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 1-25)

Miniproposal: 225 Date Filed: 1/14/1999 Title: Determination of the Mo source which dominates the core Mo levels First Author: Bruce Lipschultz Session Leader: Steve Wukitch (shots 1-25)

Engineering Operator Run Comment

MP#214/Wolfe, Silva

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:22:477PM

Author: To Be Determined

---------------------------------------------------------------------------- 991109xxx wukitch RF Nov 10 1999 6:53:15:576AM . . . . . . . . . . . . . . . . . . . . Run 991109 in support of MP214: RF Conditioning MP225: Determination of Mo Source, will ride along as possible. Run will BEGIN at 09:00 and END at 17:00 FMIT#3 and FMIT#4 should be made ready for operation. FMIT#1 should be warmed up and ready to go when needed. Setup power supplies from shot 991108024. This shot was a 5.2 T, 800 kA discharge, with a 1.5 s flattop. We will continue with 50 kA backporch on TF pulse. Two hours of ECDC in D2 at 2.e-4 Torr before the run (should be stopped by 08:00). Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 10 psi of H2 Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled Enable ECE and VUV. ********* Run plan ********* Condition J-port antenna. Evaluate effect of gap, current, plasma shape on impurity production. Shot Schedule: 1. compare D, J-port (0,pi,0,pi,), J-port (0,pi,pi,0), J3, J4 at moderate power levels 0.5, 0.75, and 1.0 MW each step is 0.27 sec (5 good shots) 2. compare J-port (0,pi,0,pi,), J-port (0,pi,pi,0), J3, J4 at moderate power levels in H-mode D-port at 1.4 MW (4 good shots) 3. with J-port (0,pi,0,pi,) and D at constant power, scan B 4.4 T, 4.8 T, 5.2 T, and 5.6 T (4 good shots) 4. with J-port (0,pi,0,pi,) and D at constant power, scan outer gap 1.4, 1.0, and 0.6 cm. (3 good shots) 5. with J-port (0,pi,0,pi,) and D at constant power, scan Ip 0.6, 0.8, 1.0 and 1.2 MA. (4 good shots) 6. Go to best condition and raise power level. (5-10 shots) ---------------------------------------------------------------------------- 002 Plasma, small h-mode at the end with D XMTR 1 and 4 went through, good tune on both XMTR 3 didn't make it, bad tune. good gap, density and plasma in general. H/D reads 0.02 on that shot. To watch. Next shot XMTR 3, attempt of a retune, not much to work with. minor tweak to 4. 003 Plasma, small h-mode at the end with D XMTR 1 and 4 went through, good tune on both XMTR 3 much better, although the tune needs somw tweaking good gap, density and plasma in general. Injections during higher power pulse with 3 and 4 H/D reads 0.02 on that shot. To watch. Next shot XMTR 3, tweaked a little more minor tweak to 1 and 4. 004 Plasma, EDA H-mode with J only APS material Next shot: repeat 005 Plasma, H-mode with J only more impurities Next shot: repeat and enable H gas puff (same as 991019007) 006 Plasma, H-mode with J only Next shot: next shot J4 only 007 Plasma early disruption J4 ran with some interrupts radiation increases with step up to 1 MW H fraction increased to 6% before Next shot: next shot J3 only and cut H puff by 1/2 009 plasma J3 faults and fairly dirty next shot: back to J3 and J4 together with 0,pi,0,pi phasing 012 plasma H-mode with J alone comment: 1. no changes in tune required going from running J as one antenna and as two separate 2. clean operation appears to have an upper limit around 650 kW. - is it power density or total power? next shot: j4 only with short D pulse 014 plasma short H-mode with D-port impurity injection with 650 kW comment: clearly power density next shot: J with D port providing H-mode hopefully 015 plasma short H-modes with D-port comment: cannot tune D-port because we have lost the phase information associated with DC1 we will skip H-mode evaluation until we can repair this channel next shot: begin Ip scan; go to 1 MA 016 plasma injection occurs at the same power again right gap is ~0.5 cm next shot: change gap to 0.8 cm 017 plasma injection occurs at the same power again right gap is ~0.9 cm next shot: change Ip->1.2 MA 018 plasma short H-modes injection occurs at lower power right gap is ~0.9 cm next shot: repeat 019 plasma injection at 0.5 sec - not from the RF next shot: repeat 020 plasma brief H-modes no large injection, but overall level is higher next shot: back to 800 kA and change power steps 021 plasma brief H-modes injection at 1.31 sec - as usual next shot: increase power step to 1.6 MW total 022 plasma early disruption disrupts after going to 1.6 MW comment: plasma disrupts when the RF goes above 1.3 MW next attempt to raise the power will occur when the 2pi diode remains < 500 kW next shot: 1.3-1.4 MW pulse disable H puff 023 plasma - disruption (1.3 sec) short H-modes next shot: 1.3-1.4 MW pulse 024 plasma - disruption (1.28 sec) brief H-mode next shot: 1-1.4 MW pulse 025 plasma - disruption (~1.07 sec) radiated power increases nonlinearly after 1.2 MW ********** Summary ********** We accomplished points 1, 5, and 6 minus 0,pi,pi,0 phase information. The basic conclusion is that the impurity production is power density dependent. The working definition of power density limit is the power density at which an injection event occurred. The limit is about 650 kW/strap pair. Changing the SOL density scale length by increasing plasma current did not affect the observed power density limit. Repeated discharges at the limit did not show an improvement and had repeatable disruptions. We did not continue with the H-mode testing because D-port was missing an important signal required for tuning.

Physics Operator Summaries

Entered: Jul 7 2004 04:37:10:020PM

Author: To Be Determined

Physics Operator Summary for Tues. 991109 MP#214 ICRF Commissioning (J-port) MP#225 Impurity sources (piggyback) SL: Wukitch PO: wolfe EO: Silva, Cochran Engineering Setup: --------------------- Setup power supplies from shot 991108024. This shot was a 5.2 T, 800 kA discharge, with a 1.5 s flattop. We will continue with 50 kA backporch on TF pulse. Two hours of ECDC in D2 at 2.e-4 Torr before the run (should be stopped by 08:00). Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 10 psi of H2 Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled Enable ECE and VUV. ********* Run plan ********* Condition J-port antenna. Evaluate effect of gap, current, plasma shape on impurity production. Shot Schedule: 1. compare D, J-port (0,pi,0,pi,), J-port (0,pi,pi,0), J3, J4 at moderate power levels 0.5, 0.75, and 1.0 MW each step is 0.27 sec (5 good shots) 2. compare J-port (0,pi,0,pi,), J-port (0,pi,pi,0), J3, J4 at moderate power levels in H-mode D-port at 1.4 MW (4 good shots) 3. with J-port (0,pi,0,pi,) and D at constant power, scan B 4.4 T, 4.8 T, 5.2 T, and 5.6 T (4 good shots) 4. with J-port (0,pi,0,pi,) and D at constant power, scan outer gap 1.4, 1.0, and 0.6 cm. (3 good shots) 5. with J-port (0,pi,0,pi,) and D at constant power, scan Ip 0.6, 0.8, 1.0 and 1.2 MA. (4 good shots) 6. Go to best condition and raise power level. (5-10 shots) ----------------------------------------------------------------------------- The machine ran well today. We accomplished step 1, and most of step 5. D-port lost some tuning information, so it was shut down after shot 15. We encountered some disruptivity (2/3) at 1.2MA in ramp-down. Step 6 (raising the power) was tried on shots 22-25, with no great success (they all disrupted, earlier each shot.) We had one post-disruption fizzle (shot 8). Thereafter, I tried reducing the pre-puff from 18->16msec following disruptions. I don't know if it helped, but we had no more fizzles. We continued to lose shots to a gremlin in the alternator, which caused us not to be able to ramp up the excitation. Apparently, a breaker was pulling after the shots, and not getting reset. In the course of diagnosing this problem, it was discovered that the excitation supply was single-phasing in inversion. It is not clear whether these phenomena are related. H2 was puffed on shots 6-9. Due to a mis-communication, it was turned off from 12-19, and the Ar turned on instead. It was put back for 20-22, then turned off intentionally for 23-25. Scorecard: ---------- Null cycles/tests 4 Duds 0 fizzles 1 plasmas 20 -------------- -- Total shots 25

Session Leader Comments

Physics Operator Comments
Nov 9 1999 07:31:46:403AM		Steve Wolfe	coldstart at 07:30 No errors; all matrices respond.
Nov 9 1999 09:16:54:373AM	991109001	Steve Wolfe	Shot#1: Continue from where we left off yesterday (991108027) There is again a problem closing the air-switch. And can't ramp the excitation. And we have an access breach in the power room. Now will have a null cycle.
Nov 9 1999 09:30:13:793AM	991109001	Steve Wolfe	Shot#1: null cycle to re-synch
Nov 9 1999 09:49:32:187AM	991109002	Steve Wolfe	Shot#2: try again for a shot. plasma. Got some power out of D at the end of flattop; h-mode. J4 to .5MW, no J3. startup has a bit of hesitation, too much early gas. next shot: delay seg1 pg3 from .028 to .030 sec
Nov 9 1999 10:08:13:717AM	991109003	Steve Wolfe	Shot#3: delay seg1 pg3 from .028 to .030 sec plasma. 2 injections and an h-mode. J3 and J4 step up to 0.5MW each, D at 1MW at end. less hesitation in startup.
Nov 9 1999 10:30:09:170AM	991109004	Steve Wolfe	Shot#4: No changes. plasma. H-mode starts during j-pulse (1.28sec).
Nov 9 1999 11:14:57:717AM	991109006	Steve Wolfe	Shot#6: Load 300ms H2 puff (PG2) from 991019007 and enable B-side upper. plasma, hmodes, still have that injection, taking a bite out of ip. Traq1 data corrupted. I will have to re-run EFIT H/D up to ~3% from 2%. Next shot: J4 only
Nov 9 1999 11:32:08:140AM	991109007	Steve Wolfe	Shot#7: J4 only. No PCS changes. Keep an eye on H/D. Disrupted at ~1.4sec; that injection finally got it. No h-mode. junk correlates with J4 stepping to 1MW. H/D gets to 6%. Next shot: Shorten H2 puff from 300->150msec
Nov 9 1999 11:45:17:497AM	991109008	Steve Wolfe	Shot#8: Shorten H2 puff from 300->150msec fizzle. slow current rise, CII burst at 13ms
Nov 9 1999 12:03:42:733PM	991109009	Steve Wolfe	Shot#9: Pre-puff from 18ms -> 16ms (should have done it last time) Shorten H2 puff from 300->150msec plasma,no h-modes. Lots of junk starting at 1 sec. current rise is fast, 67kA at 15msec.
Nov 9 1999 12:16:17:967PM	991109010	Steve Wolfe	Shot#10: Pre-puff back to 18ms from 16msec; H2 still at 150msec No alternator excitation. Run through with no power.
Nov 9 1999 12:31:56:950PM	991109011	Steve Wolfe	Shot#11:No power test. excitation ramp up is ok.
Nov 9 1999 12:47:54:310PM	991109012	Steve Wolfe	Shot#12: pre-puff back to 18msec (from 16) ; H2 puff still at 150msec plasma, injections starting ~1.3sec, 2 short h-modes.
Nov 9 1999 01:03:30:450PM	991109013	Steve Wolfe	Shot#13: No PCS changes; No excitation ramp-up again! Another no-power cycle.
Nov 9 1999 01:28:59:840PM	991109014	Steve Wolfe	Shot#14: Gwinn and Irby are trying to track down the alternator problem. No PCS changes. RF will try for j4 + a short D-pulse plasma; injection @1.33sec, 1 h-mode Next shot: Run D for whole plasma, J on top of it.
Nov 9 1999 01:49:42:450PM	991109015	Steve Wolfe	Shot#15: No PCS changes. Run D for whole plasma, J on top of it. plasma, 3 h-modes, D-port at 1MW, J3&J4 step up to ~.6MW each. Next shot: Go to 1MA.
Nov 9 1999 02:09:19:437PM	991109016	Steve Wolfe	Shot#16:: Go to 1MA. We seem to have jumped to step 5 of the run plan. plasma. dithers. No D-port, J up to ~1.3MW Gap is down to .5cm. JR reports a Ca injection at .75sec. He claims it isn't his. Next shot: RCUR from .671->.669
Nov 9 1999 02:33:02:437PM	991109017	Steve Wolfe	Shot#17: RCUR from .671->.669. Probably should have tweaked CLEARIN instead, since left gap also dropped. D-port is off intentionally (lost their phase data). plasma, injections,h-modes Next shot: 1.2MA, increase CLEARIN by 2mm after .5sec
Nov 9 1999 02:48:12:623PM	991109018	Steve Wolfe	Shot#18: 1.2MA, increase CLEARIN by 2mm between .5 and 1.5sec plasma, h-modes. disrupted at 1.56 sec, nearly full current.
Nov 9 1999 03:07:30:483PM	991109019	Steve Wolfe	Shot#19: Move CLEARIN at 1.5sec more negative by 1mm. Drop pre-puff by 2ms (post-disruption). plasma, no h-modes, back to full length. Injection at .46
Nov 9 1999 03:20:49:670PM	991109020	Steve Wolfe	Shot#20: Pre-puff back to 18sec At some point, shot 12, B-side upper was turned off and B-side lower turned on. PUt them back the way they were supposed to be for this shot. Disrupted at 1.56 again. Next shot: back to 800kA.
Nov 9 1999 03:44:35:810PM	991109021	Steve Wolfe	Shot#21: back to 800kA. Proceeding to step 6. > Reload shot 15. pre-puff back to 16ms plasma. lots of junk, but it survives. 2 h-modes. fast current rise. It actually looks like it's pumping out some now. Next shot: back to 18msec pre-puff.
Nov 9 1999 04:02:40:920PM	991109022	Steve Wolfe	Shot#22: back to 18msec pre-puff. No other PCS changes. Raising the power. plasma, no h-mode. Disrupted at 1.33sec. Got 1.6MW Next shot: drop the fill again. With luck, he'll do the same to the power?
Nov 9 1999 04:20:17:047PM	991109023	Steve Wolfe	Shot#23: Pre-puff back down to 16ms. I have no idea if this does any good, but it gives me something to do. Disable B-side upper (H2 puff), per Wukitch. Got some H-modes. Disrupted at the same time. RF at 1.4MW flat.
Nov 9 1999 04:48:21:060PM	991109024	Steve Wolfe	Shot#24: Repeat. plasma, disrupts at 1.25sec.
Nov 9 1999 04:58:05:030PM	991109025	Steve Wolfe	Shot#25: Repeat with lower power. Disrupted at 1.06sec. No h-mode. End of run.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:14:16:467AM	Test	Ok	state cycle sync
2	09:41:05:560AM	Plasma	Ok	No Faults (Plasma)
3	10:01:18:967AM	Plasma	Ok	no faults/plasma
4	10:21:58:983AM	Plasma	Ok	no faults/plasma
5	10:42:12:153AM	Plasma	Ok	no faults/plasma
6	11:01:53:843AM	Plasma	Ok	no faults/plasma
7	11:20:17:543AM	Plasma	Ok	(null)
8	11:40:00:390AM	Plasma	Ok	(null)
9	11:54:24:593AM	Plasma	Ok	(null)
10	12:13:33:360PM	Plasma	Bad	no shot alternator exitation/ air switch will not open
11	12:30:33:403PM	Test	Ok	Alt. test thru state cycle /exitation ok air switch ok
12	12:41:53:827PM	Plasma	Ok	no faults/plasma
13	01:02:00:810PM	Plasma	Ok	No exitation
14	01:22:35:403PM	Plasma	Ok	no faults/plasma
15	01:38:31:640PM	Plasma	Ok	no faults/plasma
16	01:57:33:857PM	Plasma	Ok	no faults/plasma
17	02:18:29:937PM	Plasma	Ok	no faults/plasma
18	02:40:17:060PM	Plasma	Ok	no faults/plasma
19	02:57:36:810PM	Plasma	Ok	no faults/plasma
20	03:17:55:997PM	Plasma	Ok	no faults/disruption
21	03:37:58:140PM	Plasma	Ok	no faults/plasma
22	03:57:00:327PM	Plasma	Ok	no faults/plasma
23	04:15:15:420PM	Plasma	Ok	no faults/plasma
24	04:34:57:670PM	Plasma	Ok	no faults/plasma
25	04:52:29:153PM	Plasma	Ok	no faults/plasma