| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Earl Marmar,Jerry Hughes |
| Physics operator(s): | Ron Parker,Jim Irby,Ron Parker |
| Engineering operator(s): | Gary Dekow,Sam Pierson,Bill Parkin |
| Engineering Operator Run Comment |
| MP430 Localization of Effects of Boronization; SL: Marmar; PO: Parker; E |
| Session Leader Plans |
| Entered: Aug 22 2005 09:44:34:713AM |
| Author: Earl Marmar |
| Session leader plan for 1050822
MP430 Localization of Effects of Boronization Over the weekend: ECDC in D2 (P = 2e-4 gauge), bake at 60 C On Monday morning, prior to the start of the run: Boronize for 1 hour ECDC scan from 44 to 103 cm, dwell at 70 cm 100% duty factor on magnetron (no flashing) Standard pressures, using 20% B2D6 / 80% He bottle (from GA) followed by 1 hour ECDC in Helium, ending by 8:30 [Note: because of a magenetron problem, we decided not to do the post-boronization He ECDC] Be set up for between-shot boronization during the run ICRF: E and J-4 will be needed Shot plan: Start from a shot like 1050818025 (1 MA, LSN, 1 cm outer gap) 1) Take ~3 shots to evaluate where we are with the 1 hour boronization and get the RF set. If we are still having problems with injections perhaps we should try changing the outer gap. [45 minutes] 2) 2 boronizations - 25 cm 20 minute scans (80-105, 62-87), pause at center [1.5-2 hours] 3) 10 cm, 10 minute scans working in from centers at 90 (90, 85, 80, 75, 70, 65, 55) [3.5 hours if no fizzles] 4) adjust the boronization pressure down [time permitting] All boronizations will be done with 100% magnetron duty factor. |
| Physics Operators Plans |
| Entered: Aug 20 2005 08:25:29:030AM |
| Author: Ron Parker |
| CORRECTED Engineering Setup and Run Plan for 1050822
MP 430 Localization of the Effects of Boronization (Cont'd) Session Leader: E. Marmar Physics Operator: R. Parker Weekend bake at 60 C and ECDC in Deuterium, p=2e-4 Gauge Boronization from 6:30 to 7:30 followed by 1 hour of He discharge cleaning beginning at 7:45 and ending at 8:45 Parameters for boronization: Scan 44/70/103 cm, Normal pressures, using the GA diborane bottle (20% B2D6 / 80% He) 100% duty cycle on magnetron (not pulsed) Setup for between shot boronization Run Begins at 9:00 and ends at 5:00 Power Systems as on 1050818025 RF in run on by 6:15 (E and J-4 sources) A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled. Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar plus 1 psi neon Hybrid DISABLED (PG1) leave B-side upper as is He3 Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) Enable the following gate valves and shutters: ECE, VUV, Z-bolo shutters |
| Session Leader Summaries |
| Entered: Aug 22 2005 06:21:23:197PM |
| Author: Jerry Hughes |
| Shots 15--22: Made initial steps on MP433. Injections limited most discharge attempts, particularly when RF power (or its ramp rate) was highest. Reducing the demands on the RF improved things, and shots 20 and 22 had long H-modes. NINJA puffs with 10psi and 20psi D2 were created on shots 21 and 22, producing in both cases a slight rise in overall density (though not in the edge pedestal) and appearing to stabilize the growth of radiated power somewhat. 10 minutes of boronization was applied before most shots; the beneficial effects of this technique seemed to wear off about 200ms into most H-modes. Will proceed tomorrow, after a somewhat longer evening boronization. |
| Entered: Aug 23 2005 04:09:03:837PM |
| Author: Earl Marmar |
| Summary for first part of 1050822
MP 430 Boronization localization Session Leaders: E. Marmar/B. Lipschultz We got off to a slightly slow start as the 1 hour pre-run boronization did not start until 8:20 am. Because of this, we decided to eliminate the post boronization He ECDC and go straight to plasmas. The 1 hour boronization gave decent conditions. Shot 3 and 5 were the first 2 plasmas, and injections were causing some problems. Shot 5 had a fairly steady h-mode. Shot 6 disrupted early in h-mode. By shot 9, which followed 2 early disruptions (prior to RF turnon), the boronization was largely worn off. We accomplished part 2 of the plan: boronizations with 25 cm scans in overlapping regions (shots 10 and 12). The early h-mode in shot 12 (62/74/87) was slightly better than that in shot 10 (80/90/105); shot 10 also disrupted before 1 second. Next we did 2 of the planned 10 minutes scans: (75/80/85) before shot 14 and (65/70/75) before shot 15/16. Shot 14 was steadier than 16, with the latter getting slowed by an injection early in the first h-mode. After shot 16, it was decided to switch to MP433 "Fueling in H-modes as a function of pedestal density" (J. Hughes, session leader). This MP will continue to use between-shot boronization. shot scan (min/dwell/max) Scan time H89 (peak) 3 44/70/103 60 1.39 5 none 1.74 6 none 1.34 9 none 1.27 10 80/90/105 20 1.67 11 none 1.39 12 62/74/87 20 1.79 13 none 1.43 14 75/80/85 10 1.59 16 65/70/75 10 1.63 |
| Physics Operator Summaries |
| Entered: Aug 22 2005 05:45:14:023PM |
| Author: Ron Parker |
| The run started late due to failure of the ECDC magnetron. This also voided the ECDC that had been planned after boronization.
The initial shots were a dud, a fizzle and an early disruption. This was followed by a dud due to a failure of the pulse gas PLC. Fianlly, shot 5 resulted in a full length plasma, reaching 175 kJ and peak neutron rate of 6e13. The next few shots disrupted early, and then things began to settle down at shot 11; nevertheless there were two fizzles and one disruption in the sequence that ended with shot 22. These shots featured between shot boronization, usually for 10 minutes; typically, the first shot after boronization had decent stored energy and neutron emission, the next had lower performance, indicating that the improvement due to between shot boronization is temporary, lasting for less than the full RF duration in one shot. (pulse gas prefill was 8 ms duration for the first shot after boronization, and 18 ms for the next shot.) Scorecard: 22 shots, 11 full length, 6 disruptions, 2 duds and 3 fizzles. |
| Session Leader Comments | |||
| Aug 22 2005 09:55:28:633AM | 1050822001 | Earl Marmar | prior to this shot,
1 hour ECDC boronization scan 44/70/103 20%B2D6/80%He 100% duty factor (no flashing) Because of problem with the magnetron, got a slightly late start, and we decided to forego the post boronization ECDC in He Went into init at P=3.8e-6 gauge dud |
| Aug 22 2005 09:55:06:667AM | 1050822002 | Earl Marmar | try again
fizzle |
| Aug 22 2005 10:29:10:510AM | 1050822003 | Earl Marmar | plasma
H-mode, 145 kJ, H89 ~ 1.4 and steady Prf = 2.8 MW until 0.88 sec, big increase in Prad, followed by disruption |
| Aug 22 2005 10:50:49:400AM | 1050822005 | Earl Marmar | plasma
good shot lumpy current rise a few RF trips early in H-mode, then settles to fairly steady H89 ~ 1.6 to 1.7, Prf ~ 2.8 MW, Wtot ~ 170 kJ total neutrons (.7 < t <1.5) = 1.99e13 |
| Aug 22 2005 10:52:03:680AM | 1050822006 | Earl Marmar | plasma
h-mode, Prad high from 0.85 s, then disrupt |
| Aug 22 2005 11:06:07:230AM | 1050822007 | Earl Marmar | move strike point higher on the outer divertor
early disruption (before the rf) |
| Aug 22 2005 11:54:39:493AM | 1050822009 | Earl Marmar | plasma
multiple h-modes some RF trips H89 ~ 1.3 total neuts = 8.4e12 (.7 < t < 1.5) |
| Aug 22 2005 12:51:05:917PM | 1050822010 | Earl Marmar | Plan 2(a) from the run plan
prior to this shot, ECDC boronize 20 minutes scan 80/90/105 100% duty factor go to init at P~4e-6 gauge plasma H-mode, heading up, H89 ~ 1.67, then Prad increase and disruption |
| Aug 22 2005 12:48:41:120PM | 1050822011 | Earl Marmar | no additional boronization prior to this shot
slow the RF power ramp-up plasma 2 H-modes, first ended by injection H89 ~ 1.4 |
| Aug 22 2005 01:30:56:557PM | 1050822012 | Earl Marmar | 2(b) from the run plan
prior to this shot, ECDC boronize 20 minutes scan 62/74/87 100% duty factor go to init at P~4e-6 gauge plasma H-mode H89 ~ 1.8, falling slowly until 1.4 seconds, then Prad increases above 1 MW (2*prad_2pi) total neutrons = 1.65e13 (.7 |
| Aug 22 2005 01:29:03:417PM | 1050822013 | Earl Marmar | no additional boronization prior to this shot
plasma steady H-mode Prad is higher H89 ~ 1.4 early, then falling total neutrons = 7.4e12 |
| Aug 22 2005 01:55:45:040PM | 1050822014 | Earl Marmar | prior to this shot
ECDC boronization for 10 minutes 75/80/85 100% duty factor plasma steady h-mode h89 ~ 1.6 and then slowly dropping total neutrons = 1.33e13 |
| Aug 22 2005 02:46:55:980PM | 1050822015 | Earl Marmar | prior to this shot, ECDC boronize for 10 minutes
scan 65/70/75 100% duty factor fizzle |
| Aug 22 2005 02:59:48:980PM | 1050822015 | Jerry Hughes | Attempt to repeat shot 14 with longer RF flattop. No plasma. Next shot: Retry. - |
| Aug 22 2005 02:57:43:180PM | 1050822016 | Earl Marmar | no additional boronization following shot 15 fizzle
plasma first h-mode h89 ~ 1.6, then injection second h-mode h89 ~ 1.15 total neutrons = 7.9e12 |
| Aug 22 2005 02:59:05:307PM | 1050822016 | Jerry Hughes | Discharge was satisfactory, but a big injection kills the H-mode at 0.96s. 2nd H-mode is a good target for puff. Need to try for a steady H-mode of ~0.5s length. Next shot: Retry shot. Lower slope of RF ramp, based on the premise that this reduces the likelihood of injections. |
| Aug 22 2005 03:21:46:930PM | 1050822017 | Jerry Hughes | Injection, followed by disruption, with RF at full power. Next shot: Lower total RF to 2.3MW |
| Aug 22 2005 03:26:37:133PM | 1050822018 | Jerry Hughes | Prad fraction is high, multiple H-modes. YAGs failed. Next shot: Boronize and repeat shot. |
| Aug 22 2005 04:35:48:337PM | 1050822020 | Jerry Hughes | long H-mode, as desired. Prad hits steady state at about 1.25s, then H-mode deteriorates. May have to be satisfied with this. Next shot: Repeat, with NINJA puff, 10psi, 1.2--1.5s |
| Aug 22 2005 04:56:48:490PM | 1050822021 | Jerry Hughes | Injection hits just before NINJA puff. Some rise on TCI, core n_e. Next shot: Repeat, with NINJA puff, 20psi, 1.2--1.5s |
| Aug 22 2005 05:36:39:570PM | 1050822022 | Jerry Hughes | Shot goes well. Confinement in H-mode begins to degrade prior to NINJA puff at 1.2s. Density increase on TCI, central n_e. Edge Te, Prad appear suppressed by puff. End of run. Will continue tomorrow after a small overnight boronization. |
| Physics Operator Comments | |||
| Aug 22 2005 05:48:12:883PM | Ron Parker | Shot 22 ran well, but similar sagging of both stored energy and neutron emission. | |
| Aug 22 2005 08:54:39:730AM | 1050822001 | Ron Parker | The magnetron used for ECDC failed this morning and had to be replaced by the spare. This has caused a delay, estimated to be 2 hours if no change in the setup.
Instead, we'll forego the ECDC in He. Boronization began at 8:20. Assuming 1 hour of boronization, the first shot should be run at ~ 9:30. |
| Aug 22 2005 09:51:19:680AM | 1050822001 | Ron Parker | First shot was a dud. Possible problems: fill pressure too low (~2.7e-4) and/or
Bz too negative (-.001 @ 5 ms). Next: Double fill gas (from 8 to 16 ms) and increase IC_EF4U from -1310 to -1290. |
| Aug 22 2005 09:57:34:730AM | 1050822002 | Ron Parker | Shot 2 was a fizzle -- current rise a bit fast.
Next: Increase fill pulse to 21 ms to slow current rise, reduce IC_EF4U by 10 A to -1300 (Bz was slightly too positive.) |
| Aug 22 2005 10:15:49:307AM | 1050822003 | Ron Parker | Shot 3 started up reasonably well, but disrupted at 0.9 s.
Meanwhile, a power room entry alarm went off shortly after shot indicating entry from RF lab. However, door was securely locked and entry was not possible. The conclusion is that this was a false indication. Next: no change, try again. |
| Aug 22 2005 10:26:02:323AM | 1050822004 | Ron Parker | Shot 4 was a dud -- no gas. Gas was setup properly so the PLC must have
failed to operate. Try again with same setup. |
| Aug 22 2005 10:43:51:587AM | 1050822005 | Ron Parker | Shot 5 was a full shot, although the current rise was ugly. Nevertheless,
stored energy reached 175 kJ and neutron rate reached 6e13/s. Suggestion is to delay density rise by ~100 ms for shot 6. |
| Aug 22 2005 10:50:27:180AM | 1050822006 | Ron Parker | Current rise was improved on this shot, but it disrupted at ~ 1s
We'll move the strike point up for next shot by increasing ZXL by 1 cm. |
| Aug 22 2005 11:02:07:557AM | 1050822007 | Ron Parker | Shot 7 disrupted early.
Jim Irby taking over as PO. |
| Aug 22 2005 11:32:23:010AM | 1050822008 | Jim Irby | ZXL to -.01 m at 0.55 s then ramp to 0.0 m at 0.75 s
early disruption |
| Aug 22 2005 11:31:52:337AM | 1050822009 | Jim Irby | reloaded shot 1050822006
increased early Ip rise to 750kA at 0.2 s plasma into rampdown --- Prad up and neuts down from shot 005 will boronize for 20 minutes before next shot |
| Aug 22 2005 12:15:40:603PM | 1050822010 | Jim Irby | prefill from 21 to 8 ms
plasma for 0.95 s until injection killed us |
| Aug 22 2005 12:39:20:057PM | 1050822011 | Jim Irby | prefill to 18 ms from 8 ms
plasma into rampdown |
| Aug 22 2005 12:46:19:917PM | 1050822011 | Ron Parker | Shot ran well with full ramp down.
Next: Boronize for 20 minutes before next shot. 8 ms prepuff. |
| Aug 22 2005 01:13:22:823PM | 1050822012 | Ron Parker | Shot 12 ran well, 175 kJ, 6e13 neutrons, But radiated power still comes up at ~ 1.2 sec. Next: Repeat, increase gas to 18 ms. |
| Aug 22 2005 01:35:43:447PM | 1050822013 | Ron Parker | Shot 13 ran well, with degradation in stored energy and neutrons relative to shot 12. Next: Boronize for 10 minutes, repeat shot. Prefill set at 8 ms. |
| Aug 22 2005 02:00:10:510PM | 1050822014 | Ron Parker | Shot 14 ran well, full length. Neutrons reached 4e13, W ~ 160 kJ.
Next: Boronize for 10 minutes, 65, 70, 75. Jerry Hughes becomes SL -- MP433. Same shot. |
| Aug 22 2005 02:23:07:667PM | 1050822015 | Ron Parker | Shot 15 fizzled. Try again. Increase prefill to 18 ms. |
| Aug 22 2005 02:59:06:963PM | 1050822016 | Ron Parker | Shot 16 ran, poor quality H_mode -- W ~ 110-120 kJ, neutrons ~ 1e13 in second H mode. Next: 10 minute boronization, same settings as last one (65/70/75). |
| Aug 22 2005 03:07:55:430PM | 1050822017 | Ron Parker | Shot 17 ran, but disrupted at 1.1 sec. Repeat with slightly less RF (2.3 vs. 2.8) |
| Aug 22 2005 03:25:58:713PM | 1050822018 | Ron Parker | Shot ran full length, but H-mode is poor quality.
Next: Boronize, 10 minutes, retry. |
| Aug 22 2005 03:51:27:870PM | 1050822019 | Ron Parker | Shot 19 fizzled. Repeat, gas back to 18 ms prefill. |
| Aug 22 2005 04:09:02:430PM | 1050822020 | Ron Parker | Shot 20 went off, some injections, sagging W and neutrons.
Next: Boronize, then puff gas into shot. |
| Aug 22 2005 04:54:48:223PM | 1050822021 | Ron Parker | Shot 21 ran full length, and gas from Ninja was injected.
Next: Boronize again, and increase the Ninja puff. This will be the last shot. |
| Aug 22 2005 05:48:32:307PM | 1050822022 | Ron Parker | Shot 22 ran well, but similar sagging of both stored energy and neutron emission. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:36:30:103AM | Plasma | Ok | |
| 2 | 09:49:11:743AM | Plasma | Ok | |
| 3 | 10:02:49:917AM | Plasma | Ok | |
| 4 | 10:17:11:650AM | Plasma | Ok | |
| 5 | 10:30:15:540AM | Plasma | Ok | |
| 6 | 10:42:42:197AM | Plasma | Ok | |
| 7 | 10:55:02:133AM | Plasma | Ok | |
| 8 | 11:10:05:650AM | Plasma | Ok | |
| 9 | 11:24:26:010AM | Plasma | Ok | |
| 10 | 12:09:36:370PM | Plasma | Ok | |
| 11 | 12:21:55:680PM | Plasma | Ok | |
| 12 | 01:02:42:383PM | Plasma | Ok | |
| 13 | 01:15:34:790PM | Plasma | Ok | |
| 14 | 01:45:32:680PM | Plasma | Ok | |
| 15 | 02:17:23:447PM | Plasma | Ok | |
| 16 | 02:30:00:167PM | Plasma | Ok | |
| 17 | 03:02:15:680PM | Plasma | Ok | |
| 18 | 03:15:03:150PM | Plasma | Ok | |
| 19 | 03:45:51:947PM | Plasma | Ok | |
| 20 | 03:58:24:133PM | Plasma | Ok | |
| 21 | 04:34:44:900PM | Plasma | Ok | |
| 22 | 05:06:30:150PM | Plasma | Ok | |