| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Martin Greenwald |
| Physics operator(s): | Unknown |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| Today will be a plasma run. |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:06:867PM |
| Author: To Be Determined |
| Run Summary 12 May 93 23 Shots, 17 with plasma flash. Considerable fiddling around arose from getting the power supplies fully under hybrid control and away from their internal current limits. Now they are in this configuration. Difficulties with OH2 and EF1 which gave unpredictable perturbations to the horizontal field were tracked down to time delays in coming out of internal saturation. When the external demand has exceeded the available voltage it causes the internal gate control loop, which is under integral control, to integrate well above the rail on the gate control circuit. Delays of order 40 ms can occur. TF worked very reliably at 5T. Shot 22 was the highest plasma current, about 22 kA. Hexapole adjustments were made by altering the OH2 demand voltage during the ramp-down after commutation. Comparisons between 18, 21, and 22 show use of 0, -100, +100V demand respectively. These shots had fill pressure of 6E-5 on the gauge. This seems to be near the lower limits at the moment. Going to 4E-5 loses breakdown. Plan is to ECDC overnight in the hopes of getting rid of some of the carbon. The RGA show large amount of Methane being generated after the shots. |
| Physics Operator Summaries |
| Session Leader Comments | |||
| May 12 1993 08:23:39:110AM | Martin Greenwald | Start where we ended yesterday - then to horizontal field feedback using
OH2U-OH2L. | |
| May 12 1993 09:40:32:970AM | 930512001 | Martin Greenwald | Intention: Start where we ended yesterday - reestablish breakdown. As shot 930512027
Except swing EF4 voltage negative after +30 msec, current program drops to 0 after commutation. Result: Alternator test instead |
| May 12 1993 09:56:26:880AM | 930512002 | Martin Greenwald | Intention: Start where we ended yesterday - reestablish breakdown. As shot 930512027
Except swing EF4 voltage negative after +30 msec, current program drops to 0 after commutation. Result: OH1 bank didn't charge? Alternator problem - shot aborted |
| May 12 1993 10:22:38:140AM | 930512002 | Martin Greenwald | Intention: Start where we ended yesterday - reestablish breakdown. As shot 930512027
Except swing EF4 voltage negative after +30 msec, current program drops to 0 after commutation. Result: Third try on shot 2. Unknown triggering problem on power supplies. |
| May 12 1993 10:27:37:710AM | 930512003 | Martin Greenwald | Intention: Same as above
Result: Unfortunately same as above |
| May 12 1993 10:50:29:250AM | 930512004 | Martin Greenwald | Intention: Same as above
Result: Breakdown seen at 14 msec, 10 kA of plasma current Field at 5 T |
| May 12 1993 11:01:16:330AM | 930512005 | Martin Greenwald | Intention: Turned of OH2 feed back to null horizontal field
EF4 pushed into inversion after t = 0 EF1 current limit raised from 9 - 11 kA Result: Breakdown at 5 msec, 7 kA Horizontal field is much improved |
| May 12 1993 11:16:07:520AM | 930512006 | Martin Greenwald | Intention: Move EF1_U inversion 30 msec earlier to try to
improve balance. Result: Breakdown at 6 ms, Ip = 10 kA |
| May 12 1993 12:04:27:040PM | 930512007 | Martin Greenwald | Intention: EF3 on 1 msec earlier and try to program post breakdown Bz
EF1_U inverts at -30 msec Result: Breakdown at 13 msec, Ip = 7 kA |
| May 12 1993 12:17:26:020PM | 930512008 | Martin Greenwald | - Intention: EF3 demand voltage raised 30% between 30 and 40 msec
Result: Breakdown at 8 msec |
| May 12 1993 12:31:51:840PM | 930512009 | Martin Greenwald | - Intention: EF3 demand voltage raised again, flat from 0 - 30 msec
Result: Breakdown at 12 msec, Ip = 15kA, EF3 overdone |
| May 12 1993 12:50:57:200PM | 930512010 | Martin Greenwald | - Intention: EF3 demand voltage dropped by about 500 V after 12 msec
Fill pressure dropped to 6 x 10^-5 Result: Breakdown at 8 msec, Ip = 16 kA |
| May 12 1993 01:02:51:740PM | 930512011 | Martin Greenwald | - Intention: EF3 demand voltage dropped another 500 V after 12 msec
Fill pressure dropped to 4 x 10^-5 Result: No Breakdown |
| May 12 1993 01:36:59:930PM | 930512012 | Martin Greenwald | - Intention: Raise pressure to 6 x 10-5
Result: Breakdown back, 13 kA |
| May 12 1993 01:26:03:650PM | 930512013 | Martin Greenwald | - Intention: Raise OH1 current limit
Result: Breakdown at 8 msec, Ip = 20 kA, OH1 under control but Bz no good |
| May 12 1993 01:35:01:240PM | 930512014 | Martin Greenwald | - Intention: Raise EF3 to 2500 V (Undoes previous tweaks)
Result: No breakdown |
| May 12 1993 01:50:54:410PM | 930512015 | Martin Greenwald | - Intention: OH1 dropped from -500V to -300V
Gas to 8 x 10-5 Result: Breakdown at 11 msec, Ip = 17kA |
| May 12 1993 02:08:49:240PM | 930512016 | Martin Greenwald | - Intention: OH1 dropped to 0V
OH2 demand to 0V after commutation Result: Breakdown at 7 msec, Ip = 12 kA |
| May 12 1993 02:28:46:960PM | 930512017 | Martin Greenwald | - Intention: Moved turn on of EF3 1msec earlier
Result: Breakdown at 7 msec, Ip = 13 kA |
| May 12 1993 03:09:45:250PM | 930512018 | Martin Greenwald | - Intention: Raise EF1_ U&L commutation resistance from 201 to 253 mOhm
Result: Breakdown at 7 msec, Ip = 12 kA |
| May 12 1993 03:27:18:810PM | 930512019 | Martin Greenwald | - Intention: Lowered pressure to 6 x 10-5
Result: No OH2, No breakdown |
| May 12 1993 03:46:02:100PM | 930512020 | Martin Greenwald | - Intention: Lowered pressure to 6 x 10-5
Change OH2 demand to - 100V Result: Power Supply problem - no shot |
| May 12 1993 04:58:27:640PM | 930512022 | Martin Greenwald | - Intention: OH2 to +100V
Result: Breakdown at 9 msec, Ip = 22 kA Instabilities seen on visible/xray arrays |
| May 12 1993 05:37:09:720PM | 930512023 | Martin Greenwald | - Intention: Repeat
Result: Breakdown at 9 msec, Ip = 22 kA Instabilities seen on visible/xray arrays |
| Physics Operator Comments |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 07:13:55:760AM | Test | Bad | OH1 cap bank did not charge |
| 2 | 09:27:27:800AM | Test | Bad | power supplies did not trigger |
| 3 | 10:24:19:800AM | Test | Bad | No trig for power supplies |
| 4 | 10:31:08:730AM | Test | Ok | good plasma shot. |
| 5 | 10:49:03:810AM | Test | Ok | Good plasma shot |
| 6 | 11:06:54:010AM | Test | Ok | plasma shot Good |
| 7 | 11:56:58:180AM | Test | Ok | Good Plasma Shot |
| 8 | 12:10:04:470PM | Test | Ok | good plasma shot . |
| 9 | 12:24:56:620PM | Test | Ok | Good Plasma Shot. |
| 10 | 12:40:29:390PM | Test | Ok | Good Plasma Shot. |
| 11 | 12:54:52:450PM | Test | Bad | No Plasma P.S. Good |
| 12 | 01:06:48:550PM | Test | Ok | Good Plasma Shot Power Supplies O.K. |
| 13 | 01:19:24:280PM | Test | Ok | Good Plasma Shot Power Supplies O.K. |
| 14 | 01:33:06:710PM | Test | Bad | No Plasma Power Supply O.K. |
| 15 | 01:45:41:560PM | Test | Ok | Good Plasma Shot Power Supplies O.K. |
| 16 | 02:04:35:530PM | Test | Ok | Good Plasma Shot Power Supplies O.K. |
| 17 | 02:24:22:400PM | Test | Bad | EF1L came out first Pulling thr PF Breaker. |
| 18 | 03:03:08:220PM | Test | Bad | We had Plasma The PF breaker came out EF1L commmutation fail. |
| 19 | 03:24:58:690PM | Test | Bad | power supply Faulted |
| 20 | 03:42:51:850PM | Test | Bad | Plasma good Power Supplies EF1u&L OH1& OH2 L Commutation Faults. |
| 21 | 04:28:44:680PM | Test | Ok | We had Plasma But had a commutation fault on EF1u7L, OH1,OH2 L |
| 22 | 04:47:21:100PM | Plasma | Ok | We had plasma but the pf power suplies faulted. |
| 23 | 05:02:12:510PM | Plasma | Ok | Had Plasma But Pf Supplies faulted. |
| 24 | 05:20:56:290PM | Test | Ok | JOSH - testing state machine - seems to work |
| 25 | 05:28:38:300PM | Test | Ok | Josh Data system test - New state machine (OK) |