Alcator C-Mod Run 1120919 Information

Miniproposals

Miniproposal: 702

Date Filed: 5/16/2012

Title: Cold pulse modulation experiments for the study of non-local heat transport and correlation with rot

First Author: Chi Gao

Session Leader: Chi Gao (shots 1-23)

Operators
Session leader(s):	Chi Gao
Physics operator(s):	Jerry Hughes
Engineering operator(s):	Sam Pierson,Gary Dekow,Thomas Toland,Ed Fitzgerald

Engineering Operator Run Comment
MP 702: Cold pulse modulation experiments

Session Leader Plans

Entered: Sep 18 2012 03:51:30:590PM

Author: Ken Liao

Both I-mode runs are being moved to Thursday to allow time to bypass the FFTs for E-port.

Entered: Sep 19 2012 10:15:12:353AM

Author: Chi Gao

MP 702(1nd part & 2nd part,0.5 run day): Cold pulse modulation experiments
SL: cgao
PO: hughes

This half run day is to complete MP 702.
We will have shots with steady density for 0.8MA and 1.1MA with CaF2 injection from 0.6 - 1.4s, 10Hz.
We will have shots with density ramping up/down with CaF2 injection from 0.6 - 1.4s, 10Hz.

put 1.5 psi Ar in B-SIDE-LOWER at 0.3s for 200ms for HIREX-Sr

Target plasma: LSN
nl04: varies under different current (see below for details)
Ip = 0.8-1.1MA. I would skip low current(0.55MA).
Bt = 5.45 T

================ Shot Plan ===============================================

(1) steady density with current scan: 8 shots
--(a)x2 Ip = 0.8MA, Bt = 5.4T nl04 ~ 0.80 ref: 1120106010
--(b)x2 Ip = 0.8MA, Bt = 5.4T nl04 ~ 0.40 ref: 1120106020
--(c)x2 Ip = 1.1MA, Bt = 5.4T nl04 ~ 1.20 ref: 1120720021
--(d)x2 Ip = 1.1MA, Bt = 5.4T nl04 ~ 0.60 ref: 1120720019

(2) 2-3 shots. Locked mode try. This part will be tough.ref: try from seg 4 of 1120830005.

q95 ~ 3.6/I(MA) at 5.45T

(3) 3 shots. Ip = 0.8MA, Bt = 5.45T (q95~4.5).
--(a)nl_04 rampup from 0.3 to 0.6e20 /m^2 from 0.5 to 1.6s Ref: 1120106025.
--(b)repeat(a) if rotation reversal happens and LBO is ok. Otherwise increase the density by 20% and adjust the LBO.
--(c)nl_04 rampdown.

(4) 2 shots. Ip = 1.1MA, Bt = 5.45T (q95~3.3).
--(a)nl_04 rampup from 0.5 to 0.8e20 /m^2 from 0.5 to 1.6s.
--(b)nl_04 rampdown.

if time permits........................................................
(5) 2 shots. Ip = 0.9MA, Bt = 5.45T (q95~4.0).
--(a)nl_04 rampup from 0.4 to 0.7e20 /m^2 from 0.5 to 1.6s.
--(b)nl_04 rampdown. ref: 1100317032

(6) 2 shots. Ip = 1.0MA, Bt = 5.45T (q95~3.6).
--(a)nl_04 rampup from 0.4 to 0.7e20 /m^2 from 0.5 to 1.6s.
--(b)nl_04 rampdown.

================ Required Diagnostics ==================================
HiReX-Sr PCI, GPI, FRCECE, GPC, GPC2, core and edge Thomson, reflectormeter, TCI, XEUS/LoWEUS

Physics Operators Plans

Entered: Sep 18 2012 10:20:18:357PM

Author: Jerry Hughes

PO Plan for 1120919
MP702 (SL = C. Gao)

-----------------
Engineering Setup
-----------------

Run begins between 11:00 and 13:00 and ends by 17:00

Power systems as on: 1120907028

Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled

Gas setup:

Fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1.5 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)
leave H-bottom as is DISABLED (PG5)
leave B-div as is Hybrid DISABLED (PG6)
leave H-div as is Hybrid DISABLED (PG7)
leave NINJA F-port as is DISABLED
leave NINJA C-port as is DISABLED

Enable gate-valves and shutters: ECE, VUV, HiREX Sr, Xeus/LoWEUS
Leave z-bolo shutter as is (should be open)

Torvac gatevalve toggle (yes/no): no

Boronization(yes/no): no
Overnight ECDC (yes/no): yes
ICRF(yes/no): no
LH(yes/no): no
Cryopump (yes/no): may be requested, but not for first shot
DNB (yes/no): no
LBO required, with CaF

Vessel temperature: 35/35/35

------------------------------
ECDC Parameters
------------------------------
gas and pressure: D2 at 2e-4 Torr
sweep: 44/45/103 cm
scan: 20/120 s

-------------------------------
Shot plan
------------------------------

Load from 1120907028 and tweak program according to SL's wishes.
He wants to ramp density and scan current, and inject CaF into it.

Session Leader Summaries

Entered: Sep 19 2012 05:19:34:823PM

Author: Chi Gao

Run summary of 1120919 (MP702)

We had 23 shots today(#1-#23)

4 no power shots: #5, #6, #7, #8
7 disruptions: #3(0.8s), #9(0.4s), #10(0.8s), #17(0.17s), #19(0.59s),#20(0.63s) , #21(0.69s)
1 fizzle: #4
11 full plasmas: #1,#2,#11,#12,#13,#14, #15, #16, #18, #22, #23

Of them #1,#12,#14,#15,#16, #18, #23 are good shots for analysis.

(I would name LBO target size {1,2,3,4} in ascending order)

(1) Ip = 0.8MA.
#1: nl04=0.8. size=3. Good SOC and pure diffusion. HiReX module 3 dead.
#2: nl04=0.4. size=2. LOC but LBO too small.
#11: nl04=0.4. size=2. LOC but LBO too small.
#12: nl04=0.4. size=3. Good LOC. non-diffusive.

(2) Ip = 1.1MA.
#13: nl04=0.5. size=3. Good LOC. non-diffusive
#14: nl04=0.5. size=3. Good LOC. non-diffusive. no injection at 0.8s and 0.9s
#15: nl04=0.5. size=3. Good LOC. non-diffusive. no injection at 1.2s
#16: nl04=0.7. size=3. Good LOC. non-diffusive.
#18: nl04=0.7. size=4. Good LOC. non-diffusive.

(3) Ip = 0.55MA.
#22: nl04=0.4. size=3. Density not steady. LBO is small. missed injection at 1.2s and 1.3s
#23: nl04=0.4. size=3. steady density. LBO reached the limit: 6 injections from 0.6s - 1.1s . Some strage response of core Te...

A lot of data to analysis.

Physics Operator Summaries

Entered: Sep 19 2012 05:28:14:217PM

Author: Jerry Hughes

Today we scanned Ip and nl04 shot by shot in order to get Chi Gao some
more cold pulse data from CaF injections. We planned to run about 1/2
day of this experiment, and had a late start to allow the RF team to
work on the E-port FFT bypass. First plasma was shortly after 10:00.

A significant machine issue was a failed capacitor in the EF1 power
supply. Diagnosing this and replacing the unit resulted in about 2.5
hours of lost time. Later in the day there was a data system hang
which was not uncommonly long. But by starting early we were able
squeeze in pretty much the full half day of run time.

Startup was generally well-behaved, except for a few late bounces here
and there.

We got full length flattops at 1.1, 0.8 and 0.55MA, with nl04 ranging
from 0.4 to 0.7e20. Heavy Ar seeding for Hirex Sr was not feasible at
the lowest current, and low density. It led to high radiation, and
early disruptions (see shots 19--21).

Final tally---
Fizzles = 1
Disruption in ramp-up = 1
Disruptions in flattop = 6
Plasmas into rampdown = 11
No power shots = 4

Session Leader Comments

Sep 19 2012 08:44:06:307AM Chi Gao Seems the run will begin earlier than expected. RF work is done. Wait for DNB group for some test.

Sep 19 2012 10:50:02:570AM 1120919001 Chi Gao We revised the shot plan. Begin with steady density part.

plan: 5.4T, 0.8MA, nl04=0.8.
result: good. Good SOC and pure diffusion. HiReX module 3 dead. LBO group said the current injection size cannot last half day. so we decrease the size from next shot.

Next: 5.4T, 0.8MA, nl04=0.4. with smalled injection shot.

Sep 19 2012 11:06:20:470AM 1120919002 Chi Gao
plan: 5.4T, 0.8MA, nl04=0.4.
result: Not much temperature perturbation in the core. Increase the target size.

Next: 5.4T, 0.8MA, nl04=0.3. with medium target size

Sep 19 2012 11:06:07:047AM 1120919003 Chi Gao
plan: 5.4T, 0.8MA, nl04=0.3.
result: Disruption. runaways.

Next: 5.4T, 0.8MA, nl04 goes back to 0.4

Sep 19 2012 11:08:23:647AM 1120919004 Chi Gao plan: 5.4T, 0.8MA, nl04=0.4.
result: post-disruption fizzle

Next: repeat

Sep 19 2012 11:18:48:407AM 1120919005 Chi Gao plan: 5.4T, 0.8MA, nl04=0.4.
result: no power

Next: repeat

Sep 19 2012 11:44:22:590AM 1120919006 Chi Gao plan: 5.4T, 0.8MA, nl04=0.4.
result: no power

Next: Test shot for troubleshooting the power problem. Disabled LBO

Sep 19 2012 01:44:47:870PM 1120919007 Chi Gao test shot

Sep 19 2012 01:44:51:640PM 1120919008 Chi Gao test shot

Sep 19 2012 01:49:13:857PM 1120919009 Chi Gao plan: 5.4T, 0.8MA, nl04=0.4.
result: disruption at 0.42s. Steve said it's a locked mode disruption. But this is not long enough for HiReX calibration...

Next: repeat

Sep 19 2012 02:14:32:450PM 1120919011 Chi Gao plan: 5.4T, 0.8MA, nl04=0.4.
result: good shot. LBO still a little small. edge deltaTe ~ 100eV. increase LBO target size.

Next: repeat with larger target size

Sep 19 2012 02:30:34:820PM 1120919012 Chi Gao plan: 5.4T, 0.8MA, nl04=0.4.
result: good shot. LOC. Core Te increase. edge delta_Te ~ 150eV. increase LBO target size.

Next: 5.4T. 1.1MA. nl04 ~ 0.5

Sep 19 2012 05:03:54:440PM 1120919013 Chi Gao plan: 5.4T, 1.1MA, nl04=0.5.
result: good LOC shot. core Te increase and non-pure diffusive.

Next: repeat.

Sep 19 2012 03:07:16:087PM 1120919014 Chi Gao plan: 5.4T, 1.1MA, nl04=0.5.
result: very good LOC shot. obvious core Te increase and non-pure diffusive. But we missed the LBO injection at 0.8s&0.9s. repeat

Next: repeat.

Sep 19 2012 03:12:55:113PM 1120919015 Chi Gao plan: 5.4T, 1.1MA, nl04=0.5.
result: very good LOC shot. obvious core Te increase and non-pure diffusive. But we missed the LBO injection at 1.2s. Go to higher density

Next: 5.4T, 1.1MA, nl04=0.7

Sep 19 2012 03:25:50:353PM 1120919016 Chi Gao plan: 5.4T, 1.1MA, nl04=0.7
result: very good LOC shot. core Te increase and non-pure diffusive. We will repeat with increased LBO target size(cell access needed)

Next: repeat

Sep 19 2012 03:35:16:130PM 1120919017 Chi Gao plan: 5.4T, 1.1MA, nl04=0.7
result:disruption at 0.17s

Next: repeat

Sep 19 2012 03:53:11:807PM 1120919018 Chi Gao plan: 5.4T, 1.1MA, nl04=0.7
result: good LOC. non-pure diffusive

Next: 5.4T, 0.55MA, nl04 ~ 0.4

Sep 19 2012 04:03:41:317PM 1120919019 Chi Gao plan: 5.4T, 0.55MA, nl04 ~ 0.4
result: disruption at 0.59s

Next: repeat

Sep 19 2012 04:43:01:653PM 1120919021 Chi Gao plan: 5.4T, 0.55MA, nl04 ~ 0.4
result: disruption at 0.7s. locked? no

Next: repeat with argon turned off.

Sep 19 2012 05:00:08:100PM 1120919022 Chi Gao plan: 5.4T, 0.55MA, nl04 ~ 0.4. Argon disabled
result: Full plasma (so the disruptions came from Ar?..). Density is not flat. LBO is small. Increase it next shot.

Next: repeat. Argon disabled.

Physics Operator Comments

Sep 18 2012 10:24:08:787PM Jerry Hughes
Chi is calling for LSN shots and provides reference discharges for the Ip and
density targets. His prior shots were on 1120106 and 1120720. Looking for
recent discharges with similar shaping, I find fairly close matches on 1120917,
1120907. If I load 1120907028 and change the current and field, I should have
a reasonably close target shot.

Load from 1120907028. Seg 2 is active.
Reduce IP to 8e5 A
Reduce TF to 153000 A
PG3 at 100V from 0.3s to 0.5s (This will be Ar)
Program nl04 ramp from 0.3 to 0.7e20 over the span of 0.5 to 1.5s.

Now import startup from previous day.
Seg 1 of 1120918001 --> Seg 1

Finally, Chi recommends a locked mode to try:
Import seg 4 of 1120830005 into seg 4. (leave seg off)

Load at 18-Sep-2012 22:23:32.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Sep 19 2012 10:03:05:663AM 1120919001 Jerry Hughes Search is on, and we may begin ops in 15--30 mins.

Sep 19 2012 10:27:45:817AM 1120919001 Jerry Hughes Shot 1.

Last moment change from SL. We will try steady density instead.
Set nl04 in SEG2 to 8e19 flat.

This jumps straight to part 6(c) of the SL plan!

Load at 19-Sep-2012 10:10:41.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Ask for B-side lower to be enabled.

Result: Plasma to 1.7s.
PLC reads Ar in B-side lower and Chi reports good Ar signal. However,
gas_scope_dpcs.dat is reading 2.25psi Ne --- yesterday's gas settings.
It also is reading H-bottom from yesterday!

Sep 19 2012 10:41:22:507AM 1120919002 Jerry Hughes Shot 2.

PO change:
Set nl04 in Seg2 to 4e19. Part 6(d) of SL plan.

Load at 19-Sep-2012 10:31:14.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Cell access for HirexSr.

Result: Plasma to 1.65s. Density is approximately what was targeted, and rising slightly.
Gas scope still reads the wrong gas fills on B-side lower and H-bottom.

Sep 19 2012 11:03:00:320AM 1120919003 Jerry Hughes Shot 3.

SL requests lower density.

Set nl04 in Seg 2 to 3e19.
Keep pump off for now.

Load at 19-Sep-2012 10:47:20.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Result: Dies early, at 0.95s, following a buildup of excess fueling, radiation.
Modest amounts of hards seen throughout.

On the bright side, Joe and Yuri have fixed the data logging from PLC to
MDS+, and now the gas scope reads the correct plenum fills.

Sep 19 2012 11:06:22:833AM 1120919004 Jerry Hughes Shot 4

PO change:

In seg 2 return nl04 to 4e19 during flattop

Load at 19-Sep-2012 11:01:01.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Result: Fizzle. I'll blame it on the disruption.

Sep 19 2012 11:30:00:403AM 1120919005 Jerry Hughes Shot 5.

No PO changes.

Result:
EF1 CB appeared to fail to charge in CHECK.

no-power

Bill Cochran has inspected and says go ahead with next shot.

Sep 19 2012 11:33:47:817AM 1120919006 Jerry Hughes Shot 6.

Retry, no changes.

Result:
Another problem with EF1 voltage readout during CHECK.
No power shot.

Sep 19 2012 11:54:27:747AM 1120919007 Jerry Hughes Some tests cycles are needed before we try for plasma again.

Stay tuned . . .

Could be awhile. There are concerns of a bad capacitor in the EF1 supply.

Sep 19 2012 12:04:46:267PM 1120919008 Jerry Hughes It's confirmed that a cap needs to be replaced. There will be a continued delay.

Sep 19 2012 12:55:20:020PM 1120919008 Jerry Hughes Expecting to start again in ~1/2 hour.

Sep 19 2012 01:30:43:187PM 1120919008 Jerry Hughes Locking up again.

Sep 19 2012 01:32:59:720PM 1120919008 Jerry Hughes Shot 8 will be a cycle test.

Sep 19 2012 01:47:51:460PM 1120919009 Jerry Hughes Shot 9.

Attempt another plasma.

Result: Disruption at 0.42s. Apparently it was locked.

Sep 19 2012 02:01:28:763PM 1120919010 Jerry Hughes Shot 10.

PO changes:

Increase nl04 in Seg 4 prior to 0.5s. Also, extended PG3 puff at t=0 slightly,
because I am still nervous about hards.

Result: Disrupts at 0.8 after a long locked mode. My increase in puff and nl04 demand did little to increase density.
Chi says he can use this to calibrate HSr. Check off #5 on the SL plan!

Sep 19 2012 02:14:59:687PM 1120919011 Jerry Hughes Shot 11

PO changes:

In Seg 1 extend PG3 backporch to 40ms.
Also bump up the nl04 demand around 0.3s and up the prop gain.

Load at 19-Sep-2012 14:07:20.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Result: Back to full length flattop. Disrupts at 1.75s.
Density is spot on target. Good shot.

Sep 19 2012 02:30:56:883PM 1120919012 Jerry Hughes Shot 12

No PO changes

Result: Good repeat of shot 11.

Sep 19 2012 02:45:55:263PM 1120919013 Jerry Hughes Shot 13.

PO changes:
In Seg 2 increase IP to 1.1e6. Increase flattop nl04 demand to 5e19.

Load at 19-Sep-2012 14:34:18.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Result: Runs to 1.75s. Density is flat.
Startup has a nasty bounce, but it recovered.

Sep 19 2012 02:56:12:483PM 1120919014 Jerry Hughes Shot 14

No PO changes.

Result: Into rampdown.
Startup still has a bounce, though later and not as severe.

Sep 19 2012 03:09:58:837PM 1120919015 Jerry Hughes Shot 15

No PO changes

Result: Plasma into rampdown.
Startup is looking much better.

Sep 19 2012 03:30:18:450PM 1120919016 Jerry Hughes Shot 16.

SL requests density increase

In Seg 2, increase flattop nl04 to 7e19.

Load at 19-Sep-2012 15:13:13.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Result: Into rampdown. Good startup.

Sep 19 2012 03:43:22:520PM 1120919017 Jerry Hughes Shot 17.

No PO changes.

Result: Disruption at 0.18s. Its origins seem to come earlier, as startup is bouncy, and current rise is slower.

Sep 19 2012 03:51:20:977PM 1120919018 Jerry Hughes Shot 18

PO changes:

In Seg 1, bring backporch of PG3 puff back to 30ms from 40ms.

Load at 19-Sep-2012 15:43:42.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Result: Clone of shot 16

Sep 19 2012 04:08:46:417PM 1120919019 Jerry Hughes Shot 19

PO changes:
In Seg 2, IP to 5.5e5
nl_04 to 4e19 in flattop

Load at 19-Sep-2012 15:56:57.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Result: Disrupts at 0.59s.

Sep 19 2012 04:16:52:697PM 1120919020 Jerry Hughes Shot 20

Make slight change to nl04 demand at 0.3s.

Load at 19-Sep-2012 16:08:59.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Result: Disrupts, same as last. High radiation build-up leading up.
SL agrees to cut the Ar for the next shot.

Sep 19 2012 04:40:55:940PM 1120919021 Jerry Hughes Shot 21.

PO change:

Reduce PG1 (Ar) in Seg 2 to 100ms.

Load at 19-Sep-2012 16:18:57.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Result: Disrupts at 0.69s. Still very radiative.

Sep 19 2012 05:00:15:047PM 1120919022 Jerry Hughes Shot 22.

Retry 21 with B-side-lower disabled.

result: The longest plasma today: 1.94s
Density overshoots to far, and there's not a good even flattop.

Sep 19 2012 05:11:37:757PM 1120919023 Jerry Hughes Shot 23

Changes:
In Seg 2, reduce nl_04 demand at 0.3s to try to cut back on the overshoot.

Load at 19-Sep-2012 16:58:45.00
Open tree /home/jwhughes/physop/pcs_scratch -1
Open tree done

Keep B-side-lower disabled.

Result: Full length again. Decent density trace.
LBO is almost out of spunk.

Run is over

Engineering Operator Comments

Shot Time Type Status Comment

1 10:16:21:153AM Plasma Ok

2 10:35:28:040AM Plasma Ok

3 10:48:32:557AM Plasma Ok

4 11:01:35:457AM Plasma Ok

5 11:13:58:580AM Plasma Bad EF1U cap bank failed to charge in check state

6 11:29:55:273AM Plasma Bad EF1U Cap Bank Not Showing Charged

7 11:45:19:130AM Test Bad EF1U Cap Bank Test

8 01:33:25:977PM Test Ok

9 01:41:18:603PM Plasma Bad OH1 Flt

10 01:54:40:727PM Plasma Ok

11 02:08:22:937PM Plasma Ok

12 02:20:57:793PM Plasma Ok

13 02:35:03:717PM Plasma Ok

14 02:50:43:133PM Plasma Ok

15 03:03:58:550PM Plasma Ok

16 03:17:21:320PM Plasma Ok

17 03:31:42:400PM Plasma Ok

18 03:44:37:833PM Plasma Ok

19 03:58:43:987PM Plasma Ok

20 04:12:03:507PM Plasma Ok

21 04:24:34:437PM Plasma Ok

22 04:52:06:237PM Plasma Ok

23 05:04:11:513PM Plasma Ok

System Availability

Sep 19 2012 10:16:00:850AM

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

Sep 19 2012 11:19:08:993AM

EF1 Upper capicitor bank failed to charge in "Check State"

Session Leader Comments
Sep 19 2012 08:44:06:307AM		Chi Gao	Seems the run will begin earlier than expected. RF work is done. Wait for DNB group for some test.
Sep 19 2012 10:50:02:570AM	1120919001	Chi Gao	We revised the shot plan. Begin with steady density part. plan: 5.4T, 0.8MA, nl04=0.8. result: good. Good SOC and pure diffusion. HiReX module 3 dead. LBO group said the current injection size cannot last half day. so we decrease the size from next shot. Next: 5.4T, 0.8MA, nl04=0.4. with smalled injection shot.
Sep 19 2012 11:06:20:470AM	1120919002	Chi Gao	plan: 5.4T, 0.8MA, nl04=0.4. result: Not much temperature perturbation in the core. Increase the target size. Next: 5.4T, 0.8MA, nl04=0.3. with medium target size
Sep 19 2012 11:06:07:047AM	1120919003	Chi Gao	plan: 5.4T, 0.8MA, nl04=0.3. result: Disruption. runaways. Next: 5.4T, 0.8MA, nl04 goes back to 0.4
Sep 19 2012 11:08:23:647AM	1120919004	Chi Gao	plan: 5.4T, 0.8MA, nl04=0.4. result: post-disruption fizzle Next: repeat
Sep 19 2012 11:18:48:407AM	1120919005	Chi Gao	plan: 5.4T, 0.8MA, nl04=0.4. result: no power Next: repeat
Sep 19 2012 11:44:22:590AM	1120919006	Chi Gao	plan: 5.4T, 0.8MA, nl04=0.4. result: no power Next: Test shot for troubleshooting the power problem. Disabled LBO
Sep 19 2012 01:44:47:870PM	1120919007	Chi Gao	test shot
Sep 19 2012 01:44:51:640PM	1120919008	Chi Gao	test shot
Sep 19 2012 01:49:13:857PM	1120919009	Chi Gao	plan: 5.4T, 0.8MA, nl04=0.4. result: disruption at 0.42s. Steve said it's a locked mode disruption. But this is not long enough for HiReX calibration... Next: repeat
Sep 19 2012 02:14:32:450PM	1120919011	Chi Gao	plan: 5.4T, 0.8MA, nl04=0.4. result: good shot. LBO still a little small. edge deltaTe ~ 100eV. increase LBO target size. Next: repeat with larger target size
Sep 19 2012 02:30:34:820PM	1120919012	Chi Gao	plan: 5.4T, 0.8MA, nl04=0.4. result: good shot. LOC. Core Te increase. edge delta_Te ~ 150eV. increase LBO target size. Next: 5.4T. 1.1MA. nl04 ~ 0.5
Sep 19 2012 05:03:54:440PM	1120919013	Chi Gao	plan: 5.4T, 1.1MA, nl04=0.5. result: good LOC shot. core Te increase and non-pure diffusive. Next: repeat.
Sep 19 2012 03:07:16:087PM	1120919014	Chi Gao	plan: 5.4T, 1.1MA, nl04=0.5. result: very good LOC shot. obvious core Te increase and non-pure diffusive. But we missed the LBO injection at 0.8s&0.9s. repeat Next: repeat.
Sep 19 2012 03:12:55:113PM	1120919015	Chi Gao	plan: 5.4T, 1.1MA, nl04=0.5. result: very good LOC shot. obvious core Te increase and non-pure diffusive. But we missed the LBO injection at 1.2s. Go to higher density Next: 5.4T, 1.1MA, nl04=0.7
Sep 19 2012 03:25:50:353PM	1120919016	Chi Gao	plan: 5.4T, 1.1MA, nl04=0.7 result: very good LOC shot. core Te increase and non-pure diffusive. We will repeat with increased LBO target size(cell access needed) Next: repeat
Sep 19 2012 03:35:16:130PM	1120919017	Chi Gao	plan: 5.4T, 1.1MA, nl04=0.7 result:disruption at 0.17s Next: repeat
Sep 19 2012 03:53:11:807PM	1120919018	Chi Gao	plan: 5.4T, 1.1MA, nl04=0.7 result: good LOC. non-pure diffusive Next: 5.4T, 0.55MA, nl04 ~ 0.4
Sep 19 2012 04:03:41:317PM	1120919019	Chi Gao	plan: 5.4T, 0.55MA, nl04 ~ 0.4 result: disruption at 0.59s Next: repeat
Sep 19 2012 04:43:01:653PM	1120919021	Chi Gao	plan: 5.4T, 0.55MA, nl04 ~ 0.4 result: disruption at 0.7s. locked? no Next: repeat with argon turned off.
Sep 19 2012 05:00:08:100PM	1120919022	Chi Gao	plan: 5.4T, 0.55MA, nl04 ~ 0.4. Argon disabled result: Full plasma (so the disruptions came from Ar?..). Density is not flat. LBO is small. Increase it next shot. Next: repeat. Argon disabled.

Physics Operator Comments
Sep 18 2012 10:24:08:787PM		Jerry Hughes	Chi is calling for LSN shots and provides reference discharges for the Ip and density targets. His prior shots were on 1120106 and 1120720. Looking for recent discharges with similar shaping, I find fairly close matches on 1120917, 1120907. If I load 1120907028 and change the current and field, I should have a reasonably close target shot. Load from 1120907028. Seg 2 is active. Reduce IP to 8e5 A Reduce TF to 153000 A PG3 at 100V from 0.3s to 0.5s (This will be Ar) Program nl04 ramp from 0.3 to 0.7e20 over the span of 0.5 to 1.5s. Now import startup from previous day. Seg 1 of 1120918001 --> Seg 1 Finally, Chi recommends a locked mode to try: Import seg 4 of 1120830005 into seg 4. (leave seg off) Load at 18-Sep-2012 22:23:32.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done
Sep 19 2012 10:03:05:663AM	1120919001	Jerry Hughes	Search is on, and we may begin ops in 15--30 mins.
Sep 19 2012 10:27:45:817AM	1120919001	Jerry Hughes	Shot 1. Last moment change from SL. We will try steady density instead. Set nl04 in SEG2 to 8e19 flat. This jumps straight to part 6(c) of the SL plan! Load at 19-Sep-2012 10:10:41.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Ask for B-side lower to be enabled. Result: Plasma to 1.7s. PLC reads Ar in B-side lower and Chi reports good Ar signal. However, gas_scope_dpcs.dat is reading 2.25psi Ne --- yesterday's gas settings. It also is reading H-bottom from yesterday!
Sep 19 2012 10:41:22:507AM	1120919002	Jerry Hughes	Shot 2. PO change: Set nl04 in Seg2 to 4e19. Part 6(d) of SL plan. Load at 19-Sep-2012 10:31:14.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Cell access for HirexSr. Result: Plasma to 1.65s. Density is approximately what was targeted, and rising slightly. Gas scope still reads the wrong gas fills on B-side lower and H-bottom.
Sep 19 2012 11:03:00:320AM	1120919003	Jerry Hughes	Shot 3. SL requests lower density. Set nl04 in Seg 2 to 3e19. Keep pump off for now. Load at 19-Sep-2012 10:47:20.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Dies early, at 0.95s, following a buildup of excess fueling, radiation. Modest amounts of hards seen throughout. On the bright side, Joe and Yuri have fixed the data logging from PLC to MDS+, and now the gas scope reads the correct plenum fills.
Sep 19 2012 11:06:22:833AM	1120919004	Jerry Hughes	Shot 4 PO change: In seg 2 return nl04 to 4e19 during flattop Load at 19-Sep-2012 11:01:01.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Fizzle. I'll blame it on the disruption.
Sep 19 2012 11:30:00:403AM	1120919005	Jerry Hughes	Shot 5. No PO changes. Result: EF1 CB appeared to fail to charge in CHECK. no-power Bill Cochran has inspected and says go ahead with next shot.
Sep 19 2012 11:33:47:817AM	1120919006	Jerry Hughes	Shot 6. Retry, no changes. Result: Another problem with EF1 voltage readout during CHECK. No power shot.
Sep 19 2012 11:54:27:747AM	1120919007	Jerry Hughes	Some tests cycles are needed before we try for plasma again. Stay tuned . . . Could be awhile. There are concerns of a bad capacitor in the EF1 supply.
Sep 19 2012 12:04:46:267PM	1120919008	Jerry Hughes	It's confirmed that a cap needs to be replaced. There will be a continued delay.
Sep 19 2012 12:55:20:020PM	1120919008	Jerry Hughes	Expecting to start again in ~1/2 hour.
Sep 19 2012 01:30:43:187PM	1120919008	Jerry Hughes	Locking up again.
Sep 19 2012 01:32:59:720PM	1120919008	Jerry Hughes	Shot 8 will be a cycle test.
Sep 19 2012 01:47:51:460PM	1120919009	Jerry Hughes	Shot 9. Attempt another plasma. Result: Disruption at 0.42s. Apparently it was locked.
Sep 19 2012 02:01:28:763PM	1120919010	Jerry Hughes	Shot 10. PO changes: Increase nl04 in Seg 4 prior to 0.5s. Also, extended PG3 puff at t=0 slightly, because I am still nervous about hards. Result: Disrupts at 0.8 after a long locked mode. My increase in puff and nl04 demand did little to increase density. Chi says he can use this to calibrate HSr. Check off #5 on the SL plan!
Sep 19 2012 02:14:59:687PM	1120919011	Jerry Hughes	Shot 11 PO changes: In Seg 1 extend PG3 backporch to 40ms. Also bump up the nl04 demand around 0.3s and up the prop gain. Load at 19-Sep-2012 14:07:20.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Back to full length flattop. Disrupts at 1.75s. Density is spot on target. Good shot.
Sep 19 2012 02:30:56:883PM	1120919012	Jerry Hughes	Shot 12 No PO changes Result: Good repeat of shot 11.
Sep 19 2012 02:45:55:263PM	1120919013	Jerry Hughes	Shot 13. PO changes: In Seg 2 increase IP to 1.1e6. Increase flattop nl04 demand to 5e19. Load at 19-Sep-2012 14:34:18.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Runs to 1.75s. Density is flat. Startup has a nasty bounce, but it recovered.
Sep 19 2012 02:56:12:483PM	1120919014	Jerry Hughes	Shot 14 No PO changes. Result: Into rampdown. Startup still has a bounce, though later and not as severe.
Sep 19 2012 03:09:58:837PM	1120919015	Jerry Hughes	Shot 15 No PO changes Result: Plasma into rampdown. Startup is looking much better.
Sep 19 2012 03:30:18:450PM	1120919016	Jerry Hughes	Shot 16. SL requests density increase In Seg 2, increase flattop nl04 to 7e19. Load at 19-Sep-2012 15:13:13.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Into rampdown. Good startup.
Sep 19 2012 03:43:22:520PM	1120919017	Jerry Hughes	Shot 17. No PO changes. Result: Disruption at 0.18s. Its origins seem to come earlier, as startup is bouncy, and current rise is slower.
Sep 19 2012 03:51:20:977PM	1120919018	Jerry Hughes	Shot 18 PO changes: In Seg 1, bring backporch of PG3 puff back to 30ms from 40ms. Load at 19-Sep-2012 15:43:42.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Clone of shot 16
Sep 19 2012 04:08:46:417PM	1120919019	Jerry Hughes	Shot 19 PO changes: In Seg 2, IP to 5.5e5 nl_04 to 4e19 in flattop Load at 19-Sep-2012 15:56:57.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Disrupts at 0.59s.
Sep 19 2012 04:16:52:697PM	1120919020	Jerry Hughes	Shot 20 Make slight change to nl04 demand at 0.3s. Load at 19-Sep-2012 16:08:59.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Disrupts, same as last. High radiation build-up leading up. SL agrees to cut the Ar for the next shot.
Sep 19 2012 04:40:55:940PM	1120919021	Jerry Hughes	Shot 21. PO change: Reduce PG1 (Ar) in Seg 2 to 100ms. Load at 19-Sep-2012 16:18:57.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Disrupts at 0.69s. Still very radiative.
Sep 19 2012 05:00:15:047PM	1120919022	Jerry Hughes	Shot 22. Retry 21 with B-side-lower disabled. result: The longest plasma today: 1.94s Density overshoots to far, and there's not a good even flattop.
Sep 19 2012 05:11:37:757PM	1120919023	Jerry Hughes	Shot 23 Changes: In Seg 2, reduce nl_04 demand at 0.3s to try to cut back on the overshoot. Load at 19-Sep-2012 16:58:45.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Keep B-side-lower disabled. Result: Full length again. Decent density trace. LBO is almost out of spunk. Run is over

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	10:16:21:153AM	Plasma	Ok
2	10:35:28:040AM	Plasma	Ok
3	10:48:32:557AM	Plasma	Ok
4	11:01:35:457AM	Plasma	Ok
5	11:13:58:580AM	Plasma	Bad	EF1U cap bank failed to charge in check state
6	11:29:55:273AM	Plasma	Bad	EF1U Cap Bank Not Showing Charged
7	11:45:19:130AM	Test	Bad	EF1U Cap Bank Test
8	01:33:25:977PM	Test	Ok
9	01:41:18:603PM	Plasma	Bad	OH1 Flt
10	01:54:40:727PM	Plasma	Ok
11	02:08:22:937PM	Plasma	Ok
12	02:20:57:793PM	Plasma	Ok
13	02:35:03:717PM	Plasma	Ok
14	02:50:43:133PM	Plasma	Ok
15	03:03:58:550PM	Plasma	Ok
16	03:17:21:320PM	Plasma	Ok
17	03:31:42:400PM	Plasma	Ok
18	03:44:37:833PM	Plasma	Ok
19	03:58:43:987PM	Plasma	Ok
20	04:12:03:507PM	Plasma	Ok
21	04:24:34:437PM	Plasma	Ok
22	04:52:06:237PM	Plasma	Ok
23	05:04:11:513PM	Plasma	Ok