| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Yuichi Takase |
| Physics operator(s): | Steve Horne |
| Engineering operator(s): | Frank Silva,Joe Daigle |
| Engineering Operator Run Comment |
| ICRF Takase/Horne/Silva Daigle |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:12:257PM |
| Author: To Be Determined |
| MP077A ICRF Heating in L-Mode Plasmas SL: Takase PO: Horne EO: Silva/Daigle Plan: 1. Ip=0.8MA density scan (nel_04=0.5, 0.7, 1.1, 1.5) 2. Ip=0.4MA density scan (nel_04=0.5, 0.7, 1.1, 1.5) 3. Ip=1.1MA density scan (nel_04=0.5, 0.7, 1.1, 1.5) Plan 1. was partially accomplished. The intended RF power steps were 0, 1, 2, and 3MW (150msec each). Plasma current flat-top was extended to 1.25sec to accomodate this power programming. The outer gap was reduced to 1cm to prevent H-modes. 3MW RF pulse was obtained on shots 12, 14, and 17, all at nel_04=1.1e20. The duration of the 3MW pulse was limited by H-mode transitions. The maximum RF power levels were 1.5MW for lower densities (nel_04<=0.7e20) and 2MW for higher density (nel_04=1.5e20). Early in the run there were large amplitude (over 1MW peak-peak) oscillations on the E-port RF power (and on D-port power to a lesser extent). This was determined to be due to beating between the slightly different frequencies used for the two transmitters (they talk to each other through the plasma). We solved the problem by using a single RF signal generator (as we have been until last week). The E-port antenna and the transmitter ran very well today. D-port (which has been running reliably until last week) had problems today, possibly arcing on the antenna. ------------------------------------------------------------------------------ OH2 tests before the run (Shots 1-4) Blew a bunch of fuses on shot 02 (switch in the wrong position, and the interlock was bypassed!) Loaded 950210022 for shot 05, changed density to nel_04=1.1e20. Shot 05 Fiz OH2U (10:15am) 06 Pla no RF .85MA 1.1 07 Pla disr .85MA 1.1 08 Pla disr .85MA 1.1 09 Pla disr 10 Pla .85MA 1.1 11 Pla .85MA 1.1 12 Pla .85MA 1.1 13 Pla disr .85MA 1.1 14 Pla .85MA 1.1 15 Fiz 16 Pla .85MA 1.1 17 Pla .85MA 1.1 18 Pla .85MA 0.7 19 Pla .85MA 0.7 20 Pla .85MA 0.7 21 Pla .85MA 0.7 22 Dud 23 Pla .85MA 0.7 24 Pla .85MA 0.7 25 Pla disr .85MA 0.5 26 Pla disr .85MA 0.5 27 Pla .85MA 0.6 28 Pla .85MA 1.5 29 Pla disr .85MA 1.5 30 Pla .85MA 1.5 |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:53:207PM |
| Author: To Be Determined |
| Run 950215; MP 77A. Takase, Horne, Silva, Daigle. Run had a late start due to OH2 supply modifications, blown fuses, other problems. The modifications are advertised to give us more OH2 voltage. I haven't checked this. First plasma attempt was 5, a fizzle; shot 6 went. Magnetics in segment 1 not touched all day. This seems like a robust startup. However plenum pressure should be watched; may have contributed to fizzle on shot 15 and/or the wierd density behavior on shot 29. Problems: Reciprocating probe position trace unreliable; associated with rf, but details unclear. Something broke starting shot 27 and probe didn't fire. Various triggering problems were detected. RF: E port ran well, D port erratic. 3 MW on shots 12,14,17. Diagnostics -- apparently there's a plastic flange cover somewhere in the ECE system which attenuates the signal, making it not very useful for startup. Score: Two fizzles, one dud (ps failure), 4 power tests, 23 plasmas. Shot log: load 950210022 Tweak NL and x-point programming current limit oh1 to 26 ka set knob in power supply First two shots were tests. Second blew fuses in oh2L. Tedious expedition to replace fuses. Load, coldstart at 9:35 fill at 2.0e-5 shot 3 oh2 u forward gates. Open circuit 4 forward and reverse bridges , with the upper and lower oh2. these are also open ckt tests They were successful; OH2 at 25 ka might produce more than 100 v at 25 ka. Up from 40 or so. 5 First plasma attempt. 10:10. OH2U fault? fizzle. OH2 supplies tweaked. 6 Reduce fill to 1.4. Good shot, past the fizzle detector. 7. Drop lower x point 1 cm in a ramp. It ends up at -3 cm, 1 sec. Argon on at 300 msec. This is a little scary. Plasma, breaker pulled. Disr. at 1.02, vertical oscillation precedes so VDE. h-mode at 800 msec. The elongation touches 1.8 at the disruption. 8. Move argon to 400 msec. move rcur out 3 mm to reduce outer gap. stop zxl ramp at -2.5 cm. Drop fast p gain from 3 to 2 at 1.0 sec. Plasma, breakers pulled. Disrupts due to growing z oscillation. 9. Instead of dropping fast p at 1.0 sec, raise it from 3 to 4 there. Tweak zxl 10 more msec argon. Disruption at .48 sec due to power supply fault. Argon injection was coincidence, maybe. 10. No changes. Good shot. The vertical quiver turns off at 1 sec. Move that switch back to 330 msec. for next. 11. tweak upper and lower xpoints to satisfy recip probe. Breakers tripped during rampdown. Shot ok otherwise. 12 zxl back down to -3 cm. Hope that the gain tweak on shot 10 is sufficient to hold it. shot ran through rampdown. Elongation 1.8,; xpoint is way low. Unique shot. 13 RELOAD SHOT 11 PROBE GOES IN AT .55,.7,.85 EF2 railed, lost it at 500 msec. 14 raise ef4 current to 2500 A. zxl up 5 mm, rxl in 3mm. Good shot. 15 probe timing .65,.8,.95. Tweak slow z gains in rampdown to protect oh2 supplies. Fizzle. 16 fill to 1.7e-5. Plasma. Went past fizzle detector; fuses blew on inversion at 1.7 sec. 17 Move fizzle detector to 1.6 sec. Shouldn't matter, but you never know. Nice plasma, two fuses blown on rampdown. 18 Reduce nel to 7.e19. Nice plasma, complete rampdown, no faults. 19 repeat Good plasma shot. 20 repeat. Good plasma shot, disrupted on rampdown. 21 adjust lower x-point to stay low during rampdown. Minor density tweak during rampdown. Plasma, no change from last shot. 22 Make the end_of_flat-top density spike bigger. power supply fault (alternator) during precharge. 23 No change. Good shot, with rampdown. 24 see 23 25 Reduce nl to 5.e19. Disrupts at .9 or so -- 26 Repeat; disrupts earlier -- .6. 27 Raise nl to 6.e19 Worked, with rampdown. 28 nl 1.5e20 Nice shot. Sharkfin on rampdown. 29 Start density rampdown 50 msec earlier Extend argon puff 10 msec Very strange shot. Looked like a marf on the TV early; after the current rises a bit the marf gets swallowed, leading to a big density rise. 30 Slow down the nl ramp to deal with wierd density last shot. Much better density control. End run. |
| Session Leader Comments | |||
| Feb 15 1995 10:21:26:070AM | 950215001 | Yuichi Takase | MP077A ICRF Heating in L-Mode Plasmas
Plan: 0.8MA density scan (nel_04=0.5, 0.7, 1.1, 1.5) 0.4MA density scan (nel_04=0.5, 0.7, 1.1, 1.5) 1.1MA density scan (nel_04=0.5, 0.7, 1.1, 1.5) Shot 01: OH2 test |
| Feb 15 1995 10:22:48:420AM | 950215002 | Yuichi Takase | Shot 02: OH2 test
Blew a bunch of fuses. Switch was not in the correct position, and the interlock was bypassed! |
| Feb 15 1995 10:23:15:830AM | 950215003 | Yuichi Takase | Shot 03: OH2 test
|
| Feb 15 1995 10:23:32:650AM | 950215004 | Yuichi Takase | Shot 04: OH2 test
|
| Feb 15 1995 10:25:00:830AM | 950215005 | Yuichi Takase | Shot 05: Finally, plasma attempt (10:15am).
Loaded 950210022, nel_04=1.1e20 Fizzle, OH2U fault. |
| Feb 15 1995 10:56:01:550AM | 950215006 | Yuichi Takase | Shot 06: Plasma (no RF)
|
| Feb 15 1995 11:29:52:330AM | 950215007 | Yuichi Takase | Shot 07: Plasma
D-port 1.0MW E-port 1.5+/-0.5MW (large osc) |
| Feb 15 1995 11:30:15:500AM | 950215008 | Yuichi Takase | Shot 08: Plasma
D-port 1.3MW E-port 1.5+/-0.5MW (large osc) |
| Feb 15 1995 11:39:30:750AM | 950215009 | Yuichi Takase | Shot 09: Early disruption
Still working on equilibrium |
| Feb 15 1995 12:16:16:870PM | 950215010 | Yuichi Takase | Shot 10: Plasma
Still working on equilibrium. Also working on RF power osc problem. |
| Feb 15 1995 12:17:22:930PM | 950215011 | Yuichi Takase | Shot 11: Plasma
no D-port |
| Feb 15 1995 12:37:12:160PM | 950215012 | Yuichi Takase | Shot 12: Plasma
RF 1MW(0.6-0.75s), 2MW(0.75-0.9s), 3MW(0.9-1.05s) D-port tripped early. |
| Feb 15 1995 01:00:23:510PM | 950215013 | Yuichi Takase | Shot 13: Plasma
going back to shot 011 Disrupted early |
| Feb 15 1995 01:12:56:680PM | 950215014 | Yuichi Takase | Shot 14: Plasma
X point higher and in P_RF = 1.0(0.7-0.85s), 2.0(0.85-1.00s), 3.0(1.00-1.15s) D-port tripped early (at H-mode) |
| Feb 15 1995 01:15:59:480PM | 950215015 | Yuichi Takase | Shot 15: Fizzle
|
| Feb 15 1995 02:00:30:340PM | 950215016 | Yuichi Takase | Shot 16: Plasma
D-port tripped early |
| Feb 15 1995 02:03:02:970PM | 950215017 | Yuichi Takase | Shot 17: Plasma
Both tripped early (@ H-mode) Lower density (nel_04=0.7) for the next shot. |
| Feb 15 1995 02:13:29:070PM | 950215018 | Yuichi Takase | Shot 18: Plasma
D-port tripped early nel_04=0.7e20 |
| Feb 15 1995 02:53:04:200PM | 950215019 | Yuichi Takase | Shot 19: Plasma
D-port tripped early nel_04=0.7e20 |
| Feb 15 1995 02:53:20:680PM | 950215020 | Yuichi Takase | Shot 20: Plasma
D-port tripped early nel_04=0.7e20 |
| Feb 15 1995 02:55:59:560PM | 950215021 | Yuichi Takase | Shot 21: Plasma
D-port tripped early nel_04=0.7e20 |
| Feb 15 1995 03:32:18:060PM | 950215022 | Yuichi Takase | Shot 22: Dud (alternator problem)
|
| Feb 15 1995 03:34:40:850PM | 950215023 | Yuichi Takase | Shot 23: Plasma
D-port tripped early again. |
| Feb 15 1995 03:44:32:820PM | 950215024 | Yuichi Takase | Shot 24: Plasma
D-port tripped early again. Going to nel_04=0.5 for the next shot. |
| Feb 15 1995 04:21:01:440PM | 950215025 | Yuichi Takase | Shot 25: Plasma (disrupted @ .93s)
|
| Feb 15 1995 04:21:50:400PM | 950215026 | Yuichi Takase | Shot 26: Plasma (disrupted @ .66s)
|
| Feb 15 1995 04:23:40:730PM | 950215027 | Yuichi Takase | Shot 27: Plasma
nel_04=0.6e20 D-port tripped early |
| Feb 15 1995 04:42:17:570PM | 950215028 | Yuichi Takase | Shot 28: Plasma
nel_04=1.5e20 D-port tripped early |
| Feb 15 1995 04:55:28:260PM | 950215029 | Yuichi Takase | Shot 29: Plasma
nel_04=1.5e20 (programmed) Strange density jump @ 0.34s. |
| Feb 15 1995 05:06:15:990PM | 950215030 | Yuichi Takase | Shot 30: Plasma
nel_04=1.5e20 P_RF=1.0(.7-.85s), 2.0(.85-1.15s) |
| Physics Operator Comments |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:18:31:390AM | Test | Ok | open ckt oh test |
| 2 | 08:27:21:410AM | Test | Ok | oh2 fault |
| 3 | 09:46:26:230AM | Test | Ok | oh2 upper forward bridge test |
| 4 | 10:00:26:680AM | Test | Ok | test ok |
| 5 | 10:11:19:580AM | Plasma | Ok | oh2 upper fault |
| 6 | 10:32:29:310AM | Plasma | Ok | no fault |
| 7 | 10:52:12:950AM | Plasma | Ok | comm fault oh2l |
| 8 | 11:10:08:000AM | Plasma | Ok | oh2 comm fail plasma caused |
| 9 | 11:28:12:150AM | Plasma | Ok | comm fault |
| 10 | 11:41:53:480AM | Plasma | Ok | comm faults |
| 11 | 12:01:01:920PM | Plasma | Ok | comm faults all 5 pf breaker supplies |
| 12 | 12:20:58:140PM | Plasma | Bad | no faults |
| 13 | 12:41:57:020PM | Plasma | Ok | oh2 U comm fault |
| 14 | 12:58:12:370PM | Plasma | Ok | comm faults all 5 |
| 15 | 01:14:07:150PM | Plasma | Ok | No Faults. |
| 16 | 01:27:03:070PM | Plasma | Ok | comm fault OH2U&L OH1& EF1U |
| 17 | 01:52:32:030PM | Plasma | Ok | Comm fault oh2U&L |
| 18 | 02:07:04:410PM | Plasma | Ok | No Faults. |
| 19 | 02:18:09:880PM | Plasma | Ok | no faults |
| 20 | 02:35:43:280PM | Plasma | Ok | NO Faults. |
| 21 | 02:51:36:020PM | Plasma | Ok | No Faults. |
| 22 | 03:04:54:380PM | Plasma | Bad | Loss Alt. Voltage. |
| 23 | 03:22:54:340PM | Plasma | Ok | No faults. |
| 24 | 03:33:43:860PM | Plasma | Ok | No Faults. |
| 25 | 03:45:49:820PM | Plasma | Ok | No Faults. |
| 26 | 03:58:46:170PM | Plasma | Ok | No Faults. |
| 27 | 04:09:37:810PM | Plasma | Ok | No Faults |
| 28 | 04:29:01:770PM | Plasma | Ok | Comm fault OH1, Oh2U&L, EF1 U&L |
| 29 | 04:42:18:340PM | Plasma | Ok | comm fault oh2l, oh1,ef1u |
| 30 | 04:58:42:010PM | Plasma | Ok | No Faults. |