Alcator C-Mod Run 1101201 Information

Miniproposals

Miniproposal: 553

Date Filed: 4/30/2008

Title: Creation of revearsed sheer current profile using LH on low Ip plasmas

First Author: Syunichi Shiraiwa

Session Leader: Syunichi Shiraiwa (shots 19-34)

Miniproposal: 612

Date Filed: 7/21/2010

Title: Expanded exploration of LHCD Density Limit

First Author: Greg Wallace

Session Leader: Greg Wallace (shots 1-18)

Operators
Session leader(s):	Greg Wallace,Syunichi Shiraiwa
Physics operator(s):	Robert Granetz
Engineering operator(s):	Andy Pfeiffer,Bill Parkin,Bill Byford

Engineering Operator Run Comment
MP553 MP612 Session leaders: S. Shiraiwa and G. Wallace Physics operator

Session Leader Plans

Entered: Nov 30 2010 05:27:40:780PM

Author: Syunichi Shiraiwa

SL plan for 1101201 (AM) : AM and PM may be swapped

MP553 - Creation of revearsed sheer current profile using LH on low Ip plasmas

Required systems: LH, ICRF, DNB, MSE, HXR, cryopump

This run is to reproduce the transport barrier which we obtained 11/19
during LHCD and to try several ideas to find a nob to optimize the discharge.

Reference shot : 1101119006

Shot plan
1) Shot 1 - 5 : Repeat the reference discharge with different DNB timing
for MSE. If the ITB is successfully obtained, we try Ar on and Ar off discharges
to see the effect of puff on the core impurity accumulation.
Also, we may put ICRF after LHCD pulse in some discharge.

2) Shot 6-9 : try 100 deg. phasing of LHCD. 4 shot is to optimize the coupling
and the increase the LHCD power.

3) Shot 10-15 : Launch ICRF power from J-port antenna. Assuming that
transition happens somewhat reproducible timing, we try to start ICRF
during or slightly before the transition.

4) If the run goes smoothly, we try slightly different density to move the
cut-off layer of 88 GHz reflectometer (cut-off density is about 9e19, which
is slightly higher than the reference discharge)

------Request for LH operation------
LH Launcher position with repect to the limiters: 0.1 mm

LH Start time: 0.9 sec
LH Stop time: 1.4 sec
Phasing: 90 deg
Net Power desired: 1MW
LH Run Duration: Full day
Waveform description: Standard

Entered: Nov 30 2010 06:52:36:347PM

Author: Greg Wallace

SL plan for 1101201 (AM)
MP612: Expanded exploration of LHCD Density Limit

Required systems: LH, DNB, MSE, HXR, cryopump.

LH setup: 90 deg phasing, 80-160 kW/klystron, launcher 0.1 mm behind limiter, pulse length 0.8-1.3 s.

Reference shot: 1100820007

1) Establish double null with large inner gap at ~600 kW LH, nl_04=4.5e19. (1-2 shots)

2) Scan inner gap during LH from nominal value (~1.25 cm) to zero at nl_04=4.5e19. Scan of inner gap will be dynamic during LH pulse. Outer gap should be ~constant during inner gap scan. (2-3 shots)

3) Increase density to nl_04=7e19 without transition to H-mode. Adjust outer gap as necessary to prevent ionization at LH grill. (2-4 shots)

4) Repeat of step 2 at higher density. Scan inner gap during LH from nominal value (~1.25 cm) to zero at nl_04=7e19. Scan of inner gap will be dynamic during LH pulse. Outer gap should be ~constant during inner gap scan. (2-3 shots)

5) Maintain steady inner gap of 0.3 cm. Ramp density from 4.5-8e19 during LH. (2-3 shots)

6) If time allows, increase LH power to maximum available (~1 MW) to see how much current can be driven at high density in double null with small inner gap.

Physics Operators Plans

Entered: Nov 30 2010 04:20:53:980PM

Author: Robert Granetz

Engineering setup for Wednesday 2010/12/01 MP553 - Creation of revearsed sheer current profile using LH on low Ip plasmas MP612 - Expanded exploration of LHCD Density Limit Session leaders: S. Shiraiwa and G. Wallace Physics operator: R. Granetz Overnight: standard ECDC and 60 C bake. Run will start at 09:00 and end at 17:00. Power systems as on: 1101119006 (0.45 MA, 5.4 T, 0.35e20 m-2 target, USN, cryopump) A-coil configuration: +Dtop -Dbot -Jtop +Jbot; Hybrid enabled (standard configuration) Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar 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 NINJA with 10 psi D2 Enable the following gate valves and shutters, assuming no vacuum problems: ECE, VUV, Z-bolo, HIREX-Sr, B-spectrometer GV Torvac setup: keep gate valves open during pulse Specific diagnostics: DNB, MSE, HXR array, LH probes Desired diagnostics: reflectometry, divertor heat flux, scanning probes ------------------------------------------------------------------------------ Boronization: no Impurity injector: no ICRF: yes, only J-port (half of day only) LH: yes DNB: yes Cryopump: yes ------------------------------------------------------------------------------ Run plan: For MP553, start with 1101119006 (0.45 MA, 5.4 T, 0.35e20 m-2, USN, cryopump). No argon puffing to begin with. Will use J-port ICRF, but not on the first shot. For MP612, start with 1100820007 (near DN, 0.8 MA, 5.4 T, 0.45e20 m-2). Scan inner gap dynamically to zero, keeping outer gap constant (delta_RCUR = -0.5 * delta_CLEARIN) at a couple of densities. Scan density at a constant inner gap.

Session Leader Summaries

Entered: Dec 1 2010 07:45:05:987PM

Author: Syunichi Shiraiwa

Shot 22 - 34

Successful half day run in term of machine operation without fizzle, dud,
and other technical problems.

The attempt to reproduce the ITB discharges turns out to be difficult
and complicated...
We had one discharge (shot 22), which shows Te0 exceeding 4keV.
There were several shots (shot 23, 25, 26, 34) which shows a break-in-slope in core
soft X ray signal, and the increase of Te0 by about 0.5 keV (from 3keV
to 3.5keV)
Also, ITB foot points seems to be narrower in these discharge.
There is one shot (shot 32) which shows a long delay of the sawtooth
restart.
Shot 21 and 27 had a strong instability probably due to mode locking.

Entered: Dec 1 2010 07:49:21:783PM

Author: Syunichi Shiraiwa

Shot 22 - 34

Asuccessful half day run in term of machine operation without fizzle, dud,
and other technical problems.

The attempt to reproduce the ITB discharges turns out to be difficult
and complicated...
We had one discharge (shot 22), which shows Te0 exceeding 4keV.
There were several shots (shot 23, 25, 26, 34) which shows a break-in-slope in core
soft X ray signal, and the increase of Te0 by about 0.5 keV (from 3keV
to 3.5keV)
Also, ITB foot points seems to be narrower in these discharge.
There is one shot (shot 32) which shows a long delay of the sawtooth
restart.
Shot 21 and 27 had a strong instability probably due to mode locking.

Good experience to me is that ICRF can run without much trouble
with these low current plasmas. It did not show a positive effect
on LHCD, but the reason is still unclear. Also, there seems the enhancement
of fast electron driven? mode during ICRF (see David log book)

Entered: Dec 1 2010 07:51:31:113PM

Author: Greg Wallace

SL summary for 1101201(AM)
MP612: Expanded exploration of LHCD Density Limit

The goal of this run day was to explore the possible synergistic effects of combining double null discharges with reduced inner wall gaps. Previous runs have shown that these two changes can have positive effects on fast electron generation with LHCD at high density. The run plan included six steps:

1) Establish double null with large inner gap at ~600 kW LH, nl_04=4.5e19. (1-2 shots)
2) Scan inner gap during LH from nominal value (~1.25 cm) to zero at nl_04=4.5e19. Scan of inner gap will be dynamic during LH pulse. Outer gap should be ~constant during inner gap scan. (2-3 shots)
3) Increase density to nl_04=7e19 without transition to H-mode. Adjust outer gap as necessary to prevent ionization at LH grill. (2-4 shots)
4) Repeat of step 2 at higher density. Scan inner gap during LH from nominal value (~1.25 cm) to zero at nl_04=7e19. Scan of inner gap will be dynamic during LH pulse. Outer gap should be ~constant during inner gap scan. (2-3 shots)
5) Maintain steady inner gap of 0.3 cm. Ramp density from 4.5-8e19 during LH. (2-3 shots)
6) If time allows, increase LH power to maximum available (~1 MW) to see how much current can be driven at high density in double null with small inner gap.

Unfortunately, only step 1 was definitively achieved (shots 2-3). Step 2 was attempted several times but we moved on since it appeared impossible to maintain accurate density control while approaching zero inner gap. Most of the morning was spent on step 3, however problems were encountered with H-modes and disruptions. On each attempt to apply LH to high density (nebar = 1.3e20) double nulls, the plasma would go into H-mode then vertically disrupt (according to Granetz and Wolfe). Jerry suggested that we were actually seeing radiative disruptions since the upper strike point was on the cryopump slots? Either way, we did not get what we wanted. One attempt was made to get a high density double null with a small inner gap but as usual it went into H-mode and disrupted.

Before trying this experiment again we should come up with a plan on how to keep these high density double nulls from getting into H-mode and disrupting.

Physics Operator Summaries

Entered: Dec 1 2010 04:46:57:627PM

Author: Robert Granetz

Run summary for Wednesday 2010/12/01 MP612 - Expanded exploration of LHCD Density Limit MP553 - Creation of revearsed sheer current profile using LH on low Ip plasmas Session leader: G. Wallace and S. Shiraiwa Physics operator: R. Granetz We ran MP612 for the first half of the day, and MP553 for the 2nd half. MP612 involved running double null configuration, and ramping CLEARIN and RCUR on a subset of shots to vary the inboard gap down to fully limited. The first set of shots went well, but then we raised the density and started getting LH-induced H-modes and disruptions due to vertical instability. We tried reducing the elongation, and decreasing LH power to stay in L-mode, and even reloading an earlier full-length shot, but nothing worked, and we didn't solve the vertical stability problem. MP553 involved low current (0.4 MA), low density (nl_04=0.3e20 m-2) plasmas with LH and some ICRF, as well as the DNB and MSE. All systems worked quite well during this half of the day. There were not computer/network issues today. Scorecard: 32 plasmas (no early shutdowns) 1 dud (cryopump burped) 1 fizzles 0 power supply tests 0 no-power MDS shot cycle -------------- Total: 34 shot cycles

Session Leader Comments

Dec 1 2010 09:05:33:923AM 1101201001 Greg Wallace Attempt to make double null discharge with LH, nl_04=4.5e19. Disruption at .24 s. Current turns around at .2 s. Next shot will repeat.

Dec 1 2010 09:25:20:337AM 1101201002 Greg Wallace Plasma. Not quite double null but very close. A few trips at very end of LH pulse and some hot spots on the A and B rows.

Changes: Increase ZCUR by 2mm to get closer to DN. Decrease RCUR by 2mm to make outer gap slightly bigger. Try again for more steady density and clean LH.

Dec 1 2010 09:35:24:850AM 1101201003 Greg Wallace One trip at very end of LH pulse. Otherwise looks good. Density control pretty good. This will suffice for step 1 of the run plan.

Next shot will move on to step 2---low density inner gap scan.

Dec 1 2010 09:47:23:930AM 1101201004 Greg Wallace Several LH trips at end of gap scan. Otherwise looks pretty good. Small hot spots on A and B rows.

Will back down a bit on LH power. Going from 160 kW/klystron to 145 kW/klystron. Will also try to get inner gap scan to go all the way to zero during LH.

Dec 1 2010 10:10:53:970AM 1101201005 Greg Wallace Density a bit high and ramping down during the discharge. Two trips late in LH pulse. Will try again for better density control.

Dec 1 2010 10:13:21:310AM 1101201006 Greg Wallace LH ran clean. Good shot except for density excursion just before inner gap goes to zero. Will repeat to see if inner wall cleans up.

Dec 1 2010 10:30:11:520AM 1101201007 Greg Wallace Two trips just before plasma hits inner wall limited. Density also bumps up as we approach limited discharge. Will punt on step 2 for now. Moving on to step 3 in the interest of time. Next shot will have steady large inner gap with higher density (nl_04 = 7e19).

Dec 1 2010 10:46:16:773AM 1101201008 Greg Wallace Many trips after 1.0 s. Looks like too much density at the grill. Lots of ionization on B and C rows. Decreasing LH power to 140 kW/klystron. Will decrease RCUR by 2.0 mm and try again.

Dec 1 2010 10:56:45:947AM 1101201009 Greg Wallace Disruption at 1.0 s. LH camera looks OK. Unintended H-mode at .87 s. Will try again.

Dec 1 2010 11:10:32:553AM 1101201010 Greg Wallace Another H-mode and disruption. Try again.

Dec 1 2010 11:21:06:240AM 1101201011 Greg Wallace Dud.

Dec 1 2010 11:33:59:597AM 1101201012 Greg Wallace Fizzle.

Dec 1 2010 12:08:31:980PM 1101201013 Greg Wallace H-mode and disruption again. LH ran clean up to disruption. Reflection coefficient becomes noisier after transition to H-mode at 0.95 s. Next shot will increase RCUR by 2mm to see if that helps prevent vertical disruption.

Dec 1 2010 12:09:51:057PM 1101201014 Greg Wallace H-mode and disruption again. Next shot will try again with LH into dummy load.

Dec 1 2010 12:35:00:110PM 1101201015 Greg Wallace Shot ran full length without LH. H-mode seems to be the problem. Will try again with lower LH power.

Dec 1 2010 12:35:39:560PM 1101201016 Greg Wallace Disruption at 0.45 s. Bob is not getting his candy bar from me yet.

Dec 1 2010 01:00:04:267PM 1101201017 Greg Wallace Went into H-mode and disrupted again. One more shot. Next shot will decrease inner gap to 3mm while keeping outer gap ~constant.

Dec 1 2010 01:08:19:580PM 1101201018 Greg Wallace Disruption a little later this time. Last shot on this MP.

Inner gap was smaller, ~5 mm.

Dec 1 2010 01:28:59:397PM 1101201019 Syunichi Shiraiwa First shot for the second MP

Try to repeat 1101119006

Dec 1 2010 01:29:20:810PM 1101201019 Syunichi Shiraiwa First shot for the second MP

Try to repeat 1101119006. Disrupted at 1.1 due to the vertical instability

Dec 1 2010 01:36:42:523PM 1101201020 Syunichi Shiraiwa Full length,
Injection at 1.15 s

Dec 1 2010 01:39:59:523PM 1101201020 Syunichi Shiraiwa Full length,
Injection at 1.15 s

Next : increase LH power to 160 KW for each and increase outer gap by 5mm

Dec 1 2010 01:41:59:250PM 1101201020 Syunichi Shiraiwa Full length,
Injection at 1.15 s

Next : increase LH power to 160 KW for each and increase outer gap by 5mm
Asked ICRF starting from 1.65 s to 1.8 s by 200kW

Dec 1 2010 02:06:13:290PM 1101201021 Syunichi Shiraiwa Full length
Locked...? Coherent oscillation on soft X-ray core channels.

Dec 1 2010 02:06:24:220PM 1101201022 Syunichi Shiraiwa Full length

Dec 1 2010 02:11:27:830PM 1101201022 Syunichi Shiraiwa Full length
Temperature jumps up to > 4keV..

Dec 1 2010 02:11:48:433PM 1101201022 Syunichi Shiraiwa Full length Close to net zero OH flux swing.
Temperature jumps up to > 4keV..

Dec 1 2010 02:14:13:717PM 1101201022 Syunichi Shiraiwa Full length Close to net zero OH flux swing.
Temperature jumps up to > 4keV..

Next: increase LH to 190kW and ICRF after LH to 500 kW

Dec 1 2010 02:19:35:967PM 1101201022 Syunichi Shiraiwa Full length Close to net zero OH flux swing.
Temperature jumps up to > 4keV..
Clean LH

Next: increase LH to 190kW and ICRF after LH to 500 kW

Dec 1 2010 02:20:00:387PM 1101201023 Syunichi Shiraiwa Full length

Dec 1 2010 02:26:51:430PM 1101201023 Syunichi Shiraiwa Full length

Next: turn off Ar

Dec 1 2010 02:29:37:890PM 1101201023 Syunichi Shiraiwa Full length
Moderate increase of Te at 1.14s
Central soft X-ray behaves similarly

Next: turn off Ar

Dec 1 2010 02:30:26:410PM 1101201023 Syunichi Shiraiwa Full length
Moderate increase of Te at 1.14s
Central soft X-ray behaves similarly

Next: turn off Ar, ICRF after LH to be 500kW

Dec 1 2010 02:46:09:140PM 1101201024 Syunichi Shiraiwa Full length.

Next : Increase LH power

Dec 1 2010 02:47:04:937PM 1101201025 Syunichi Shiraiwa
Ar off

Dec 1 2010 02:51:59:300PM 1101201025 Syunichi Shiraiwa Full length, Ar off

Dec 1 2010 03:03:43:357PM 1101201025 Syunichi Shiraiwa Full length, Ar off
Next : Ar on

Dec 1 2010 03:05:59:270PM 1101201026 Syunichi Shiraiwa Full length
Te0 trace is same as shot 25
Next : Going Step 2

Dec 1 2010 03:13:54:987PM 1101201026 Syunichi Shiraiwa Full length
Te0 trace is same as shot 25, Looks like Ar puff did not make a clear change....?
Next : Going Step 2

Dec 1 2010 03:26:38:100PM 1101201027 Syunichi Shiraiwa Full length
Injection
Next : Moving on step 3.
ICRF from 1.05 to 1.45s, 200kW

Dec 1 2010 03:28:05:210PM 1101201027 Syunichi Shiraiwa Full length
Injection
Next : Moving on step 3. Let's move ICRF from 1.05 to 1.45s, 200kW and reduce LH power back to 180 for each Klystron.

Dec 1 2010 03:34:22:737PM 1101201027 Syunichi Shiraiwa Full length
Injection
Next : Moving on step 3. Let's move ICRF from 1.05 to 1.45s, 200kW and reduce LH power back to 180 for each Klystron. Put phasing back to 90 deg.

Dec 1 2010 03:36:51:097PM 1101201028 Syunichi Shiraiwa Full length

Next : LH 180 deg and ICRF 500 kW

Dec 1 2010 03:54:57:817PM 1101201029 Syunichi Shiraiwa Full length
Higher loop voltage after 1.05s

Next: 2.7e19 m-3 w/o locking !?

Dec 1 2010 04:30:01:870PM 1101201031 Syunichi Shiraiwa Full length
Instability at 1.15s

Next: 3.3e19 m-3 w/o locking !?

Dec 1 2010 04:39:12:953PM 1101201032 Syunichi Shiraiwa Full length
Instability at 1.15s

Next 80 deg. phasing

Dec 1 2010 05:27:56:847PM 1101201034 Syunichi Shiraiwa Full length
ICRF started from 1.3 s 500kW.
The increase of loop voltage seems dramatically large...

Physics Operator Comments

Dec 1 2010 08:53:49:373AM Robert Granetz

The starting shot for MP553 is loaded in seg 2, and the starting shot for MP612 is loaded in seg 3. We'll start with MP612 in order to allow more time for bringing the DNB voltage up, so I've turned off seg 2 and turned on seg 3.

Dec 1 2010 09:05:50:857AM 1101201001 Robert Granetz

Shot 01 -- Plasma, but very short. Looks like a big injection starting at t=0.19 s. Startup looks good. Next shot: no changes, try again

Dec 1 2010 09:24:03:863AM 1101201002 Robert Granetz

Shot 02 -- Plasma, full length. 0.8 MA, 5.4 T, 0.5-0.4e20 m-2, LSN but close to DN, cryopump Next shot: reduce seg 3 gas puffing; set nl_04 to 0.45e20 m-2; raise ZCUR by 2 mm from t=0.7-1.2 s to bring closer to double null; move RCUR in by 2 mm over the same time span to increase outer gap.

Dec 1 2010 09:38:50:220AM 1101201003 Robert Granetz

Shot 03 -- Plasma, full length. 0.81 MA, 5.4 T, 0.45e20 m-2, DN, cryopump. Next shot: implement a CLEARIN inner gap dynamic scan, starting at t=0.7 s and ending with a limited plasma at t=1.2 s. Program RCUR appropriately to keep outer gap constant.

Dec 1 2010 09:46:23:807AM 1101201004 Robert Granetz

Shot 04 -- Plasma, full length. Inner gap scan just misses becoming limited. Outer gap is very steady. Next shot: Tweak CLEARIN scan another 2 mm to unambiguously limit on inboard wall. Tweak RCUR by 1 mm also to keep outer gap constant.

Dec 1 2010 10:05:31:993AM 1101201005 Robert Granetz

Shot 05 -- Plasma, full length. P_LH=0.7 MW. Plasma just barely limits at end of CLEARIN ramp. Density is a bit high early in the flattop. Next shot: tweak CLEARIN and RCUR ramps; adjust ZCUR to make plasma USN at start of flattop in order to better control density with cryopump

Dec 1 2010 10:15:30:960AM 1101201006 Robert Granetz

Shot 06 -- Plasma, nearly full length. Plasma definitely limited towards end of CLEARIN ramp, as evidenced by light on the WIDE2 view. Density rises a bit at this time, maybe from inboard wall fueling. Hopefully that will decrease over the next few shots. P_LH=0.7 MW Next shot: repeat, no changes

Dec 1 2010 10:22:34:610AM 1101201006 Robert Granetz

There might be an air leak on the tokamak (noticed on the RGA after shot 6.

Dec 1 2010 10:29:52:873AM 1101201007 Robert Granetz

Shot 07 -- Plasma, nearly full length. Good inner gap scan. P_LH=0.7 MW. No sign of any air leak. Next shot: increase nl_04 to 0.7e20 m-2; remove CLEARIN and RCUR scans

Dec 1 2010 10:44:19:547AM 1101201008 Robert Granetz

Shot 08 -- Plasma, full length. 0.81 MA, 5.4 T, 0.76e20 m-2, near DN, cryopump, no gap scan. LH faulted a lot. Next shot: move RCUR in by 2 mm to increase outer gap

Dec 1 2010 10:56:17:890AM 1101201009 Robert Granetz

Shot 09 -- Plasma, disrupted at t=0.99 s. I think it was hit by an impurity injection. Next shot: repeat, no changes

Dec 1 2010 11:13:06:850AM 1101201010 Robert Granetz

Shot 10 -- Plasma, disrupted at t=1.05 s. Doesn't look like an injection though. It's on the edge of being vertically unstable. kappa=1.75-1.80 Next shot: move ZXL up by 4 mm and ZXU down by 4 mm to reduce elongation

Dec 1 2010 11:22:59:047AM 1101201011 Robert Granetz

Shot 11 -- Dud. Probably due to a cryopump regeneration before the shot, but the ratiomatic gauge wasn't on. All the power supplies worked well. Next shot: try again

Dec 1 2010 11:38:23:380AM 1101201012 Robert Granetz

Shot 12 -- Fizzle. Bz is too high. Next shot: add -15 A to IC_EF4

Dec 1 2010 12:03:18:440PM 1101201013 Robert Granetz

Shot 13 -- Plasma, disrupted at t=1.06 s due to vertical instability, even though the elongation has been reduced to 1.73 on this shot. There's a transition to H-mode around then too. Can't see what the problem is. Next shot: reload seg 3 from shot 8 seg 3 (the last full-length shot)

Dec 1 2010 12:09:00:930PM 1101201014 Robert Granetz

Shot 14 -- Plasma, but again disrupted at t=1.05 s. This is a repeat of shot 8, which was full length. This shot also started into H-mode, whereas shot 8 did not. Next shot: repeat, but turn off the LH.

Dec 1 2010 12:27:00:390PM 1101201015 Robert Granetz

Shot 15 -- Plasma, full length (finally). This shot had the LH turned off, and we did not go into H-mode, and we did not go vertically unstable. It's pretty clear that those three things are linked together, at least in the double-null plasmas. We can try USN, or lower LH power, or increase the density. Next shot: turn LH back on, but at reduced power; no DPCS changes

Dec 1 2010 12:38:57:787PM 1101201016 Robert Granetz

Shot 16 -- Plasma, but disrupted at t=0.45 because a PF breaker pulled. Next shot: repeat, no changes (reduced LH power)

Dec 1 2010 01:00:09:203PM 1101201017 Robert Granetz

Shot 17 -- Plasma, but disrupts at t=1.05 s again due to vertical instability, which has something to do with going into H-mode with the LH power. Next shot: decrease inboard gap by 9 mm (to be 3 mm) and decrease RCUR by 4.5 mm to keep the outer gap the same

Dec 1 2010 01:12:01:577PM 1101201018 Robert Granetz

Shot 18 -- Plasma, but disrupted at t=1.22 s, again due to vertical instability. This shot briefly when into H-mode, but it was back in L-mode when the disruption occurred. End of MP612 for today. Next shot: start on MP553 by turning on seg 2 and turning off seg 3. Fire DNB.

Dec 1 2010 01:28:12:310PM 1101201019 Robert Granetz

Shot 19 -- Plasma, disrupts at t=1.12 s due to issues with EF2s and EF4. 0.42 MA, 5.4 T, 0.3e20 m-2, USN, cryopump. P_LH=0.7 MW Next shot: reduce IC_EF4 to 500 A (from 2500 A) as per Steve Wolfe's suggestion

Dec 1 2010 01:41:57:140PM 1101201020 Robert Granetz

Shot 20 -- Plasma, full length. Shot lasts until t=2.1 s. 0.4 MA, 5.4 T, 0.3e20 m-2, USN, cryopump. P_LH=0.7 MW. DNB fired 6 pulses. ECE and TS showed bizarre central electron temperatures. Neuts_hards saturated after t=1.2 s through the end of the discharge. Next shot: move RCUR in by 2 mm; turn on ICRF at t=1.65 s

Dec 1 2010 01:55:05:957PM 1101201021 Robert Granetz

Shot 21 -- Plasma, full length. 0.42 MA, 5.4 T, 0.3e20 m-2, USN, cryopump. P_LH=0.8 MW. P_ICRF=0.25 MW late in the shot from J only. DNB fired. Next shot: move RCUR in another 3 mm to increase outer gap some more

Dec 1 2010 02:13:32:793PM 1101201022 Robert Granetz

Shot 22 -- Plasma, full length. Similar to preceding shot, except that outer gap has increased to 2.1 cm. P_Lh=0.8 MW, P_ICRF=0.25 MW. Next shot: no DPCS changes; increase LH power; increase ICRF power

Dec 1 2010 02:24:50:247PM 1101201023 Robert Granetz

Shot 23 -- Plasma, full length. P_LH=0.9 MW, P_ICRF=0.25 MW. DNB fired. Next shot: turn off argon

Dec 1 2010 02:46:34:243PM 1101201024 Robert Granetz

Shot 24 -- Plasma, full length. Similar to preceding shots. P_LH=0.9 MW, P_ICRF=0.6 MW. Good DNB. No argon. Next shot: add -10 A to IC_EF4

Dec 1 2010 02:54:31:757PM 1101201025 Robert Granetz

Shot 25 -- Plasma, full length. Same as preceding shots. P_LH=0.92 MW, P_ICRF=0.5 MW. Good DNB. Next shot: move RCUR in by 1 mm; turn on argon puff

Dec 1 2010 03:12:28:820PM 1101201026 Robert Granetz

Shot 26 -- Plasma, full length. Same-o, same-o. P_LH=0.92 MW, P_ICRF=0.78 MW. Good DNB. Next shot: add another -5 A to IC_EF4; LH phasing will be changed

Dec 1 2010 03:28:43:727PM 1101201027 Robert Granetz

Shot 27 -- Plasma, disrupted at t=1.43 s due to an impurity injection. Next shot: add +10 A to IC_EF4; ICRF power will be turned on earlier

Dec 1 2010 03:38:32:523PM 1101201028 Robert Granetz

Shot 28 -- Plasma, full length. Same discharge. P_LH=0.83 MW, P_ICRF=0.26 MW. Good DNB. Next shot: no DPCS changes

Dec 1 2010 03:50:42:507PM 1101201029 Robert Granetz

Shot 29 -- Plasma, full length. P_LH=0.89 MW, P_ICRF=0.6 MW Next shot: tweak PG3 gas programming in seg 1; reduce nl_04 to 0.27e20 m-2

Dec 1 2010 04:12:10:620PM 1101201030 Robert Granetz

Shot 30 -- Plasma, full length. Next shot: no DPCS changes

Dec 1 2010 04:28:21:860PM 1101201030 Robert Granetz

Shot 31 -- Plasma, full length. Same as preceding shots. Next shot: increase nl_04 to 0.33e20 m-2

Dec 1 2010 04:41:25:683PM 1101201032 Robert Granetz

Shot 32 -- Plasma, full length. Same. Next shot: no DPCS changes; no ICRF

Dec 1 2010 04:50:58:077PM 1101201033 Robert Granetz

Shot 33 -- Plasma, full length. Same. Next shot: reduce nl_04 to 0.30e20 m-2; turn ICRF back on

Dec 1 2010 04:51:07:670PM 1101201034 Robert Granetz

Shot 34 -- Plasma, full length. Same. P_LH=0.98 MW, P_ICRF=0.5 MW End of run

Engineering Operator Comments

Shot Time Type Status Comment

1 09:01:26:717AM Plasma Ok

2 09:14:07:147AM Plasma Ok

3 09:26:54:510AM Plasma Ok

4 09:39:35:163AM Plasma Ok

5 09:53:25:520AM Plasma Ok

6 10:08:12:680AM Plasma Ok

7 10:22:28:337AM Plasma Ok

8 10:36:43:890AM Plasma Ok

9 10:50:58:630AM Plasma Ok

10 11:04:41:090AM Plasma Ok

11 11:19:08:580AM Plasma Ok

12 11:31:49:897AM Plasma Ok

13 11:44:22:293AM Plasma Ok

14 12:04:41:240PM Plasma Ok

15 12:17:12:660PM Plasma Ok

16 12:31:23:183PM Plasma Bad OH2L commutation fault

17 12:52:07:363PM Plasma Ok

18 01:04:31:743PM Plasma Ok

19 01:17:18:127PM Plasma Ok

20 01:30:30:860PM Plasma Ok

21 01:46:21:680PM Plasma Ok

22 02:04:10:653PM Plasma Ok

23 02:17:13:057PM Plasma Ok

24 02:30:39:100PM Plasma Ok

25 02:48:51:320PM Plasma Ok

26 03:02:05:673PM Plasma Ok

27 03:17:26:590PM Plasma Ok

28 03:29:58:810PM Plasma Ok

29 03:44:13:290PM Plasma Ok

30 03:59:49:407PM Plasma Ok

31 04:12:56:220PM Plasma Ok

32 04:29:09:503PM Plasma Ok

33 04:43:16:577PM Plasma Ok

34 04:56:45:690PM Plasma Ok

System Availability

Dec 1 2010 09:01:08:813AM

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 BES system is online Oct 21 2010 11:33AM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan
Bolometers yes 2pi (D+F) working. All midplane and off-midplane diode arrays working except WB1AX. Midplane foils calibrated and PRAD_MAIN is being filled. Divertor/Ledge foils not yet ready. Jul 15 2010 08:27AM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization yes Nov 16 2010 02:36PM (dekow) Jim Irby Boronization dekow,irby
CNPA yes Multiple channel CNPA available Oct 21 2010 07:11PM (parker) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor no Shut down. Helium dewar removed. LN2 manual valve and solenoid valves are closed and tagged. Apr 06 2010 10:51AM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard
CXRS yes Wide-view CXRS system is online Oct 21 2010 11:33AM (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; new calibrations (relative brightness and position) not yet implemented Jun 29 2010 10:27AM (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 Operational Jun 26 2010 09:28PM (irby) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer
FRC-ECE yes All channels working and calibrated. Oct 27 2010 03:41PM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes Gauges are operational. Jun 28 2010 08:02PM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
Glow Discharge no Plugs for Power Supply and Controls have been unplugged and red tagged making system safe for In-Vessel Access. Apr 05 2010 11:18AM (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. Oct 22 2010 11:46AM (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 operating normally Jun 29 2010 10:26AM (marmar) Earl Marmar H/D Ratio marmar
HEAT yes Jun 26 2010 11:19PM (dekow) Gary Dekow - Machine Heaters - burke,dekow
Hirex Jr yes Hirex-Jr has been installed Jun 28 2010 03:36PM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr yes System installed and aligned. Inverted profiles are still not available. Jul 22 2010 08:41AM (ypodpaly) John Rice High Resolution X-Ray ince,rice,ypodpaly
HXR yes 32 Channels operational Oct 23 2010 01:41PM (parker) Ron Parker Hard X-Ray Array faust,parker,schmidt
ICRF D-Antenna yes system checked out ok on 11006728. Jun 28 2010 04:57PM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes system checked out ok on 1100628 Jun 28 2010 04:57PM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes system checked out ok. conditioned to vacuum. Jun 28 2010 04:58PM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Laser Blow-Off yes operational and tested Jul 20 2010 04:42PM (g) Martin Greenwald Impurity Injection System g,nthoward
Lower Hybrid yes LH working. New directional couplers installed at input to each klystron. Oct 21 2010 11:42AM (dterry) Ron Parker Lower Hybrid dterry,parker,wallaceg
Lower Hybrid Reflectometer yes 50GHz: up-, 60 GHz up- and down- Oct 21 2010 11:31AM (sgbaek) Arturo Dominguez Lower Hybrid Reflectometer dominguez,marmar,parker,sgbaek
Lower Hybrid SOL reflectometer yes differential phase (profile) working since 8/27/2010. full phase (fluctuations + profile) is not. If put on a miniproposal, please request LH launcher to be moved in Oct 05 2010 11:26AM (cornwall) Cornwall Lau Lower Hybrid SOL reflectometer cornwall,wukitch,ylin
LPI no Beam line removed May 30 2008 02:09PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha no WB4LY and LLY working but not during ICRF. WB1LY not attached due to pickup problems. LYMID attached but have profile problems. Aug 24 2010 09:17AM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes Spectra being collected and tree filled. Wavelength scan is broken so fixed on the Mo XXXI and XXXII lines. Jul 15 2010 08:28AM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Operational. Oct 22 2010 11:46AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes Gauges are operational Jun 28 2010 08:02PM (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 All systems are on and functional Jun 29 2010 12:56PM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes PMT Neuts_hards, ssd_x01, ssd_x02, ssd_x03 Jun 26 2010 09:21PM (irby) Jim Irby X-Ray/Neutron Detectors at K-Hor irby
NINJA no Capillaries tested in-vessel. Jun 28 2010 08:08PM (labombard) Brian LaBombard NINJA gas puff labombard,terry
PCI no Down due to broken laser shutter. Nov 22 2010 10:44AM (ntsujii) Miklos Porkolab Phase Contrast Imaging arai,ennever,ntsujii,porkolab
Penning Gauges no High voltage power supplies are turned off, waiting for work at A-port horizontal to be finished. Jun 28 2010 08:07PM (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 Jun 26 2010 11:19PM (dekow) Gary Dekow feeds all the other supplies cochran,dekow,dterry,irby
Power - PEI yes Jun 26 2010 11:19PM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby
Power - TMX yes Jun 26 2010 11:19PM (dekow) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby
Power Systems yes Jun 26 2010 11:20PM (dekow) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby
Probe Array - ISD yes Operational. Jun 28 2010 08:03PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes Operational. Jun 28 2010 08:03PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes F and J outer divertor probes are operational. Jun 28 2010 08:04PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes Operational, except probe#13 Jun 28 2010 08:04PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes As of 1101123, the 60, 88u, 88l, 140 and variable set at 115GHz are operational. The 50, 75 and 112 are nonoperational. On 1101123, the noise band at ~200kHz is again seen on the 88u and 88l channels. Nov 23 2010 09:30AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Operational. New Langmuir-Mach probe head installed. Jun 28 2010 08:05PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Operational. Jun 28 2010 08:05PM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes Both A and K units are operational. Coil polarity needs to be checked. Jun 28 2010 08:06PM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
Sparker yes HV supply on, cable run to sparker at k-hor Jun 23 2010 02:41PM (irby) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin
Surface Science Station yes SSS installed and leak tested. Oct 21 2010 11:31AM (ochoukov) Bruce Lipschultz Radially scanning probe located on K-port blip,ochoukov
TCI yes No new CO2 detector, so still missing edge channels Jun 23 2010 02:40PM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes Operating with 2 lasers Oct 22 2010 01:06PM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes,yma
TS - Edge yes Operational Jul 14 2010 11:54AM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes,yma
Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf
XEUS yes Operational. Raw spectra stored but not line brightness time histories are going into the tree yet. Aug 24 2010 09:17AM (mlreinke) Matt Reinke X-ray Extended Ultraviolet Spectrometer mlreinke
XTOMO yes Core system working. Edge system waiting for H-modes. Jul 01 2010 11:55AM (mlreinke) Bob Granetz X-Ray Tomography granetz,mlreinke

Session Leader Comments
Dec 1 2010 09:05:33:923AM	1101201001	Greg Wallace	Attempt to make double null discharge with LH, nl_04=4.5e19. Disruption at .24 s. Current turns around at .2 s. Next shot will repeat.
Dec 1 2010 09:25:20:337AM	1101201002	Greg Wallace	Plasma. Not quite double null but very close. A few trips at very end of LH pulse and some hot spots on the A and B rows. Changes: Increase ZCUR by 2mm to get closer to DN. Decrease RCUR by 2mm to make outer gap slightly bigger. Try again for more steady density and clean LH.
Dec 1 2010 09:35:24:850AM	1101201003	Greg Wallace	One trip at very end of LH pulse. Otherwise looks good. Density control pretty good. This will suffice for step 1 of the run plan. Next shot will move on to step 2---low density inner gap scan.
Dec 1 2010 09:47:23:930AM	1101201004	Greg Wallace	Several LH trips at end of gap scan. Otherwise looks pretty good. Small hot spots on A and B rows. Will back down a bit on LH power. Going from 160 kW/klystron to 145 kW/klystron. Will also try to get inner gap scan to go all the way to zero during LH.
Dec 1 2010 10:10:53:970AM	1101201005	Greg Wallace	Density a bit high and ramping down during the discharge. Two trips late in LH pulse. Will try again for better density control.
Dec 1 2010 10:13:21:310AM	1101201006	Greg Wallace	LH ran clean. Good shot except for density excursion just before inner gap goes to zero. Will repeat to see if inner wall cleans up.
Dec 1 2010 10:30:11:520AM	1101201007	Greg Wallace	Two trips just before plasma hits inner wall limited. Density also bumps up as we approach limited discharge. Will punt on step 2 for now. Moving on to step 3 in the interest of time. Next shot will have steady large inner gap with higher density (nl_04 = 7e19).
Dec 1 2010 10:46:16:773AM	1101201008	Greg Wallace	Many trips after 1.0 s. Looks like too much density at the grill. Lots of ionization on B and C rows. Decreasing LH power to 140 kW/klystron. Will decrease RCUR by 2.0 mm and try again.
Dec 1 2010 10:56:45:947AM	1101201009	Greg Wallace	Disruption at 1.0 s. LH camera looks OK. Unintended H-mode at .87 s. Will try again.
Dec 1 2010 11:10:32:553AM	1101201010	Greg Wallace	Another H-mode and disruption. Try again.
Dec 1 2010 11:21:06:240AM	1101201011	Greg Wallace	Dud.
Dec 1 2010 11:33:59:597AM	1101201012	Greg Wallace	Fizzle.
Dec 1 2010 12:08:31:980PM	1101201013	Greg Wallace	H-mode and disruption again. LH ran clean up to disruption. Reflection coefficient becomes noisier after transition to H-mode at 0.95 s. Next shot will increase RCUR by 2mm to see if that helps prevent vertical disruption.
Dec 1 2010 12:09:51:057PM	1101201014	Greg Wallace	H-mode and disruption again. Next shot will try again with LH into dummy load.
Dec 1 2010 12:35:00:110PM	1101201015	Greg Wallace	Shot ran full length without LH. H-mode seems to be the problem. Will try again with lower LH power.
Dec 1 2010 12:35:39:560PM	1101201016	Greg Wallace	Disruption at 0.45 s. Bob is not getting his candy bar from me yet.
Dec 1 2010 01:00:04:267PM	1101201017	Greg Wallace	Went into H-mode and disrupted again. One more shot. Next shot will decrease inner gap to 3mm while keeping outer gap ~constant.
Dec 1 2010 01:08:19:580PM	1101201018	Greg Wallace	Disruption a little later this time. Last shot on this MP. Inner gap was smaller, ~5 mm.
Dec 1 2010 01:28:59:397PM	1101201019	Syunichi Shiraiwa	First shot for the second MP Try to repeat 1101119006
Dec 1 2010 01:29:20:810PM	1101201019	Syunichi Shiraiwa	First shot for the second MP Try to repeat 1101119006. Disrupted at 1.1 due to the vertical instability
Dec 1 2010 01:36:42:523PM	1101201020	Syunichi Shiraiwa	Full length, Injection at 1.15 s
Dec 1 2010 01:39:59:523PM	1101201020	Syunichi Shiraiwa	Full length, Injection at 1.15 s Next : increase LH power to 160 KW for each and increase outer gap by 5mm
Dec 1 2010 01:41:59:250PM	1101201020	Syunichi Shiraiwa	Full length, Injection at 1.15 s Next : increase LH power to 160 KW for each and increase outer gap by 5mm Asked ICRF starting from 1.65 s to 1.8 s by 200kW
Dec 1 2010 02:06:13:290PM	1101201021	Syunichi Shiraiwa	Full length Locked...? Coherent oscillation on soft X-ray core channels.
Dec 1 2010 02:06:24:220PM	1101201022	Syunichi Shiraiwa	Full length
Dec 1 2010 02:11:27:830PM	1101201022	Syunichi Shiraiwa	Full length Temperature jumps up to > 4keV..
Dec 1 2010 02:11:48:433PM	1101201022	Syunichi Shiraiwa	Full length Close to net zero OH flux swing. Temperature jumps up to > 4keV..
Dec 1 2010 02:14:13:717PM	1101201022	Syunichi Shiraiwa	Full length Close to net zero OH flux swing. Temperature jumps up to > 4keV.. Next: increase LH to 190kW and ICRF after LH to 500 kW
Dec 1 2010 02:19:35:967PM	1101201022	Syunichi Shiraiwa	Full length Close to net zero OH flux swing. Temperature jumps up to > 4keV.. Clean LH Next: increase LH to 190kW and ICRF after LH to 500 kW
Dec 1 2010 02:20:00:387PM	1101201023	Syunichi Shiraiwa	Full length
Dec 1 2010 02:26:51:430PM	1101201023	Syunichi Shiraiwa	Full length Next: turn off Ar
Dec 1 2010 02:29:37:890PM	1101201023	Syunichi Shiraiwa	Full length Moderate increase of Te at 1.14s Central soft X-ray behaves similarly Next: turn off Ar
Dec 1 2010 02:30:26:410PM	1101201023	Syunichi Shiraiwa	Full length Moderate increase of Te at 1.14s Central soft X-ray behaves similarly Next: turn off Ar, ICRF after LH to be 500kW
Dec 1 2010 02:46:09:140PM	1101201024	Syunichi Shiraiwa	Full length. Next : Increase LH power
Dec 1 2010 02:47:04:937PM	1101201025	Syunichi Shiraiwa	Ar off
Dec 1 2010 02:51:59:300PM	1101201025	Syunichi Shiraiwa	Full length, Ar off
Dec 1 2010 03:03:43:357PM	1101201025	Syunichi Shiraiwa	Full length, Ar off Next : Ar on
Dec 1 2010 03:05:59:270PM	1101201026	Syunichi Shiraiwa	Full length Te0 trace is same as shot 25 Next : Going Step 2
Dec 1 2010 03:13:54:987PM	1101201026	Syunichi Shiraiwa	Full length Te0 trace is same as shot 25, Looks like Ar puff did not make a clear change....? Next : Going Step 2
Dec 1 2010 03:26:38:100PM	1101201027	Syunichi Shiraiwa	Full length Injection Next : Moving on step 3. ICRF from 1.05 to 1.45s, 200kW
Dec 1 2010 03:28:05:210PM	1101201027	Syunichi Shiraiwa	Full length Injection Next : Moving on step 3. Let's move ICRF from 1.05 to 1.45s, 200kW and reduce LH power back to 180 for each Klystron.
Dec 1 2010 03:34:22:737PM	1101201027	Syunichi Shiraiwa	Full length Injection Next : Moving on step 3. Let's move ICRF from 1.05 to 1.45s, 200kW and reduce LH power back to 180 for each Klystron. Put phasing back to 90 deg.
Dec 1 2010 03:36:51:097PM	1101201028	Syunichi Shiraiwa	Full length Next : LH 180 deg and ICRF 500 kW
Dec 1 2010 03:54:57:817PM	1101201029	Syunichi Shiraiwa	Full length Higher loop voltage after 1.05s Next: 2.7e19 m-3 w/o locking !?
Dec 1 2010 04:30:01:870PM	1101201031	Syunichi Shiraiwa	Full length Instability at 1.15s Next: 3.3e19 m-3 w/o locking !?
Dec 1 2010 04:39:12:953PM	1101201032	Syunichi Shiraiwa	Full length Instability at 1.15s Next 80 deg. phasing
Dec 1 2010 05:27:56:847PM	1101201034	Syunichi Shiraiwa	Full length ICRF started from 1.3 s 500kW. The increase of loop voltage seems dramatically large...

Physics Operator Comments
Dec 1 2010 08:53:49:373AM		Robert Granetz	The starting shot for MP553 is loaded in seg 2, and the starting shot for MP612 is loaded in seg 3. We'll start with MP612 in order to allow more time for bringing the DNB voltage up, so I've turned off seg 2 and turned on seg 3.
Dec 1 2010 09:05:50:857AM	1101201001	Robert Granetz	Shot 01 -- Plasma, but very short. Looks like a big injection starting at t=0.19 s. Startup looks good. Next shot: no changes, try again
Dec 1 2010 09:24:03:863AM	1101201002	Robert Granetz	Shot 02 -- Plasma, full length. 0.8 MA, 5.4 T, 0.5-0.4e20 m-2, LSN but close to DN, cryopump Next shot: reduce seg 3 gas puffing; set nl_04 to 0.45e20 m-2; raise ZCUR by 2 mm from t=0.7-1.2 s to bring closer to double null; move RCUR in by 2 mm over the same time span to increase outer gap.
Dec 1 2010 09:38:50:220AM	1101201003	Robert Granetz	Shot 03 -- Plasma, full length. 0.81 MA, 5.4 T, 0.45e20 m-2, DN, cryopump. Next shot: implement a CLEARIN inner gap dynamic scan, starting at t=0.7 s and ending with a limited plasma at t=1.2 s. Program RCUR appropriately to keep outer gap constant.
Dec 1 2010 09:46:23:807AM	1101201004	Robert Granetz	Shot 04 -- Plasma, full length. Inner gap scan just misses becoming limited. Outer gap is very steady. Next shot: Tweak CLEARIN scan another 2 mm to unambiguously limit on inboard wall. Tweak RCUR by 1 mm also to keep outer gap constant.
Dec 1 2010 10:05:31:993AM	1101201005	Robert Granetz	Shot 05 -- Plasma, full length. P_LH=0.7 MW. Plasma just barely limits at end of CLEARIN ramp. Density is a bit high early in the flattop. Next shot: tweak CLEARIN and RCUR ramps; adjust ZCUR to make plasma USN at start of flattop in order to better control density with cryopump
Dec 1 2010 10:15:30:960AM	1101201006	Robert Granetz	Shot 06 -- Plasma, nearly full length. Plasma definitely limited towards end of CLEARIN ramp, as evidenced by light on the WIDE2 view. Density rises a bit at this time, maybe from inboard wall fueling. Hopefully that will decrease over the next few shots. P_LH=0.7 MW Next shot: repeat, no changes
Dec 1 2010 10:22:34:610AM	1101201006	Robert Granetz	There might be an air leak on the tokamak (noticed on the RGA after shot 6.
Dec 1 2010 10:29:52:873AM	1101201007	Robert Granetz	Shot 07 -- Plasma, nearly full length. Good inner gap scan. P_LH=0.7 MW. No sign of any air leak. Next shot: increase nl_04 to 0.7e20 m-2; remove CLEARIN and RCUR scans
Dec 1 2010 10:44:19:547AM	1101201008	Robert Granetz	Shot 08 -- Plasma, full length. 0.81 MA, 5.4 T, 0.76e20 m-2, near DN, cryopump, no gap scan. LH faulted a lot. Next shot: move RCUR in by 2 mm to increase outer gap
Dec 1 2010 10:56:17:890AM	1101201009	Robert Granetz	Shot 09 -- Plasma, disrupted at t=0.99 s. I think it was hit by an impurity injection. Next shot: repeat, no changes
Dec 1 2010 11:13:06:850AM	1101201010	Robert Granetz	Shot 10 -- Plasma, disrupted at t=1.05 s. Doesn't look like an injection though. It's on the edge of being vertically unstable. kappa=1.75-1.80 Next shot: move ZXL up by 4 mm and ZXU down by 4 mm to reduce elongation
Dec 1 2010 11:22:59:047AM	1101201011	Robert Granetz	Shot 11 -- Dud. Probably due to a cryopump regeneration before the shot, but the ratiomatic gauge wasn't on. All the power supplies worked well. Next shot: try again
Dec 1 2010 11:38:23:380AM	1101201012	Robert Granetz	Shot 12 -- Fizzle. Bz is too high. Next shot: add -15 A to IC_EF4
Dec 1 2010 12:03:18:440PM	1101201013	Robert Granetz	Shot 13 -- Plasma, disrupted at t=1.06 s due to vertical instability, even though the elongation has been reduced to 1.73 on this shot. There's a transition to H-mode around then too. Can't see what the problem is. Next shot: reload seg 3 from shot 8 seg 3 (the last full-length shot)
Dec 1 2010 12:09:00:930PM	1101201014	Robert Granetz	Shot 14 -- Plasma, but again disrupted at t=1.05 s. This is a repeat of shot 8, which was full length. This shot also started into H-mode, whereas shot 8 did not. Next shot: repeat, but turn off the LH.
Dec 1 2010 12:27:00:390PM	1101201015	Robert Granetz	Shot 15 -- Plasma, full length (finally). This shot had the LH turned off, and we did not go into H-mode, and we did not go vertically unstable. It's pretty clear that those three things are linked together, at least in the double-null plasmas. We can try USN, or lower LH power, or increase the density. Next shot: turn LH back on, but at reduced power; no DPCS changes
Dec 1 2010 12:38:57:787PM	1101201016	Robert Granetz	Shot 16 -- Plasma, but disrupted at t=0.45 because a PF breaker pulled. Next shot: repeat, no changes (reduced LH power)
Dec 1 2010 01:00:09:203PM	1101201017	Robert Granetz	Shot 17 -- Plasma, but disrupts at t=1.05 s again due to vertical instability, which has something to do with going into H-mode with the LH power. Next shot: decrease inboard gap by 9 mm (to be 3 mm) and decrease RCUR by 4.5 mm to keep the outer gap the same
Dec 1 2010 01:12:01:577PM	1101201018	Robert Granetz	Shot 18 -- Plasma, but disrupted at t=1.22 s, again due to vertical instability. This shot briefly when into H-mode, but it was back in L-mode when the disruption occurred. End of MP612 for today. Next shot: start on MP553 by turning on seg 2 and turning off seg 3. Fire DNB.
Dec 1 2010 01:28:12:310PM	1101201019	Robert Granetz	Shot 19 -- Plasma, disrupts at t=1.12 s due to issues with EF2s and EF4. 0.42 MA, 5.4 T, 0.3e20 m-2, USN, cryopump. P_LH=0.7 MW Next shot: reduce IC_EF4 to 500 A (from 2500 A) as per Steve Wolfe's suggestion
Dec 1 2010 01:41:57:140PM	1101201020	Robert Granetz	Shot 20 -- Plasma, full length. Shot lasts until t=2.1 s. 0.4 MA, 5.4 T, 0.3e20 m-2, USN, cryopump. P_LH=0.7 MW. DNB fired 6 pulses. ECE and TS showed bizarre central electron temperatures. Neuts_hards saturated after t=1.2 s through the end of the discharge. Next shot: move RCUR in by 2 mm; turn on ICRF at t=1.65 s
Dec 1 2010 01:55:05:957PM	1101201021	Robert Granetz	Shot 21 -- Plasma, full length. 0.42 MA, 5.4 T, 0.3e20 m-2, USN, cryopump. P_LH=0.8 MW. P_ICRF=0.25 MW late in the shot from J only. DNB fired. Next shot: move RCUR in another 3 mm to increase outer gap some more
Dec 1 2010 02:13:32:793PM	1101201022	Robert Granetz	Shot 22 -- Plasma, full length. Similar to preceding shot, except that outer gap has increased to 2.1 cm. P_Lh=0.8 MW, P_ICRF=0.25 MW. Next shot: no DPCS changes; increase LH power; increase ICRF power
Dec 1 2010 02:24:50:247PM	1101201023	Robert Granetz	Shot 23 -- Plasma, full length. P_LH=0.9 MW, P_ICRF=0.25 MW. DNB fired. Next shot: turn off argon
Dec 1 2010 02:46:34:243PM	1101201024	Robert Granetz	Shot 24 -- Plasma, full length. Similar to preceding shots. P_LH=0.9 MW, P_ICRF=0.6 MW. Good DNB. No argon. Next shot: add -10 A to IC_EF4
Dec 1 2010 02:54:31:757PM	1101201025	Robert Granetz	Shot 25 -- Plasma, full length. Same as preceding shots. P_LH=0.92 MW, P_ICRF=0.5 MW. Good DNB. Next shot: move RCUR in by 1 mm; turn on argon puff
Dec 1 2010 03:12:28:820PM	1101201026	Robert Granetz	Shot 26 -- Plasma, full length. Same-o, same-o. P_LH=0.92 MW, P_ICRF=0.78 MW. Good DNB. Next shot: add another -5 A to IC_EF4; LH phasing will be changed
Dec 1 2010 03:28:43:727PM	1101201027	Robert Granetz	Shot 27 -- Plasma, disrupted at t=1.43 s due to an impurity injection. Next shot: add +10 A to IC_EF4; ICRF power will be turned on earlier
Dec 1 2010 03:38:32:523PM	1101201028	Robert Granetz	Shot 28 -- Plasma, full length. Same discharge. P_LH=0.83 MW, P_ICRF=0.26 MW. Good DNB. Next shot: no DPCS changes
Dec 1 2010 03:50:42:507PM	1101201029	Robert Granetz	Shot 29 -- Plasma, full length. P_LH=0.89 MW, P_ICRF=0.6 MW Next shot: tweak PG3 gas programming in seg 1; reduce nl_04 to 0.27e20 m-2
Dec 1 2010 04:12:10:620PM	1101201030	Robert Granetz	Shot 30 -- Plasma, full length. Next shot: no DPCS changes
Dec 1 2010 04:28:21:860PM	1101201030	Robert Granetz	Shot 31 -- Plasma, full length. Same as preceding shots. Next shot: increase nl_04 to 0.33e20 m-2
Dec 1 2010 04:41:25:683PM	1101201032	Robert Granetz	Shot 32 -- Plasma, full length. Same. Next shot: no DPCS changes; no ICRF
Dec 1 2010 04:50:58:077PM	1101201033	Robert Granetz	Shot 33 -- Plasma, full length. Same. Next shot: reduce nl_04 to 0.30e20 m-2; turn ICRF back on
Dec 1 2010 04:51:07:670PM	1101201034	Robert Granetz	Shot 34 -- Plasma, full length. Same. P_LH=0.98 MW, P_ICRF=0.5 MW End of run

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:01:26:717AM	Plasma	Ok
2	09:14:07:147AM	Plasma	Ok
3	09:26:54:510AM	Plasma	Ok
4	09:39:35:163AM	Plasma	Ok
5	09:53:25:520AM	Plasma	Ok
6	10:08:12:680AM	Plasma	Ok
7	10:22:28:337AM	Plasma	Ok
8	10:36:43:890AM	Plasma	Ok
9	10:50:58:630AM	Plasma	Ok
10	11:04:41:090AM	Plasma	Ok
11	11:19:08:580AM	Plasma	Ok
12	11:31:49:897AM	Plasma	Ok
13	11:44:22:293AM	Plasma	Ok
14	12:04:41:240PM	Plasma	Ok
15	12:17:12:660PM	Plasma	Ok
16	12:31:23:183PM	Plasma	Bad	OH2L commutation fault
17	12:52:07:363PM	Plasma	Ok
18	01:04:31:743PM	Plasma	Ok
19	01:17:18:127PM	Plasma	Ok
20	01:30:30:860PM	Plasma	Ok
21	01:46:21:680PM	Plasma	Ok
22	02:04:10:653PM	Plasma	Ok
23	02:17:13:057PM	Plasma	Ok
24	02:30:39:100PM	Plasma	Ok
25	02:48:51:320PM	Plasma	Ok
26	03:02:05:673PM	Plasma	Ok
27	03:17:26:590PM	Plasma	Ok
28	03:29:58:810PM	Plasma	Ok
29	03:44:13:290PM	Plasma	Ok
30	03:59:49:407PM	Plasma	Ok
31	04:12:56:220PM	Plasma	Ok
32	04:29:09:503PM	Plasma	Ok
33	04:43:16:577PM	Plasma	Ok
34	04:56:45:690PM	Plasma	Ok