Alcator C-Mod Run 1120830 Information

Miniproposals

Miniproposal: 692

Date Filed: 1/11/2012

Title: The influence of ion temperature profiles and toroidal rotation profiles on the formation of ITBs in

First Author: Catherine Fiore

Session Leader: Catherine Fiore (shots 1-32)

Operators
Session leader(s):	Catherine Fiore
Physics operator(s):	Greg Wallace
Engineering operator(s):	Sam Pierson,Bill Byford,Roza Tesfaye

Engineering Operator Run Comment
MP692 temperature profiles and toroidal rotation profiles

Session Leader Plans

Entered: Aug 29 2012 02:12:05:790PM

Author: Catherine Fiore

This run is in support of MP692 The influence of ion temperature profiles and toroidal rotation profiles on the formation of ITBs in I-mode plasmas.

Target shot for physics:1120828027, with 5.4 T, 1.0 MA, 1 x 10^20 nl_04, 3 MW ICRF

If a reversed field locked mode shot is obtained prior to this run, we will start with that for the first 1-3 shots for the HIREX calibration. If a shot has not been developed, spend 3 or 4 shots trying to develop one.

Setup target shot and obtain an I-mode plasma (1-3 shots) ensuring that the required diagnostic set for modeling is obtained.

Lower the field to 4.5 T and run at least 5 shots to see if we can get I-mode with ITB with the off axis heating. Matt Reinke will want at least one of these to inject Moly with fast Hirex timing.

Raise the field to 6.25 T and repeat as above, at least 5 shots.

In either case, if an ITB is formed, we need to repeat several shots to make sure we have a full data set useful for modeling.

Next, leaving the field and current at 6.25 and 1 MA, lower the nl_04 to 0.8 x 10^20 for 5 shots.

Next, return the field to 4.5 T and nl_04 to 0.8 x 10^20 for 5 shots.

If time permits, try going up in density for both magnetic field settings.

Physics Operators Plans

Entered: Aug 29 2012 01:44:25:560PM

Author: Greg Wallace

Engineering setup for Thursday 2012/08/30

MP 692 The influence of ion temperature profiles and toroidal rotation profiles on the
formation of ITBs in I-mode plasmas

Session leader: C. Fiore
Physics operator: G. Wallace

ECDC in Deuterium overnight

Power systems as on: 1120828027 (rev B, 5.7 T, 1 MA, 8.5e19 m-2, LSN).

A-coil configuration: -Dtop +Dbot +Jtop -Jbot; Hybrid enabled (reversed
field configuration)

Gas Setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 2 psi Ne Hybrid DISABLED (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
fill H-bottom with 1 psi Ar Hybrid enabled(PG5)
leave B-div as is Hybrid DISABLED (PG6)
leave H-div as is Hybrid DISABLED (PG7)
fill NINJA F-port with 10 psi D2 DISABLED
fill NINJA C-port with 10 psi He DISABLED

Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo, HIREX-Sr, Xeus, LoWEUS

Torvac setup: keep gate valves open during pulse

Required systems: ICRF (3+ MW)

Required diagnostics: CXRS, GPI, LBO w/CaF2, IR thermography & TC's,
HIREX-SR, TS, ECE, reflectometry

Desired diagnostics: DNB, CECE, HIREX-JR

------------------------------------------------------------------------------
Boronization overnight: no
ICRF: yes, up to 5 MW
LH: no
Impurity injector: yes, w/CaF2
DNB: desirable
Cryopump: no
------------------------------------------------------------------------------

Session Leader Summaries

Entered: Aug 30 2012 05:30:45:377PM

Author: Catherine Fiore

This run is in support of MP692 The influence of ion temperature profiles and toroidal rotation profiles on the formation of ITBs in I-mode plasmas.

Target shot for physics:1120828027, with 5.4 T, 1.0 MA, 1 x 10^20 nl_04, 3 MW ICRF

If a reversed field locked mode shot is obtained prior to this run, we will start with that for the first 1-3 shots for the HIREX calibration. If a shot has not been developed, spend 3 or 4 shots trying to develop one.

Setup target shot and obtain an I-mode plasma (1-3 shots) ensuring that the required diagnostic set for modeling is obtained.

Lower the field to 4.5 T and run at least 5 shots to see if we can get I-mode with ITB with the off axis heating. Matt Reinke will want at least one of these to inject Moly with fast Hirex timing.

Raise the field to 6.25 T and repeat as above, at least 5 shots.

In either case, if an ITB is formed, we need to repeat several shots to make sure we have a full data set useful for modeling.

Next, leaving the field and current at 6.25 and 1 MA, lower the nl_04 to 0.8 x 10^20 for 5 shots.

Next, return the field to 4.5 T and nl_04 to 0.8 x 10^20 for 5 shots.

If time permits, try going up in density for both magnetic field settings.

Score card: 32 attempts, 2 fizzles, 1 dud, 2 early disruptions, 4 shots for diagnostic calibration, 15 good ITB shots. 1 possible short ITB but not in I-mode.

We were very successful at making I-modes with off-axis ICRF on both the low and high field side of the plasma. The low field side operation caused too much heating of limiters and the shoe-lace antenna, and was difficult to prevent excessive impurities from entering the machine. Thus we did not fully explore the parameter space on the low field side.

The plasma rotation was quite high in the co-current direction in the high field side I-modes. Several of these will be ideal for stability analysis, especially shot 28.

In addition, there is probably useful data on I-mode threshholds especially from the low field side shots.

Overall, this was quite a useful and productive run despite the lack of ITB formation. It will definitely contribute to understanding the transport physics for CMod-ITBs.

__________________________________________________________

112083001--pressure issue from programming error. Fizzle

112083002--H-mode, probably too high of a density. We will try to repeat.

112083003--Nice I-mode at 1 s. Hirex has good data. We will proceed with the run plan and try to get a locked mode

112083004--Lock mode was obtained, but was not judged to be long enough by the Hirex group. We will make another attempt.

112083005--Lock mode was obtained. We will proceed with the high field side off-axis ICRF ITB in I-mode attempt

112083006--No plasma, power supply issue.

112083007--Elmy I mode? It went into H mode eventually, so we will reduce the density slightly. No sign of an ITB

112083008--A short H-mode is followed by a longer I-mode. No sign of a density ITB. We will reduce the gas at .4 s to see if we can keep it out of H-mode.

112083009- I-mode. No sign of a density ITB. We will reduce the magnetic field to 4.3 T

112083010- I-mode. No sign of a density ITB. We will try and keep the density up after the I-mode develops.

112083011-- I-mode. No sign of a density ITB. We will continue to try and keep the density up after the I-mode develops.

112083012- I-mode. No sign of a density ITB. The plasma disrupted at 1.2 s, probable stainless steel entry. The density stayed up better. Repeat.

112083013- I-mode. No sign of a density ITB. We will go back to conditions for shot 10.

112083014- Intermittant I-mode because of rf drop outs.. No sign of a density ITB. Repeat.

1120830015--Steady good I-mode. No sign of a density ITB. We will take a calibration shot for Thomson

1120830016--Calibration shot for Thomson. Unfortunately they failed to reach cut off for the ECE. We are setting up for low field side I mode operation for the next shot.

1120803017--Plasma remains in L-mode for this shot. We will increase the ICRF power back up to 3MW.

1120830018--Plasma remains in L-mode until very late in the rf pulse. We will increase the ICRF power to 3.5MW.

1120830019--Plasma remains in L-mode until the density drops. We will increase the ICRF power to 3.8MW. to try and get the I-mode earlier.

1120830020--Plasma remains in L-mode until the density drops. Ther was a nice I-mode for 300 ms, but the radiated power has gone up. It was alos pointed out that the magnetic field was a little lower than we had specified, so we are bringing that up to 6.2 T. We will raise the current to 1.1 MW and step up the ICRF power to 4 MW in 2 steps.

1120830021--Plasma remains in L-mode until the density drops. There was a nice I-mode, but we are getting impurities off of the limiter.

1120830022--Plasma remains in L-mode until the density drops. There were several I-modes, but we are getting impurities are getting worse. We will drop the field to 6.1 T to get away from the limiter. Current will be decreased to 1 MW

1120830023--No I-mode, and the plasma disrupts when the rf power is stepped up to 4 MW. We will take a shot at constant 3 MW ICRF power to get data for LBO and Ninja at this field, likely without an I-mode.

1120830024--No I-mode, and the plasma disrupts at 1.2 s. We need to retake this shot to get data for LBO and Ninja at this field, but we are increasing the target density to (hopefully) spare the shoelace antenna.

1120830025--Probably no I-mode unless between 1 and 1.2 s. We are going back to high field side operation for the next shot.

1120830026--Disrupted early, before RF comes on. Moly injection?

1120830027--Disrupted early, before RF comes on. Locked mode?

1120830028--Good long I-mode. No sign of ITB. We will raise the density for the next shot.

1120830029--Good long I-mode, but a short H-mode. No sign of ITB. Next shot will be Thomson calibration with ECE cut-offs

1120830030--Thomson calibration shot, but did not seem to get the cut offs they required. We are returning to the I-mode portion of the program continuing with a density increase to 1.1 nl_04.

1120830031--Fizzle

1120830032--No I-mode, 2 short H-modes, possible ITB development in the H-mode, albeit very short lived.

Physics Operator Summaries

Entered: Aug 30 2012 05:06:59:523PM

Author: Greg Wallace

PO Summary for 1120830

Overall the machine ran well today. We had 2 fizzles and 1 dud. The first fizzle and the dud were operator error (loaded a cryo startup for shot 1 [although the title of the segment loaded explicitly said non-cryo], while the dud was caused by setting the TF current limit too low). The 2nd fizzle immediately followed a 1.0 MA ECE cutoff disruption.

We had some issues with disruptions at lower density and higher ICRF power levels. Two attempts at ECE cutoff shots for TS were unable to reach high enough density. Several attempts were made at locked-mode calibration shots for HIREXSR. We were able to get locked modes although the plasma disrupted about 100 ms after locking each time.

Session Leader Comments

Aug 30 2012 09:16:33:397AM 1120830001 Catherine Fiore 112083001--pressure issue from programming error. Fizzle

Aug 30 2012 09:29:20:340AM 1120830002 Catherine Fiore 112083002--H-mode, probably too high of a density. We will try to repeat.

Aug 30 2012 09:38:16:897AM 1120830003 Catherine Fiore 112083003--Nice I-mode. Hirex has good data. We will proceed with the run plan and try to get a locked mode.

Aug 30 2012 09:50:37:230AM 1120830004 Catherine Fiore 112083004--Lock mode was obtained, but was not judged to be long enough by the Hirex group. We will make another attempt.

Aug 30 2012 10:11:34:847AM 1120830005 Catherine Fiore 112083005--Lock mode was obtained. We will proceed with the high field side off-axis ICRF ITB in I-mode attempt

Aug 30 2012 10:12:01:617AM 1120830005 Catherine Fiore 112083005--Lock mode was obtained. We will proceed with the high field side off-axis ICRF ITB in I-mode attempt

Aug 30 2012 10:12:35:747AM 1120830006 Catherine Fiore 112083006--No plasma, power supply issue

Aug 30 2012 11:06:28:417AM 1120830007 Catherine Fiore 112083007--Elmy I mode? It went into H mode eventually, so we will reduce the density slightly. No sign of an ITB

Aug 30 2012 11:16:19:950AM 1120830008 Catherine Fiore 112083008--A short H-mode is followed by a longer I-mode. No sign of a density ITB. We will reduce the gas at .4 s to see if we can keep it out of H-mode.

Aug 30 2012 11:33:31:320AM 1120830009 Catherine Fiore 112083009- I-mode. No sign of a density ITB. We will reduce the magnetic field to 4.3 T

Aug 30 2012 11:48:41:667AM 1120830010 Catherine Fiore 112083010- I-mode. No sign of a density ITB. We will try and keep the density up after the I-mode develops.

Aug 30 2012 12:00:11:487PM 1120830011 Catherine Fiore 112083011-- I-mode. No sign of a density ITB. We will continue to try and keep the density up after the I-mode develops.

Aug 30 2012 12:15:06:937PM 1120830012 Catherine Fiore 112083012- I-mode. No sign of a density ITB. The plasma disrupted at 1.2 s, probable stainless steel entry. The density stayed up better. Repeat.

Aug 30 2012 12:28:42:650PM 1120830013 Catherine Fiore 112083013- I-mode. No sign of a density ITB. We will go back to conditions for shot 10.

Aug 30 2012 01:03:57:693PM 1120830014 Catherine Fiore 112083014- Intermittant I-mode because of rf drop outs.. No sign of a density ITB. Repeat.

Aug 30 2012 01:00:14:190PM 1120830015 Catherine Fiore 1120830015--Steady good I-mode. No sign of a density ITB. We will take a calibration shot for Thomson

Aug 30 2012 01:17:19:197PM 1120830017 Catherine Fiore 1120830017--Plasma remains in L-mode for this shot. We will increase the ICRF power back up to 3MW.

Aug 30 2012 01:40:34:650PM 1120830018 Catherine Fiore 1120830018--Plasma remains in L-mode until very late in the rf pulse. We will increase the ICRF power to 3.5MW.

Aug 30 2012 01:50:59:433PM 1120830019 Catherine Fiore 1120830019--Plasma remains in L-mode until the density drops. We will increase the ICRF power to 3.8MW. to try and get the I-mode earlier.

Aug 30 2012 02:11:41:457PM 1120830020 Catherine Fiore 1120830020--Plasma remains in L-mode until the density drops. Ther was a nice I-mode for 300 ms, but the radiated power has gone up. It was alos pointed out that the magnetic field was a little lower than we had specified, so we are bringing that up to 6.2 T. We will raise the current to 1.1 MW and step up the ICRF power to 4 MW in 2 steps.

Aug 30 2012 02:40:34:710PM 1120830021 Catherine Fiore 1120830021--Plasma remains in L-mode until the density drops. There was a nice I-mode, but we are getting impurities off of the limiter.

Aug 30 2012 02:42:24:940PM 1120830022 Catherine Fiore 1120830022--Plasma remains in L-mode until the density drops. There were several I-modes, but we are getting impurities are getting worse. We will drop the field to 6.1 T to get away from the limiter. Current will be decreased to 1 MW

Aug 30 2012 03:00:16:370PM 1120830023 Catherine Fiore 1120830023--No I-mode, and the plasma disrupts when the rf power is stepped up to 4 MW. We will take a shot at constant 3 MW ICRF power to get data for LBO and Ninja at this field, likely without an I-mode.

Aug 30 2012 03:18:15:773PM 1120830024 Catherine Fiore 1120830024--No I-mode, and the plasma disrupts at 1.2 s. We need to retake this shot to get data for LBO and Ninja at this field, but we are increasing the target density to (hopefully) spare the shoelace antenna.

Aug 30 2012 03:30:06:333PM 1120830025 Catherine Fiore 1120830025--Probably no I-mode unless between 1 and 1.2 s. We are going back to high field side operation for the next shot.

Aug 30 2012 03:46:00:073PM 1120830026 Catherine Fiore 1120830026--Disrupted early, before RF comes on. Moly injection?

Aug 30 2012 04:02:33:297PM 1120830027 Catherine Fiore 1120830027--Disrupted early, before RF comes on. Locked mode?

Aug 30 2012 04:24:28:920PM 1120830028 Catherine Fiore 1120830028--Good long I-mode. No sign of ITB. We will raise the density for the next shot.

Aug 30 2012 04:38:29:233PM 1120830029 Catherine Fiore 1120830029--Good long I-mode, but a short H-mode. No sign of ITB. Next shot will be Thomson calibration with ECE cut-offs

Aug 30 2012 04:44:15:290PM 1120830030 Catherine Fiore 1120830030--Thomson calibration shot, but did not seem to get the cut offs they required. We are returning to the I-mode portion of the program continuing with a density increase to 1.1 nl_04.

Aug 30 2012 04:54:49:840PM 1120830031 Catherine Fiore 1120830031--Fizzle

Aug 30 2012 05:10:58:797PM 1120830032 Catherine Fiore 1120830032--No I-mode, 2 short H-modes, possible ITB development in the H-mode, albeit very short lived.

Physics Operator Comments

Aug 30 2012 09:14:54:457AM 1120830001 Greg Wallace Changes: Load seg 1 from 1120829026 ON. (2012 rev B non-cryo startup)
Load seg 2 from 1120828027 ON. (2012 rev B 1.0 MA LSN) Adjust TF current to 150 kA for 5.4 T. Set Ne puff (PG1) to 0.35-0.5 s.
Leave seg 3 empty.
Load seg 4 from 1120829024 OFF. (2012 rev B 0.8 MA LSN locked mode)

Result: Fizzle. Pressure too high, late breakdown. They physop from yesterday, who shall remain nameless, forgot to change the description of seg 1 to reflect the cryopump status, so the PG4 gas puff was still at 50 ms.

Next shot: Reduce PG4 puff to 20 ms.

Aug 30 2012 09:28:56:640AM 1120830002 Greg Wallace Changes: Reduce PG4 puff to 20 ms.

Result: Plasma. Disruption in rampdown at 0.7 MA.

Next shot: Reduce PG1 puff voltage from 60 to 50. Increase PG5 puff from 100 to 125 ms.

Aug 30 2012 09:38:18:090AM 1120830003 Greg Wallace Changes: Reduce PG1 puff voltage from 60 to 50. Increase PG5 puff from 100 to 125 ms.

Result: Plasma. Disruption in rampdown at 350 kA. I-mode.

Next shot: Locked mode. Turn off seg 2, turn on seg 4.

Aug 30 2012 09:54:00:573AM 1120830004 Greg Wallace Changes: Locked mode. Turn off seg 2, turn on seg 4.

Result: Plasma. Disruption at 0.66 s.

Next shot: Decrease Ip to 850 kA. Increase proportional gain on nl_04 to 5.

Aug 30 2012 10:06:59:483AM 1120830005 Greg Wallace Changes: Decrease Ip to 850 kA. Increase proportional gain on nl_04 to 5.

Result: Locked mode at 0.7 s. Disruption at 0.8 s.

Next shot: Back to non-locked mode. Turn off seg 4, turn on seg 2. Reduce Bt to 4.5 T (TF current to 125 kA). Set TF current limit to 135 kA. Re-enable B side lower (Ne).

Aug 30 2012 10:44:56:237AM 1120830006 Greg Wallace Changes: Back to non-locked mode. Turn off seg 4, turn on seg 2. Reduce Bt to 4.5 T (TF current to 125 kA). Set TF current limit to 135 kA. Re-enable B side lower (Ne).

Result: Dud. OH1 didn't fire. Investigating in the power room. Found a bad fuse. Looks like OH1 was turned off in tree??? Mistakenly lowered TF current limit below that needed in seg 1 and for fizzle detector. NOTE TO SELF: Never set TF current limit below 165 kA!

Next shot: Increase TF current limit to 165 kA.

Aug 30 2012 11:04:37:710AM 1120830007 Greg Wallace Changes: Increase TF current limit to 165 kA.

Result: Plasma through rampdown. 4.53 T. Short ELM-free H-mode. Possibly some ELMs before 1.0 s?

Next shot: Reduce nl_04 demand from 0.8e20 to 0.7e20.

Aug 30 2012 11:14:42:673AM 1120830008 Greg Wallace Changes: Reduce nl_04 demand from 0.8e20 to 0.7e20.

Result: Plasma through rampdown.

Next shot: Reduce nl_04 demand to 0.6e20 before 0.6 s.

Aug 30 2012 11:30:31:143AM 1120830009 Greg Wallace Changes: Reduce nl_04 demand to 0.6e20 before 0.6 s.

Result: Plasma through rampdown.

Next shot: Reduce TF current to 119 kA (4.3 T).

Aug 30 2012 11:43:29:470AM 1120830010 Greg Wallace Changes: Reduce TF current to 119 kA (4.3 T).

Result: Plasma through rampdown.

Next shot: Increase nl_04 demand from .7e20 to .8e20 after 0.6 s.

Aug 30 2012 11:59:31:107AM 1120830011 Greg Wallace Changes: Increase nl_04 demand from .7e20 to .8e20 after 0.6 s.

Result: Plasma through rampdown. RF faulting after 1.0 s.

Next shot: Increase proportional gain on nl_04 feedback from 4 to 5.

Aug 30 2012 12:13:30:963PM 1120830012 Greg Wallace Changes: Increase proportional gain on nl_04 feedback from 4 to 5.

Result: Plasma. Disruption at 1.2 s. Brick?

Next shot: Repeat without the injection. No DPCS changes.

Aug 30 2012 12:25:32:763PM 1120830013 Greg Wallace Changes: Repeat without the injection. No DPCS changes.

Result: Plasma through rampdown.

Next shot: Decrease target nl_04 to 0.7e20 after 0.6 s.

Aug 30 2012 12:36:45:720PM 1120830014 Greg Wallace Changes: Decrease target nl_04 to 0.7e20 after 0.6 s.

Result: Plasma. Disruption in rampdown at 300 kA.

Next shot: No DPCS changes.

Aug 30 2012 12:48:32:867PM 1120830015 Greg Wallace Changes: No DPCS changes.

Result: Plasma. Disruption in rampdown at 300 kA.

Next shot: Ramp nl_04 demand from 0.7e20 at 0.6 s up to 2e20 at 1.5 s.

Aug 30 2012 01:05:08:830PM 1120830016 Greg Wallace Changes: Ramp nl_04 demand from 0.7e20 at 0.6 s up to 2e20 at 1.5 s. (TS ECE cutoff calibration.)

Result: Plasma. Disruption in rampdown at 600 kA.

Next shot: Go to 6.2 T (172 kA). Set limit at 185 kA. Set density constant at nl_04=0.7e20 after 0.6 s.

Aug 30 2012 01:19:22:003PM 1120830017 Greg Wallace Changes: Go to 6.2 T (172 kA). Set limit at 185 kA. Set density constant at nl_04=0.7e20 after 0.6 s.

Result: Plasma. Disruption in rampdown at 400 kA.

Next shot: No DPCS changes.

Aug 30 2012 01:26:02:213PM 1120830018 Greg Wallace Changes: No DPCS changes.

Result: Plasma through rampdown.

Next shot: No DPCS changes. Increase ICRF power.

Aug 30 2012 01:45:29:493PM 1120830019 Greg Wallace Changes: No DPCS changes. Increase ICRF power.

Result: Plasma through rampdown.

Next shot: No DPCS changes. Increase ICRF power.

Aug 30 2012 02:08:54:600PM 1120830020 Greg Wallace Changes: No DPCS changes. Increase ICRF power.

Result: Plasma. Disruption in rampdown at 400 kA.

Next shot: Increase Ip to 1.1 MA. Step up ICRF power to avoid early W injections. Increase TF to 174.8 kA.

Aug 30 2012 02:27:05:257PM 1120830021 Greg Wallace Changes: Increase Ip to 1.1 MA. Step up ICRF power to avoid early W injections. Increase TF to 174.8 kA.

Result: Plasma. Disruption in rampdown at 300 kA.

Next shot: Adjust for slight droop in TF. (End point was at 174 kA, not 174.8 kA.)

Aug 30 2012 02:43:17:637PM 1120830022 Greg Wallace Changes: Adjust for slight droop in TF. (End point was at 174 kA, not 174.8 kA.)

Result: Plasma through rampdown.

Next shot: Decrease TF to 6.1 T (172 kA) and Ip to 1.0 MA.

Aug 30 2012 02:57:06:460PM 1120830023 Greg Wallace Changes: Decrease TF to 6.1 T (172 kA) and Ip to 1.0 MA.

Result: Disruption at 0.86 s. Too much ICRF power?

Next shot: No DPCS changes. Cap ICRF power at 3.0 MW.

Aug 30 2012 03:13:27:650PM 1120830024 Greg Wallace Changes: No DPCS changes. Cap ICRF power at 3.0 MW.

Result: Disruption at 1.19 s. Looks like injections from shoelace antenna.

Next shot: Increase nl_04 demand to 0.9e20 after 0.6 s.

Aug 30 2012 03:33:59:590PM 1120830025 Greg Wallace Changes: Increase nl_04 demand to 0.9e20 after 0.6 s.

Result: Plasma.

Next shot: Decrease TF to 4.3 T (120.8 kA).

Aug 30 2012 03:48:44:573PM 1120830026 Greg Wallace Changes: Decrease TF to 4.3 T (120.8 kA).

Result: Disruption at 0.58 s.

Next shot: Repeat without disruption.

Aug 30 2012 04:05:05:743PM 1120830027 Greg Wallace Changes: Repeat without disruption.

Result: Disruption at 0.5 s. Locked mode the cause?

Next shot: Increase nl_04 demand early from .6e20 to .7e20.

Aug 30 2012 04:20:37:423PM 1120830028 Greg Wallace Changes: Increase nl_04 demand early from .6e20 to .7e20.

Result: Plasma through rampdown.

Next shot: Increase nl_04 demand to 1e20 after 0.6 s.

Aug 30 2012 04:34:41:483PM 1120830029 Greg Wallace Changes: Increase nl_04 demand to 1e20 after 0.6 s.

Result: Plasma through rampdown.

Next shot: ECE cutoff shot for TS. Density ramp from 1e20 to 2e20.

Aug 30 2012 04:53:27:867PM 1120830030 Greg Wallace Changes: ECE cutoff shot for TS. Density ramp from 1e20 to 2e20.

Result: Plasma. Disruption at start of rampdown.

Next shot: Re-enable Ne puff (B-side lower). Change density after 0.6 s to 1.1e20.

Aug 30 2012 05:05:45:487PM 1120830031 Greg Wallace Changes: Re-enable Ne puff (B-side lower). Change density after 0.6 s to 1.1e20.

Result: Post disruption fizzle.

Next shot: Repeat.

Aug 30 2012 05:06:11:267PM 1120830032 Greg Wallace Changes: Repeat.

Result: Plasma. Last shot of the day.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:04:46:600AM Plasma Ok

2 09:17:11:027AM Plasma Ok

3 09:30:10:053AM Plasma Ok

4 09:42:48:780AM Plasma Ok

5 09:55:48:233AM Plasma Ok

6 10:09:32:460AM Plasma Bad oh force fault

7 10:51:22:357AM Plasma Ok

8 11:04:58:717AM Plasma Ok

9 11:17:31:440AM Plasma Ok

10 11:30:58:580AM Plasma Ok

11 11:49:02:703AM Plasma Ok

12 12:01:35:147PM Plasma Ok

13 12:14:10:330PM Plasma Ok

14 12:27:47:437PM Plasma Ok

15 12:40:27:027PM Plasma Ok

16 12:52:57:607PM Plasma Ok

17 01:06:58:017PM Plasma Ok

18 01:20:21:630PM Plasma Ok

19 01:38:03:423PM Plasma Ok

20 01:56:15:727PM Plasma Ok

21 02:14:16:320PM Plasma Ok

22 02:32:02:360PM Plasma Ok

23 02:49:26:847PM Plasma Ok

24 03:03:47:983PM Plasma Ok

25 03:18:19:030PM Plasma Ok

26 03:35:32:693PM Plasma Ok

27 03:56:06:973PM Plasma Ok

28 04:10:56:010PM Plasma Ok

29 04:25:36:563PM Plasma Ok

30 04:38:36:980PM Plasma Ok

31 04:50:59:800PM Plasma Ok

32 05:03:25:470PM Plasma Ok

System Availability

Aug 30 2012 09:04:27:890AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD no secured - tagged out Jun 2 2008 11:03:58:433AM (sears) Joe Snipes Active MHD Antenna golfit
BES yes BES system is online Nov 22 2011 02:21:12:050PM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan
Bolometers yes Midplane diodes functioning properly. Midplane bolometers working and calibrated. DIV bolometers installed but not yet toaster calibrated Apr 20 2012 09:57:29:520AM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization yes Jun 15 2012 05:02:46:313PM (dekow) Jim Irby Boronization dekow,irby
CECE yes The system is currently operational for Te tilde measurement. Talk to Choongki about the current configuration Jul 3 2012 04:38:00:317PM (nthoward) Anne White Correlation ECE nthoward,sck83,whitea
CNPA yes Multiple channel CNPA available, no safety risk for in-vessel access Apr 14 2011 12:01:59:693PM (parker) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor yes Jun 15 2012 05:02:31:550PM (dekow) Brian LaBombard Upper Divertor Cryopump dekow,irby,labombard
CXRS yes core-CXRS system is online Nov 22 2011 02:21:22:280PM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,liao,rachmcd,rowan
CXRS edge yes Michael CHurchill has primary responsibility at the moment Apr 19 2011 11:44:46:247AM (blip) Bruce Lipshultz Measurement of CXR light in the pedestal region at both the high- and low-field sides blip,rmchurch
D Alpha yes \ha2_bright is available; \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 is not available Jul 1 2009 09:45:41:090AM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa no system is is installed and aligned, but not functional (appears to be a broken cable) Dec 5 2011 02:41:42:867PM (marmar) Earl Marmar Visible Bremsstrahlung Imaging marmar
Disruption Mitigation yes two gas jet valves active as of Feb 2012 May 15 2012 10:09:23:597AM (granetz) Robert Granetz Gas Jet granetz,whyte
Divertor IR no Mar 6 2007 10:50:41:677AM Glen Wurden Divertor IR Digital Video gwurden,terry
Divertor IR Spectroscopy no Mar 6 2007 10:51:39:897AM Glen Wurden Divertor IR Spectroscopy gwurden,terry
DMBolo AXUV diodes yes Diodes are taking usable data. Not all post-processing code is working yet. Feb 1 2012 01:24:23:953PM (golynyk) Geoff Olynyk Set of six AXUV diodes in a toroidal array of midplane wall boxes. golynyk,granetz,mlreinke,whyte
DNB yes "The beam could break at any moment." May 15 2012 10:09:52:470AM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,mochung
ECDC yes Apr 26 2012 03:23:19:057PM (dekow) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer
FRC-ECE yes FRC-ECE is online May 14 2012 11:53:01:693AM (bespam) Perry Phillips Heterodyne ECE-32 channels bespam,liao,phillips,rowan,whitea
FTCI yes System Operational May 14 2012 11:50:45:590AM (irby) Jim Irby Fast two-color interferometer irby
G-Side Ratiomatic yes Installed April 25,2012. New controller installed 5/29/2012 Jun 7 2012 10:40:00:957AM (toland) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
Glow Discharge no HV cables disconnected and power supplies off. Electrical plugs have been disconnected, capped and red tagged. Mar 5 2012 10:21:53:460AM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby
GPC yes Operational Apr 27 2012 07:41:46:907AM (hubbard) Amanda Hubbard ECE Polychromater hubbard
GPC2 yes Operational Apr 27 2012 07:42:03:317AM (hubbard) Amanda Hubbard ECE Polychromater hubbard
GPI yes The Xpt-view, the midplane-view cameras are operational. The innerwall GPI (coupled to the fast-diodes) is available. Jul 1 2009 09:45:50:933AM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes system is functional and taking data Dec 5 2011 02:42:29:857PM (marmar) Earl Marmar H/D Ratio marmar
HEAT yes Apr 26 2012 03:23:49:607PM (dekow) Gary Dekow - Machine Heaters - burke,dekow
Hirex Jr yes Hirex-Jr has been installed Jun 28 2010 03:36:33:420PM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr yes Installed and aligned. Will be available for Ti/Vr profiles after focusing tests and locked modes are taken. Dec 6 2011 08:21:02:453AM (ypodpaly) John Rice High Resolution X-Ray cgao,ldelgado,rice,ypodpaly
HXR yes 32 Channels operational,, no safety risk for in-vessel access Apr 14 2011 12:05:24:810PM (parker) Ron Parker Hard X-Ray Array faust,parker,schmidt
ICRF D-Antenna yes May 31 2012 09:20:06:827AM (wukitch) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes May 31 2012 09:19:57:640AM (wukitch) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes May 31 2012 09:19:47:443AM (wukitch) Steve Wukitch J-port antenna wukitch,ylin
Impurity Spectroscopy yes Being upgraded with better optics and new spectrographs. Dan Miller has primary responsibility. Apr 19 2011 11:46:02:193AM (blip) Bruce Lipshultz Measurement of recycling light and impurity source rates at multiple surfaces around the tokamak blip,miller
Laser Blow-Off yes Pumped Down, Laser has not yet been tested but otherwise operational May 14 2012 04:31:17:037PM (nthoward) Martin Greenwald Impurity Injection System g,nthoward
Lower Hybrid yes LH is now available for plasma operation up to ~900 kW net power. Jul 3 2012 02:50:00:693PM (wallaceg) Ron Parker Lower Hybrid dterry,parker,wallaceg
Lower Hybrid Reflectometer no off Apr 15 2011 08:24:27:930AM (dominguez) Arturo Dominguez Lower Hybrid Reflectometer dominguez,marmar,parker,sgbaek
LoWEUS yes LoWEUS viewing the 10-30 nm region, spectral brightness vs. lambda and time are being stored in tree. Apr 20 2012 10:43:34:077AM (mlreinke) Matthew L. Reinke Long Wavelength Extreme Ultraviolet Spectrometer markchil,mlreinke
LPI no Beam line removed May 30 2008 02:09:12:833PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha no Midplane Lyman-a not functioning. New B-PORT Lyman (BPLY) still being debugged. Jul 12 2012 08:52:28:233AM (mlreinke) Matt Reinke Lyman alpha cameras faustian,labombard,mlreinke
Magnetics yes Dec 1 2011 11:51:51:970AM (g) Robert Granetz Bp coils and flux loops for equilibrium control granetz,wolfe
McPherson no McPherson under vacuum but is not run on a day-to-day basis. Can be requested if desired. LoWEUS has taken over as the primary Mo monitor. Jul 12 2012 08:53:14:937AM (mlreinke) Jim Terry VUV Spectrometer markchil,mlreinke,terry
Michelson yes Vacuum 3-4e-8 T. Starting with Michelson at reduced speed. Apr 27 2012 07:42:41:960AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes Dec 2 2011 12:27:47:163PM (toland) Brian LaBombard Baratron pressure gauges labombard,toland
MLP yes Operational. Connected to A-port probe system May 10 2012 08:40:19:910AM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE yes 2/29/2012 MSE operational. No HV or vacuum safety issues Feb 29 2012 12:26:13:863PM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Voltage is on for He3 detectors on J port. Remaining voltages will be turned on for the first run. Apr 23 2012 09:31:22:063AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes All detectors Powered On --- Waiting for neutrons for calibration Nov 22 2011 01:05:24:380PM (irby) Jim Irby X-Ray/Neutron Detectors at K-Hor irby
NINJA yes C-bottom and new F-bottom system ready. Dec 2 2011 12:28:44:843PM (toland) Brian LaBombard NINJA gas puff labombard,terry,toland
PCI yes Operational. Jul 10 2012 07:08:06:883PM (ntsujii) Miklos Porkolab Phase Contrast Imaging emd,ennever,ntsujii,porkolab
Penning Gauges yes HV power supplies turned ON in INIT, off in RECOOL May 10 2012 08:41:03:000AM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Jul 1 2009 09:46:29:543AM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter yes 3 chords operational but with high noise level Jan 6 2012 04:22:20:903PM (irby) Jim Irby C-Mod Polarimeter irby
Power - Alternator Air Switch yes Apr 26 2012 03:24:21:607PM (dekow) Gary Dekow Alternator to Power Room Power Supply Connection cochran,dekow,dterry,irby
Power - PEI yes Apr 26 2012 03:24:41:250PM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby
Power - TMX yes Apr 26 2012 03:24:57:153PM (dekow) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby
Power Systems yes Apr 26 2012 03:25:14:497PM (dekow) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby
Probe Array - ISD yes Operational. Some dead probes. May 10 2012 08:41:58:120AM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes Operational. 4 out of 6 probes working. May 10 2012 08:41:40:557AM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Operational. May 10 2012 08:42:13:733AM (labombard) Brian LaBombard Outer Lower Divertor Probe Array (F and J) labombard
Probe Array - UDIV yes Operational. Some dead probes. May 10 2012 08:42:32:663AM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes On 1120608, the high frequency channels: 112, 140 and the variable, have been disconnected for some troubleshooting. All other channels are connected Jun 14 2012 11:28:59:603AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Operational. A variety of probe heads are ready for use. May 10 2012 08:43:10:937AM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Operational. May 10 2012 08:43:24:887AM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP no Not functioning. Probe tips are melted. Repair not performed during break. May 10 2012 08:44:43:137AM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
Shoelace Antenna yes Operational May 10 2012 08:45:08:320AM (labombard) Brian LaBombard High-k active MHD antenna, for QCM, WCM studies golfit,labombard
SOL reflectometer yes c-port (top, middle, bottom) and h-port available. Only 1 of 4 locations can be used for each discharge May 1 2012 04:54:58:820PM (cornwall) Cornwall Lau SOL reflectometer cornwall,wukitch,ylin
Sparker yes Sparker Power Supply powered up. Connected at K port using red cable 4/23/12 9:25AM Apr 23 2012 12:06:10:983PM (parkin) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin
Surface Science Station yes SSS is under vacuum and fully available. Jul 3 2012 02:46:59:753PM (ochoukov) Bruce Lipschultz Radially scanning probe located on K-port blip,ochoukov
TCI yes TCI lasers in operation May 14 2012 11:51:18:700AM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes Operating with both lasers, density calibration ongoing. Jul 19 2012 10:20:09:220AM (jrwalk) Jerry Hughes Core Thomson scattering jrwalk,jwhughes,yma
TS - Edge yes Operating with both lasers, density calibration ongoing. Jul 19 2012 10:20:28:323AM (jrwalk) Jerry Hughes Millimeter resolution edge Thomson scattering jrwalk,jwhughes,yma
Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58:35:493AM (agraf) Alex Graf Visible Spectrometer agraf
XEUS yes XEUS viewing the 1-6 nm region, spectral brightness vs. lambda and time are being stored in tree. Apr 20 2012 10:43:43:107AM (mlreinke) Matt Reinke X-ray Extended Ultraviolet Spectrometer markchil,mlreinke
XTOMO yes ARRAY1->5 available. Specific channels on various arrays display issues. Apr 20 2012 05:36:28:523PM (faustian) Robert Granetz X-Ray Tomography faustian,granetz,mlreinke

Session Leader Comments
Aug 30 2012 09:16:33:397AM	1120830001	Catherine Fiore	112083001--pressure issue from programming error. Fizzle
Aug 30 2012 09:29:20:340AM	1120830002	Catherine Fiore	112083002--H-mode, probably too high of a density. We will try to repeat.
Aug 30 2012 09:38:16:897AM	1120830003	Catherine Fiore	112083003--Nice I-mode. Hirex has good data. We will proceed with the run plan and try to get a locked mode.
Aug 30 2012 09:50:37:230AM	1120830004	Catherine Fiore	112083004--Lock mode was obtained, but was not judged to be long enough by the Hirex group. We will make another attempt.
Aug 30 2012 10:11:34:847AM	1120830005	Catherine Fiore	112083005--Lock mode was obtained. We will proceed with the high field side off-axis ICRF ITB in I-mode attempt
Aug 30 2012 10:12:01:617AM	1120830005	Catherine Fiore	112083005--Lock mode was obtained. We will proceed with the high field side off-axis ICRF ITB in I-mode attempt
Aug 30 2012 10:12:35:747AM	1120830006	Catherine Fiore	112083006--No plasma, power supply issue
Aug 30 2012 11:06:28:417AM	1120830007	Catherine Fiore	112083007--Elmy I mode? It went into H mode eventually, so we will reduce the density slightly. No sign of an ITB
Aug 30 2012 11:16:19:950AM	1120830008	Catherine Fiore	112083008--A short H-mode is followed by a longer I-mode. No sign of a density ITB. We will reduce the gas at .4 s to see if we can keep it out of H-mode.
Aug 30 2012 11:33:31:320AM	1120830009	Catherine Fiore	112083009- I-mode. No sign of a density ITB. We will reduce the magnetic field to 4.3 T
Aug 30 2012 11:48:41:667AM	1120830010	Catherine Fiore	112083010- I-mode. No sign of a density ITB. We will try and keep the density up after the I-mode develops.
Aug 30 2012 12:00:11:487PM	1120830011	Catherine Fiore	112083011-- I-mode. No sign of a density ITB. We will continue to try and keep the density up after the I-mode develops.
Aug 30 2012 12:15:06:937PM	1120830012	Catherine Fiore	112083012- I-mode. No sign of a density ITB. The plasma disrupted at 1.2 s, probable stainless steel entry. The density stayed up better. Repeat.
Aug 30 2012 12:28:42:650PM	1120830013	Catherine Fiore	112083013- I-mode. No sign of a density ITB. We will go back to conditions for shot 10.
Aug 30 2012 01:03:57:693PM	1120830014	Catherine Fiore	112083014- Intermittant I-mode because of rf drop outs.. No sign of a density ITB. Repeat.
Aug 30 2012 01:00:14:190PM	1120830015	Catherine Fiore	1120830015--Steady good I-mode. No sign of a density ITB. We will take a calibration shot for Thomson
Aug 30 2012 01:17:19:197PM	1120830017	Catherine Fiore	1120830017--Plasma remains in L-mode for this shot. We will increase the ICRF power back up to 3MW.
Aug 30 2012 01:40:34:650PM	1120830018	Catherine Fiore	1120830018--Plasma remains in L-mode until very late in the rf pulse. We will increase the ICRF power to 3.5MW.
Aug 30 2012 01:50:59:433PM	1120830019	Catherine Fiore	1120830019--Plasma remains in L-mode until the density drops. We will increase the ICRF power to 3.8MW. to try and get the I-mode earlier.
Aug 30 2012 02:11:41:457PM	1120830020	Catherine Fiore	1120830020--Plasma remains in L-mode until the density drops. Ther was a nice I-mode for 300 ms, but the radiated power has gone up. It was alos pointed out that the magnetic field was a little lower than we had specified, so we are bringing that up to 6.2 T. We will raise the current to 1.1 MW and step up the ICRF power to 4 MW in 2 steps.
Aug 30 2012 02:40:34:710PM	1120830021	Catherine Fiore	1120830021--Plasma remains in L-mode until the density drops. There was a nice I-mode, but we are getting impurities off of the limiter.
Aug 30 2012 02:42:24:940PM	1120830022	Catherine Fiore	1120830022--Plasma remains in L-mode until the density drops. There were several I-modes, but we are getting impurities are getting worse. We will drop the field to 6.1 T to get away from the limiter. Current will be decreased to 1 MW
Aug 30 2012 03:00:16:370PM	1120830023	Catherine Fiore	1120830023--No I-mode, and the plasma disrupts when the rf power is stepped up to 4 MW. We will take a shot at constant 3 MW ICRF power to get data for LBO and Ninja at this field, likely without an I-mode.
Aug 30 2012 03:18:15:773PM	1120830024	Catherine Fiore	1120830024--No I-mode, and the plasma disrupts at 1.2 s. We need to retake this shot to get data for LBO and Ninja at this field, but we are increasing the target density to (hopefully) spare the shoelace antenna.
Aug 30 2012 03:30:06:333PM	1120830025	Catherine Fiore	1120830025--Probably no I-mode unless between 1 and 1.2 s. We are going back to high field side operation for the next shot.
Aug 30 2012 03:46:00:073PM	1120830026	Catherine Fiore	1120830026--Disrupted early, before RF comes on. Moly injection?
Aug 30 2012 04:02:33:297PM	1120830027	Catherine Fiore	1120830027--Disrupted early, before RF comes on. Locked mode?
Aug 30 2012 04:24:28:920PM	1120830028	Catherine Fiore	1120830028--Good long I-mode. No sign of ITB. We will raise the density for the next shot.
Aug 30 2012 04:38:29:233PM	1120830029	Catherine Fiore	1120830029--Good long I-mode, but a short H-mode. No sign of ITB. Next shot will be Thomson calibration with ECE cut-offs
Aug 30 2012 04:44:15:290PM	1120830030	Catherine Fiore	1120830030--Thomson calibration shot, but did not seem to get the cut offs they required. We are returning to the I-mode portion of the program continuing with a density increase to 1.1 nl_04.
Aug 30 2012 04:54:49:840PM	1120830031	Catherine Fiore	1120830031--Fizzle
Aug 30 2012 05:10:58:797PM	1120830032	Catherine Fiore	1120830032--No I-mode, 2 short H-modes, possible ITB development in the H-mode, albeit very short lived.

Physics Operator Comments
Aug 30 2012 09:14:54:457AM	1120830001	Greg Wallace	Changes: Load seg 1 from 1120829026 ON. (2012 rev B non-cryo startup) Load seg 2 from 1120828027 ON. (2012 rev B 1.0 MA LSN) Adjust TF current to 150 kA for 5.4 T. Set Ne puff (PG1) to 0.35-0.5 s. Leave seg 3 empty. Load seg 4 from 1120829024 OFF. (2012 rev B 0.8 MA LSN locked mode) Result: Fizzle. Pressure too high, late breakdown. They physop from yesterday, who shall remain nameless, forgot to change the description of seg 1 to reflect the cryopump status, so the PG4 gas puff was still at 50 ms. Next shot: Reduce PG4 puff to 20 ms.
Aug 30 2012 09:28:56:640AM	1120830002	Greg Wallace	Changes: Reduce PG4 puff to 20 ms. Result: Plasma. Disruption in rampdown at 0.7 MA. Next shot: Reduce PG1 puff voltage from 60 to 50. Increase PG5 puff from 100 to 125 ms.
Aug 30 2012 09:38:18:090AM	1120830003	Greg Wallace	Changes: Reduce PG1 puff voltage from 60 to 50. Increase PG5 puff from 100 to 125 ms. Result: Plasma. Disruption in rampdown at 350 kA. I-mode. Next shot: Locked mode. Turn off seg 2, turn on seg 4.
Aug 30 2012 09:54:00:573AM	1120830004	Greg Wallace	Changes: Locked mode. Turn off seg 2, turn on seg 4. Result: Plasma. Disruption at 0.66 s. Next shot: Decrease Ip to 850 kA. Increase proportional gain on nl_04 to 5.
Aug 30 2012 10:06:59:483AM	1120830005	Greg Wallace	Changes: Decrease Ip to 850 kA. Increase proportional gain on nl_04 to 5. Result: Locked mode at 0.7 s. Disruption at 0.8 s. Next shot: Back to non-locked mode. Turn off seg 4, turn on seg 2. Reduce Bt to 4.5 T (TF current to 125 kA). Set TF current limit to 135 kA. Re-enable B side lower (Ne).
Aug 30 2012 10:44:56:237AM	1120830006	Greg Wallace	Changes: Back to non-locked mode. Turn off seg 4, turn on seg 2. Reduce Bt to 4.5 T (TF current to 125 kA). Set TF current limit to 135 kA. Re-enable B side lower (Ne). Result: Dud. OH1 didn't fire. Investigating in the power room. Found a bad fuse. Looks like OH1 was turned off in tree??? Mistakenly lowered TF current limit below that needed in seg 1 and for fizzle detector. NOTE TO SELF: Never set TF current limit below 165 kA! Next shot: Increase TF current limit to 165 kA.
Aug 30 2012 11:04:37:710AM	1120830007	Greg Wallace	Changes: Increase TF current limit to 165 kA. Result: Plasma through rampdown. 4.53 T. Short ELM-free H-mode. Possibly some ELMs before 1.0 s? Next shot: Reduce nl_04 demand from 0.8e20 to 0.7e20.
Aug 30 2012 11:14:42:673AM	1120830008	Greg Wallace	Changes: Reduce nl_04 demand from 0.8e20 to 0.7e20. Result: Plasma through rampdown. Next shot: Reduce nl_04 demand to 0.6e20 before 0.6 s.
Aug 30 2012 11:30:31:143AM	1120830009	Greg Wallace	Changes: Reduce nl_04 demand to 0.6e20 before 0.6 s. Result: Plasma through rampdown. Next shot: Reduce TF current to 119 kA (4.3 T).
Aug 30 2012 11:43:29:470AM	1120830010	Greg Wallace	Changes: Reduce TF current to 119 kA (4.3 T). Result: Plasma through rampdown. Next shot: Increase nl_04 demand from .7e20 to .8e20 after 0.6 s.
Aug 30 2012 11:59:31:107AM	1120830011	Greg Wallace	Changes: Increase nl_04 demand from .7e20 to .8e20 after 0.6 s. Result: Plasma through rampdown. RF faulting after 1.0 s. Next shot: Increase proportional gain on nl_04 feedback from 4 to 5.
Aug 30 2012 12:13:30:963PM	1120830012	Greg Wallace	Changes: Increase proportional gain on nl_04 feedback from 4 to 5. Result: Plasma. Disruption at 1.2 s. Brick? Next shot: Repeat without the injection. No DPCS changes.
Aug 30 2012 12:25:32:763PM	1120830013	Greg Wallace	Changes: Repeat without the injection. No DPCS changes. Result: Plasma through rampdown. Next shot: Decrease target nl_04 to 0.7e20 after 0.6 s.
Aug 30 2012 12:36:45:720PM	1120830014	Greg Wallace	Changes: Decrease target nl_04 to 0.7e20 after 0.6 s. Result: Plasma. Disruption in rampdown at 300 kA. Next shot: No DPCS changes.
Aug 30 2012 12:48:32:867PM	1120830015	Greg Wallace	Changes: No DPCS changes. Result: Plasma. Disruption in rampdown at 300 kA. Next shot: Ramp nl_04 demand from 0.7e20 at 0.6 s up to 2e20 at 1.5 s.
Aug 30 2012 01:05:08:830PM	1120830016	Greg Wallace	Changes: Ramp nl_04 demand from 0.7e20 at 0.6 s up to 2e20 at 1.5 s. (TS ECE cutoff calibration.) Result: Plasma. Disruption in rampdown at 600 kA. Next shot: Go to 6.2 T (172 kA). Set limit at 185 kA. Set density constant at nl_04=0.7e20 after 0.6 s.
Aug 30 2012 01:19:22:003PM	1120830017	Greg Wallace	Changes: Go to 6.2 T (172 kA). Set limit at 185 kA. Set density constant at nl_04=0.7e20 after 0.6 s. Result: Plasma. Disruption in rampdown at 400 kA. Next shot: No DPCS changes.
Aug 30 2012 01:26:02:213PM	1120830018	Greg Wallace	Changes: No DPCS changes. Result: Plasma through rampdown. Next shot: No DPCS changes. Increase ICRF power.
Aug 30 2012 01:45:29:493PM	1120830019	Greg Wallace	Changes: No DPCS changes. Increase ICRF power. Result: Plasma through rampdown. Next shot: No DPCS changes. Increase ICRF power.
Aug 30 2012 02:08:54:600PM	1120830020	Greg Wallace	Changes: No DPCS changes. Increase ICRF power. Result: Plasma. Disruption in rampdown at 400 kA. Next shot: Increase Ip to 1.1 MA. Step up ICRF power to avoid early W injections. Increase TF to 174.8 kA.
Aug 30 2012 02:27:05:257PM	1120830021	Greg Wallace	Changes: Increase Ip to 1.1 MA. Step up ICRF power to avoid early W injections. Increase TF to 174.8 kA. Result: Plasma. Disruption in rampdown at 300 kA. Next shot: Adjust for slight droop in TF. (End point was at 174 kA, not 174.8 kA.)
Aug 30 2012 02:43:17:637PM	1120830022	Greg Wallace	Changes: Adjust for slight droop in TF. (End point was at 174 kA, not 174.8 kA.) Result: Plasma through rampdown. Next shot: Decrease TF to 6.1 T (172 kA) and Ip to 1.0 MA.
Aug 30 2012 02:57:06:460PM	1120830023	Greg Wallace	Changes: Decrease TF to 6.1 T (172 kA) and Ip to 1.0 MA. Result: Disruption at 0.86 s. Too much ICRF power? Next shot: No DPCS changes. Cap ICRF power at 3.0 MW.
Aug 30 2012 03:13:27:650PM	1120830024	Greg Wallace	Changes: No DPCS changes. Cap ICRF power at 3.0 MW. Result: Disruption at 1.19 s. Looks like injections from shoelace antenna. Next shot: Increase nl_04 demand to 0.9e20 after 0.6 s.
Aug 30 2012 03:33:59:590PM	1120830025	Greg Wallace	Changes: Increase nl_04 demand to 0.9e20 after 0.6 s. Result: Plasma. Next shot: Decrease TF to 4.3 T (120.8 kA).
Aug 30 2012 03:48:44:573PM	1120830026	Greg Wallace	Changes: Decrease TF to 4.3 T (120.8 kA). Result: Disruption at 0.58 s. Next shot: Repeat without disruption.
Aug 30 2012 04:05:05:743PM	1120830027	Greg Wallace	Changes: Repeat without disruption. Result: Disruption at 0.5 s. Locked mode the cause? Next shot: Increase nl_04 demand early from .6e20 to .7e20.
Aug 30 2012 04:20:37:423PM	1120830028	Greg Wallace	Changes: Increase nl_04 demand early from .6e20 to .7e20. Result: Plasma through rampdown. Next shot: Increase nl_04 demand to 1e20 after 0.6 s.
Aug 30 2012 04:34:41:483PM	1120830029	Greg Wallace	Changes: Increase nl_04 demand to 1e20 after 0.6 s. Result: Plasma through rampdown. Next shot: ECE cutoff shot for TS. Density ramp from 1e20 to 2e20.
Aug 30 2012 04:53:27:867PM	1120830030	Greg Wallace	Changes: ECE cutoff shot for TS. Density ramp from 1e20 to 2e20. Result: Plasma. Disruption at start of rampdown. Next shot: Re-enable Ne puff (B-side lower). Change density after 0.6 s to 1.1e20.
Aug 30 2012 05:05:45:487PM	1120830031	Greg Wallace	Changes: Re-enable Ne puff (B-side lower). Change density after 0.6 s to 1.1e20. Result: Post disruption fizzle. Next shot: Repeat.
Aug 30 2012 05:06:11:267PM	1120830032	Greg Wallace	Changes: Repeat. Result: Plasma. Last shot of the day.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:04:46:600AM	Plasma	Ok
2	09:17:11:027AM	Plasma	Ok
3	09:30:10:053AM	Plasma	Ok
4	09:42:48:780AM	Plasma	Ok
5	09:55:48:233AM	Plasma	Ok
6	10:09:32:460AM	Plasma	Bad	oh force fault
7	10:51:22:357AM	Plasma	Ok
8	11:04:58:717AM	Plasma	Ok
9	11:17:31:440AM	Plasma	Ok
10	11:30:58:580AM	Plasma	Ok
11	11:49:02:703AM	Plasma	Ok
12	12:01:35:147PM	Plasma	Ok
13	12:14:10:330PM	Plasma	Ok
14	12:27:47:437PM	Plasma	Ok
15	12:40:27:027PM	Plasma	Ok
16	12:52:57:607PM	Plasma	Ok
17	01:06:58:017PM	Plasma	Ok
18	01:20:21:630PM	Plasma	Ok
19	01:38:03:423PM	Plasma	Ok
20	01:56:15:727PM	Plasma	Ok
21	02:14:16:320PM	Plasma	Ok
22	02:32:02:360PM	Plasma	Ok
23	02:49:26:847PM	Plasma	Ok
24	03:03:47:983PM	Plasma	Ok
25	03:18:19:030PM	Plasma	Ok
26	03:35:32:693PM	Plasma	Ok
27	03:56:06:973PM	Plasma	Ok
28	04:10:56:010PM	Plasma	Ok
29	04:25:36:563PM	Plasma	Ok
30	04:38:36:980PM	Plasma	Ok
31	04:50:59:800PM	Plasma	Ok
32	05:03:25:470PM	Plasma	Ok