Miniproposals

Miniproposal: 214 Date Filed: 1/5/1999 Title: D and E-port RF System Commissioning First Author: Steve Wukitch Session Leader: Steve Wukitch (shots 1-16)

Engineering Operator Run Comment

MP 206/pt.4/Goetz/Silva

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:19:150PM

Author: To Be Determined

MP214 "ICRF Conditioning" Engineering Setup for 990212 Power supplies as for 990210018 Helium ECDC after overnight boronization 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 not enabled fill C-side with 30 psi of D2 Hybrid enabled The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV Physics goals 1. Steady controlled power from both ICRF systems in L-mode. 2. Steady controlled power from both ICRF systems in H-mode. Yesterday the RF was running poorly without controlled RF output power. We added additional monitors to try to track down the problem. We will have power room access as needed to sort out ____________________________________________________________________________ Pressure: 21.9 PSI 22.7 PSI ST1: 540 PS1: 441 ST2: 2297 PS2: 963 PWR: 800 kW 1 MW 001 fizzle 002 fizzle 003 plasma with short H-mode, H/D reached #2 ran with one fault #1 ramped properly ST1: 578 PS1: 416 ST2: 2445 PS2: 993 004 plasma with short H-modes, H/D reached #2 ran with faults #1 ramped with entirely different gain (about 8x) ST1: 578 PS1: 412 ST2: 2448 PS2: 989 005 early disruption at 0.48 sec PF breaker pulled 006 #2 still excessive power #1 ran smoothly without interruption 007 backed out 008 magnet resistance fault swapped HP preamps 008 plasma good ramps in both #1 and #2 problem in #2 is not solved but we know it is not the HP preamp. recalculated E-port MW coefficients old: -.783495,.474106,-2.77058 new: -0.75454555,0.52070604,-2.8335327 Monitor HP signal generator on next output PWR: - ramp from 0.2-1.3 MW 009 plasma no power out of #1 010 plasma no power out of #1 HP generator output 1.54 V found error in #1 chain 011 plasma good ramp in #1 HP generator output 1.47 V 012 plasma good ramp in #1 HP generator output 1.47 V Change timing so D and E overlap recalculate MW coefficients for D-port old: [0,-1,0] new: [-0.45772295,0.20726647,-0.91921977] 013 plasma with short H-mode #1 and #2 ran together 014 plasma - 2.5 MW #1 ran without faults #2 ran with 2 faults ST1: 576 PS1: 425 ST2: 2249 PS2: 1063 015 plasma with short H-modes 016 plasma just one fault on #1 *********************** ****** SUMMARY ****** *********************** Troubleshooting FMIT#1 required most of the campaign to accomplish. The most likely problem is the signal generator. Once we put a splitter after the generator, the output power for a given voltage input became repeatable. Four discharges were then run where the combined output power was ~2.5 MW. Further testing of the signal generator is required to verify whether the signal generator is malfunctioning. The next issue to address is heating H-modes. Almost without exception the transmitters faulted when the H->L transition occurred.

Physics Operator Summaries

Entered: Jul 7 2004 04:37:00:100PM

Author: To Be Determined

Physics operator summary for 990212 EO: Silva PO: Goetz SL: Wukitch Run 990212 was in support of Mini-Proposal #214 - ICRF Conditioning. The RF cabal needs some shots to debug the feedback problems with transmitter #1. The run today was a success in that the RF cabal are homing in on the problems with transmitter #1. See the session leader's summary for a discussion of these results. The first two shots of the day had early breakdowns and resulted in strong fizzles with the plasmoid moving outward. After a ICEF4 tweak and a 2ms increase in the pre-puff duration, reliable startup was achieved for the remainder of the run. Breakdown times between 6 and 7ms with good current rises were obtained. Attempts were made to make the plasma ramp down further. Changes included running a limited plasma and keeping the plasma down (in ZCUR). Today it appeared that running a limited rampdown was more successful in getting the plasma current down than remaining diverted. The OH1 crossover caused one early disruption today. This occured after the rise rate of IP (segment 2) was slowed down. The IP ramp rate was increased (segment 2) and the problem became more manageable. The argon puff was moved back to 0.45s, which is after the crossover, and then slowly moved back (shot-to-shot) to 0.39s. No discernible difference in plasma performance was noted. Engineering, computing, and diagnostics today: TF power supply faulted during RECOOL. These faults were unexplained and the run proceeded. LOGBOOK was slow during a stretch today which cause a couple CYCLE hangs. SPANNA froze at one point during the run. This led to an unintended shot cycle which in turn caused a magnet resistance fault. Still some intermittent CAMAC lossed today. Scorecard: 16 shots = 13 plasmas + 2 fizzles + 1 dud + 0 tests Shot summary for Run 990212: Load 990210018 tweak the ramp-down: RCUR in and ZCUR up to the midplane coldstart hybrid - everything loaded; all matrices respond Shot change result ____ _____ ______ 1 see above fizzle; strong one; b.d. @ .005; moves out 2 IC_EF4=-1280A fizzle; b.d. @ .0055; moves out; not enough Bz 3 IC_EF4=-1270A; PG4=18ms plasma; b.d. @ .006; good current rise disr. @ 1.7 4 enable B-Side-lower plasma; b.d. @ .006; good current rise disr. @ 1.67 5 tweak RXU and ZCUR in ramp-down plasma; b.d. @ .006; good current rise; disr. @ .48; fueling @ .43; OH1 @ .40 6 PG3=32ms @ 0.35s; increase Ip plasma; b.d.@.006; good current rise; ramp in seg2 almost didn't get through crossover 7 PG3@0.45s; slow ZCUR ramp in dud; no OH1 or EF1s ramp-down 8 try again plasma; b.d. @ .0065; slight current rise hesitation; disr. @ 1.36 9 draw IP=-760000; PG3 @ 0.43; plasma; b.d. @ .006; disr. @ 1.39 with speed up ZCUR ramp in rampdown growing vert. instability 10 reload ZCUR from 990212004; plasma; b.d. @ .006; disr. @ 1.5; PG3 moved to 0.41s behavior o.k. during crossover 11 PG3 moved to 0.4s; CLEARIN plasma; b.d. @ .006; disr. @ 1.57; ramped in harder at end ramp-down better 12 PG3 moved to 0.39s; more plasma; b.d. @ .0065; slight hesitation CLEARIN changes disr. @ 1.5 - no vert. inst. 13 reload CLEARIN from 990212011 plasma; b.d. @ .006; o.k. current rise disr. @ 1.56 14 ZCUR up slower and CLEARIN in plasma; b.d. @ .006; slight hesitation harder during ramp-down on current; disr. @ 1.59 15 RCUR=.671m; more of the CLEARIN plasma; b.d. @ .007; o.k. current rise; and ZCUR changes from 014 o.gap=.008m; disr. @ 1.58s 16 hold ZCUR down further plasma; b.d. @ .0065; o.gap=.008m; disr. @ 1.57 Run ended early to begin preparations for boronization.

Session Leader Comments
Feb 12 1999 09:21:33:437AM	990212002	Steve Wukitch	002 fizzle
Feb 12 1999 09:38:22:810AM	990212003	Steve Wukitch	003 plasma with short H-mode #2 ran with one fault #1 ramped properly
Feb 12 1999 10:05:23:700AM	990212004	Steve Wukitch	004 plasma with short H-modes, H/D reached #2 ran with faults #1 ramped with entirely different gain (about 8x)
Feb 12 1999 10:05:35:467AM	990212005	Steve Wukitch	005 early disruption at 0.48 sec
Feb 12 1999 12:05:01:750PM	990212010	Steve Wukitch	010 plasma no power out of #1
Feb 12 1999 12:43:57:310PM	990212011	Steve Wukitch	011 plasma good ramp in #1
Feb 12 1999 12:44:07:153PM	990212012	Steve Wukitch	012 plasma good ramp in #1
Feb 12 1999 03:43:26:683PM	990212013	Steve Wukitch	013 plasma with short H-mode #1 and #2 ran together
Feb 12 1999 03:44:39:233PM	990212014	Steve Wukitch	014 plasma - 2.5 MW #1 ran without faults #2 ran with 2 faults
Feb 12 1999 03:44:56:077PM	990212015	Steve Wukitch	015 plasma with short H-modes
Feb 12 1999 03:45:10:500PM	990212016	Steve Wukitch	016 plasma just one fault on #1

Physics Operator Comments
Feb 12 1999 08:24:44:293AM		John Goetz	Run 990212 In support of MiniProposal 214 - ICRF Conditioning Engineering Setup for 990212 Power supplies as for 990210018 Helium ECDC after overnight boronization 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 not enabled fill C-side with 30 psi of D2 Hybrid enabled Physics Debug the electronics problems in the Transmitter#1 feedback chain.
Feb 12 1999 09:05:02:687AM	990212001	John Goetz	Shot 990212001 Load 990210018 Results Fizzle breakdown @ .005; plasmoid moves out; not enough Bz
Feb 12 1999 09:22:04:233AM	990212002	John Goetz	Shot 990212002 IC_EF4 = -1280A Results Fizzle breakdown @ .0055; plasmoid moves out; still not enough Bz to catch it
Feb 12 1999 09:37:21:750AM	990212003	John Goetz	Shot 990212003 IC_EF4 = -1270A PG4 = 18ms (was 16) Results Plasma - breakdown @ .006 - good current rise disrupts in ramp-down @ 1.7s
Feb 12 1999 09:52:11:750AM	990212004	John Goetz	Shot 990212004 no changes Results Plasma - breakdown @ .006 - good current rise disrupts in ramp-down @ 1.67s outer gap = 1cm as per request of RF cabal
Feb 12 1999 10:13:27:200AM	990212005	John Goetz	Shot 990212005 move RXU up and ZCUR up faster in the rampdown Results Plasma - breakdown @ .006 - good current rise disrupts @ 0.48s; fueling badness begins @ 0.43s (OH1 crossover begins @ .39)
Feb 12 1999 11:27:07:233AM	990212006	John Goetz	Shot 990212006 PG3=32ms @ 0.35s speed up Ip ramp up rate Results plasma - b.d. @ .006 disrupts @ 1.47 in ramp-down almost didn't make it through crossover
Feb 12 1999 11:27:49:403AM	990212007	John Goetz	Shot 990212007 SPANNA reboot miscommunication on INIT Results dud no OH1 or EF1s
Feb 12 1999 11:29:02:437AM	990212008	John Goetz	Shot 990212008 PG3 moved to 0.45s ZCUR slower in ramp-down Results plasma - b.d. @ .0065 - slight hesitation in current rise disrupts @ 1.36 in ramp-down better cross-over behavior
Feb 12 1999 11:47:40:450AM	990212009	John Goetz	Shot 990212009 speed up ZCUR ramp in ramp-down PG3 moved to 0.43s draw IP = -760000 Results plasma - b.d. @ .006 - o.k. current rise disrupts @ 1.39 in ramp-down with growing vertical instability cross-over behavior getting better
Feb 12 1999 12:09:21:293PM	990212010	John Goetz	Shot 990212010 reload ZCUR programming from shot 004 PG3 moved to 0.41s Results plasma - b.d. @ .006 - o.k. current rise disrupts @ 1.5 in ramp-down with growing vertical instability @ 1.4 cross-over behavior good
Feb 12 1999 12:25:27:560PM	990212011	John Goetz	Shot 990212011 pull CLEARIN in harder during rampdown PG3 moved to 0.4s Results plasma - b.d. @ .006 - o.k. current rise disrupts @ 1.57 in ramp-down with slow vertical instability @ 1.55 cross-over behavior good no argon effects seen
Feb 12 1999 12:44:12:187PM	990212012	John Goetz	Shot 990212012 pull CLEARIN in harder during rampdown (some more) PG3 moved to 0.39s Results plasma - b.d. @ .006 - slight current rise hesitation disrupts @ 1.5 in ramp-down with no vertical instability - limited plasma that goes up cross-over behavior good no argon effects seen
Feb 12 1999 01:00:53:653PM	990212013	John Goetz	Shot 990212013 reload CLEARIN wire from 990212011 Results plasma - b.d. @ .006 - o.k. current rise disrupts @ 1.56 in ramp-down with no vertical instability no change in the cross-over or argon behavior
Feb 12 1999 01:18:05:217PM	990212014	John Goetz	Shot 990212014 don't move ZCUR up as far during ramp-down pull CLEARIN in hard during ramp-down Results plasma - b.d. @ .006 - slight current rise hesitation disrupts @ 1.59 in ramp-down with no vertical instability - not really limited until the end
Feb 12 1999 01:54:42:623PM	990212015	John Goetz	Shot 990212015 RCUR = 0.671m (RF wants a smaller outer gap) keep ZCUR down during ramp-down pull CLEARIN in harder during ramp-down Results plasma - b.d. @ .007 - o.k. current rise disrupts @ 1.58 in ramp-down with no vertical instability - limited after 1.4s outer gap = 8mm; acceptable to the RF
Feb 12 1999 02:07:55:903PM	990212016	John Goetz	Shot 990212016 keep ZCUR even lower during ramp-down Results plasma - b.d. @ .0065 - o.k. current rise disrupts @ 1.57 in ramp-down with no vertical instability - limited after 1.4s outer gap = 8mm; acceptable to the RF

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:54:44:403AM	Plasma	Ok	no faults/dud
2	09:09:45:670AM	Plasma	Ok	no faults/dud
3	09:24:39:467AM	Plasma	Ok	no faults/plasma
4	09:41:18:060AM	Plasma	Ok	no faults/plasma
5	10:00:34:513AM	Plasma	Ok	oh1 self powered ckt. fired/disruption
6	10:23:51:293AM	Plasma	Ok	no faults/plasma
9	11:38:25:840AM	Plasma	Ok	(null)
10	11:58:02:653AM	Plasma	Ok	(null)
11	12:15:05:280PM	Plasma	Ok	(null)
12	12:34:36:577PM	Plasma	Ok	(null)
13	12:50:27:810PM	Plasma	Ok	(null)
14	01:07:25:107PM	Plasma	Ok	No Faults / Plasma
15	01:44:34:700PM	Plasma	Ok	No Faults / Plasma
16	02:01:55:420PM	Plasma	Ok	(null)