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 1-19)

Engineering Operator Run Comment

MP#214 RF Conditioning/Irby/Silva

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Physics Operator Summaries

Entered: Jul 7 2004 04:37:07:910PM

Author: To Be Determined

990730: MP214 -- RF conditioning EO - Cochran, Dekow, Silva PO - Irby SL - Wukitch Run Plan: Start by loading 990527003 and make changes in equilibrium as necessary to satisfy the RF group. If early disruptions continue to be a problem, try backing off on Ip to 0.7 MA. After an up-to-helium on 7/28, ECDC in D2 and a bake at 55C was begun on 7/29, and continued until approx 0400 on 7/30. Results: The main result from Friday's run was that we no longer have Fe showing up in the plasma. So we can assume that we did fix the problem with the up-to-air. However, the vacuum and wall conditions were simply not adequate to get good plasma. The water levels on the RGA were very high all day and were not dropping. Mass 17,18, and 19 in fact composed nearly the whole basepressure. Plasmas lasting a maximum of 250 ms were produced before the impurity levels terminated the discharge, usually after a burst of hard x-rays. Many tweeks were tried to get full length discharges that may then have helped clean up the machine. Both the c-side and pre-fill gas levels were adjusted, EF4 currents were adjusted by 15 amps or so to better null Bz0, a small Br0 tweek was done early in the run, and for a few shots we tried reducing the current request from 800 to 450 kA to reduce the drive. None of these changes allowed up to "break through" to a full length shot. Operation should be much better next week after several days of ECDC and a 55 C bake. Problems: TF2 breaker had to be replaced after shot 1 A river water inlet temp of 76F required a 20 minute shot cycle to keep alternator temp in bounds. An attempt to adjust engineering parameter on shot 2 after INIT resulted in the loss of one shot. This problem should be fixed with a software mod to lockout changes after initialization has begun. We lost some magnetics data on shot 4. Score: test/eng problem 2 fizzles 6 plasmas 11

Session Leader Comments
Jul 30 1999 09:26:51:513AM		Rejean Boivin	RF conditioning (MP 214) We will continue our conditioning. XMTR 1 and 2 (D and E) should come on rapidly to full available power. XMTR3 and 4 will be brought online in parallel and we will atempt to run them together with significant power. Phase between 3 and 4 will also be diagnosed. PLasma conditions should remain mostly the same with some tweaking in gaps, H conc and so forth.

Physics Operator Comments
Jul 30 1999 07:37:46:200AM		Jim Irby	Did Hybrid cold start at 07:30
Jul 30 1999 07:40:45:450AM		Jim Irby	Loaded shot 990727003 into PCS
Jul 30 1999 09:24:41:250AM	990730001	Jim Irby	Tuesday OH Test All okay, 1,2u,2l, .22, .19, .19
Jul 30 1999 10:46:39:513AM	990730002	Jim Irby	First shot after break to fix TF2 breaker Didn't get engineering file updated before INIT. Didn't have ef2u, ef3s, or ef4s. OH2s tried to take care of the asymmetry.
Aug 1 1999 02:24:15:670PM	990730003	Jim Irby	fizzle
Jul 30 1999 11:44:00:233AM	990730004	Jim Irby	Plasma lasted about 0.135 s
Jul 30 1999 11:48:34:543AM	990730005	Jim Irby	fizzle fields look okay
Jul 30 1999 11:59:17:233AM	990730006	Jim Irby	reduced gas puff by .002 seconds ( end-of-pulse from -0.500 to -0.502)
Jul 30 1999 12:16:42:967PM	990730007	Jim Irby	Reduced br_o offset from .005 to .004 Reduced gas pulse by .002 ms ( -0.502 to -0.504)
Jul 30 1999 12:44:11:577PM	990730007	Jim Irby	Almost 150 ms plasma CII getting lower High desity earlly
Jul 30 1999 12:46:50:060PM	990730008	Jim Irby	No changes from shot 007
Jul 30 1999 12:58:42:200PM	990730008	Jim Irby	longer plasma, > 150 ms
Jul 30 1999 01:16:40:857PM	990730009	Jim Irby	added 15 amps to ef4 ( -1275 to -1260 amps) Only about 130 ms of plasma. Current started down after only 100 ms or so.
Jul 30 1999 01:40:15:733PM	990730010	Jim Irby	Reduced c_side early gas by about 15% (depending on how linear the gas valve is). Plasma for 215 ms. Abt 550 kA peak current Loop voltage down to 4 volts
Jul 30 1999 02:12:36:217PM	990730011	Jim Irby	Reduced early gas again from 55 volts to 45 volts. Last shot was from 65 to 55. fizzle
Jul 30 1999 02:31:14:297PM	990730012	Jim Irby	no changes plasma for about 150 ms, 400 kA
Jul 30 1999 02:45:48:030PM	990730013	Jim Irby	Current request to 450,000 kA from 800,000 kA Almost 250 ms of plasma, 2 volts, 550 kA
Jul 30 1999 03:05:58:327PM	990730014	Jim Irby	No changes from 013 fizzle
Jul 30 1999 03:30:29:310PM	990730015	Jim Irby	no changes form 014 plasma for about 195 ms, 480 kA bp about 3.1e-7
Jul 30 1999 03:50:20:077PM	990730016	Jim Irby	dropped c_hor gas puff again from 45 to 35 volts. fizzle
Jul 30 1999 04:21:25:357PM	990730017	Jim Irby	moved ef4 current from -1260 to -1270 amps. plasma for 165 ms, 500 kA
Jul 30 1999 04:36:45:750PM	990730018	Jim Irby	ef4s to -1275 from -1270 plasma for 260 ms, 550 kA
Jul 30 1999 04:56:53:030PM	990730019	Jim Irby	current request to 600 kA plasma for 213 ms, current to 600 kA

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:20:49:420AM	Test	Ok	oh 10KA test oK
2	10:38:41:340AM	Plasma	Bad	All supplies not turned on. Bad to go on with shot/ control pane;l was r
3	11:01:36:623AM	Plasma	Ok	no faults
4	11:22:30:433AM	Plasma	Ok	no faults
5	11:42:55:170AM	Plasma	Ok	no faults
6	12:06:45:140PM	Plasma	Ok	no faults
7	12:27:02:153PM	Plasma	Ok	(null)
8	12:47:15:343PM	Plasma	Ok	(null)
9	01:12:10:607PM	Plasma	Ok	(null)
10	01:33:22:250PM	Plasma	Ok	(null)
11	01:57:26:607PM	Plasma	Ok	(null)
12	02:18:19:560PM	Plasma	Ok	(null)
13	02:40:03:730PM	Plasma	Ok	(null)
14	03:01:51:280PM	Plasma	Ok	(null)
15	03:25:29:793PM	Plasma	Ok	(null)
16	03:45:52:513PM	Plasma	Ok	(null)
17	04:09:34:653PM	Plasma	Ok	(null)
18	04:30:07:967PM	Plasma	Ok	(null)
19	04:53:10:373PM	Plasma	Ok	(null)