| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Paul Bonoli |
| Physics operator(s): | Bill Rowan |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| MP #277 Internal Transport Barrier Studies at 4.5 T with Simultaneous an |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:26:023PM |
| Author: To Be Determined |
| Run Summary for MP 277A: Internal Transport Barrier Studies at 4.5T with Simultaneous Central and Off-axis ICRF Heating 1001212 Physics Operator: Bill Rowan Session Leader: Paul Bonoli ____________________________________________________________________________ Run Summary ____________________________________________________________________________ The run started at about 1:00 PM, ended at 5:00 PM, and we took 13 shots. Because additional purging and pump-down of the J-port transmission line was required, we decided to go to part (b) of the run plan immediately and reproduce the density barrier mode at 4.5 T with off-axis ICRF heating at 80 MHz. We then intended to take 5-6 shots so that T_i and plasma rotation profiles could be mapped out with HIREX. We succeeded in producing a very nice density barrier mode on Shot 010 (first plasma of the day!) with only 1 MW of ICRF heating from D-port. On shot 010 the NROOTZ_eff increased to almost 5 X 10^20. Halfway through the desnity increase (at 1.08 sec) the toroidal rotation velocity from HIREX went to zero and subsequently reversed direction. The first 9 shots were fizzles because of problems related to post boronization conditions in the tokamak. On shots 011 - 013 we attempted to get both D- and E-ports to operate simultaneously at the level of 1.0 - 1.3 MW per port. However, we ran into problems with early disruptions at 0.78 - 0.85 sec., perhaps related to impurity production from the rf antennas. Camera views of D-port revealed "arcs and sparks" on shots 010 and 011. However, views on shots 012-113 displayed quiescent D-antenna operation. For operation on Wednesday (1001213) it will probably be preferable to turn up the power levels more gradually (in steps from 0.5 MW per port, for example). ____________________________________________________________________________ Shot Summary ---------------------------------------------------------------------------- Shot Comment 001-009 Fizzle 010 H-mode & Density barrier 011 H-mode, early disruption 012 H-mode, early disruption 013 H-mode, early disruption ---------------------------------------------------------------------------- |
| Physics Operator Summaries |
| Session Leader Comments | |||
| Dec 12 2000 04:43:55:653PM | 1001212001 | Paul Bonoli | 1001212001 We will start with part (b) of the run plan - 80 MHz only to reproduce the ITB with off-axis ICRF. Once we have re-established the density barrier mode we will take a 5-6 shots to get T_i and rotation profiles using the HIREX. The 70 MHz J-port x-mission line needs further purging and pumping. Request: 800 kA, 4.5 T, nl_04 = 1.8 D & E ports pulsed from 0.7 - 1.4 sec. @ 1 MW / port Plasma fizzle - try again |
| Dec 12 2000 01:06:35:857PM | 1001212002 | Paul Bonoli | 1001212002 Request: 800 kA, 4.5 T, nl_04 = 1.8 D & E ports pulsed from 0.7 - 1.4 sec. @ 1 MW / port Load segment 1 from Friday (1001208001) Result: Another fizzle |
| Dec 12 2000 01:32:26:263PM | 1001212003 | Paul Bonoli | 1001212003 Request: 800 kA, 4.5 T, nl_04 = 1.8 D & E ports pulsed from 0.7 - 1.4 sec. @ 1 MW / port Add more gas to prefill Result: Another fizzle |
| Dec 12 2000 01:54:11:763PM | 1001212004 | Paul Bonoli | 1001212004 Request: 800 kA, 4.5 T, nl_04 = 1.8 D & E ports pulsed from 0.7 - 1.4 sec. @ 1 MW / port Now also load the engineering set up from Friday (1001208) Results: A fizzle |
| Dec 12 2000 02:10:10:687PM | 1001212005 | Paul Bonoli | 1001212005 Request: 800 kA, 4.5 T, nl_04 = 1.8 D & E ports pulsed from 0.7 - 1.4 sec. @ 1 MW / port Increase gas puff from 24ms to 28 ms Result: Another fizzle |
| Dec 12 2000 02:27:26:967PM | 1001212006 | Paul Bonoli | 1001212006 Request: 800 kA, 4.5 T, nl_04 = 1.8 D & E ports pulsed from 0.7 - 1.4 sec. @ 1 MW / port Results: No plasma - fizzle |
| Dec 12 2000 03:18:39:560PM | 1001212007 | Paul Bonoli | 1001212007 Request: 800 kA, 4.5 T, nl_04 = 1.8 D & E ports pulsed from 0.7 - 1.4 sec. @ 1 MW / port Turn on ECDC Results: Fizzle - now the gas pressure is too high. Reduce the gas puff time. |
| Dec 12 2000 03:19:13:577PM | 1001212008 | Paul Bonoli | 1001212008 Request: 800 kA, 4.5 T, nl_04 = 1.8 D & E ports pulsed from 0.7 - 1.4 sec. @ 1 MW / port No ECDC Reduced gas pressure Results: Stll got a fizzle |
| Dec 12 2000 03:24:41:450PM | 1001212009 | Paul Bonoli | 1001212009 Request: 800 kA, 4.5 T, nl_04 = 1.8 D & E ports pulsed from 0.7 - 1.4 sec. @ 1 MW / port Result: Fizzle |
| Dec 12 2000 04:05:09:280PM | 1001212010 | Paul Bonoli | 1001212010 Request: 800 kA, 4.5 T, nl_04 = 1.8 D & E ports pulsed from 0.7 - 1.4 sec. @ 1 MW / port Turned on ECDC before shot Result: Plasma !!!! Got an H-mode Got a density barrier -> V_tor goes to zero at 1.08 sec. D-port ran @ 1 MW E-port did not run |
| Dec 12 2000 04:10:47:217PM | 1001212010 | Paul Bonoli | 1001212010 Request: 800 kA, 4.5 T, nl_04 = 1.8 D & E ports pulsed from 0.7 - 1.4 sec. @ 1 MW / port Turned on ECDC before shot Result: Plasma !!!! Got an H-mode Got a density barrier -> V_tor goes to zero at 1.08 sec. NROOTZ = 4.8 X 10^20 H/D = 0.035 D-port ran @ 1 MW E-port did not run |
| Dec 12 2000 04:23:47:937PM | 1001212011 | Paul Bonoli | 1001212011 Request: 800 kA, 4.5 T, nl_04 = 1.8 D & E ports pulsed from 0.7 - 1.4 sec. @ 1 MW / port Result: Disruption at 0.8 sec., but got an H-mode transition H/D = 0.035 D-port ran E-port ran |
| Dec 12 2000 04:40:43:810PM | 1001212012 | Paul Bonoli | 1001212012 Request: 800 kA, 4.5 T, nl_04 = 1.8 Increase D-port to 1.5 MW Keep E-port at 1.0 MW Lower density by 10% Result: Got an early disruption again at 0.78 sec. - with H-mode D-port view looked good, but E-port may be causing the plasma to disrupt. |
| Dec 12 2000 04:55:49:873PM | 1001212013 | Paul Bonoli | 1001212013 Request: 800 kA, 4.5 T, nl_04 = 1.6 Lower D-port power to 1.3 MW Lower E-port power to 1.1 MW This will be the last shot. Result: Early disruption again at 0.85 sec. with an H-mode. View on D-port again looked clean. |
| Physics Operator Comments | |||
| Dec 12 2000 11:19:52:827AM | Bill Rowan | Engineering setup for Tuesday 12 Dec 2000. MP #277A Internal Transport Barrier Studies at 4.5 T with Simultaneous and Off-Axis ICRF Heating Session leaders: Bonoli Physics operator: Rowan ------------------------------------------------------------------------------- Engineering setup: ECDC in He from the end of boronization until about 2 hours before the run. Power systems as on 1000607008. Gas setup: fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled leave J-bot as is Hybrid DISABLED Enable the following gate valves: ECE, VUV, Beast, DNB Run starts at 09:00 and ends at 17:00. ------------------------------------------------------------------------------- RF Setup: XMTRs 1,2, and 4 should be made ready by 8:00 (run-on). ------------------------------------------------------------------------------- | |
| Dec 12 2000 11:36:41:700AM | Bill Rowan | Loaded shot 1000607008. Replaced NL_04 wire with NL_ZMETER from shot 1001208018 Did a cold start . Finished 12-DEC-2000 11:33:32.80 | |
| Dec 12 2000 12:55:46:280PM | 1001212001 | Bill Rowan | 001. Fizzle. Next shot: Loaded segment 01 from 1001208001. |
| Dec 12 2000 01:13:30:607PM | 1001212002 | Bill Rowan | 002. Another fizzle. Next shot. Add 2 ms to the prefill for a total of 22 ms |
| Dec 12 2000 01:38:41:187PM | 1001212003 | Bill Rowan | 003. Another fizzle. Next shot. Loaded an engineering setup from Friday. Increased the gas by 2 ms to 24 ms. |
| Dec 12 2000 01:56:05:420PM | 1001212004 | Bill Rowan | 004. Another fizzle. Next shot: Increased the gas by 4 ms to 28 ms. |
| Dec 12 2000 02:13:16:030PM | 1001212005 | Bill Rowan | 005. Another fizzle. Prefill at approx 0.07 mT Looks okay. Next shot. Raise BZ. IC_EF4 from -1300 to -1290 |
| Dec 12 2000 02:41:14:500PM | 1001212006 | Bill Rowan | 006. Another fizzle. Try ECDC in D2 for 10 minutes before the next shot |
| Dec 12 2000 02:56:19:687PM | 1001212007 | Bill Rowan | 007. Another fizzle Prefill is 0.09 mT Next shot. Reduce the prefill by 4 ms to 24 ms |
| Dec 12 2000 03:21:08:123PM | 1001212008 | Bill Rowan | 008. Another fizzle Prefill is 0.07 mT Next shot. Reduce BZ IC_Ef4 from -1290 to -1300 |
| Dec 12 2000 03:41:58:217PM | 1001212009 | Bill Rowan | 009. Another fizzle ECDC in D2 before the next shot. |
| Dec 12 2000 04:01:43:403PM | 1001212010 | Bill Rowan | 010. Plasma. At last. Next shot. No changes |
| Dec 12 2000 04:26:14:733PM | 1001212011 | Bill Rowan | 011. Plasma. Disruption at 0.87 s. Next shot. Lower density by 10% |
| Dec 12 2000 04:38:54:107PM | 1001212012 | Bill Rowan | 012. Plasma. Disruption at 0.78 s Next shot. No changes. |
| Dec 12 2000 04:52:23:590PM | 1001212013 | Bill Rowan | 013. Plasma Disruption at 0.85 s Last shot. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 12:44:38:733PM | Plasma | Ok | All Power Supplies Fired |
| 2 | 01:01:44:077PM | Plasma | Ok | |
| 3 | 01:20:14:200PM | Plasma | Ok | |
| 4 | 01:44:50:590PM | Plasma | Ok | |
| 5 | 02:01:41:170PM | Plasma | Ok | |
| 6 | 02:18:40:047PM | Plasma | Ok | |
| 7 | 02:44:11:780PM | Plasma | Ok | |
| 8 | 03:01:29:890PM | Plasma | Ok | |
| 9 | 03:22:25:373PM | Plasma | Ok | |
| 10 | 03:51:28:827PM | Plasma | Ok | |
| 11 | 04:09:35:187PM | Plasma | Ok | |
| 12 | 04:30:47:670PM | Plasma | Ok | |
| 13 | 04:49:44:373PM | Plasma | Ok | |