| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Steve Wolfe |
| Physics operator(s): | Dmitri Mossessian |
| Engineering operator(s): | Frank Silva,Gary Dekow |
| Engineering Operator Run Comment |
| mp#206 post borinization |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:19:150PM |
| Author: To Be Determined |
| Session Leader's Summary for Wed. 990217 MP#206 Resume Operation (part 4 - post-boronization) SL: wolfe PO: Mossessian EO: Silva/Dekow We boronized the machine last friday evening (2/12/99): . TC6 was 112 to 115 mT, TC3 was typically 3.4 mT . approx 1900 angstroms deposition, 130 psi change in diborane bottle pressure, at approx 10 psi/hour . r_max=96 cm We have had approx 38 hours of ECDC in helium at 5e-5 torr over the weekend We have had 2 hours of ECDC in D2 at 1e-4 torr just before the run Run Plan: -------- Goal- Assess readiness to proceed with physics campaign, based on H-mode plasmas with up to 3MW of source power. Plan: First, run a "Tuesday" OH test Run 800kA, nl4=1e20 discharge, similar to 990212015. RF should try for three power steps: 1.1MW,2.2MW, max available. Based on past experience, startup may be problematic for the early part of the first run after boronization. We'll keep at it until we get good shots. We will be monitoring: H/D ratio Prad (2pi) Zeff (Z_ave) Midplane & Divertor pressure in addition to looking for heating and H-modes. If the RF is working and the boronization went properly, we should end up with EDA H-modes, possibly even at the low-power step (see e.g. 980220003). However, it may take a number of discharges to get to this condition. We may also need to tweak the gaps, etc., to help the ICRF coupling. The RF loading feedback circuit will probably not be available; we didn't need it for plasmas of this level last year. Success in achieving EDA h-modes is necessary before we can declare the machine ready for physics operation. Therefore, this will be our primary objective. If EDA is obtained at 0.8MA, we will increase the current to 1MA. If things are really going well, we may get an early start on Spencer's MP 230 (flapping at EDA). If things are going badly, we may need to consider a new boronization. Results: ---------- Not terrible, considering, but we did not accomplish the primary goal. We got off to a late start (10AM) because of an oil pump problem in the alternator. We started with a Tuesday test, and test shots for EF3 and EF4 which had been worked on since the last run. We then had a long delay chasing down a Comm. bank charging problem on EF1L (or maybe EF1U). This was eventually traced to a faulty AFOL board. First plasma attempt (shot 9) was at about 12:40PM. It fizzled because of a very negative Br. The next shot was successful, after a 2mT Br tweak. We then got into a series of alternating shots and fizzles. H-modes were obtained routinely, but there were numerous problems keeping the RF on. All the cleanliness signs were good. H/D was in the .02 to .06 range on the Marmar-meter, Z_ave was between 1.2 and 1.5, CII breakdown peak was around .004mW/cm2/ster, Prad_2pi was typically less than 500kW; moreover the H-mode threshold was around 900kW to 1MW. H-factors are a bit on the low side, around 1.5. Argon was turned on after shot 19. There was no obvious degradation in performance. All the successful shots had h-modes and ran essentially full length. Good shots to look at were #17, 19, 21 and #25. Shot 19 is nearly steady state, but does not appear to be EDA. The pedestal width is 2mm and the Halpha is low; it may have small type III ELMs. The oouter strike point was on the floor until about .9sec all day until shot 25, when we moved the x-point up 1cm at .44sec. It should probably be moved out about 1cm as well to get the strike firmly on the outer plate. The RF problems appeared to be much more serious today than last week. Even the E-port antenna was unable to put out more than about 1.2MW without faulting, and Steve indicated that the arc indications were real. Trying to run the two antennas together was generally unsuccessful today. In my opinion, getting the RF running more reliably at high power is the main problem now. If we had set it up ahead of time, we would have tried between-shot ECDC (in Helium) to fix the fizzles. This should be tried tomorrow if the alternating sequence returns. The midplane pressure was perhaps a little low for EDA at about .25mTorr (around 30mTorr in the divertor). A slightly higher target density may do better, if we can get more power in. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:00:240PM |
| Author: To Be Determined |
| Physics operator summary for 990217 EO: Silva SL: Wolfe PO: Mossessian Run 990217 was in support of Mini Proposal 206 part 4 - POst Boronization Evaluation. An alternator problem delayed the start of the run to 10 am, then various supply tests and problems delayed it even further and the first plasma attempt was made only at 12:30 on shot 9. The first four shots were OH, EF3 and EF4 tests. On shot 5 a problem with EF1 commutation bank power supply was discovered and shots 6-8 were test shots in attempts to locate and fix the problem. Little tweak of Br at startup resulted in good plasma on shot 10. A plasma/fizzle sequence then followed for 12 shots. No attempts were made to tweak anything in PCS since plazma or fizzle production seems to depend only on base pressure. Bz tweaks on shots 21-24 were made to try to obtain two plasmas in a row but resulted in four fizzles in a row. Scorecard: 25 shots, 7 tests, 8 plasmas, 10 fizzles Shot summary for Run 990217: Shot: 1 OH test 2 EF3 test 3 EF4 test 4 EF4 test 5 plasma attempt, EF1 fault 6 EF1 test 7 EF1 test 8 EF1 test 9 Fizzle 10 Plasma, H modes, Br tweak 11 Fizzle 12 Plasma, H-modes 13 Fizzle 14 Plasma, H-modes, Bz tweak 15 Fizzle 16 Plasma, H-modes 17 Plasma, waited longer for base pressure to come down 18 Fizzle 19 Plasma, H-modes 20 Fizzle 21 Plasma, H-modes 22 Fizzle, ZXL and Bz tweaks 23 Fizzle, Bz tweak 24 Fizzle, Bz tweak 25 Plasma, H-modes, Bz tweak |
| Session Leader Comments | |||
| Feb 17 1999 07:41:22:560AM | Steve Wolfe | MP#206 (part 4) Post-boronization evaluation Goal- Assess readiness to proceed with physics campaign, based on H-mode plasmas with up to 3MW of source power. Plan: First, run a "Tuesday" OH test Run 800kA, nl4=1e20 discharge, similar to 990212015. RF should try for three power steps: 1.1MW,2.2MW, max available. Based on past experience, startup may be problematic for the early part of the first run after boronization. We'll keep at it until we get good shots. We will be monitoring: H/D ratio Prad (2pi) Zeff (Z_ave) Midplane & Divertor pressure in addition to looking for heating and H-modes. If the RF is working and the boronization went properly, we should end up with EDA H-modes, possibly even at the low-power step (see e.g. 980220003). However, it may take a number of discharges to get to this condition. We may also need to tweak the gaps, etc., to help the ICRF coupling. The RF loading feedback circuit will probably not be available; we didn't need it for plasmas of this level last year. Success in achieving EDA h-modes is necessary before we can declare the machine ready for physics operation. Therefore, this will be our primary objective. If EDA is obtained at 0.8MA, we will increase the current to 1MA. If things are really going well, we may get an early start on Spencer's MP 230 (flapping at EDA). If things are going badly, we may need to consider a new boronization. | |
| Feb 17 1999 07:42:16:030AM | Steve Wolfe | Due to an alternator delay, today's run will start around 10AM. | |
| Feb 17 1999 09:56:54:483AM | 990217001 | Steve Wolfe | Shot 1- Tuesday test. looks ok. Next shot will be either EF3 or EF4 test |
| Feb 17 1999 10:07:03:700AM | 990217002 | Steve Wolfe | Shot 2: EF3 test. Engineers replaced the overvoltage circuit on Monday. 6kA looks ok. Next test EF4. |
| Feb 17 1999 10:13:35:170AM | 990217003 | Steve Wolfe | Shot 3: EF4 test. Not ok. It wasn't enabled! |
| Feb 17 1999 10:19:56:357AM | 990217004 | Steve Wolfe | Shot 4: Try again. looks ok. Next shot, try for plasma. |
| Feb 17 1999 10:33:08:500AM | 990217005 | Steve Wolfe | Shot 5: First plasma attempt. Problem in CHECK. Went back to recool. EF1L comm bank didn't charge. Have to check the supply. |
| Feb 17 1999 10:44:43:420AM | 990217005 | Steve Wolfe | Shot 5: Supply was on. Try running through a sequence to re-synch the system after the backout; see if the bank charges. Bank still not charging. |
| Feb 17 1999 11:40:09:530AM | 990217006 | Steve Wolfe | Shot 6: another test - still no charge indication. Apparently it's a bad AFOL. |
| Feb 17 1999 11:55:07:450AM | 990217007 | Steve Wolfe | Shot 7: Swapped AFOL board. Another test shot. Still no charging indication. |
| Feb 17 1999 12:24:10:530PM | 990217008 | Steve Wolfe | Shot 8: Another test. This one works. |
| Feb 17 1999 12:43:41:077PM | 990217010 | Steve Wolfe | Shot 9: Set up for a full shot. fizzle. CII=.004. Big negative Br. bd at 6.5msec |
| Feb 17 1999 12:58:11:403PM | 990217010 | Steve Wolfe | Shot 10: Tweak Br by 2mT more positive. plasma, with H-modes. 1.64sec bd at 5.4msec, Br still a little negatve, First H-mode at 1MW level. H/D=.04-.06 during the RF. |
| Feb 17 1999 01:12:46:123PM | 990217011 | Steve Wolfe | Shot 11: Rf trying to tune to stay on in the H-modes. No PCS changes. fizzle. bd at 5.1msec, br still a little negative, Bz maybe a little negative. Gas at .065mTorr (18msec). MFLUx doesn't look bad. It's probably just boronization. |
| Feb 17 1999 01:29:00:187PM | 990217012 | Steve Wolfe | Shot 12: plasma 3 or 4 h-modes, lower RF power (max around 1.15MW) |
| Feb 17 1999 01:36:32:763PM | 990217013 | Steve Wolfe | Shot 13: fizzle. bz looks a little negative again. Its changing shot to shot. Go 10A more positive on ICEF4 (just for luck). |
| Feb 17 1999 01:58:54:233PM | 990217014 | Steve Wolfe | Shot 14: Small tweak on Bz (EF4) ; plasma 2 h-modes, low power< 1MW Strike point ios on the floor until .9sec; leave it for now. H/D=0.02 until .9sec, then .05 Compression ratio is arount 100. Zave is between 1 and 1.5; |
| Feb 17 1999 02:04:42:700PM | 990217015 | Steve Wolfe | Shot 15: Wait 15 minutes to let pressure come down; cooling was ready at 12min. base=1.0e-6, M32=3.8e-8 (compare 7e-7,1.9e-8 on shot 14). fizzle. Have to wait longer? |
| Feb 17 1999 02:40:55:967PM | 990217016 | Steve Wolfe | Shot 16: No changes. base=7e-7,M32=1.8e-8 plasma. RF is all chopped up, peak values >3.5MW 4 h-modes, first one about 300msec H/D up to .06 by the end of this one. |
| Feb 17 1999 03:04:32:750PM | 990217017 | Steve Wolfe | Shot 17: wait a long time after previous shot, 21 minutes, base=8.3e-7,M32=3.2e-8 plasma. D-port on, but faulting from 0.5 to 1sec, E-port on clean from 1sec to 1.2; was supposed to be the other way around. H/D < .06 . WMHD gets to just over 100kJ (.82sec). |
| Feb 17 1999 03:11:10:733PM | 990217018 | Steve Wolfe | Shot 18: This time, swap D and E in time sequence. fizzle. should've waited a little longer. |
| Feb 17 1999 03:41:52:293PM | 990217019 | Steve Wolfe | Shot 19: Go again. plasma one nice long h-mode, power between .9 and 1.2MW, 90kJ More or less steady state, but it looks like Elm-free. Next shot Argon |
| Feb 17 1999 03:52:20:217PM | 990217020 | Steve Wolfe | Shot 20:Same as 19, but with argon. fizzle. |
| Feb 17 1999 04:09:53:857PM | 990217021 | Steve Wolfe | Shot 21:plasma shorter H-modes. 2pi still low. some injections. Next shot, move X-point height up earlier in shot to try to get it off the floor. Also a small Bz tweak . |
| Feb 17 1999 04:19:32:467PM | 990217022 | Steve Wolfe | Shot 22: Steve says he has to back off the E-port power because he is getting a "series arc". fizzle. late bd. Put Bz (EF4) back where it was. |
| Feb 17 1999 04:35:23:250PM | 990217023 | Steve Wolfe | Shot 23: fizzle! bd at 6msec |
| Feb 17 1999 04:58:41:327PM | 990217024 | Steve Wolfe | Shot 24: Another fizzle. Bz now looks very positive. Programming says it is the same as 21. |
| Feb 17 1999 05:08:27:123PM | 990217024 | Steve Wolfe | Shot 25: Tweak ef4 more negative by 10A, plasma. long h-mode followed by two shorties. |
| Physics Operator Comments | |||
| Feb 17 1999 09:43:00:700AM | Dmitri Mossessian | Miniproposal 206 (part 4): Post-boronization evaluation Overnight ECDC in He, then D2 ECDC for two hours before the run. Engineering setup: Power supply setup as on 990212 TF under hybrid control Gas setup - B-top - 6 psi of DEUTERIUM Hybrid enabled C-side - 30 psi of DEUTERIUM Hybrid enabled B-side lower - 1 psi of Ar Hybrid DISABLED Loaded from 990212015. Coldstart OK. | |
| Feb 17 1999 09:56:01:793AM | 990217001 | Dmitri Mossessian | This is "Tuesday" OH test |
| Feb 17 1999 10:03:02:827AM | 990217002 | Dmitri Mossessian | OH test is OK, this is EF3 test. |
| Feb 17 1999 10:14:09:170AM | 990217003 | Dmitri Mossessian | This shot was EF4 test, which did not work. |
| Feb 17 1999 10:19:54:903AM | 990217004 | Dmitri Mossessian | Another EF4 test. Looks OK |
| Feb 17 1999 10:36:29:857AM | 990217005 | Dmitri Mossessian | Try for plasma EF1-lower commutation capacitor did not charge. No shot. |
| Feb 17 1999 11:13:24:450AM | 990217006 | Dmitri Mossessian | EF1 test. The lower bank power supply does not work. |
| Feb 17 1999 11:56:20:153AM | 990217007 | Dmitri Mossessian | Another EF1 test. No charging again. |
| Feb 17 1999 12:23:25:170PM | 990217008 | Dmitri Mossessian | Another EF1 test. Seems to be OK. |
| Feb 17 1999 12:40:18:013PM | 990217009 | Dmitri Mossessian | Try getting plasma. No success. Br too low. |
| Feb 17 1999 12:55:34:327PM | 990217010 | Dmitri Mossessian | Increased Br0 offset by 2 mT to 0.0045. Plasma. 1.65 sec long, multiple H-modes. |
| Feb 17 1999 01:09:19:560PM | 990217011 | Dmitri Mossessian | Try again with no changes in PCS. Fizzle |
| Feb 17 1999 01:17:45:437PM | 990217012 | Dmitri Mossessian | Try again with no changes in PCS. Plasma, 1.65 sec long, several H-modes at approx. 1 MW RF. |
| Feb 17 1999 01:38:04:090PM | 990217013 | Dmitri Mossessian | No changes. Fizzle |
| Feb 17 1999 02:00:17:560PM | 990217014 | Dmitri Mossessian | Increased Bz0. Plasma with some H-modes. |
| Feb 17 1999 02:06:38:310PM | 990217015 | Dmitri Mossessian | No PCS changes. Wait for pressure to come down to 1.1e-6. Pressure right before pulse - 8.5e-7. Fizzle |
| Feb 17 1999 02:24:13:670PM | 990217016 | Dmitri Mossessian | No PCS changes. Pressure right before pulse - 6.0e-7 PLasma. |
| Feb 17 1999 02:45:21:733PM | 990217017 | Dmitri Mossessian | No PCS changes. Wait till pressure comes down to 7.2e-7 before pulse. Plasma. |
| Feb 17 1999 03:07:19:687PM | 990217018 | Dmitri Mossessian | No PCS changes. Pressure 7.9e-7 before pulse. Fizzle |
| Feb 17 1999 03:26:48:890PM | 990217019 | Dmitri Mossessian | No PCS changes. Plasma. |
| Feb 17 1999 03:47:22:123PM | 990217020 | Dmitri Mossessian | No PCS changes. P=7.2e-7 Fizzle |
| Feb 17 1999 03:58:02:200PM | 990217021 | Dmitri Mossessian | No PCS changes. P=6.0e-7 Plasma |
| Feb 17 1999 04:17:02:043PM | 990217022 | Dmitri Mossessian | Moved ZXL up 1 cm at .44 sec. IC_EF4 up 10 A at startup to bring Bz0 up a little. Fizzle |
| Feb 17 1999 04:33:33:530PM | 990217023 | Dmitri Mossessian | IC_EF4 down 10 A at startup - return Bz0 to previous value. Fizzle |
| Feb 17 1999 04:51:03:170PM | 990217024 | Dmitri Mossessian | Moved the beginning of the IC_EF4 rampup back to -.003 sec (moved it to 0.0 on the previous shot) Fizzle. Bz0 is too high, although the IC_EF4 is the same as in all good shots. |
| Feb 17 1999 04:58:11:250PM | 990217025 | Dmitri Mossessian | Moved the IC_EF4 to -1270 (10 down) - as it was before shot 14. Plasma |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:54:37:420AM | Test | Ok | OH1 and OH2 Tuesday Morning Test |
| 2 | 10:03:15:263AM | Test | Ok | EF3 test |
| 3 | 10:10:59:217AM | Test | Ok | ef4 test no good not enabled |
| 4 | 10:17:48:043AM | Test | Ok | ef4 test ok |
| 5 | 10:28:45:840AM | Test | Bad | No shot due to commutaion power supply problem |
| 6 | 11:06:33:920AM | Test | Ok | No Commutation EF1 |
| 7 | 11:52:19:543AM | Test | Ok | ef1lower comm test |
| 8 | 12:19:20:733PM | Test | Ok | EF1 Commutation supplies working |
| 9 | 12:28:48:293PM | Plasma | Ok | fizzle no faults |
| 10 | 12:43:36:653PM | Plasma | Ok | no faults/plasma |
| 11 | 12:59:26:890PM | Plasma | Ok | no faults |
| 12 | 01:13:05:983PM | Plasma | Ok | no faults/plasma |
| 13 | 01:29:50:153PM | Plasma | Ok | No Faults |
| 14 | 01:43:45:233PM | Plasma | Ok | no faults/plasma |
| 15 | 02:02:49:950PM | Plasma | Ok | No Faults |
| 16 | 02:18:28:373PM | Plasma | Ok | No Faults |
| 17 | 02:43:05:920PM | Plasma | Ok | No Faults / Plasma |
| 18 | 03:05:17:780PM | Plasma | Ok | No Faults |
| 19 | 03:21:08:450PM | Plasma | Ok | No Faults / Plasma |
| 20 | 03:45:44:390PM | Plasma | Ok | No Faults |
| 21 | 03:56:41:077PM | Plasma | Ok | No Faults / Plasma |
| 22 | 04:15:38:967PM | Plasma | Ok | No Faults |
| 23 | 04:29:38:187PM | Test | Ok | No Faults |
| 24 | 04:43:13:653PM | Test | Ok | No Faults |
| 25 | 04:56:38:403PM | Test | Ok | No Faults / Plasma |