Alcator C-Mod Run 1060317 Information

Miniproposals

Miniproposal: 402

Date Filed: 1/14/2005

Title: Locked mode studies at different toroidal phase

First Author: Steve Wolfe

Session Leader: Steve Wolfe (shots 1-30)

Operators
Session leader(s):	Steve Wolfe
Physics operator(s):	Jim Irby
Engineering operator(s):	Andy Pfeiffer,Bill Byford

Engineering Operator Run Comment
Locked mode threshold at different toroidal phase SL Wolfe PO Irby EO Pi

Session Leader Plans

Entered: Mar 15 2006 05:50:01:240PM

Author: Steve Wolfe

Run plan for Fri. 17-Mar-2006 MP#402 Locked modes threshold at different toroidal phase SL: Wolfe PO: Irby This run will continue the phase scan of applied non-axisymmetric field orientation begun on 1050415. The purpose of these experiments is to improve our characterization of the C-Mod intrinsic error fields, and to investigate the dependence of the 2/1 locked mode threshold on the m=1 and m=3 sidebands. Last April we completed one phase condition, namely [-Bbot -Dtop +Gbot +Jtop], the so-called rotated helical configuration. This corresponds to condition 5A of the original MP. We will start today with the negative of this orientation, then proceed through the others more or less in the order of the MP. Start with A-coils connected as for 5B of the MP: [+Bbot +Dtop -Gbot -Jtop] phi~ +76 degrees 1) Establish shot with 1MA, 5.4T, NL04=1.15e20, Acoil off, like 1050415025. Verify that no intrinsic locked mode occurs. If it does, raise NL04 2. A) Program A-coil current to maximum (4000A program, expect 3600A) B) If locked mode appears on A, then reduce A-coil current to bracket the threshold. Otherwise reduce NL04 by 10% and try again [1-3shots] C) Set A-coil current to 1600A, trying for B21_app=4.4G. Ramp NL04 down after 0.8 sec during shot to look for locking density (as on 1050415030). Note that A-coil program needs to be set higher than actual value desired. The program from 1050415030 is probably a good place to start. 3. Change A-coil taps to [+Btop -Bbot -Gtop +Gbot] This is the rotated quadrupole configuration, phi~ -49deg. A) Return to density program of 2A&B. Program max A-coil current B) If locked mode appears on 3A, then reduce A-coil current to bracket the threshold. Otherwise reduce density 10% and try again (if not down to intrinsic threshold already) C) Set A-coil current to get 1660A (or whatever is needed to get B21_app=4.4G). Program NL04 ramp-down as on 2C. 4. Reverse A-coil power supply leads, so A-coil taps setting is [-Btop +Bbot +Gtop -Gbot] phi=+131 deg quadrupole A-C) Repeat the sequence of 2 and 3 5. If there is time remaining, proceed to the next case in the MP: [+Btop +Bbot -Gtop -Gbot] rotated dipole, phi=+38degrees A-C) Repeat the shot sequence of the previous phases Actually, I don't expect to be able to get a locked mode at NL04=1.15e20 in this orientation, but we might as well try. The A-coil current for step C (to get 4.4G) should be ~2900A 6. Reverse A-coil supply leads to give [-Btop -Bbot +Gtop +Gbot] rotated dipole, phi=-142deg A-C) Repeat shot sequence of the previous phases. Program current for step C should be same as determined for 5C to give 4.4G It's highly unlikely we'll get this far, but if we should the next tap setting would be a standard dipole [+Dtop +Dbot -Jtop -Jbot]

Physics Operators Plans

Session Leader Summaries

Entered: Mar 17 2006 06:10:14:127PM

Author: Steve Wolfe

Run summary for 1060317 MP#402 Locked mode threshold at different toroidal phase SL: wolfe PO: Irby EO: Pfeiffer, Byford We got a number of new points on for the database, which should help refine the intrinsic error field determination. We completed steps 1-4 of the run plan, and got a solid null result on 5A/B; the locking density in configuration 5 was not determined, but it is probably more important to move on to the next configuration when we get another run day, as the rotated dipole in quad 1 ends up in a very stable region and I expect the locking density may be too low to access. 2. We started with the anti-rotated helical configuration [+Bbot +Dtop -Gbot -Jtop] which is 180deg from the configuration used on 1050415, the first half-day of this MP. We got only a lower bound on the 2e20/m^3 threshold field at |B21_app|> 10.4G at phi~ +76deg. (shot 4,5). The locking density at |B21_app|=4.7G was nebar~1.1e20/m^3 (shot 8) 3. The rotated quadrupole configuration [+Btop -Bbot -Gtop +Gbot] has phi=-49deg, essentially orthogonal to the standard configuration. For this orientation we got a threshold |B21_app| <= 10.0G at about 1.4sec (shot 11) The locking density at 4.5G was 1.44e20/m^3 (shot 14) 4. A good sequence of points was obtained in the opposite (3rd) quadrant with [-Btop +Bbot +Gtop -Gbot], isolating the threshold (nebar=2e20) at 3.9 < |B21_app| < 5.4G (shot 24,25) The locking density at 4.6G was 1.44e20/m^3 (Shot#16) 5. No locked mode obtained at max current with rotated dipole [+Btop +Bbot -Gtop -Gbot] phi=38deg |B21_app|=4.5G We were unable to get a shot to locate the locking density, which is expected to be very low. Circle plot including 2e20/m^3 data points from 1050415 and today, with intrinsic model center, and circle at 5G/e20 (all today's points "by hand"; may change some with further analysis) is shown below. Green points unlocked, red triangles locked.

Physics Operator Summaries

Entered: Mar 17 2006 05:42:26:950PM

Author: Jim Irby

A PO error on shot 01 resulted in a disruption at 0.7 s. I zeroed the NL04 predictor by accident. Shot 02 was a no power test.

We certainly had problems with fizzles and a few duds today. These problems seemed to be cured mostly by adjustments to bz0 and a general trend downward in the prefill pulsewidth.

The E-Left vertical leg cooling slowed us down during the first half of the run, but a change in the cooling setup to lower pump pressure and manual operation kept us below 10 minutes the rest of the run. This issue will be investigated more on Monday.

test 02

PS prob 29

duds 09,10,28

fizzles 07,12,17,19,21,27

plasmas 01,03,04,05,06,08,11,13,14,15
16,18,20,22,23,24,25,26,30

Session Leader Comments

Mar 17 2006 09:18:08:263AM 1060317001 Steve Wolfe
Shot#1: Bad runaways early disruption at 0.7sec TCI looks noisy.

Mar 17 2006 09:48:47:030AM 1060317002 Steve Wolfe
Shot#1 looked like there was no nl04 signal, but it's there. Jim seems to have zeroed the nl04 predictor. Re-do the load from scratch for shot#2: Load from 1060317018 Import seg2 from 1050415025 Recalculate ONLY THE MAGNETICS PREDICTORS: Wires 1-8, and 16.

Mar 17 2006 09:59:28:013AM 1060317003 Steve Wolfe
Shot#3: plasma to 1.7sec. ECE gate valve was closed, but I'm pretty sure there's no locked mode. Nebar~2.1e20. Next shot: Acoil on full current

Mar 17 2006 10:17:32:483AM 1060317004 Steve Wolfe
Shot#4: Acoil at 3500A, ECE signal not there yet EFIT didn't run. No locked mode, reduce NL04 to 1.0e20 and try again. B21_app=10.4G

Mar 17 2006 10:27:24:827AM 1060317005 Steve Wolfe
Shot#5: NL04 to 1.0e20; Acoil still at 4000 program Still no locked mode. Drop it to 0.8 for next shot. If that doesn't work, move on to "C"

Mar 17 2006 10:41:02:403AM 1060317006 Steve Wolfe
Shot#6: NL04 to 0.8e20; Acoil program still at 4000. Maybe locks in rampdown, around 1.57sec. Move on to Step 2C: Density in free-fall after 0.8sec, Acoil demand at 2000A.

Mar 17 2006 10:53:48:327AM 1060317007 Steve Wolfe
Shot#7: Move on to Step 2C: Density in free-fall after 0.8sec, Acoil demand at 2000A. Fizzle.

Mar 17 2006 11:28:13:640AM 1060317008 Steve Wolfe
Shot#8: Move on to Step 2C: Density in free-fall after 0.8sec, Acoil demand at 2000A. plasma to 1.65sec. Locked mode at 1.37sec, nl04=6.0e19, 4.7G on A-coil (1760A). Nebar=1.07e20, Btot(Model)=4.7G Compare 1050415030: NL04=0.95 at 4.4G (app), phi_a=-104deg. Let's move on 3A: [+Btop -Bbot -Gtop +Gbot]

Mar 17 2006 11:41:38:107AM 1060317009 Steve Wolfe
Shot#9: move on 3A: [+Btop -Bbot -Gtop +Gbot],NL04 back to 1.2e20, Acoil cur program back to 4000A. Dud.

Mar 17 2006 11:53:20:810AM 1060317010 Steve Wolfe
Shot#10: move on 3A: [+Btop -Bbot -Gtop +Gbot],NL04 back to 1.2e20, Acoil cur program back to 4000A. Dud

Mar 17 2006 12:15:59:840PM 1060317011 Steve Wolfe
Shot#10: move on 3A: [+Btop -Bbot -Gtop +Gbot],NL04 back to 1.2e20, Acoil cur program back to 4000A. plasma, some runaways -Locks around 1.4sec, nebar=1.95e20 ? B21_app=10.0G =(7.5,-6.5) Btot(model) = 9.7G Next shot: Drop NL04 to 1.0e20 to try to get it to lock earlier.

Mar 17 2006 12:21:55:403PM 1060317012 Steve Wolfe
Shot#11: Drop NL04 to 1.0e20 to try to get it to lock earlier. fizzle

Mar 17 2006 12:42:04:483PM 1060317013 Steve Wolfe
Shot#12: Drop NL04 to 1.0e20 to try to get it to lock earlier. plasma to 1.6sec, locks at 0.74sec, nebar=1.55e20. Well, that brackets it pretty well. Next: Part "C", density in free-fall after 0.8sec; Acoil prog to 1900A

Mar 17 2006 01:14:12:890PM 1060317014 Steve Wolfe
Shot#13: Part "3C", density in free-fall after 0.8sec; Acoil prog to 1900A plasma to 1.65sec Locks at 1.3sec,nebar=1.35 (nl4=7.5e19) but field is too low; Bapp=3.3G ? Acoil was programmed to 1600 and got 1280. We want 1700, so program 2000, I think.

Mar 17 2006 01:29:00:763PM 1060317015 Steve Wolfe
Shot#15: Part "3C", density in free-fall after 0.8sec; Acoil prog to 2000A plasma to 1.6 Locks at 1.23sec, nl04=8e19, nebar=1.44e20, B21_app=4.5G. Move to Case 4: Reverse leads to give [-Btop +Bbot +Gtop -Gbot] We'll leave the current and density program as is, so next shot will be case 4C; then go back up in density and current to get parts A and B

Mar 17 2006 01:46:18:373PM 1060317016 Steve Wolfe
Shot#16: Reverse leads to give [-Btop +Bbot +Gtop -Gbot] Part "4C", density in free-fall after 0.8sec; Acoil prog to 2000A plasma. Locks at 1.19sec, nl04=7.7e19, nebar=1.44e20, B21app=4.6G Btot (Model)=8.5G

Mar 17 2006 01:57:28:983PM 1060317017 Steve Wolfe
Shot#17: 4A - NL04=1.2e20, Acoil Current to 4000 (prog) fizzle.

Mar 17 2006 02:17:42:043PM 1060317018 Steve Wolfe
Shot#18: 4A - NL04=1.2e20, Acoil Current to 4000 (prog) plasma to 1.5sec locks at 1.45 I think - lose sawteeth, jump on magnetics, but no density fall? Density at nl04=1.46e20.Nebar=2.6e20 B21_app=(-6.5,7.5) = 10G, btot(mod)=13.9G Next shot: drop nl04 to 1.1e20

Mar 17 2006 02:24:02:140PM 1060317019 Steve Wolfe
Shot#19:drop nl04 to 1.1e20 (ran high on 18) fizzle

Mar 17 2006 02:45:22:043PM 1060317020 Steve Wolfe
Shot#20:drop nl04 to 1.1e20 (ran high on 18) plasma, locked mode at .97sec, nl04=1.1, nebar=2.0e20 Next: Drop Acoil current from 4000 to 3300A (program)

Mar 17 2006 02:54:58:780PM 1060317021 Steve Wolfe
Shot#21: Drop Acoil current from 4000 to 3300A (program) fizzle.

Mar 17 2006 03:13:15:340PM 1060317022 Steve Wolfe
Shot#22: Drop Acoil current from 4000 to 3300A (program) plasma, locks at 1.23sec, b21_app=8.4G,nebar=2.05e20 B21_app=(-5.5,6.4) Next: drop acoil current from 3300A to 2800A (program)

Mar 17 2006 03:26:46:607PM 1060317023 Steve Wolfe
Shot#23: Drop Acoil current from 3300A to 2800A(program) plasma to 1.5sec lock at 1.27sec, nebar=2.06e20, B21=6.9G=(-4.7,5.3) Next: Acoil to 1800A, need to get a non-lock case

Mar 17 2006 03:43:18:687PM 1060317024 Steve Wolfe
Shot#24: Acoil to 1800A, need to get a non-lock case plasma to 1.66. No locked mode. B21_app=(-2.65,3.1)=3.9G {Is it consistent with 4.5G result?) Anyhow, that brackets it. Next go to 2300A (program) This one has a possible lock in rampdown, at 1.55sec.

Mar 17 2006 03:53:36:340PM 1060317025 Steve Wolfe
Shot#25: Acoil to 2300A plasma to 1.62sec Lock at 1.46sec, nebar=2.1e20, b21_app=(-3.7,4.25) Next: On to step 5A [+Btop +Bbot -Gtop -Gbot]

Mar 17 2006 04:17:31:920PM 1060317026 Steve Wolfe
Shot#26: Step 5A [+Btop +Bbot -Gtop -Gbot] Acoil=4000A program. NL04=1.1e20 program plasma. No locked mode. B21_app=4.5G = (3.6,2.8) Next: Do the density drop; I don't know if we can even get it low enough to lock in this direction with this spectrum.

Mar 17 2006 04:26:38:967PM 1060317027 Steve Wolfe
Shot#27: Do the density drop; Start from 8e19, free-fall after .8sec Acoil still at 4000 (program) to get |B21|=4.4G I don't know if we can even get nebar low enough to lock in this direction with this spectrum. Probably should have started with the negative sense of this case, but that will need to wait till next time. fizzle.

Mar 17 2006 04:38:51:793PM 1060317028 Steve Wolfe
Shot#28: Do the density drop; Start from 8e19, free-fall after .8sec Acoil still at 4000 (program) to get |B21|=4.5G dud

Mar 17 2006 04:50:55:217PM 1060317029 Steve Wolfe
Shot#29: Do the density drop; Start from 8e19, free-fall after .8sec Acoil still at 4000 (program) to get |B21|=4.5G No TF

Mar 17 2006 05:20:31:700PM 1060317030 Steve Wolfe
Shot#30: Last Try- Start from 8e19, free-fall after .8sec Acoil still at 4000 (program) to get |B21|=4.5G plasma to 0.6sec, disrupted before the density drop just after the start of the acoil pulse. Possible early locked mode??? There were some runaways and looks like an injection at.56sec, then it locks around .575 and there's a major injection at .599

Physics Operator Comments

Mar 17 2006 09:30:13:717AM Jim Irby loaded shot 1050415025 --- verfied only seg 1 and seg 2 were being used
loaded shot 1060316018 into seg 1
did recalc on all seg 2 lines
did a load/clean

Ip request is 1 MA
Bt 5.4 T
nl04 request is 1.2e20 /m^2

TF delay and fizzle back to normal --- no need for backporch

No A-Coil current for this shot --- see if we can get locked modes

plasma for 0.7 s --- lots of runaways

Mar 17 2006 12:16:57:700PM 1060317011 Jim Irby Just noticed my earlier entries were under TCI no PO

EF4 from -1325 to -1335 A
prefill to 30 ms from 28 ms

plasma into rampdown --- not a great startup but...

Mar 17 2006 12:31:41:077PM 1060317012 Jim Irby nl04 from 1.2 to 1.0e20/m^2

fizzle ---

Mar 17 2006 12:40:52:140PM 1060317013 Jim Irby prefill back to 28 ms

TF vert cooling from -182 to -184

vessel back to 35/35/35 from 20/20/20 folling this shot

plasma into rampdown --- startup much better

Mar 17 2006 01:08:45:450PM 1060317014 Jim Irby vessel at 35/35/35

nl04 ramped negative at 0.8 s from 1e20/m^2

A-Coils to 1600 A --- but Steve wanted 1900 A

plasma into rampdown

Mar 17 2006 01:27:00:530PM 1060317015 Jim Irby A-Coils to 2000 A

plasma into rampdown

Mar 17 2006 01:46:47:263PM 1060317016 Jim Irby repeat with new A-Coil configuration

plasma

Mar 17 2006 02:03:30:700PM 1060317017 Jim Irby nl04 request to 1.2e20 until 1.5 s
A-Coils to 4000 A

fizzle --- killed at 20 ms by ??

Mar 17 2006 02:16:33:763PM 1060317018 Jim Irby try again with no DPCS changes

plasma

Mar 17 2006 02:30:02:857PM 1060317019 Jim Irby pg1 from 50 to 60 ms starting at 0.3 s

nl04 from 1.2 to 1.1e20/m^2

fizzle

problems with data system

Mar 17 2006 02:45:33:390PM 1060317020 Jim Irby prefill from 28 to 26 ms

lost some data from last shot

plasma --- startup good

Mar 17 2006 03:00:43:937PM 1060317021 Jim Irby A-Coil current from 4000 to 3300 A

fizzle ---

Mar 17 2006 03:11:18:733PM 1060317022 Jim Irby prefill from 26 to 24 ms

plasma --- startup very good

Mar 17 2006 03:20:48:763PM 1060317023 Jim Irby A-Coil current to 2800 A

plasma

Mar 17 2006 03:33:34:077PM 1060317024 Jim Irby A-Coil current to 1800 A from 2800 A
prefill from 24 to 22 ms --- almost lost startup on shot 23

plasma --- startup better

Mar 17 2006 03:52:40:560PM 1060317025 Jim Irby A-Coil current to 2300 A

reduced prefill another ms to 21 ms

plasma --- breakdown a little later

Mar 17 2006 04:15:38:247PM 1060317026 Jim Irby Cell entry to change A-Coil configuration
A-Coil current to 4000 A

plasma ---

Mar 17 2006 04:29:35:420PM 1060317027 Jim Irby Drive density negative at 0.8 s starting from 8e19/m^2

fizzle --- spikes in CIII at .02 and .028 ms does in startup

Mar 17 2006 04:40:46:903PM 1060317028 Jim Irby no DPCS changes

dud --- Bz0?

Mar 17 2006 05:02:18:373PM 1060317029 Jim Irby EF4 from -1335 to -1345 A

no TF??

Mar 17 2006 05:20:50:840PM 1060317030 Jim Irby Try again with TF

disruption at 0.6 s

a few injections starting at .1 s could be boron
big injection at just before 0.6 s

Engineering Operator Comments

Shot Time Type Status Comment

1 09:13:52:780AM Plasma Ok

2 09:40:47:090AM Test Ok

3 09:52:52:700AM Plasma Ok

4 10:05:45:653AM Plasma Ok

5 10:20:31:687AM Plasma Ok

6 10:33:23:373AM Plasma Ok

7 10:52:03:530AM Plasma Ok

8 11:06:34:873AM Plasma Ok

9 11:39:02:513AM Plasma Ok

10 11:51:42:357AM Plasma Ok

11 12:06:35:043PM Plasma Ok

12 12:20:15:827PM Plasma Ok

13 12:37:23:030PM Plasma Ok

14 12:59:54:793PM Plasma Ok

15 01:18:46:590PM Plasma Ok

16 01:40:04:340PM Plasma Ok

17 01:55:52:857PM Plasma Ok

18 02:08:52:997PM Plasma Ok

19 02:22:30:873PM Plasma Ok

20 02:39:11:090PM Plasma Ok

21 02:52:59:733PM Plasma Ok

22 03:05:39:450PM Plasma Ok

23 03:18:20:030PM Plasma Ok

24 03:30:54:280PM Plasma Ok

25 03:46:44:140PM Plasma Ok

26 04:10:54:560PM Plasma Ok

27 04:23:41:937PM Plasma Ok

28 04:36:21:873PM Plasma Ok

29 04:48:49:327PM Plasma Ok

30 05:07:45:747PM Plasma Ok

Session Leader Comments
Mar 17 2006 09:18:08:263AM	1060317001	Steve Wolfe	Shot#1: Bad runaways early disruption at 0.7sec TCI looks noisy.
Mar 17 2006 09:48:47:030AM	1060317002	Steve Wolfe	Shot#1 looked like there was no nl04 signal, but it's there. Jim seems to have zeroed the nl04 predictor. Re-do the load from scratch for shot#2: Load from 1060317018 Import seg2 from 1050415025 Recalculate ONLY THE MAGNETICS PREDICTORS: Wires 1-8, and 16.
Mar 17 2006 09:59:28:013AM	1060317003	Steve Wolfe	Shot#3: plasma to 1.7sec. ECE gate valve was closed, but I'm pretty sure there's no locked mode. Nebar~2.1e20. Next shot: Acoil on full current
Mar 17 2006 10:17:32:483AM	1060317004	Steve Wolfe	Shot#4: Acoil at 3500A, ECE signal not there yet EFIT didn't run. No locked mode, reduce NL04 to 1.0e20 and try again. B21_app=10.4G
Mar 17 2006 10:27:24:827AM	1060317005	Steve Wolfe	Shot#5: NL04 to 1.0e20; Acoil still at 4000 program Still no locked mode. Drop it to 0.8 for next shot. If that doesn't work, move on to "C"
Mar 17 2006 10:41:02:403AM	1060317006	Steve Wolfe	Shot#6: NL04 to 0.8e20; Acoil program still at 4000. Maybe locks in rampdown, around 1.57sec. Move on to Step 2C: Density in free-fall after 0.8sec, Acoil demand at 2000A.
Mar 17 2006 10:53:48:327AM	1060317007	Steve Wolfe	Shot#7: Move on to Step 2C: Density in free-fall after 0.8sec, Acoil demand at 2000A. Fizzle.
Mar 17 2006 11:28:13:640AM	1060317008	Steve Wolfe	Shot#8: Move on to Step 2C: Density in free-fall after 0.8sec, Acoil demand at 2000A. plasma to 1.65sec. Locked mode at 1.37sec, nl04=6.0e19, 4.7G on A-coil (1760A). Nebar=1.07e20, Btot(Model)=4.7G Compare 1050415030: NL04=0.95 at 4.4G (app), phi_a=-104deg. Let's move on 3A: [+Btop -Bbot -Gtop +Gbot]
Mar 17 2006 11:41:38:107AM	1060317009	Steve Wolfe	Shot#9: move on 3A: [+Btop -Bbot -Gtop +Gbot],NL04 back to 1.2e20, Acoil cur program back to 4000A. Dud.
Mar 17 2006 11:53:20:810AM	1060317010	Steve Wolfe	Shot#10: move on 3A: [+Btop -Bbot -Gtop +Gbot],NL04 back to 1.2e20, Acoil cur program back to 4000A. Dud
Mar 17 2006 12:15:59:840PM	1060317011	Steve Wolfe	Shot#10: move on 3A: [+Btop -Bbot -Gtop +Gbot],NL04 back to 1.2e20, Acoil cur program back to 4000A. plasma, some runaways -Locks around 1.4sec, nebar=1.95e20 ? B21_app=10.0G =(7.5,-6.5) Btot(model) = 9.7G Next shot: Drop NL04 to 1.0e20 to try to get it to lock earlier.
Mar 17 2006 12:21:55:403PM	1060317012	Steve Wolfe	Shot#11: Drop NL04 to 1.0e20 to try to get it to lock earlier. fizzle
Mar 17 2006 12:42:04:483PM	1060317013	Steve Wolfe	Shot#12: Drop NL04 to 1.0e20 to try to get it to lock earlier. plasma to 1.6sec, locks at 0.74sec, nebar=1.55e20. Well, that brackets it pretty well. Next: Part "C", density in free-fall after 0.8sec; Acoil prog to 1900A
Mar 17 2006 01:14:12:890PM	1060317014	Steve Wolfe	Shot#13: Part "3C", density in free-fall after 0.8sec; Acoil prog to 1900A plasma to 1.65sec Locks at 1.3sec,nebar=1.35 (nl4=7.5e19) but field is too low; Bapp=3.3G ? Acoil was programmed to 1600 and got 1280. We want 1700, so program 2000, I think.
Mar 17 2006 01:29:00:763PM	1060317015	Steve Wolfe	Shot#15: Part "3C", density in free-fall after 0.8sec; Acoil prog to 2000A plasma to 1.6 Locks at 1.23sec, nl04=8e19, nebar=1.44e20, B21_app=4.5G. Move to Case 4: Reverse leads to give [-Btop +Bbot +Gtop -Gbot] We'll leave the current and density program as is, so next shot will be case 4C; then go back up in density and current to get parts A and B
Mar 17 2006 01:46:18:373PM	1060317016	Steve Wolfe	Shot#16: Reverse leads to give [-Btop +Bbot +Gtop -Gbot] Part "4C", density in free-fall after 0.8sec; Acoil prog to 2000A plasma. Locks at 1.19sec, nl04=7.7e19, nebar=1.44e20, B21app=4.6G Btot (Model)=8.5G
Mar 17 2006 01:57:28:983PM	1060317017	Steve Wolfe	Shot#17: 4A - NL04=1.2e20, Acoil Current to 4000 (prog) fizzle.
Mar 17 2006 02:17:42:043PM	1060317018	Steve Wolfe	Shot#18: 4A - NL04=1.2e20, Acoil Current to 4000 (prog) plasma to 1.5sec locks at 1.45 I think - lose sawteeth, jump on magnetics, but no density fall? Density at nl04=1.46e20.Nebar=2.6e20 B21_app=(-6.5,7.5) = 10G, btot(mod)=13.9G Next shot: drop nl04 to 1.1e20
Mar 17 2006 02:24:02:140PM	1060317019	Steve Wolfe	Shot#19:drop nl04 to 1.1e20 (ran high on 18) fizzle
Mar 17 2006 02:45:22:043PM	1060317020	Steve Wolfe	Shot#20:drop nl04 to 1.1e20 (ran high on 18) plasma, locked mode at .97sec, nl04=1.1, nebar=2.0e20 Next: Drop Acoil current from 4000 to 3300A (program)
Mar 17 2006 02:54:58:780PM	1060317021	Steve Wolfe	Shot#21: Drop Acoil current from 4000 to 3300A (program) fizzle.
Mar 17 2006 03:13:15:340PM	1060317022	Steve Wolfe	Shot#22: Drop Acoil current from 4000 to 3300A (program) plasma, locks at 1.23sec, b21_app=8.4G,nebar=2.05e20 B21_app=(-5.5,6.4) Next: drop acoil current from 3300A to 2800A (program)
Mar 17 2006 03:26:46:607PM	1060317023	Steve Wolfe	Shot#23: Drop Acoil current from 3300A to 2800A(program) plasma to 1.5sec lock at 1.27sec, nebar=2.06e20, B21=6.9G=(-4.7,5.3) Next: Acoil to 1800A, need to get a non-lock case
Mar 17 2006 03:43:18:687PM	1060317024	Steve Wolfe	Shot#24: Acoil to 1800A, need to get a non-lock case plasma to 1.66. No locked mode. B21_app=(-2.65,3.1)=3.9G {Is it consistent with 4.5G result?) Anyhow, that brackets it. Next go to 2300A (program) This one has a possible lock in rampdown, at 1.55sec.
Mar 17 2006 03:53:36:340PM	1060317025	Steve Wolfe	Shot#25: Acoil to 2300A plasma to 1.62sec Lock at 1.46sec, nebar=2.1e20, b21_app=(-3.7,4.25) Next: On to step 5A [+Btop +Bbot -Gtop -Gbot]
Mar 17 2006 04:17:31:920PM	1060317026	Steve Wolfe	Shot#26: Step 5A [+Btop +Bbot -Gtop -Gbot] Acoil=4000A program. NL04=1.1e20 program plasma. No locked mode. B21_app=4.5G = (3.6,2.8) Next: Do the density drop; I don't know if we can even get it low enough to lock in this direction with this spectrum.
Mar 17 2006 04:26:38:967PM	1060317027	Steve Wolfe	Shot#27: Do the density drop; Start from 8e19, free-fall after .8sec Acoil still at 4000 (program) to get \|B21\|=4.4G I don't know if we can even get nebar low enough to lock in this direction with this spectrum. Probably should have started with the negative sense of this case, but that will need to wait till next time. fizzle.
Mar 17 2006 04:38:51:793PM	1060317028	Steve Wolfe	Shot#28: Do the density drop; Start from 8e19, free-fall after .8sec Acoil still at 4000 (program) to get \|B21\|=4.5G dud
Mar 17 2006 04:50:55:217PM	1060317029	Steve Wolfe	Shot#29: Do the density drop; Start from 8e19, free-fall after .8sec Acoil still at 4000 (program) to get \|B21\|=4.5G No TF
Mar 17 2006 05:20:31:700PM	1060317030	Steve Wolfe	Shot#30: Last Try- Start from 8e19, free-fall after .8sec Acoil still at 4000 (program) to get \|B21\|=4.5G plasma to 0.6sec, disrupted before the density drop just after the start of the acoil pulse. Possible early locked mode??? There were some runaways and looks like an injection at.56sec, then it locks around .575 and there's a major injection at .599

Physics Operator Comments
Mar 17 2006 09:30:13:717AM		Jim Irby	loaded shot 1050415025 --- verfied only seg 1 and seg 2 were being used loaded shot 1060316018 into seg 1 did recalc on all seg 2 lines did a load/clean Ip request is 1 MA Bt 5.4 T nl04 request is 1.2e20 /m^2 TF delay and fizzle back to normal --- no need for backporch No A-Coil current for this shot --- see if we can get locked modes plasma for 0.7 s --- lots of runaways
Mar 17 2006 12:16:57:700PM	1060317011	Jim Irby	Just noticed my earlier entries were under TCI no PO EF4 from -1325 to -1335 A prefill to 30 ms from 28 ms plasma into rampdown --- not a great startup but...
Mar 17 2006 12:31:41:077PM	1060317012	Jim Irby	nl04 from 1.2 to 1.0e20/m^2 fizzle ---
Mar 17 2006 12:40:52:140PM	1060317013	Jim Irby	prefill back to 28 ms TF vert cooling from -182 to -184 vessel back to 35/35/35 from 20/20/20 folling this shot plasma into rampdown --- startup much better
Mar 17 2006 01:08:45:450PM	1060317014	Jim Irby	vessel at 35/35/35 nl04 ramped negative at 0.8 s from 1e20/m^2 A-Coils to 1600 A --- but Steve wanted 1900 A plasma into rampdown
Mar 17 2006 01:27:00:530PM	1060317015	Jim Irby	A-Coils to 2000 A plasma into rampdown
Mar 17 2006 01:46:47:263PM	1060317016	Jim Irby	repeat with new A-Coil configuration plasma
Mar 17 2006 02:03:30:700PM	1060317017	Jim Irby	nl04 request to 1.2e20 until 1.5 s A-Coils to 4000 A fizzle --- killed at 20 ms by ??
Mar 17 2006 02:16:33:763PM	1060317018	Jim Irby	try again with no DPCS changes plasma
Mar 17 2006 02:30:02:857PM	1060317019	Jim Irby	pg1 from 50 to 60 ms starting at 0.3 s nl04 from 1.2 to 1.1e20/m^2 fizzle problems with data system
Mar 17 2006 02:45:33:390PM	1060317020	Jim Irby	prefill from 28 to 26 ms lost some data from last shot plasma --- startup good
Mar 17 2006 03:00:43:937PM	1060317021	Jim Irby	A-Coil current from 4000 to 3300 A fizzle ---
Mar 17 2006 03:11:18:733PM	1060317022	Jim Irby	prefill from 26 to 24 ms plasma --- startup very good
Mar 17 2006 03:20:48:763PM	1060317023	Jim Irby	A-Coil current to 2800 A plasma
Mar 17 2006 03:33:34:077PM	1060317024	Jim Irby	A-Coil current to 1800 A from 2800 A prefill from 24 to 22 ms --- almost lost startup on shot 23 plasma --- startup better
Mar 17 2006 03:52:40:560PM	1060317025	Jim Irby	A-Coil current to 2300 A reduced prefill another ms to 21 ms plasma --- breakdown a little later
Mar 17 2006 04:15:38:247PM	1060317026	Jim Irby	Cell entry to change A-Coil configuration A-Coil current to 4000 A plasma ---
Mar 17 2006 04:29:35:420PM	1060317027	Jim Irby	Drive density negative at 0.8 s starting from 8e19/m^2 fizzle --- spikes in CIII at .02 and .028 ms does in startup
Mar 17 2006 04:40:46:903PM	1060317028	Jim Irby	no DPCS changes dud --- Bz0?
Mar 17 2006 05:02:18:373PM	1060317029	Jim Irby	EF4 from -1335 to -1345 A no TF??
Mar 17 2006 05:20:50:840PM	1060317030	Jim Irby	Try again with TF disruption at 0.6 s a few injections starting at .1 s could be boron big injection at just before 0.6 s

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:13:52:780AM	Plasma	Ok
2	09:40:47:090AM	Test	Ok
3	09:52:52:700AM	Plasma	Ok
4	10:05:45:653AM	Plasma	Ok
5	10:20:31:687AM	Plasma	Ok
6	10:33:23:373AM	Plasma	Ok
7	10:52:03:530AM	Plasma	Ok
8	11:06:34:873AM	Plasma	Ok
9	11:39:02:513AM	Plasma	Ok
10	11:51:42:357AM	Plasma	Ok
11	12:06:35:043PM	Plasma	Ok
12	12:20:15:827PM	Plasma	Ok
13	12:37:23:030PM	Plasma	Ok
14	12:59:54:793PM	Plasma	Ok
15	01:18:46:590PM	Plasma	Ok
16	01:40:04:340PM	Plasma	Ok
17	01:55:52:857PM	Plasma	Ok
18	02:08:52:997PM	Plasma	Ok
19	02:22:30:873PM	Plasma	Ok
20	02:39:11:090PM	Plasma	Ok
21	02:52:59:733PM	Plasma	Ok
22	03:05:39:450PM	Plasma	Ok
23	03:18:20:030PM	Plasma	Ok
24	03:30:54:280PM	Plasma	Ok
25	03:46:44:140PM	Plasma	Ok
26	04:10:54:560PM	Plasma	Ok
27	04:23:41:937PM	Plasma	Ok
28	04:36:21:873PM	Plasma	Ok
29	04:48:49:327PM	Plasma	Ok
30	05:07:45:747PM	Plasma	Ok