Miniproposals

Miniproposal: Date Filed: Title: First Author: Session Leader: Steve Wukitch (shots 1-10)

Miniproposal: 289a Date Filed: 5/2/2001 Title: Investigations of Double Transport Barrier Plasmas First Author: John Rice Session Leader: John Rice (shots 1-10)

Engineering Operator Run Comment

Continuation of MP289A PO Parker SL Rice,WukitchEO Fitzgerald,Parkin

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:27:803PM

Author: To Be Determined

Run Plan and Engineering Setup for Wednesday, July 25 Continuation of MP289A SL: Rice, Wukitch PO: Parker ECDC in D2 overnight, stopping 2 hours before the run Run Begins at 9:00 and ends at 17:00 Power systems setup the same as for Shot 1010724001 Gas setup: B-Top 6 psi D2 Hybrid Enabled (PG4) B-side lower 1 psi Ar Hybrid Enabled (PG1) B-side upper 10 psi D2 Hybrid DISABLED (PG2, for ECDC) C-Side 30 psi D2 Hybrid Enabled (PG3) J-Bottom 6 psi He Hybrid DISABLED (PG5) Enable the following gate valves, assuming no vacuum problems: ECE, DNB, VUV RF Status: XMTR 1 and 2, RUN-ON Started at 8:00 XMTR 3 and 4, RUN-ON Started at 8:00 RUN PLAN: MP289A (Continued from 1010723)). ITB studies, running constant discharges varying only the timing and power level of the J-Port 70 MHz antenna. The goal is to arrest the development of the ITB and to determine how to control it. 001 request: reload from 1010724010 Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 1.5 MW @ [1.1,1.5] sec result: plasma but no H-mode - no ITB Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW after initial hesitation on D-port 70 MHz: faulted next shot: move 70 MHz to [.9,1.5] sec 002 request: Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 1.5 MW @ [1.1,1.5] sec result: plasma - early disruption nice ITB Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 0 MW @ [1.1,1.5] sec J-port is reporting J3DC1 faults 003 request: Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 1.5 MW @ [1.1,1.5] sec result: no power supplies 004 request: Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 1.5 MW @ [1.1,1.5] sec result: - 005 request: Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 1.5 MW @ [1.1,1.5] sec result: plasma early H->L Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 0 MW @ [1.1,1.5] sec 006 request: Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 1.5 MW @ [1.1,1.5] sec result: plasma - early disruption early H->L Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 0 MW @ [1.1,1.5] sec 007 request: Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 1.5 MW @ [1.1,1.5] sec result: plasma - early disruption nice ITB Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 0.05 MW @ [1.1,1.5] sec 008 request: Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 1.5 MW @ [1.1,1.5] sec result: plasma - early disruption H->L transition 0.95 sec Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 0.05 MW @ [1.1,1.5] sec 009 request: Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 1.5 MW @ [1.1,1.5] sec result: plasma - early disruption H->L transition 0.95 sec Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 1.5 MW @ [1.1,1.5] sec next shot: 80 MHz: 2 MW @ [0.6,1.5] sec 70 MHz: 1.5 MW @ [.8,1.5] sec 010 request: raise density 10% Ip~0.7 MA, BT~4.5 T 80 MHz: 2 MW @ [0.6,1.5] sec 70 MHz: 1.5 MW @ [.8,1.5] sec result: plasma - early disruption H->L transition 0.95 sec Ip~0.7 MA, nl_04~1, BT~4.5 T 80 MHz: 2 MW @ [0.7,1.5] sec 70 MHz: 1.5 MW @ [1.1,1.5] sec next shot: 80 MHz: 2 MW @ [0.6,1.5] sec 70 MHz: 1.5 MW @ [.8,1.5] sec Summary: The run was terminated after shot 010 due to high temperatures in the power room and cell. With D and E-port only, a nice ITB was formed in shot 002. Not much progress was made on the physics front since J-port did not begin to operate until 010 and the plasmas often had an early H->L transition.

Physics Operator Summaries

Entered: Jul 7 2004 04:37:14:147PM

Author: To Be Determined

Run Plan and Engineering Setup for Wednesday, July 25 Continuation of MP289A SL: Rice, Wukitch PO: Parker ENGINEERNG SETUP: ECDC in D2 overnight, stopping 2 hours before the run Run Begins at 9:00 and ends at 17:00 Power systems setup the same as for Shot 1010724001 Gas setup: B-Top 6 psi D2 Hybrid Enabled (PG4) B-side lower 1 psi Ar Hybrid Enabled (PG1) B-side upper 10 psi D2 Hybrid DISABLED (PG2, for ECDC) C-Side 30 psi D2 Hybrid Enabled (PG3) J-Bottom 6 psi He Hybrid DISABLED (PG5) Enable the following gate valves, assuming no vacuum problems: ECE, DNB, VUV RF Status: XMTR 1 and 2, RUN-ON Started at 8:00 XMTR 3 and 4, RUN-ON Started at 8:00 RUN PLAN: MP289A (Continued from 1010723)). ITB studies, running constant discharges varying only the timing and power level of the J-Port 70 MHz antenna. The goal is to arrest the development of the ITB and to determine how to control it. RUN SUMMARY: The run began with shot 1010724017, which ran well. However, this shot had a little hesitation in the current rise around 15 ms. The PO tuned BR(0) and BZ(0) in an attempt to smooth out the current rise. Although initial fields were in the range predicted by Jim's histogram to be favorable for startup, the tuning ultimately resulted in a dud on shot 4. Just prior to that, there had been a no plasma shot on shot 3, but here the problem was failure of power supplies to turn on, rather than an error field problem. On investigation, it turned out that segment 1 was off! The PO had no idea how this happened, but it did and this caused shot 3 to be a no-plasma shot. After the dud in shot 4, shot 1 was reloaded and shots 5-10 started up and generally ran well. In fact, breakdown was good, occuring at 5 ms. The glitch that occurred in the current ramp might have been cured by slowing down the ramp rate by increasing the fill pressure, but this was not tried since the shots were running well and producing useful data. During mid-afternoon, temperatures in the control room and cell were ~ 100 degrees (F), and data acquisition systems were failing. There was a delay while the possibility to fix the AC was assessed, after which it was determined that if the AC could be fixed, operations would resume at 4:00, at the earliest, leaving only ~ 3 more shots. Therefore it was decided to scuttle the run, and use the time for maintenance. The weather is predicted to be significantly cooler for 7/26/01 and an extended run is planned. So the scorecard is: 1 dud, 1 PO error and 8 shots that ran as programmed.

Session Leader Comments
Jul 25 2001 11:15:39:970AM	1010725001	John Rice	D and E only, no H=mode, no ITB
Jul 25 2001 11:27:11:453AM	1010725002	John Rice	D and E only, great ITB
Jul 25 2001 12:22:41:877PM	1010725003	John Rice	dud, timing problem
Jul 25 2001 12:22:49:970PM	1010725004	John Rice	dud
Jul 25 2001 01:00:09:797PM	1010725005	John Rice	ITB, but H-L at 0.9 s no J port
Jul 25 2001 01:00:16:780PM	1010725006	John Rice	ITB, but H-L at 0.9 s no J port
Jul 25 2001 01:32:47:083PM	1010725007	John Rice	ITB, but H-L at 0.9 s no J port
Jul 25 2001 01:33:00:097PM	1010725008	John Rice	ITB, but H-L at 0.9 s no J port
Jul 25 2001 01:59:14:490PM	1010725009	John Rice	ITB, but H-L at 0.9 s good J port
Jul 25 2001 02:19:14:683PM	1010725010	John Rice	ITB, good J port, disrupted at 1.05 s

Physics Operator Comments
Jul 25 2001 11:13:23:843AM	1010725001	Ron Parker	Run was delayed for 1.5 hours due to problems caused by heat. First shot loaded is 1010724017 Shot 1 ran OK, with somewhat delayed startup. No F side pressure signal. It could be that the fill pressure is a bit high. Next: Repeat of shot 1
Jul 25 2001 11:51:51:683AM	1010725002	Ron Parker	Shot 2 ran well with good startup. Barrier formed. Next: No changes except tweaking of startup settings. Short delay due to Temperature instrumentation problem.
Jul 25 2001 12:19:05:403PM	1010725003	Ron Parker	No plasma due to failure of power supplies to turn on. Problems with hybrid? Problem turned out to be that segment 1 was not turned on -- why is a mystery! Try again, same plasma as in shot 2.
Jul 25 2001 12:34:37:407PM	1010725004	Ron Parker	Shot 4 was a dud, in violation of what would have been expected from Jim's histogram. Next shot: Try again, with startup for shot 1 loaded.
Jul 25 2001 01:08:23:710PM	1010725005	Ron Parker	Shot ran again, similar to shot 1.
Jul 25 2001 01:11:20:777PM	1010725006	Ron Parker	Shot 6 ran again as programmed. Cell entry granted for RF. No changes for next shot.
Jul 25 2001 01:24:42:200PM	1010725007	Ron Parker	Shot 7 ran well, similar to shots 5 and 6. The startup is a little ugly, with a hesitation in the current ramp. But this will be ignored as long as it recovers and the shots run as programmed. Next shot: Repeat
Jul 25 2001 01:41:26:390PM	1010725008	Ron Parker	Shot 8 ran again as programmed. No changes for next shot
Jul 25 2001 01:59:10:580PM	1010725009	Ron Parker	Shot 9 ran similar to previous shots, no changes having been made. The current rampup still has a bump in it, but the shot reaches it programmed value.
Jul 25 2001 03:13:19:323PM	1010725010	Ron Parker	For shot 10, the density was increased to 1.1e20. Plasma disrupted at 1.05 s. Earl claimed it was not due to Li pellet injector, for which the gate valve was just enabled. At this point in the run, the temperature in the cell and control room had reached ~ 100 degrees, resulting in failures in the data aquisition system. After a delay to assess the possibility to fix the air conditioning, the prospects to get further useful data were dim and it was decided to scuttle the run (at ~ 3:00 PM)

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	10:55:01:743AM	Plasma	Ok
2	11:16:46:300AM	Plasma	Ok
3	12:05:13:217PM	Plasma	Ok
4	12:20:52:873PM	Plasma	Ok
5	12:35:45:517PM	Plasma	Ok
6	12:54:21:773PM	Plasma	Ok
7	01:16:42:143PM	Plasma	Ok
8	01:29:13:703PM	Plasma	Ok
9	01:49:20:540PM	Plasma	Ok
10	02:09:02:093PM	Plasma	Ok