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 1-16) Session Leader: Steve Wukitch (shots 1-16)

Engineering Operator Run Comment

Inserted by hand (jas)

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Physics Operator Summaries

Entered: Jul 7 2004 04:37:08:787PM

Author: To Be Determined

Run Plan and Engineering Setup forThursday, August 26 1999. SL: Wukitch/Schilling PO: Parker This run will be a replay of that scheduled for Tuesday, August 24, 1999. The general purpose will be to condition the RF antennas. The run is scheduled to start at 12:00 and end at 18:00. The initial setup will be the same as that for shot 990824002. As planned for Tuesday, we will try to bring up E-port/FMIT#2 system. If successful, compare heating and impurity behavior with J port antenna. During the run, we will try to optimize heating from both antennas. Engineering setup: Two hours ECDC in D2 Setup power supplies from 990824002 Gas setup: Same as for 990824002 The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV Run Summary: The run was successful from the Phys Ops viewpoint. It began at 12:00 and ended at 18:00. The main purpose was to condition the J-Port antenna, and the plasma shots were not particularly challenging--5.1T, ~ 1 MA, and n ~ 1.0e20. It seems that J-Port antenna still produces copius impurities which can lead to H-Mode termination or disruption. In fact, the last three shots disrupted even though Transmitter 3 either did not pulse or terminated early and Trans- mitter 4 was operated at only 700 kW. The machine ran well, other than the disruptions which were presumably due to the RF. There was one fizzle, which was probably due to a drift in BR to about -1.5 mT. When corrected to BR ~ -0.5 mT, the shot was recovered and no further problems were encountered. At total of 16 shots were produced, with one fizzle and 5 disruptions. There were numerous power room interventions which accounts for the somewhat low shot rate.

Session Leader Comments
Aug 26 1999 12:32:01:590PM	990826001	Steve Wukitch	001 plasma no RF
Aug 26 1999 12:32:25:763PM	990826001	Steve Wukitch	next shot: start J-port 0.6 to 1.3 sec ramped to 1.2 MW E-port 1.0-1.3 ramped to 1 MW
Aug 26 1999 12:51:58:263PM	990826002	Steve Wukitch	002 plasma EDA FMIT#2 0.8 MW FMIT#3 faulted FMIT#4 0.6 MW next shot: repeat with different phase and retune
Aug 26 1999 02:43:13:967PM	990826003	Steve Wukitch	003 plasma EDA FMIT#2 ramped 1.25 MW FMIT#3 did not reset FMIT#4 ramped to 0.6 MW next shot: reset #3 and raise power on #2 to verify power limit
Aug 26 1999 02:44:14:123PM	990826004	Steve Wukitch	004 plasma EDA FMIT#2 ramped to 1.4 MW before screen overcurrent FMIT#3 did not reset FMIT#4 ramped to 0.8 MW
Aug 26 1999 02:50:58:483PM	990826005	Steve Wukitch	005 plasma EDA with all three and ELM-free with J only FMIT#2 ramped to 1.4 MW FMIT#3 ran with a faults FMIT#4 ran with a faults next shot: change #2 to run from .58-1.3 and repeat
Aug 26 1999 02:50:42:030PM	990826006	Steve Wukitch	006 plasma two H-modes FMIT#2 overloaded FMIT#3 ran without faults FMIT#4 ran without faults next shot: lower #2 more to avoid overload and move J to 0.7-1.3
Aug 26 1999 03:12:14:780PM	990826007	Steve Wukitch	007 plasma EDA FMIT#2 overloaded late but it should not have - perhaps a problem FMIT#3 good ramp FMIT#4 good ramp next shot: #2 at 1 MW with J squared to 1 MW
Aug 26 1999 03:28:35:873PM	990826008	Steve Wukitch	008 plasma multiple H-modes good fiducial next shot: repeat with E on from 0.5-1.3 MW
Aug 26 1999 04:16:37:250PM	990826009	Steve Wukitch	009 plasma disruption at ~1.1 sec E-port pulled out without an understood reason next shot: E-port is off for the remainder 1 MW on J from 0.6-1.3 sec
Aug 26 1999 04:15:15:437PM	990826010	Steve Wukitch	010 plasma multiple H-modes good 1 MW next shot: repeat with 1.5 MW on J
Aug 26 1999 04:52:58:327PM	990826012	Steve Wukitch	012 plasma FMIT#3 faulted off early next shot: repeat
Aug 26 1999 05:23:57:233PM	990826013	Steve Wukitch	13 plasma #3 did not reset next shot: repeat with additional instrumentation on #3

Physics Operator Comments
Aug 26 1999 12:42:02:607PM	990826002	Ron Parker	Shot 990826002 For this shot, the density was lowered slightly to 1.0e14. Also, RF was turned on, producing an H-Mode when E-port antenna was energized. Density rose to 2e14.
Aug 26 1999 01:01:27:560PM	990826003	Ron Parker	Shot 990826003 Continuing with same shot, no changes except RF. Rf peak power ~ 2 MW.
Aug 26 1999 01:30:27:827PM	990826004	Ron Parker	Shot 990826004 Shot ran as programmed. Problem with transmitter 3, so only half of J-port antenna was energized. Power room intervention required to fix, delay likely to be of order 1 hr.
Aug 26 1999 02:16:45:187PM	990826005	Ron Parker	Shot 990826005 After some delay, ~ 1/2 hour to fix transmitter 3, shot ran well without changes. On next shot flaps will be open for the entire shot. For shots 1-5 flaps have been closed.
Aug 26 1999 02:36:44:280PM	990826006	Ron Parker	Shot 990826006 Shot ran as previous shots without change. RCUR was extended to be constant during rampdown beginning with last shot (990826005). No effect during flatop, but current at rampdown disruption reduced. J. Irby requested and was granted cell access to tune laser.
Aug 26 1999 03:01:42:483PM	990826007	Ron Parker	Shot 990826007 Shot ran well, as has been the case all day (so far!) Flappers were closed for that shot, in case anyone noticed.
Aug 26 1999 03:18:06:967PM	990826008	Ron Parker	Shot 990826008 Same shot, no changes (except flappers were open. For next several shots flappers will alternate open and closed with successive shots.) RF programming different on J-Port. Constant power rather than ramp.
Aug 26 1999 03:46:40:327PM	990826009	Ron Parker	Shot 990826009 Shot disrupted at ~1.1 s, due to sudden rise in radiated power. Rf power was only ~ 1 MW from J-Port. E-Port transmitter had tripped out early (~.55 s). RF Group requested and was granted power room access.
Aug 26 1999 04:16:44:793PM	990826010	Ron Parker	Shot 990826010 E-port transmitter (#2) is finished for the day. During the remainder of the run, only J-port will be energized, as in this shot. Shot shows periodic transition into H-mode, with transitions out apparently caused by impurity accumulation.
Aug 26 1999 04:37:51:357PM	990826011	Ron Parker	Shot 990826011 Fizzle. BR appears to be too negative, -1.5 mT. 1 mT added to BR program.
Aug 26 1999 04:58:28:390PM	990826012	Ron Parker	Shot 990826012 Shot recovered. RF transmitter 3 tripped out early. Transmitter 4 produced ~0.6 MW, but plasma nevertheless disrupted near inversion. BR signal didn't update properly, nor did loop voltage. SW looking into it.
Aug 26 1999 05:10:23:700PM	990826013	Ron Parker	Shot 990826013 Shot ran as programmed, but transmitter 3 did not turn on. Transmitter 4 stayed on at 700 kW, but did not produce H-Mode.
Aug 26 1999 05:31:08:937PM	990826014	Ron Parker	Shot 990826014 Shot disrupted at ~ 0.95 s. Transmitter 3 shut itself off after reaching about 0.8 MW.
Aug 26 1999 05:59:11:233PM	990826015	Ron Parker	Shot 990826015 Shot disrupted at ~ 1.2 s. Transmitter 3 did not pulse. Transmitter 4 delivered ~ 700 kW, did not produce an H-Mode.
Aug 26 1999 06:06:20:090PM	990826016	Ron Parker	Shot 990826016 Shot disrupted again, this time at 0.7 s Transmitter 4 delivered ~ 700 kW, no pwer from T3.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	12:29:24:623PM	Plasma	Ok	Inserted by hand (jas)
2	12:33:02:437PM	Plasma	Ok	(null)
3	12:52:15:873PM	Plasma	Ok	(null)
4	01:09:10:623PM	Plasma	Ok	(null)
5	02:10:10:030PM	Plasma	Ok	(null)
6	02:28:45:560PM	Plasma	Ok	(null)
7	02:53:27:670PM	Plasma	Ok	(null)
8	03:10:20:717PM	Plasma	Ok	(null)
9	03:30:05:357PM	Plasma	Ok	(null)
10	04:08:01:763PM	Plasma	Ok	(null)
11	04:26:14:437PM	Plasma	Ok	(null)
12	04:40:59:077PM	Plasma	Ok	(null)
13	05:01:31:530PM	Plasma	Ok	(null)
14	05:23:14:250PM	Plasma	Ok	(null)
15	05:39:53:653PM	Plasma	Ok	(null)
16	06:00:45:750PM	Plasma	Ok	(null)