| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Unknown |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| Plasma Startup and Conditioning |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:19:397PM |
| Author: Joseph Snipes |
| Engineering setup for Tuesday, 21 Oct 2003 Purpose: Plasma startup and conditioning Session leader: -- Physics operator: J. Snipes Engineering operator: 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 1031016029 (0.8 MA, 5.4 T, lower single null) Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: Transmitters 1, 2, 3 and 4 in RUN ON by 08:00 am ------------------------------------------------------------------------------- Run Plan: We'll continue running cleanup plasmas while monitoring H/D, etc. RF Group will condition J, D & E at 78 MHz, 80 and 80.5 MHz. Summary: The run went pretty well up to shot 14. The first shot was a test of the A-coil supply and the shots after 14 were more A-coil test shots. Shot 2 disrupted at 0.6 s following a large injection. Then, after a few minutes ECDC, the plasmas ran full length until shot 13 which fizzled. Shot 14 was also a full length plasma after a few minutes of ECDC, though the density increased too rapidly particularly after the NINJA injected still more than the programmed gas. After shot 14, it was decided to cancel the run because the helium purity in the alternator dropped below 84% indicating a problem with the alternator. Work will resume on the alternator today and we will hopefully run tomorrow. Scorecard up to shot 14: 1 test 1 fizzle 12 plasmas Shot 1: Started with what was in the model from 1031017032, which was a lower single null plasma. Modified the A-coil waveform to start at 0.25 s ramp up to 3000 A at 0.5 s then ramp down at 1 s to zero at 1.25 s for tests of the A-coil supply. No plasma A-coil test. A-coil still has a large offset and the current is down by a factor of two over the request. Shot 2: Started with 20 min of ECDC in D2 to recover from RF conditioning before the run while work was being done on the A-coil supply. Alternator heater trip made the alternator slow down just before the shot causing a small delay while it spins up to speed again. Plasma shot disrupted at 0.605 s. Big injection at 0.56 s. NINJA set to 90 psi of He. Shot 3: 5 min ECDC after the disruption. Good shot. Shot 4: Repeat. Good shot. Got a brief H-mode from 0.87 - 0.94 s with 1.5 MW of RF. Shot 5: Repeat. NINJA He puff around 1 s. Good shot disrupted at 1.58 s. H/H+D ~ 0.09. Shot 6: Repeat. Good shot. Brief H-mode from 0.78 - 0.85 s. Shot 7: Reduce nl04 to 0.8 x 10^20 m^-2 at Bruce's request. Good shot. Did not get the requested density though. Shot 8: Try reducing the density to 0.7 x 10^20 m^-2. Reduce NINJA to 45 psi of He. Good shot. No H-mode despite 2.2 MW of RF. Shot 9: Repeat. Good shot. H/(H+D) ~ 0.12. No H-mode. Shot 10: Repeat. Good shot. Shot 11: Return to nl04 = 1 x 10^20 m^-2. Good shot. Got the H-mode back with 2.5 MW of RF. Shot 12: IGOR hold up before this shot. Raised nl04 to 1.2 x 10^20 m^-2 Good shot. No H-mode. Shot 13: Raised nl04 to 1.4 x 10^20 m^-2. Fizzle! Shot 14: ECDC for 8 min. Then repeat. Good shot but the density behaved badly for some reason and so did the plasma current. Apparently, I asked the density to rise too quickly, but then it kept going beyond the request. Alternator problems after the shot will cause a delay so we will run A-coil test shots in the meantime. |
| Session Leader Comments |
| Physics Operator Comments | |||
| Oct 21 2003 11:58:01:780AM | Joseph Snipes | Engineering setup for Tuesday, 21 Oct 2003 Purpose: Plasma startup and conditioning Session leader: -- Physics operator: J. Snipes Engineering operator: 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 1031016029 (0.8 MA, 5.4 T, lower single null) Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: Transmitters 1, 2, 3 and 4 in RUN ON by 08:00 am ------------------------------------------------------------------------------- Run Plan: We'll continue running cleanup plasmas while monitoring H/D, etc. RF Group will condition J, D & E at 78 MHz, 80 and 80.5 MHz. | |
| Oct 21 2003 11:58:32:047AM | 1031021001 | Joseph Snipes | Shot 1: Started with what was in the model from 1031017032, which was a lower single null plasma. Modified the A-coil waveform to start at 0.25 s ramp up to 3000 A at 0.5 s then ramp down at 1 s to zero at 1.25 s for tests of the A-coil supply. No plasma A-coil test. A-coil still has a large offset and the current is down by a factor of two over the request. |
| Oct 21 2003 11:58:52:530AM | 1031021002 | Joseph Snipes | Shot 2: Started with 20 min of ECDC in D2 to recover from RF conditioning before the run while work was being done on the A-coil supply. Alternator heater trip made the alternator slow down just before the shot causing a small delay while it spins up to speed again. Plasma shot disrupted at 0.605 s. Big injection at 0.56 s. NINJA set to 90 psi of He. |
| Oct 21 2003 11:59:03:920AM | 1031021003 | Joseph Snipes | Shot 3: 5 min ECDC after the disruption. Good shot. |
| Oct 21 2003 11:59:18:110AM | 1031021004 | Joseph Snipes | Shot 4: Repeat. Good shot. Got a brief H-mode from 0.87 - 0.94 s with 1.5 MW of RF. |
| Oct 21 2003 11:59:29:703AM | 1031021005 | Joseph Snipes | Shot 5: Repeat. NINJA He puff around 1 s. Good shot disrupted at 1.58 s. H/H+D ~ 0.09. |
| Oct 21 2003 11:59:47:937AM | 1031021006 | Joseph Snipes | Shot 6: Repeat. Good shot. Brief H-mode from 0.78 - 0.85 s. |
| Oct 21 2003 12:00:04:907PM | 1031021007 | Joseph Snipes | Shot 7: Reduce nl04 to 0.8 x 10^20 m^-2 at Bruce's request. Good shot. Did not get the requested density though. |
| Oct 21 2003 12:00:16:077PM | 1031021008 | Joseph Snipes | Shot 8: Try reducing the density to 0.7 x 10^20 m^-2. Reduce NINJA to 45 psi of He. Good shot. No H-mode despite 2.2 MW of RF. |
| Oct 21 2003 12:00:29:640PM | 1031021009 | Joseph Snipes | Shot 9: Repeat. Good shot. H/(H+D) ~ 0.12. No H-mode. |
| Oct 21 2003 12:00:43:423PM | 1031021010 | Joseph Snipes | Shot 10: Repeat. Good shot. |
| Oct 21 2003 12:16:51:577PM | 1031021011 | Joseph Snipes | Shot 11: Return to nl04 = 1 x 10^20 m^-2. Good shot. Got the H-mode back with 2.5 MW of RF. |
| Oct 21 2003 12:54:02:157PM | 1031021012 | Joseph Snipes | Shot 12: IGOR hold up before this shot. Raised nl04 to 1.2 x 10^20 m^-2. Good shot. No H-mode. |
| Oct 21 2003 12:59:04:687PM | 1031021013 | Joseph Snipes | Shot 13: Raised nl04 to 1.4 x 10^20 m^-2. Fizzle! |
| Oct 21 2003 01:30:31:093PM | 1031021014 | Joseph Snipes | Shot 14: ECDC for 8 min. Then repeat. Good shot but the density behaved badly for some reason and so did the plasma current. Apparently, I asked the density to rise too quickly, but then it kept going beyond the request. Alternator problems after the shot will cause a delay so we will run A-coil test shots in the meantime. |
| Oct 21 2003 02:48:43:780PM | 1031021014 | Joseph Snipes | Summary: The run went pretty well up to shot 14. The first shot was a test of the A-coil supply and the shots after 14 were more A-coil test shots. Shot 2 disrupted at 0.6 s following a large injection. Then, after a few minutes ECDC, the plasmas ran full length until shot 13 which fizzled. Shot 14 was also a full length plasma after a few minutes of ECDC, though the density increased too rapidly particularly after the NINJA injected still more than the programmed gas. After shot 14, it was decided to cancel the run because the helium purity in the alternator dropped below 84% indicating a problem with the alternator. Work will resume on the alternator today and we will hopefully run tomorrow. Scorecard up to shot 14: 1 test 1 fizzle 12 plasmas |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:43:44:340AM | Test | Ok | Correction Coil Test |
| 2 | 09:34:48:360AM | Plasma | Ok | |
| 3 | 09:57:41:610AM | Plasma | Ok | |
| 4 | 10:11:13:030AM | Plasma | Ok | |
| 5 | 10:24:56:877AM | Plasma | Ok | |
| 6 | 10:40:59:687AM | Plasma | Ok | |
| 7 | 10:56:22:720AM | Plasma | Ok | |
| 8 | 11:16:08:123AM | Plasma | Ok | |
| 9 | 11:31:13:763AM | Plasma | Ok | |
| 10 | 11:51:24:437AM | Plasma | Ok | |
| 11 | 12:04:38:890PM | Plasma | Ok | |
| 12 | 12:42:00:470PM | Plasma | Ok | |
| 13 | 12:55:28:610PM | Plasma | Ok | |
| 14 | 01:19:37:310PM | Plasma | Ok | |
| 15 | 01:45:37:157PM | Test | Ok | CC_M-S test |
| 16 | 02:12:43:170PM | Test | Ok | |
| 17 | 02:42:54:000PM | Test | Ok | |
| 18 | 03:09:58:330PM | Test | Ok | |
| 19 | 03:35:58:013PM | Test | Ok | |
| 20 | 03:46:20:580PM | Test | Ok | |
| 21 | 04:11:27:877PM | Test | Ok | |
| 22 | 04:22:46:983PM | Test | Ok | |