Alcator C-Mod Run 1091216 Information

Miniproposals

Miniproposal: 296

Date Filed: 5/14/2001

Title: Confirmation of Thomson scattering density calibration using electron cyclotron emission cutoffs

First Author: Jerry Hughes

Session Leader: Yunxing Ma (shots 32-36)

Miniproposal: 571

Date Filed: 8/21/2009

Title: Further Investigation of Turbulence and Transport in Low Density Ohmic Plasmas to Resolve the Myster

First Author: Liang Lin

Session Leader: Miklos Porkolab (shots 1-36)

Operators
Session leader(s):	Miklos Porkolab,Yunxing Ma
Physics operator(s):	Robert Granetz
Engineering operator(s):	Bill Parkin,Sam Pierson,Ed Fitzgerald

Engineering Operator Run Comment
MP#580 Comparison of Type I ELM...

Session Leader Plans

Entered: Dec 16 2009 09:20:06:090AM

Author: Miklos Porkolab

2nd day of transport and turbulence studies with Ohmic run in the neo-Alcator (low density) regime (continue from 12/15/09).

1. Start with 3.9 T, Ip = 0.6 MA, nl04 = 0.2E20.
2. Repeat shot as needed to get a good shot.
3. Bt= 3.9 T, Ip = 0.6 MA, nl04 = 0.25E20.
4. Repeat 3.
5. Bt = 3.9 T, Ip = 0.6 MA, nl04= 0.30E20.
6. Repeat 5.
7. Bt = 3.9, Ip = 0.6 MA, nl04 = 0.4E20.
8. Repeat 7
9. Bt = 3.9, Ip = 0.6, nl04 = 0.5E20.
10 Bt= 3.9, Ip = 0.6, nl04 = 0.6E20.
11.Change Bt = 2.6, Ip = 0.4 MA, nl04 = 0.4E20.
12. Repeat 11.
13. Bt = 2.6 T, Ip = 0.4 MA, nl04 = 0.5E20.
14. Bt = 2.6, Ip = 0.4, nl04 = 0.6E20.

Key diagnostics include PCI, Thomson, neutrons and HIREX Senior.
Piggyback experiments include laser blow-off of CaF2 (at 1.30 sec into shot) and GPI, starting at 1.40 sec. If laser blow-off stops, bring GPI to 1.30 sec.

If finish early, Jerry Hughes and Amanda want to do density calibration of Thomson.

Entered: Dec 16 2009 02:07:20:370PM

Author: Yunxing Ma

The second half of today's run (starting 3PM) will switch from MP571 to MP296 to cross calibrate TS density with ECE cutoffs. We start from loading the following parameters:

using the discharge from the first part of the run, but with Ip raised to 700kA.

nl04 as shot 1080311022, target nl04 from 1e20 and raise to 2e20 at the end of the shot.
Bt at 3.9T
Ip at 700KA
q95~3.2
No cryopump is required.

This configuration will be kept when we see first satisfactory ECE cutoff signals. Subsequent shots will optimize density ramp, field, and current as needed to obtain useful cutoff data. At least 3~4 successful shot are required to be statistically meaningful.

In case the target configuration can not generate useful ECE cutoffs, we may switch to the backup plan:

Bt at 3.9T
Ip at 800KA
q95~2.8
nl04 loaded as shot 1080311022, or can be programmed a little higher.

This backup plan is a little risky with q95 slightly below 3.0

Physics Operators Plans

Entered: Dec 16 2009 08:58:20:043AM

Author: Robert Granetz

Load last shot from yesterday (1091215036), but change Bt to 3.9 T (108 kA), nl_04 to 0.2e20 m-2, and Ip to 0.6 MA. Cryopump is ready to go on the first shot.

Session Leader Summaries

Entered: Dec 28 2009 01:01:34:987PM

Author: Yunxing Ma

shot list: 1091218031~1091218036
shot 32~36 are successful shots.
shot 31 is a dud, shot 35 with GPC gate valve closed, otherwise the rest shots
are successful.

Plasma condition:

Ohmic
Cryo-pump off
Bt=3.9T
Ip=800KA
nl04 ramp from 1.0e20 at 0.6s to 2e1.8e20 at the end of each discharge.

Clear GPC cutoffs achieved for ch1~7, with minor radial-location adjustment between shots to optimize the coverage. GPC channel 7 fell close to the farthest edge core TS channel (ch 13) and overlap with some ETS channels. Data is being analyzed.

Entered: Dec 28 2009 03:09:00:567PM

Author: Yunxing Ma

Results of TS density correcting factors from analyzing ECE cutoff shots 1091216032~36 are posted below:

1091216032:
Fudge factors--
Core TS 1: 1.00 +/- 0.11
Core TS 2: 1.00 +/- 2.00
Core TS 3: 0.87 +/- 0.10
Core TS 4: 0.93 +/- 0.12
Core TS 5: 1.00 +/- 2.00
Core TS 6: 0.99 +/- 0.12
Core TS 7: 1.00 +/- 2.00
Core TS 8: 0.95 +/- 0.12
Core TS 9: 0.97 +/- 0.11
Core TS 10: 0.89 +/- 0.11
Core TS 11: 0.91 +/- 0.10
Core TS 12: 1.00 +/- 2.00
Core TS 13: 1.00 +/- 2.00
Core TS 14: 0.94 +/- 0.11
Core TS 15: 0.96 +/- 0.11
Edge TS : 1.00 +/- 2.00
Core TS 1: 1.19 +/- 0.15
Core TS 2: 1.00 +/- 2.00
Core TS 3: 0.95 +/- 0.11
Core TS 4: 0.97 +/- 0.11
Core TS 5: 1.00 +/- 2.00
Core TS 6: 1.03 +/- 0.13
Core TS 7: 1.00 +/- 2.00
Core TS 8: 1.01 +/- 0.13
Core TS 9: 1.02 +/- 0.11
Core TS 10: 1.01 +/- 0.12
Core TS 11: 0.95 +/- 0.11
Core TS 12: 1.00 +/- 2.00
Core TS 13: 1.00 +/- 2.00
Core TS 14: 1.05 +/- 0.13
Core TS 15: 1.06 +/- 0.12
Edge TS : 1.00 +/- 2.00

1091216033:

Fudge factors--
Core TS 1: 1.15 +/- 0.14
Core TS 2: 1.00 +/- 2.00
Core TS 3: 0.86 +/- 0.10
Core TS 4: 0.91 +/- 0.12
Core TS 5: 1.00 +/- 2.00
Core TS 6: 0.98 +/- 0.11
Core TS 7: 1.00 +/- 2.00
Core TS 8: 0.99 +/- 0.12
Core TS 9: 0.98 +/- 0.11
Core TS 10: 1.00 +/- 2.00
Core TS 11: 0.91 +/- 0.10
Core TS 12: 1.00 +/- 2.00
Core TS 13: 0.84 +/- 0.10
Core TS 14: 1.00 +/- 2.00
Core TS 15: 0.88 +/- 0.10
Edge TS : 1.00 +/- 2.00
Core TS 1: 1.19 +/- 0.21
Core TS 2: 1.00 +/- 2.00
Core TS 3: 0.92 +/- 0.10
Core TS 4: 0.98 +/- 0.11
Core TS 5: 1.00 +/- 2.00
Core TS 6: 1.03 +/- 0.13
Core TS 7: 1.00 +/- 2.00
Core TS 8: 1.03 +/- 0.13
Core TS 9: 1.02 +/- 0.11
Core TS 10: 1.01 +/- 0.12
Core TS 11: 0.96 +/- 0.11
Core TS 12: 1.00 +/- 2.00
Core TS 13: 0.87 +/- 0.11
Core TS 14: 1.00 +/- 2.00
Core TS 15: 0.92 +/- 0.10

1091216035:
Fudge factors--
Core TS 1: 1.08 +/- 0.12
Core TS 2: 1.00 +/- 2.00
Core TS 3: 0.86 +/- 0.10
Core TS 4: 0.92 +/- 0.12
Core TS 5: 1.00 +/- 0.12
Core TS 6: 0.96 +/- 0.12
Core TS 7: 1.00 +/- 2.00
Core TS 8: 0.96 +/- 0.12
Core TS 9: 0.97 +/- 0.12
Core TS 10: 0.93 +/- 0.11
Core TS 11: 0.91 +/- 0.10
Core TS 12: 0.97 +/- 0.13
Core TS 13: 0.84 +/- 0.10
Core TS 14: 0.87 +/- 0.10
Core TS 15: 1.00 +/- 2.00
Edge TS : 1.00 +/- 2.00
Core TS 1: 1.23 +/- 0.31
Core TS 2: 1.00 +/- 2.00
Core TS 3: 0.94 +/- 0.11
Core TS 4: 1.00 +/- 0.12
Core TS 5: 1.04 +/- 0.12
Core TS 6: 1.02 +/- 0.13
Core TS 7: 1.00 +/- 2.00
Core TS 8: 1.03 +/- 0.13
Core TS 9: 1.00 +/- 0.12
Core TS 10: 1.04 +/- 0.12
Core TS 11: 0.96 +/- 0.11
Core TS 12: 1.07 +/- 0.13
Core TS 13: 0.86 +/- 0.10
Core TS 14: 0.95 +/- 0.11
Core TS 15: 1.00 +/- 2.00
Edge TS : 1.00 +/- 2.00

1091216036:
Fudge factors--
Core TS 1: 1.02 +/- 0.12
Core TS 2: 0.82 +/- 0.09
Core TS 3: 0.84 +/- 0.10
Core TS 4: 0.90 +/- 0.11
Core TS 5: 1.00 +/- 2.00
Core TS 6: 0.99 +/- 0.12
Core TS 7: 1.02 +/- 0.12
Core TS 8: 0.98 +/- 0.12
Core TS 9: 1.00 +/- 0.11
Core TS 10: 1.00 +/- 2.00
Core TS 11: 0.92 +/- 0.11
Core TS 12: 0.98 +/- 0.13
Core TS 13: 1.00 +/- 2.00
Core TS 14: 0.94 +/- 0.11
Core TS 15: 0.90 +/- 0.10
Edge TS : 1.00 +/- 2.00
Core TS 1: 0.92 +/- 0.17
Core TS 2: 0.94 +/- 0.11
Core TS 3: 0.91 +/- 0.11
Core TS 4: 0.94 +/- 0.11
Core TS 5: 1.00 +/- 2.00
Core TS 6: 1.04 +/- 0.13
Core TS 7: 1.08 +/- 0.13
Core TS 8: 1.05 +/- 0.14
Core TS 9: 1.02 +/- 0.12
Core TS 10: 1.00 +/- 2.00
Core TS 11: 0.94 +/- 0.11
Core TS 12: 1.09 +/- 0.13
Core TS 13: 1.00 +/- 2.00
Core TS 14: 1.00 +/- 0.12
Core TS 15: 0.99 +/- 0.11
Edge TS : 1.00 +/- 2.00

Entered: Dec 28 2009 04:47:25:020PM

Author: Yunxing Ma

corrections to TS density:

YAG1&YAG2:
Ch11: x0.87
ch10: x0.95
Ch7: x0.90

then, YAG2 all x1.10 (alignment correction)

Entered: Dec 28 2009 04:53:50:893PM

Author: Yunxing Ma

corrections to TS density:

YAG1&YAG2:
Ch11: x0.87
ch10: x0.95
Ch7: x0.90

then, YAG2 all x1.05 (alignment correction)

Entered: Dec 28 2009 04:55:07:707PM

Author: Yunxing Ma

corrections to TS density:

YAG1&YAG2:
Ch11: x0.87
ch10: x0.95
Ch7: x0.90

then, YAG2 all x1.05 (alignment correction)

IDL> print,abs_calib/abs_old
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
0.900000 0.945000
1.00000 1.05000
1.00000 1.05000
0.950000 0.997500
0.870000 0.913500
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
IDL> mdsput,'calib:abs_calib','$',abs_calib
% Compiled module: MDSPUT.

Entered: Dec 28 2009 05:56:20:753PM

Author: Yunxing Ma

corrections to TS density:

YAG1&YAG2:
Ch11: x0.93
Ch7: x0.90

then, YAG2 all x1.05 (alignment correction)

IDL> print,abs_calib/abs_old
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
0.900000 0.945000
1.00000 1.05000
1.00000 1.05000
1.00000 1.00000
0.930000 0.976500
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
1.00000 1.05000
IDL> mdsput,'calib:abs_calib','$',abs_calib
% Compiled module: MDSPUT.

Physics Operator Summaries

Entered: Dec 16 2009 05:38:11:187PM

Author: Robert Granetz

Run summary for Wednesday 2009/12/16 09:00-15:30 MP571 - Turbulence & transport in low-density ohmic plasmas 15:30-16:50 MP296 - TS/ECE cross-calibration using density cutoff 16:50-17:00 MP590 - Characterization of driven TAE modes Session leaders: M. Porkolab Y. Ma, J. Hughes T. Golfinopoulos Physics operator: R. Granetz It was busy day because we wanted to finish up the low-density ohmic turbulence run that started the previous day, and we also wanted to cross-calibrate the TS using the ECE density cutoff, and then we wanted to start tomorrow's active MHD run. We actually achieved just about everything that was needed for the low-density ohmic run (scanned nl_04 from 0.2 to 0.6e20 m-2 at Bt=3.9, 2.6, and 5.2 T and Ip=0.4, 0.6, and 1.0 MA using Ian's low-field startup). We also completed the TS/ECE cross-calibration using a high density ramp. And we got off one shot at the end of the day to confirm that the active MHD antenna system was indeed working (at 850 kHz), although no resonances were seen with the Bt ramp. The machine ran well, and the problem with huge hard x-ray signals at the very low densities was apparently solved by increasing IC_EF4 by a total of 10 kA (5 kA added on shot 12 and again on shot 15). Startup with the cryopump worked reasonably reliably. The entire day was ohmic. Scorecard: 33 plasmas 2 duds (one due to no TF) 1 fizzle 0 power supply tests 1 no-power MDS shot cycle -------------- Total: 37 shot cycles

Session Leader Comments

Dec 16 2009 09:42:28:963AM 1091216003 Miklos Porkolab Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.2E20
Shot disrupted around 0.6 sec.

Dec 16 2009 09:51:02:463AM 1091216004 Miklos Porkolab Repeat shot 3.
Another injection at 0.45 sec, disrupting shot.

Dec 16 2009 10:12:51:810AM 1091216005 Miklos Porkolab Good shot. Assume finished run plan step 2.
Bt= 3.9T, Ip = 0.6 MA, nl04 = 0.20.
Moving on to higher density the next shot.
No Thomson, laser did not fire. Will come back to this density later.

Dec 16 2009 10:20:43:637AM 1091216006 Miklos Porkolab Good shot at Bt = 3.9 T, Ip = 0.6 MA,nl04= 0.25.
(run plan step 3). Some hard x rays.
Will repeat this shot. Thomson fired on this shot.
Then will come back to repeat nl04 = 0.20E20.

Dec 16 2009 10:30:49:027AM 1091216007 Miklos Porkolab Very short shot, early disruption at 0.1 sec.

Dec 16 2009 10:44:00:573AM 1091216008 Miklos Porkolab Another short pulse, disrupted early.
Will increase the fill pressure.

Dec 16 2009 11:12:55:980AM 1091216009 Miklos Porkolab Excellent shot.
Bt= 3.9 T, Ip = 0.6 MA, nl04 = 0.25.
Will go down in density to nl04 = 0.20 or next shot.

Dec 16 2009 11:18:15:527AM 1091216010 Miklos Porkolab Good shot, but the density is a little high early on.
Bt= 3.9 T, Ip = 0.6 MA.
Good for another data point at nl04 = 0.25E20.
The density came down to nl04 = 0.2 only after 1.0 sec.
So lets repeat shot and lower fill pressure early on.

Dec 16 2009 11:23:53:573AM 1091216011 Miklos Porkolab Good shot, density at 0.20E20 from 0.8 -1.5 sec.
Bt = 3.9 T, Ip = 0.6 MA. Hard X rays steady.
All diagnostic working.
Lets repeat this same shot for statistics then increase density.

Dec 16 2009 11:39:14:417AM 1091216012 Miklos Porkolab Excellent shot, it was a repeat for nl04 = 0.2 from 0.8-1.5 sec.
Bt = 3.9 T, Ip = 0.6 MA. So this was shot 2 on the shot sequence.
All diagnostics fired.
We will now increase the density on the next shot, up to nl04 = 0.3E20, same field and current.

Dec 16 2009 11:54:00:730AM 1091216013 Miklos Porkolab This will be shot 5 on the original shot plan.
Aim for Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.3E20.
Result: there was no TF field on this shot for some reason.
Will repeat the shot.

Dec 16 2009 12:01:18:310PM 1091216014 Miklos Porkolab Good shot, got the density we wanted, nl04 = 0.3E20.
Bt= 3.9 T, Ip = 0.6 MA. So completed 5 of the proposed shot sequence.
We will repeat the shot next for 6 of the sequence.

Dec 16 2009 12:23:42:277PM 1091216015 Miklos Porkolab Good shot, #6 in the sequence completed.
Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.3E20.
Almost no hard x rays on this shot.
Moving on to # 7 in the shot sequence next shot.

Dec 16 2009 12:27:12:340PM 1091216016 Miklos Porkolab Good shot, # 7 in the sequence.
Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.4E20.
Good thermal shot, almost no runaways.
Will repeat next shot (#8 in sequence).

Dec 16 2009 12:42:30:090PM 1091216017 Miklos Porkolab Good repeat shot at a density of nl04 = 0.40.
Bt = 3.9 T, Ip = 0.6 MA. Good thermal shot.
Completed # 8 in the shot sequence.
Moving on to # 9 in the next shot.

Dec 16 2009 12:54:42:540PM 1091216018 Miklos Porkolab Aiming for #9 in the sequence.
Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.5.
Good shot, but couple of little bumps on the density at t= 0.6 sec and 1.2 sec.
Lets repeat the shot.

Dec 16 2009 01:09:18:060PM 1091216019 Miklos Porkolab Good thermal shot. No hard X rays.
Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.5E20.
Good repeat shot of planned sequence # 9.
Moving on to #10, with target density of 0.6.

Dec 16 2009 01:20:55:197PM 1091216020 Miklos Porkolab Target shot sequence # 10.
Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.6E20.
Shot is excellent, right on the money !
With this, we have completed the 3.9 T sequence.
Next shot will be # 11 in the proposed sequence at 2.6 T.

Dec 16 2009 01:33:51:950PM 1091216021 Miklos Porkolab Shot # 11 in the sequence for the day.
Bt = 2.6 T, Ip = 0.4 MA, target density nl04 = 0.4.
OK, there was a little glitch in the density at 0.9 sec (cross-over) and the Bt field was a little high (2.7 T).
So will repeat the shot and lower the Bt field.

Dec 16 2009 01:43:07:107PM 1091216022 Miklos Porkolab Repeat of shot sequence #11, called #12 in the runplan.
Bt = 0.26 T, Ip = 0.4 MA, nl04 = 0.4E20.
Fizzle.Need to repeat.

Dec 16 2009 01:59:29:777PM 1091216023 Miklos Porkolab Bt = 2.60 T, Ip = 0.4 MA, nl04 = 0.4E20 ;
Density good and steady between 1.0 - 1.5 second.
(the density glitch at 0.9 sec is due to crossover.)
Moving on the shot sequence # 13, with target density 0.5E20.
Bt and Ip remain the same.

Dec 16 2009 02:13:44:120PM 1091216024 Miklos Porkolab Shot sequence # 13 in the plans.
Bt = 2.6 T, Ip = 0.4 MA, nl04 = 0.5E20.
Disrupted at 0.5 sec due to random injection.

Dec 16 2009 02:26:56:997PM 1091216025 Miklos Porkolab Repeat attempt to get shot #13. Bt = 2.6 T, Ip = 0.4 MA, nl04 = 0.5E20.
Density is somewhat variable near 1 sec.
Plasma is hitting the wall.
Proposal is to move density away 2 mm from the wall to see if we can get a
steady density around 1.0 sec.
Repeat shot otherwise. Still target # 13.

Dec 16 2009 02:41:26:747PM 1091216026 Miklos Porkolab Shot sequence # 13 repeated, with same parameters as previous shot 25.
(Bt = 2.6 T, Ip = 0.4 MA, nl04 = 0.5E20).
Nothing has changed from previous shot in spite of changing
the inner wall gap.
So we will declare this a success and move on to the next higher density, 0.6E20
at 2.6T (shot sequence #14).

Dec 16 2009 02:52:02:573PM 1091216027 Miklos Porkolab Shot sequence #14 in the plan.
Bt = 2.6 T, Ip = 0.4 MA, nl04 = 0.6.
Yes, excellent shot, density right on, shot sequence at 2.6 T complete.
Moving back to 5.2 T, 1 MA, for a few repeat shot from yesterday.
Aim for nl04 = 0.3

Dec 16 2009 03:12:37:370PM 1091216028 Miklos Porkolab Repeat from Dec 15th, Bt = 5.2 T, Ip = 1.0 MA,
aim for nl04 = 0.3. However, wall was fueling and density ended up at
nl04 = 0.6 - 0.7. Thermal shot.
Will need to repeat to see if density drops.

Dec 16 2009 03:14:51:540PM 1091216029 Miklos Porkolab Try once more at 5.2 T.
Ip = 1.0 MA.
nl04 = 0.55 . Slighlty less than before.
Try one more shot .

Dec 16 2009 03:41:38:963PM 1091216031 Yunxing Ma no plasma shot

Dec 16 2009 04:03:15:683PM 1091216032 Yunxing Ma good shot. plasma lasted full length

Dec 16 2009 04:05:13:667PM 1091216032 Yunxing Ma ECE cutoffs. density ramp a littler earlier. Delay the starting time of density ramp up next shot

Dec 16 2009 09:41:36:513PM 1091216037 Theodore Golfinopoulos Shot Summary:
Goal:
*****
Wide sweep of B_T to try to move AE resonant frequency across constant antenna drive frequency of 850 kHz. Also, preview of run tomorrow.

Result:
*******
Bt: 5.4-6.2T
Ip: 0.6 MA
Nl04: 0.7E20
Picrf: 0 MW

Plasma. Active MHD equipment functioning as expected.

Cannot see clear resonance; note spectrogram of some probes shows some response between 600 kHz and 800 kHz which is most likely an artifact of the probes' own resonance. Indeed, BP_EF_BOT and BP_BC_BOT do not show any activity in this region, and these probes have higher-frequency resonances.

Tried to load settings from 1080403010, but didn't have time to use same equilibrium or set up RF. AMHD antenna current 10 A flat - okay. RFENABLE was on from 0 to 2 s - should only be on from 0.5-1.5 s - this explains funky slow step-wise modulation in antenna current outside 0.5-1.5 s.

FTAE calculation in DPCS is funny - reports -690 kHz. Fix.

Next Shot:
**********
Load equilibrium from 1080403010 and try again a broad B_T sweep. (Now, RF on at Picrf=2 MW.) Keep active MHD antenna drive frequency at 850 kHz for now. RFENABLE on only from 0.5-1.5 s.

Physics Operator Comments

Dec 16 2009 10:25:01:497AM 1091216001 Robert Granetz
Shot 01 -- No-power cycle due to INIT failure on OH2 modules. Next shot: try again

Dec 16 2009 10:25:36:700AM 1091216001 Robert Granetz
INIT failed on shot 1. OH2 decoder failed to init.

Dec 16 2009 10:28:07:543AM 1091216002 Robert Granetz
Shot 02 -- Plasma, full length, but ratty startup. 0.6 MA, 3.97 T, 0.15-0.2e20 m-2, LSN, ohmic, cryopump on. Huge hard x-ray signal, as expected. OH2U coax resistance warning of 3 uohm. Next shot: increase pre-fill pulse by 4 ms, reduce Itor to 106 kA.

Dec 16 2009 10:20:04:933AM 1091216003 Robert Granetz
Shot 03 -- Plasma, disrupted at t=0.63 s. I think it was a locked mode right from the beginning. 0.6 MA, 3.9 T, 0.2e20 m-2, LSN, ohmic, cryopump. Nice startup. Next shot: program nl_04 to start at 0.4e20 m-2 and then come down to 0.2e20 m-2 at around t=0.35 s, which will hopefully prevent early mode locking; also start integrator for B21_PROJ wire at t=0.1 s (was t=0.2 s)

Dec 16 2009 10:17:58:637AM 1091216004 Robert Granetz
Shot 04 -- Plasma, but disrupted at t=0.45 s. This one was sawtoothing, so we solved the locked mode problem. I think it was an injection at t=0.44 s. 0.6 MA, 3.9 T, nl_04 was coming down to 0.2e20 m-2. Next shot: repeat, no changes

Dec 16 2009 10:13:08:560AM 1091216005 Robert Granetz
Shot 05 -- Plasma, full length. 0.6 MA, 3.9 T, nl_04=0.2e20 m-2, LSN, ohmic, cryopump. Next shot: set nl_04 to 0.25e20 m-2 (still have 0.4e20 m02 early in shot)

Dec 16 2009 10:15:18:747AM 1091216006 Robert Granetz

Shot 06 -- Plasma, full length. 0.6 MA, 3.9 T, 0.24e20 m-2, LSN, ohmic, cryopump Next shot: repeat, no changes

Dec 16 2009 10:29:12:887AM 1091216007 Robert Granetz

Shot 07 -- Plasma, but disrupted very early. Terrible startup. Looks just like the last shot yesterday 1091215036). Next shot: increase pre-fill pulse by another 4 ms

Dec 16 2009 10:41:48:917AM 1091216008 Robert Granetz

Shot 08 -- Plasma, but disrupted very early. Another bad startup, just like the previous shot. Next shot: add 5 ms more to pre-fill pulse (which will bring it to 52 ms

Dec 16 2009 10:59:06:213AM 1091216009 Robert Granetz

Shot 09 -- Plasma, full length. 0.6 MA, 3.9 T, 0.25e20 m-2, LSN, ohmic, cryopump. Huge hard x-ray signal, but we're resigned to this. Next shot: set nl_04 back to 0.2e20 m-2; also add 2 ms to pre-fill

Dec 16 2009 11:13:49:107AM 1091216010 Robert Granetz

Shot 10 -- Plasma, full length. The density didn't get down to 0.2e20 m-2 until late in the rampdown. Next shot: repeat, except shorten the programmed early density overshoot; add another 2 ms to pre-fill

Dec 16 2009 11:25:26:073AM 1091216011 Robert Granetz

Shot 11 -- Plasma, full length. 0.6 MA, 3.9 T, 0.2e20 m-2, LSN, ohmic, cryopump. Next shot: repeat; add +5 amps to IC_EF4

Dec 16 2009 11:37:06:183AM 1091216012 Robert Granetz

Shot 12 -- Plasma, full length. 0.6 MA, 3.9 T, 0.2e20 m-2, LSN, ohmic, cryopump. Only had a moderate hard x-ray amplitude. Decent startup. Next shot: set nl_04 to 0.3e20 m-2

Dec 16 2009 11:45:41:950AM 1091216013 Robert Granetz

Shot 13 -- Dud, no TF Next shot: try again

Dec 16 2009 11:59:33:107AM 1091216014 Robert Granetz

Shot 14 -- Plasma, full length. 0.6 MA, 3.9 T, 0.3e20 m-2, LSN, ohmic, cryopump. Startup is beginning to degrade. Next shot: repeat; increase pre-fill pulse by 2 ms; add +5 A to IC_EF4

Dec 16 2009 12:12:57:857PM 1091216015 Robert Granetz

Shot 15 -- Plasma, full length. 0.6 MA, 3.9 T, 0.3e20 m-2, LSN, ohmic, cryopump. Good startup. Pretty low level of hard x-rays. Next shot: set nl_04 to 0.4e20 m-2

Dec 16 2009 12:26:19:027PM 1091216016 Robert Granetz

Shot 16 -- Plasma, full length. 0.8 MA, 3.9 T, 0.4e20 m-2, LSN, ohmic, cryopump. Good startup. No hard x-rays. Next shot: repeat

Dec 16 2009 12:39:24:887PM 1091216017 Robert Granetz

Shot 17 -- Plasma, full length. 0.6 MA, 3.9 T, 0.4e20 m-2, LSN, ohmic, cryopump. Good startup, no hard x-rays. Next shot: increase nl_04 to 0.5e20 m-2

Dec 16 2009 12:53:01:107PM 1091216018 Robert Granetz

Shot 18 -- Plasma, full length. 0.6 MA, 3.9 T, 0.5e20 m-2, LSN, ohmic, cryopump. good startup, no runaways. Next shot: repeat, no changes

Dec 16 2009 01:06:01:900PM 1091216019 Robert Granetz

Shot 19 -- Plasma, full length. 0.8 MA, 3.9 T, 0.5e20 m-2, LSN, ohmic, cryopump. No hard x-rays. Next shot: set nl_04 to 0.6e20 m-2

Dec 16 2009 01:23:54:573PM 1091216020 Robert Granetz

Shot 20 -- Plasma, full length. 0.6 MA, 3.9 T, 0.6e20 m-2, LSN, ohmic, cryopump. No hard x-rays. Next shot: set Bt to 2.6 T (70.5 kA), Ip to 0.4 MA, nl_04 to 0.4e20 m-2 (The lower Bt requires some modification of the Itor programming in segment 1.)

Dec 16 2009 01:37:19:590PM 1091216021 Robert Granetz

Shot 21 -- Plasma, full length. 0.4 MA, 2.7 T, 0.4e20 m-2, LSN, ohmic, cryopump. No runaways. Next shot: tweak Bt to get 2.6 T (set Itf to 67900 A)

Dec 16 2009 01:51:17:667PM 1091216022 Robert Granetz

Shot 22 -- Fizzle, just barely. Fields and pressure look fine. I don't see why this one didn't go, and I don't have anything obvious that needs to be tweaked. Next shot: reduce pre-fill pulse by 2 ms

Dec 16 2009 01:57:21:027PM 1091216023 Robert Granetz

Shot 23 -- Plasma, full length. 0.4 MA, 2.6 T, 0.4e20 m-2, LSN, ohmic, cryopump. No runaways. Next shot: set nl_04 at 0.5e20 m-2

Dec 16 2009 02:20:56:573PM 1091216024 Robert Granetz

Shot 24 -- Plasma, disrupted at t=0.5 s due to an injection. Next shot: try again

Dec 16 2009 02:26:31:950PM 1091216025 Robert Granetz

Shot 25 -- Plasma, full length. 0.4 MA, 2.6 T, 0.5e20 m-2, LSN, ohmic, cryopump. No hard x-rays. The density varies a small amount around t=0.8-1 s, perhaps because of the OH1 crossover, which results in the plasma briefly touching the inboard wall. Next shot: increase CLEARIN by 2 mm and RCUR by 1 mm in an attempt to decrease the density variation.

Dec 16 2009 02:36:48:433PM 1091216026 Robert Granetz

Shot 26 -- Plasma, full length. Inboard gap increased by 2 mm, but it didn't affect the density variation. 0.4 MA, 2.6 T, 0.5e20 m-2, LSN, ohmic, cryopump. No runaways. Next shot: set nl_04 to 0.6e20 m-2

Dec 16 2009 02:58:56:400PM 1091216027 Robert Granetz

Shot 27 -- Plasma, full length. 0.4 MA, 2.9 T, 0.6e20 m-2, LSN, ohmic, cryopump. No hard x-rays. Next shot: change gears a bit...5.2 T, 1.0 MA, 0.3e20 m-2; do this by loading seg 2 from 1091215031 seg 2, and nl_04 from shot 23 today and set to 0.3e20 m-2, and move the integrator gate to start at t=0.1 s, and reload the TF programming in seg 1 from shot 1 today, and turn off the oh1_crossover test procedure

Dec 16 2009 03:05:08:730PM 1091216028 Robert Granetz

Shot 28 -- Plasma, full length. 1.0 MA, 5.2 T, but nl_04 goes from 0.6 to 0.8e20 m-2. Density is correctly programmed to be 0.3e20 m-2, and the B-main valve stays off, so the fueling must be coming from the wall due to the 1 MA plasma current. Cryopump is on. Only thing we can do is repeat this a few times to possibly degas the walls. Next shot: repeat, no changes

Dec 16 2009 03:15:39:230PM 1091216029 Robert Granetz

Shot 29 -- Plasma, full length. 1.0 MA, 5.2 T, nl_04=0.45-0.65e20 m-2, LSN, ohmic, cryopump. No hard x-rays. Density came down some, but we want 0.3e20 m-2. Next shot: try one more shot to see if the density comes down

Dec 16 2009 03:42:58:043PM 1091216031 Robert Granetz

Shot 30 -- Plasma, full length. 1.0 MA, 5.2 T, nl_04=0.45-0.65e20 m-2, LSN, ohmic, cryopump. Density did not come down significantly, so we'll declare this MP finished. Next MP296 - TS cross calibration with ECE at 3.9 T Next shot: load seg 1 from 1091208032 seg 1 (normal startup with cryopump), load seg 2 from 1080311022 (a cross-calibration shot w/density cutoff requested by J. Hughes & Y. Ma)

Dec 16 2009 03:47:08:277PM 1091216031 Robert Granetz

Shot 31 -- Dud. All fields & pressure look fine. Next shot: turn off cryopump; decrease pre-fill accordingly to 27 ms; reload engineering settings from 1091208032 (should have done this on the previous shot)

Dec 16 2009 04:08:20:293PM 1091216032 Robert Granetz

Shot 32 -- Plasma, disrupted at t=1.5 s due to the high density (possible detachment and a marfe). The density ramp did indeed cutoff all the ECE channels before the disruption, so this was a good shot for our purposes. 0.8 MA, 3.9 T, LSN, ohmic, no cryopump Next shot: slow down the programmed density ramp

Dec 16 2009 04:13:39:777PM 1091216033 Robert Granetz

Shot 33 -- Plasma, disrupted at t=1.5 s due to high density (detachment, marfe,...). All ECE channels were cutoff by the density ramp, as desired. 0.8 MA, 3.9 T, 1.0-1.8e20 m-2, LSN, ohmic, no cryopump. Next shot: shrink outer gap by 1 cm (increase RCUR by 5 mm)

Dec 16 2009 04:29:09:323PM 1091216034 Robert Granetz

Shot 34 -- Plasma, disrupted at t=1.5 s, again due to the high density ramp for the ECE cutoff. 0.8 MA, 3.9 T, 1.0-1.8e20 m-2, LSN, ohmic, no cryopump. Outer gap is now 1 cm (which is 1 cm less than the previous shot, as desired). Unfortunately, the GPC gate valve was closed, so we'll have to repeat. Next shot: repeat; purge B-side-lower and fill with 6 psi of N2 (at Matt Reinke's request); set N2 puff to go from t=0.35 to 0.45 s

Dec 16 2009 04:42:58:843PM 1091216035 Robert Granetz

Shot 35 -- Plasma, disrupted at t=1.48 s due to the high density ramp for the ECE cutoff. 0.8 MA, 3.9 T, 1.0-1.8e20 m-2, LSN, ohmic, no cryopump. Next shot: tweak B-field up by 0.05 T

Dec 16 2009 04:58:03:060PM 1091216036 Robert Granetz

Shot 36 -- Plasma, same as previous shot. End of this TS/ECE cross-calibration mini-run, Change to do one shot for tomorrow's run, as per the instructions of Ted G, Ron P., and Steve W. Next shot: read about it in tomorrow's Globe

Dec 16 2009 05:10:53:687PM 1091216037 Robert Granetz

Shot 37 -- Plasma, full length. This was to test the active MHD antennas, which were set to 850 kHz. The Mirnov coils clearly see. The toroidal field was ramped from 5.4 to 6.2 T to see if there was a resonance, but I don't think any was seen. 0.6 MA, 0.7e20 m-2, LSN, ohmic, no cryopump. Note: MP 590 End of run

Engineering Operator Comments

Shot Time Type Status Comment

1 09:01:46:107AM Plasma Bad OH2 camac crate off line

2 09:17:23:463AM Plasma Ok

3 09:31:17:433AM Plasma Ok

4 09:44:55:213AM Plasma Ok

5 09:57:50:713AM Plasma Ok

6 10:11:09:480AM Plasma Ok

7 10:24:06:963AM Plasma Ok

8 10:37:19:560AM Plasma Ok

9 10:50:21:603AM Plasma Ok

10 11:03:18:370AM Plasma Ok

11 11:16:56:167AM Plasma Ok

12 11:30:00:730AM Plasma Ok

13 11:43:04:167AM Plasma Ok

14 11:55:54:073AM Plasma Ok

15 12:08:49:493PM Plasma Ok

16 12:21:47:370PM Plasma Ok

17 12:34:50:747PM Plasma Ok

18 12:47:56:340PM Plasma Ok

19 01:00:55:857PM Plasma Ok

20 01:14:41:543PM Plasma Ok

21 01:27:41:200PM Plasma Ok

22 01:40:34:590PM Plasma Ok

23 01:53:25:107PM Plasma Ok

24 02:06:19:057PM Plasma Ok

25 02:19:15:057PM Plasma Ok

26 02:32:12:433PM Plasma Ok

27 02:45:12:073PM Plasma Ok

28 02:58:21:700PM Plasma Ok

29 03:11:07:997PM Plasma Ok

30 03:23:51:713PM Plasma Ok

31 03:36:42:607PM Plasma Ok

32 03:49:30:713PM Plasma Ok

33 04:02:50:620PM Plasma Ok

34 04:20:51:620PM Plasma Ok

35 04:33:32:743PM Plasma Ok

36 04:46:20:087PM Plasma Ok

37 04:58:58:513PM Plasma Ok

System Availability

Dec 16 2009 09:01:16:573AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD no secured - tagged out Jun 02 2008 11:03AM (sears) Joe Snipes Active MHD Antenna sears,snipes
BES yes 7 horizontal views spread out R_maj=[0.72-0.9m], 3 cm over the tokamak midplane (beam) Jul 09 2009 05:12PM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan
Bolometers yes 2pi (diode+foil), AXA, AXJ, WB3AX, WB4AX, LEDGE-AX working fine. MID-FOILS working fine. The LEDGE/DIV foils still need calibrations applied Aug 27 2009 09:09AM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization yes Nov 13 2009 06:37AM (dekow) Jim Irby Boronization dekow,irby
CNPA no Single channel CNPA available as of 12/1707 Jun 10 2009 10:22AM (twf) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor yes Operational Nov 09 2009 09:12AM (irby) Brian LaBombard Upper Divertor Cryopump irby,labombard
CXRS yes The wide-view toroidal array was installed, spatially and absolutely calibrated. There are 7 toroidal chords intersect the beam at the major_R_range=[74.2:83.6]cm. Spatial resolution: 1.2 cm. The F-top wide-view poloidal array was installed and spatially calibrated. There are 19 chords intersect the beam at the major_R_range=[0.65:0.9.]m. Spatial resolution: 1.22 cm. Jul 09 2009 05:16PM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,liao,rachmcd,rowan
D Alpha yes \ha2_bright is available; \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 is not available Jul 01 2009 09:45AM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes system is aligned and operating; not yet calibrated Jul 14 2009 02:22PM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation yes operational, but turned off Nov 03 2009 04:59PM (granetz) Robert Granetz Gas Jet granetz,whyte
Divertor IR no Mar 06 2007 10:50AM Glen Wurden Divertor IR Digital Video gwurden,terry
Divertor IR Spectroscopy no Mar 06 2007 10:51AM Glen Wurden Divertor IR Spectroscopy gwurden,terry
DNB no in test mode only Nov 03 2009 05:01PM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,gung
ECDC yes Nov 09 2009 09:13AM (irby) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer
FRC-ECE yes 31 of 32 channels working (Ch29 no signal) Dec 09 2009 11:01AM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes Gauge installed. Controller repaired. Aug 23 2009 10:36PM (toland) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
Glow Discharge no 6/10/09: Paddles meggered at 1000 v to machine ground (>300 Mohm) prior to closing the vacuum chamber. Plugs for Power Supply and Controls Unplugged and Red Tagged, Safe for In-Vessel Access Jun 10 2009 01:47PM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby
GPC yes Operational. Jul 28 2009 04:23PM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Most channels operational. Jul 28 2009 04:23PM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI yes The Xpt-view, the midplane-view cameras are operational. The innerwall GPI (coupled to the fast-diodes) is available. Jul 01 2009 09:45AM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes poses no safety hazard for people working around the machine Jun 18 2009 01:04PM (marmar) Earl Marmar H/D Ratio marmar
HEAT yes Oct 27 2009 10:39AM (dekow) Gary Dekow - Machine Heaters - burke,dekow
Hirex Jr yes Hirex-Jr has been installed and tested Jun 17 2009 11:54AM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr yes currently only one detector is operational, off-axis He-like argon emission Jul 14 2009 10:01AM (rice) John Rice High Resolution X-Ray ince,rice
HXR no In safe mode (high voltage turned off) May 27 2008 09:19PM (schmidt) Ron Parker Hard X-Ray Array parker,schmidt
ICRF D-Antenna yes operational at 80 MHz Jul 21 2009 04:49PM (wukitch) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes antenna and FFT operational Jul 21 2009 04:49PM (wukitch) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes available at 80 MHz and [0,pi,0,pi] phasing Sep 04 2009 10:01AM (wukitch) Steve Wukitch J-port antenna wukitch,ylin
Laser Blow-Off yes Requires some advance notice for laser start-up Oct 16 2009 12:46PM (g) Martin Greenwald Impurity Injection System g,nthoward
Lower Hybrid no Breaker locked and tagged out. Waveguide disassembly started. Open Waveguides have been shorted. May 28 2008 09:47AM (dterry) Ron Parker Lower Hybrid dterry,parker,wallaceg
LPI no Beam line removed May 30 2008 02:09PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha yes Midplane, WB4-LY, LEDGE-LY all collecting data. WB1-LY not attached. Aug 27 2009 09:10AM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes Operating normally Aug 27 2009 09:10AM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Operational. Recalibrated 7/27/09. Jul 28 2009 04:22PM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes Gauges are on. B-bottom is not operating - bad sensor head? Jul 14 2009 09:12PM (labombard) Brian LaBombard Baratron pressure gauges labombard
MLP no System is in edge lab. Version 2 drivers ready to test. Needs a student to help work on it. Jul 14 2009 09:20PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE no As of 6/10/09, MSE is calibrated & ready to go. Awaiting DNB. Jun 10 2009 10:34AM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Neutron detectors are calibrated and ready to go. Voltages will be turned on prior to first plasma. Jun 10 2009 10:35AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes Power back on morning of 11/09 before run Nov 09 2009 09:10AM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby
NINJA no Capillaries were tested in-vessel. Plenum has a leak and needs fixing. Jul 14 2009 09:14PM (labombard) Brian LaBombard NINJA gas puff labombard,terry
PCI yes Operational. Nov 12 2009 02:36PM (ntsujii) Miklos Porkolab Phase Contrast Imaging arai,edlund,ennever,ntsujii,porkolab
Penning Gauges yes High voltage is enabled (on during INIT, off during RECOOL). Jun 30 2009 09:42PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Jul 01 2009 09:46AM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter no Safe for Machine Entry Sep 14 2007 12:17PM (irby) Jim Irby C-Mod Polarimeter irby
Power - Alternator Air Switch yes Checked and Operational as of 06/18/09 Jun 19 2009 08:04AM (irby) Gary Dekow feeds all the other supplies cochran,dekow,dterry,irby
Power - PEI yes Nov 13 2009 06:38AM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby
Power - TMX yes Checked out and ready for Magnet Tests as of 06/18/09 Jun 19 2009 08:07AM (irby) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby
Power Systems yes Checked out and ready for Magnet Tests as of 06/18/09 Jun 19 2009 08:07AM (irby) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby
Probe Array - ISD yes Array is operational with new cPCI data system. Probe 14 has open circuit. Jul 14 2009 09:17PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH no LH launcher not installed. Cables are unplugged at the A-port rack. Jul 14 2009 09:16PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Array is operational with new cPCI data system. Jul 14 2009 09:16PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes Array is operational with new cPCI data system. Probe 13 has a bad cable (open). Jul 14 2009 09:17PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes Since 1091112000, 110 channel has been reinstalled. All channels are operational. Nov 12 2009 09:19AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Probe is operational. Needs plasma conditioning. Jul 14 2009 09:18PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Probe is operational. Needs plasma conditioning. Jul 14 2009 09:18PM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes System connected to A-port WASP. Needs plasma testing. Jul 14 2009 09:19PM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
Sparker yes Sparker back in operation before 11/09 run Nov 09 2009 09:11AM (irby) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin
TCI yes System restarted and aligned. Several chords available including NL04. Density Feedback available. Ready for plasma. Jun 18 2009 09:15AM (murray) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes 2 lasers working. 15 spatial channels operational. Calibrated Oct 13 2009 07:49PM (yma) Jerry Hughes Core Thomson scattering jwhughes,yma,zhang
TS - Edge yes Operational, and calibrated. Oct 11 2009 03:01PM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes,yma,zhang
Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf
XTOMO yes Operating normally Aug 27 2009 09:10AM (mlreinke) Bob Granetz X-Ray Tomography granetz,mlreinke

Session Leader Comments
Dec 16 2009 09:42:28:963AM	1091216003	Miklos Porkolab	Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.2E20 Shot disrupted around 0.6 sec.
Dec 16 2009 09:51:02:463AM	1091216004	Miklos Porkolab	Repeat shot 3. Another injection at 0.45 sec, disrupting shot.
Dec 16 2009 10:12:51:810AM	1091216005	Miklos Porkolab	Good shot. Assume finished run plan step 2. Bt= 3.9T, Ip = 0.6 MA, nl04 = 0.20. Moving on to higher density the next shot. No Thomson, laser did not fire. Will come back to this density later.
Dec 16 2009 10:20:43:637AM	1091216006	Miklos Porkolab	Good shot at Bt = 3.9 T, Ip = 0.6 MA,nl04= 0.25. (run plan step 3). Some hard x rays. Will repeat this shot. Thomson fired on this shot. Then will come back to repeat nl04 = 0.20E20.
Dec 16 2009 10:30:49:027AM	1091216007	Miklos Porkolab	Very short shot, early disruption at 0.1 sec.
Dec 16 2009 10:44:00:573AM	1091216008	Miklos Porkolab	Another short pulse, disrupted early. Will increase the fill pressure.
Dec 16 2009 11:12:55:980AM	1091216009	Miklos Porkolab	Excellent shot. Bt= 3.9 T, Ip = 0.6 MA, nl04 = 0.25. Will go down in density to nl04 = 0.20 or next shot.
Dec 16 2009 11:18:15:527AM	1091216010	Miklos Porkolab	Good shot, but the density is a little high early on. Bt= 3.9 T, Ip = 0.6 MA. Good for another data point at nl04 = 0.25E20. The density came down to nl04 = 0.2 only after 1.0 sec. So lets repeat shot and lower fill pressure early on.
Dec 16 2009 11:23:53:573AM	1091216011	Miklos Porkolab	Good shot, density at 0.20E20 from 0.8 -1.5 sec. Bt = 3.9 T, Ip = 0.6 MA. Hard X rays steady. All diagnostic working. Lets repeat this same shot for statistics then increase density.
Dec 16 2009 11:39:14:417AM	1091216012	Miklos Porkolab	Excellent shot, it was a repeat for nl04 = 0.2 from 0.8-1.5 sec. Bt = 3.9 T, Ip = 0.6 MA. So this was shot 2 on the shot sequence. All diagnostics fired. We will now increase the density on the next shot, up to nl04 = 0.3E20, same field and current.
Dec 16 2009 11:54:00:730AM	1091216013	Miklos Porkolab	This will be shot 5 on the original shot plan. Aim for Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.3E20. Result: there was no TF field on this shot for some reason. Will repeat the shot.
Dec 16 2009 12:01:18:310PM	1091216014	Miklos Porkolab	Good shot, got the density we wanted, nl04 = 0.3E20. Bt= 3.9 T, Ip = 0.6 MA. So completed 5 of the proposed shot sequence. We will repeat the shot next for 6 of the sequence.
Dec 16 2009 12:23:42:277PM	1091216015	Miklos Porkolab	Good shot, #6 in the sequence completed. Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.3E20. Almost no hard x rays on this shot. Moving on to # 7 in the shot sequence next shot.
Dec 16 2009 12:27:12:340PM	1091216016	Miklos Porkolab	Good shot, # 7 in the sequence. Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.4E20. Good thermal shot, almost no runaways. Will repeat next shot (#8 in sequence).
Dec 16 2009 12:42:30:090PM	1091216017	Miklos Porkolab	Good repeat shot at a density of nl04 = 0.40. Bt = 3.9 T, Ip = 0.6 MA. Good thermal shot. Completed # 8 in the shot sequence. Moving on to # 9 in the next shot.
Dec 16 2009 12:54:42:540PM	1091216018	Miklos Porkolab	Aiming for #9 in the sequence. Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.5. Good shot, but couple of little bumps on the density at t= 0.6 sec and 1.2 sec. Lets repeat the shot.
Dec 16 2009 01:09:18:060PM	1091216019	Miklos Porkolab	Good thermal shot. No hard X rays. Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.5E20. Good repeat shot of planned sequence # 9. Moving on to #10, with target density of 0.6.
Dec 16 2009 01:20:55:197PM	1091216020	Miklos Porkolab	Target shot sequence # 10. Bt = 3.9 T, Ip = 0.6 MA, nl04 = 0.6E20. Shot is excellent, right on the money ! With this, we have completed the 3.9 T sequence. Next shot will be # 11 in the proposed sequence at 2.6 T.
Dec 16 2009 01:33:51:950PM	1091216021	Miklos Porkolab	Shot # 11 in the sequence for the day. Bt = 2.6 T, Ip = 0.4 MA, target density nl04 = 0.4. OK, there was a little glitch in the density at 0.9 sec (cross-over) and the Bt field was a little high (2.7 T). So will repeat the shot and lower the Bt field.
Dec 16 2009 01:43:07:107PM	1091216022	Miklos Porkolab	Repeat of shot sequence #11, called #12 in the runplan. Bt = 0.26 T, Ip = 0.4 MA, nl04 = 0.4E20. Fizzle.Need to repeat.
Dec 16 2009 01:59:29:777PM	1091216023	Miklos Porkolab	Bt = 2.60 T, Ip = 0.4 MA, nl04 = 0.4E20 ; Density good and steady between 1.0 - 1.5 second. (the density glitch at 0.9 sec is due to crossover.) Moving on the shot sequence # 13, with target density 0.5E20. Bt and Ip remain the same.
Dec 16 2009 02:13:44:120PM	1091216024	Miklos Porkolab	Shot sequence # 13 in the plans. Bt = 2.6 T, Ip = 0.4 MA, nl04 = 0.5E20. Disrupted at 0.5 sec due to random injection.
Dec 16 2009 02:26:56:997PM	1091216025	Miklos Porkolab	Repeat attempt to get shot #13. Bt = 2.6 T, Ip = 0.4 MA, nl04 = 0.5E20. Density is somewhat variable near 1 sec. Plasma is hitting the wall. Proposal is to move density away 2 mm from the wall to see if we can get a steady density around 1.0 sec. Repeat shot otherwise. Still target # 13.
Dec 16 2009 02:41:26:747PM	1091216026	Miklos Porkolab	Shot sequence # 13 repeated, with same parameters as previous shot 25. (Bt = 2.6 T, Ip = 0.4 MA, nl04 = 0.5E20). Nothing has changed from previous shot in spite of changing the inner wall gap. So we will declare this a success and move on to the next higher density, 0.6E20 at 2.6T (shot sequence #14).
Dec 16 2009 02:52:02:573PM	1091216027	Miklos Porkolab	Shot sequence #14 in the plan. Bt = 2.6 T, Ip = 0.4 MA, nl04 = 0.6. Yes, excellent shot, density right on, shot sequence at 2.6 T complete. Moving back to 5.2 T, 1 MA, for a few repeat shot from yesterday. Aim for nl04 = 0.3
Dec 16 2009 03:12:37:370PM	1091216028	Miklos Porkolab	Repeat from Dec 15th, Bt = 5.2 T, Ip = 1.0 MA, aim for nl04 = 0.3. However, wall was fueling and density ended up at nl04 = 0.6 - 0.7. Thermal shot. Will need to repeat to see if density drops.
Dec 16 2009 03:14:51:540PM	1091216029	Miklos Porkolab	Try once more at 5.2 T. Ip = 1.0 MA. nl04 = 0.55 . Slighlty less than before. Try one more shot .
Dec 16 2009 03:41:38:963PM	1091216031	Yunxing Ma	no plasma shot
Dec 16 2009 04:03:15:683PM	1091216032	Yunxing Ma	good shot. plasma lasted full length
Dec 16 2009 04:05:13:667PM	1091216032	Yunxing Ma	ECE cutoffs. density ramp a littler earlier. Delay the starting time of density ramp up next shot
Dec 16 2009 09:41:36:513PM	1091216037	Theodore Golfinopoulos	Shot Summary: Goal: *** Wide sweep of B_T to try to move AE resonant frequency across constant antenna drive frequency of 850 kHz. Also, preview of run tomorrow. Result: *** Bt: 5.4-6.2T Ip: 0.6 MA Nl04: 0.7E20 Picrf: 0 MW Plasma. Active MHD equipment functioning as expected. Cannot see clear resonance; note spectrogram of some probes shows some response between 600 kHz and 800 kHz which is most likely an artifact of the probes' own resonance. Indeed, BP_EF_BOT and BP_BC_BOT do not show any activity in this region, and these probes have higher-frequency resonances. Tried to load settings from 1080403010, but didn't have time to use same equilibrium or set up RF. AMHD antenna current 10 A flat - okay. RFENABLE was on from 0 to 2 s - should only be on from 0.5-1.5 s - this explains funky slow step-wise modulation in antenna current outside 0.5-1.5 s. FTAE calculation in DPCS is funny - reports -690 kHz. Fix. Next Shot: ******** Load equilibrium from 1080403010 and try again a broad B_T sweep. (Now, RF on at Picrf=2 MW.) Keep active MHD antenna drive frequency at 850 kHz for now. RFENABLE on only from 0.5-1.5 s.

Physics Operator Comments
Dec 16 2009 10:25:01:497AM	1091216001	Robert Granetz	Shot 01 -- No-power cycle due to INIT failure on OH2 modules. Next shot: try again
Dec 16 2009 10:25:36:700AM	1091216001	Robert Granetz	INIT failed on shot 1. OH2 decoder failed to init.
Dec 16 2009 10:28:07:543AM	1091216002	Robert Granetz	Shot 02 -- Plasma, full length, but ratty startup. 0.6 MA, 3.97 T, 0.15-0.2e20 m-2, LSN, ohmic, cryopump on. Huge hard x-ray signal, as expected. OH2U coax resistance warning of 3 uohm. Next shot: increase pre-fill pulse by 4 ms, reduce Itor to 106 kA.
Dec 16 2009 10:20:04:933AM	1091216003	Robert Granetz	Shot 03 -- Plasma, disrupted at t=0.63 s. I think it was a locked mode right from the beginning. 0.6 MA, 3.9 T, 0.2e20 m-2, LSN, ohmic, cryopump. Nice startup. Next shot: program nl_04 to start at 0.4e20 m-2 and then come down to 0.2e20 m-2 at around t=0.35 s, which will hopefully prevent early mode locking; also start integrator for B21_PROJ wire at t=0.1 s (was t=0.2 s)
Dec 16 2009 10:17:58:637AM	1091216004	Robert Granetz	Shot 04 -- Plasma, but disrupted at t=0.45 s. This one was sawtoothing, so we solved the locked mode problem. I think it was an injection at t=0.44 s. 0.6 MA, 3.9 T, nl_04 was coming down to 0.2e20 m-2. Next shot: repeat, no changes
Dec 16 2009 10:13:08:560AM	1091216005	Robert Granetz	Shot 05 -- Plasma, full length. 0.6 MA, 3.9 T, nl_04=0.2e20 m-2, LSN, ohmic, cryopump. Next shot: set nl_04 to 0.25e20 m-2 (still have 0.4e20 m02 early in shot)
Dec 16 2009 10:15:18:747AM	1091216006	Robert Granetz	Shot 06 -- Plasma, full length. 0.6 MA, 3.9 T, 0.24e20 m-2, LSN, ohmic, cryopump Next shot: repeat, no changes
Dec 16 2009 10:29:12:887AM	1091216007	Robert Granetz	Shot 07 -- Plasma, but disrupted very early. Terrible startup. Looks just like the last shot yesterday 1091215036). Next shot: increase pre-fill pulse by another 4 ms
Dec 16 2009 10:41:48:917AM	1091216008	Robert Granetz	Shot 08 -- Plasma, but disrupted very early. Another bad startup, just like the previous shot. Next shot: add 5 ms more to pre-fill pulse (which will bring it to 52 ms
Dec 16 2009 10:59:06:213AM	1091216009	Robert Granetz	Shot 09 -- Plasma, full length. 0.6 MA, 3.9 T, 0.25e20 m-2, LSN, ohmic, cryopump. Huge hard x-ray signal, but we're resigned to this. Next shot: set nl_04 back to 0.2e20 m-2; also add 2 ms to pre-fill
Dec 16 2009 11:13:49:107AM	1091216010	Robert Granetz	Shot 10 -- Plasma, full length. The density didn't get down to 0.2e20 m-2 until late in the rampdown. Next shot: repeat, except shorten the programmed early density overshoot; add another 2 ms to pre-fill
Dec 16 2009 11:25:26:073AM	1091216011	Robert Granetz	Shot 11 -- Plasma, full length. 0.6 MA, 3.9 T, 0.2e20 m-2, LSN, ohmic, cryopump. Next shot: repeat; add +5 amps to IC_EF4
Dec 16 2009 11:37:06:183AM	1091216012	Robert Granetz	Shot 12 -- Plasma, full length. 0.6 MA, 3.9 T, 0.2e20 m-2, LSN, ohmic, cryopump. Only had a moderate hard x-ray amplitude. Decent startup. Next shot: set nl_04 to 0.3e20 m-2
Dec 16 2009 11:45:41:950AM	1091216013	Robert Granetz	Shot 13 -- Dud, no TF Next shot: try again
Dec 16 2009 11:59:33:107AM	1091216014	Robert Granetz	Shot 14 -- Plasma, full length. 0.6 MA, 3.9 T, 0.3e20 m-2, LSN, ohmic, cryopump. Startup is beginning to degrade. Next shot: repeat; increase pre-fill pulse by 2 ms; add +5 A to IC_EF4
Dec 16 2009 12:12:57:857PM	1091216015	Robert Granetz	Shot 15 -- Plasma, full length. 0.6 MA, 3.9 T, 0.3e20 m-2, LSN, ohmic, cryopump. Good startup. Pretty low level of hard x-rays. Next shot: set nl_04 to 0.4e20 m-2
Dec 16 2009 12:26:19:027PM	1091216016	Robert Granetz	Shot 16 -- Plasma, full length. 0.8 MA, 3.9 T, 0.4e20 m-2, LSN, ohmic, cryopump. Good startup. No hard x-rays. Next shot: repeat
Dec 16 2009 12:39:24:887PM	1091216017	Robert Granetz	Shot 17 -- Plasma, full length. 0.6 MA, 3.9 T, 0.4e20 m-2, LSN, ohmic, cryopump. Good startup, no hard x-rays. Next shot: increase nl_04 to 0.5e20 m-2
Dec 16 2009 12:53:01:107PM	1091216018	Robert Granetz	Shot 18 -- Plasma, full length. 0.6 MA, 3.9 T, 0.5e20 m-2, LSN, ohmic, cryopump. good startup, no runaways. Next shot: repeat, no changes
Dec 16 2009 01:06:01:900PM	1091216019	Robert Granetz	Shot 19 -- Plasma, full length. 0.8 MA, 3.9 T, 0.5e20 m-2, LSN, ohmic, cryopump. No hard x-rays. Next shot: set nl_04 to 0.6e20 m-2
Dec 16 2009 01:23:54:573PM	1091216020	Robert Granetz	Shot 20 -- Plasma, full length. 0.6 MA, 3.9 T, 0.6e20 m-2, LSN, ohmic, cryopump. No hard x-rays. Next shot: set Bt to 2.6 T (70.5 kA), Ip to 0.4 MA, nl_04 to 0.4e20 m-2 (The lower Bt requires some modification of the Itor programming in segment 1.)
Dec 16 2009 01:37:19:590PM	1091216021	Robert Granetz	Shot 21 -- Plasma, full length. 0.4 MA, 2.7 T, 0.4e20 m-2, LSN, ohmic, cryopump. No runaways. Next shot: tweak Bt to get 2.6 T (set Itf to 67900 A)
Dec 16 2009 01:51:17:667PM	1091216022	Robert Granetz	Shot 22 -- Fizzle, just barely. Fields and pressure look fine. I don't see why this one didn't go, and I don't have anything obvious that needs to be tweaked. Next shot: reduce pre-fill pulse by 2 ms
Dec 16 2009 01:57:21:027PM	1091216023	Robert Granetz	Shot 23 -- Plasma, full length. 0.4 MA, 2.6 T, 0.4e20 m-2, LSN, ohmic, cryopump. No runaways. Next shot: set nl_04 at 0.5e20 m-2
Dec 16 2009 02:20:56:573PM	1091216024	Robert Granetz	Shot 24 -- Plasma, disrupted at t=0.5 s due to an injection. Next shot: try again
Dec 16 2009 02:26:31:950PM	1091216025	Robert Granetz	Shot 25 -- Plasma, full length. 0.4 MA, 2.6 T, 0.5e20 m-2, LSN, ohmic, cryopump. No hard x-rays. The density varies a small amount around t=0.8-1 s, perhaps because of the OH1 crossover, which results in the plasma briefly touching the inboard wall. Next shot: increase CLEARIN by 2 mm and RCUR by 1 mm in an attempt to decrease the density variation.
Dec 16 2009 02:36:48:433PM	1091216026	Robert Granetz	Shot 26 -- Plasma, full length. Inboard gap increased by 2 mm, but it didn't affect the density variation. 0.4 MA, 2.6 T, 0.5e20 m-2, LSN, ohmic, cryopump. No runaways. Next shot: set nl_04 to 0.6e20 m-2
Dec 16 2009 02:58:56:400PM	1091216027	Robert Granetz	Shot 27 -- Plasma, full length. 0.4 MA, 2.9 T, 0.6e20 m-2, LSN, ohmic, cryopump. No hard x-rays. Next shot: change gears a bit...5.2 T, 1.0 MA, 0.3e20 m-2; do this by loading seg 2 from 1091215031 seg 2, and nl_04 from shot 23 today and set to 0.3e20 m-2, and move the integrator gate to start at t=0.1 s, and reload the TF programming in seg 1 from shot 1 today, and turn off the oh1_crossover test procedure
Dec 16 2009 03:05:08:730PM	1091216028	Robert Granetz	Shot 28 -- Plasma, full length. 1.0 MA, 5.2 T, but nl_04 goes from 0.6 to 0.8e20 m-2. Density is correctly programmed to be 0.3e20 m-2, and the B-main valve stays off, so the fueling must be coming from the wall due to the 1 MA plasma current. Cryopump is on. Only thing we can do is repeat this a few times to possibly degas the walls. Next shot: repeat, no changes
Dec 16 2009 03:15:39:230PM	1091216029	Robert Granetz	Shot 29 -- Plasma, full length. 1.0 MA, 5.2 T, nl_04=0.45-0.65e20 m-2, LSN, ohmic, cryopump. No hard x-rays. Density came down some, but we want 0.3e20 m-2. Next shot: try one more shot to see if the density comes down
Dec 16 2009 03:42:58:043PM	1091216031	Robert Granetz	Shot 30 -- Plasma, full length. 1.0 MA, 5.2 T, nl_04=0.45-0.65e20 m-2, LSN, ohmic, cryopump. Density did not come down significantly, so we'll declare this MP finished. Next MP296 - TS cross calibration with ECE at 3.9 T Next shot: load seg 1 from 1091208032 seg 1 (normal startup with cryopump), load seg 2 from 1080311022 (a cross-calibration shot w/density cutoff requested by J. Hughes & Y. Ma)
Dec 16 2009 03:47:08:277PM	1091216031	Robert Granetz	Shot 31 -- Dud. All fields & pressure look fine. Next shot: turn off cryopump; decrease pre-fill accordingly to 27 ms; reload engineering settings from 1091208032 (should have done this on the previous shot)
Dec 16 2009 04:08:20:293PM	1091216032	Robert Granetz	Shot 32 -- Plasma, disrupted at t=1.5 s due to the high density (possible detachment and a marfe). The density ramp did indeed cutoff all the ECE channels before the disruption, so this was a good shot for our purposes. 0.8 MA, 3.9 T, LSN, ohmic, no cryopump Next shot: slow down the programmed density ramp
Dec 16 2009 04:13:39:777PM	1091216033	Robert Granetz	Shot 33 -- Plasma, disrupted at t=1.5 s due to high density (detachment, marfe,...). All ECE channels were cutoff by the density ramp, as desired. 0.8 MA, 3.9 T, 1.0-1.8e20 m-2, LSN, ohmic, no cryopump. Next shot: shrink outer gap by 1 cm (increase RCUR by 5 mm)
Dec 16 2009 04:29:09:323PM	1091216034	Robert Granetz	Shot 34 -- Plasma, disrupted at t=1.5 s, again due to the high density ramp for the ECE cutoff. 0.8 MA, 3.9 T, 1.0-1.8e20 m-2, LSN, ohmic, no cryopump. Outer gap is now 1 cm (which is 1 cm less than the previous shot, as desired). Unfortunately, the GPC gate valve was closed, so we'll have to repeat. Next shot: repeat; purge B-side-lower and fill with 6 psi of N2 (at Matt Reinke's request); set N2 puff to go from t=0.35 to 0.45 s
Dec 16 2009 04:42:58:843PM	1091216035	Robert Granetz	Shot 35 -- Plasma, disrupted at t=1.48 s due to the high density ramp for the ECE cutoff. 0.8 MA, 3.9 T, 1.0-1.8e20 m-2, LSN, ohmic, no cryopump. Next shot: tweak B-field up by 0.05 T
Dec 16 2009 04:58:03:060PM	1091216036	Robert Granetz	Shot 36 -- Plasma, same as previous shot. End of this TS/ECE cross-calibration mini-run, Change to do one shot for tomorrow's run, as per the instructions of Ted G, Ron P., and Steve W. Next shot: read about it in tomorrow's Globe
Dec 16 2009 05:10:53:687PM	1091216037	Robert Granetz	Shot 37 -- Plasma, full length. This was to test the active MHD antennas, which were set to 850 kHz. The Mirnov coils clearly see. The toroidal field was ramped from 5.4 to 6.2 T to see if there was a resonance, but I don't think any was seen. 0.6 MA, 0.7e20 m-2, LSN, ohmic, no cryopump. Note: MP 590 End of run

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:01:46:107AM	Plasma	Bad	OH2 camac crate off line
2	09:17:23:463AM	Plasma	Ok
3	09:31:17:433AM	Plasma	Ok
4	09:44:55:213AM	Plasma	Ok
5	09:57:50:713AM	Plasma	Ok
6	10:11:09:480AM	Plasma	Ok
7	10:24:06:963AM	Plasma	Ok
8	10:37:19:560AM	Plasma	Ok
9	10:50:21:603AM	Plasma	Ok
10	11:03:18:370AM	Plasma	Ok
11	11:16:56:167AM	Plasma	Ok
12	11:30:00:730AM	Plasma	Ok
13	11:43:04:167AM	Plasma	Ok
14	11:55:54:073AM	Plasma	Ok
15	12:08:49:493PM	Plasma	Ok
16	12:21:47:370PM	Plasma	Ok
17	12:34:50:747PM	Plasma	Ok
18	12:47:56:340PM	Plasma	Ok
19	01:00:55:857PM	Plasma	Ok
20	01:14:41:543PM	Plasma	Ok
21	01:27:41:200PM	Plasma	Ok
22	01:40:34:590PM	Plasma	Ok
23	01:53:25:107PM	Plasma	Ok
24	02:06:19:057PM	Plasma	Ok
25	02:19:15:057PM	Plasma	Ok
26	02:32:12:433PM	Plasma	Ok
27	02:45:12:073PM	Plasma	Ok
28	02:58:21:700PM	Plasma	Ok
29	03:11:07:997PM	Plasma	Ok
30	03:23:51:713PM	Plasma	Ok
31	03:36:42:607PM	Plasma	Ok
32	03:49:30:713PM	Plasma	Ok
33	04:02:50:620PM	Plasma	Ok
34	04:20:51:620PM	Plasma	Ok
35	04:33:32:743PM	Plasma	Ok
36	04:46:20:087PM	Plasma	Ok
37	04:58:58:513PM	Plasma	Ok