| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Unknown |
| Physics operator(s): | Earl Marmar |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| Purpose: Plasma Startup and Conditioning. |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:19:350PM |
| Author: Earl Marmar |
| 1031016 physop run summary continuing machine cleanup, rf conditioning and diagnostic checkout Start with lower single null. Possibly move to upper null later. Keep an eye on H/(H+D). PO Marmar ___________________________________________________________ ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight as well. Run begins at 09:00 and ends at 17:00. Power systems the same as on 1031015023 (0.8 MA, lower null) Gas setup: fill B-Top with 6 psi 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) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) Enable the following gate valves: ECE, VUV, DNB ----------------------------------------------------------------------- RF Setup: Transmitters 1,2 in RUN ON by 08:00 am ----------------------------------------------------------------------- Run Plan: Continue running cleanup plasmas while monitoring H/D, etc. RF Group will continue conditioning D & E. Summary: The run went reasonably well, but there were a lot of fizzles and duds. All plasma shots were lower single null. We tried 10 minutes of ECDC once between shots (before shot 21) and then got 3 plasmas in a row. Changes were mostly made to prefill pressure and EF4 at t=0. The RF ran D and E, getting ~1 MW into plasma from each, with up to 2 MW total when both were on at the same time.H/D started low on the first shot (~5%) and quickly rose to around 15% with RF power. It stayed roughly constant after that, falling a bit after the between shot ECDC. Scorecard: plasmas 18 fizzles 10 duds 6 total cycles 34 |
| Session Leader Comments |
| Physics Operator Comments | |||
| Oct 16 2003 08:51:45:970AM | Earl Marmar | continuing machine cleanup, rf conditioning and diagnostic checkout Start with lower single null. Possibly move to upper null later. Keep an eye on H/(H+D). | |
| Oct 16 2003 09:06:00:473AM | 1031016001 | Earl Marmar | load from 1031015002 load segment 2 from 1031015023 (lower single null, 800 kA) into model segment 2 plasma Disrupt at 0.48 s; breaker tripped on OH1, but plasma was heading south before that. |
| Oct 16 2003 09:19:48:747AM | 1031016002 | Earl Marmar | reduce prepuff by 2 msec; nl_04 to 0.8e20 from 1e20 plasma; full length |
| Oct 16 2003 09:38:35:247AM | 1031016003 | Earl Marmar | no pcs changes plasma H/(H+D) = .12 |
| Oct 16 2003 09:57:33:543AM | 1031016004 | Earl Marmar | no pcs changes plasma;; H/(H+D) = .12 to .14 |
| Oct 16 2003 10:08:17:240AM | 1031016005 | Earl Marmar | reduce clearin 5 mm rcur 2.5 mm (Bruce requested smaller inner gap for impurity measurements) plasma; got reduced inner gap; early marfe seems to be getting intense H/(H+D) = .16 |
| Oct 16 2003 10:21:34:700AM | 1031016006 | Earl Marmar | slow early current rise; raise Ip to .9 MA; nl_04 up to 1e20 plasma; early marfe much better; H/(H+D) ~ .15 |
| Oct 16 2003 10:43:32:807AM | 1031016007 | Earl Marmar | no pcs changes plasma; disrupt near end of flat-top, EF1U hit limit; lost the inner gap density increase at 0.5 seconds (dithering?) H/(H+D) = .14 to .16; .24 during disruption |
| Oct 16 2003 10:45:49:273AM | 1031016008 | Earl Marmar | reduce Ip 50 kA, reduce nl_04 to 9e19, decrease prepuff by 1 msec fizzle |
| Oct 16 2003 11:05:41:133AM | 1031016009 | Earl Marmar | reduce prepuff by 2 msec to 19 msec fizzle |
| Oct 16 2003 11:18:05:920AM | 1031016010 | Earl Marmar | no pcs changes plasma; funny density rise/dithering is gone H/(H+D) = .14 to .19 |
| Oct 16 2003 11:31:17:863AM | 1031016011 | Earl Marmar | no pcs changes fizzle |
| Oct 16 2003 11:39:58:747AM | 1031016012 | Earl Marmar | reduce BR_0 offset by .3 mT to 0.0002 dud |
| Oct 16 2003 11:52:10:003AM | 1031016013 | Earl Marmar | add 2 msec to prepuff dud |
| Oct 16 2003 12:06:02:727PM | 1031016014 | Earl Marmar | add 0.5 mT to BR_0 offset (now .0007 T) dud |
| Oct 16 2003 12:31:31:350PM | 1031016015 | Earl Marmar | EF4 20 amp more negative (now -1330) BR_0 offset back to 0.0005 plasma H/(H+D) = .11 to .18 |
| Oct 16 2003 12:43:28:807PM | 1031016016 | Earl Marmar | no pcs changes plasma H/(H+D) = .11 to .18 |
| Oct 16 2003 12:47:40:150PM | 1031016017 | Earl Marmar | no pcs changes fizzle |
| Oct 16 2003 01:06:15:493PM | 1031016018 | Earl Marmar | reduce prepuff by 1 msec fizzle |
| Oct 16 2003 01:21:53:607PM | 1031016019 | Earl Marmar | take another 10 A off EF4 plasma early marfe is back H/(H+D) = .13 to .19 |
| Oct 16 2003 01:32:49:567PM | 1031016020 | Earl Marmar | no pcs changes fizzle discharge clean for 10 minutes before shot 21 |
| Oct 16 2003 02:01:41:340PM | 1031016021 | Earl Marmar | ECDC for 10 minutes before this shot. Reduce prepuff by 1 msec add 10 msec to argon puff plasma H/(H+d) = .1 to .16 |
| Oct 16 2003 02:13:57:753PM | 1031016022 | Earl Marmar | no pcs changes plasma H/(H+D) = .1 to .15 |
| Oct 16 2003 02:34:26:457PM | 1031016023 | Earl Marmar | no pcs changes plasma H/(H+D) = .1 to .16 |
| Oct 16 2003 02:37:17:330PM | 1031016024 | Earl Marmar | no pcs changes fizzle |
| Oct 16 2003 02:54:43:723PM | 1031016025 | Earl Marmar | reduce prefill 1 msec (to 18 msec) plasma bouncy startup, with runaways H/(H+D) = .1 to .16 |
| Oct 16 2003 03:08:28:307PM | 1031016026 | Earl Marmar | add 1 msec to prepuff plasma no bounce, no hards H/(H+D) = .09 to .15 |
| Oct 16 2003 03:20:18:407PM | 1031016027 | Earl Marmar | no pcs changes fizzle |
| Oct 16 2003 03:32:16:973PM | 1031016028 | Earl Marmar | reduce prepuff by 1 msec to 18 msec reduce I_p by 50 kA tweak current rise after 0.1 seconds dud |
| Oct 16 2003 03:50:09:867PM | 1031016029 | Earl Marmar | add 2 msec to prepuff take 20 A off EF4 (now -1360) plasma H/(H+D) = .09 to .15 |
| Oct 16 2003 03:57:08:220PM | 1031016030 | Earl Marmar | no pcs changes fizzle |
| Oct 16 2003 04:12:58:063PM | 1031016031 | Earl Marmar | reduce prepuff 2 msec dud |
| Oct 16 2003 04:24:03:803PM | 1031016032 | Earl Marmar | add 2 msec to prepuff dud |
| Oct 16 2003 04:43:57:820PM | 1031016033 | Earl Marmar | add 20 amps back to EF4, now -1340 A plasma H/(H+D) = .09 to .15 |
| Oct 16 2003 04:56:06:297PM | 1031016034 | Earl Marmar | no pcs changes fizzle end of run |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:55:36:827AM | Plasma | Bad | OH1 self powered circuit fired |
| 2 | 09:13:07:750AM | Plasma | Ok | |
| 3 | 09:27:02:927AM | Plasma | Ok | |
| 4 | 09:44:30:773AM | Plasma | Ok | |
| 5 | 09:58:05:857AM | Plasma | Ok | |
| 6 | 10:13:30:610AM | Plasma | Ok | |
| 7 | 10:27:07:147AM | Plasma | Ok | |
| 8 | 10:42:33:887AM | Plasma | Ok | |
| 9 | 10:56:59:530AM | Plasma | Ok | |
| 10 | 11:10:03:973AM | Plasma | Ok | |
| 11 | 11:23:06:730AM | Plasma | Ok | |
| 12 | 11:36:04:733AM | Plasma | Ok | |
| 13 | 11:49:13:037AM | Plasma | Ok | |
| 14 | 12:02:40:027PM | Plasma | Ok | |
| 15 | 12:16:03:580PM | Plasma | Ok | |
| 16 | 12:29:14:380PM | Plasma | Ok | |
| 17 | 12:42:24:887PM | Plasma | Ok | |
| 18 | 12:58:23:750PM | Plasma | Ok | |
| 19 | 01:11:43:787PM | Plasma | Ok | |
| 20 | 01:26:31:993PM | Plasma | Ok | |
| 21 | 01:51:56:350PM | Plasma | Ok | |
| 22 | 02:05:40:197PM | Plasma | Ok | |
| 23 | 02:18:53:703PM | Plasma | Ok | |
| 24 | 02:33:02:050PM | Plasma | Ok | |
| 25 | 02:45:59:387PM | Plasma | Ok | |
| 26 | 02:59:17:813PM | Plasma | Ok | |
| 27 | 03:14:21:143PM | Plasma | Ok | |
| 28 | 03:27:31:603PM | Plasma | Ok | |
| 29 | 03:40:46:517PM | Plasma | Ok | |
| 30 | 03:53:48:647PM | Plasma | Ok | |
| 31 | 04:07:53:147PM | Plasma | Ok | |
| 32 | 04:21:01:307PM | Plasma | Ok | |
| 33 | 04:34:14:000PM | Plasma | Ok | |
| 34 | 04:52:00:847PM | Plasma | Ok | |