Alcator C-Mod Run 960118 Information

Miniproposals

Miniproposal: 118

Date Filed: 10/19/1995

Title: ICRF Heated H-Mode at 2.6 T

First Author: Yuichi Takase

Session Leader: Yuichi Takase (shots 1-39)

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

Engineering Operator Run Comment
2.6 Tesla/Goetz

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:14:947PM

Author: To Be Determined

Run summary 960118

SL: Takase
PO: Goetz
EO: Bertolino / Daigle

MP118 ICRF Heated H-Mode at 2.6T
Using Second Harmonic H Minority Heating
Mainly Density and Minority Concentration Scans

We have achieved one of the objectives of this run, to
demonstrate that second harmonic H minority heating works.
Unfortunately, D-port transmitter broke on shot 006 and we had
to do the density and concentration scans at 1MW power level.
Consequently, we were not able to operate way above threshold.
The current was fixed at 0.55MA for these scans.

Heating was definitely observed, but it is not clear how efficient
the heating was. H-mode was observed except at the highest density
(target nel_04 > 1). The stored energy typically doubled in H-mode
plasmas, but no spectacular H-factors were observed.
H-factors of these H-modes were about 1. However, both ohmic and
L-mode plasmas had H-factors significantly below 1, as low as 0.6.

H concentration was varied by changing the gas mix in the plenum.
The H fraction in the mix was varied in the following order:
20%, 40%, 10%, 0%, and 100%. Density scan was performed in the
range (target value before RF) 0.5 to 1.2 on nel_04. It was
operationally difficult to go down further in density.
Similar results were obtained at all concentration. At low density,
ohmic and RF H-modes were observed. At intermediate density, only
RF H-modes were observed. At high density no H-modes were observed.
The largest stored energy increases were observed at intermediate
density. Preliminary indication from H_alpha/D_alpha measurements
is that the H concentration was not varying as much as we had hoped.
Isotope dependence of energy confinement was not clearly observed.
Evidence of sawtooth stabilization was not observed.

Towards the end of the run, Li pellets were injected (shots 036 and 037).
H-mode was observed after RF came on, but the plasma disrupted shortly
thereafter.

The last shot was a fiducial. In contrast to shot 001, no H-mode was
observed, and heating was below L-mode. There was probably still a large
concentration of H. Jim Irby reports that C level has been increasing
steadily throughout the day.

shot
[100%D in plenum]
001 pla Fiducial.
No E-port (dummy load breaker tripped).
GPC not set up for 5.3T.
[20%H/80%D in plenum]
002 fiz 1st 2.6T attempt (breakdown at 4.85T)
003 pla 440kA, nel_04=0.75, D+E didn't run together, lots of short H-modes
W_EFIT=17->31kJ, beta_p=0.3->0.6
turn on RF position FB for next shot
004 fiz
005 pla 530kA, ohmic H-mode, RF moved plasma out (gain=-1500, target=2.9)
W_EFIT=26->38kJ
006 pla 540kA, ohmic H-mode, nel=0.9 @ RF turn on (0.6 prog), FB target=3.0
W_EFIT=26->48kJ
[D-port out for the rest of day (broken capacitor)]
007 pla no ohmic H-mode, nel=0.9 @ RF turn on (nel prog = 1.0), FB target=3.1
W_EFIT=21->40kJ
008 pla no RF (mistuned), nel=1.05->1.2 (nel prog = 1.2), W_EFIT=17kJ
[gpc looking at third harmonic from Shot 009]
009 fiz
010 pla no H-mode, nel=1.2->1.1 (nel prog = 1.2), W_EFIT=20->24kJ
011 pla H-modes, nel=0.9 (0.8 prog), W_EFIT=21->37kJ
012 pla added low power RF (0.1-0.6sec), nel=0.5 (0.5 prog), disr @ 0.65s
moved RF FB gate start to 0.62s
013 dud mag res fault
014 pla ohmic and RF H-modes, nel=0.6 (0.5 prog), RF trips, W_EFIT=23->36kJ
015 pla inj @ .23, disr @ .29
016 pla ohmic and RF H-modes, nel=0.55 (0.5 prog), lost H-mode @ 0.83s
W_EFIT=20->38kJ
[40%H/60%D in plenum]
017 pla early disr
018 pla ohmic and RF H-modes, nel=0.8 (0.5 prog), W_EFIT=25->44kJ
019 pla RF H-modes, nel+0.9 (0.8 prog), W_EFIT=23->40kJ
020 pla early disr
021 pla no RF, no H-mode, W_EFIT=20kJ
022 pla RF H-mode (ELMy), nel=1.0 (1.0 prog), W_EFIT=20->42kJ
023 pla early disr
024 pla no H-mode, nel=1.1->1.2 (1.2 prog), W_EFIT=22->27kJ
025 pla ohmic and RF H-modes, nel=0.7 (0.5 prog), W_EFIT=25->44kJ
[10%H/90%D in plenum]
026 pla early disr
027 pla RF H-mode, nel=0.6 (0.5 prog), W_EFIT=20->43kJ
028 pla RF H-mode, nel=0.8 (0.8 prog), W_EFIT=20->38kJ
029 pla early disr
030 pla RF H-mode, nel=1.0 (1.0 prog), W_EFIT=21->40kJ
031 pla RF H-mode, nel=1.1 (1.2 prog), W_EFIT=20->26kJ
[100%D in plenum]
032 pla RF H-mode, nel=0.75 (0.6 prog), W_EFIT=21->39kJ
033 pla RF H-mode, nel=0.75 (0.6 prog), W_EFIT=21->43kJ
[100%H in plenum]
034 pla RF H-mode, nel=0.75 (0.6 prog), W_EFIT=22->45kJ
035 pla RF H-mode, nel=0.7 (0.6 prog), W_EFIT=20->42kJ
036 pla Li pellet @ 0.685, RF @ 0.700 sec, disrupt, W_EFIT=20->33kJ
037 pla Li pellet @ 0.685, RF @ 0.700 sec, disrupt
038 dud fiducial (no gas)
039 pla fiducial, no H-mode

Physics Operator Summaries

Entered: Jul 7 2004 04:36:55:817PM

Author: To Be Determined

Physics operator summary for 960118

EO: Bertolino / Daigle
PO: Goetz
SL: Takase

Run 960118 was in support of Mini-Proposal #118 - ICRF Heated H-Mode at 2.6T.
The primary objective of this mini-proposal is to explore the
possibility of achieving improved H-factors by operating at lower
values of nebar*Bt. A secondary objective is to study sawtooth
stabilization using this heating scheme.

Plan:
establish a 2.6T shot that can be heated
H minority scan at fixed density
scan density at best H concentration
study sawtooth stabilization

The plan was carried out. Plasmas with Ip=0.55MA and Bt=2.6T were obtained
and heated with ICRF. The density was scanned with varying H fractions.
Sawtooth stabilization was not attempted. See the Session Leader's summary
for a more detailed description of the physics.

Some things discovered today:
1) Startup was very good today once the correct prefill puff duration was
determined. There were three fizzles in the first nine shots but no
more fizzles for the rest of the day. The radial field offset was
changed and then changed back, but not touched after shot 005. A rule
of thumb today was 12msec of prepuff following a low density shot and
10msec of prepuff following a high density shot (here, high density
means nl04 >= 1.0e20). Plasmas began to bounce outside late in the
run (tracked by the z_meter_array) and increasing the prepuff stopped
this phenomenon. All breakdowns, non-fiducials, were at 4.8T.
2) The number of useful plasmas was limited by early disruptions. Some of
these disruptions were caused by the RF feedback causing the plasma to
move in and out rapidly. Others were caused by too much gas early
causing impurities and such to enter the plasma. Two shots, each at
low density had indications of large moly injections. It does seem
difficult to make robust plasmas with Ip=0.55MA and Bt=2.6T.
3) The hybrid was used to control the TF current without any worries.
The pulse length was extended to 1.2 sec to obtain a long enough
flat-top for the experiment. When extending the flat-top, do not
forget to extend the gains on the individual wires.
4) All in all, not a bad day to be in the chair.

Engineering, computing, and diagnostics today: Cooling cost 1/2 hour at the
beginning (EF1L and EF2U were not cold). Two duds today, one due to
a magnet resistance fault and one due to the hybrid gas waveforms not
making it to the gas PLC. The alternator lost voltage on one shot.
One unexplained TF crowbar. ZENITH hung before one shot causing a
delay.

Scorecard: 39 shots = 34 plasmas + 3 fizzles + 2 duds

Shot summary for Run 960118:

Load 951218006 with:
14 msec prefill puff on PG4
NL_04 = 0.6e20
IP = -450000
V_OH1 = 170V from .005 to .015 sec
coldstart hybrid - all matrices respond

Shot change result
____ _____ ______
1 load 960117018 for fiducial acceptable fiducial

2 see above fizzle - late b.d.; CII light high; Br
too negative
very low

3 BR_0 off=.007; prefill=11msec plasma - disr. @ 1.17; o.k start

4 IP=-55000; RF_LOAD_E=-1500; fizzle - strong; moves outside
extend all P's and V's to 1.2s

5 prefill=13msec plasma - disr.@0.85; vert osc. @ 0.75

6 BR_0 off=.0066 plasma - disr.@1.17; q<3; no density
control in H-mode

7 NL_04=1e20; ramp IP to -570000; plasma - disr. @ 1.21; nl04=0.85e20
extend gains on wires past 1.2s

8 extend TF to 1.29sec; PG3=40V plasma - disr.@1.31; NL04=1.0e20; no RF
NL04=1.2e20

9 PG3=50V fizzle - too much prefill gas

10 prefill puff = 11msec plasma - disr@1.31sec; no H-mode

11 TF invert = 1.45s; NL04=0.8e20; plasma - disr@1.17; multiple H-modes
PG3=40V

12 NL04=0.5e20; PG3=25V; prefill plasma - disr.@0.66; possible RF
=12msec; PG1=20msec feedback turn-on problems

13 no changes dud - magnet resistance fault

14 try again plasma - disr.@0.89; vertical & radial
oscillation begins @ 0.8; o.gap = 1mm

15 RF loading to 3.2 Ohms plasma - disr.@0.28; something fell in
at 0.23 sec

16 prefill puff = 13msec plasma - disr.@1.06; RF stays on

17 40% H / 60% D in A_SIDE plasma - disr.@.303; something in @ .276

18 let NL04 overshoot; chopper on plasma - disr@1.06; ohmic and RF H-mode
at -.005 sec

19 NL04=0.8e20; PG3=30V plasma - disr@1.30; RF H-mode; NL04=0.86

20 NL04=1.0e20; PG3=40V plasma - disr.@0.46; doesn't take gas

21 prefill 12msec; PG3=45V plasma - disr.@1.33; NL04=1e20; no RF

22 prefill 11msec plasma - disr.@1.15; NL04=1.2e20; H-mode

23 prefill 10msec; NL04=1.2e20; plasma - disr.@0.32; gassed to death
PG3=55V

24 PG3=40V from 0.1 to 0.3sec plasma - disr.@1.31; nl04=1.2e20; no
H-mode

25 NL_04=0.5e20; PG3=20V plasma - disr.@1.29; nl04=0.72; ohmic
and RF H-modes

26 10% H / 90% D in A_SIDE plasma - disr.@.50; nl04=0.5e20

27 turn on ZXL gain slower to try plasma - disr.@1.22; nl04=0.54;RF H-mode
and keep EF1L off the rail

28 NL04=0.8e20; PG3=30V plasma - disr.@1.19; nl04=0.84;RF H-mode

29 NL04=1.0e20; PG3=40V plasma - disr.@0.32; too much gas

30 reduce PG3 from 0.1 to 0.3 sec plasma - disr.@1.23; nl04=1.0; RF H-mode

31 NL04=1.2e20 and PG3=50V plasma - disr.@1.31; nl04=1.1; RF; no H

32 100% D in A_SIDE; NL04=0.6e20 plasma - all the way down; nl04=0.74e20
PG3=20V ohmic and RF H-modes

33 no changes plasma - disr@1.24; nl04=0.6 before
ohmic H-mode; 0.73 before RF H-mode

34 100% H in A_SIDE (20PSIA); plasma - disr.@1.25; nl04=0.75 before
prefill puff = 12msec RF H-mode

35 no changes plasma - disr.@1.20; nl04=0.73e20
before RF H-mode

36 enable LPI plasma - disr. @ 0.79; small pellet;
RF feedback driving it crazy

37 no changes plasma - dsir. @ 0.76; RF feedback
drives RCUR crazy

38 load 960118001 for fiducial dud - waveforms didn't make it from
the hybrid to the PLC

39 try again ohmic section of fiducial is acceptable
RF section did not go into H-mode

Session Leader Comments

Jan 18 1996 08:53:08:890AM Yuichi Takase 2.6T Second Harmonic H Minority Heating
Mainly Density and Minority Concentration Scans

Jan 18 1996 09:00:16:380AM 960118001 Yuichi Takase Fiducial.
No E-port (dummy load breaker tripped).
GPC not set up for 5.3T.

Jan 18 1996 09:07:33:190AM 960118002 Yuichi Takase Shot 002 fiz
1st 2.6T attempt (breakdown at 4.85T)

Jan 18 1996 09:47:50:820AM 960118003 Yuichi Takase Shot 003
440kA, nel_04=0.75, D+E didn't run together, lots of short H-modes
W_EFIT=17->31kJ, beta_p=0.3->0.6
turn on RF position FB for next shot

Jan 18 1996 09:57:56:350AM 960118004 Yuichi Takase Shot 004 fizzle

Jan 18 1996 09:59:22:070AM 960118005 Yuichi Takase Shot 005 plasma
530kA, ohmic H-mode, RF moved plasma out (gain=-1500, target=2.9)

Jan 18 1996 10:17:49:350AM 960118006 Yuichi Takase Shot 006 plasma
540kA, ohmic H-mode (better shot), RF FB target=3.0
nel=0.9 @ RF turn on (0.6 prog), W_EFIT=26->48kJ

Jan 18 1996 10:54:57:140AM 960118007 Yuichi Takase Shot 007 plasma
[D-port out for the rest of day (broken capacitor)]
no ohmic H-mode, nel=0.9 @ RF turn on (nel prog = 1.0), FB target=3.1
W_EFIT=21->40kJ

Jan 18 1996 10:55:23:090AM 960118008 Yuichi Takase Shot 008 plasma
no RF (mistuned), nel=1.05->1.2 (nel prog = 1.2), W_EFIT=17kJ

Jan 18 1996 10:55:54:330AM 960118009 Yuichi Takase Shot 009 fizzle

Jan 18 1996 11:12:14:180AM 960118010 Yuichi Takase Shot 010 plasma
no H-mode, nel+1.2->1.1 (nel prog = 1.2), W_EFIT=20->24kJ

Jan 18 1996 12:11:27:970PM 960118011 Yuichi Takase Shot 011 plasma
H-modes, nel=0.9 (0.8 prog), W_EFIT=21->37kJ

Jan 18 1996 12:11:45:260PM 960118012 Yuichi Takase Shot 012 plasma
added low power RF (0.1-0.6sec), nel=0.5 (0.5 prog), disr @ 0.65s
moved RF FB gate start to 0.62s

Jan 18 1996 12:12:08:470PM 960118013 Yuichi Takase Shot 013 dud
mag res fault

Jan 18 1996 12:12:25:370PM 960118014 Yuichi Takase Shot 014 plasma
ohmic and RF H-modes, nel=0.6 (0.5 prog), RF trips, W_EFIT=23->36kJ

Jan 18 1996 12:12:41:140PM 960118015 Yuichi Takase Shot 015 plasma
inj @ .23, disr @ .29

Jan 18 1996 12:40:11:020PM 960118016 Yuichi Takase Shot 016 plasma
ohmic and RF H-modes, nel=0.55 (0.5 prog), lost H-mode @ 0.83s
W_EFIT=20->38k

Jan 18 1996 12:40:37:440PM 960118017 Yuichi Takase Shot 017 plasma
[40%H/60%D in plenum]
early disr

Jan 18 1996 01:18:38:140PM 960118018 Yuichi Takase Shot 018 plasma
ohmic and RF H-modes, nel=0.8 (0.5 prog), W_EFIT=25->44kJ

Jan 18 1996 01:18:58:120PM 960118019 Yuichi Takase Shot 019 plasma
RF H-modes, nel+0.9 (0.8 prog), W_EFIT=23->40kJ

Jan 18 1996 01:19:16:610PM 960118020 Yuichi Takase Shot 020 plasma
early disr

Jan 18 1996 01:34:24:490PM 960118021 Yuichi Takase Shot 021 plasma
no RF, no H-mode, W_EFIT=20kJ

Jan 18 1996 02:11:06:190PM 960118022 Yuichi Takase Shot 022 plasma
RF H-mode (ELMy), nel=1.0 (1.0 prog), W_EFIT=20->42kJ

Jan 18 1996 02:11:23:890PM 960118023 Yuichi Takase Shot 023 plasma
early dis

Jan 18 1996 02:11:46:710PM 960118024 Yuichi Takase Shot 024 plasma
no H-mode, nel=1.1->1.2 (1.2 prog), W_EFIT=22->27kJ

Jan 18 1996 02:34:54:320PM 960118025 Yuichi Takase Shot 025 plasma
ohmic and RF H-modes, nel=0.7 (0.5 prog), W_EFIT=25->44kJ

Jan 18 1996 02:35:28:000PM 960118026 Yuichi Takase Shot 026 plasma
[10%H/90%D in plenum]
early disr

Jan 18 1996 02:48:16:240PM 960118027 Yuichi Takase Shot 027 plasma
RF H-mode, nel=1.1->1.2 (1.2 prog), W_EFIT=20->43kJ

Jan 18 1996 05:12:08:710PM 960118028 Yuichi Takase Shot 028 plasma
RF H-mode, nel=0.8 (0.8 prog), W_EFIT=20->38kJ

Jan 18 1996 05:12:24:970PM 960118029 Yuichi Takase Shot 029 plasma
early disr

Jan 18 1996 05:12:42:160PM 960118030 Yuichi Takase Shot 030 plasma
RF H-mode, nel=1.0 (1.0 prog), W_EFIT=21->40kJ

Jan 18 1996 05:13:00:290PM 960118031 Yuichi Takase Shot 031 plasma
RF H-mode, nel=1.1 (1.2 prog), W_EFIT=20->26kJ

Jan 18 1996 08:49:24:370PM 960118031 Yuichi Takase Shot 031 plasma
correction:
no H-mode, nel=1.1 (1.2 prog), W_EFIT=20->26kJ

Jan 18 1996 05:13:31:030PM 960118032 Yuichi Takase Shot 032 plasma
[100%D in plenum]
RF H-mode, nel=0.75 (0.6 prog), W_EFIT=21->39kJ

Jan 18 1996 05:14:01:460PM 960118033 Yuichi Takase Shot 033 plasma
[100%H in plenum]
RF H-mode, nel=0.75 (0.6 prog), W_EFIT=22->45kJ

Jan 18 1996 06:13:56:520PM 960118033 Yuichi Takase Shot 033 plasma
RF H-mode, nel=0.75 (0.6 prog), W_EFIT=21->43kJ
(previous entry was really for Shot 034)

Jan 18 1996 05:14:21:700PM 960118034 Yuichi Takase Shot 034 plasma
RF H-mode, nel=0.7 (0.6 prog), W_EFIT=20->42kJ

Jan 18 1996 06:14:32:840PM 960118034 Yuichi Takase Shot 034 plasma
[100%H in plenum]
RF H-mode, nel=0.75 (0.6 prog), W_EFIT=22->45kJ
(previous entry was really for Shot 035)

Jan 18 1996 05:14:41:480PM 960118035 Yuichi Takase Shot 035 plasma
Li pellet @ 0.685, RF @ 0.700 sec, disrupt, W_EFIT=20->33kJ

Jan 18 1996 06:14:53:990PM 960118035 Yuichi Takase Shot 035 plasma
RF H-mode, nel=0.7 (0.6 prog), W_EFIT=20->42kJ
(previous entry was really for Shot 036)

Jan 18 1996 05:14:57:760PM 960118036 Yuichi Takase Shot 036 plasma
Li pellet @ 0.685, RF @ 0.700 sec, disrupt

Jan 18 1996 06:15:15:060PM 960118036 Yuichi Takase Shot 036 plasma
Li pellet @ 0.685, RF @ 0.700 sec, disrupt, W_EFIT=20->33kJ
(previous entry was really for Shot 037)

Jan 18 1996 05:15:44:680PM 960118037 Yuichi Takase Shot 037 dud
fiducial (no gas)

Jan 18 1996 06:15:36:790PM 960118037 Yuichi Takase Shot 037 plasma
Li pellet @ 0.685, RF @ 0.700 sec, disrupt
(previous entry was really for Shot 038)

Jan 18 1996 06:18:26:110PM 960118038 Yuichi Takase Shot 038 dud
fiducial attempt (didn't get gas)

Jan 18 1996 06:18:46:780PM 960118039 Yuichi Takase Shot 039 plasma
fiducial, no H-mode

Physics Operator Comments

Jan 18 1996 08:24:35:040AM John Goetz Run 960118: Mini-proposal #118 - ICRF Heated H-Mode at 2.6T

The primary objective of this mini-proposal is to explore the
possibility of achieving improved H-factors by operating at lower
values of nebar*Bt. A secondary objective is to study sawtooth
stabilization using this heating scheme.

Plan:
establish a 2.6T shot that can be heated
H minority scan at fixed density
scan density at best H concentration
study sawtooth stabilization

Jan 18 1996 08:53:12:100AM 960118001 John Goetz Shot 960118001:
Load 960117018 for a fiducial

Results:
acceptable fiducial
ECE has grating for 2.6T

Jan 18 1996 09:10:50:800AM 960118002 John Goetz Shot 960118002:
Load 951218006
14 msec prefill puff on PG4
NL_04 = 0.6e20
IP = -450000
V_OH1 = 170V from .005 to .015

Results:
fizzle - late breakdown
radial field a little negative
CII light 2x shot 001 - no sign of a burnout

Jan 18 1996 09:30:43:060AM 960118003 John Goetz Shot 960118003:
BR_0 offset = .007 (was .0064)
prefill puff = 11 msec (was 14)

Results:
plasma - disr. @ 1.17 sec
Ip = 0.45MA; Bt = 2.6T -> q=4
H-modes; only one transmitter stayed on

Jan 18 1996 09:41:34:690AM 960118004 John Goetz Shot 960118004:
IP = -550000
RF_LOAD_E = -1500 in RCUR
extend all P's and V's to 1.2sec

Results:
fizzle (strong)
z-meter array says it moves out and hits something
Bz not coming in fast enough

Jan 18 1996 09:54:02:050AM 960118005 John Goetz Shot 960118005:
prefill puff = 13msec

Results:
plasma - disr. @ 0.85sec (q = 3.2)
ohmic H-mode @ 0.45
vertical oscillation beginning at 0.75

Jan 18 1996 10:09:28:690AM 960118006 John Goetz Shot 960118006:
BR_0 offset = .0066

Results:
plasma - disrupts @ 1.17sec
plasma current is drooping and q drops below 3
antenna position feedback better

Jan 18 1996 10:32:12:500AM 960118007 John Goetz Shot 960118007:
start density scan - NL_04 = 1.0e20
ramp IP to -570000 to keep current constant
extend gains! on wires to accomodate 1.2sec pulse

Results:
plasma - disrupts @ 1.21
better control of the x-point - q remains above 3
no D-port antenna for the rest of the day
nl_04 = 0.85e20 before RF - no ohmic H-mode

Jan 18 1996 11:12:42:690AM 960118009 John Goetz Shot 960118009:
PG3 = 50V

Results:
fizzle (weak)
too much prefill gas (last shot was high density)
fields o.k.

Jan 18 1996 11:08:41:630AM 960118010 John Goetz Shot 960118010:
prefill puff = 11msec

Results:
plasma - disrupts @ 1.31
nl04 = 1.16e20 before RF
no H-mode

Jan 18 1996 11:38:13:560AM 960118011 John Goetz Shot 960118011:
TF invert = 1.45 sec
NL04 = 0.8e20
PG3 = 40V

Results:
plasma - disrupts @ 1.17 (must not be related to the TF invert)
multiple H-ELMy H transitions

Jan 18 1996 11:39:33:160AM 960118012 John Goetz Shot 960118012:
NL04 = 0.5e20
PG3 = 25V
prefill puff = 12msec
PG1 = 20msec

Results:
plasma - disrupts @ 0.66
just after high power RF turn-on; possibly RF position feedback
related

Jan 18 1996 11:40:30:450AM 960118013 John Goetz Shot 960118013:
no changes

Results:
dud - magnetic resistance fault

Jan 18 1996 11:57:45:760AM 960118014 John Goetz Shot 960118014:
try again

Results:
plasma - disrupts @ 0.89sec
vertical and radial oscillations begin at 0.8sec
thermal quench @ 0.8sec
outer gap = 1mm when all this happens

Jan 18 1996 12:14:36:150PM 960118015 John Goetz Shot 960118015:
RF loading to 3.2 Ohms

Results:
plasma - disrupts @ 0.28
something moves through the plasma @ 0.23 sec - more than
likely it is Mo

Jan 18 1996 12:33:11:330PM 960118016 John Goetz Shot 960118016:
prefill puff = 13 msec

Results:
plasma - disrupts @ 1.06 sec
RF stays on - drops out of ELM-free H-mode @ 0.82 sec
possible Mo injection death

Jan 18 1996 12:42:14:060PM 960118017 John Goetz Shot 960118017:
40% H / 60% D in A_SIDE (was 20% H / 80% D)

Results:
plasma - disrupts @ 0.303 sec
looks like something comes in to the plasma @ 0.276 sec

Jan 18 1996 01:09:05:340PM 960118018 John Goetz Shot 960118018:
chopper start time = -.005 sec (was +.06 sec)
let NL04 overshoot then come back down

Results:
plasma - disrupts @ 1.06
ohmic and RF H-mode

Jan 18 1996 01:09:41:770PM 960118019 John Goetz Shot 960118019:
NL04 = 0.8e20 and PG3 = 30V

Results:
plasma - disrupts @ 1.30
NL04 = 0.86 before RF
RF H-mode only

Jan 18 1996 01:22:09:670PM 960118020 John Goetz Shot 960118020:
NL04 = 1.0e20 and PG3 = 40V

Results:
plasma - disrupts @ 0.46 sec
discharge doesn't want to take up the gas

Jan 18 1996 01:32:14:000PM 960118021 John Goetz Shot 960118021:
prefill puff = 12 msec
PG3 = 45V

Results:
plasma - disrupts @ 1.33
NL04 = 1.e20
no high power RF

Jan 18 1996 01:43:38:080PM 960118022 John Goetz Shot 960118022:
prefill puff = 11 msec

Results:
plasma - disrupts @ 1.15
NL04 = 1e20 before RF
RF H-mode (ELMy)

Jan 18 1996 01:51:47:070PM 960118023 John Goetz Shot 960118023:
prefill puff = 10 msec
NL04 = 1.2e20 and PG3 = 55V

Results:
plasma - disrupts @ 0.32 sec
Dalpha saturates beginning @ 0.2 - probably gassed this one
to death

Jan 18 1996 02:03:04:490PM 960118024 John Goetz Shot 960118024:
drop PG3 to 40V from 0.1 to 0.3 sec

Results:
plasma - disrupts @ 1.31
NL04 = 1.2e20
RF pulse - no H-mode

Jan 18 1996 02:18:29:160PM 960118025 John Goetz Shot 960118025:
NL04 = 0.5e20 and PG3 = 20V

Results:
plasma - disrupts @ 1.29
NL04 = 0.72e20 when the ohmic H-mode occurs - must be wall
fueling because the gas is off
RF H-mode

Jan 18 1996 02:40:09:890PM 960118026 John Goetz Shot 960118026:
10% H / 90% D in A_SIDE (20PSIA total)
move NL04 overshoot point to 0.2sec

Results:
plasma - disrupts @ .502 sec
nl04 = 0.5e20

Jan 18 1996 02:41:37:250PM 960118027 John Goetz Shot 960118027:
turn on ZXL gain more slowly (jump in EF1L @ .114 sec)

Results:
plasma - disrupts @ 1.22 sec
nl04 = 0.54e20 when RF turns on
no ohmic H-mode; RF H-mode

Jan 18 1996 02:54:50:850PM 960118028 John Goetz Shot 960118028:
NL04 = 0.8e20 and PG3 = 30V

Results:
plasma - disrupts @ 1.19
nl04 = 0.84e20 before RF H-mode

Jan 18 1996 03:04:28:970PM 960118029 John Goetz Shot 960118029:
NL04 = 1.0e20 and PG3 = 40V

Results:
plasma - disrupts @ 0.32
Dalpha saturated from 0.2 sec onward - very similar shot
to 023; too much gas

Jan 18 1996 03:14:22:940PM 960118030 John Goetz Shot 960118030:
reduce PG3 from 0.1 to 0.3 sec

Results:
plasma - disrupts @ 1.23
nl04 = 1.0e20 before RF H-mode
hard x-rays from 0.14 to 0.20 sec

Jan 18 1996 03:27:56:690PM 960118031 John Goetz Shot 960118031:
NL04 = 1.2e20 and PG3 = 50V

Results:
plasma - disrupts @ 1.31
nl04 = 1.1e20 before RF; no H-mode
no hards this shot

Jan 18 1996 03:36:03:330PM 960118032 John Goetz Shot 960118032:
100% deuterium in A_SIDE (20PSIA)
NL04 = 0.6e20 and PG3 = 20V

Results:
plasma - all the way down
nl04 = 0.74e20 before RF
some sort of ohmic and RF H-modes

Jan 18 1996 03:45:54:770PM 960118033 John Goetz Shot 960118033:
no changes

Results:
plasma - disrupts @ 1.24
nl04 = 0.6 before ohmic H-mode; 0.73e20 before RF H-mode
hard x-rays from 0.10 to 0.23 sec

Jan 18 1996 04:13:54:040PM 960118034 John Goetz Shot 960118034:
100% hydrogen in A_SIDE (20 PSIA)
prefill puff = 12 msec

Results:
plasma - disrupts @ 1.25
nl04 = 0.75e20 before RF H-mode

Jan 18 1996 04:26:09:230PM 960118035 John Goetz Shot 960118035:
no changes

Results:
plasma - disrupts @ 1.20
nl04 = 0.73e20 before RF H-mode
very similar to 034
TF crowbar after shot

Jan 18 1996 04:48:30:780PM 960118036 John Goetz Shot 960118036:
enable LPI - firing pellets @ 0.7 and 1.0

Results:
plasma - disr. @ 0.79
small pellet, then RF
RF feedback driving the radial position in and out

Jan 18 1996 05:01:28:530PM 960118037 John Goetz Shot 960118037:
no changes

Results:
plasma - disrupts @ 0.76
RF feedback is driving RCUR nuts after the small Li pellet

Jan 18 1996 05:10:07:200PM 960118038 John Goetz Shot 960118038:
load 960118001 and setup for fiducial

Results:
dud
waveforms did not make it from the hybrid to the gas PLC

Jan 18 1996 05:18:08:820PM 960118039 John Goetz Shot 960118039:
load 960118001 and setup for fiducial and try again

Results:
plasma - all the way down
Ohmic part of the fiducial is acceptable - RF section did
not go into H-mode

Engineering Operator Comments

Shot Time Type Status Comment

1 08:45:52:470AM Plasma Ok

2 09:02:19:720AM Plasma Ok

3 09:12:06:630AM Plasma Ok

4 09:30:43:970AM Plasma Ok

5 09:40:17:970AM Plasma Ok

6 09:54:28:550AM Plasma Ok

7 10:19:12:190AM Plasma Ok

8 10:31:36:890AM Plasma Ok

9 10:48:37:390AM Plasma Ok

10 10:58:09:590AM Plasma Ok

11 11:12:31:120AM Plasma Ok

12 11:26:36:930AM Plasma Ok

13 11:38:22:130AM Plasma Bad magnet resist fault in pulse

14 11:46:59:870AM Plasma Ok

15 12:04:02:300PM Plasma Ok

16 12:15:49:850PM Plasma Ok

17 12:31:28:650PM Plasma Ok

18 12:43:33:560PM Plasma Ok

19 12:54:47:960PM Plasma Ok

20 01:11:32:700PM Plasma Ok

21 01:24:48:560PM Plasma Ok

22 01:35:05:070PM Plasma Ok Self powered circuit fired OH2u

23 01:45:41:920PM Plasma Ok

24 01:54:39:590PM Plasma Ok

25 02:06:48:590PM Plasma Ok

26 02:24:02:080PM Plasma Ok

27 02:36:49:050PM Plasma Ok

28 02:48:02:420PM Plasma Ok

29 02:57:20:480PM Plasma Ok

30 03:06:54:070PM Plasma Ok

31 03:16:46:010PM Plasma Ok

32 03:29:50:670PM Plasma Ok

33 03:39:16:160PM Plasma Ok

34 04:02:48:790PM Plasma Ok Self powered fired &comm fault OH2u OH1 comm fault.

35 04:17:11:100PM Plasma Ok TF IOC cabinet #5 self powerd circuit fired OH2, comm fault OH1

36 04:30:48:700PM Plasma Ok

37 04:48:47:440PM Plasma Ok Self powerer fired OH2u Bypass

38 05:00:56:630PM Plasma Ok

39 05:10:30:200PM Plasma Ok

Session Leader Comments
Jan 18 1996 08:53:08:890AM		Yuichi Takase	2.6T Second Harmonic H Minority Heating Mainly Density and Minority Concentration Scans
Jan 18 1996 09:00:16:380AM	960118001	Yuichi Takase	Fiducial. No E-port (dummy load breaker tripped). GPC not set up for 5.3T.
Jan 18 1996 09:07:33:190AM	960118002	Yuichi Takase	Shot 002 fiz 1st 2.6T attempt (breakdown at 4.85T)
Jan 18 1996 09:47:50:820AM	960118003	Yuichi Takase	Shot 003 440kA, nel_04=0.75, D+E didn't run together, lots of short H-modes W_EFIT=17->31kJ, beta_p=0.3->0.6 turn on RF position FB for next shot
Jan 18 1996 09:57:56:350AM	960118004	Yuichi Takase	Shot 004 fizzle
Jan 18 1996 09:59:22:070AM	960118005	Yuichi Takase	Shot 005 plasma 530kA, ohmic H-mode, RF moved plasma out (gain=-1500, target=2.9)
Jan 18 1996 10:17:49:350AM	960118006	Yuichi Takase	Shot 006 plasma 540kA, ohmic H-mode (better shot), RF FB target=3.0 nel=0.9 @ RF turn on (0.6 prog), W_EFIT=26->48kJ
Jan 18 1996 10:54:57:140AM	960118007	Yuichi Takase	Shot 007 plasma [D-port out for the rest of day (broken capacitor)] no ohmic H-mode, nel=0.9 @ RF turn on (nel prog = 1.0), FB target=3.1 W_EFIT=21->40kJ
Jan 18 1996 10:55:23:090AM	960118008	Yuichi Takase	Shot 008 plasma no RF (mistuned), nel=1.05->1.2 (nel prog = 1.2), W_EFIT=17kJ
Jan 18 1996 10:55:54:330AM	960118009	Yuichi Takase	Shot 009 fizzle
Jan 18 1996 11:12:14:180AM	960118010	Yuichi Takase	Shot 010 plasma no H-mode, nel+1.2->1.1 (nel prog = 1.2), W_EFIT=20->24kJ
Jan 18 1996 12:11:27:970PM	960118011	Yuichi Takase	Shot 011 plasma H-modes, nel=0.9 (0.8 prog), W_EFIT=21->37kJ
Jan 18 1996 12:11:45:260PM	960118012	Yuichi Takase	Shot 012 plasma added low power RF (0.1-0.6sec), nel=0.5 (0.5 prog), disr @ 0.65s moved RF FB gate start to 0.62s
Jan 18 1996 12:12:08:470PM	960118013	Yuichi Takase	Shot 013 dud mag res fault
Jan 18 1996 12:12:25:370PM	960118014	Yuichi Takase	Shot 014 plasma ohmic and RF H-modes, nel=0.6 (0.5 prog), RF trips, W_EFIT=23->36kJ
Jan 18 1996 12:12:41:140PM	960118015	Yuichi Takase	Shot 015 plasma inj @ .23, disr @ .29
Jan 18 1996 12:40:11:020PM	960118016	Yuichi Takase	Shot 016 plasma ohmic and RF H-modes, nel=0.55 (0.5 prog), lost H-mode @ 0.83s W_EFIT=20->38k
Jan 18 1996 12:40:37:440PM	960118017	Yuichi Takase	Shot 017 plasma [40%H/60%D in plenum] early disr
Jan 18 1996 01:18:38:140PM	960118018	Yuichi Takase	Shot 018 plasma ohmic and RF H-modes, nel=0.8 (0.5 prog), W_EFIT=25->44kJ
Jan 18 1996 01:18:58:120PM	960118019	Yuichi Takase	Shot 019 plasma RF H-modes, nel+0.9 (0.8 prog), W_EFIT=23->40kJ
Jan 18 1996 01:19:16:610PM	960118020	Yuichi Takase	Shot 020 plasma early disr
Jan 18 1996 01:34:24:490PM	960118021	Yuichi Takase	Shot 021 plasma no RF, no H-mode, W_EFIT=20kJ
Jan 18 1996 02:11:06:190PM	960118022	Yuichi Takase	Shot 022 plasma RF H-mode (ELMy), nel=1.0 (1.0 prog), W_EFIT=20->42kJ
Jan 18 1996 02:11:23:890PM	960118023	Yuichi Takase	Shot 023 plasma early dis
Jan 18 1996 02:11:46:710PM	960118024	Yuichi Takase	Shot 024 plasma no H-mode, nel=1.1->1.2 (1.2 prog), W_EFIT=22->27kJ
Jan 18 1996 02:34:54:320PM	960118025	Yuichi Takase	Shot 025 plasma ohmic and RF H-modes, nel=0.7 (0.5 prog), W_EFIT=25->44kJ
Jan 18 1996 02:35:28:000PM	960118026	Yuichi Takase	Shot 026 plasma [10%H/90%D in plenum] early disr
Jan 18 1996 02:48:16:240PM	960118027	Yuichi Takase	Shot 027 plasma RF H-mode, nel=1.1->1.2 (1.2 prog), W_EFIT=20->43kJ
Jan 18 1996 05:12:08:710PM	960118028	Yuichi Takase	Shot 028 plasma RF H-mode, nel=0.8 (0.8 prog), W_EFIT=20->38kJ
Jan 18 1996 05:12:24:970PM	960118029	Yuichi Takase	Shot 029 plasma early disr
Jan 18 1996 05:12:42:160PM	960118030	Yuichi Takase	Shot 030 plasma RF H-mode, nel=1.0 (1.0 prog), W_EFIT=21->40kJ
Jan 18 1996 05:13:00:290PM	960118031	Yuichi Takase	Shot 031 plasma RF H-mode, nel=1.1 (1.2 prog), W_EFIT=20->26kJ
Jan 18 1996 08:49:24:370PM	960118031	Yuichi Takase	Shot 031 plasma correction: no H-mode, nel=1.1 (1.2 prog), W_EFIT=20->26kJ
Jan 18 1996 05:13:31:030PM	960118032	Yuichi Takase	Shot 032 plasma [100%D in plenum] RF H-mode, nel=0.75 (0.6 prog), W_EFIT=21->39kJ
Jan 18 1996 05:14:01:460PM	960118033	Yuichi Takase	Shot 033 plasma [100%H in plenum] RF H-mode, nel=0.75 (0.6 prog), W_EFIT=22->45kJ
Jan 18 1996 06:13:56:520PM	960118033	Yuichi Takase	Shot 033 plasma RF H-mode, nel=0.75 (0.6 prog), W_EFIT=21->43kJ (previous entry was really for Shot 034)
Jan 18 1996 05:14:21:700PM	960118034	Yuichi Takase	Shot 034 plasma RF H-mode, nel=0.7 (0.6 prog), W_EFIT=20->42kJ
Jan 18 1996 06:14:32:840PM	960118034	Yuichi Takase	Shot 034 plasma [100%H in plenum] RF H-mode, nel=0.75 (0.6 prog), W_EFIT=22->45kJ (previous entry was really for Shot 035)
Jan 18 1996 05:14:41:480PM	960118035	Yuichi Takase	Shot 035 plasma Li pellet @ 0.685, RF @ 0.700 sec, disrupt, W_EFIT=20->33kJ
Jan 18 1996 06:14:53:990PM	960118035	Yuichi Takase	Shot 035 plasma RF H-mode, nel=0.7 (0.6 prog), W_EFIT=20->42kJ (previous entry was really for Shot 036)
Jan 18 1996 05:14:57:760PM	960118036	Yuichi Takase	Shot 036 plasma Li pellet @ 0.685, RF @ 0.700 sec, disrupt
Jan 18 1996 06:15:15:060PM	960118036	Yuichi Takase	Shot 036 plasma Li pellet @ 0.685, RF @ 0.700 sec, disrupt, W_EFIT=20->33kJ (previous entry was really for Shot 037)
Jan 18 1996 05:15:44:680PM	960118037	Yuichi Takase	Shot 037 dud fiducial (no gas)
Jan 18 1996 06:15:36:790PM	960118037	Yuichi Takase	Shot 037 plasma Li pellet @ 0.685, RF @ 0.700 sec, disrupt (previous entry was really for Shot 038)
Jan 18 1996 06:18:26:110PM	960118038	Yuichi Takase	Shot 038 dud fiducial attempt (didn't get gas)
Jan 18 1996 06:18:46:780PM	960118039	Yuichi Takase	Shot 039 plasma fiducial, no H-mode

Physics Operator Comments
Jan 18 1996 08:24:35:040AM		John Goetz	Run 960118: Mini-proposal #118 - ICRF Heated H-Mode at 2.6T The primary objective of this mini-proposal is to explore the possibility of achieving improved H-factors by operating at lower values of nebar*Bt. A secondary objective is to study sawtooth stabilization using this heating scheme. Plan: establish a 2.6T shot that can be heated H minority scan at fixed density scan density at best H concentration study sawtooth stabilization
Jan 18 1996 08:53:12:100AM	960118001	John Goetz	Shot 960118001: Load 960117018 for a fiducial Results: acceptable fiducial ECE has grating for 2.6T
Jan 18 1996 09:10:50:800AM	960118002	John Goetz	Shot 960118002: Load 951218006 14 msec prefill puff on PG4 NL_04 = 0.6e20 IP = -450000 V_OH1 = 170V from .005 to .015 Results: fizzle - late breakdown radial field a little negative CII light 2x shot 001 - no sign of a burnout
Jan 18 1996 09:30:43:060AM	960118003	John Goetz	Shot 960118003: BR_0 offset = .007 (was .0064) prefill puff = 11 msec (was 14) Results: plasma - disr. @ 1.17 sec Ip = 0.45MA; Bt = 2.6T -> q=4 H-modes; only one transmitter stayed on
Jan 18 1996 09:41:34:690AM	960118004	John Goetz	Shot 960118004: IP = -550000 RF_LOAD_E = -1500 in RCUR extend all P's and V's to 1.2sec Results: fizzle (strong) z-meter array says it moves out and hits something Bz not coming in fast enough
Jan 18 1996 09:54:02:050AM	960118005	John Goetz	Shot 960118005: prefill puff = 13msec Results: plasma - disr. @ 0.85sec (q = 3.2) ohmic H-mode @ 0.45 vertical oscillation beginning at 0.75
Jan 18 1996 10:09:28:690AM	960118006	John Goetz	Shot 960118006: BR_0 offset = .0066 Results: plasma - disrupts @ 1.17sec plasma current is drooping and q drops below 3 antenna position feedback better
Jan 18 1996 10:32:12:500AM	960118007	John Goetz	Shot 960118007: start density scan - NL_04 = 1.0e20 ramp IP to -570000 to keep current constant extend gains! on wires to accomodate 1.2sec pulse Results: plasma - disrupts @ 1.21 better control of the x-point - q remains above 3 no D-port antenna for the rest of the day nl_04 = 0.85e20 before RF - no ohmic H-mode
Jan 18 1996 11:12:42:690AM	960118009	John Goetz	Shot 960118009: PG3 = 50V Results: fizzle (weak) too much prefill gas (last shot was high density) fields o.k.
Jan 18 1996 11:08:41:630AM	960118010	John Goetz	Shot 960118010: prefill puff = 11msec Results: plasma - disrupts @ 1.31 nl04 = 1.16e20 before RF no H-mode
Jan 18 1996 11:38:13:560AM	960118011	John Goetz	Shot 960118011: TF invert = 1.45 sec NL04 = 0.8e20 PG3 = 40V Results: plasma - disrupts @ 1.17 (must not be related to the TF invert) multiple H-ELMy H transitions
Jan 18 1996 11:39:33:160AM	960118012	John Goetz	Shot 960118012: NL04 = 0.5e20 PG3 = 25V prefill puff = 12msec PG1 = 20msec Results: plasma - disrupts @ 0.66 just after high power RF turn-on; possibly RF position feedback related
Jan 18 1996 11:40:30:450AM	960118013	John Goetz	Shot 960118013: no changes Results: dud - magnetic resistance fault
Jan 18 1996 11:57:45:760AM	960118014	John Goetz	Shot 960118014: try again Results: plasma - disrupts @ 0.89sec vertical and radial oscillations begin at 0.8sec thermal quench @ 0.8sec outer gap = 1mm when all this happens
Jan 18 1996 12:14:36:150PM	960118015	John Goetz	Shot 960118015: RF loading to 3.2 Ohms Results: plasma - disrupts @ 0.28 something moves through the plasma @ 0.23 sec - more than likely it is Mo
Jan 18 1996 12:33:11:330PM	960118016	John Goetz	Shot 960118016: prefill puff = 13 msec Results: plasma - disrupts @ 1.06 sec RF stays on - drops out of ELM-free H-mode @ 0.82 sec possible Mo injection death
Jan 18 1996 12:42:14:060PM	960118017	John Goetz	Shot 960118017: 40% H / 60% D in A_SIDE (was 20% H / 80% D) Results: plasma - disrupts @ 0.303 sec looks like something comes in to the plasma @ 0.276 sec
Jan 18 1996 01:09:05:340PM	960118018	John Goetz	Shot 960118018: chopper start time = -.005 sec (was +.06 sec) let NL04 overshoot then come back down Results: plasma - disrupts @ 1.06 ohmic and RF H-mode
Jan 18 1996 01:09:41:770PM	960118019	John Goetz	Shot 960118019: NL04 = 0.8e20 and PG3 = 30V Results: plasma - disrupts @ 1.30 NL04 = 0.86 before RF RF H-mode only
Jan 18 1996 01:22:09:670PM	960118020	John Goetz	Shot 960118020: NL04 = 1.0e20 and PG3 = 40V Results: plasma - disrupts @ 0.46 sec discharge doesn't want to take up the gas
Jan 18 1996 01:32:14:000PM	960118021	John Goetz	Shot 960118021: prefill puff = 12 msec PG3 = 45V Results: plasma - disrupts @ 1.33 NL04 = 1.e20 no high power RF
Jan 18 1996 01:43:38:080PM	960118022	John Goetz	Shot 960118022: prefill puff = 11 msec Results: plasma - disrupts @ 1.15 NL04 = 1e20 before RF RF H-mode (ELMy)
Jan 18 1996 01:51:47:070PM	960118023	John Goetz	Shot 960118023: prefill puff = 10 msec NL04 = 1.2e20 and PG3 = 55V Results: plasma - disrupts @ 0.32 sec Dalpha saturates beginning @ 0.2 - probably gassed this one to death
Jan 18 1996 02:03:04:490PM	960118024	John Goetz	Shot 960118024: drop PG3 to 40V from 0.1 to 0.3 sec Results: plasma - disrupts @ 1.31 NL04 = 1.2e20 RF pulse - no H-mode
Jan 18 1996 02:18:29:160PM	960118025	John Goetz	Shot 960118025: NL04 = 0.5e20 and PG3 = 20V Results: plasma - disrupts @ 1.29 NL04 = 0.72e20 when the ohmic H-mode occurs - must be wall fueling because the gas is off RF H-mode
Jan 18 1996 02:40:09:890PM	960118026	John Goetz	Shot 960118026: 10% H / 90% D in A_SIDE (20PSIA total) move NL04 overshoot point to 0.2sec Results: plasma - disrupts @ .502 sec nl04 = 0.5e20
Jan 18 1996 02:41:37:250PM	960118027	John Goetz	Shot 960118027: turn on ZXL gain more slowly (jump in EF1L @ .114 sec) Results: plasma - disrupts @ 1.22 sec nl04 = 0.54e20 when RF turns on no ohmic H-mode; RF H-mode
Jan 18 1996 02:54:50:850PM	960118028	John Goetz	Shot 960118028: NL04 = 0.8e20 and PG3 = 30V Results: plasma - disrupts @ 1.19 nl04 = 0.84e20 before RF H-mode
Jan 18 1996 03:04:28:970PM	960118029	John Goetz	Shot 960118029: NL04 = 1.0e20 and PG3 = 40V Results: plasma - disrupts @ 0.32 Dalpha saturated from 0.2 sec onward - very similar shot to 023; too much gas
Jan 18 1996 03:14:22:940PM	960118030	John Goetz	Shot 960118030: reduce PG3 from 0.1 to 0.3 sec Results: plasma - disrupts @ 1.23 nl04 = 1.0e20 before RF H-mode hard x-rays from 0.14 to 0.20 sec
Jan 18 1996 03:27:56:690PM	960118031	John Goetz	Shot 960118031: NL04 = 1.2e20 and PG3 = 50V Results: plasma - disrupts @ 1.31 nl04 = 1.1e20 before RF; no H-mode no hards this shot
Jan 18 1996 03:36:03:330PM	960118032	John Goetz	Shot 960118032: 100% deuterium in A_SIDE (20PSIA) NL04 = 0.6e20 and PG3 = 20V Results: plasma - all the way down nl04 = 0.74e20 before RF some sort of ohmic and RF H-modes
Jan 18 1996 03:45:54:770PM	960118033	John Goetz	Shot 960118033: no changes Results: plasma - disrupts @ 1.24 nl04 = 0.6 before ohmic H-mode; 0.73e20 before RF H-mode hard x-rays from 0.10 to 0.23 sec
Jan 18 1996 04:13:54:040PM	960118034	John Goetz	Shot 960118034: 100% hydrogen in A_SIDE (20 PSIA) prefill puff = 12 msec Results: plasma - disrupts @ 1.25 nl04 = 0.75e20 before RF H-mode
Jan 18 1996 04:26:09:230PM	960118035	John Goetz	Shot 960118035: no changes Results: plasma - disrupts @ 1.20 nl04 = 0.73e20 before RF H-mode very similar to 034 TF crowbar after shot
Jan 18 1996 04:48:30:780PM	960118036	John Goetz	Shot 960118036: enable LPI - firing pellets @ 0.7 and 1.0 Results: plasma - disr. @ 0.79 small pellet, then RF RF feedback driving the radial position in and out
Jan 18 1996 05:01:28:530PM	960118037	John Goetz	Shot 960118037: no changes Results: plasma - disrupts @ 0.76 RF feedback is driving RCUR nuts after the small Li pellet
Jan 18 1996 05:10:07:200PM	960118038	John Goetz	Shot 960118038: load 960118001 and setup for fiducial Results: dud waveforms did not make it from the hybrid to the gas PLC
Jan 18 1996 05:18:08:820PM	960118039	John Goetz	Shot 960118039: load 960118001 and setup for fiducial and try again Results: plasma - all the way down Ohmic part of the fiducial is acceptable - RF section did not go into H-mode

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:45:52:470AM	Plasma	Ok
2	09:02:19:720AM	Plasma	Ok
3	09:12:06:630AM	Plasma	Ok
4	09:30:43:970AM	Plasma	Ok
5	09:40:17:970AM	Plasma	Ok
6	09:54:28:550AM	Plasma	Ok
7	10:19:12:190AM	Plasma	Ok
8	10:31:36:890AM	Plasma	Ok
9	10:48:37:390AM	Plasma	Ok
10	10:58:09:590AM	Plasma	Ok
11	11:12:31:120AM	Plasma	Ok
12	11:26:36:930AM	Plasma	Ok
13	11:38:22:130AM	Plasma	Bad	magnet resist fault in pulse
14	11:46:59:870AM	Plasma	Ok
15	12:04:02:300PM	Plasma	Ok
16	12:15:49:850PM	Plasma	Ok
17	12:31:28:650PM	Plasma	Ok
18	12:43:33:560PM	Plasma	Ok
19	12:54:47:960PM	Plasma	Ok
20	01:11:32:700PM	Plasma	Ok
21	01:24:48:560PM	Plasma	Ok
22	01:35:05:070PM	Plasma	Ok	Self powered circuit fired OH2u
23	01:45:41:920PM	Plasma	Ok
24	01:54:39:590PM	Plasma	Ok
25	02:06:48:590PM	Plasma	Ok
26	02:24:02:080PM	Plasma	Ok
27	02:36:49:050PM	Plasma	Ok
28	02:48:02:420PM	Plasma	Ok
29	02:57:20:480PM	Plasma	Ok
30	03:06:54:070PM	Plasma	Ok
31	03:16:46:010PM	Plasma	Ok
32	03:29:50:670PM	Plasma	Ok
33	03:39:16:160PM	Plasma	Ok
34	04:02:48:790PM	Plasma	Ok	Self powered fired &comm fault OH2u OH1 comm fault.
35	04:17:11:100PM	Plasma	Ok	TF IOC cabinet #5 self powerd circuit fired OH2, comm fault OH1
36	04:30:48:700PM	Plasma	Ok
37	04:48:47:440PM	Plasma	Ok	Self powerer fired OH2u Bypass
38	05:00:56:630PM	Plasma	Ok
39	05:10:30:200PM	Plasma	Ok