| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Bruce Lipschultz |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Vinny Bertolino |
| Engineering Operator Run Comment |
| strike point |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:12:693PM |
| Author: To Be Determined |
| run 950314 Engineering operator: V. Bertolino Physics operator J. Snipes Session leader BLip This run was supposed to be a continuation of mp #81 - 'effect of strike point position on the extent of detachment'. However, the leak before the run put an end to those plans. We then had 1.5 hours of ECDC and attempted to clean the machine back up by making tokamak plasmas. This, in the end, was somewhat successful. We were able to achieve consistent breakdown and current rise after shot 15. 600 kA plasmas actually ran through inversion. We had problems when we went back to 800kA with VDEs. The other accomplishment from this run was to try out remote control from California. Three shots (see physop summary) were run from there. The detailed listing of shots follows: shot 2-4: fizzle shot 5: plasma current of 300 kA and plenty of hard x-rays. shot 6-8: fizzle shot 9: 'plasma current' shot 10: 550 ms and full current (800 kA) but a mess. shot 11: fizzle shot 15: shot like 10 lasted to about 500 ms but was ugly. This one was a reload of shot from California. shot 16: again ugly plasma but it went. shot 17: again ugly plasma like 16 shot 18: This shot went all the way! It barely made it past 600 ms but after that things seemed to calm down. Not that the current was changed to 600 kA. shot 19: Pretty much a repeat of shot 18, 600kA. The main difference was an incredible MARFE early on that sweeps up the inner wall and back causing a large density rise. shot 20: Back to 800 kA but disrupted at around 550 ms due to VDE. shot 21: Again a disruption due to VDE. shot 22: fizzle |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:53:503PM |
| Author: To Be Determined |
| MP080 Strike Point Position Scan Engineer in Charge: Vince Bertolino Physicist in Charge: Joseph Snipes Session Leader: Bruce Lipschultz This run is intended to scan the density and modify the strike point position with both a flat plate divertor configuration and a vertical plate divertor configuration, both at the bottom of the vessel. We intend to complete both density scans at 0.8 MA and, if time remains, to repeat the vertical plate divertor scan at 1 MA. We copied shot 950202032, but raised the current to 0.8 MA and lowered the density to 7 x 10^19 m^-2. Also, RCUR was copied from shot 950202014. For shot 2, the startup segment was copied from shot 950307002 and the main segment from 950202014 because of the leak this morning. The run has been delayed for several reasons: 1) an alternator problem, 2 vacuum leak that opened up on one of the bottom flanges when the bottom heating tapes were raised to 80% of maximum to remove some frost, 3) a server problem that made the HYBRID COLDSTART hang. The program of strike point position scan was not attempted. Instead, some progress was made at cleaning up the machine from the vacuum accident and remote machine operation was successfully done for shots 16, 17, and 18 by Steve Horne at LLNL. Shot 1: OH test shot. 2: Fizzle 3: Fizzle 4: Fizzle 5: Short plasma to 0.4 sec 6: Fizzle 7: Test shot. 8: Fizzle 9: Short plasma to 0.35 sec 10: Short plasma to 0.55 sec 11: Fizzle 12: Fizzle 13: Fizzle 14: Fizzle 15: Fizzle 16: Horne's shots: short plasma to 0.45 sec 17: short plasma to 0.47 sec 18: long plasma to 1.6 sec 19: I took over again. Another long plasma. 20: Raised Ip to 0.8 MA, disrupted at 0.5 sec 21: Disrupted at 0.45 sec. 22: Fizzle 9 plasmas, 11 fizzles, 2 test shots. |
| Session Leader Comments | |||
| Mar 14 1995 10:34:50:980AM | Bruce Lipschultz | run 950314
Engineering operator: V. Bertolino Physics operator J. Snipes Session leader BLip This run is a continuation of mp #81 - 'effect of strike point position on the extent of detachment'. We intend to run a number of constant density shots at 800kA with a flat-plate divertor; density varied shot by shot from 0.7 to 2 e20 (nl04). We then hope to finish the vertical plate scan that was not completed on 950202. Data points at low and high density are needed as well as trying to better diagnose the high plasma pressure found in the divertor at the onset of detachment (Brian calls this the 'death ray'). WE had intended to start this work at 1 MA as well today but given the problems with a leak and the alternator forcing a late start we will be lucky if we can get any data. We will start the run by just trying to get a standard diverted shot (normal strike point position on vertical plate). | |
| Mar 14 1995 12:28:00:920PM | 950314005 | Bruce Lipschultz | shot 1: test
shot 2-4: fizzle shot 5: plasma current of 300 kA and plenty of hard x-rays. |
| Mar 14 1995 02:22:43:980PM | 950314009 | Bruce Lipschultz | shot 6-8: fizzle
shot 9: 'plasma current' |
| Mar 14 1995 02:30:35:470PM | 950314010 | Bruce Lipschultz | shot 10: 550 ms and full current (800 kA) but a mess.
|
| Mar 14 1995 02:31:04:620PM | 950314010 | Bruce Lipschultz | shot 10: 550 ms and full current (800 kA) but a mess.
|
| Mar 14 1995 02:38:34:850PM | 950314011 | Bruce Lipschultz | shot 11: fizzle
|
| Mar 14 1995 03:47:52:500PM | 950314016 | Bruce Lipschultz | shot 16: again ugly plasma but it went.
|
| Mar 14 1995 04:04:17:780PM | 950314017 | Bruce Lipschultz | shot 17: again ugly plasma like 16
|
| Mar 14 1995 04:05:22:670PM | 950314018 | Bruce Lipschultz | shot 18: This shot went all the way! It barely made it past 600 ms but
after that things seemed to calm down. |
| Mar 14 1995 04:22:49:310PM | 950314019 | Bruce Lipschultz | shot 19: Pretty much a repeat of shot 18, 600kA. The main difference was
an incredible MARFE early on that sweeps up the inner wall and back causing a large density rise. |
| Mar 14 1995 04:24:26:650PM | 950314019 | Bruce Lipschultz | shot 19: Pretty much a repeat of shot 18, 600kA. The main difference was
an incredible MARFE early on that sweeps up the inner wall and back causing a large density rise. |
| Mar 14 1995 04:38:52:740PM | 950314020 | Bruce Lipschultz | shot 20: Back to 800 kA but disrupted at around 550 ms due to VDE.
|
| Mar 14 1995 04:39:29:640PM | 950314021 | Bruce Lipschultz | shot 21: Again a disruption due to VDE.
|
| Mar 14 1995 05:13:19:570PM | 950314022 | Bruce Lipschultz | shot 22: fizzle
|
| Physics Operator Comments | |||
| Mar 10 1995 04:37:51:360PM | Joseph Snipes | This run is intended to scan the density and modify the strike point
position with both a flat plate divertor configuration and a vertical plate divertor configuration, both at the bottom of the vessel. We intend to complete both density scans at 0.8 MA and, if time remains, to repeat the vertical plate divertor scan at 1 MA. We copied shot 950202032, but raised the current to 0.8 MA and lowered the density to 7 x 10^19 m^-2. Also, RCUR was copied from shot 950202014. | |
| Mar 14 1995 08:46:49:500AM | Joseph Snipes | The run has been delayed for several reasons: 1) an alternator problem, 2) a
vacuum leak that opened up on one of the bottom flanges when the bottom heating tapes were raised to 80% of maximum to remove some frost, 3) a server problem that made the HYBRID COLDSTART hang. We will try to start by 10:30 am if we can resolve these problems. | |
| Mar 14 1995 10:54:05:620AM | Joseph Snipes | Because the machine is dirty, we have decided to start a standard 800 kA
plasma copying segment 1 from 950307002 and segment 2 from 950202014 with the density reduced to 7.3 x 10^19 m^-2. First, there will be the OH2 test shot. | |
| Mar 14 1995 11:35:48:780AM | 950314001 | Joseph Snipes | Shot 1
OH test shot. O.K. |
| Mar 14 1995 11:46:48:100AM | 950314002 | Joseph Snipes | Shot 2
Attempt to get a standard SNB 0.8 MA discharge at 7.3 x 10^19 m^-2. Fizzle! |
| Mar 14 1995 11:59:46:520AM | 950314003 | Joseph Snipes | Shot 3
Raised Br by 1 mT to 7 mT. Instrumentation problems in engineering slowing us down a bit. Fizzle! |
| Mar 14 1995 12:16:36:110PM | 950314004 | Joseph Snipes | Shot 4
Lowered Br by 0.5 mT to 6.5 mT. Fizzle! |
| Mar 14 1995 12:25:17:470PM | 950314005 | Joseph Snipes | Shot 5
Raised EF4 current by 20 A to 1105 A before t = 0. Got some plasma, but lots of hard x rays. |
| Mar 14 1995 12:32:35:890PM | 950314006 | Joseph Snipes | Shot 6
Raised prefill to 2.3 x 10^-5 Torr. Fizzle! |
| Mar 14 1995 01:20:27:040PM | 950314006 | Joseph Snipes | Shot 6
DAQ3 problems slowing us down. |
| Mar 14 1995 01:31:55:000PM | 950314006 | Joseph Snipes | Shot 6
Turning on ECDC while we wait to resolve the DAQ3 CAMAC problem. |
| Mar 14 1995 01:55:35:890PM | 950314007 | Joseph Snipes | Shot 7
Test shot. O.K. |
| Mar 14 1995 02:10:10:340PM | 950314008 | Joseph Snipes | Shot 8
Lowered prefill to 1.9 x 10^-5 Torr. Fizzle! |
| Mar 14 1995 02:29:22:600PM | 950314009 | Joseph Snipes | Shot 9
Repeat. Short plasma to 0.35 sec. |
| Mar 14 1995 02:29:54:310PM | 950314010 | Joseph Snipes | Shot 10
Repeat. Short plasma to 0.55 sec. Reached 0.8 MA. |
| Mar 14 1995 02:34:31:890PM | 950314011 | Joseph Snipes | Shot 11
Repeat. Fizzle! |
| Mar 14 1995 02:51:51:570PM | 950314012 | Joseph Snipes | Shot 12
Repeat. Fizzle. Wolfe noticed that the EF2 start time was not what was used for the 950307 run. I realized that I asked engineering to start with parameters from shot 950202014, which is the segment 2 that I am using, but I should have asked for shot 950307002, which is the segment 1 I am using. Try the 950307003 parameters for shot 13 and see what happens. |
| Mar 14 1995 03:00:14:070PM | 950314013 | Joseph Snipes | Shot 13
Fizzle! |
| Mar 14 1995 03:09:46:370PM | 950314013 | Joseph Snipes | Shot 14
Returned to startup programming from 950307002 with Br = 6 mT, and EF4 at 1085 A before t = 0. Fizzle. |
| Mar 14 1995 03:29:23:670PM | 950314015 | Joseph Snipes | Shot 15
Repeat. Fizzle. Run turned over to Horne for two shots to see if he can do it from LLNL and to see if he can improve things. |
| Mar 14 1995 03:39:49:650PM | 950314016 | Joseph Snipes | Shot 16
Horne set prefill to 1.6 x 10^-5 Torr, Br reset to 6.5 mT. Got plasma out to 0.45 sec. Horne had reduced the early gas puff a bit. |
| Mar 14 1995 04:01:40:630PM | 950314018 | Joseph Snipes | Shot 18
Horne reduced early gas a bit. Better shot lasted to 1.6 sec. |
| Mar 14 1995 04:16:39:180PM | 950314019 | Joseph Snipes | Shot 19
I'm taking control again. Reduced early gas a bit more. Raised prefill back to 1.8 x 10^-5 Torr. Looked ok, but current dips at 0.4 sec. |
| Mar 14 1995 04:29:05:150PM | 950314020 | Joseph Snipes | Shot 20
Increased CLEARIN from -2 mm to +4 mm. Raised Ip to 0.8 MA. Disrupted at 0.5 sec. |
| Mar 14 1995 04:44:37:300PM | 950314021 | Joseph Snipes | Shot 21
Reduced proportional gain on slow ZCUR wire 2 from 3 to 1.5. Lowered prefill to 1.6 x 10^-5 Torr after the disruption on shot 20. Expect a fizzle. Got a plasma that disrupted at 0.45 sec. |
| Mar 14 1995 04:53:39:990PM | 950314022 | Joseph Snipes | Shot 22
Reduced early gas puff some more. Engineering changing some EF3 boards. Proportional gain on fast ZCUR wire 3 extended to 0.6 sec at a value of 8, then drops to 5 as before. Fizzle. |
| Mar 14 1995 05:00:02:310PM | 950314022 | Joseph Snipes | Shot 22
Reduced early gas puff some more. Engineering changing some EF1 boards. Proportional gain on fast ZCUR wire 3 extended to 0.6 sec at a value of 8, then drops to 5 as before. Fizzle. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 11:19:20:260AM | Test | Ok | coax test |
| 2 | 11:39:02:110AM | Plasma | Ok | no faults |
| 3 | 11:57:13:790AM | Plasma | Ok | no faults |
| 4 | 12:09:17:590PM | Plasma | Ok | no faults |
| 5 | 12:20:10:940PM | Plasma | Ok | no faults |
| 6 | 12:30:08:930PM | Plasma | Ok | no faults |
| 7 | 01:53:25:290PM | Test | Ok | CAMAC TEST. O.K. |
| 8 | 02:02:59:550PM | Plasma | Ok | NO FAULTS. |
| 9 | 02:11:30:170PM | Plasma | Ok | COMM FAULT OH2U |
| 10 | 02:20:48:840PM | Plasma | Ok | COMM FAULT EF1L, OH2 U&L |
| 11 | 02:31:32:260PM | Plasma | Ok | NO FAULTS. |
| 12 | 02:44:02:830PM | Plasma | Ok | NO FAULTS. |
| 13 | 02:53:56:340PM | Plasma | Ok | NO FAULTS |
| 14 | 03:06:35:520PM | Plasma | Ok | NO FAULTS. |
| 15 | 03:16:18:540PM | Plasma | Ok | NO FAULTS. |
| 16 | 03:31:01:440PM | Plasma | Ok | no faults |
| 17 | 03:43:36:250PM | Plasma | Ok | EF1 L Comm Fault |
| 18 | 03:56:52:490PM | Plasma | Ok | No Faults. |
| 19 | 04:09:04:600PM | Plasma | Ok | No Faults. |
| 20 | 04:24:28:360PM | Plasma | Ok | No Faults. |
| 21 | 04:35:19:860PM | Plasma | Ok | no faults |
| 22 | 04:50:09:110PM | Plasma | Ok | No Faults |