| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Steve Wukitch |
| Physics operator(s): | Earl Marmar |
| Engineering operator(s): | Gary Dekow,Frank Silva |
| Engineering Operator Run Comment |
| MP 214/Marmer/Silva |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:19:553PM |
| Author: To Be Determined |
| Engineering Setup for Wednesday, 990224: 2 hours ECDC in D_2 before the run Power supply settings should be taken from 990223021. TF under hybrid control Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled pump B-side upper and leave evacuated Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled fill J-bottom with 2 psi of Kr Hybrid DISABLED We want hydrogen and helium-4 available, for possible use in B-side upper, so the neon bottle should be removed from the system and replaced with hydrogen. Load from 990223021 for segment 1 990219024 for segment 2 (.8 MA, 5.4 T); leave B_T jog for ECE The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV ------------------------------------------------------------------------------- Run Plan for 990224: MP 214 ICRF Development Start with a fiducial-like .8 MA shot, with an added B_T jog for ECE pedestal measurements during RF. Move plasma up 1 to 2 cm for edge Thomson evaluation. Scan toroidal field from 5 T to 6 T to move RF resonance. Scan outer gap. Raise I_p to 1 MA. Density scans are also possible. We will be aiming for reliable simultaneous high power operation of the D and E port systems. ST1: 590 PS1: 422 ST2: 2390 PS2: 1043 001 plasma - multiple H-modes faults on #2 H/D increases from 0.6-0.1 during RF next shot: reduce power so both run cleanly 002 plasma - H-mode screen overcurrent on #1 - retrys are too fast #2 fault ST1: 590 PS1: 422 ST2: 2476 PS2: 992 003 plasma - H-mode still have faults #2 fault seems induced by #1 004 plasma - H-modes #2 fault seems induced by #1 next shot: retune and raise power 005 plasma - H-modes 006 plasma - H-modes 007 plasma - H-modes 008 plasma - H-modes 009 plasma - H-modes between shot 5 minute ECDC in D 010 plasma - early disruption next shot: turn off Ar to see if EDA remains 011 plasma - RF still faulting next shot; lower RF power by 2 012 plasma Faults seem to be real events - D phase balance and E arc detector correspond but the traces are going the correct direction. 013 plasma Same faulting problem - Lower the power to 400 kW/xmtr 014 plasma - NO RF faulting (of course the power is a mere 800 kW) next shot: raise power by 150 kW/xmtr 015 plasma - D failed to fire because the hi-voltage turned itself off. FPA screen voltage and current were low - occurred without alarm. 016 plasma simultaneous faults 017 plasma phase balance in D 018 plasma phase balance and MIT arc detector 019 plasma phase balance and MIT arc detector 020 plasma clean low power RF RF operates without faults ~450 kW and begins faulting above ~500 kW. The faults are simultaneous on D and E port where D-port had a phase balance fault and E-port had a MIT arc detector fault. next shot: raise power (~100kW)and separate D and E with some overlap 021 plasma no faults during the overlap but D had a phase balance fault and E-port had a PPPL arc detect fault. next shot: raise power (~100kW) 022 plasma clean RF @1.3 MW next shot: complete overlap and raise power (~100 kW) 023 plasma not so clean RF 0.64 D-port MIT arc detector; the remainder are phase balance E-port's single fault is a PPPL arc detector next shot: repeat 024 plasma phase balance and PPPL arc detector 025 plasma E-port is clean D-port has phase balance and both arc detectors signalling Next shot: raise PRF by ~100 kW 026 plasma two faults in FMIT#2 and two on FMIT#1 next shot: raise power to 1 MW 027 plasma faults on both but few 028 plasma faults on both E-port has a PPPL arc detect D-port has phase balance and MIT arc detect next shot: raise power by ~200 kW/xmtr 029 plasma - lousy rf FMIT#1's power feedback performed quite well (maintained power within ~15% of requested for varying loads). Numerous faults continued throughout the run. Vacuum conditioning was performed following the run and it was found that the antennas were essentially unconditioned. This was rather surprising since the previous experience suggests that the vacuum condition could be maintained for weeks of plasma operation. This incident suggests the vacuum condition has become suspect after a few days. It does however offer some hope that the problems with the RF can be solved with further vacuum conditioning. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:00:287PM |
| Author: To Be Determined |
| Physop run summary 990224 EO: Silva/DeKow SL: Wukitch PO: Marmar MP 214 ICRF Development Plan: Start with a fiducial-like .8 MA shot, with an added B_T jog for ECE pedestal measurements during RF. A) Move plasma up 1 to 2 cm for edge Thomson evaluation. B) Scan toroidal field from 5 T to 6 T to move RF resonance. C) Raise I_p to 1 MA. D) Density scans are also possible. E) We will be aiming for reliable simultaneous high power operation of the D and E port systems. This is the main purpose of the run. Engineering Setup: 2 hours ECDC in D_2 before the run, ending at 8:00 am. Power supply settings from 990223021. TF under hybrid control Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled pump B-side upper and leave evacuated Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled fill J-bottom with 2 psi of Kr Hybrid DISABLED We want hydrogen and helium-4 available, for possible use in B-side upper, so the neon bottle should be removed from the system and replaced with hydrogen. Load from 990223021 for segment 1 990219024 for segment 2 (.8 MA, 5.4 T); leave B_T jog for ECE The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV Results: The machine ran reliably today, with 29 consecutive successful startsup. All but 1 shot ran through the ramp-down. There were no changes made to the segment 1 programming during the run. A) was achieved, and data were obtained on the edge Thomson system and the soft x-ray array looking at the pedestal near the top of the plasma. B) and C) were not attempted. D) Target density was scanned from 1e20 to 1.5e20. The bulk of the run was devoted to E). Operation above 2MW was achieved, with trips. See the session leader's summary for details. Some piggybacking with krypton puffing in support of the investigation of high Z screening was also accomplished; krypton was puffed on shots 23 through 28. Measurements were made with the divertor RGA and HIREX. Data for atomic physics investigations of highly charged krypton were also obtained on these shots, with both the McPherson and HIREX. The krypton appeared to prevent access to EDA H-mode at ICRF powers up to 2 MW, with type III ELMs being the norm. The H/D ratio is systematically higher this week than it was immediately after boronization, approaching .08 to .1 on many shots today. ECDC for 5 minutes in D_2 was tried prior to shot 10, which disrupted early. The current rise was slower on shot 10 than it was on other shots. The H/D ratio was lower on shot 11 (~.07) compared to shot 9 (~.09), at the times of maximum stored energy on each shot. The disruption resulted from a vertical position oscillation starting around .3 seconds, which had been happening all day, as well as on the shot we loaded from, 990219024; the plasma did not survive it on shot 10. The oscillation was fixed by ramping RCUR out more quickly in the early part of segment 2, starting on shot 21. ZXL ramp changes, also in the early part of segment 2, reduced the oscillations between shots 11 and 20, but were not as effective as the RCUR change. The plasma was moved up, by about 1 cm relative to our normal ZCUR settings, starting on shot 3. The details of the position ramp were changed from shot to shot, as detailed in the logbook. The vertical position was returned to its nominal value starting with shot 19. Minor ZXL and ZXU tweaks accompanied the ZCUR changes. Dimitri reported seeing signals on many more of the edge Thomson spatial channels (more than 10) for the displaced plasmas. There were some engineering highway camac problems early in the run. They did not recur after the relevant highway driver was toggled off/on. All other engineering systems performed without incident. Scorecard: 29 plasmas 0 fizzles 0 duds 29 total shot cycles |
| Session Leader Comments | |||
| Feb 24 1999 10:12:54:030AM | 990224002 | Steve Wukitch | 002 plasma - H-mode screen overcurrent on #1 #2 fault |
| Feb 24 1999 10:27:51:513AM | 990224003 | Steve Wukitch | 003 plasma - H-mode still have faults |
| Feb 24 1999 10:29:39:937AM | 990224004 | Steve Wukitch | 004 plasma - H-modes #2 fault seems induced by #1 next shot: retune and raise power |
| Feb 24 1999 11:58:04:140AM | 990224010 | Steve Wukitch | between shot 5 minute ECDC in D 010 plasma - early disruption |
| Feb 24 1999 12:29:12:310PM | 990224011 | Steve Wukitch | next shot: turn off Ar to see if EDA remains 011 plasma - RF still faulting |
| Feb 24 1999 12:54:00:060PM | 990224012 | Steve Wukitch | 012 plasma Faults seem to be real events - D phase balance and E arc detector correspond but the traces are going the correct direction. |
| Feb 24 1999 12:54:17:250PM | 990224013 | Steve Wukitch | 013 plasma Same faulting problem - Lower the power to 400 kW/xmtr |
| Feb 24 1999 01:43:40:450PM | 990224014 | Steve Wukitch | 014 plasma - NO RF faulting (of course the power is a mere 800 kW) next shot: raise power by 150 kW/xmtr |
| Feb 24 1999 01:43:59:077PM | 990224015 | Steve Wukitch | 015 plasma - D failed to fire because the hi-voltage turned itself off. FPA screen voltage and current were low - occurred without alarm. |
| Feb 24 1999 01:50:34:467PM | 990224016 | Steve Wukitch | 016 plasma simultaneous faults |
| Feb 24 1999 02:35:44:233PM | 990224017 | Steve Wukitch | 017 plasma phase balance in D |
| Feb 24 1999 02:35:55:590PM | 990224018 | Steve Wukitch | 018 plasma phase balance and MIT arc detector |
| Feb 24 1999 02:36:12:200PM | 990224019 | Steve Wukitch | 019 plasma phase balance and MIT arc detector |
| Feb 24 1999 02:36:28:390PM | 990224020 | Steve Wukitch | 020 plasma clean low power RF next shot: raise power and separate D and E with overlap |
| Feb 24 1999 02:55:56:543PM | 990224021 | Steve Wukitch | 021 plasma no faults during the overlap but D had a phase balance fault and E-port had a PPPL arc detect fault. next shot: raise power (~100kW) |
| Feb 24 1999 03:12:52:640PM | 990224022 | Steve Wukitch | 022 plasma clean RF @1.3 MW next shot: complete overlap and raise power (~100 kW) |
| Feb 24 1999 03:30:02:513PM | 990224023 | Steve Wukitch | 023 plasma not so clean RF 0.64 D-port MIT arc detector; the remainder are phase balance E-port's single fault is a PPPL arc detector next shot: repeat |
| Feb 24 1999 03:55:23:530PM | 990224024 | Steve Wukitch | 024 plasma phase balance and PPPL arc detector |
| Feb 24 1999 03:56:05:373PM | 990224025 | Steve Wukitch | 025 plasma E-port is clean D-port has phase balance and both arc detectors signalling Next shot: raise PRF by ~100 kW |
| Feb 24 1999 04:16:05:857PM | 990224026 | Steve Wukitch | 026 plasma two faults in FMIT#2 and two on FMIT#1 next shot: raise power to 1 MW |
| Feb 24 1999 04:39:37:420PM | 990224027 | Steve Wukitch | 027 plasma faults on both but few |
| Feb 24 1999 04:50:38:420PM | 990224028 | Steve Wukitch | 028 plasma faults on both E-port has a PPPL arc detect D-port has phase balance and MIT arc detect next shot: raise power by ~200 kW/xmtr |
| Physics Operator Comments | |||
| Feb 24 1999 08:33:03:873AM | Earl Marmar | MP214 ICRF Development Coldstart Hybrid no errors all matrices respond load from 990223021 for segment 1 990219024 for segment 2 Argon pulse to 30 msec | |
| Feb 24 1999 09:22:55:483AM | 990224001 | Earl Marmar | Plasma; current rise has slight hesitation, but looks ok 1.6 MW RF; H-modes; some trips Dithering between EDA and ELMfree |
| Feb 24 1999 09:48:43:263AM | 990224002 | Earl Marmar | no PCS changes plasma 2 MW RF and then tripping 1 H-Mode, semi-EDA-ish |
| Feb 24 1999 10:01:34:810AM | 990224003 | Earl Marmar | Move plasma gradually up during shot, total excursion 1 cm raise ZXU ~1 cm raise ZXL gradually, also 1 cm by 1.2 s plasma moved up a few mm |
| Feb 24 1999 10:30:58:043AM | 990224004 | Earl Marmar | Move ZXL up a little more move ZCUR up a little more plasma |
| Feb 24 1999 10:39:39:840AM | 990224005 | Earl Marmar | no PCS changes plasma |
| Feb 24 1999 10:57:18:687AM | 990224006 | Earl Marmar | No PCS changes plasma |
| Feb 24 1999 11:10:22:623AM | 990224007 | Earl Marmar | raise nl_04 to 1.1e20 plasma |
| Feb 24 1999 11:28:16:217AM | 990224008 | Earl Marmar | raise nl_04 to 1.2e20 increase voltage on PG_3 in seg 1 between 70 and 100 ms plasma |
| Feb 24 1999 11:44:25:090AM | 990224009 | Earl Marmar | no PCS changes plasma |
| Feb 24 1999 12:02:21:840PM | 990224010 | Earl Marmar | ECDC 4.5 minutes in D_2 before the shot disable argon puff disrupt early (.35 s) plasmas have been vertically oscillating at this time all day; this time we lost it. |
| Feb 24 1999 12:17:46:187PM | 990224011 | Earl Marmar | Pull ZXL down more gently between .1 and .4 sec, and not quite so far plasma still wobbling vertically around .3 s elongation was slightly reduced before cross-over |
| Feb 24 1999 12:34:18:577PM | 990224012 | Earl Marmar | bring ZXL up a little more before 0.4 s argon back on plasma vertical oscillation at 0.3 s reduced |
| Feb 24 1999 12:51:01:060PM | 990224013 | Earl Marmar | move B_T jog 100 ms earlier plasma |
| Feb 24 1999 01:08:23:513PM | 990224014 | Earl Marmar | ramp ZCUR up sooner (to reach max at 0.8 s) plasma got the faster vertical ramp |
| Feb 24 1999 01:37:37:670PM | 990224014 | Earl Marmar | change B_T sweep to come back after the excursion to 150kA until 1.2 s Plasma |
| Feb 24 1999 01:37:58:857PM | 990224015 | Earl Marmar | no changes plasma |
| Feb 24 1999 01:38:09:857PM | 990224016 | Earl Marmar | no changes plasma |
| Feb 24 1999 01:52:41:640PM | 990224017 | Earl Marmar | raise nl_04 to 1.3e20; add volts to PG3 programming in segment 2 plasma got the density we asked for |
| Feb 24 1999 02:07:41:967PM | 990224018 | Earl Marmar | nl_04 to 1.5e20 plasma; no RF |
| Feb 24 1999 02:35:11:043PM | 990224019 | Earl Marmar | eliminate vertical position shift nl_04 to 1.1e20; reduce volts on PF3 preprog in seg 2 plasma |
| Feb 24 1999 02:35:25:687PM | 990224020 | Earl Marmar | no PCS changes plasma |
| Feb 24 1999 02:55:39:390PM | 990224021 | Earl Marmar | Move RCUR out a little sooner; try to keep minor radius more constant around .3 to .4 seconds plasma RCUR tweak seemed to help; vertical lurching was reduced. |
| Feb 24 1999 03:09:50:763PM | 990224022 | Earl Marmar | no PCS changes plasma |
| Feb 24 1999 03:22:37:140PM | 990224023 | Earl Marmar | disable argon enable krypton, 15 msec puff starting at 0.4 seconds plasma |
| Feb 24 1999 03:52:52:543PM | 990224024 | Earl Marmar | increase Kr puff length to 25 msec from 15 msec plasma |
| Feb 24 1999 03:53:16:153PM | 990224024 | Earl Marmar | no PCS changes plasma |
| Feb 24 1999 04:06:25:793PM | 990224025 | Earl Marmar | no pcs changes plasma |
| Feb 24 1999 04:17:38:123PM | 990224026 | Earl Marmar | no PCS changes plasma |
| Feb 24 1999 04:32:16:920PM | 990224027 | Earl Marmar | no PCS changes plasma |
| Feb 24 1999 04:47:24:340PM | 990224028 | Earl Marmar | reduce krypton puff by 5 msec (to 20 msec) plasma |
| Feb 24 1999 05:08:24:373PM | 990224029 | Earl Marmar | Krypton off Argon on, 25 msec starting at 0.375 nl_04 to 1.25e20 plasma |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:12:37:590AM | Plasma | Ok | 0915 no faults/plasma |
| 2 | 09:37:26:687AM | Plasma | Ok | no faults/plasma |
| 3 | 09:51:17:390AM | Plasma | Ok | no faults/plasma |
| 4 | 10:12:51:840AM | Plasma | Ok | no faults/plasma |
| 5 | 10:29:33:187AM | Plasma | Ok | no faults/plasma |
| 6 | 10:45:24:623AM | Plasma | Ok | no faults/plasma |
| 7 | 11:02:04:750AM | Plasma | Ok | no faults/plasma |
| 8 | 11:15:27:153AM | Plasma | Ok | no faults/plasma |
| 9 | 11:32:20:653AM | Plasma | Ok | no faults/plasma |
| 10 | 11:49:12:763AM | Plasma | Ok | no faults/plasma disruption |
| 11 | 12:07:40:513PM | Plasma | Ok | no faults/plasma |
| 12 | 12:21:50:920PM | Plasma | Ok | no faults/plasma |
| 13 | 12:42:28:140PM | Plasma | Ok | no faults/plasma |
| 14 | 12:56:28:560PM | Plasma | Ok | no faults/plasma |
| 15 | 01:10:36:873PM | Plasma | Ok | no faults/plasma |
| 16 | 01:25:41:420PM | Plasma | Ok | no faults/plasma |
| 17 | 01:41:23:390PM | Plasma | Ok | no faults/plasma |
| 18 | 01:59:15:903PM | Plasma | Ok | No Faults / Plasma |
| 19 | 02:13:54:623PM | Plasma | Ok | No Faults / Plasma |
| 20 | 02:32:44:030PM | Plasma | Ok | No Faults |
| 21 | 02:45:51:437PM | Plasma | Ok | No Faults / Plasma |
| 22 | 03:02:45:217PM | Plasma | Ok | No Faults / Plasma |
| 23 | 03:17:42:840PM | Plasma | Ok | No Faults / Plasma |
| 24 | 03:31:40:077PM | Plasma | Ok | No Faults / Plasma |
| 25 | 03:48:22:983PM | Plasma | Ok | No Faults / Plasma |
| 26 | 04:07:25:293PM | Plasma | Ok | No Faults / Plasma |
| 27 | 04:21:25:640PM | Plasma | Ok | No Faults / Plasma |
| 28 | 04:40:13:513PM | Plasma | Ok | No Faults / Plasma |
| 29 | 04:54:24:653PM | Plasma | Ok | No Faults / Plasma |