| Miniproposals | ||||||||||||
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| Operators | |
| Session leader(s): | Steve Wolfe,Ian Hutchinson |
| Physics operator(s): | Ian Hutchinson |
| Engineering operator(s): | Gary Dekow |
| Engineering Operator Run Comment |
| Boronization Recovery/RF conditioning; SL:Hutch/Wolfe; PO: Hutch; EO:Dek |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:17:787PM |
| Author: To Be Determined |
Physop Summary for 1031515 Thursday, 15 May 2003 MP 329 Plasma Initiation without Commutation. Session leader: Hutch/Wolfe Physics operator: Hutch Summary _______ The major objective of demonstrating plasma initiation without commutation was achieved. Two full-length plasmas were obtained. However, despite early successes, a problem with frequent duds, even on settings that had previously run today with full plasmas, was encountered. Several sallies into surrounding parameter space were undertaken without discovering a place that was obviously better than the configuration of the shots that went. Therefore it remains to be established whether the commutationless startup is or can be made robust. It was demonstrated that we have plenty of power supply flexibility to control field and null configuration and evolution at loop voltages up to almost 6V per turn without commutation. Earliest ionization occurs at about t=10 ms. This is reasonably in accord with a scaling t.E = constant. Scorecard _________ In lieu of the usual scorecard, a summary table of shots. 03 Standard shot for fiducial. ms Shot Bdwn Ip(kA) Bz@10ms. Br@10ms Null description 04 16 0 2.7 05 0 0 4.6 06 0 0 2.3 07 21 0 1.6 08 10 16 -.2 09 10 15 0.0 10 10 13 -.2 11 10 13 -.7 12 0 0 2.3 13 12 150 1.5 0. Medium 14 11 800 0.4 -.4 Medium 15 13 19 0.9 -.6 Medium 16 0 0 0.3 0.1 Medium 17 0 0 -.9 0. Closed 18 0 0 1.9 -.5 Open 19 0 0 0.2 0. Open 20 0 0 2.1 -.3 Open 21 0 0 0.3 -.3 Reload 14 22 15 800 1.2 0. Medium 23 14 10 1.2 0. Reload 19 24 15 11 2.3 -.1 Open 25 0 0 -.2 -.3 Open 26 0 0 0.9 -.4 Open 27 0 0 1.0 -.3 Open 28 0 0 1.4 0. Open 29 0 0 1.25 -.4 Reload 20 30 0 0 1.2 -.3 Open 31 0 0 0.9 -.2 Reload 22 32 0 0 1.2 -.4 Medium 33 13 7 1.7 0.2 Medium (after ECDC) 34 0 0 1.9 0.3 Medium Details _______ Entry display output on Thu May 15 16:57:35 2003 ---------------------------------------------------------------------------- 1030515xxx hutch PHYSICS_OPERATOR May 15 2003 8:56:02:640AM . . . . . . . . . . . . . . . . . . . . Load from 10314002 for first shot. Set density feedback gain to zero. Load clean ---------------------------------------------------------------------------- 1030515003 hutch PHYSICS_OPERATOR May 15 2003 9:15:51:670AM . . . . . . . . . . . . . . . . . . . . Plasma. First plasma shot attempt. Full length. Under preprogrammed gas puff. Now we switch off commutation and adjust the voltages. Draw OH1 to +600V. OH2 to +150V EF1 to +400V Each are symmetrically copied into the upper and lower. Draw EF3 Voltage to +1300V. Load ---------------------------------------------------------------------------- 1030515004 hutch PHYSICS_OPERATOR May 15 2003 9:43:37:696AM . . . . . . . . . . . . . . . . . . . . Got a minor flash at 16ms. Fields show a slowly increasing Br as desired, but a strong curvature, not desired. I had forgotten to lower the pressure. We get about .08 mtorr. Got a loop voltage of about 5.5V but it ramps up during the first 10 ms. Got 600 V out of OH1, 190V OH2U, 230V OH2L. 400V EF2s. There is a problem with the OH2s going in different directions later in the shot we probably need to bring the fizzle detector earlier. Adjustments: Fizzle detector OHs to 300ms. OH1 to 700V OH2s to 135V Pulse Gas 4 fill puff to 18ms from 27ms. Br offset to 1.5mT from 0.5mT. ---------------------------------------------------------------------------- 1030515005 hutch PHYSICS_OPERATOR May 15 2003 10:04:51:400AM . . . . . . . . . . . . . . . . . . . . No light. OH1V got 600V. Still got over 200V on OH2. Seems not to follow demand. Perhaps an integral feedback issue. No ratiomatic data. Adjustments: Fill puff to 20ms. Round out the rise of OH2s to prevent saturation. EF3 V to 1100V. ---------------------------------------------------------------------------- 1030515006 hutch PHYSICS_OPERATOR May 15 2003 10:18:49:236AM . . . . . . . . . . . . . . . . . . . . No light. Got .057mtorr. OH2 adjustment was in the right direction but not enough. Adjustments: OH2 ramp even slower to prevent saturation. EF3 voltage to 900V in first 5ms. ---------------------------------------------------------------------------- 1030515007 hutch PHYSICS_OPERATOR May 15 2003 10:34:26:540AM . . . . . . . . . . . . . . . . . . . . Fizzle. Very late breakdown 20ms but lasts till 45ms. Bz swings quickly positive and then back down. It seems that the breakdown occurs on the second minimum. Adjustments: Drop the OH2 early points some more. EF3 first point made into a slow ramp. ---------------------------------------------------------------------------- 1030515008 hutch PHYSICS_OPERATOR May 15 2003 10:49:55:093AM . . . . . . . . . . . . . . . . . . . . Fizzle. Bdown at 10ms. 15kA current. This is very promising but the current can't get going because the Bz is still swinging back negative at the time the plasma is starting. EF3 voltage to 1200 at 6ms. Try to remove the Bz dip. ---------------------------------------------------------------------------- 1030515009 hutch PHYSICS_OPERATOR May 15 2003 11:07:33:873AM . . . . . . . . . . . . . . . . . . . . Fizzle. Almost identical 15kA, slightly faster Halpha rise. EF3 V to 1500V. ---------------------------------------------------------------------------- 1030515010 hutch PHYSICS_OPERATOR May 15 2003 11:24:32:383AM . . . . . . . . . . . . . . . . . . . . Fizzle. Looks as if the first positive swing on Bz is caused by the EF2 early swing. The negative swing is caused by the OH1 finally turning on hard at about 7ms. Lower EF2V point at -10ms. Raise EF3V to 1600V at 8-12ms. Lower it to 1300V at 20ms. ---------------------------------------------------------------------------- 1030515011 hutch PHYSICS_OPERATOR May 15 2003 11:38:58:343AM . . . . . . . . . . . . . . . . . . . . Fizzle. Sightly less current. Still not keeping up with OH1. The EF2 change seemed significant. Adjustments: Lower OH1V back to 600V to avoid overdrive. Make OH2V 120V at 0ms to increase the impulse EF3V to 1000V at 1ms. ---------------------------------------------------------------------------- 1030515012 hutch PHYSICS_OPERATOR May 15 2003 11:55:45:946AM . . . . . . . . . . . . . . . . . . . . No light. Adjustments: OH2V to 100V at 10ms to remove swing back. EF2V to -100V from +200V at -5ms. ---------------------------------------------------------------------------- 1030515013 hutch PHYSICS_OPERATOR May 15 2003 12:20:31:453PM . . . . . . . . . . . . . . . . . . . . Plasma till about 60ms 173kA max. Dies because of position uncontrol. Adjustments: EF2s to -100V at -1ms. OH2V to 100V at 30ms from 0V. ---------------------------------------------------------------------------- 1030515014 hutch PHYSICS_OPERATOR May 15 2003 12:44:57:053PM . . . . . . . . . . . . . . . . . . . . Plasma till 2s. At .1s we get 350kA. Seems like a well controlled shot. Adjustment: Br offset to 1mT from 1.5mT ---------------------------------------------------------------------------- 1030515015 hutch PHYSICS_OPERATOR May 15 2003 12:56:45:806PM . . . . . . . . . . . . . . . . . . . . Fizzle. Slightly later breakdown. Fill was .06: slightly higher. Br offset to 2mT. ---------------------------------------------------------------------------- 1030515016 hutch PHYSICS_OPERATOR May 15 2003 1:10:31:640PM . . . . . . . . . . . . . . . . . . . . No light. Br back to 1.5mT offset EF1current to -6200 from 6000 (demand) at 0s. ---------------------------------------------------------------------------- 1030515017 hutch PHYSICS_OPERATOR May 15 2003 1:23:17:113PM . . . . . . . . . . . . . . . . . . . . Fizzle. No current very weak light. mflux shows I went the wrong way on the EF1 current. Yes, on second thoughts I did. Adjustments: EF2current to -5800 ---------------------------------------------------------------------------- 1030515018 hutch PHYSICS_OPERATOR May 15 2003 1:36:16:490PM . . . . . . . . . . . . . . . . . . . . No light. EF4 current to -1350 from -1320A. ---------------------------------------------------------------------------- 1030515019 hutch PHYSICS_OPERATOR May 15 2003 1:48:59:560PM . . . . . . . . . . . . . . . . . . . . No light. The field null looks fabulous. Add voltage to EF3 from 3ms to 12ms. ---------------------------------------------------------------------------- 1030515020 hutch PHYSICS_OPERATOR May 15 2003 2:03:00:800PM . . . . . . . . . . . . . . . . . . . . No light. Reload shot 14. ---------------------------------------------------------------------------- 1030515021 hutch PHYSICS_OPERATOR May 15 2003 2:14:52:566PM . . . . . . . . . . . . . . . . . . . . No light. This seems to show that my duds were not caused by fields. We seem to be getting a field configuration almost identical to the shot 14 fields. Fill puff to 17ms from 20. ---------------------------------------------------------------------------- 1030515022 hutch PHYSICS_OPERATOR May 15 2003 2:27:59:710PM . . . . . . . . . . . . . . . . . . . . Plasma. lost ratiomatic data. Load shot 19. EF4 current to -1330A ---------------------------------------------------------------------------- 1030515023 hutch PHYSICS_OPERATOR May 15 2003 2:41:58:890PM . . . . . . . . . . . . . . . . . . . . Fizzle. About 10kA of current. This is the wider null case. This shows that my previous duds were not really a function of gas or anything obvious. Pressure .061mtorr. EF4 current to -1340A EF3 voltage increase at 8ms. ---------------------------------------------------------------------------- 1030515024 hutch PHYSICS_OPERATOR May 15 2003 3:04:13:580PM . . . . . . . . . . . . . . . . . . . . Fizzle, Breakdown about 15ms. 10kA only. Bz +2mT. Fill .059mtorr. EF4 current to -1355 from -1340A. ---------------------------------------------------------------------------- 1030515025 hutch PHYSICS_OPERATOR May 15 2003 3:06:10:863PM . . . . . . . . . . . . . . . . . . . . Dud. Bz =-.5mT EF4 current -1345A. ---------------------------------------------------------------------------- 1030515026 hutch PHYSICS_OPERATOR May 15 2003 3:19:32:323PM . . . . . . . . . . . . . . . . . . . . Dud. Fill puff to 17ms. ---------------------------------------------------------------------------- 1030515027 hutch PHYSICS_OPERATOR May 15 2003 3:32:33:700PM . . . . . . . . . . . . . . . . . . . . Dud. Pressure .047mtorr. Fill puff to 25ms. ---------------------------------------------------------------------------- 1030515028 hutch PHYSICS_OPERATOR May 15 2003 3:45:55:863PM . . . . . . . . . . . . . . . . . . . . Dud Load shot 20. EF4 current to -1365A. ---------------------------------------------------------------------------- 1030515029 hutch PHYSICS_OPERATOR May 15 2003 3:59:59:806PM . . . . . . . . . . . . . . . . . . . . Dud. Ef4 to -1375 ---------------------------------------------------------------------------- 1030515030 hutch PHYSICS_OPERATOR May 15 2003 4:14:12:563PM . . . . . . . . . . . . . . . . . . . . Dud. Load from shot 22. ---------------------------------------------------------------------------- 1030515031 hutch PHYSICS_OPERATOR May 15 2003 4:25:39:236PM . . . . . . . . . . . . . . . . . . . . Dud. Fill puff to 22ms. ---------------------------------------------------------------------------- 1030515032 hutch PHYSICS_OPERATOR May 15 2003 4:41:38:090PM . . . . . . . . . . . . . . . . . . . . Dud. Do ecdc for 5 minutes. Fill puff to 20ms. ---------------------------------------------------------------------------- 1030515033 hutch PHYSICS_OPERATOR May 15 2003 4:56:47:800PM . . . . . . . . . . . . . . . . . . . . Fizzle. 7kA. Bdwn at about 13ms. No changes. ---------------------------------------------------------------------------- 1030515034 hutch PHYSICS_OPERATOR May 15 2003 4:57:09:300PM . . . . . . . . . . . . . . . . . . . . Dud. |
| Session Leader Comments |
| Physics Operator Comments | |||
| May 15 2003 08:56:02:640AM | Ian Hutchinson | Load from 10314002 for first shot. Set density feedback gain to zero. Load clean | |
| May 15 2003 09:15:51:670AM | 1030515003 | Ian Hutchinson | Plasma. First plasma shot attempt. Full length. Under preprogrammed gas puff. Now we switch off commutation and adjust the voltages. Draw OH1 to +600V. OH2 to +150V EF1 to +400V Each are symmetrically copied into the upper and lower. Draw EF3 Voltage to +1300V. Load |
| May 15 2003 09:43:37:697AM | 1030515004 | Ian Hutchinson | Got a minor flash at 16ms. Fields show a slowly increasing Br as desired, but a strong curvature, not desired. I had forgotten to lower the pressure. We get about .08 mtorr. Got a loop voltage of about 5.5V but it ramps up during the first 10 ms. Got 600 V out of OH1, 190V OH2U, 230V OH2L. 400V EF2s. There is a problem with the OH2s going in different directions later in the shot we probably need to bring the fizzle detector earlier. Adjustments: Fizzle detector OHs to 300ms. OH1 to 700V OH2s to 135V Pulse Gas 4 fill puff to 18ms from 27ms. Br offset to 1.5mT from 0.5mT. |
| May 15 2003 10:04:51:400AM | 1030515005 | Ian Hutchinson | No light. OH1V got 600V. Still got over 200V on OH2. Seems not to follow demand. Perhaps an integral feedback issue. No ratiomatic data. Adjustments: Fill puff to 20ms. Round out the rise of OH2s to prevent saturation. EF3 V to 1100V. |
| May 15 2003 10:18:49:237AM | 1030515006 | Ian Hutchinson | No light. Got .057mtorr. OH2 adjustment was in the right direction but not enough. Adjustments: OH2 ramp even slower to prevent saturation. EF3 voltage to 900V in first 5ms. |
| May 15 2003 10:34:26:540AM | 1030515007 | Ian Hutchinson | Fizzle. Very late breakdown 20ms but lasts till 45ms. Bz swings quickly positive and then back down. It seems that the breakdown occurs on the second minimum. Adjustments: Drop the OH2 early points some more. EF3 first point made into a slow ramp. |
| May 15 2003 10:49:55:093AM | 1030515008 | Ian Hutchinson | Fizzle. Bdown at 10ms. 15kA current. This is very promising but the current can't get going because the Bz is still swinging back negative at the time the plasma is starting. EF3 voltage to 1200 at 6ms. Try to remove the Bz dip. |
| May 15 2003 11:07:33:873AM | 1030515009 | Ian Hutchinson | Fizzle. Almost identical 15kA, slightly faster Halpha rise. EF3 V to 1500V. |
| May 15 2003 11:24:32:383AM | 1030515010 | Ian Hutchinson | Fizzle. Looks as if the first positive swing on Bz is caused by the EF2 early swing. The negative swing is caused by the OH1 finally turning on hard at about 7ms. Lower EF2V point at -10ms. Raise EF3V to 1600V at 8-12ms. Lower it to 1300V at 20ms. |
| May 15 2003 11:38:58:343AM | 1030515011 | Ian Hutchinson | Fizzle. Sightly less current. Still not keeping up with OH1. The EF2 change seemed significant. Adjustments: Lower OH1V back to 600V to avoid overdrive. Make OH2V 120V at 0ms to increase the impulse EF3V to 1000V at 1ms. |
| May 15 2003 11:55:45:947AM | 1030515012 | Ian Hutchinson | No light. Adjustments: OH2V to 100V at 10ms to remove swing back. EF2V to -100V from +200V at -5ms. |
| May 15 2003 12:20:31:453PM | 1030515013 | Ian Hutchinson | Plasma till about 60ms 173kA max. Dies because of position uncontrol. Adjustments: EF2s to -100V at -1ms. OH2V to 100V at 30ms from 0V. |
| May 15 2003 12:44:57:053PM | 1030515014 | Ian Hutchinson | Plasma till 2s. At .1s we get 350kA. Seems like a well controlled shot. Adjustment: Br offset to 1mT from 1.5mT |
| May 15 2003 12:56:45:807PM | 1030515015 | Ian Hutchinson | Fizzle. Slightly later breakdown. Fill was .06: slightly higher. Br offset to 2mT. |
| May 15 2003 01:10:31:640PM | 1030515016 | Ian Hutchinson | No light. Br back to 1.5mT offset EF1current to -6200 from 6000 (demand) at 0s. |
| May 15 2003 01:23:17:113PM | 1030515017 | Ian Hutchinson | Fizzle. No current very weak light. mflux shows I went the wrong way on the EF1 current. Yes, on second thoughts I did. Adjustments: EF2current to -5800 |
| May 15 2003 01:36:16:490PM | 1030515018 | Ian Hutchinson | No light. EF4 current to -1350 from -1320A. |
| May 15 2003 01:48:59:560PM | 1030515019 | Ian Hutchinson | No light. The field null looks fabulous. Add voltage to EF3 from 3ms to 12ms. |
| May 15 2003 02:03:00:800PM | 1030515020 | Ian Hutchinson | No light. Reload shot 14. |
| May 15 2003 02:14:52:567PM | 1030515021 | Ian Hutchinson | No light. This seems to show that my duds were not caused by fields. We seem to be getting a field configuration almost identical to the shot 14 fields. Fill puff to 17ms from 20. |
| May 15 2003 02:27:59:710PM | 1030515022 | Ian Hutchinson | Plasma. lost ratiomatic data. Load shot 19. EF4 current to -1330A |
| May 15 2003 02:41:58:890PM | 1030515023 | Ian Hutchinson | Fizzle. About 10kA of current. This is the wider null case. This shows that my previous duds were not really a function of gas or anything obvious. Pressure .061mtorr. EF4 current to -1340A EF3 voltage increase at 8ms. |
| May 15 2003 03:04:13:580PM | 1030515024 | Ian Hutchinson | Fizzle, Breakdown about 15ms. 10kA only. Bz +2mT. Fill .059mtorr. EF4 current to -1355 from -1340A. |
| May 15 2003 03:06:10:863PM | 1030515025 | Ian Hutchinson | Dud. Bz =-.5mT EF4 current -1345A. |
| May 15 2003 03:19:32:323PM | 1030515026 | Ian Hutchinson | Dud. Fill puff to 17ms. |
| May 15 2003 03:32:33:700PM | 1030515027 | Ian Hutchinson | Dud. Pressure .047mtorr. Fill puff to 25ms. |
| May 15 2003 03:45:55:863PM | 1030515028 | Ian Hutchinson | Dud Load shot 20. EF4 current to -1365A. |
| May 15 2003 03:59:59:807PM | 1030515029 | Ian Hutchinson | Dud. Ef4 to -1375 |
| May 15 2003 04:14:12:563PM | 1030515030 | Ian Hutchinson | Dud. Load from shot 22. |
| May 15 2003 04:25:39:237PM | 1030515031 | Ian Hutchinson | Dud. Fill puff to 22ms. |
| May 15 2003 04:41:38:090PM | 1030515032 | Ian Hutchinson | Dud. Do ecdc for 5 minutes. Fill puff to 20ms. |
| May 15 2003 04:56:47:800PM | 1030515033 | Ian Hutchinson | Fizzle. 7kA. Bdwn at about 13ms. No changes. |
| May 15 2003 04:57:09:300PM | 1030515034 | Ian Hutchinson | Dud. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:04:38:187AM | Test | Ok | Cycle Test |
| 2 | 08:14:27:920AM | Test | Ok | Cycle Test |
| 3 | 09:03:51:840AM | Plasma | Ok | |
| 4 | 09:17:11:190AM | Plasma | Ok | |
| 5 | 09:41:20:647AM | Plasma | Ok | |
| 6 | 10:02:39:820AM | Plasma | Ok | |
| 7 | 10:16:58:123AM | Plasma | Ok | |
| 8 | 10:32:24:867AM | Plasma | Ok | |
| 9 | 10:47:41:810AM | Plasma | Ok | |
| 10 | 11:05:33:353AM | Plasma | Ok | |
| 11 | 11:23:26:787AM | Plasma | Ok | |
| 12 | 11:37:00:560AM | Plasma | Ok | |
| 13 | 11:53:41:583AM | Plasma | Ok | |
| 14 | 12:18:16:420PM | Plasma | Ok | |
| 15 | 12:41:43:813PM | Plasma | Ok | |
| 16 | 12:54:37:427PM | Plasma | Ok | |
| 17 | 01:08:34:387PM | Plasma | Ok | |
| 18 | 01:21:27:030PM | Plasma | Ok | |
| 19 | 01:34:17:600PM | Plasma | Ok | |
| 20 | 01:47:02:477PM | Plasma | Ok | |
| 21 | 01:59:41:560PM | Plasma | Ok | |
| 22 | 02:12:52:360PM | Plasma | Ok | |
| 23 | 02:26:05:617PM | Plasma | Ok | |
| 24 | 02:38:40:760PM | Plasma | Ok | |
| 25 | 02:51:19:140PM | Plasma | Ok | |
| 26 | 03:04:27:860PM | Plasma | Ok | |
| 27 | 03:17:30:350PM | Plasma | Ok | |
| 28 | 03:30:40:933PM | Plasma | Ok | |
| 29 | 03:43:29:640PM | Plasma | Ok | |
| 30 | 03:56:20:803PM | Plasma | Ok | |
| 31 | 04:11:05:010PM | Plasma | Ok | |
| 32 | 04:23:43:220PM | Plasma | Ok | |
| 33 | 04:42:10:560PM | Plasma | Ok | |
| 34 | 04:54:44:500PM | Plasma | Ok | |