| Miniproposals | ||||||||||||
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| Operators | |
| Session leader(s): | Earl Marmar,Earl Marmar |
| Physics operator(s): | Earl Marmar |
| Engineering operator(s): | Frank Silva |
| Engineering Operator Run Comment |
| silva, in the con |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:09:023PM |
| Author: To Be Determined |
From: ZENITH::MARMAR Date: 4-OCT-1993 22:36:14 Description: Session leader summary 931001 931001 Between shot ECDC; D2 plasma working gas. The main purpose of the run was to investigate the effects of between-shot ECDC, particularly with regard to post disruption cleanup. Developing higher elongation and measuring growth rates of vertical instabilities were piggy-back goals. We mostly did the ECDC in He, with the exception of between shots 11 and 12, where it was done in D_2. All ECDC was performed with fill pressure of 5e-4 Torr (gauge). In general, after each fast VDE (induced by turning off EFC feedback at high kappa), we had at least one fizzle. The exceptions were shot 11 (no ECDC before), and shot 14 (preceeded by 10 minutes of He ECDC). While there are too few shots to allow for definite conclusions, it does not appear that the ECDC after a disruption prevented a subsequent fizzle. In fact, it appeared that the ECDC may have made things slightly worse. In particular, shot 11 went after the 600 kA VDE on shot 10 (although 11 was not pretty during the breakdown and current rise phase). Measurements of low Z impurity light, as well as H-alpha and He Lyman-alpha, were made, but no obvious conclusions have yet emerged. It is a fact that the RGA spectrum on Monday was about as clean as it has ever been (there was also a 60 degree mini-bake on Saturday). My shot by shot summary follows. 1 power supply problems dud 2 attempt again; late breakdown fizzle 3 OH2l did not reverse. 600 kA, then ramping down at .4s plasma VDE down at .64s, 300kA. 4 600 kA, no disruption, Z~1.5, 380 kW rad power plasma 5 600 kA, VDE plasma attempted to ECDC in He, but it tripped after about 2 seconds 6 still having some OH2l problems, but this is not the fizzle cause of the fizzle. After 6, we ECDC'd for 10.0 minutes in helium. 7 slightly better breakdown fizzle after 7, ECDC'd in He for 10.4 minutes 8 EF2 lower problem. dud no ECDC after shot 8. 9 very similar to 7, slightly better breakdown fizzle no ECDC after shot 9 10 600 kA, VDE up at .76 s, Mo injection at .66 s. plasma no ECDC after shot 10 11 600 kA, VDE up at .74 s, high kappa plasma 10.0 minutes ECDC in D2 after shot 11 12 fizzle fizzle 10 minutes ECDC in He after shot 12 13 600 kA, VDE up at .71 s, Mo injections throughout plasma 10 minutes ECDC in He after shot 13 14 200 kA, disrupt at .16 s. plasma no ECDC after shot 14 15 600 kA, VDE up =at .76 plasma ECDC for 10 minutes in He after shot 15 16 late breakdown, B_R uptick? fizzle ECDC for 7 minutes in He after shot 16 17 very late breakdown, another B_R spike fizzle ECDC for 7 minutes in He after shot 17 18 breakdown at normal time fizzle no ECDC after shot 18 19 600 kA, VDE up at .77 s plasma no ECDC after shot 19 20 breakdown at normal time fizzle 21 delay pulsed gas 2 msec; pellet attempt at .5 s; disrupt at plasma .54 s, following pellet; 540 kA VDE; no ECDC after shot 21. 22 fizzle fizzle no ECDC after shot 22 23 lower fill to 1.0e-5 (it had been 1.1e-5 up to now all day) plasma high density (>1e20), disrupt at .42 s, 413 kA 5 minutes ECDC in He after shot 23 24 lower fill to 9.0e-6; bounced on outer limiter early fizzle no ECDC after 24 25 some field tweaks (lowered B_R) dud 11 plasma, 11 fizzles, 2 power supply duds, 1 other dud. |
| Physics Operator Summaries |
| Session Leader Comments | |||
| Oct 1 1993 09:06:32:600AM | Earl Marmar | Today's run:
Mini-poroposal 31, between shot ECDC. Piggy back is MP24, High kappa. Start from 930930005 with some tweaks. | |
| Oct 1 1993 09:44:32:860AM | 931001002 | Earl Marmar | Fizzle; late breakdown.
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| Physics Operator Comments |
| Engineering Operator Comments | |||||||||||||||||||
| Shot | Time | Type | Status | Comment | |||||||||||||||
| 1 | 09:06:51:960AM | Plasma | Bad | multiple ps problems | |||||||||||||||
| 2 | 09:27:53:450AM | Plasma | Bad | oh2 comm fail | |||||||||||||||
| 3 | 09:47:25:910AM | Plasma | Bad | oh2 fault | |||||||||||||||
| 4 | 10:02:19:060AM | Plasma | Ok | no faults plasma | |||||||||||||||
| 5 | 10:17:09:300AM | Plasma | Ok | Power supplies O.K. | |||||||||||||||
| 6 | 10:38:47:700AM | Plasma | Ok | No faults Fizzle | |||||||||||||||
| 7 | 11:03:24:140AM | Plasma | Ok | ecdc between shot 6&7 | |||||||||||||||
| 8 | 11:28:13:830AM | Plasma | Bad | ef2 unscheduled output faulse | |||||||||||||||
| 9 | 11:46:44:950AM | Plasma | Ok | water leak fe2 la | |||||||||||||||
| 10 | 12:21:43:460PM | Plasma | Bad | plasma ps ok | |||||||||||||||
| 11 | 12:36:38:330PM | Plasma | Ok | plasma | |||||||||||||||
| 12 | 01:01:45:610PM | Plasma | Ok | ecdc bd | |||||||||||||||
| 13 | 01:28:42:250PM | Plasma | Ok | ok | |||||||||||||||
| 14 | 01:49:28:900PM | Plasma | Ok | No faults | |||||||||||||||
| 15 | 02:04:17:040PM | Plasma | Ok | ok ecdc between shot | |||||||||||||||
| 16 | 02:26:40:540PM | Plasma | Ok | ecdcplasma | |||||||||||||||
| 17 | 02:45:32:420PM | Plasma | Ok | ecdc between shots | |||||||||||||||
| 18 | 03:06:01:590PM | Plasma | Ok | ecdc between shots | |||||||||||||||
| 19 | 03:20:48:520PM | Plasma | Ok | oh2 lower fault | |||||||||||||||
| 20 | 03:45:37:710PM | Plasma | Ok | No faults fizzle | |||||||||||||||
| 21 | 03:58:50:550PM | Plasma | Ok | plasma | |||||||||||||||
| 22 | 04:16:22:280PM | Plasma | Ok | fiz| 23 | 04:31:10:170PM | Plasma | Bad | Comm Fail OH2U&L, EF1 OH1 | 24 | 04:48:05:550PM | Plasma | Ok | plasma | 25 | 05:02:38:600PM | Plasma | Ok | last shot dud | |