| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Steve Wolfe |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Bill Cochran,Gary Dekow,Frank Silva |
| Engineering Operator Run Comment |
| z |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:22:757PM |
| Author: To Be Determined |
| Session Leader's summary for Wednesday, 3/29/2000 Reverse field Startup SL: Wolfe PO: Granetz EO: Silva,Cochran,Dekow The plan was to continue the startup and tokamak conditioning discharges from yesterday. Shot 2 was the best shot so far, with 800kA to 1.3sec, terminated when the OH's ran into the (reduced) current limit of 22kA. However, the F28 flux loop (decant loop), which had been observed to be drooping following yesterday's run, broke at the disruption. Re-doing all the PCS predictors, including a new re-write of FLUXIHH and generating a new MHD_STATIC tree for the RECON_VAC predictors, updating the hybrid model file, plus modifying the processed flux expressions in the MAGNETICS tree, took over four hours. The process was not helped by a plague of computer crashes. Meanwhile, the leak at f-port is still there, and there may be another one someplace else. There is a lot of ice around F-port, probably contributing to the problem. Once we got back on the air, we had plasmas on shots #4 (runaways), 7, and 10. Shot 10 is probably the best place to start tomorrow. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:10:160PM |
| Author: To Be Determined |
| Physics operator summary for run 1000329: MP ? -- Obtain and improve plasma initiation with reversed Bt SL: S. Wolfe PO: R. Granetz EO: F. Silva/B. Cochran/G. Dekow Summary: We had a 1.3 second long plasma on shot 02, but it terminated in a disruption which broke the F28 flux loop across H-port. Everything went downhill from there. The F27 loop, which is redundant with F28, is working fine, but patching it into the hybrid estimator software took a long time. Plus, the new estimators give slightly different results, so we essentially had to start from scratch again, at least as far as getting a robust null. Lump in a few annoying computer crashes, a few PCS oddities that we unexpectedly tripped on, and we essentially ended up making little or no progress. Scorecard: 4 plasmas (only 1 reached flattop, shot 02) 7 fizzles 0 duds (0 due to lack of one or more power supplies) 0 test 0 aborted ---------- 11 total ------------------------------------------------------------------------------- Engineering setup for Wednesday, 1000329: Run will begin at 09:00 and end at 17:00 Overnight ECDC in D2, stopping 1 hour prior to the run. Power system setup as on 1000328014. Note: Fizzle detector should be on from t=0.5 to 1.7 s (for reasons having to do with the OH2L coax) Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED leave B-side upper as is Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled leave J-bottom as is Hybrid DISABLED The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV ------------------------------------------------------------------------------- Physics operator's setup for Wednesday, 1000329. MP ? -- Obtain and explore initiation with reversed Bt Session leader: S. Wolfe Physics operator: R. Granetz Plans: More tweaking of breakdown and rampup. Clean up machine. RF will probably not be available. ------------------------------------------------------------------------------- Note: Overnight ECDC in D2 was requested, but we actually got about 3.5 hours total. ECDC was stopped 1 hour before run. Hybrid coldstart done by Steve Wolfe; no errors found Loaded 1000328014. We did not swap F27 for F28 in either the hybrid estimators nor the processed fluxes. The power engineers have added a fizzle delay to all the OH PLCs. Today we will: . set the fizzle detector start back to .08 seconds . set all the OH PLC fizzle delays to 0.500 seconds . set the TF PLC fizzle delay to 0.600 seconds ------------------------------------------------------------------------------- Shot 01 -- Fizzle. Fill pressure is a touch high. Null is okay, but Bz needs to come up faster. Next shot: reduce pre-fill puff from 23 to 20 ms, and increase magnitude of early EF3 voltage from -2500 to -2800 V. Shot 02 -- Plasma. Ip=0.8 MA, hard disruption at t=1.32 s. Probably ran into the recently decreased PLC current limits on the OH supplies. Note: F28 broke at the disruption. It is now electrically open. F29 is still okay. There will be a long break while Steve reprograms the hybrid to use F27 instead of F28. I will change the processed flux accordingly. During the break, we have ECDC on as much as possible. Next shot: increase OH1 PLC limit from 22 to 27 kA, and the OH2's from 22 to 26 kA. (I'm referring to the limits on the reverse bridge.) Swap F27 for F28 in the hybrid estimators and the processed fluxes. We've had several hours of computer crashes, flux estimator code work, PCS estimator updating, PCS bug recovery, more computer crashes, etc. It's now 13:45 and we're finally ready to go again. Shot 03 -- Fizzle. Br0 looked a little high, but the null looks very different, and I don't know whether it's due to the new flux loops in the analysis or in the hybrid or both. Next shot: reduce Br0 by 1 mT. Shot 04 -- Plasma. Disrupted at t=0.3 s. Br0 doesn't seem to have changed. The startup hit something and almost didn't make it. Looks like there were lots of runaways. Next shot: increase early gas fueling. Note: there might have been a bitbus problem, which means that the preceding changes for shot 04 might not have actually gotten to the hybrid. I just did a coldstart, successfully. Shot 05 -- Fizzle. Rather weak. Br0 looks good. Breakdown traces look very similar to shot 02. Next shot: retry with no changes Shot 06 -- Fizzle. Rather weak again. It seemed to like having Br0 slightly positive (at least according to our latest calculations). Next shot: increase Br0 back up to 0.000 mT. Shot 07 -- Plasma. Died at t=0.21 s, after several disruptions. Excellent current rise. Can't see anything obviously wrong, except for lots of dirt. Next shot: repeat with no changes. Shot 08 -- Fizzle. Next shot: repeat with no changes. Shot 09 -- Fizzle. A little too much Bz. Next shot: add 15 amps to IC_EF4 in segment 1. Shot 10 -- Plasma. Hard disruption at t=0.38 s. The recon_vac:v_loop is broken, and has been broken since we swapped F27 for F28 after shot 02. This shot was much better behaved than the previous short plasmas. Next shot: no changes. Shot 11 -- Fizzle. End of run. |
| Session Leader Comments | |||
| Mar 29 2000 09:44:42:857AM | 1000329001 | Steve Wolfe | shot#1: fizzle. f28 still looks ok. Bz0 looks too positive at t=0. CII~.015 fill looks high ~.09mtorr |
| Mar 29 2000 10:01:21:530AM | 1000329002 | Steve Wolfe | shot#2: plasma, to 1.3sec. Ran into the OH current rails, which had been set to 22kA (had been -30 I think) Loop voltage is 1.7V. F28 seems to have broken at the end of that shot. We will need to re-do all the predictors, etc. |
| Mar 29 2000 02:29:36:170PM | 1000329003 | Steve Wolfe | Shot 3: After several hours of re-coding, reloading PCS, and computer crashes, not to mention ECDC, ready to start up again. The only waveform changes are to remove the tf waggle. Also, the current limits on the Oh''s should be back to -26kA. Got a fizzle. Ian''s R and Z traces look funny. Otherwise not bad. PhysAOut looks ok. |
| Mar 29 2000 02:36:23:903PM | 1000329003 | Steve Wolfe | Shot 3: Ian''s FLUXIHH things in the analysis tree use the unprocessed magnetics data, and have not been updated to not use F28, so they are broken. |
| Mar 29 2000 02:49:07:340PM | 1000329004 | Steve Wolfe | Shot 4: Tweak the Br and try again. plasma to about .3 sec, lots of injections. lots of runaways. |
| Mar 29 2000 03:36:21:483PM | 1000329006 | Steve Wolfe | At the request of the RF group, turned RF tree off (set noinclude) in CMOD_MANAGE for shot 7. |
| Mar 29 2000 03:53:57:687PM | 1000329007 | Steve Wolfe | shot#7: Br tweak- plasma to .2, gets in trouble at .14 Very resistive, lots of injections. Initial current rise is very fast, and looks smooth. The F28 signal at the hybrid is hard saturated >+10V after .15sec |
| Mar 29 2000 04:47:39:577PM | 1000329010 | Steve Wolfe | shot#10: plasma to .38 sec, slight hesitation in current rise. Cleaner than 7, around 2-2.5V loop. Bob points out the recon_vac data is showing +/- 1e37 on vloop; also br, bz, dbz, etc. It's been that way since shot 3, i.e. after the change for flux loop replacement. Looks like an IDL v5.2 bug? |
| Physics Operator Comments | |||
| Mar 29 2000 08:04:19:763AM | Steve Wolfe | Bob will not be in until 8:45 or so. Running a coldstart. 08:02:32.83 All matrices respond | |
| Mar 29 2000 09:16:31:310AM | Robert Granetz | Engineering setup for Wednesday, 1000329: Run will begin at 09:00 and end at 17:00 Overnight ECDC in D2, stopping 1 hour prior to the run. Power system setup as on 1000328014. Note: Fizzle detector should be on from t=0.5 to 1.7 s (for reasons having to do with the OH2L coax) Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED leave B-side upper as is Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled leave J-bottom as is Hybrid DISABLED The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV | |
| Mar 29 2000 09:16:48:483AM | Robert Granetz | Physics operator''s setup for Wednesday, 1000329. MP ? -- Obtain and explore initiation with reversed Bt Session leader: S. Wolfe Physics operator: R. Granetz Plans: More tweaking of breakdown and rampup. Clean up machine. RF will probably not be available. | |
| Mar 29 2000 09:26:58:577AM | Robert Granetz | #4 29-MAR-2000 09:25:09.85 NEWMAIL From: NEL::IRBY To: GRANETZ, WOLFE CC: IRBY Subj: Fizzle Changes We have added a fizzle delay to all the OH PLCs. Today we will: . set the fizzle detector start back to .08 seconds . set all the OH PLC fizzle delays to 0.500 seconds . set the TF PLC fizzle delay to 0.600 seconds jim | |
| Mar 29 2000 09:32:53:950AM | Robert Granetz | Note: Overnight ECDC in D2 was requested, but we actually got about 3.5 hours total. ECDC was stopped 1 hour before run. Hybrid coldstart done by Steve Wolfe; no errors found Loaded 1000328014. We did not swap F27 for F28 in either the hybrid estimators nor the processed fluxes. | |
| Mar 29 2000 09:49:05:403AM | 1000329001 | Robert Granetz | Shot 01 -- Fizzle. Fill pressure is a touch high. Null is okay, but Bz needs to come up faster. Next shot: reduce pre-fill puff from 23 to 20 ms, and increase magnitude of early EF3 voltage from -2500 to -2800 V. |
| Mar 29 2000 01:28:23:653PM | 1000329002 | Steve Wolfe | All the codes have been updated. Bob went through and recalculated all predictors and did a LOAD/CLEAN but it gave a controller out-of-range error on SEG1 RCUR; it turns out the controller was right on the edge, and since he had to lower the predictor factor it pushed it over; note that seg1 has hand-made controllers. Before we could complete updating the controller, SPANNA crashed. While it is re-booting, I''m going to try. The trick is going to be to give it a time-constant of 10. in each row, then change the common factor to 9.0 on the time_constant window. OK everything and LOAD/CLEAN |
| Mar 29 2000 01:44:59:857PM | 1000329002 | Robert Granetz | We''ve had several hours of computer crashes, flux estimator code work, PCS estimator updating, PCS bug recovery, more computer crashes, etc. It''s now 13:45 and we''re finally ready to go again. |
| Mar 29 2000 01:48:40:153PM | 1000329002 | Steve Wolfe | Doing a new coldstart, since computers have been crashing (and there is a new tree there anyway). OK, it coldstarted ok. I couldn''t look at the log file because my quota got drained by a 5.5Mbyte mail message. |
| Mar 29 2000 03:11:32:530PM | 1000329002 | Robert Granetz | Shot 02 -- Plasma. Ip=0.8 MA, hard disruption at t=1.32 s. Probably ran into the recently decreased PLC current limits on the OH supplies. Note: F28 broke at the disruption. It is now electrically open. F29 is still okay. There will be a long break while Steve reprograms the hybrid to use F27 instead of F28. I will change the processed flux accordingly. During the break, we have have ECDC on as much as possible. Next shot: increase OH1 PLC limit from 22 to 27 kA, and the OH2's from 22 to 26 kA. (I'm referring to the limits on the reverse bridge.) Swap F27 for F28 in the hybrid estimators and the processed fluxes. |
| Mar 29 2000 02:41:24:250PM | 1000329003 | Robert Granetz | Shot 03 -- Fizzle. Br0 looked a little high, but the null looks very different, and I don''t know whether it''s due to the new flux loops in the analysis or in the hybrid or both. Next shot: reduce Br0 by 1 mT. |
| Mar 29 2000 03:04:38:653PM | 1000329004 | Robert Granetz | Shot 04 -- Plasma. Disrupted at t=0.3 s. Br0 doesn''t seem to have changed. The startup hit something and almost didn''t make it. Looks like there were lots of runaways. Next shot: increase early gas fueling. |
| Mar 29 2000 03:04:45:763PM | 1000329004 | Robert Granetz | Note: there might have been a bitbus problem, which means that the preceding changes for shot 04 might not have actually gotten to the hybrid. I just did a coldstart, successfully. |
| Mar 29 2000 03:22:24:513PM | 1000329005 | Robert Granetz | Shot 05 -- Fizzle. Rather weak. Br0 looks good. Breakdown traces look very similar to shot 02. Next shot: retry with no changes |
| Mar 29 2000 03:30:48:327PM | 1000329006 | Robert Granetz | Shot 06 -- Fizzle. Rather weak again. It seemed to like having Br0 slightly positive (at least according to our latest calculations). Next shot: increase Br0 back up to 0.000 T. |
| Mar 29 2000 03:52:45:280PM | 1000329007 | Robert Granetz | Shot 07 -- Plasma. Died at t=0.21 s, after several disruptions. Excellent current rise. Can't see anything obviously wrong, except for lots of dirt. Next shot: repeat with no changes. |
| Mar 29 2000 04:04:17:187PM | 1000329008 | Robert Granetz | Shot 08 -- Fizzle. Next shot: repeat with no changes. |
| Mar 29 2000 04:28:26:937PM | 1000329009 | Robert Granetz | Shot 09 -- Fizzle. A little too much Bz. Next shot: add 15 amps to IC_EF4 in segment 1. |
| Mar 29 2000 04:47:51:577PM | 1000329010 | Robert Granetz | Shot 10 -- Plasma. Hard disruption at t=0.38 s. The recon_vac:v_loop is broken, and has been broken since we swapped F27 for F28 after shot 02. This shot was much better behaved than the previous short plasmas. Next shot: no changes. |
| Mar 29 2000 05:00:15:310PM | 1000329011 | Robert Granetz | Shot 11 -- Fizzle. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:37:13:293AM | Plasma | Ok | no faults/plasma |
| 2 | 09:51:16:670AM | Plasma | Ok | no faults/plasma |
| 3 | 02:20:28:687PM | Plasma | Ok | Fizzle |
| 4 | 02:43:35:280PM | Plasma | Ok | |
| 5 | 03:11:04:530PM | Plasma | Ok | No Plasma |
| 6 | 03:25:59:793PM | Plasma | Ok | No Plasma |
| 7 | 03:43:07:280PM | Plasma | Ok | Supplies Okay |
| 8 | 03:58:02:373PM | Plasma | Ok | Supplies okay |
| 9 | 04:22:11:700PM | Plasma | Ok | No Plasma |
| 10 | 04:36:30:187PM | Plasma | Ok | |
| 11 | 04:58:43:013PM | Plasma | Ok | |