Miniproposals

Miniproposal: 214 Date Filed: 1/5/1999 Title: D and E-port RF System Commissioning First Author: Steve Wukitch Session Leader: Gerd Schilling (shots 1-20)

Engineering Operator Run Comment

MP#214/Wolfe, Silva

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Physics Operator Summaries

Entered: Jul 7 2004 04:37:09:223PM

Author: To Be Determined

Physics Operator Summary for Wed. 990908 MP: 214 ICRF Commissioning SL: Schilling PO: Wolfe EO: Silva,Dekow Plan: ----- This run will be a continuation of that scheduled for August 25, 1999. The general purpose will be to condition the RF antennas. The run is scheduled to start at 9:00 and end at 17:00. The initial setup will be similar to that for shot 990902025, but with flat 1 MA current, nl04=1, right gap = 1-1.2 cm. We will start with the J-port antenna and transmitters 3 and 4. The emphasis will be on achieving high-power flattop pulses of long duration, to get the largest number of joules into the antenna short of faulting or provoking disruptions. If successful, we will then compare heating and impurity behavior with different settings of current strap phasing. If transmitters 1 and/or 2 become available, then power from D- and E-ports will be added. Engineering setup: ------------------ Two hours ECDC in D2 prior to run, finishing at least 1 hour before run. Setup power supplies from 990902025 except change all PF invert times to 2.0 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 6 psi of H2 Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled J-bottom pumped out Hybrid DISABLED The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV, PCI Results: -------- We had a bit of trouble on the Tuesday OH test. The OH2L supply went to 20kA, with a PLC setting of 10kA. Supply current read 10kA, but bus rogowski and shunt agreed that there was 20kA in the coil, and the Br was consistent with this. Suspicion fell on the optical link connecting the control cabinet with the supply. After removing and re-installing the fiber, and power cycling the supply, the problem vanished. Meanwhile, the RF'ers had requested a delay until approximately 10:30. They needed to exercise FMIT#3&4 into dummy load, and pulse #1 into vacuum to check the reflected power monitor, which had been worked on. They also needed to increase the SF6 pressure in the transmission lines back to the nominal value. The first plasma attempt (shot#4) took place at 10:45. The PCS programming was similar to 990902025, except nl04 was set to 1.0e20, RCUR was moved out by 1mm, TF lowered to 142kA, and CLEARIN waveform adjusted slightly for the 1.5sec EOF. There was no RF yet; this was mainly to make sure the rest of the system is working ok. While the shot went ok, it turns out EF1U was not quite getting to the programmed current; symptoms were similar to EF1L behavior from 990902, but it never caught up. The second plasma attempt (shot#5) had 1MW RF (from 3&4). EF1U was apparently fixed by power-cycling the supply between shots. Attempts to get power through E-port (FMIT#2) were not successful. Low power (~100kW) was coupled through D-Port (FMIT#1) beginning with shot #10, and working up to 0.6MW by the end of the run. The maximum power through J-port was 1.7-1.8MW, obtained on shot #7. J3 was somewhat less reliable than J4. Three shots disrupted (#9,12,13) with serious injections, apparently RF-induced; all occurred when J4 was running alone after J3 tripped. However, later shots survived even though J3 continued to trip out. The last shot (#20) was hit by two very early injections, at 0.17 and 0.47sec, and died before the RF had a chance. Note that the programming on shot#20 had the TF flattop extended to 1.6 sec, in an attempt to extend the rampdown just a little further. This shot should not be used as a starting point for tomorrow's run, since the extra TF heating would not be worth it, even if it did help the rampdown. There were also minor rampdown tweaks on shots #16 (RCUR) and 17 (CLEARIN), neither of which made any difference. Essentially all non-disruptive shots today ramped down to 1.87sec, the same as last Thursday. A 25msec Argon puff was present for shots #8-20, with no obvious deleterious effects. After the run, I realized that the fizzle detector may have been taking the plasma out on some shots; if we really want to ramp all the way down the F.D. off time should be changed to 1.8 or so, instead of 2.2. Progress was made in getting D-port up to 0.6MW, for the first time in quite a while. To the untutored eye, little or no progress was made on conditioning of J-port. Granetz's CHECK_MAGNETICS program is still not broadcasting to SPANNA reliably. A message was received after shot #9, but not later in the run. Looking at the log file indicates it was reporting lots of small baseline offsets, likely due to the length of the shots. Bob should check the code to make sure it is compatible with 2sec shots. Somebody (JAS?) should try to determine why the broadcast messages aren't getting through. Scorecard: ---------- Tests 3 Duds 0 Fizzles 0 Plasmas 17 (1 non-RF induced disruption) ======= == Shots 20

Session Leader Comments

Physics Operator Comments
Sep 7 1999 02:53:06:873PM		Steve Wolfe	Setting up for run 990908: Import seg 2 from 990902025 Change NL_04 to 1.0e20 flattop Change RCUR flattop from .668 to .669 (to reduce gap) Change RCUR rampdown to hold plasma out longer Save as 990908999 Load/clean
Sep 8 1999 08:07:48:233AM		Steve Wolfe	Coldstart at 08:05. Log file looks ok.
Sep 8 1999 08:08:41:373AM		Steve Wolfe	Run Plan and Engineering Setup for Wednesday, September 8, 1999. SL: Wukitch/Schilling PO: Wolfe This run will be a continuation of that scheduled for August 25, 1999. The general purpose will be to condition the RF antennas. The run is scheduled to start at 9:00 and end at 17:00. The initial setup will be similar to that for shot 990902025, but with flat 1 MA current, nl04=1, right gap = 1-1.2 cm. We will start with the J-port antenna and transmitters 3 and 4. The emphasis will be on achieving high-power flattop pulses of long duration, to get the largest number of joules into the antenna short of faulting or provoking disruptions. If successful, we will then compare heating and impurity behavior with different settings of current strap phasing. If transmitters 1 and/or 2 become available, then power from D- and E-ports will be added.
Sep 8 1999 08:09:05:327AM		Steve Wolfe	Engineering setup: Two hours ECDC in D2 prior to run, finishing at least 1 hour before run. Setup power supplies from 990902025 except change all PF invert times to 2.0 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 6 psi of H2 Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled J-bottom pumped out Hybrid DISABLED The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV, PCI
Sep 8 1999 08:20:19:060AM		Steve Wolfe	Change TF current from 150 -> 142kA for 5.1T, per request of SL.
Sep 8 1999 08:23:35:950AM		Steve Wolfe	Rf says they need time to test 3&4 into dummy load. They also need to test 1 into vacuum, and top off the SF6 in the line. We will lock up at the usual time and run the normal Tuesday test at approx 9AM. There will then be controlled access until approximately 10:30AM.
Sep 8 1999 08:53:09:137AM	990908001	Steve Wolfe	Shot #1: Tuesday test. No OH1. Need to do that again; supply setup wasn't right.
Sep 8 1999 09:10:17:873AM	990908002	Steve Wolfe	Shot #2: Tuesday test. OH1 is ok, but OH2L has twice the current? Both the bus rog and bus shunt say OH2L has 20kA. PLC is set for 10kA, and supply current claims it is at 10kA. It looks like a problem in the power supply current feedback signal.
Sep 8 1999 09:25:43:233AM	990908002	Steve Wolfe	Shot #3: While I'm waiting, move the EOF CLEARIN point from 1.404 sec to 1.5sec (val=-.006); delay subsequent points by 0.1sec.
Sep 8 1999 09:59:23:717AM	990908003	Steve Wolfe	Shot #3: Another Tuesday test, to check if the OH2L supply is fixed. Looks ok.
Sep 8 1999 10:54:28:373AM	990908004	Steve Wolfe	Shot #4: First plasma attempt. No RF on this one, but check other stuff is ok. plasma to 1.87sec; Startup ok, maybe a little inside; density is climbing during pulse, up to 1.27 by 1.5sec; outer gap looks good at ~11mm. RF will need more time to get ready. Next shot: remove PG3 feedforward after 0.6sec.
Sep 8 1999 11:33:09:310AM	990908004	Steve Wolfe	Shot #4: On closer examination, it looks like EF1U is not reaching the programmed current. It looks like the hybrid demand is not being reflected by the gate drive.
Sep 8 1999 12:38:16:733PM	990908005	Steve Wolfe	Shot #5: Try for a shot with RF. Gary and Frank power-cycled the EF1U, but did not reseat the gate board. plasma same length. EF1U behaved this time. H-modes from 1.2 - 1.38sec Got some RF: 1MW total from 3&4. Some hesitation, Br looks a bit negative; so does Bz, but plasma isn't far outside - there is one small bounce on H-alpha and some early hard-xrays. NINJA D2 pulse apparently went, although the widget says it was turned off. Density is still climbing before the H-mode. Next shot: INcrease Br_0 by .0005T (from 0 to .0005) and IC_EF4 from -1285 -> -1275A
Sep 8 1999 12:50:58:093PM	990908006	Steve Wolfe	Shot #6: INcrease Br_0 by .0005T (from 0 to .0005) and IC_EF4 from -1285 tp -1275. plasma, h-modes, RF. Stil a slight hesitation, but nothing obviously wrong. H-mode from 1.0-1.29sec; got rid of the early hards. RF to 1.5MW from 3&4. No NINJA puff this time. Density looks similar up till the H-mode. Next shot: No PCS changes; RF will try for #2 as well.
Sep 8 1999 01:07:27:170PM	990908007	Steve Wolfe	Shot #7: No PCS changes; RF will try for #2 as well. plasma - H-mode starts at .7, H-L (with ITB; Rn>1.e13) at .93, second H-mode at 1.08 Up to 1.7MW from J-port, nothing from E-port. NINJA supposedly puffed. Next shot: turn on some Ar for Goetz.
Sep 8 1999 01:32:59:733PM	990908008	Steve Wolfe	Shot #8: Put a 25msec pulse on PG1 (b-side lower) at .3sec, and enable B-side lower valve. plasma, lots of h-modes from .7-1.4sec; radiation is high. Nearly 1.8MW from J, 5kW from D, nothing from E. Hesitation is worse, maybe Bz now a little positive. Next shot: No PCS changes
Sep 8 1999 01:46:08:437PM	990908009	Steve Wolfe	Shot #9: No PCS changes disruption at .82sec, looks like an injection. RF only got to .8MW (J4 only, J3 faulted.
Sep 8 1999 01:54:01:810PM	990908009	Steve Wolfe	Shot #9: No PCS changes disruption at .82sec, looks like an injection. RF only got to .8MW (J4 only, J3 faulted. Hesitation is a little worse. Next shot: Drop prepuff from 18->16msec.
Sep 8 1999 02:07:40:060PM	990908010	Steve Wolfe	Shot #10: Decrease pre-puff from 18->16msec plasma, L-mode; 0.9MW mostly J4, .1MW from D; J3 faults early. hesitation is gone. Next shot: No PCS changes. Earl is delaying the NINJA puff to ~1.45
Sep 8 1999 02:26:21:467PM	990908011	Steve Wolfe	Shot #11: No PCS changes. Earl is delaying the NINJA puff to 1.45s plasma, h-modes, up to 1.5MW from 1,3,4; #3 is still tripping. slight hesitation. Next shot: No PCS changes.
Sep 8 1999 02:44:40:030PM	990908012	Steve Wolfe	Shot #12: No PCS changes. disruption at .85sec, injection. .6MW from J4, no J3, .06 from D
Sep 8 1999 03:05:43:750PM	990908013	Steve Wolfe	Shot #13: No PCS changes. Another disruption, about the same time Same RF, about .7MW mostly from J4.
Sep 8 1999 03:25:09:480PM	990908014	Steve Wolfe	Shot #14: No PCS changes. full plasma with h-modes. 1.7MW total, with 0.1 from D, 1 from J3, .6 from J4. Radiated power still very high (foil 2pi says 2.1MW)
Sep 8 1999 03:34:41:717PM	990908015	Steve Wolfe	Shot #15: No PCS changes. plasma, h-modes start at 1sec,P_rf=1.1MW, J3 tripping. D gets to ~.25MW
Sep 8 1999 03:55:37:013PM	990908016	Steve Wolfe	Shot #16: Hold RCUR further out after 1.7sec (just playing with the rampdown a little). plasma, no change in pulse length; h-modes 1.08-1.25 1.3MW, D=.4,J4=.9; J3 faults early, d trips out at H-L.
Sep 8 1999 04:17:07:967PM	990908017	Steve Wolfe	Shot #17: Don't ramp CLEARIN in as much after 1.7 sec. Eric removed the feedforward jumper from the the control on #1. plasma, same length. Short H-modes 1-1.17sec
Sep 8 1999 04:37:51:903PM	990908018	Steve Wolfe	Shot #18: No PCS changes plasma, h-modes, D~.5MW, J3 faulting, J4~.8MW Little hard xray dump early (.14sec)
Sep 8 1999 04:49:17:233PM	990908019	Steve Wolfe	Shot #19: No PCS changes (resist the temptation to tweak Bz) plasma, h-modes, hard xrays are gone. D~.6, J3 still tripping, J4 to .8MW Next shot: Extend TF flattop to 1.6 sec
Sep 8 1999 05:20:40:140PM	990908020	Steve Wolfe	Shot #20: Extend TF flattop to 1.6 sec (last attempt to extend rampdown past 1.9sec) NOTE: DO NOT USE THIS SHOT AS STARTING POINT FOR TOMORROW. Early disruption; big injection at 0.17sec almost kills it, then a second one at .47 finishes it off. Didn't make it to the RF.
Sep 9 1999 08:52:01:123AM	990908020	Jim Terry	Based on observation of the Na-like Fe and Ni lines at 335.5 A and 320.5 respectively, the problems on this shot seem to be due to Fe and Ni influx. It was not Mo.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:50:15:357AM	Test	Bad	OH2 OK OH1 no I program
2	08:58:37:670AM	Test	Ok	Question on OH2 Upper Cal
3	09:54:06:233AM	Test	Ok	(null)
4	10:42:15:263AM	Plasma	Ok	no faults/plasma
5	12:04:36:013PM	Plasma	Ok	no faults
6	12:38:08:763PM	Plasma	Ok	(null)
7	01:01:49:857PM	Plasma	Ok	(null)
8	01:23:01:250PM	Plasma	Ok	(null)
9	01:41:00:623PM	Plasma	Ok	no faults
10	02:01:31:780PM	Plasma	Ok	(null)
11	02:19:31:827PM	Plasma	Ok	(null)
12	02:39:00:750PM	Plasma	Ok	(null)
13	02:54:10:107PM	Plasma	Ok	(null)
14	03:12:04:170PM	Plasma	Ok	(null)
15	03:30:01:857PM	Plasma	Ok	(null)
16	03:48:59:547PM	Plasma	Ok	(null)
17	04:08:19:623PM	Plasma	Ok	(null)
18	04:25:00:250PM	Plasma	Ok	(null)
19	04:44:26:903PM	Plasma	Ok	(null)
20	05:01:33:763PM	Plasma	Ok	(null)