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 1-14)

Engineering Operator Run Comment

MP214 ICRF commissioning,Wukitch/Goetz/Irby/Cochran/Dekow/

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Physics Operator Summaries

Entered: Jul 7 2004 04:37:09:723PM

Author: To Be Determined

Physics operator summary for 991020 EO: Cochran & Dekow PO: Irby & Goetz SL: Wukitch Run 991020 was in support of MP 214 -- ICRF Conditioning. The purpose of today's run is to determine the best way to operate the J-port antenna. Run repetitive shots similar to Shot 991019014 and twiddle about. Some plasmas were produced toward completion of the RF run plan. See the Session Leader's summary for a synopsis of accomplishments. The run today was very difficult. It was plagued by fizzles and duds. Eventually the IC_EF4 was lowered to -1290A and the prefill was raised to 26ms and three plasmas followed. The null looked quite marginal until the last few shots of the day, but the null looked similar to those obtained on 991019. The fill was raised after the duds and resulted in plasmas. However, shot 010 - a dud, followed shot 009 - a plasma with no PCS changes. The fill pressure eventually ended up at about .073mTorr for shots 13 & 14. It seemed that changes in IC_EF4 did not always manifest themselves in changes in Bz, see for example shots 005 and 012. Twiddles were performed on BR_0 and eventually an offset value of between -.0005 and -.001 was found to be acceptable. Engineering, computing, and diagnostics today: A TF pulse with a 2T flattop from 2.7 to 2.85s was used today to measure the TF magnet resistance. Until further notice this TF waveform should be used so that Irby can monitor the TF magnet resistances. There was a long break to fix a problem with the master control board for OH2L. Another 1 hr break in the afternoon was taken to fix a loose wire on a EF1L control board. However, this fix did not cure the problem with the EF1L lagging the EF1U in the precharge. Scorecard: 14 shots = 6 plasmas + 2 fizzles + 2 duds + 4 tests Shot summary for Run 991020 Load 991019014 coldstart hybrid - everything loaded; all matrices respond Shot change result ____ _____ ______ 1 test shot for TF scanner 2 TF test shot 3 OH test shot looks o.k. 4 see above plasma; b.d. @ .0065; hesitation @ .02; lots of hard x-rays; injection @ 1.03; disruption @ 1.07s 5 BR_0=-.0015; IC_EF4=-1275A; fizzle; b.d. @ .006; Bz got less pos. prepuff=20ms; add some PG3 in which is opposite of what was asked for seg 1; move ZXL down and RXL in late in the shot 6 IC_EF4=-1265A; BR_0=-.001; dud; fields look as good as those prepuff=18ms yesterday; pressure is .05 vs .057 on 991019014 7 BR_0=-.0015; raise prepuff to plasma; b.d. @ .007; still a slight 23ms hesitation; strikes remain below the noses and no early disruption 8 prepuff to 22ms; TF ramp to fizzle; b.d. @ .008; Br looks too 50kA from 1.5 to 1.65s negative 9 BR_0=-.00075 plasma; b.d. @ .007; Br right at 0. good current rise; plasma o.k. for RF 10 no changes dud; fields look like shot 009 as do the bus currents 11 break to fix loose wire on a EF1 PLC test shot - look o.k. EF1L control board 12 IC_EF4=-1280A; prepuff to 25ms plasma; b.d. @ .0065; slight hesitation EF1L not fixed; no change in Bz; plasma not moving out fast enough 13 IC_EF4=-1290A; prepuff to 26ms; plasma; b.d. @ .006; good current rise hydrogen puff to 250ms o.k. for RF 14 no changes plasma; b.d. @ .006; o.k. for RF

Session Leader Comments

Physics Operator Comments
Oct 20 1999 08:15:14:717AM		Jim Irby	Coldstart complete
Oct 20 1999 08:18:42:967AM		Jim Irby	Took two test shots of TF tap instrumentation during ECDC this morning: 2213, 2214 Took one test shot after ECDC without any PEI current: 2215
Oct 20 1999 08:22:46:200AM		Jim Irby	Loaded 991019014/ loadclean
Oct 20 1999 09:42:06:857AM		John Goetz	Engineering Setup for 991020: Run will begin at 9:00 Setup power supplies from shot 991019014 this shot has a long TF waveform for resistance measurements Two hours of ECDC in D2 prior to the run. Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled fill B-side upper with 10 psi of H2 Hybrid enabled fill C-side with 30 psi of D2 Hybrid enabled leave J-bottom as is Hybrid DISABLED **** fill divertor capillary system with 2psi of helium-4 plus 2psi of helium-3 **** The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV ------------------------------------------------------------------------------- Run Plan for 991020: MP 214 -- ICRF commissioning Load shot 991019014 and try different combinations of D, E, and J to determine the best operating scenario.
Oct 20 1999 09:23:36:607AM	991020001	Jim Irby	no power test to get scanner data
Oct 20 1999 10:11:39:390AM	991020002	John Goetz	Between shots 2 & 3: Pause to fix a fiber-optic board problem with OH2L
Oct 20 1999 12:33:26:140PM	991020003	John Goetz	Shot 991020003 OH test shot to check on the OH2L master control board Results looks o.k.
Oct 20 1999 12:54:44:293PM	991020004	John Goetz	Shot 991020004 load 991019014 Results plasma; breakdown @ .0065; hesitation after it hits something @ .02s current rise is slower than that of 991019014 lots o' hard x-rays injection at 1.03s; disruption @ 1.09s
Oct 20 1999 01:14:54:750PM	991020005	John Goetz	Shot 991020005 BR_0 offset to -.0015 from -.001 ICEF4 to -1275A from -1285A add PG3 early in segment 1 and make prepuff 20 ms (from 18ms) move ZXL down and RXL in to keep strike points below the noses Results fizzle; b.d. @ .006; hardly any current rise Bz was less positive than shot 4 which is not what was programmed!
Oct 20 1999 01:32:23:217PM	991020006	John Goetz	Shot 991020006 BR_0 offset back to -.001 ICEF4 to -1265A from -1275A take prepuff back to 18ms move ZXL down and RXL in to keep strike points below the noses Results dud; fields look as good as they were on 991019014 fill pressure is quite a bit lower though; .05 vs. .057 mTorr
Oct 20 1999 01:49:11:327PM	991020007	John Goetz	Shot 991020007 BR_0 offset back to -.0015 prepuff = 23ms move ZXL down and RXL in to keep strike points below the noses Results plasma; breakdown @ .007s; still a slight hesitation in the current rise fill pressure = .0062mTorr must have been the gas strike points stay below the noses and no early disruption
Oct 20 1999 02:04:59:717PM	991020008	John Goetz	Shot 991020008 prepuff = 22ms make the TF ramp from 150kA to 50kA from 1.5 to 1.65s (was 1.5 to 2.35s) Results fizzle; breakdown @ .008s; Br is too negative
Oct 20 1999 02:24:50:700PM	991020009	John Goetz	Shot 991020009 BR_0 = -.00075 (was -.0015) Results plasma; breakdown @ .007s; Br about 0 good current rise acceptable plasma for the RF
Oct 20 1999 02:56:48:153PM	991020010	John Goetz	Shot 991020010 BR_0 = -.0005 Results dud! fields look similar to those of shot 009 EF4s and OH2s and EF1s look like shot 009 is the gas too low?
Oct 20 1999 03:53:07:640PM	991020011	John Goetz	Shot 991020011 break to fix a loose wire on a EF1L control board Results EF1 PLC test - looks o.k.
Oct 20 1999 04:13:54:390PM	991020012	John Goetz	Shot 991020012 IC_EF4 = -1280A [ a comparison of 991020009 and 991019011 shows that Bz is a little high on 991019011 ] prepuff = 25ms Results plasma; breakdown @ .0065; o.k. current rise EF1L problem still there plasma o.k. for the RF, but H/D is pushing 10%
Oct 20 1999 04:35:51:047PM	991020013	John Goetz	Shot 991020013 IC_EF4 = -1290A prepuff = 26ms hydrogen puff to 250ms Results plasma; breakdown @ .006; great current rise plasma o.k. for the RF hydrogen fraction down a touch
Oct 20 1999 04:57:37:860PM	991020014	John Goetz	Shot 991020014 no changes Results plasma; breakdown @ .006; great current rise plasma o.k. for the RF

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:10:26:153AM	Test	Ok	Scanner test shot only
2	09:26:30:500AM	Test	Ok	TF test shot ,plc control ,150kamps
3	12:28:59:717PM	Test	Ok	(null)
4	12:44:01:280PM	Plasma	Ok	(null)
5	01:03:42:780PM	Plasma	Ok	fizzle
6	01:20:40:013PM	Plasma	Ok	(null)
7	01:38:05:890PM	Plasma	Ok	(null)
8	01:58:34:733PM	Plasma	Ok	(null)
9	02:16:47:827PM	Plasma	Ok	(null)
10	02:42:03:200PM	Plasma	Ok	fizzle
11	03:49:32:653PM	Test	Ok	EF1 Test
12	04:02:27:640PM	Plasma	Ok	(null)
13	04:24:32:263PM	Plasma	Ok	(null)
14	04:49:46:997PM	Plasma	Ok	(null)