Alcator C-Mod Run 1040212 Information

Miniproposals

Miniproposal: 380

Date Filed: 12/19/2003

Title: Influence of ICRF on sawtooth behavior

First Author: Steve Wukitch

Session Leader: Steve Wukitch (shots 33-34)

Miniproposal: 388

Date Filed: 2/5/2004

Title: Plasma performance optimization by impurity control

First Author: Yijun Lin

Session Leader: Yijun Lin (shots 1-32)

Operators
Session leader(s):	Yijun Lin,Steve Wukitch
Physics operator(s):	Joseph Snipes
Engineering operator(s):	Gary Dekow,Ed Fitzgerald

Engineering Operator Run Comment
MP 355/ MP 388 Boron Rec. and more SL:Wukitch/Lin; PO:Snipes; EO:Dekow/F

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:02:757PM

Author: Yijun Lin

Run summary:

FMIT #4 crowbar cabinet and high yard breakers, etc, were repaired from
the accident 1040109. More than 2 MW power were reliably delivered from
J-antenna.

We successfully preduced several shots with very high stored energy. Shot 23
and shot 30 are ranked as the 3rd and 4th in stored energy
in all C-Mod shots.

Only 4.3 MW rf was applied to get 227 kJ in shot 23. Some effect was
tried to break the record Wmhd level, but unsuccessful due to unpredictable
trips from either E or J antennas at high power. Total 7 shots with
stored energy higher than 200 kJ were achieved in this run. H-factor at
1.7-2.1 is the norm late in the run.

Previous shots with highest stored energy
(980217015, Wmhd_max = 234 kJ, Prf = 3.5 MW
1001013002: Wmhd_max = 233 kJ, Prf = 5.1 MW)

This run:

1040212023: Wmhd_max = 227 kJ, Prf = 4.3 MW
1040212030: Wmhd_max = 228 kJ, Prf = 5.1 MW

-----------
The gas puff rate change seems not to preduce significantly better
performance, but nonetheless, slightly better.
Shot 13 and 10 at max gas puff rate had 128-130 kJ Wmhd,
while shot 11 and 12 at usual gas puff rate had 118-123 kJ Wmhd at 2
MW power from D and E. (Note preboronization, the stored energy
is at 110 kJ level).

Several disruptions occurs at higher power due to injections.
It is avoided after moving
the outer striking point from divertor floor to the outer divertor plate.
This change may also have reduced the impurity level at high power, and
resulted better performance.

Note Zeff in shot 1 was closed to 1, but it went up to 2 in only a couple
of shots. Based on the experiments with Nitrogen puff in yesterday,
such rapid increase of Zeff is likely caused by some unidentified high-Z
impurity source. More detective work is still needed.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:48:973PM

Author: Joseph Snipes

Session leader: Y. Lin - S. Wukitch
Physics operator: J. A. Snipes

Overnight boronization. No cell access after Wednesday's run until 7:00 am Thursday.

Run begins at 09:00 and ends at 17:00.

Power systems the same as 1040209001

A-coils as on 1040107004.

Gas setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid enabled (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill C-side with 30 psi D2 Hybrid enabled (PG3)

Enable the following gate valves, assuming no vacuum problems:
ECE, VUV, DNB

Run plan:

Start with shot 1040211009. Run MP 355 Boronization Recovery and ICRF Conditioning
followed by the post-boronization part of MP 388. Note that we do NOT want to do the
N2 puffing part of this MP in the post-boronization run. If there is in fact time
remaining, the remainder of the run should be spent trying to get #3 and 4 back in
operation. If this is successful, then we will start on either MP 380 (sawtooth
effect) or MP 379 (high power ICRF).

Summary:

The run started out well for the first 8 shots, then there was a dud for unknown
reasons. Then, there were a numbers of fizzles and another dud during the rest of
the day. Nonetheless, the RF worked reasonably well in that several shots reached
up to 5 MW or so and near record neutron rates and stored energies were obtained.
A neutron alert was issued already on shot 10 so the machine was quite activated by
the end of the run. It was not clear what was responsible for all of the fizzles and
duds. I found Bz changing and adjusted EF4 down as low as -1350 A. There was also
a data system problem after shot 31 that delayed the run for about 15 minutes or so.
A few shots also had problems with the TCI and density feedback was lost on shot 24.
Despite the difficulties, it was a fairly good run for a post-boronization ICRF
conditioning run.

Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax
1 1.940 1.051 2 1.944 1.049
3 1.943 1.056 4 1.944 1.055
5 1.946 1.059 6 1.947 1.059
7 1.947 1.063 8 1.946 1.066
9 0.000 0.033 10 1.952 1.056
11 1.953 1.056 12 1.954 1.060
13 1.953 1.056 14 0.000 0.048
15 0.000 0.050 16 1.952 1.065
17 0.000 0.042 18 0.786 1.141
19 0.000 0.045 20 0.990 1.069
21 0.000 0.039 22 0.000 0.045
23 1.959 1.071 24 1.868 1.069
25 1.946 1.072 26 1.949 1.067
27 0.000 0.040 28 1.957 1.068
29 1.954 1.065 30 1.954 1.069
31 0.000 0.054 32 1.960 1.068
33 1.959 1.069 34 0.000 0.060

Finished summary for 1040212 Total of 34 shots.
34 shots. 24 plasmas. 8 fizzles. 2 duds.

Shot 1: Copied entire shot 1040211009. Good shot.
Shot 2: Raised Ip at 0.1 s in Segment 2 to 0.6 MA to match the actual current ramp and avoid the current dip
just after the segment switch. Good shot. Current rise is much better.
Shot 3: Repeat. Good shot.
Shot 4: Repeat. Good shot, though there was a problem with the data from the bus rogowskis.
Shot 5: Repeat. Good shot.
Shot 6: Repeat. Good shot.
Shot 7: Repeat. Good shot.
Shot 8: Repeat. Good shot.
Shot 9: Repeat. Dud! Sparker seems to be arcing wildly.
Shot 10: Repeat. Good shot.
Shot 11: Loaded shot 1040211015 in all segments. Good shot. Nice long EDA H-mode.
Shot 12: Repeat. Very similar good shot.
Shot 13: Reload shot 1040212010 from today. Good shot.
Shot 14: Repeat. Fizzle!
Shot 15: Increased Br0 by 0.3 mT to 0.8 mT. Decreased prepuff by 1 ms to 14 ms duration. Reduced nl04 to
7.5 x 10^19 m^-2. Fizzle!
Shot 16: Try increasing the prepuff to 17 ms duration. Good shot. Earlier breakdown.
Shot 17: Increased prepuff by another ms to 18 ms duration. Fizzle. Again a late breakdown.
Shot 18: Return to Br0 = 0.5 mT and 17 ms prepuff. Got plasma, but it disrupted at 0.783 s during the RF.
Shot 19: Repeat. Fizzle!
Shot 20: Reduced Br0 by another 0.2 mT to 0.3 mT. Got plasma but it disrupted at 0.986 sec.
Shot 21: Try reducing the prepuff to 14 ms duration to avoid a fizzle. Dud!
Shot 22: Return prepuff to 17 ms duration. Increase RXL by 2cm to 0.02 m from 0.35 to 1.5 s. Fizzle. Late
breakdown.
Shot 23: Reduced EF4 current by 10 A to -1345 A. Good shot. Breakdown at the usual time.
Shot 24: Reduced segment 1 pre-programmed gas puff from 100 V to 40 V. Reduced RXL by 1 cm to 0.01 m.
Good shot, but we lost the TCI density feedback so there were strong gas puffs during the H-mode.
Shot 25: Reduced RXL by another 2 mm to 0.008 m. Good shot.
Shot 26: Repeat. Good shot, though the RF tripped shortly after reaching 4 MW.
Shot 27: Raised pre-programmed gas puff in segment 1 to 100 V again and increased nl04 to 8.5 x 10^19 m^-2.
Late breakdown again with a fizzle.
Shot 28: Increased Br0 by 0.2 mT again back to 0.5 mT. Reduced EF4 current again to -1350 A. Good shot.
The RF tripped at high power again.
Shot 29: Repeat. Good shot. Late breakdown again.
Shot 30: Reduced prepuff to 15 ms duration. Good shot. Breakdown back to the normal time.
Shot 31: Reduced nl04 to 8 x 10^19 m^-2. Late breakdown and a fizzle!
Shot 32: Try again. Increased prepuff to 17 ms duration. Good shot.
Shot 33: Moving to Wukitch's MP 380 on Sawteeth. Lowered ZXU to 0.02 from 0.05 m. Lowered TF current to 142 kA
from 150 kA to provide 5.2 T. Good shot. Multiple H-modes. SSEP only down to - 0.8 from -2.
Shot 34: Reduced ZXU to 0.5 cm to further reduce SSEP and get closer to double null. Fizzle!

Session Leader Comments

Feb 13 2004 09:27:33:550AM Yijun Lin run summary:

FMIT #4 crowbar cabinet and high yard breakers, etc, were repaired from
the accident 1040109. More than 2 MW power were reliably delivered from
J-antenna.

We successfully preduced several shots with very high stored energy. Shot 23
and shot 30 are ranked as the 3rd and 4th in stored energy
in all C-Mod shots.

Only 4.3 MW rf was applied to get 227 kJ in shot 23. Some effect was
tried to break the record Wmhd level, but unsuccessful due to unpredictable
trips from either E or J antennas at high power. Total 7 shots with
stored energy higher than 200 kJ were achieved in this run. H-factor at
1.7-2.1 is the norm late in the run.

Previous shots with highest stored energy
(980217015, Wmhd_max = 234 kJ, Prf = 3.5 MW
1001013002: Wmhd_max = 233 kJ, Prf = 5.1 MW)

This run:

1040212023: Wmhd_max = 227 kJ, Prf = 4.3 MW
1040212030: Wmhd_max = 228 kJ, Prf = 5.1 MW

-----------
The gas puff rate change seems not to preduce significantly better
performance, but nonetheless, slightly better.
Shot 13 and 10 at max gas puff rate had 128-130 kJ Wmhd,
while shot 11 and 12 at usual gas puff rate had 118-133 kJ Wmhd at 2
MW power from D and E. (Note preboronization, the stored energy
is at 110 kJ level).

Several disruptions occurs at higher power due to injections.
It is avoided after moving
the outer striking point from divertor floor to the outer divertor plate.
This change may also have reduced the impurity level at high power, and
resulted better performance.

Note Zeff in shot 1 was closed to 1, but it went up to 2 in only a couple
of shots. Based on the experiments with Nitrogen puff in yesterday,
such rapid increase of Zeff is likely caused by some unidentified high-Z
impurity source. More detective work is still needed.

Feb 12 2004 02:10:25:820PM 1040212001 Yijun Lin shot 1:
Request: Load shot 1040211009
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.

RF power: Standard fiducial rf waveform. Step up to 4 MW.

Max gas puff in segment 1.

Result: Long EDA H-mode. (injection at 0.1 sec)
Max Wmhd 116 kJ @ Prf ~ 2 MW
Got power from J antenna!

Zeff ~ 1.1
Next: same plasma, same rf waveform to recover antennas from boronization

Feb 12 2004 02:11:04:497PM 1040212002 Yijun Lin shot 2: (post-boronization recovery)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.

RF power: Standard fiducial rf waveform. Step up to 4 MW.

Max gas puff in segment 1.

Result: Long EDA H-mode.
Plasma performance seemed to be the same as yesterday.

Zave up to 1.6
Next: raise RF power.

Feb 12 2004 09:47:48:993AM 1040212003 Yijun Lin shot 3:(post-boronization recovery)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: rf steps, 2.8 MW to 4.4 MW

Max gas puff in segment 1.

Result: Long EDA H-mode.
Max Wmhd 131 kJ @ Prf ~ 3.3 MW
Zave ~ 1.5 (lower than yesterday, which was about 2)
Next shot: raise RF power.

Feb 12 2004 10:04:31:290AM 1040212004 Yijun Lin shot 4:(post-boronization recovery)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: rf steps, 2.8 MW to 4.4 MW

Max gas puff in segment 1.

Result: Long EDA H-mode.
Max Wmhd 175 kJ @ Prf ~ 5 MW
Zeff ~ 1.8
Next shot: repeat.

Feb 12 2004 10:25:27:303AM 1040212005 Yijun Lin shot 5:(post-boronization recovery)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: rf steps, 3 MW to 5 MW

Max gas puff in segment 1.

Result: Long EDA H-mode.
Max Wmhd 178kJ @ Prf ~ 5. MW
Zeff ~ 1.8
Next shot: repeat.

Feb 12 2004 10:33:40:323AM 1040212006 Yijun Lin shot 6:(post-boronization recovery)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: rf steps, 3.6 MW to 5.8 MW

Max gas puff in segment 1.

Result: Long EDA H-mode.
Max Wmhd 183kJ @ Prf ~ 5.1 MW
Zeff ~ 1.6

Feb 12 2004 10:48:31:487AM 1040212007 Yijun Lin shot 7:(post-boronization recovery)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: rf steps, 4 MW to 6 MW

Max gas puff in segment 1.

Result: Long EDA H-mode.
Max Wmhd 190kJ @ Prf ~ 5. MW
Zeff ~ 1.7

Feb 12 2004 11:00:12:953AM 1040212008 Yijun Lin
shot 8:(post-boronization recovery)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: rf steps, 4.5 MW to 6 MW

Max gas puff in segment 1.

Result: 2 H-modes
Max Wmhd 160kJ. Many rf trips.
Zeff ~ 1.8
An injection at about 1.05 sec caused H-L transition. (Zave to 2.3)
2nd injection at 1.2 sec may come from J-port.

Feb 12 2004 11:17:55:973AM 1040212009 Yijun Lin shot 9:(post-boronization recovery)
dud
Next: start MP388 part 2.

Feb 12 2004 11:28:38:427AM 1040212010 Yijun Lin shot 10: (start MP 388 part 2) (compare boronization effect.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 2 MW from D and E. (same as 1040211009)

Max gas puff in segment 1.

Result: 2 EDA H-modes
Wmhd at 128 kJ. (Compared ~ 110 kJ pre-boronization).
There was an injection at 0.1 sec.
Next: load 1040211015, which has a smaller segment 1 gas puff.

Feb 12 2004 11:38:36:613AM 1040212011 Yijun Lin shot 11: (MP 388 part 2) (compare boronization effect.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 2 MW from D and E. (same as 1040211015)

Lower gas puff in segment 1. (rate 27 torr-liter/s)

Result: Wmhd at 118 kJ. (Compared ~ 110 kJ pre-boronization).
There was injections at 0.1 sec.
Next: repeat to have one more data point.

Feb 12 2004 11:49:47:300AM 1040212012 Yijun Lin shot 12: (MP 388 part 2) (boronization effect.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 2 MW from D and E. (same as 1040211015)

low gas puff in segment 1. (rate 27 torr-liter/s)

Result: Wmhd at 123 kJ. (Compared ~ 110 kJ pre-boronization).

Next: repeat shot 10, which has a higher gas puff in segment 1.

Feb 12 2004 11:50:38:390AM 1040212012 Yijun Lin shot 12: (MP 388 part 2) (boronization effect.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 2 MW from D and E. (same as 1040211015)

low gas puff in segment 1. (rate 27 torr-liter/s)

Result: Wmhd at 123 kJ. (Compared ~ 110 kJ pre-boronization).

Next: repeat shot 10, which has a higher gas puff in segment 1.

Feb 12 2004 12:04:19:560PM 1040212013 Yijun Lin shot 13: (MP 388 part 2) (boronization and gas puff effects.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 2 MW from D and E. (same as 1040211015)
Max gas puff in segment 1.

Result: Wmhd at 130 kJ. (Compared ~ 110 kJ pre-boronization
and 123 kJ previous shot).

Next: Raise rf power to 4 MW

Feb 12 2004 12:14:48:320PM 1040212014 Yijun Lin fizzle

Feb 12 2004 12:27:41:050PM 1040212015 Yijun Lin fizzle

Feb 12 2004 12:47:43:300PM 1040212016 Yijun Lin shot 16:(MP 388 part 2) (boronization and gas puff effects.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 4.25 MW from D, E and J.
Max gas puff in segment 1.

Result: Wmhd at 185 kJ @ 4.2 MW. H factor 1.9 for two EFIT points.
Next: repeat at higher power.

Feb 12 2004 12:53:57:190PM 1040212017 Yijun Lin fizzle

Feb 12 2004 01:08:46:117PM 1040212018 Yijun Lin
shot 18:(MP 388 part 2) (boronization and gas puff effects.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 5 MW from D, E and J.
Max gas puff in segment 1.

Result: disrupted at 0.78 sec (injection).
Next: repeat.

Feb 12 2004 01:19:52:027PM 1040212019 Yijun Lin fizzle

Feb 12 2004 01:56:44:900PM 1040212020 Yijun Lin shot 20:
(MP 388 part 2) (boronization and gas puff effects.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 4.6 MW from D, E and J.
Max gas puff in segment 1.
Result: Wmhd at 218 kJ @ Prf 4.6 MW.
Big injection ('shooting star' seen by WIDE2) caused disruption at 0.97 sec.
H factor 1.7-2.0 before injection.
Next: repeat.

Feb 12 2004 01:58:53:987PM 1040212021 Yijun Lin dud. (presumably due to the disruption in the previous shot).
Brian said that we'd better move the strike point to the outer divertor plate
instead of the floor (to avoid hot spot on the floor, which may have
been the source of injection at high rf power). Try this next shot.

Feb 12 2004 01:58:35:250PM 1040212022 Yijun Lin fizzle

Feb 12 2004 02:18:59:500PM 1040212023 Yijun Lin shot 23:
(MP 388 part 2) (boronization and gas puff effects.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 4.6 MW from D, E and J.
Max gas puff in segment 1.
Result: Wmhd at 227 kJ @ Prf 4.3 MW.

H factor > 2 for a while. Neutron rate > 1e14
Next: reduce segment 1 puff to 40. (usual level in 02 and 03)
See whether we can still get this level.

Feb 12 2004 02:31:13:700PM 1040212024 Yijun Lin shot 24:
(MP 388 part 2) (boronization and gas puff effects.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 4.6 MW from D, E and J.
Lowre gas puff rate in segment 1.
Result: Wmhd at 206 kJ @ Prf 5 MW.
density signal lost (bad feedback control).
Next: repeat.

Feb 12 2004 02:46:03:460PM 1040212025 Yijun Lin shot 25:
(MP 388 part 2) (boronization and gas puff effects.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 4.6 MW from D, E and J.
Lower gas puff rate in segment 1.
Result: Wmhd at 190 kJ @ Prf 4.8 MW.
Lost density control again.

Next: repeat.

Feb 12 2004 03:09:19:300PM 1040212026 Yijun Lin shot 26:
(MP 388 part 2) (boronization and gas puff effects.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 4.6 MW from D, E and J.
Low gas puff rate in segment 1.
Result: Wmhd at 182 kJ @ Prf 3.5 MW.
H factor at about 1.7.
Performance seems to be insensentive to the gas puff.

Next: Back to max puff rate in segment 1 and raise target density to 0.85e20.
Also raise rf power a little.

Can we break the record Stored energy level?
980217015, Wmhd_max = 234 kJ, Prf = 3.5 MW
1001013002: Wmhd_max = 233 kJ, Prf = 5.1 MW

Feb 12 2004 03:09:45:487PM 1040212027 Yijun Lin fizzle

Feb 12 2004 03:28:18:100PM 1040212028 Yijun Lin shot 28:
(MP 388 part 2) (boronization and gas puff effects.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.85e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 5.0 MW from D, E and J.
Max gas puff rate in segment 1.
Result: Wmhd at 190 kJ @ Prf 4-5 MW (E port many trips).
Wmhd at 157 kJ later with 3 MW from D + E.
H factor at about 1.5-1.7.

Next: repeat to have better RF.

Feb 12 2004 03:40:01:597PM 1040212029 Yijun Lin shot 29:
(MP 388 part 2) (boronization and gas puff effects.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.85e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 5.0 MW from D, E and J.
Max gas puff rate in segment 1.
Result: Wmhd at 220 kJ @ Prf 5.1 MW (J port many trips).

Next: repeat. hopefully, better rf.

Feb 12 2004 03:54:32:230PM 1040212030 Yijun Lin shot 30:
(MP 388 part 2) (boronization and gas puff effects.)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.85e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 5.0 MW from D, E and J.
Max gas puff rate in segment 1.
Result: Wmhd at 228 kJ @ Prf 5.2 MW (E port tripped too early).
Hfactor ~ 1.8,one long H-mode
Next: repeat. Lower E port power. Raise J port power. And lower target
density to 0.8e20 n^-2.

Feb 12 2004 04:00:02:550PM 1040212031 Yijun Lin fizzle

Feb 12 2004 04:44:59:200PM 1040212032 Yijun Lin shot 32: (delayed by a computer problem)
(MP 388 part 2) (Trying to break the record of stored energy)
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.8e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: 5.0 MW from D, E and J.
Max gas puff rate in segment 1.
Result: Wmhd at 217 kJ @ Prf 3.6 to 5 MW (E port many trips).
Hfactor ~ 1.8-2.0, one long H-mode

Done on MP388.

Next: SL: Wukitch on monster sawteeth in double null plasmas.

Physics Operator Comments

Feb 12 2004 08:30:34:280AM Joseph Snipes Session leader: Y. Lin - S. Wukitch
Physics operator: J. A. Snipes

Overnight boronization. No cell access after Wednesday's run until 7:00 am Thursday.

Run begins at 09:00 and ends at 17:00.

Power systems the same as 1040209001

A-coils as on 1040107004.

Gas setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid enabled (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill C-side with 30 psi D2 Hybrid enabled (PG3)

Enable the following gate valves, assuming no vacuum problems:
ECE, VUV, DNB

Run plan:

Start with shot 1040211009. Run MP 355 Boronization Recovery and ICRF Conditioning
followed by the post-boronization part of MP 388. Note that we do NOT want to do the
N2 puffing part of this MP in the post-boronization run. If there is in fact time
remaining, the remainder of the run should be spent trying to get #3 and 4 back in
operation. If this is successful, then we will start on either MP 380 (sawtooth
effect) or MP 379 (high power ICRF).

Feb 12 2004 09:09:07:463AM 1040212001 Joseph Snipes Shot 1: Copied entire shot 1040211009. Good shot.

Feb 12 2004 09:33:11:180AM 1040212002 Joseph Snipes Shot 2: Raised Ip at 0.1 s in Segment 2 to 0.6 MA to match the actual current ramp and avoid the current dip
just after the segment switch. Good shot. Current rise is much better.

Feb 12 2004 09:56:55:287AM 1040212003 Joseph Snipes Shot 3: Repeat. Good shot.

Feb 12 2004 09:58:13:203AM 1040212004 Joseph Snipes Shot 4: Repeat. Good shot, though there was a problem with the data from the bus rogowskis.

Feb 12 2004 10:08:05:470AM 1040212005 Joseph Snipes Shot 5: Repeat. Good shot.

Feb 12 2004 10:22:35:307AM 1040212006 Joseph Snipes Shot 6: Repeat. Good shot.

Feb 12 2004 10:50:48:657AM 1040212007 Joseph Snipes Shot 7: Repeat. Good shot.

Feb 12 2004 10:51:06:763AM 1040212008 Joseph Snipes Shot 8: Repeat. Good shot.

Feb 12 2004 11:15:34:163AM 1040212009 Joseph Snipes Shot 9: Repeat. Dud! Sparker seems to be arcing wildly.

Feb 12 2004 11:19:46:453AM 1040212010 Joseph Snipes Shot 10: Repeat. Good shot.

Feb 12 2004 11:38:37:973AM 1040212011 Joseph Snipes Shot 11: Loaded shot 1040211015 in all segments. Good shot. Nice long EDA H-mode.

Feb 12 2004 11:48:15:083AM 1040212012 Joseph Snipes Shot 12: Repeat. Very similar good shot.

Feb 12 2004 12:00:32:847PM 1040212013 Joseph Snipes Shot 13: Reload shot 1040212010 from today. Good shot.

Feb 12 2004 12:14:15:647PM 1040212014 Joseph Snipes Shot 14: Repeat. Fizzle!

Feb 12 2004 12:27:12:643PM 1040212015 Joseph Snipes Shot 15: Increased Br0 by 0.3 mT to 0.8 mT. Decreased prepuff by 1 ms to 14 ms duration. Reduced nl04 to
7.5 x 10^19 m^-2. Fizzle!

Feb 12 2004 12:44:49:180PM 1040212016 Joseph Snipes Shot 16: Try increasing the prepuff to 17 ms duration. Good shot. Earlier breakdown.

Feb 12 2004 12:52:51:527PM 1040212017 Joseph Snipes Shot 17: Increased prepuff by another ms to 18 ms duration. Fizzle. Again a late breakdown.

Feb 12 2004 01:06:32:713PM 1040212018 Joseph Snipes Shot 18: Return to Br0 = 0.5 mT and 17 ms prepuff. Got plasma, but it disrupted at 0.783 s during the RF.

Feb 12 2004 01:19:13:227PM 1040212019 Joseph Snipes Shot 19: Repeat. Fizzle!

Feb 12 2004 01:32:24:410PM 1040212020 Joseph Snipes Shot 20: Reduced Br0 by another 0.2 mT to 0.3 mT. Got plasma but it disrupted at 0.986 sec.

Feb 12 2004 01:46:29:460PM 1040212021 Joseph Snipes Shot 21: Try reducing the prepuff to 14 ms duration to avoid a fizzle. Dud!

Feb 12 2004 01:58:14:187PM 1040212022 Joseph Snipes Shot 22: Return prepuff to 17 ms duration. Increase RXL by 2cm to 0.02 m from 0.35 to 1.5 s. Fizzle. Late
breakdown.

Feb 12 2004 02:14:27:013PM 1040212023 Joseph Snipes Shot 23: Reduced EF4 current by 10 A to -1345 A. Good shot. Breakdown at the usual time.

Feb 12 2004 02:28:35:143PM 1040212024 Joseph Snipes Shot 24: Reduced segment 1 pre-programmed gas puff from 100 V to 40 V. Reduced RXL by 1 cm to 0.01 m.
Good shot, but we lost the TCI density feedback so there were strong gas puffs during the H-mode.

Feb 12 2004 02:40:38:203PM 1040212025 Joseph Snipes Shot 25: Reduced RXL by another 2 mm to 0.008 m. Good shot.

Feb 12 2004 02:55:03:167PM 1040212026 Joseph Snipes Shot 26: Repeat. Good shot, though the RF tripped shortly after reaching 4 MW.

Feb 12 2004 03:08:33:537PM 1040212027 Joseph Snipes Shot 27: Raised pre-programmed gas puff in segment 1 to 100 V again and increased nl04 to 8.5 x 10^19 m^-2.
Late breakdown again with a fizzle.

Feb 12 2004 03:22:20:310PM 1040212028 Joseph Snipes Shot 28: Increased Br0 by 0.2 mT again back to 0.5 mT. Reduced EF4 current again to -1350 A. Good shot.
The RF tripped at high power again.

Feb 12 2004 03:44:41:497PM 1040212029 Joseph Snipes Shot 29: Repeat. Good shot. Late breakdown again.

Feb 12 2004 03:46:52:430PM 1040212030 Joseph Snipes Shot 30: Reduced prepuff to 15 ms duration. Good shot. Breakdown back to the normal time.

Feb 12 2004 04:00:06:783PM 1040212031 Joseph Snipes Shot 31: Reduced nl04 to 8 x 10^19 m^-2. Late breakdown and a fizzle!

Feb 12 2004 04:10:43:813PM 1040212031 Joseph Snipes Shot 31: Reduced nl04 to 8 x 10^19 m^-2. Late breakdown and a fizzle! Data system meltdown.

Feb 12 2004 04:38:12:380PM 1040212032 Joseph Snipes Shot 32: Try again. Increased prepuff to 17 ms duration. Good shot.

Feb 12 2004 04:49:06:880PM 1040212033 Joseph Snipes Shot 33: Moving to Wukitch's MP 380 on Sawteeth. Lowered ZXU to 0.02 from 0.05 m. Lowered TF current to 142 kA
from 150 kA to provide 5.2 T. Good shot. Multiple H-modes. SSEP only down to - 0.8 from -2.

Feb 12 2004 04:58:01:867PM 1040212034 Joseph Snipes Shot 34: Reduced ZXU to 0.5 cm to further reduce SSEP and get closer to double null. Fizzle!

Feb 12 2004 05:11:12:330PM 1040212034 Joseph Snipes Summary:

The run started out well for the first 8 shots, then there was a dud for unknown
reasons. Then, there were a numbers of fizzles and another dud during the rest of
the day. Nonetheless, the RF worked reasonably well in that several shots reached
up to 5 MW or so and near record neutron rates and stored energies were obtained.
A neutron alert was issued already on shot 10 so the machine was quite activated by
the end of the run. It was not clear what was responsible for all of the fizzles and
duds. I found Bz changing and adjusted EF4 down as low as -1350 A. There was also
a data system problem after shot 31 that delayed the run for about 15 minutes or so.
A few shots also had problems with the TCI and density feedback was lost on shot 24.
Despite the difficulties, it was a fairly good run for a post-boronization ICRF
conditioning run.

Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax
1 1.940 1.051 2 1.944 1.049
3 1.943 1.056 4 1.944 1.055
5 1.946 1.059 6 1.947 1.059
7 1.947 1.063 8 1.946 1.066
9 0.000 0.033 10 1.952 1.056
11 1.953 1.056 12 1.954 1.060
13 1.953 1.056 14 0.000 0.048
15 0.000 0.050 16 1.952 1.065
17 0.000 0.042 18 0.786 1.141
19 0.000 0.045 20 0.990 1.069
21 0.000 0.039 22 0.000 0.045
23 1.959 1.071 24 1.868 1.069
25 1.946 1.072 26 1.949 1.067
27 0.000 0.040 28 1.957 1.068
29 1.954 1.065 30 1.954 1.069
31 0.000 0.054 32 1.960 1.068
33 1.959 1.069 34 0.000 0.060

Finished summary for 1040212 Total of 34 shots.
34 shots. 24 plasmas. 8 fizzles. 2 duds.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:04:10:537AM Plasma Ok

2 09:20:25:447AM Plasma Ok

3 09:34:24:243AM Plasma Ok

4 09:51:44:607AM Plasma Ok

5 10:05:52:367AM Plasma Ok

6 10:19:45:983AM Plasma Ok

7 10:33:49:620AM Plasma Ok

8 10:49:15:767AM Plasma Ok

9 11:04:01:183AM Plasma Ok

10 11:17:24:240AM Plasma Ok

11 11:31:24:140AM Plasma Ok

12 11:45:09:340AM Plasma Ok

13 11:58:35:490AM Plasma Ok

14 12:11:55:277PM Plasma Ok

15 12:24:49:930PM Plasma Ok

16 12:37:23:830PM Plasma Ok

17 12:49:59:763PM Plasma Ok

18 01:03:25:403PM Plasma Ok

19 01:17:02:030PM Plasma Ok

20 01:29:34:087PM Plasma Ok

21 01:43:01:260PM Plasma Ok

22 01:56:03:583PM Plasma Ok

23 02:11:30:360PM Plasma Ok

24 02:23:56:557PM Plasma Ok

25 02:36:37:583PM Plasma Ok

26 02:49:40:563PM Plasma Ok

27 03:06:12:837PM Plasma Ok

28 03:18:56:957PM Plasma Ok

29 03:31:37:750PM Plasma Ok

30 03:44:26:683PM Plasma Ok

31 03:57:57:927PM Test Bad

32 04:28:12:337PM Plasma Ok

33 04:43:10:280PM Plasma Ok

34 04:55:51:277PM Plasma Ok

Session Leader Comments
Feb 13 2004 09:27:33:550AM		Yijun Lin	run summary: FMIT #4 crowbar cabinet and high yard breakers, etc, were repaired from the accident 1040109. More than 2 MW power were reliably delivered from J-antenna. We successfully preduced several shots with very high stored energy. Shot 23 and shot 30 are ranked as the 3rd and 4th in stored energy in all C-Mod shots. Only 4.3 MW rf was applied to get 227 kJ in shot 23. Some effect was tried to break the record Wmhd level, but unsuccessful due to unpredictable trips from either E or J antennas at high power. Total 7 shots with stored energy higher than 200 kJ were achieved in this run. H-factor at 1.7-2.1 is the norm late in the run. Previous shots with highest stored energy (980217015, Wmhd_max = 234 kJ, Prf = 3.5 MW 1001013002: Wmhd_max = 233 kJ, Prf = 5.1 MW) This run: 1040212023: Wmhd_max = 227 kJ, Prf = 4.3 MW 1040212030: Wmhd_max = 228 kJ, Prf = 5.1 MW ----------- The gas puff rate change seems not to preduce significantly better performance, but nonetheless, slightly better. Shot 13 and 10 at max gas puff rate had 128-130 kJ Wmhd, while shot 11 and 12 at usual gas puff rate had 118-133 kJ Wmhd at 2 MW power from D and E. (Note preboronization, the stored energy is at 110 kJ level). Several disruptions occurs at higher power due to injections. It is avoided after moving the outer striking point from divertor floor to the outer divertor plate. This change may also have reduced the impurity level at high power, and resulted better performance. Note Zeff in shot 1 was closed to 1, but it went up to 2 in only a couple of shots. Based on the experiments with Nitrogen puff in yesterday, such rapid increase of Zeff is likely caused by some unidentified high-Z impurity source. More detective work is still needed.
Feb 12 2004 02:10:25:820PM	1040212001	Yijun Lin	shot 1: Request: Load shot 1040211009 Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: Standard fiducial rf waveform. Step up to 4 MW. Max gas puff in segment 1. Result: Long EDA H-mode. (injection at 0.1 sec) Max Wmhd 116 kJ @ Prf ~ 2 MW Got power from J antenna! Zeff ~ 1.1 Next: same plasma, same rf waveform to recover antennas from boronization
Feb 12 2004 02:11:04:497PM	1040212002	Yijun Lin	shot 2: (post-boronization recovery) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: Standard fiducial rf waveform. Step up to 4 MW. Max gas puff in segment 1. Result: Long EDA H-mode. Plasma performance seemed to be the same as yesterday. Zave up to 1.6 Next: raise RF power.
Feb 12 2004 09:47:48:993AM	1040212003	Yijun Lin	shot 3:(post-boronization recovery) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: rf steps, 2.8 MW to 4.4 MW Max gas puff in segment 1. Result: Long EDA H-mode. Max Wmhd 131 kJ @ Prf ~ 3.3 MW Zave ~ 1.5 (lower than yesterday, which was about 2) Next shot: raise RF power.
Feb 12 2004 10:04:31:290AM	1040212004	Yijun Lin	shot 4:(post-boronization recovery) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: rf steps, 2.8 MW to 4.4 MW Max gas puff in segment 1. Result: Long EDA H-mode. Max Wmhd 175 kJ @ Prf ~ 5 MW Zeff ~ 1.8 Next shot: repeat.
Feb 12 2004 10:25:27:303AM	1040212005	Yijun Lin	shot 5:(post-boronization recovery) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: rf steps, 3 MW to 5 MW Max gas puff in segment 1. Result: Long EDA H-mode. Max Wmhd 178kJ @ Prf ~ 5. MW Zeff ~ 1.8 Next shot: repeat.
Feb 12 2004 10:33:40:323AM	1040212006	Yijun Lin	shot 6:(post-boronization recovery) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: rf steps, 3.6 MW to 5.8 MW Max gas puff in segment 1. Result: Long EDA H-mode. Max Wmhd 183kJ @ Prf ~ 5.1 MW Zeff ~ 1.6
Feb 12 2004 10:48:31:487AM	1040212007	Yijun Lin	shot 7:(post-boronization recovery) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: rf steps, 4 MW to 6 MW Max gas puff in segment 1. Result: Long EDA H-mode. Max Wmhd 190kJ @ Prf ~ 5. MW Zeff ~ 1.7
Feb 12 2004 11:00:12:953AM	1040212008	Yijun Lin	shot 8:(post-boronization recovery) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: rf steps, 4.5 MW to 6 MW Max gas puff in segment 1. Result: 2 H-modes Max Wmhd 160kJ. Many rf trips. Zeff ~ 1.8 An injection at about 1.05 sec caused H-L transition. (Zave to 2.3) 2nd injection at 1.2 sec may come from J-port.
Feb 12 2004 11:17:55:973AM	1040212009	Yijun Lin	shot 9:(post-boronization recovery) dud Next: start MP388 part 2.
Feb 12 2004 11:28:38:427AM	1040212010	Yijun Lin	shot 10: (start MP 388 part 2) (compare boronization effect.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 2 MW from D and E. (same as 1040211009) Max gas puff in segment 1. Result: 2 EDA H-modes Wmhd at 128 kJ. (Compared ~ 110 kJ pre-boronization). There was an injection at 0.1 sec. Next: load 1040211015, which has a smaller segment 1 gas puff.
Feb 12 2004 11:38:36:613AM	1040212011	Yijun Lin	shot 11: (MP 388 part 2) (compare boronization effect.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 2 MW from D and E. (same as 1040211015) Lower gas puff in segment 1. (rate 27 torr-liter/s) Result: Wmhd at 118 kJ. (Compared ~ 110 kJ pre-boronization). There was injections at 0.1 sec. Next: repeat to have one more data point.
Feb 12 2004 11:49:47:300AM	1040212012	Yijun Lin	shot 12: (MP 388 part 2) (boronization effect.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 2 MW from D and E. (same as 1040211015) low gas puff in segment 1. (rate 27 torr-liter/s) Result: Wmhd at 123 kJ. (Compared ~ 110 kJ pre-boronization). Next: repeat shot 10, which has a higher gas puff in segment 1.
Feb 12 2004 11:50:38:390AM	1040212012	Yijun Lin	shot 12: (MP 388 part 2) (boronization effect.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 2 MW from D and E. (same as 1040211015) low gas puff in segment 1. (rate 27 torr-liter/s) Result: Wmhd at 123 kJ. (Compared ~ 110 kJ pre-boronization). Next: repeat shot 10, which has a higher gas puff in segment 1.
Feb 12 2004 12:04:19:560PM	1040212013	Yijun Lin	shot 13: (MP 388 part 2) (boronization and gas puff effects.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 2 MW from D and E. (same as 1040211015) Max gas puff in segment 1. Result: Wmhd at 130 kJ. (Compared ~ 110 kJ pre-boronization and 123 kJ previous shot). Next: Raise rf power to 4 MW
Feb 12 2004 12:14:48:320PM	1040212014	Yijun Lin	fizzle
Feb 12 2004 12:27:41:050PM	1040212015	Yijun Lin	fizzle
Feb 12 2004 12:47:43:300PM	1040212016	Yijun Lin	shot 16:(MP 388 part 2) (boronization and gas puff effects.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 4.25 MW from D, E and J. Max gas puff in segment 1. Result: Wmhd at 185 kJ @ 4.2 MW. H factor 1.9 for two EFIT points. Next: repeat at higher power.
Feb 12 2004 12:53:57:190PM	1040212017	Yijun Lin	fizzle
Feb 12 2004 01:08:46:117PM	1040212018	Yijun Lin	shot 18:(MP 388 part 2) (boronization and gas puff effects.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 5 MW from D, E and J. Max gas puff in segment 1. Result: disrupted at 0.78 sec (injection). Next: repeat.
Feb 12 2004 01:19:52:027PM	1040212019	Yijun Lin	fizzle
Feb 12 2004 01:56:44:900PM	1040212020	Yijun Lin	shot 20: (MP 388 part 2) (boronization and gas puff effects.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 4.6 MW from D, E and J. Max gas puff in segment 1. Result: Wmhd at 218 kJ @ Prf 4.6 MW. Big injection ('shooting star' seen by WIDE2) caused disruption at 0.97 sec. H factor 1.7-2.0 before injection. Next: repeat.
Feb 12 2004 01:58:53:987PM	1040212021	Yijun Lin	dud. (presumably due to the disruption in the previous shot). Brian said that we'd better move the strike point to the outer divertor plate instead of the floor (to avoid hot spot on the floor, which may have been the source of injection at high rf power). Try this next shot.
Feb 12 2004 01:58:35:250PM	1040212022	Yijun Lin	fizzle
Feb 12 2004 02:18:59:500PM	1040212023	Yijun Lin	shot 23: (MP 388 part 2) (boronization and gas puff effects.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 4.6 MW from D, E and J. Max gas puff in segment 1. Result: Wmhd at 227 kJ @ Prf 4.3 MW. H factor > 2 for a while. Neutron rate > 1e14 Next: reduce segment 1 puff to 40. (usual level in 02 and 03) See whether we can still get this level.
Feb 12 2004 02:31:13:700PM	1040212024	Yijun Lin	shot 24: (MP 388 part 2) (boronization and gas puff effects.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 4.6 MW from D, E and J. Lowre gas puff rate in segment 1. Result: Wmhd at 206 kJ @ Prf 5 MW. density signal lost (bad feedback control). Next: repeat.
Feb 12 2004 02:46:03:460PM	1040212025	Yijun Lin	shot 25: (MP 388 part 2) (boronization and gas puff effects.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 4.6 MW from D, E and J. Lower gas puff rate in segment 1. Result: Wmhd at 190 kJ @ Prf 4.8 MW. Lost density control again. Next: repeat.
Feb 12 2004 03:09:19:300PM	1040212026	Yijun Lin	shot 26: (MP 388 part 2) (boronization and gas puff effects.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.75e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 4.6 MW from D, E and J. Low gas puff rate in segment 1. Result: Wmhd at 182 kJ @ Prf 3.5 MW. H factor at about 1.7. Performance seems to be insensentive to the gas puff. Next: Back to max puff rate in segment 1 and raise target density to 0.85e20. Also raise rf power a little. Can we break the record Stored energy level? 980217015, Wmhd_max = 234 kJ, Prf = 3.5 MW 1001013002: Wmhd_max = 233 kJ, Prf = 5.1 MW
Feb 12 2004 03:09:45:487PM	1040212027	Yijun Lin	fizzle
Feb 12 2004 03:28:18:100PM	1040212028	Yijun Lin	shot 28: (MP 388 part 2) (boronization and gas puff effects.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.85e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 5.0 MW from D, E and J. Max gas puff rate in segment 1. Result: Wmhd at 190 kJ @ Prf 4-5 MW (E port many trips). Wmhd at 157 kJ later with 3 MW from D + E. H factor at about 1.5-1.7. Next: repeat to have better RF.
Feb 12 2004 03:40:01:597PM	1040212029	Yijun Lin	shot 29: (MP 388 part 2) (boronization and gas puff effects.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.85e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 5.0 MW from D, E and J. Max gas puff rate in segment 1. Result: Wmhd at 220 kJ @ Prf 5.1 MW (J port many trips). Next: repeat. hopefully, better rf.
Feb 12 2004 03:54:32:230PM	1040212030	Yijun Lin	shot 30: (MP 388 part 2) (boronization and gas puff effects.) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.85e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 5.0 MW from D, E and J. Max gas puff rate in segment 1. Result: Wmhd at 228 kJ @ Prf 5.2 MW (E port tripped too early). Hfactor ~ 1.8,one long H-mode Next: repeat. Lower E port power. Raise J port power. And lower target density to 0.8e20 n^-2.
Feb 12 2004 04:00:02:550PM	1040212031	Yijun Lin	fizzle
Feb 12 2004 04:44:59:200PM	1040212032	Yijun Lin	shot 32: (delayed by a computer problem) (MP 388 part 2) (Trying to break the record of stored energy) Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.8e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: 5.0 MW from D, E and J. Max gas puff rate in segment 1. Result: Wmhd at 217 kJ @ Prf 3.6 to 5 MW (E port many trips). Hfactor ~ 1.8-2.0, one long H-mode Done on MP388. Next: SL: Wukitch on monster sawteeth in double null plasmas.

Physics Operator Comments
Feb 12 2004 08:30:34:280AM		Joseph Snipes	Session leader: Y. Lin - S. Wukitch Physics operator: J. A. Snipes Overnight boronization. No cell access after Wednesday's run until 7:00 am Thursday. Run begins at 09:00 and ends at 17:00. Power systems the same as 1040209001 A-coils as on 1040107004. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB Run plan: Start with shot 1040211009. Run MP 355 Boronization Recovery and ICRF Conditioning followed by the post-boronization part of MP 388. Note that we do NOT want to do the N2 puffing part of this MP in the post-boronization run. If there is in fact time remaining, the remainder of the run should be spent trying to get #3 and 4 back in operation. If this is successful, then we will start on either MP 380 (sawtooth effect) or MP 379 (high power ICRF).
Feb 12 2004 09:09:07:463AM	1040212001	Joseph Snipes	Shot 1: Copied entire shot 1040211009. Good shot.
Feb 12 2004 09:33:11:180AM	1040212002	Joseph Snipes	Shot 2: Raised Ip at 0.1 s in Segment 2 to 0.6 MA to match the actual current ramp and avoid the current dip just after the segment switch. Good shot. Current rise is much better.
Feb 12 2004 09:56:55:287AM	1040212003	Joseph Snipes	Shot 3: Repeat. Good shot.
Feb 12 2004 09:58:13:203AM	1040212004	Joseph Snipes	Shot 4: Repeat. Good shot, though there was a problem with the data from the bus rogowskis.
Feb 12 2004 10:08:05:470AM	1040212005	Joseph Snipes	Shot 5: Repeat. Good shot.
Feb 12 2004 10:22:35:307AM	1040212006	Joseph Snipes	Shot 6: Repeat. Good shot.
Feb 12 2004 10:50:48:657AM	1040212007	Joseph Snipes	Shot 7: Repeat. Good shot.
Feb 12 2004 10:51:06:763AM	1040212008	Joseph Snipes	Shot 8: Repeat. Good shot.
Feb 12 2004 11:15:34:163AM	1040212009	Joseph Snipes	Shot 9: Repeat. Dud! Sparker seems to be arcing wildly.
Feb 12 2004 11:19:46:453AM	1040212010	Joseph Snipes	Shot 10: Repeat. Good shot.
Feb 12 2004 11:38:37:973AM	1040212011	Joseph Snipes	Shot 11: Loaded shot 1040211015 in all segments. Good shot. Nice long EDA H-mode.
Feb 12 2004 11:48:15:083AM	1040212012	Joseph Snipes	Shot 12: Repeat. Very similar good shot.
Feb 12 2004 12:00:32:847PM	1040212013	Joseph Snipes	Shot 13: Reload shot 1040212010 from today. Good shot.
Feb 12 2004 12:14:15:647PM	1040212014	Joseph Snipes	Shot 14: Repeat. Fizzle!
Feb 12 2004 12:27:12:643PM	1040212015	Joseph Snipes	Shot 15: Increased Br0 by 0.3 mT to 0.8 mT. Decreased prepuff by 1 ms to 14 ms duration. Reduced nl04 to 7.5 x 10^19 m^-2. Fizzle!
Feb 12 2004 12:44:49:180PM	1040212016	Joseph Snipes	Shot 16: Try increasing the prepuff to 17 ms duration. Good shot. Earlier breakdown.
Feb 12 2004 12:52:51:527PM	1040212017	Joseph Snipes	Shot 17: Increased prepuff by another ms to 18 ms duration. Fizzle. Again a late breakdown.
Feb 12 2004 01:06:32:713PM	1040212018	Joseph Snipes	Shot 18: Return to Br0 = 0.5 mT and 17 ms prepuff. Got plasma, but it disrupted at 0.783 s during the RF.
Feb 12 2004 01:19:13:227PM	1040212019	Joseph Snipes	Shot 19: Repeat. Fizzle!
Feb 12 2004 01:32:24:410PM	1040212020	Joseph Snipes	Shot 20: Reduced Br0 by another 0.2 mT to 0.3 mT. Got plasma but it disrupted at 0.986 sec.
Feb 12 2004 01:46:29:460PM	1040212021	Joseph Snipes	Shot 21: Try reducing the prepuff to 14 ms duration to avoid a fizzle. Dud!
Feb 12 2004 01:58:14:187PM	1040212022	Joseph Snipes	Shot 22: Return prepuff to 17 ms duration. Increase RXL by 2cm to 0.02 m from 0.35 to 1.5 s. Fizzle. Late breakdown.
Feb 12 2004 02:14:27:013PM	1040212023	Joseph Snipes	Shot 23: Reduced EF4 current by 10 A to -1345 A. Good shot. Breakdown at the usual time.
Feb 12 2004 02:28:35:143PM	1040212024	Joseph Snipes	Shot 24: Reduced segment 1 pre-programmed gas puff from 100 V to 40 V. Reduced RXL by 1 cm to 0.01 m. Good shot, but we lost the TCI density feedback so there were strong gas puffs during the H-mode.
Feb 12 2004 02:40:38:203PM	1040212025	Joseph Snipes	Shot 25: Reduced RXL by another 2 mm to 0.008 m. Good shot.
Feb 12 2004 02:55:03:167PM	1040212026	Joseph Snipes	Shot 26: Repeat. Good shot, though the RF tripped shortly after reaching 4 MW.
Feb 12 2004 03:08:33:537PM	1040212027	Joseph Snipes	Shot 27: Raised pre-programmed gas puff in segment 1 to 100 V again and increased nl04 to 8.5 x 10^19 m^-2. Late breakdown again with a fizzle.
Feb 12 2004 03:22:20:310PM	1040212028	Joseph Snipes	Shot 28: Increased Br0 by 0.2 mT again back to 0.5 mT. Reduced EF4 current again to -1350 A. Good shot. The RF tripped at high power again.
Feb 12 2004 03:44:41:497PM	1040212029	Joseph Snipes	Shot 29: Repeat. Good shot. Late breakdown again.
Feb 12 2004 03:46:52:430PM	1040212030	Joseph Snipes	Shot 30: Reduced prepuff to 15 ms duration. Good shot. Breakdown back to the normal time.
Feb 12 2004 04:00:06:783PM	1040212031	Joseph Snipes	Shot 31: Reduced nl04 to 8 x 10^19 m^-2. Late breakdown and a fizzle!
Feb 12 2004 04:10:43:813PM	1040212031	Joseph Snipes	Shot 31: Reduced nl04 to 8 x 10^19 m^-2. Late breakdown and a fizzle! Data system meltdown.
Feb 12 2004 04:38:12:380PM	1040212032	Joseph Snipes	Shot 32: Try again. Increased prepuff to 17 ms duration. Good shot.
Feb 12 2004 04:49:06:880PM	1040212033	Joseph Snipes	Shot 33: Moving to Wukitch's MP 380 on Sawteeth. Lowered ZXU to 0.02 from 0.05 m. Lowered TF current to 142 kA from 150 kA to provide 5.2 T. Good shot. Multiple H-modes. SSEP only down to - 0.8 from -2.
Feb 12 2004 04:58:01:867PM	1040212034	Joseph Snipes	Shot 34: Reduced ZXU to 0.5 cm to further reduce SSEP and get closer to double null. Fizzle!
Feb 12 2004 05:11:12:330PM	1040212034	Joseph Snipes	Summary: The run started out well for the first 8 shots, then there was a dud for unknown reasons. Then, there were a numbers of fizzles and another dud during the rest of the day. Nonetheless, the RF worked reasonably well in that several shots reached up to 5 MW or so and near record neutron rates and stored energies were obtained. A neutron alert was issued already on shot 10 so the machine was quite activated by the end of the run. It was not clear what was responsible for all of the fizzles and duds. I found Bz changing and adjusted EF4 down as low as -1350 A. There was also a data system problem after shot 31 that delayed the run for about 15 minutes or so. A few shots also had problems with the TCI and density feedback was lost on shot 24. Despite the difficulties, it was a fairly good run for a post-boronization ICRF conditioning run. Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax 1 1.940 1.051 2 1.944 1.049 3 1.943 1.056 4 1.944 1.055 5 1.946 1.059 6 1.947 1.059 7 1.947 1.063 8 1.946 1.066 9 0.000 0.033 10 1.952 1.056 11 1.953 1.056 12 1.954 1.060 13 1.953 1.056 14 0.000 0.048 15 0.000 0.050 16 1.952 1.065 17 0.000 0.042 18 0.786 1.141 19 0.000 0.045 20 0.990 1.069 21 0.000 0.039 22 0.000 0.045 23 1.959 1.071 24 1.868 1.069 25 1.946 1.072 26 1.949 1.067 27 0.000 0.040 28 1.957 1.068 29 1.954 1.065 30 1.954 1.069 31 0.000 0.054 32 1.960 1.068 33 1.959 1.069 34 0.000 0.060 Finished summary for 1040212 Total of 34 shots. 34 shots. 24 plasmas. 8 fizzles. 2 duds.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:04:10:537AM	Plasma	Ok
2	09:20:25:447AM	Plasma	Ok
3	09:34:24:243AM	Plasma	Ok
4	09:51:44:607AM	Plasma	Ok
5	10:05:52:367AM	Plasma	Ok
6	10:19:45:983AM	Plasma	Ok
7	10:33:49:620AM	Plasma	Ok
8	10:49:15:767AM	Plasma	Ok
9	11:04:01:183AM	Plasma	Ok
10	11:17:24:240AM	Plasma	Ok
11	11:31:24:140AM	Plasma	Ok
12	11:45:09:340AM	Plasma	Ok
13	11:58:35:490AM	Plasma	Ok
14	12:11:55:277PM	Plasma	Ok
15	12:24:49:930PM	Plasma	Ok
16	12:37:23:830PM	Plasma	Ok
17	12:49:59:763PM	Plasma	Ok
18	01:03:25:403PM	Plasma	Ok
19	01:17:02:030PM	Plasma	Ok
20	01:29:34:087PM	Plasma	Ok
21	01:43:01:260PM	Plasma	Ok
22	01:56:03:583PM	Plasma	Ok
23	02:11:30:360PM	Plasma	Ok
24	02:23:56:557PM	Plasma	Ok
25	02:36:37:583PM	Plasma	Ok
26	02:49:40:563PM	Plasma	Ok
27	03:06:12:837PM	Plasma	Ok
28	03:18:56:957PM	Plasma	Ok
29	03:31:37:750PM	Plasma	Ok
30	03:44:26:683PM	Plasma	Ok
31	03:57:57:927PM	Test	Bad
32	04:28:12:337PM	Plasma	Ok
33	04:43:10:280PM	Plasma	Ok
34	04:55:51:277PM	Plasma	Ok