| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Steve Wukitch |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Bill Cochran,Bill Byford,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP#355 |
| Session Leader Plans |
| Entered: Feb 18 2005 11:36:58:870AM |
| Author: Steve Wukitch |
| Plan: We will continue the simple and dull plasma operation for antenna conditioning . We want to obtain as many discharges as possible to plasma condition D and E antennas. Start with vanilla LSN, 5.4 T, Ip=0.8 MA, nl_04=0.6 target discharge (1050216007). Upper null discharges can be run if parties are interested (1050216013 is a good starting point). The aim is to get 1 MW from each for 0.5 sec then combine and maximize injected power. Monitor density and impurity evolution for trends with RF power. |
| Physics Operators Plans |
| Entered: Feb 17 2005 01:55:45:690PM |
| Author: Joseph Snipes |
| MP#355: SL: Wukitch PO: Snipes Overnight ECDC in D2, bake at 60C Engineering setup: Power systems as on 1050215007 Gas setup: ----------- > fill B-Top with 6 psi D2 Hybrid Enabled (PG4) > fill B-side lower with 1 psi Ar Hybrid DISabled (PG1) > fill B-side upper with 30 psi D2 Hybrid DISabled (PG2) > fill (former) C-side with 30 psi D2 Hybrid Enabled (PG3) Torvac Setup: -------------- GV1 closed, Bypass to RGA open Torus gate valves closed in Pulse for 5min after shot Gate valves: ECE (assuming no vac problems) and Z-bolo/shutter open --------------------------------------------------------- Plan: We will continue the simple and dull plasma operation for antenna conditioning . We want to obtain as many discharges as possible to plasma condition D and E antennas. Start with vanilla LSN, 5.4 T, Ip=0.8 MA, nl_04=0.6 target discharge (1050216007). Upper null discharges can be run if parties are interested (1050216013 is a good starting point). The aim is to get 1 MW from each for 0.5 sec then combine and maximize injected power. Monitor density and impurity evolution for trends with RF power. --------------------------------------------------------- |
| Session Leader Summaries |
| Entered: Feb 18 2005 07:03:24:103PM |
| Author: Steve Wukitch |
| E antenna plasma conditioning has progressed well. To increase power further, FMIT#2 tuning needs to be improved at high power. The plate impedance is too high to allow operation into plasma above 1.2 MW. Initial plasma conditioning was attempted on D antenna. During vacuum conditioning, Dave Johnson was in the cell when we were testing and clearly heard ticking. We will pumped for an hour and back fill with SF6 at 10 psi the stub tuner-phase shifter section. After pumping and back filling with SF6, the matched line appeared to have an arc between the switch and DC1. We need to pump and purge this line before continuing with antenna operation. There may have been arcing activities on D antenna as seen from camera wide 2 view on shot 018. The cause is unclear though. |
| Physics Operator Summaries |
| Entered: Feb 18 2005 07:03:55:590PM |
| Author: Joseph Snipes |
| Overall, it was a successful run. The machine ran rather well. There were 21 plasmas of which 20 were full length. The density feedback was failing by the end of the day, but did not do anything disasterous. See the session leader summary for the RF performance. It seems that D was arcing, but E worked reasonably well. Still, the H concentration was rather high except for shot 1. The walls need further conditioning. Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax 1 1.975 0.832 2 1.832 0.828 3 0.621 0.752 4 0.000 0.037 5 1.690 0.810 6 1.698 0.811 7 0.000 0.022 8 1.972 0.830 9 1.970 0.832 10 1.836 0.826 11 1.737 0.824 12 1.808 0.821 13 0.000 0.041 14 1.845 0.830 15 1.898 0.828 16 0.000 0.042 17 0.000 0.036 18 1.881 0.827 19 1.881 0.826 20 1.897 0.824 21 1.911 0.828 22 1.910 0.827 23 0.000 0.048 24 1.938 0.824 25 1.911 0.822 26 1.885 0.821 27 1.888 0.822 Finished summary for 1050218 Total of 27 shots. 27 shots. 21 plasmas. 5 fizzles. 1 duds. |
| Session Leader Comments | |||
| Feb 18 2005 12:13:23:323PM | 1050218001 | Steve Wukitch | 001 BT~5.4T, Ip~0.8 MA, nl06~0.6 E: 1.0 MW [0.6,1.5]sec result: plasma E: ran 1 fault no D antenna until we can isolate a breakdown problem (in the lines hopefully) |
| Feb 18 2005 12:57:39:370PM | 1050218002 | Steve Wukitch | 002 BT~5.4T, Ip~0.8 MA, nl06~0.8 E: 1.0 MW [0.6,1.5]sec result: plasma E: ran 1 fault |
| Feb 18 2005 01:21:16:073PM | 1050218003 | Steve Wukitch | 003 BT~5.4T, Ip~0.8 MA, nl06~0.8 E: 1.2 MW [0.6,1.5]sec result: plasma - early disruption |
| Feb 18 2005 01:21:59:120PM | 1050218004 | Steve Wukitch | 004 BT~5.4T, Ip~0.8 MA, nl06~0.8 E: 1.2 MW [0.6,1.5]sec result: NTP |
| Feb 18 2005 01:38:38:760PM | 1050218005 | Steve Wukitch | 005 BT~5.4T, Ip~0.8 MA, nl06~0.8 E: 1.2 MW [0.6,1.5]sec result: plasma E: ran 5 faults FMIT#2 FPA is overdriven at high power. We need to improve the high power match next week. |
| Feb 18 2005 02:46:39:900PM | 1050218006 | Steve Wukitch | 006 BT~5.4T, Ip~0.8 MA, nl06~0.6 E: 1.2 MW [0.6,1.5]sec result: plasma E: ran 5 faults |
| Feb 18 2005 02:48:04:040PM | 1050218007 | Steve Wukitch | 007 test |
| Feb 18 2005 02:48:41:557PM | 1050218008 | Steve Wukitch | 008 BT~5.4T, Ip~0.8 MA, nl06~0. E: 1.0 MW [0.6,1.5]sec result: plasma E: ran 1 fault |
| Feb 18 2005 02:52:50:197PM | 1050218009 | Steve Wukitch | 009 BT~5.4T, Ip~0.8 MA, nl06~0. E: 1.0 MW [0.6,1.5]sec result: plasma E: ran 1 fault D antenna appears to have a breakdown in the matched section of line now. We filled the tuner with SF6 and it appears to be working better than the matched side now. |
| Feb 18 2005 03:22:50:370PM | 1050218010 | Steve Wukitch | 010 BT~5.4T, Ip~0.8 MA, nl06~0. E: 1.0 MW [0.6,1.5]sec result: plasma E: ran 1 fault Ran D into dummy load to test if the switch is failing. |
| Feb 18 2005 03:24:31:730PM | 1050218011 | Steve Wukitch | 011 BT~5.4T, Ip~0.8 MA, nl06~0. D: .15 MW [0.6,1.5]sec E: 1.0 MW [0.8,1.5]sec result: plasma D: max faults (but improved over previous) E: ran 4 faults |
| Feb 18 2005 03:26:45:277PM | 1050218012 | Steve Wukitch | 012 BT~5.4T, Ip~0.8 MA, nl06~0.8 D: .15 MW [0.6,1.5]sec E: 1.0 MW [0.8,1.5]sec result: plasma D: max faults (but improved) E: ran 3 faults |
| Feb 18 2005 04:20:18:353PM | 1050218013 | Steve Wukitch | 013 BT~5.4T, Ip~0.8 MA, nl06~0.8 D: .15 MW [0.6,1.5]sec E: 1.0 MW [0.8,1.5]sec result: fizzle |
| Feb 18 2005 04:20:38:557PM | 1050218014 | Steve Wukitch | 014 BT~5.4T, Ip~0.8 MA, nl06~0.8 D: .15 MW [0.6,1.5]sec E: 1.0 MW [0.8,1.5]sec result: D: max faults (but improved) E: ran 4 faults |
| Feb 18 2005 04:20:48:557PM | 1050218015 | Steve Wukitch | 015 BT~5.4T, Ip~0.8 MA, nl06~0.8 D: .15 MW [0.6,1.5]sec E: 1.0 MW [0.9,1.5]sec result: D: max faults (but improved) E: ran 4 faults |
| Feb 18 2005 04:21:16:540PM | 1050218016 | Steve Wukitch | 016 BT~5.4T, Ip~0.8 MA, nl06~0.8 D: .15 MW [0.6,1.5]sec E: 1.0 MW [0.9,1.5]sec result: fizzle |
| Feb 18 2005 04:30:39:887PM | 1050218017 | Steve Wukitch | 017 BT~5.4T, Ip~0.8 MA, nl06~0.8 D: .15 MW [0.6,1.5]sec E: 1.0 MW [0.9,1.5]sec result: dud |
| Feb 18 2005 05:00:15:387PM | 1050218018 | Steve Wukitch | 018 BT~5.4T, Ip~0.8 MA, nl06~0.8 D: .15 MW [0.6,1.5]sec E: 1.0 MW [0.9,1.5]sec result: plasma D: max faults (improved?) E: ran 2 faults Camera wide-2 view showed some arcing activities on the top left corner (C-side) of the D antenna between t = 1-1.2 sec. The D port power was small in this time period. The plasma was affected somewhat (seen on 2pi, and nl04). |
| Feb 18 2005 05:07:45:887PM | 1050218019 | Steve Wukitch | 019 BT~5.4T, Ip~0.8 MA, nl06~0.8 D: .15 MW [0.6,1.5]sec E: 1.0 MW [0.9,1.5]sec result: plasma D: max faults (worse) E: clean. No more arcing seen on the camera. But D port is still sick. I may decide whether to stop running D after a couple more shots. |
| Feb 18 2005 05:23:36:993PM | 1050218020 | Steve Wukitch | 020 BT~5.4T, Ip~0.8 MA, nl06~0.8 D: .15 MW [0.6,1.5]sec E: 1.0 MW [0.9,1.5]sec result: plasma D: max faults (going nowhere E: clean. The faults in D are all DC0 arcing as reported by computer. Next get fast data in the cell to check more carefully. If it is the case, I should stop running D. |
| Feb 18 2005 05:38:13:743PM | 1050218021 | Steve Wukitch | 021 BT~5.4T, Ip~0.8 MA, nl06~0.8 D: .15 MW [0.6,1.5]sec E: 1.0 MW [0.9,1.5]sec result: plasma D: max faults E: clean Fast data from cell. At D port faults, there are clearly DC0 refl spikes. Smaller spikes are also seen in some DC1 refl signals. Next, return to slow data. Redude D port power demand to 0.13 and see whether it can run longer. |
| Feb 18 2005 05:48:32:760PM | 1050218022 | Steve Wukitch | 022 BT~5.4T, Ip~0.8 MA, nl06~0.8 D: .13 MW [0.6,1.0]sec E: 1.0 MW [0.9,1.5]sec result: plasma D: max faults (Not better) E: 1 fault. Since D port does not get any better, I will not run it any more today. |
| Feb 18 2005 06:19:38:430PM | 1050218023 | Steve Wukitch | 023 BT~5.4T, Ip~0.8 MA, nl06~0.8 D: .13 MW [0.6,1.0]sec E: 1.0 MW [0.9,1.5]sec result: fizzle |
| Feb 18 2005 06:21:06:917PM | 1050218024 | Steve Wukitch | 024 BT~5.4T, Ip~0.8 MA, nl06~0.8 E: 1.0 MW [0.7,1.5]sec result: E clean. Next, slightly increase E power. |
| Feb 18 2005 06:41:16:510PM | 1050218025 | Steve Wukitch | 025 BT~5.4T, Ip~0.8 MA, nl06~0.8 E: 1.1 MW [0.7,1.5]sec result: E: 2 faults. Next: raise E power again. |
| Feb 18 2005 06:52:04:993PM | 1050218026 | Steve Wukitch | 026 BT~5.4T, Ip~0.8 MA, nl06~0.8 E: 1.2 MW [0.7,1.5]sec result: E: 3 faults. FPA screen current rose too much at the end of the pulse. Clearly, the transmitter needs more tuning for higher power. Next: reduce power to 1.0 MW level. |
| Feb 18 2005 07:02:39:900PM | 1050218027 | Steve Wukitch | 027 BT~5.4T, Ip~0.8 MA, nl06~0.8 E: 1.0 MW [0.7,1.5]sec result: E: clean |
| Physics Operator Comments | |||
| Feb 18 2005 12:10:55:400PM | 1050218001 | Joseph Snipes | Shot 1: Copied shot 1050216007 and increased B-side lower Ar gas pressure to 2 psi at Rice's request. Good shot. |
| Feb 18 2005 12:47:27:603PM | 1050218002 | Joseph Snipes | Shot 2: Raised nl04 to 8 x 10^19 m^-2. Problems with the Sherman computer of Jim Terry's slowing down the acquisition from Shot 1. Tom turned off all actions to Sherman to keep it out of the shot cycle. Cell access for Wukith, then we are once again ready for the shot. Good shot. |
| Feb 18 2005 01:10:47:180PM | 1050218003 | Joseph Snipes | Shot 3: Repeat. Disrupted at 0.62 s. Density increases too much early. Perhaps, there are some impurities coming into the plasma. |
| Feb 18 2005 01:18:54:557PM | 1050218004 | Joseph Snipes | Shot 4: Reduced nl04 to 5 x 10^19 m^-2 again to see if that helps. Turned off NINJA puff, which was on for some reason, though it is not clear if it was puffing. Fizzle! |
| Feb 18 2005 01:42:15:010PM | 1050218005 | Joseph Snipes | Shot 5: Both Br and Bz changed a lot after that disruption. If these changes are real, I need to compensate. So, I've dropped Br0 by 0.5 mT to -0.003 and I've lowered EF4 from -1340 A to -1380 A. Just barely got the current rise, but it did go. Disrupted in rampdown at 1.69 s. Lots of runaways from early on. Huge offset changes in flux loop F15. Granetz claims it should be OK for shot 6. |
| Feb 18 2005 01:59:48:590PM | 1050218006 | Joseph Snipes | Shot 6: Return Br0 to -0.0025 T and EF4 to -1340 A. Reduced prepuff by 1 ms to 15 ms duration. Startup looks better, but F15 is still flaky and it disrupted in rampdown at the same time as on shot 5. |
| Feb 18 2005 02:19:23:167PM | 1050218007 | Joseph Snipes | Shot 7: OH1 test at 10 kA to check the flux loop F15. The flux loop looks fine now. |
| Feb 18 2005 02:27:39:840PM | 1050218008 | Joseph Snipes | Shot 8: Repeat shot 6. NINJA turned back on puffing D2 at 1.3 s. Good shot. |
| Feb 18 2005 02:44:33:540PM | 1050218009 | Joseph Snipes | Shot 9: Repeat. Good shot. |
| Feb 18 2005 02:58:09:463PM | 1050218010 | Joseph Snipes | Shot 10: Increased nl04 to 7 x 10^19 m^-2. Good shot. |
| Feb 18 2005 03:11:24:840PM | 1050218011 | Joseph Snipes | Shot 11: Increased nl04 to 8 x 10^19 m^-2 ramping up more slowly than on shots 2 adn 3. Good shot. |
| Feb 18 2005 03:25:05:090PM | 1050218012 | Joseph Snipes | Shot 12: Reduced CLEARIN by 0.005 m to 0.005 m and increased RCUR by 0.0025 m to 0.6605 m to decrease the inner gap by 0.5 cm for Ken Marr. Decreased prepuff by 1 ms to 14 ms duration. Good shot. |
| Feb 18 2005 03:37:28:963PM | 1050218013 | Joseph Snipes | Shot 13: Needed to reduce RCUR rather than increase RCUR to keep a constant outer gap. So, I've now changed RCUR from 0.6605 to 0.6555 m. Fizzle! |
| Feb 18 2005 03:50:43:620PM | 1050218014 | Joseph Snipes | Shot 14: Try again with no changes. Good shot. |
| Feb 18 2005 04:03:14:090PM | 1050218015 | Joseph Snipes | Shot 15: Earl suggests keeping CLEARIN at 0.005 m throughout the rampdown to avoid disruptions in the rampdown. So, I've changed CLEARIN to maintain 0.005 m out to 1.9 s. Reduced prepuff by 1 ms to 13 ms duration. Good shot. |
| Feb 18 2005 04:17:29:400PM | 1050218016 | Joseph Snipes | Shot 16: Reduced ZXL to 0 to attempt to avoid disruptions in rampdown. Reduced CLEARIN and RCUR by 4 mm to decrease the inner gap and maintain the outer gap where it was throughout the shot. Fizzle! |
| Feb 18 2005 04:30:31:040PM | 1050218017 | Joseph Snipes | Shot 17: Increased EF4 current by 10 A to -1330 A. Increased prepuff by 1 ms to 14 ms duration. Dud! |
| Feb 18 2005 04:47:41:527PM | 1050218018 | Joseph Snipes | Shot 18: Decreased EF4 by 25 A to -1355 A. Good shot. |
| Feb 18 2005 05:09:40:120PM | 1050218019 | Joseph Snipes | Shot 19: Increased CLEARIN after 1.64 s to attempt to avoid the disruptions in rampdown. Reduced CLEARIN during the flattop by 1 mm to reduce the inner gap to 1 cm. Increased RCUR by 1.5 mm to reduce the outer gap a bit. Good shot. |
| Feb 18 2005 05:13:54:590PM | 1050218020 | Joseph Snipes | Shot 20: Increased RCUR in the rampdown to attempt to keep the plasma diverted and avoid rampdown disruptions. Good shot. |
| Feb 18 2005 05:33:13:387PM | 1050218021 | Joseph Snipes | Shot 21: Repeat. Good shot. |
| Feb 18 2005 05:45:39:603PM | 1050218022 | Joseph Snipes | Shot 22: Repeat. Good shot. |
| Feb 18 2005 05:54:10:790PM | 1050218023 | Joseph Snipes | Shot 23: Repeat. Fizzle! |
| Feb 18 2005 06:18:51:760PM | 1050218024 | Joseph Snipes | Shot 24: Reduced prepuff by 2 ms to 13 ms duration. Good shot. |
| Feb 18 2005 06:33:37:307PM | 1050218025 | Joseph Snipes | Shot 25: Increased prepuff by 1 ms again to 13 ms duration to try to avoid the early runaways. Good shot. |
| Feb 18 2005 06:46:37:620PM | 1050218026 | Joseph Snipes | Shot 26: Repeat. Good shot. |
| Feb 18 2005 06:59:23:400PM | 1050218027 | Joseph Snipes | Shot 27: Repeat. Good shot. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 12:09:23:620PM | Plasma | Ok | |
| 2 | 12:45:23:743PM | Plasma | Ok | |
| 3 | 01:04:09:040PM | Plasma | Ok | |
| 4 | 01:17:17:917PM | Plasma | Ok | |
| 5 | 01:34:12:150PM | Plasma | Ok | |
| 6 | 01:47:28:790PM | Plasma | Ok | |
| 7 | 02:16:44:400PM | Test | Ok | OH1 PLC 10kA Test shot for a flux loop test |
| 8 | 02:25:59:667PM | Plasma | Ok | |
| 9 | 02:42:50:137PM | Plasma | Ok | |
| 10 | 02:55:49:277PM | Plasma | Ok | |
| 11 | 03:09:47:870PM | Plasma | Ok | |
| 12 | 03:22:45:090PM | Plasma | Ok | |
| 13 | 03:35:44:400PM | Plasma | Ok | |
| 14 | 03:48:33:713PM | Plasma | Ok | |
| 15 | 04:01:22:493PM | Plasma | Ok | |
| 16 | 04:13:52:743PM | Plasma | Ok | |
| 17 | 04:28:14:480PM | Plasma | Ok | |
| 18 | 04:40:43:243PM | Plasma | Ok | |
| 19 | 04:59:42:493PM | Plasma | Ok | |
| 20 | 05:12:03:197PM | Plasma | Ok | |
| 21 | 05:25:58:557PM | Plasma | Ok | |
| 22 | 05:39:52:213PM | Plasma | Ok | |
| 23 | 05:52:12:930PM | Plasma | Ok | |
| 24 | 06:17:19:213PM | Plasma | Ok | |
| 25 | 06:29:49:480PM | Plasma | Ok | |
| 26 | 06:45:04:620PM | Plasma | Ok | |
| 27 | 06:57:26:137PM | Plasma | Ok | |