| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | D Jablonski |
| Physics operator(s): | Yuichi Takase |
| Engineering operator(s): | Frank Silva,Vinny Bertolino |
| Engineering Operator Run Comment |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:12:180PM |
| Author: To Be Determined |
| Run 950207 was meant to perform the program layed out in MP #71B. No useful data was obtained. A brief outline of the debacle is given below. Shots 1-2: OH Tests. Between shots 2 and 3: In cell access to fix TCI. Shots 3-6: Fizzles and duds. The second to last shot from Friday (950203034) was used as starting point. Shot 7: By playing around with the prefill and field levels a decent shot was had. Much H-Mode action was observed. In order to make this shot useful, the density needed to be lowered, and the left gap needed to be increased and steadied. Shots 8-12: Development of shot to use as 'basis shot' for rest of run. By shot 12, shot was deemed acceptable. Shots 11 and 12 used preprogrammed A-side gas voltage copied from the feedback controlled gas voltage of shot 10. Shot 13: Shot was probably fine as final 'basis shot' for run, but TCI went out of commission. Between shots 13 and 14: In cell access to fix TCI. Shots 14-16: Attempted to repeat shot 13 without luck. Got fizzles. By shot 16, were able to get back to non-fizzle which would be an acceptable basis shot. Shots 17-18: Fizzles. Unable to repeat luck of shot 16. Shots 19-20: Dropped ramp TF start-up program. Began using start-up from shot 950207016. With shot 20, got an acceptable baseline shot. Shot 21: Copied feedback controlled piezo voltage from shot 20 into preprogramming. Ran shot puffing through NINJA at B26-019 (private flux region). Background density higher than what would be desirable, but not enough time left in run to correct. Shot 22: Fizzle. Shot 23: Ran same as in Shot 21 without the NINJA puffing. This in theory should serve as the baseline with which to judge the effect of the NINJA puffing in shots 21 and 24. Unfortunately the baseline does not appear repeatable enough to get desired data for the size of gas puffs in 21 and 24. Shot 24: Same shot with puffing through B31-086 (outer divertor nose). Because of unsteadiness of the baseline (variation in density background), little useful data will be obtained from the puffing shots. For the amount of density variation and the absolute level of the background density (about twice that desired), a larger NINJA puff would have been needed to get useful data. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:53:113PM |
| Author: To Be Determined |
| SL: Jablonski PO: Takase EO: Silva/Bertolino This was a disastrous run with numerous problems (a close competitor to John Rice's 2-D neutral density runs). The last shot from last Friday's highly successful run was loaded. The start-up segment had the low-field start-up developed by Ian on 950201. After some tweaking of BR and prefill, we seemed to be on the right track. The inner/outer gaps and the strike points were adjusted and a low-density preprogrammed gas puff shot was established as the baseline shot for the capillary gas experiment (shots 08-12). We had two controlled cell accesses for TCI. After the second cell access, we had a series of duds and fizzles. On shot 018 we had a TF failure in which when the power supply went into inversion (still during the TF ramp) a current increase was observed in two converters while a current decrease was observed on the other two. The engineering group will be looking into this problem. The low field startup was abandoned and we loaded a full-field startup into seg. 1. Thereafter, things went reasonably well. Limited data were obtained with the capillary gas puff. Starting from 950203035 OH2L 30kA tests yesterday, reconfigured back after test D2 ECDC for 2hrs before the run A side plenum purged and filled with D2 20psi Shot changes 01 PT OH2L test 02 PT OH coax test * cell access for TCI (replaced water chiller) 03 Dud Start with 2.0e-5 fill OH1 switch didn't close 04 Fiz Null looks OK 05 Dud drop fill to 1.6e-5 06 Fiz Raise BR by +.5mT, fill 2.2e-5 07 Fiz fill 1.8e-5 08 Pla Raise BR by +.5mT 09 Pla lower P gain on nel feedback 8 -> 6 10 Pla nel_04 set to 0.6 ZXL down by 3mm, clearin more by 5mm 11 Pla turn off nel fb (paste gas from shot 10) clearin prog -.002 -> +.002 12 Pla RXL smaller by 2mm changed clearin I gain start to .38sec clearin prog @ 0.000 No TCI * cell access for TCI (beam realignment) 13 Dud clearin +.002 -> +.005 BR too positive (coil temp?) 14 fiz lower BR0 to 5.5e-3 extremely weak fizzle 15 Fiz raise fill to 2.0e-5 blew TF fuses 16 Pla raise BR by .5mT good inner/outer gap 17 Fiz no change late breakdown 18 Fiz raise fill to 2.4e-5 TF PS problem 19 Dud load seg 1 from 950202036 nel=0.6 fb, fill 1.8e-5 TF timing wasn't changed 20 Pla inner/outer gap = 1.4/1.9cm 21 Pla nel fb off (paste gas from shot 20) got higher density, capillary puff on 22 Fiz no change plasma moved out DAQ1 error 23 Pla fill 2.0e-5 capillary off 24 Pla capillary on |
| Session Leader Comments | |||
| Feb 7 1995 10:09:51:920AM | 950207003 | D Jablonski | Starting with shot 950203034. NINJA is purged in order to give absolute
gauge baseline (zero reading). Fizzle. OH1 problem. |
| Feb 7 1995 10:29:28:510AM | 950207004 | D Jablonski | Fizzle.
|
| Feb 7 1995 10:35:38:810AM | 950207005 | D Jablonski | Lowered prefill. Fizzle.
|
| Feb 7 1995 10:55:05:910AM | 950207006 | D Jablonski | Changed fields and raised fill. Fizzle.
|
| Feb 7 1995 11:37:02:070AM | 950207008 | D Jablonski | Messed around a bunch and got a shot. Lots of H-mode action.
|
| Feb 7 1995 11:52:21:730AM | 950207009 | D Jablonski | Similar to previous shot.
|
| Feb 7 1995 12:11:32:860PM | 950207010 | D Jablonski | Lowered A-side gas puff feedback to nl_04 of 6e19, lowered strike points,
and widened left gap. Nice shot except for drifting left gap. |
| Feb 7 1995 12:30:57:600PM | 950207011 | D Jablonski | Corrected for left gap (to steady) and copied feedback resultant
gas puff into preprogrammed trace. Fine shot (density a bit lot, but oh well), will try to better steady left gap on next shot. |
| Feb 7 1995 01:10:15:680PM | 950207012 | D Jablonski | Corrected for left gap (to steady). Shot was probably great, but had
no TCI to tell. Will stick with it as basis shot for rest of run. |
| Feb 7 1995 01:27:03:350PM | 950207012 | D Jablonski | Corrected for left gap (to steady). Shot was probably great, but had
no TCI to tell. Will stick with it as basis shot for rest of run. |
| Feb 7 1995 02:01:53:330PM | 950207013 | D Jablonski | Had to shut down to let J. Irby fix TCI. Same settings as last time,
got fizzle. |
| Feb 7 1995 03:16:00:020PM | 950207016 | D Jablonski | Great Shot. The basis shot for the rest of the run. NPART_EFIT of
6e19 at .5 and 8e19 at 1.0. Life is kind of a mystery. |
| Feb 7 1995 03:20:16:760PM | 950207017 | D Jablonski | B26-19 open at .45 sec for .1 sec (NINJA injection). Fizzle.
|
| Feb 7 1995 03:30:52:950PM | 950207018 | D Jablonski | B26-19 open at .43 sec for .1 sec (NINJA injection). Fizzle.
|
| Feb 7 1995 04:03:54:840PM | 950207019 | D Jablonski | Decided problem was with newfangled start-up. Took startup from shot
950202036, and kept rest of 950207016. No NINJA. Density feedback back on for nl_04 of 6e19. Fizzle because TF settings not correct. |
| Feb 7 1995 04:20:44:220PM | 950207020 | D Jablonski | Good Shot. Hopefully the latest, greatest, and last basis shot. (cor-
rected the TF problem.) |
| Feb 7 1995 04:32:38:450PM | 950207021 | D Jablonski | B26-019 NINJA shot at .43s for .1s, plenum pressure of 816torr. All
else same as last shot in theory. In practice, background density altered. 22 will be basis shot. |
| Feb 7 1995 04:36:59:330PM | 950207022 | D Jablonski | Same as last shot without puff. Fizzle.
|
| Feb 7 1995 04:46:40:190PM | 950207023 | D Jablonski | Upped prefill (plasma moved out in previous shot). DAQ1 messed up and
shot needed to be aborted. |
| Feb 7 1995 05:01:59:290PM | 950207023 | D Jablonski | 23 unaborted after DAQ1 fixed up. Shot went. Use as basis. Density
too high, but life's tough. |
| Feb 7 1995 05:07:45:280PM | 950207024 | D Jablonski | B31-086 at .43s for .1s. Plenum press of 810 torr. Shot went. Should
be same as 23 except for puff. Reality is it's not (before .4 sec dens. is LOWER in shot 24). Perhaps no usable data in RUN. |
| Physics Operator Comments |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:25:19:220AM | Test | Ok | oh2l open ckt. test |
| 2 | 08:37:08:500AM | Test | Ok | co-ax test oh1, oh2u,l |
| 3 | 10:01:48:490AM | Plasma | Ok | oh1 switch did not close |
| 4 | 10:19:57:050AM | Plasma | Ok | no faults |
| 5 | 10:33:48:760AM | Plasma | Ok | no faults, no plasma |
| 6 | 10:52:51:280AM | Plasma | Ok | no faults, no plasma |
| 7 | 11:07:03:490AM | Plasma | Ok | no faults no plasma |
| 8 | 11:25:12:880AM | Plasma | Ok | no faults |
| 9 | 11:39:52:980AM | Plasma | Ok | no faults |
| 10 | 11:57:41:090AM | Plasma | Ok | no faults |
| 11 | 12:15:59:140PM | Plasma | Ok | no faults, plasma |
| 12 | 12:40:57:180PM | Plasma | Ok | no faults, plasma |
| 13 | 01:49:29:100PM | Plasma | Ok | no faults |
| 14 | 02:05:08:120PM | Plasma | Ok | no faults |
| 15 | 02:17:23:700PM | Plasma | Ok | tf comm fault in inversion |
| 16 | 03:03:22:850PM | Plasma | Ok | NO FAULTS, PLASMA |
| 17 | 03:15:29:120PM | Plasma | Ok | NO FAULTS |
| 18 | 03:28:04:440PM | Plasma | Ok | NO FAULTS |
| 19 | 03:58:21:100PM | Plasma | Ok | NO FAULTS |
| 20 | 04:09:35:730PM | Plasma | Ok | NO FAULTS, PLASMA |
| 21 | 04:22:26:170PM | Plasma | Ok | NO FAULTS,PLASMA |
| 22 | 04:34:27:600PM | Plasma | Ok | NO FAULTS,PLASMA |
| 23 | 04:44:02:390PM | Plasma | Ok | NO FAULTS, PLASMA |
| 24 | 05:00:56:380PM | Plasma | Ok | NO FAULTS, PLASMA |