| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Ian Hutchinson |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| Purpose: MP339, Mode locking Studies at Lower Current/Hutchinson/Parker |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:33:320PM |
| Author: Ian Hutchinson |
| Session Leader 1020618. Mode Locking at Lower Current MP 339. _____________________________________________________________ SL Hutch. PO Parker. This was a very successful run. About 80% of the miniproposal was completed. We demonstrated locked mode suppression and causation using several new coil configurations corresponding to a good range of phases. Locked modes were easily obtained at 0.6MA current for NL04 ~0.25e20, but somewhat harder to diagnose than at higher current. In general we confirm that configuration A is close to being aligned with the intrinsic error, but there are others near it that are also effective. We were able to push the current in the D and A configurations sufficiently past its optimum stabilizing value to cause a locked mode on the other side (shots 10, 34). These and other observations should enable us to place much better quantitative limits on the intrinsic and locking field levels. But more careful analysis is needed than this brief summary. The following table summarizes the immediate observations of this day's run. The configurations are specified in the logbook and in the miniproposal. (These coil currents are cited using -160A as offset. Too small. Add 100A.) shot config I_acoil set nl04 locked phase Iacmax at lock (A) (s) (deg) (A) 1 A 0 0 .16 1.205 23 0 2 A 2300 4000 .36 0 23 2300 3 A 1160 2000 .4 0 23 1160 4 A 0 0 .4 0 23 0 5 A 0 0 .21 1.38 23 0 6 A 0 2000 .24 -2 23 1160 7 A 360 1000 .24 0 23 360 8 -D 2160 4000 .2 .66 -110 2660 9 -D 1650 3000 .23 .95 -110 1880 10 D 2770 5000 .28 1.32 70 2770 11 D 1920 3000 .22 0 70 1920 12 -E 1670 5000 .22 .79 -146 2770 13 -E 1150 2000 .22 .95 -146 1200 15 E 0 5000 .21 -2 34 2830 16 E 0 0 .21 1.30 34 0 17 -F 1700 5000 .21 .79 -129 2300 18 -F 900 2000 .19 .94 -129 1150 20 F 0 5000 .25 -2 51 2300 21 G 2340 5000 .21 .89 8 2730 22 G 0 2000 .23 0 8 1150 23 -G 0 5000 .21 -1 -172 2770 24 -G 0 2000 .20 -1 -172 1200 25 -G 0 2000 .27 -1 -172 1200 26 -H 2280 5000 .31 .88 -75 2740 27 -H 0 2000 .22 -1 -75 1220 28 H 2820 5000 .32 1.2 105 2820 29 H 1620 2500 .31 1.41 105 1620 30 H 0 1500 .27 -1 105 820 33 E 0 5000 .30 0 34 2930 34 A 2300 5000 .32 1.05 23 2300 35 -G 1200? 5000 .27 0.73? -172 2780 -1 locked time implies possible permanent lock. -2 implies initially possibly locked, then possibly unlocking. 6 20 start locked and unlock later. 15 is disputed whether it unlocks. 23-25 27 30 permanently locked. 35 may be permanently locked. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:18:397PM |
| Author: Ron Parker |
| Engineering Setup & Run Plan for Wednesday, June 18, 2003 PURPOSE: MP339, Mode Locking Studies at Lower Current Session Leader: Hutchinson Physop: Parker ENGINEERING SETUP NO ECDC. 60 C Bake Overnight Run Starts at 9:00 AM and Ends at 5:00 PM Power Systems as for 1030612004 Gas setup: Fill B-Top with 6 psi of D2 hybrid enabled (PG4) Fill B-side lower with 1 psi Ar Hybrid enabled (PG1) Fill B-side upper with 10 psi D2 Hybrid Disabled (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) ICRF:No ICRF required for this run. Enable the ECE and DNB gate-valves, assuming no vacuum problems RUN PLAN We will begin with a low density, 600 kA shot similar to shot 1030612004. However, pulsed gas operation during the shot will be disabled and we will only inject the prepulse gas in order to keep the density low.The plan is to establish locked modes and use the locked-mode coils to determine their hopefully beneficial effect. Run Summary The machine ran exceptionally well for this run, although the conditions were not very demanding: I ~ 600 kA, B ~ 4 T, n ~ 2-3e19 m-3.Locked modes were produced with these plasma parameters and the effect of various configurations of the locked mode coils were investigated at different current levels.See session leader's summary. Scorecard: 35 shots, 1 disruption due to interferometer problem and 3 duds: 1 due to pulsed gas failing to fire, 1 due to EF3 not turning on and 1 due to EF3 breaker pulling. ---------------------------------------------------------------------------- 1030618001 PARKER PHYSICS_OPERATOR Jun 18 2003 9:39:37:153AM . . . . . . . . . . . . . . . . . . . . Shot 1 was a low density shot with flat top at 4 T, 600 kA. Hard x-rays were strong. A coil was not energized. ---------------------------------------------------------------------------- 1030618002 PARKER PHYSICS_OPERATOR Jun 18 2003 9:39:08:403AM . . . . . . . . . . . . . . . . . . . . Shot 2 was similar, except A coil was on with setting 4000 on PCS. Density was higher at 3.5e13. Same current and field as in shot 1. ---------------------------------------------------------------------------- 1030618003 PARKER PHYSICS_OPERATOR Jun 18 2003 9:47:56:526AM . . . . . . . . . . . . . . . . . . . . Shot 3 was similar to shot 2 except A coil PCS setting was 2000. Density was 4e13, somewhat less overshoot on Ip as it approached 600 kA. Hard X-rays were much reduced relative to first two shots. Next shot: A coil current set to 0, triangularity reduced. ---------------------------------------------------------------------------- 1030618004 PARKER PHYSICS_OPERATOR Jun 18 2003 10:01:25:060AM . . . . . . . . . . . . . . . . . . . . Shot 4 ran as programmed. Next shot: Density will be programmed for 2.5e13, RCLEAR reduced by 6mm, RCUR by 3mm, so outer gap should not change. Trying to improve stability. ---------------------------------------------------------------------------- 1030618005 PARKER PHYSICS_OPERATOR Jun 18 2003 10:12:36:066AM . . . . . . . . . . . . . . . . . . . . Shot 5 ran as programmed with density ~ 2e19. Lock mode appeared at t=1.38 s Next shot: A coil on and set to 2000 on PCS. ---------------------------------------------------------------------------- 1030618006 PARKER PHYSICS_OPERATOR Jun 18 2003 10:22:41:333AM . . . . . . . . . . . . . . . . . . . . Shot 6 ran as programmed, density ~ 2.3-2.4e19. No locked mode. Next shot: A coil at 1000 (PCS), 5 ms more Argon. ---------------------------------------------------------------------------- 1030618007 PARKER PHYSICS_OPERATOR Jun 18 2003 10:46:20:853AM . . . . . . . . . . . . . . . . . . . . Shot 7 ran as programmed. Very similar to shot 6. Next shot: Locked mode coil configuration changed. A coil current set at 4000. Argon pulse increased by 5 msec to 30 msec. ---------------------------------------------------------------------------- 1030618008 PARKER PHYSICS_OPERATOR Jun 18 2003 10:59:42:806AM . . . . . . . . . . . . . . . . . . . . Shot 8 ran well. Locked mode appeared during ramp up of "correction coil" current. This was expected. Next shot: A coil current will be ramped, starting at 0.5 s, ramping to 3000 at 1.0 s and held there until 1.5 s. ---------------------------------------------------------------------------- 1030618009 PARKER PHYSICS_OPERATOR Jun 18 2003 11:19:41:266AM . . . . . . . . . . . . . . . . . . . . Shot 9 ran well. Locked mode appeared at 0.9 s. Next shot: A-coil current will be reversed and the height of the ramp will be 5000 on PCS. There was a slight delay to check an indicated fuse outage. No fuses were blown. ---------------------------------------------------------------------------- 1030618010 PARKER PHYSICS_OPERATOR Jun 18 2003 11:32:31:326AM . . . . . . . . . . . . . . . . . . . . The shots continue to run well. Locked mode occured at ~ 1.35 sec. Next shot: Max A Coil current reduced to 3000. ---------------------------------------------------------------------------- 1030618011 PARKER PHYSICS_OPERATOR Jun 18 2003 11:48:15:740AM . . . . . . . . . . . . . . . . . . . . Shot 11 ran as programmed. New A Coil configuration for next shot. A coil setting = 5000. ---------------------------------------------------------------------------- 1030618012 PARKER PHYSICS_OPERATOR Jun 18 2003 11:59:43:310AM . . . . . . . . . . . . . . . . . . . . Shot 12 ran well with a locked mode occuring at ~ 0.8 sec. Next shot: A coil current = 2000, same configuration as in shot 12. ---------------------------------------------------------------------------- 1030618013 PARKER PHYSICS_OPERATOR Jun 18 2003 12:08:18:653PM . . . . . . . . . . . . . . . . . . . . Shot 13 ran without locked mode. Nextshot: A coil current will be reversed from shot 13, amplitude = 5000. ---------------------------------------------------------------------------- 1030618014 PARKER PHYSICS_OPERATOR Jun 18 2003 12:22:47:796PM . . . . . . . . . . . . . . . . . . . . We lost density control on that shot due to laser failure before shot. Shot disrupted at 0.95 msec. We'll repeat shot on shot 15. ---------------------------------------------------------------------------- 1030618015 PARKER PHYSICS_OPERATOR Jun 18 2003 12:38:54:760PM . . . . . . . . . . . . . . . . . . . . Shot 15 recovered and was a normal shot. Next shot: A-coil current = 0. ---------------------------------------------------------------------------- 1030618016 PARKER PHYSICS_OPERATOR Jun 18 2003 12:58:43:890PM . . . . . . . . . . . . . . . . . . . . Shot 16 ran well. Mysterious density bump occurs from .18 - .35 sec, as in a few previous shots. This is not due to any gas valve programming. Instead it is due to problems with interferometer feedback signal. ---------------------------------------------------------------------------- 1030618017 PARKER PHYSICS_OPERATOR Jun 18 2003 1:06:29:650PM . . . . . . . . . . . . . . . . . . . . Shot 17 ran well, with small plasma-wall interaction during rampdown. Next shot, A coil current = 2000. ---------------------------------------------------------------------------- 1030618018 PARKER PHYSICS_OPERATOR Jun 18 2003 1:15:47:446PM . . . . . . . . . . . . . . . . . . . . Shot 18 ran well. Next shot: reverse current direction in A coil, I = 5000. ---------------------------------------------------------------------------- 1030618019 PARKER PHYSICS_OPERATOR Jun 18 2003 1:28:43:366PM . . . . . . . . . . . . . . . . . . . . Ooops - no EF 3, no plasma. Repeat on next shot. ---------------------------------------------------------------------------- 1030618020 PARKER PHYSICS_OPERATOR Jun 18 2003 1:46:09:366PM . . . . . . . . . . . . . . . . . . . . Shot 20 ran again, similar to preceeding shots. No locked mode. Next shot: New configuration of locked mode coils. ---------------------------------------------------------------------------- 1030618021 PARKER PHYSICS_OPERATOR Jun 18 2003 2:01:38:153PM . . . . . . . . . . . . . . . . . . . . Shot 21 ran well with good locked mode supression. Next shot: A coil current = 2000. ---------------------------------------------------------------------------- 1030618022 PARKER PHYSICS_OPERATOR Jun 18 2003 2:19:01:746PM . . . . . . . . . . . . . . . . . . . . Shot 22 ran well, no locked mode apparent. Next shot: same as 22 but with reversed polarity and current = 5000. ---------------------------------------------------------------------------- 1030618023 PARKER PHYSICS_OPERATOR Jun 18 2003 2:28:47:136PM . . . . . . . . . . . . . . . . . . . . Shot 23 ran uneventfully. Next shot: 2000 on A coil supply. ---------------------------------------------------------------------------- 1030618024 PARKER PHYSICS_OPERATOR Jun 18 2003 3:37:15:306PM . . . . . . . . . . . . . . . . . . . . Shot 24 ran as programmed. Small sawteeth -- maybe locked for the whole shot? Next shot: nl04 = 3.2e19. ---------------------------------------------------------------------------- 1030618025 PARKER PHYSICS_OPERATOR Jun 18 2003 3:37:31:400PM . . . . . . . . . . . . . . . . . . . . Shot 25 ran well with slightly higher density. Still no or very small sawteeth. Next shot: new configuration of A coils. ---------------------------------------------------------------------------- 1030618026 PARKER PHYSICS_OPERATOR Jun 18 2003 3:20:06:166PM . . . . . . . . . . . . . . . . . . . . Shot 26 ran, but interferometer did not track density. Next shot: lower nl04 program to 2.5e19 and reduce current in A Coil to 2000. ---------------------------------------------------------------------------- 1030618027 PARKER PHYSICS_OPERATOR Jun 18 2003 3:36:07:760PM . . . . . . . . . . . . . . . . . . . . Shot 27 ran well, with density =2.0e19. Next shot: new A-coil configuration, setting = 5000. Density will be programmed for 3.0e19. ---------------------------------------------------------------------------- 1030618028 PARKER PHYSICS_OPERATOR Jun 18 2003 3:45:03:576PM . . . . . . . . . . . . . . . . . . . . Shot 28 ran with nel4 = 3e19. Nice example of locking at ~1.2 sec. Next shot: Same A - coil configuration reduce current to 2500. ---------------------------------------------------------------------------- 1030618029 PARKER PHYSICS_OPERATOR Jun 18 2003 4:12:23:473PM . . . . . . . . . . . . . . . . . . . . Shot 29 ran well, with loced mode occurring toward end of flat top. Next shot: reduced A-Coil current - 1500. ---------------------------------------------------------------------------- 1030618030 PARKER PHYSICS_OPERATOR Jun 18 2003 4:13:25:223PM . . . . . . . . . . . . . . . . . . . . Shot 30 ran well, current in a-coil was 1500 on PCS. next shot: new configuration of A-coil, current =5000. ---------------------------------------------------------------------------- 1030618031 PARKER PHYSICS_OPERATOR Jun 18 2003 4:26:22:326PM . . . . . . . . . . . . . . . . . . . . Shot 31 was a dud -- no pulsed gas. It's not clear why. Repeat the settings for next shot. ---------------------------------------------------------------------------- 1030618032 PARKER PHYSICS_OPERATOR Jun 18 2003 4:36:18:646PM . . . . . . . . . . . . . . . . . . . . Again, no plasma. This time EF3 breaker pulled before shot. But pulsed gas fired normally. We'll keep trying. ---------------------------------------------------------------------------- 1030618033 PARKER PHYSICS_OPERATOR Jun 18 2003 4:54:58:083PM . . . . . . . . . . . . . . . . . . . . Shot 33 ran well, strong sawtooth, no locked mode. Next shot: Configuration A, 5000 setting for current. ---------------------------------------------------------------------------- 1030618034 PARKER PHYSICS_OPERATOR Jun 18 2003 5:10:17:033PM . . . . . . . . . . . . . . . . . . . . Shot ran, there seemed to be a locked mode, but only from about 1.15 - 1.25 sec Next (and last) shot: -G configuration, full current. ---------------------------------------------------------------------------- 1030618035 PARKER PHYSICS_OPERATOR Jun 18 2003 5:24:45:870PM . . . . . . . . . . . . . . . . . . . . The shot ran and for most of the discharge a locked mode seemed to be present. |
| Session Leader Comments | |||
| Jun 18 2003 08:32:55:160AM | Ian Hutchinson | MP 339 Mode Locking Studies at Lower Current. Ohmic run. Trying to demonstrate the induction of a locked mode using different phasing, and to establish the threshold for locking more quantitatively. | |
| Jun 18 2003 12:40:52:267PM | Ian Hutchinson | For logbook reference here are the tables of signals Each coil by itself: Coil (1,1) T/A Phase (2,1) T/A Phase BTOP 1.79e-07 0.151 6.56e-08 -0.496 BBOT 2.47e-07 1.118 8.65e-08 1.772 DTOP 2.38e-07 1.500 8.24e-08 0.933 DBOT 2.47e-07 2.374 8.65e-08 3.028 GTOP 2.38e-07 -2.898 8.24e-08 2.818 GBOT 2.47e-07 -2.024 8.65e-08 -1.370 JTOP 2.38e-07 -1.641 8.24e-08 -2.209 JBOT 2.47e-07 -0.767 8.65e-08 -0.113 The planned configurations: Bt Bb Dt Db Gt Gb Jt Jb (1,1) T/A Phase (2,1) T/A Phase B21 mT A 0 0 1 -1 0 0 -1 1 4.11e-07 0.3255 2.93e-07 0.3957 0.6649 B 0 0 1 1 0 0 -1 -1 8.80e-07 1.9461 1.69e-07 2.0230 0.3839 C -1 0 0 1 1 0 0 -1 8.06e-07 2.8144 3.17e-07 2.8963 0.7209 D 0 0 1 0 0 -1 -1 0 7.12e-07 1.3700 2.32e-07 1.2144 0.6950 E 0 0 1 0 0 0 -1 1 3.70e-07 0.9614 2.21e-07 0.5875 0.6633 F 0 0 1 -1 0 -1 -1 0 6.15e-07 1.0240 2.66e-07 0.8934 0.6047 G 0 0 1 -1 -1 0 0 0 4.43e-07 0.2815 2.15e-07 0.1408 0.6456 H 0 0 1 0 1 -1 0 0 4.16e-07 1.8282 1.83e-07 1.8265 0.5492 I -1 0 0 0 1 -1 0 0 3.30e-07 2.7093 2.09e-07 2.3929 0.6267 J 1 0 1 -1 0 0 0 0 3.83e-07 0.2442 1.94e-07 0.1297 0.5830 K -1 0 1 0 1 0 0 -1 6.55e-07 2.6226 2.18e-07 2.4839 0.4960 L 1 0 0 0 -1 -1 0 0 6.00e-07 0.5361 1.22e-07 0.2265 0.3650 M 0 0 1 -1 0 0 -1 0 3.70e-07 0.9614 2.21e-07 0.5875 0.6633 | |
| Jun 18 2003 09:32:53:287AM | 1030618001 | Ian Hutchinson | Config A, Iac=0. nl04=.16, locked at 1.2s |
| Jun 18 2003 09:33:39:227AM | 1030618002 | Ian Hutchinson | Config A set 4000 got 2300 nl04=.36, no lock. |
| Jun 18 2003 09:47:58:950AM | 1030618003 | Ian Hutchinson | Config A. Iac=1160. nl04=.4, No lock. |
| Jun 18 2003 09:57:08:637AM | 1030618004 | Ian Hutchinson | Config A, nl04=.4, Iac=0 No lock. |
| Jun 18 2003 10:14:30:713AM | 1030618005 | Ian Hutchinson | Config A, Iac=0, nl04=.21, lock at 1.38s. |
| Jun 18 2003 10:20:32:827AM | 1030618006 | Ian Hutchinson | Config A, Iac=1160, nl04=.24, no lock |
| Jun 18 2003 10:47:18:623AM | 1030618007 | Ian Hutchinson | Config A, Iac=360, nl04=.24, no lock. |
| Jun 18 2003 10:59:44:463AM | 1030618008 | Ian Hutchinson | Config -D, Iac=2660, nl04=.2, lock at .66s. |
| Jun 18 2003 11:13:15:557AM | 1030618009 | Ian Hutchinson | Use ramp up on Iac to 1s. Lock at .95s, Iac=1650. nl04=.23 |
| Jun 18 2003 11:34:52:910AM | 1030618010 | Ian Hutchinson | Config +D. Iac to 2770A. nl04 .28, lock at 1.32 |
| Jun 18 2003 11:47:17:597AM | 1030618011 | Ian Hutchinson | Config D, Iac=1920, nl04=.22, no lock. |
| Jun 18 2003 11:58:22:727AM | 1030618012 | Ian Hutchinson | Config -E. Iac=2770. nl04=.22, lock at .79s. |
| Jun 18 2003 12:39:32:743PM | 1030618013 | Ian Hutchinson | Config -E, Iac=1200, nl=.22, locked t .95s |
| Jun 18 2003 12:31:41:217PM | 1030618014 | Ian Hutchinson | Config +E, Iac 2770. But density control lost and nl04 fell drastically leading to nonthermal ECE. It might be that there's a locked mode at .76s but hard to be sure. |
| Jun 18 2003 01:01:56:230PM | 1030618016 | Ian Hutchinson | Config E, Iac=0, nl04=.20, lock at 1.3s |
| Jun 18 2003 01:10:33:447PM | 1030618017 | Ian Hutchinson | Config -F. Iac=2300, nl04=.21, locked at .79s. |
| Jun 18 2003 01:23:43:320PM | 1030618018 | Ian Hutchinson | Config -F, Iac 1150. nl04=.19, lock at .94s |
| Jun 18 2003 02:03:29:830PM | 1030618019 | Ian Hutchinson | Dud no EF3 |
| Jun 18 2003 02:18:45:197PM | 1030618020 | Ian Hutchinson | Config +F. Iac=2300A, nl04=.25, no lock. There are signs that this shot is locked initially and unlocks at crossover (around .8s) |
| Jun 18 2003 02:04:57:307PM | 1030618021 | Ian Hutchinson | Config +G. Iac=2730, nl04=.21, lock at .89s |
| Jun 18 2003 02:26:23:660PM | 1030618022 | Ian Hutchinson | Config +G, Iac=1150. No lock. |
| Jun 18 2003 02:40:08:630PM | 1030618023 | Ian Hutchinson | Config -G. Iac=2770, nl04=.21, no lock transition. But might be locked throughout. |
| Jun 18 2003 02:49:15:757PM | 1030618024 | Ian Hutchinson | Config -G. Iac=1200, nl04=.2, no lock. Again similar to previous shot. Small sawteeth from the start. Locked throughout? |
| Jun 18 2003 03:04:04:733PM | 1030618025 | Ian Hutchinson | Config -G. Raised the density to try to unlock the mode if it is locked early. No locking transition. |
| Jun 18 2003 03:26:38:140PM | 1030618026 | Ian Hutchinson | Config -H. nl04=.31, Iac=2740. Lock at .88s |
| Jun 18 2003 03:39:37:307PM | 1030618027 | Ian Hutchinson | Config -H. nl04=.22, Iac=1220, No locked transition. Perhaps locked throughout? |
| Jun 18 2003 04:03:12:293PM | 1030618028 | Ian Hutchinson | Config H, Iac=2820. nl04=.32. Lock at 1.2s |
| Jun 18 2003 04:03:46:420PM | 1030618029 | Ian Hutchinson | Config H, Iac=1620, nl04=.31, lock at 1.41s |
| Jun 18 2003 04:18:30:633PM | 1030618030 | Ian Hutchinson | Config H, nl04=.27, Iac=829. No lock transition. Possible permanent lock. |
| Jun 18 2003 04:27:23:017PM | 1030618031 | Ian Hutchinson | Dud |
| Jun 18 2003 04:46:06:187PM | 1030618032 | Ian Hutchinson | Dud. EF3 breaker pulled before shot. |
| Jun 18 2003 05:18:12:693PM | 1030618033 | Ian Hutchinson | Config +E. Iac=2930. nl04=.30. No lock. |
| Jun 18 2003 05:16:51:633PM | 1030618034 | Ian Hutchinson | Config +A. Iac=2300, nl03=.31, Locked at 1.05s Then unlocked again at about 1.28s. |
| Jun 18 2003 05:27:05:590PM | 1030618035 | Ian Hutchinson | Config -G. Iac=2780. nl04=.27. Possible locking at 0.73 bt might have already been locked. Thereafter surely locked. |
| Physics Operator Comments | |||
| Jun 18 2003 09:39:37:153AM | 1030618001 | Ron Parker | Shot 1 was a low density shot with flat top at 4 T, 600 kA. Hard x-rays were strong. A coil was not energized. |
| Jun 18 2003 09:39:08:403AM | 1030618002 | Ron Parker | Shot 2 was similar, except A coil was on with setting 4000 on PCS. Density was higher at 3.5e13. Same current and field as in shot 1. |
| Jun 18 2003 09:47:56:527AM | 1030618003 | Ron Parker | Shot 3 was similar to shot 2 except A coil PCS setting was 2000. Density was 4e13, somewhat less overshoot on Ip as it approached 600 kA. Hard X-rays were much reduced relative to first two shots. Next shot: A coil current set to 0, triangularity reduced. |
| Jun 18 2003 10:01:25:060AM | 1030618004 | Ron Parker | Shot 4 ran as programmed. Next shot: Density will be programmed for 2.5e13, RCLEAR reduced by 6mm, RCUR by 3mm, so outer gap should not change. Trying to improve stability. |
| Jun 18 2003 10:12:36:067AM | 1030618005 | Ron Parker | Shot 5 ran as programmed with density ~ 2e19. Lock mode appeared at t=1.38 s Next shot: A coil on and set to 2000 on PCS. |
| Jun 18 2003 10:22:41:333AM | 1030618006 | Ron Parker | Shot 6 ran as programmed, density ~ 2.3-2.4e19. No locked mode. Next shot: A coil at 1000 (PCS), 5 ms more Argon. |
| Jun 18 2003 10:46:20:853AM | 1030618007 | Ron Parker | Shot 7 ran as programmed. Very similar to shot 6. Next shot: Locked mode coil configuration changed. A coil current set at 4000. Argon pulse increased by 5 msec to 30 msec. |
| Jun 18 2003 10:59:42:807AM | 1030618008 | Ron Parker | Shot 8 ran well. Locked mode appeared during ramp up of "correction coil" current. This was expected. Next shot: A coil current will be ramped, starting at 0.5 s, ramping to 3000 at 1.0 s and held there until 1.5 s. |
| Jun 18 2003 11:19:41:267AM | 1030618009 | Ron Parker | Shot 9 ran well. Locked mode appeared at 0.9 s. Next shot: A-coil current will be reversed and the height of the ramp will be 5000 on PCS. There was a slight delay to check an indicated fuse outage. No fuses were blown. |
| Jun 18 2003 11:32:31:327AM | 1030618010 | Ron Parker | The shots continue to run well. Locked mode occured at ~ 1.35 sec. Next shot: Max A Coil current reduced to 3000. |
| Jun 18 2003 11:48:15:740AM | 1030618011 | Ron Parker | Shot 11 ran as programmed. New A Coil configuration for next shot. A coil setting = 5000. |
| Jun 18 2003 11:59:43:310AM | 1030618012 | Ron Parker | Shot 12 ran well with a locked mode occuring at ~ 0.8 sec. Next shot: A coil current = 2000, same configuration as in shot 12. |
| Jun 18 2003 12:08:18:653PM | 1030618013 | Ron Parker | Shot 13 ran without locked mode. Nextshot: A coil current will be reversed from shot 13, amplitude = 5000. |
| Jun 18 2003 12:22:47:797PM | 1030618014 | Ron Parker | We lost density control on that shot due to laser failure before shot. Shot disrupted at 0.95 msec. We'll repeat shot on shot 15. |
| Jun 18 2003 12:38:54:760PM | 1030618015 | Ron Parker | Shot 15 recovered and was a normal shot. Next shot: A-coil current = 0. |
| Jun 18 2003 12:58:43:890PM | 1030618016 | Ron Parker | Shot 16 ran well. Mysterious density bump occurs from .18 - .35 sec, as in a few previous shots. This is not due to any gas valve programming. Instead it is due to problems with interferometer feedback signal. |
| Jun 18 2003 01:06:29:650PM | 1030618017 | Ron Parker | Shot 17 ran well, with small plasma-wall interaction during rampdown. Next shot, A coil current = 2000. |
| Jun 18 2003 01:15:47:447PM | 1030618018 | Ron Parker | Shot 18 ran well. Next shot: reverse current direction in A coil, I = 5000. |
| Jun 18 2003 01:28:43:367PM | 1030618019 | Ron Parker | Ooops - no EF 3, no plasma. Repeat on next shot. |
| Jun 18 2003 01:46:09:367PM | 1030618020 | Ron Parker | Shot 20 ran again, similar to preceeding shots. No locked mode. Next shot: New configuration of locked mode coils. |
| Jun 18 2003 02:01:38:153PM | 1030618021 | Ron Parker | Shot 21 ran well with good locked mode supression. Next shot: A coil current = 2000. |
| Jun 18 2003 02:19:01:747PM | 1030618022 | Ron Parker | Shot 22 ran well, no locked mode apparent. Next shot: same as 22 but with reversed polarity and current = 5000. |
| Jun 18 2003 02:28:47:137PM | 1030618023 | Ron Parker | Shot 23 ran uneventfully. Next shot: 2000 on A coil supply. |
| Jun 18 2003 03:37:15:307PM | 1030618024 | Ron Parker | Shot 24 ran as programmed. Small sawteeth -- maybe locked for the whole shot? Next shot: nl04 = 3.2e19. |
| Jun 18 2003 03:37:31:400PM | 1030618025 | Ron Parker | Shot 25 ran well with slightly higher density. Still no or very small sawteeth. Next shot: new configuration of A coils. |
| Jun 18 2003 03:20:06:167PM | 1030618026 | Ron Parker | Shot 26 ran, but interferometer did not track density. Next shot: lower nl04 program to 2.5e19 and reduce current in A Coil to 2000. |
| Jun 18 2003 03:36:07:760PM | 1030618027 | Ron Parker | Shot 27 ran well, with density =2.0e19. Next shot: new A-coil configuration, setting = 5000. Density will be programmed for 3.0e19. |
| Jun 18 2003 03:45:03:577PM | 1030618028 | Ron Parker | Shot 28 ran with nel4 = 3e19. Nice example of locking at ~1.2 sec. Next shot: Same A - coil configuration reduce current to 2500. |
| Jun 18 2003 04:12:23:473PM | 1030618029 | Ron Parker | Shot 29 ran well, with loced mode occurring toward end of flat top. Next shot: reduced A-Coil current - 1500. |
| Jun 18 2003 04:13:25:223PM | 1030618030 | Ron Parker | Shot 30 ran well, current in a-coil was 1500 on PCS. next shot: new configuration of A-coil, current =5000. |
| Jun 18 2003 04:26:22:327PM | 1030618031 | Ron Parker | Shot 31 was a dud -- no pulsed gas. It's not clear why. Repeat the settings for next shot. |
| Jun 18 2003 04:36:18:647PM | 1030618032 | Ron Parker | Again, no plasma. This time EF3 breaker pulled before shot. But pulsed gas fired normally. We'll keep trying. |
| Jun 18 2003 04:54:58:083PM | 1030618033 | Ron Parker | Shot 33 ran well, strong sawtooth, no locked mode. Next shot: Configuration A, 5000 setting for current. |
| Jun 18 2003 05:10:17:033PM | 1030618034 | Ron Parker | Shot ran, there seemed to be a locked mode, but only from about 1.15 - 1.25 sec Next (and last) shot: -G configuration, full current. |
| Jun 18 2003 05:24:45:870PM | 1030618035 | Ron Parker | The shot ran and for most of the discharge a locked mode seemed to be present. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:04:30:860AM | Plasma | Ok | |
| 2 | 09:21:40:390AM | Plasma | Ok | |
| 3 | 09:35:34:437AM | Plasma | Ok | |
| 4 | 09:48:40:437AM | Plasma | Ok | |
| 5 | 10:01:32:027AM | Plasma | Ok | |
| 6 | 10:14:30:587AM | Plasma | Ok | |
| 7 | 10:27:16:913AM | Plasma | Ok | |
| 8 | 10:47:31:153AM | Plasma | Ok | |
| 9 | 11:01:23:453AM | Plasma | Ok | |
| 10 | 11:19:36:047AM | Plasma | Ok | |
| 11 | 11:32:46:437AM | Plasma | Ok | |
| 12 | 11:48:40:913AM | Plasma | Ok | |
| 13 | 12:01:43:630PM | Plasma | Ok | |
| 14 | 12:15:06:160PM | Plasma | Ok | |
| 15 | 12:28:18:520PM | Plasma | Ok | |
| 16 | 12:41:12:843PM | Plasma | Ok | |
| 17 | 12:59:47:860PM | Plasma | Ok | |
| 18 | 01:12:59:673PM | Plasma | Ok | |
| 19 | 01:25:50:810PM | Plasma | Bad | EF3 breaker opened just before the shot |
| 20 | 01:38:23:120PM | Plasma | Ok | |
| 21 | 01:55:23:570PM | Plasma | Ok | |
| 22 | 02:09:02:710PM | Plasma | Ok | |
| 23 | 02:22:11:897PM | Plasma | Ok | |
| 24 | 02:34:59:207PM | Plasma | Ok | |
| 25 | 02:47:54:347PM | Plasma | Ok | |
| 26 | 03:07:22:703PM | Plasma | Ok | |
| 27 | 03:24:56:140PM | Plasma | Ok | |
| 28 | 03:37:23:697PM | Plasma | Ok | |
| 29 | 03:50:00:690PM | Plasma | Ok | |
| 30 | 04:02:36:733PM | Plasma | Ok | |
| 31 | 04:16:50:383PM | Plasma | Ok | |
| 32 | 04:31:52:287PM | Plasma | Bad | EF3 opened juprior to shot |
| 33 | 04:47:52:830PM | Plasma | Ok | |
| 34 | 05:02:51:137PM | Plasma | Ok | |
| 35 | 05:15:39:867PM | Plasma | Ok | |