TF under hybrid control Gas setup- K-side 30psi D2, hybrid enable B-top 6psi D2, hybrid enable B-side,lower 1psi Ar, hybrid no enabled Start with ususal Tuesday test Run fiducials until plasmas are reproducible, evaluate H-mode quality. Extend second RF pulse (2MW level) to end of flattop. If we are getting EDA h-modes, then increase current to 1MA, check confinement. If there is enough time, begin MP173B, Inside/outside fueling (Granetz as SL).
Jan 20 1998 08:58:22:630AM	980120001	Steve Wolfe	Shot 1: Tuesday OH test. OK. Oscillations on OH2U during charge.
Jan 20 1998 09:12:45:850AM	980120002	Steve Wolfe	Shot 2: First plasma attempt. fizzle.
Jan 20 1998 09:23:09:140AM	980120003	Steve Wolfe	Shot 3: Raise fill and try again. fizzle. bd even later.
Jan 20 1998 09:26:04:600AM	980120004	Steve Wolfe	Shot 4: Repeat. Magnet resistance fault.
Jan 20 1998 09:36:45:120AM	980120005	Steve Wolfe	Shot 5: Repeat. Another fizzle. Earlier breakdown, got some density (6e18) this time. CII level still small. F-side pressure still reads low (.03mTorr), despite 18msec on B-top pulse. Try reverting to an older startup segment.
Jan 20 1998 09:46:11:510AM	980120006	Steve Wolfe	Shot 6: change seg 1 to one from 980107025 fizzle. ratiomatic still reads low .032mTorr for 20msec puff.
Jan 20 1998 09:50:20:610AM	980120007	Steve Wolfe	Shot 7: Br tweak. Fizzle. Next shot, try some oh voltage tweaks.
Jan 20 1998 10:00:53:410AM	980120008	Steve Wolfe	Shot 8: V_oh1 and V_oh2 tweaks to increase Bzdot. fizzle. initial Bz seems more negative. f-side now at .035mTorr (no change to puff).
Jan 20 1998 10:13:48:890AM	980120009	Steve Wolfe	Shot 9: increase gas puff. fizzle.
Jan 20 1998 10:19:48:960AM	980120010	Steve Wolfe	Shot 10: EF4 tweak. fizzle. next, Raise the gas some more (to 30msec).
Jan 20 1998 10:29:19:970AM	980120011	Steve Wolfe	Shot 11: Raise pre-puff to 30msec. fizzle. Got .052mTorr on ratiomatic, slightly lower density. That didn't do it, so now lower it.
Jan 20 1998 10:40:17:440AM	980120012	Steve Wolfe	Shot 12: Drop pre-puff to 15 msec. fizzle. later bd. F-side down to .024
Jan 20 1998 10:52:03:000AM	980120013	Steve Wolfe	Shot 13: fill back to 25msec. Tweak V_oh1 more positive. fizzle. .045 on ratiomatic.
Jan 20 1998 11:01:44:390AM	980120014	Steve Wolfe	Shot 14: More of a v-oh1 tweak, and reduce rcur offset from 6300 ->5300. somewhat longer fizzle.
Jan 20 1998 11:24:03:090AM	980120015	Steve Wolfe	Shot 15: Lower EF3 voltage after 10msec. and change EF1 voltage. fizzle. later bd. Bz and Br both higher at t=0. There was a long wait for computer hang before this shot.
Jan 20 1998 11:29:39:890AM	980120016	Steve Wolfe	Shot 16: repeat. fizzles are quite reproducible.
Jan 20 1998 11:43:01:240AM	980120017	Steve Wolfe	Shot 17: Try something drastic. Increase V_oh1 by 70V. plasma to 1.67 sec, EDA H-mode at 1sec (nominal 2MW step).
Jan 20 1998 11:50:36:700AM	980120018	Steve Wolfe	Shot 18: Repeat. fizzle.
Jan 20 1998 12:01:24:030PM	980120019	Steve Wolfe	Shot 19: EF4 to -1325 back to fizzles.
Jan 20 1998 12:20:16:250PM	980120021	Steve Wolfe	Shot 20: pre-puff to 20msec fizzle. Almost went; got to 45kA.
Jan 20 1998 12:34:21:950PM	980120021	Steve Wolfe	Shot 21: pre-puff to 22msec, tweak EF1's again. plasma to 1.67sec, EDA H-mode at 1sec, dithering during 1MW step. No faults on RF this time. W=120kJ
Jan 20 1998 12:38:40:330PM	980120022	Steve Wolfe	Shot 22: decrease Br to .0045 plasma - 2 in a row! long hesitation, but it made it. L-H during the 1MW step this time. W=115kJ.
Jan 20 1998 12:53:05:670PM	980120023	Steve Wolfe	Shot 23: Repeat. plasma. L-H at .795, short ELM-free period, then EDA at .83sec. W=114kJ
Jan 20 1998 01:05:33:000PM	980120024	Steve Wolfe	Shot 24: Tweak seg 1 EF1's again. plasma. L-H at .83 and EDA at .87 Big injection at 1.2sec, when the Rf turns off.
Jan 20 1998 01:19:51:770PM	980120025	Steve Wolfe	Shot 25: repeat. plasma - LH at .797, EDA at .825 No injection this time, except an early one at .22sec. 2pi at 200kW, bolo = 600kW. W= 115kJ
Jan 20 1998 01:34:47:900PM	980120026	Steve Wolfe	Shot 26: Add some Argon for JR. 20msec at 1psi. plasma. Dithers longer before H-mode, .91, EDA @ .937 prad 2pi = 290kW, bolo = 720kW W=114kJ. Mo signal nearly doubles 7.6e13 -> 1.2e14 at 1.2sec
Jan 20 1998 01:48:25:380PM	980120027	Steve Wolfe	Shot 27: Go to 1MA. Take out previous Br tweak. plasma to 1.6sec. H-mode starts at 1sec (2nd step) nl4 goes to 2.24e20/m2. injection when RF turns off; 2pi goes from 400kW to 500kW, bolo=1MW W = 160kJ.
Jan 20 1998 02:03:47:540PM	980120028	Steve Wolfe	Shot 28: repeat, with some rf tweaks. plasma. L-H at 1sec, injection during RF, cools things down. W=150kJ. 2pi to 800kW, bolo to 1.8MW. Mo monitor (ch 2) to 1.6e15
Jan 20 1998 02:17:11:210PM	980120029	Robert Granetz	MP 173B -- Compare high-field side and low-field side gas fueling SL: Granetz PO: Hutchinson This half-day run is beginning at 14:05, with 980120029 as the first shot. It will be an 0.8 MA, 5.3 T, ohmic shot, limited on the inboard wall from t=0.7 to 1.2 s. We'd like to get an elongation of 1.45, but don't know how to set that up a priori, so let's see what we get on the first shot and adjust from there. The lower divertor NINJA has been filled to approximately 35 psi of D2. (It is used for both the inboard midplane capillary and the outboard midplane (A-B limiter) capillary.
Jan 20 1998 02:35:24:050PM	980120030	Robert Granetz	Shot 30 -- Plasma. Just barely limited from t=0.8 to 1.3 s. Kappa=1.55. Next shot: push up farther against the inboard limiter. This should also reduce the elongation.
Jan 20 1998 03:02:18:180PM	980120032	Robert Granetz	Shot 32 -- Plasma. Good inboard-limited plasma. Kappa=1.3. Density flattops at nl04=1.4e20 m-2 by t=0.95 s. Gas valve is off during the limited portion of the discharge. Next shot: fire inboard midplane NINJA valve (B16-001) from t=0.95 to 1.05 s.
Jan 20 1998 04:48:40:350PM	980120034	Robert Granetz	Shot 34 -- Plasma. Good inboard-limiter plasma with inboard NINJA puffing. Total plasma particles increase by only 0.13e20. Brian says that he is injecting a total of 21 torr-litres of D2, which corresponds to about 15e20 atoms. Initial injection rate is about 105e20 atoms per second; initial plasma particle rise is approx 2e20 ions/s. JT reports that the marfe Te is 1.1 ev (determined from slope of radiative recombination continuum of neutral deuterium). Next shot: repeat with no changes.
Jan 20 1998 03:46:55:310PM	980120035	Robert Granetz	Shot 35 -- Plasma. Another good inboard-limiter, inboard fueling shot. Very similar results. Next shot: same, except no NINJA puffing, to get a 2nd background shot.
Jan 20 1998 03:53:14:830PM	980120036	Robert Granetz	Shot 36 -- Fizzle. Next shot: run an outboard-limited plasma. No NINJA puffing.
Jan 20 1998 04:06:54:850PM	980120037	Robert Granetz	Shot 37 -- Plasma. Good outboard-limited plasma. There apparently was still a marfe, with accompanying density increase, just like there was on the previous inboard-limited shots. Inner gap is 1 cm. Kappa=1.4. Next shot: puff from the NINJA A-B outboard midplane capillary (A33-001). No puff from the inboard capillary.
Jan 20 1998 04:37:59:770PM	980120040	Robert Granetz	Shot 40 -- Plasma. Good outboard-limited plasma with outboard puffing. Density starts increasing at t=1.05 s (same as inboard cases) at the same rate of rise as the inboard case. However, the total number of particles continues rising, eventually reaching about 3 times more increase on this shot than on the inboard shots (035). Next shot: repeat, again with outboard puffing.
Jan 20 1998 04:53:15:550PM	980120042	Robert Granetz	Shot 42 -- Plasma. Good outboard-limited plasma with outboard puffing. Very similar to previous shot (040). Next shot: repeat, with no puffing.
Jan 20 1998 05:01:54:890PM	980120043	Robert Granetz	Shot 43 -- Plasma. Good outboard-limited shot with no NINJA puffing. Unfortunately, nl04 digitiser failed. End of run. Later this evening, Brian will run a couple of gas calibration shots to absolutely calibrate the inboard and outboard NINJA injections.

Physics Operator Comments
Jan 20 1998 10:24:15:770AM		Ian Hutchinson	Boronized over the weekend with He discharge cleaning for a couple of days. No D2 ECDC. So this is a startup with a boronized, heliumized machine.
Jan 20 1998 09:13:16:400AM	980120002	Ian Hutchinson	Cold start Used the settings from end of last week turned on segment 4 fiducial. Fizzle. Very low fill pressure: .022 mtorr. Very fast current rise. Breakdown a bit late, 7.5ms. Fill puff was only 14ms. Fill puff to 18 ms.
Jan 20 1998 09:23:10:410AM	980120003	Ian Hutchinson	Fizzle. Breakdown later 9ms. pressure .03mtorr. Much slower current rise. Repeat.
Jan 20 1998 09:31:24:920AM	980120004	Ian Hutchinson	Magnet resistance Fault.
Jan 20 1998 09:41:13:440AM	980120005	Ian Hutchinson	Fizzle. Earlier breakdown, 6ms. More light. Import segment 1 from 980107025. Gas fill puff to 20 ms. Br offset is 6mT versus 5.5 before.
Jan 20 1998 09:50:41:320AM	980120006	Ian Hutchinson	Fizzle. Breakdown at 5ms. Lower Br offset to 5mT
Jan 20 1998 09:57:09:660AM	980120007	Ian Hutchinson	Fizzle. Simlar, with a longer pause before dying. OH1 to 0V at 5ms from +100, OH2 to -20 from 0.
Jan 20 1998 10:12:07:010AM	980120008	Ian Hutchinson	Fizzle. Slower current rise because the Bz initially was less, despite my changes. Just irreproducibility. Fill puff to 25ms.
Jan 20 1998 10:17:00:440AM	980120009	Ian Hutchinson	Fizzle. Bz still a little low initially. Slow current rise. .045mtorr. EF4 to -1335 from -1345.
Jan 20 1998 10:21:36:780AM	980120010	Ian Hutchinson	Fizzle. Not much change visible to Bz. 0.045mtorr. Very similar. Fill puff to 30ms.
Jan 20 1998 10:36:53:040AM	980120011	Ian Hutchinson	Fizzle. Slightly lower current. Breakdown at 5ms. 0.052 mtorr. Fill puff to 15ms. Ratiomatic does not seem consistent with the puff.
Jan 20 1998 10:47:45:590AM	980120012	Ian Hutchinson	Fizzle. Did I load that? 10:27 was last. Yes .024mtorr. Later breakdown. 8ms. Fill puff back to 25ms. OH1 V to 40 V at 5ms. Trying a field index tweak.
Jan 20 1998 10:57:10:370AM	980120013	Ian Hutchinson	Fizzle. .045 mtorr. OH1 V to 80V at 5ms. Rcur offset to 5300 from 6300.
Jan 20 1998 11:19:51:670AM	980120014	Ian Hutchinson	Fizzle. Lower EF3 Voltage to 1500 from 2000 at 12ms. EF1 to +200V at 2ms.
Jan 20 1998 11:29:08:600AM	980120015	Ian Hutchinson	Long data system hang Fizzle. Bz initial increases to nearly zero. Slower current rise. Repeat.
Jan 20 1998 11:37:18:570AM	980120016	Ian Hutchinson	Fizzle. Raise OH1 V by about 70V from 5ms to 15ms.
Jan 20 1998 11:50:39:740AM	980120017	Ian Hutchinson	Plasma. At last! This has a much slower Bz ramp rate after 10ms, which it likes. Initial density is 7e18: high. .045mtorr: low ratiomatic fill, 25ms puff. H-mode at 2MW. Repeat.
Jan 20 1998 11:59:30:140AM	980120018	Ian Hutchinson	Fiz. Bz drops arbitrarily from previous shot. EF4 to -1325A
Jan 20 1998 12:08:55:330PM	980120019	Ian Hutchinson	Fiz. Fill to 20ms.
Jan 20 1998 12:25:55:720PM	980120020	Ian Hutchinson	Fiz. Got to 45kA. Breakdown at 7.4ms. .037 mtorr. Fill to 22ms, EF1s to 300V at 2ms.
Jan 20 1998 12:33:32:930PM	980120021	Ian Hutchinson	Plasma. Good radiation control during H-mode. Br offset to 4.5 from 5mT.
Jan 20 1998 12:47:19:530PM	980120022	Ian Hutchinson	Plasma. 2 in a row. Serious hesitation. Late breakdown: .85ms. B_r lower itself so now it is a bit low. H-mode at 1MW. Repeat.
Jan 20 1998 01:00:17:290PM	980120023	Ian Hutchinson	Plasma. H-mode EDA at 1MW. Add a point on the EF1 trace at 250V, 20ms.
Jan 20 1998 01:13:59:760PM	980120024	Ian Hutchinson	Plasma. A significant injection at 1.2s.
Jan 20 1998 01:28:06:050PM	980120025	Ian Hutchinson	Plasma. Enable Argon. Copy seg4 to seg 2. Use seg 2. 20ms Ar puff.
Jan 20 1998 01:42:02:700PM	980120025	Ian Hutchinson	Plasma. Prad higher. Mo also increased. Ip to 1MA.
Jan 20 1998 01:58:21:540PM	980120027	Ian Hutchinson	Plasma. Breakdown at 7.5ms. H-mode at 2MA. Repeat.
Jan 20 1998 02:19:02:150PM	980120028	Ian Hutchinson	Plasma. Big injection during RF. Switch to inboard ninja injection program. Load seg 2 from 980120026 0.8MA. Draw clearin from (.7,-.008) to (.8,-.03) and leave in. To touch inboard. Draw rcur (.7,.669) to (.8,.662) 7mm motion to avoid touching outboard.
Jan 20 1998 02:27:55:920PM	980120029	Ian Hutchinson	Fizzle. Breakdown at 11 ms! EF4 to -1335.
Jan 20 1998 02:44:15:250PM	980120030	Ian Hutchinson	Plasma. Not limited enough. There is a nearly 2cm offset in the hybrid clearin. Outer gap is well maintained at 1.5cm. Call clearin predictor. Set clearin to -5cm.
Jan 20 1998 02:57:42:280PM	980120031	Ian Hutchinson	Fizzle. Late breakdown. B_z is high again. Fill puff to 24ms from 22.
Jan 20 1998 03:06:22:780PM	980120032	Ian Hutchinson	Plasma. No change to predictor offset. Solidly limited. Granetz is happy. Repeat.
Jan 20 1998 03:15:41:490PM	980120033	Ian Hutchinson	Fiz. Later breakdwon. 7.5ms. EF4 to -1340.
Jan 20 1998 03:31:16:350PM	980120034	Ian Hutchinson	Plasma. Breakdown at 6.1ms. An interesting radiating/recombining region is seen on the TV It appears to be the converse of the flux surfaces that connect to the outboard midplane. Repeat
Jan 20 1998 03:44:42:290PM	980120035	Ian Hutchinson	Plasma. Repeat
Jan 20 1998 03:58:26:350PM	980120036	Ian Hutchinson	Fiz. Move to outer limiter. Rcur to .675, Clearin to -3cm. zxl to -.03m. Fill to 20ms.
Jan 20 1998 04:12:49:420PM	980120037	Ian Hutchinson	Plasma. Outboard limited as requested. Repeat.
Jan 20 1998 04:18:43:140PM	980120038	Ian Hutchinson	Fiz. Faster current rise leads to bounce on the outboard. Fill to 22ms.
Jan 20 1998 04:27:24:490PM	980120039	Ian Hutchinson	Fizzle. OH2V to 0 from 20V at .01s.
Jan 20 1998 04:41:48:910PM	980120040	Ian Hutchinson	Plasma. With ninja puff outboard. OH2s to -10V at 7ms.
Jan 20 1998 04:55:48:680PM	980120041	Ian Hutchinson	Fizzle. OH1 to 125V at 5ms.
Jan 20 1998 04:59:47:920PM	980120042	Ian Hutchinson	Plasma. OH1 down to125V till 10ms.
Jan 20 1998 05:04:09:050PM	980120043	Ian Hutchinson	Plasma.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:55:32:370AM	Test	Ok
2	09:03:39:970AM	Plasma	Ok
3	09:15:17:200AM	Plasma	Ok
4	09:24:35:950AM	Plasma	Bad	mag res flt
5	09:31:46:370AM	Plasma	Ok
6	09:40:09:830AM	Plasma	Ok
7	09:48:14:550AM	Plasma	Ok
8	09:55:56:580AM	Plasma	Ok
9	10:06:11:130AM	Plasma	Ok
10	10:15:45:480AM	Plasma	Ok
11	10:24:01:570AM	Plasma	Ok
12	10:35:48:520AM	Plasma	Ok
13	10:46:34:190AM	Plasma	Ok
14	10:55:48:180AM	Plasma	Ok
15	11:18:30:030AM	Plasma	Ok
16	11:27:58:480AM	Plasma	Ok
17	11:35:14:660AM	Plasma	Ok
18	11:49:17:650AM	Plasma	Ok
19	11:58:17:680AM	Plasma	Ok
20	12:07:15:770PM	Plasma	Ok
21	12:19:56:080PM	Plasma	Ok
22	12:32:06:660PM	Plasma	Ok
23	12:45:52:960PM	Plasma	Ok
24	12:58:50:090PM	Plasma	Ok
25	01:12:39:330PM	Plasma	Ok
26	01:27:01:590PM	Plasma	Ok
27	01:40:42:120PM	Plasma	Ok
28	01:54:51:610PM	Plasma	Ok
29	02:17:43:240PM	Plasma	Ok
30	02:26:27:520PM	Plasma	Ok
31	02:43:04:660PM	Plasma	Ok
32	02:51:41:340PM	Plasma	Ok
33	03:04:47:300PM	Plasma	Ok
34	03:13:46:600PM	Plasma	Ok
35	03:27:42:920PM	Plasma	Ok
36	03:44:55:440PM	Plasma	Ok
37	03:57:16:830PM	Plasma	Ok
38	04:09:04:000PM	Plasma	Ok
39	04:17:30:520PM	Plasma	Ok
40	04:25:54:610PM	Plasma	Ok
41	04:38:47:910PM	Plasma	Ok
42	04:48:18:250PM	Plasma	Ok
43	04:58:23:180PM	Plasma	Ok