Miniproposals

Miniproposal: Date Filed: Title: First Author: Session Leader: Martin Greenwald (shots 1-36)

Engineering Operator Run Comment

silva/bertolino/daigle

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:12:333PM

Author: To Be Determined

Summary for Run 950302 - Dimensionless Scaling Comparisons M. Greenwald Run Plan -------- The basic outline of the run are power scans at two fixed densities - nebar = 1.5 and 3.0 e20 (nel ~ .9 and 1.8). The other conditions are R= .67, a = .22, kappa = 1.65, Ip = 1.02 with a SNB equilibrium. Inner and outer gaps should be about 1 cm. We start with shot 950301026, with the current nudged down to 1 MA. We tweak the density and equilibrium as needed from there. We start with the lower density. Once the equilibrium and density are established we should start increasing the RF power to its maximum value. Steps of .5 MW are probably appropriate. The RF waveform should be a simple square wave, the pulse length should cover most of the flattop. When we reach the maximum power at ne = 1.5, we will raise the density to 3.0 and repeat the power scan. ................ Not a great day. Lots of fizzles and disruptions. The E Port transmitter/antenna worked well but there is still a problem with the D port system. Thus RF power was limited to about 1.8 MW. All the shots were at 1.0 MA, nebar = 1.5 e20, kappa = 1.7, we never got to the higher density. Good shots were 950302006 Prf = 0 950302008 Prf = 0 950302010 Prf = 0.8 MW 950302017 Prf = 0.5 MW 950302019 Prf = 0.5 MW 950302020 Prf = 1.1 MW 950302024 Prf = 1.1 MW 950302025 Prf = 1.8 MW 950302027 Prf = 1.5 MW 950302029 Prf = 1.6 MW ------------------------------------------------------------------------- Details: SHOT: 950302001 Fizzle SHOT: 950302002 Good startup but ends at .14 seconds SHOT: 950302003 Lasts to .5 sec, .9 MA SHOT: 950302004 fizzle SHOT: 950302005 fizzle SHOT: 950302006 Reaches to end of flattop Ip = 1.0 MA nl = 1e20 SHOT: 950302007 Fizzle SHOT: 950302008 Made it through flattop Ip = 1.0 MA nel = 1.0 e20 SHOT: 950302009 fizzle SHOT: 950302010 Ip = 1.0 MA nel = 1.0 e20 PRF = .8 MA (slightly more than we wanted) disrupts at the start of rampdown SHOT: 950302011 Fizzle SHOT: 950302012 fizzle SHOT: 950302013 fizzle SHOT: 950302014 reached flattop, disrupted at 0.7 sec Ip = 1.0 nel = 1.0 e20 SHOT: 950302015 fizzle SHOT: 950302016 fizzle SHOT: 950302017 Lasted to end of flattop Ip = 1.0 nel = 1.0e20 Prf = 0.5MW SHOT: 950302018 fizzle SHOT: 950302019 Good shot - last through ramp down Ip = 1.0 MA nel = 1e20 Prf = .5 MW SHOT: 950302020 Disrupts at beginning of rampdown Ip = 1.0 MA nel = 1e20 Prf = 1.1 MW SHOT: 950302021 fizzles SHOT: 950302022 Disrupts early SHOT: 950302022 fizzles SHOT: 950302023 fizzle SHOT: 950302024 Good Shot - full ramp down Ip = 1.0 MA nel = 1.0 e20 Prf = 1.1 MW SHOT: 950302025 Disrupts at the beginning of rampdown Ip = 1.0 MA nel = 1.0 e20 Prf = 1.8 MW SHOT: 950302026 fizzle SHOT: 950302027 Good Shot Prf = 1.5 MW nel = 1e20 Ip = 1.0 MW SHOT: 950302028 Fizzle SHOT: 950302029 Disrupts during rampdown Ip = 1.0MA nel = 1.0e20 Prf = 1.5-1.8 MW SHOT: 950302030 fizzle SHOT: 950302031 disruptions, runaways, etc. SHOT: 950302032 on current ramp up

Physics Operator Summaries

Entered: Jul 7 2004 04:36:53:397PM

Author: To Be Determined

MP085 (MOD) Dimensionless Scaling Comparison with DIII-D Engineer in Charge: Vinny Bertolino Physicist in Charge: Joseph Snipes Session Leaders: Martin Greenwald and J. DeBoo Started by copying shot 950301026 but with Ip = 1 MA and nel = 9 x 10^19 m^-2 (about 1.5 x 10^20 m^-3). Intent is to run high power ICRF in a standard SNB equilibrium with kappa = 1.65 and about 1 cm inner and outer gaps for two densities (1.5 x 10^20 m^-3 and 3.0 x 10^20 m^-3). The run did not go very well being plagued with fizzles and disruptions. The power supplies ran very well though. Nonetheless some useful shots were obtained at the lower density. Two attempts at high density failed before the RF could do very much. There were also problems with startup in that too little gas led to runaways and disruptions but faster current rise, while too much gas reduced the rate of rise of the current. Shot 1: Fizzle 2: EFC failed at 0.1 sec, plasma disrupted vertically 3: Disruption at 0.52 sec. 4: Fizzle 5: Fizzle 6: Good shot. Disrupted in rampdown. 7: Fizzle 8: Good shot. Disrupted in rampdown 9: Fizzle 10: Good shot. RF at 0.8 MW from 0.7-1.1 sec. Disrupted in rampdown 11: Fizzle 12: Fizzle 13: Fizzle 14: Disrupted at 0.7 sec. 15: Fizzle 16: Fizzle 17: Good shot. Disrupted in rampdown. 18: Fizzle 19: Good shot! Ramped all the way down. 20: Good shot. Disrupted at 1.17 sec 21: Fizzle 22: Runaway discharge disrupted before 0.5 sec 23: Fizzle 24: Good shot RF up to 1.2 MW ramped down to 1.5 sec. 25: Good shot, RF up to 1.9 MW, disrupted at 1.0 sec. 26: Fizzle 27: Good shot. RF up to 1.5 MW, ramped down to 1.49 sec 28: Fizzle 29: Good shot. RF up to 1.7 MW, disrupted at 1.2 sec 30: Fizzle 31: Runaway discharge. Disrupted at 0.43 sec 32: Some runaways. Disrupted at 0.53 sec 33:

Session Leader Comments
Mar 2 1995 08:50:54:460AM	950302001	Martin Greenwald	Fizzle
Mar 2 1995 09:09:37:570AM	950302002	Martin Greenwald	Good startup but ends at .14 seconds
Mar 2 1995 09:30:26:250AM	950302003	Martin Greenwald	Lasts to .5 sec, .9 MA
Mar 2 1995 09:42:26:680AM	950302004	Martin Greenwald	Dud
Mar 2 1995 09:59:43:000AM	950302005	Martin Greenwald	fizzle
Mar 2 1995 10:24:03:150AM	950302006	Martin Greenwald	Reaches to end of flattop Ip = 1.0 MA nl = 1e20
Mar 2 1995 10:34:52:740AM	950302007	Martin Greenwald	Fizzle
Mar 2 1995 10:51:03:430AM	950302008	Martin Greenwald	Made it through flattop Ip = 1.0 MA nel = 1.0 e20
Mar 2 1995 11:06:14:210AM	950302009	Martin Greenwald	fizzle
Mar 2 1995 11:25:05:580AM	950302010	Martin Greenwald	Ip = 1.0 MA nel = 1.0 e20 PRF = .8 MA (slightly more than we wanted) disrupts at the start of rampdown
Mar 2 1995 11:36:53:560AM	950302011	Martin Greenwald	Fizzle
Mar 2 1995 11:45:58:960AM	950302012	Martin Greenwald	fizzle
Mar 2 1995 11:54:06:420AM	950302013	Martin Greenwald	fizzle
Mar 2 1995 12:06:14:400PM	950302014	Martin Greenwald	reached flattop, disrupted at 0.7 sec Ip = 1.0 nel = 1.0 e20
Mar 2 1995 12:14:43:300PM	950302015	Martin Greenwald	fizzle
Mar 2 1995 12:28:22:820PM	950302016	Martin Greenwald	fizzle
Mar 2 1995 12:56:32:250PM	950302017	Martin Greenwald	Lasted to end of flattop Ip = 1.0 nel = 1.0e20 Prf = 0.5MW
Mar 2 1995 01:10:48:080PM	950302018	Martin Greenwald	fizzle
Mar 2 1995 01:39:14:360PM	950302019	Martin Greenwald	Good shot - last through ramp down Ip = 1.0 MA nel = 1e20 Prf = .5 MW
Mar 2 1995 01:45:16:370PM	950302020	Martin Greenwald	Disrupts at beginning of rampdown Ip = 1.0 MA nel = 1e20 Prf = 1.1 MW
Mar 2 1995 01:57:21:330PM	950302021	Martin Greenwald	fizzles
Mar 2 1995 02:50:08:090PM	950302022	Martin Greenwald	Disrupts early
Mar 2 1995 02:50:29:740PM	950302022	Martin Greenwald	fizzles
Mar 2 1995 03:01:40:620PM	950302023	Martin Greenwald	fizzle
Mar 2 1995 02:42:30:460PM	950302024	Martin Greenwald	Good Shot - full ramp down Ip = 1.0 MA nel = 1.0 e20 Prf = 1.1 MW
Mar 2 1995 02:49:31:220PM	950302025	Martin Greenwald	Disrupts at the beginning of rampdown Ip = 1.0 MA nel = 1.0 e20 Prf = 1.8 MW
Mar 2 1995 02:58:57:590PM	950302026	Martin Greenwald	fizzle
Mar 2 1995 03:19:45:470PM	950302027	Martin Greenwald	Good Shot Prf = 1.5 MW nel = 1e20 Ip = 1.0 MW
Mar 2 1995 03:50:33:450PM	950302028	Martin Greenwald	Fizzle
Mar 2 1995 04:06:43:600PM	950302029	Martin Greenwald	Disrupts during rampdown Ip = 1.0MA nel = 1.0e20 Prf = 1.5-1.8 MW
Mar 2 1995 04:34:49:230PM	950302030	Martin Greenwald	fizzle
Mar 2 1995 04:35:07:040PM	950302031	Martin Greenwald	disruptions, runaways, etc.
Mar 2 1995 04:46:28:530PM	950302032	Martin Greenwald	disrupts on current ramp up

Physics Operator Comments
Mar 2 1995 08:38:13:590AM		Joseph Snipes	Dimensionless scaling run to compare with DIII-D MP085 (MOD) Starting with shot 950301026 but with Ip = 1.0 MA and nel = 9 x 10^19 m^-2. Intend to run at highest possible ICRF power at two separate densities of 1.5 x 10^20 m^-3 and 3.0 x 10^20 m^-3 with SNB equilibrium, kappa = 1.65, and about 1 cm inner and outer gaps.
Mar 2 1995 08:40:06:440AM	950302001	Joseph Snipes	Copied shot 950301026 with Ip lowered to 1.0 MA and nel lowered to 9 x 10^19 m^-2. Prefill set to 2.0 x 10^-5 Torr. Fizzle!
Mar 2 1995 09:08:42:970AM	950302002	Joseph Snipes	Repeat with prefill to 2.2 x 10^-5 Torr. Got current rise up to nearly 300 kA but there was a problem with the EFC coil that may have caused the disruption at 0.13 sec.
Mar 2 1995 09:42:36:600AM	950302003	Joseph Snipes	Shot 3 Set prefill to 2.1 x 10^-5 Torr. Replaced some fuses in the EFC supply. Plasma nearly reached 1 MA, but disrupted at 0.52 sec.
Mar 2 1995 09:43:44:100AM	950302004	Joseph Snipes	Shot 4 Fizzle.
Mar 2 1995 10:07:52:210AM	950302005	Joseph Snipes	Shot 5 Fizzle!
Mar 2 1995 10:14:30:800AM	950302006	Joseph Snipes	Shot 6 Lowered Br offset in segment 1 from 6.5 mT to 6 mT. Raised prefill to 2.2 x 10^-5 Torr. Good shot. Disrupted in rampdown at 1.2 sec.
Mar 2 1995 10:57:50:490AM	950302007	Joseph Snipes	Shot 7 Density rise still too rapid early leading to a slow current rise on shot 6. Reduced early gas puff from 0.05 to 0.1 sec. Tried moving RXU and ZXU in and up, respectively at the end of the shot to keep the X point out of the vessel during the rampdown. However, it may have been the 0.5 MW of RF at the disruption on shot 6 that raised the radiated power too much as the density dropped. Fizzle.
Mar 2 1995 11:10:12:380AM	950302008	Joseph Snipes	Shot 8 Reduced early gas puff to try to increase the rate of current rise. Reduced density in the first half of the shot to 8.8 x 10^19 m^-2 to try to get the requested density. Kept the density up after 1.2 sec to try to avoid the disruption in the current rampdown. Good shot, disrupted at 1.2 sec again.
Mar 2 1995 11:11:22:120AM	950302009	Joseph Snipes	Shot 9 Fizzle!
Mar 2 1995 11:32:50:120AM	950302010	Joseph Snipes	Shot 10 Reduced OH2 U and L voltage around 0.005 sec by a few volts at Horne's suggestion to try to prevent fizzles. Good shot. RF at 0.8 MW from 0.7 to about 1.1 sec. Disrupted in rampdown.
Mar 2 1995 11:38:24:700AM	950302011	Joseph Snipes	Shot 11 Corrected ZXL programming that had been programmed to move up when I had intended to program ZXU to move up from shot 7 so that ZXU is now programmed to move up while ZXL is programmed to move down during the rampdown. Fizzle!
Mar 2 1995 11:45:37:270AM	950302012	Joseph Snipes	Shot 12 Repeat. Fizzle!
Mar 2 1995 11:57:21:280AM	950302013	Joseph Snipes	Shot 13 Raised prefill to 2.2 x 10^-5 Torr. Fizzle!
Mar 2 1995 12:11:17:170PM	950302014	Joseph Snipes	Shot 14 Raised Br offset to 6.7 mT to improve breakdown. Disrupted at 0.7 sec at 1 MA.
Mar 2 1995 12:44:04:510PM	950302015	Joseph Snipes	Shot 15 Reduced RCUR from 0.6675 to 0.665 m during the flattop to try to increase the outer gap a bit, hopefully to reduce the moly influx. Fizzle!
Mar 2 1995 12:45:57:820PM	950302016	Joseph Snipes	Shot 16 Fizzle!
Mar 2 1995 01:08:40:220PM	950302017	Joseph Snipes	Shot 17 Prefill set to 1.8 x 10^-5 Torr. Good shot. Disrupted in rampdown.
Mar 2 1995 01:09:33:750PM	950302018	Joseph Snipes	Shot 18 Fizzle!
Mar 2 1995 01:43:11:880PM	950302019	Joseph Snipes	Shot 19 Extended all shaping parameters out to about 1.3 sec. Very good shot ramped all the way down.
Mar 2 1995 01:55:21:240PM	950302020	Joseph Snipes	Shot 20 Good shot. Disrupted at 1.17 sec.
Mar 2 1995 02:08:14:010PM	950302021	Joseph Snipes	Shot 21 Fizzle!
Mar 2 1995 02:19:58:470PM	950302022	Joseph Snipes	Shot 22 Runaway discharge. Disrupted just before 0.5 sec.
Mar 2 1995 02:22:07:660PM	950302023	Joseph Snipes	Shot 23 Raised prefill to 2.1 x 10^-5 Torr. Fizzle
Mar 2 1995 02:42:38:240PM	950302024	Joseph Snipes	Shot 24 Lowered Br offset from 6.7 mT to 6.2 mT. Good shot! Ramped down to less than 0.3 MA before disrupting at 1.5 sec.
Mar 2 1995 02:54:04:230PM	950302025	Joseph Snipes	Shot 25 Repeat. Good shot. Disrupted at 1.0 sec. High moly emission during RF. RF power up to about 1.9 MW but decreasing during the shot.
Mar 2 1995 03:00:34:170PM	950302026	Joseph Snipes	Shot 26 Reduced prefill to 2.0 x 10^-5 Torr. Fizzle!
Mar 2 1995 03:28:42:990PM	950302027	Joseph Snipes	Shot 27 Raised prefill to 2.1 x 10^-5 Torr. Reduced OH2 by 5 V at breakdown. Good shot. RF up to 1.5 MW, ramped down to 1.49 sec before disrupting. TF crowbar, blown fuse. Short delay.
Mar 2 1995 03:50:40:820PM	950302028	Joseph Snipes	Shot 28 Repeat. Fizzle!
Mar 2 1995 04:21:10:920PM	950302029	Joseph Snipes	Shot 29 Good shot. Disrupted at 1.2 sec at 0.9 MA.
Mar 2 1995 04:22:16:460PM	950302030	Joseph Snipes	Shot 30 Fizzle!
Mar 2 1995 04:41:02:890PM	950302031	Joseph Snipes	Shot 31 Lowered Br offset from 6.2 mT to 6.0 mT. Runaway discharge disrupted at 0.43 sec.
Mar 2 1995 04:53:33:440PM	950302032	Joseph Snipes	Shot 32 Raised EF3 voltage "front porch" from 50 V to 100 V from -0.012 to -0.003 sec. New circuit boards installed in OH2 supply. Disrupted at 0.53 sec with some hard x rays.
Mar 2 1995 05:18:11:200PM	950302033	Joseph Snipes	Shot 33 Increased early gas puff to try to avoid the hard x rays. Seems to have worked, but the density went up too fast and led to a disruption at 0.65 sec.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:37:25:710AM	Plasma	Ok	no faults
2	08:58:10:160AM	Plasma	Ok	no faults
3	09:23:19:770AM	Plasma	Ok	no faults
4	09:40:50:560AM	Plasma	Ok	no faults
5	09:56:39:320AM	Plasma	Ok	no faults
6	10:10:31:170AM	Plasma	Ok	no faults
7	10:33:08:730AM	Plasma	Ok	no faults
8	10:43:15:090AM	Plasma	Ok	no faults
9	10:59:58:140AM	Plasma	Ok	no faults
10	11:11:41:330AM	Plasma	Ok	no faults
11	11:34:28:460AM	Plasma	Ok	no faults
12	11:43:27:130AM	Plasma	Ok	no faults
13	11:52:30:410AM	Plasma	Ok	no faults
14	12:02:21:640PM	Plasma	Ok	no faults
15	12:13:22:950PM	Plasma	Ok	no faults
16	12:26:32:860PM	Plasma	Ok	no faults
17	12:46:21:180PM	Plasma	Ok	No Faults.
18	01:07:46:850PM	Plasma	Ok	NO Faults.
19	01:25:36:850PM	Plasma	Ok	No Faults.
20	01:37:12:740PM	Plasma	Ok	OH1 Comm fault
21	01:55:29:370PM	Plasma	Ok	No Faults.
22	02:09:31:180PM	Plasma	Ok	OH2l comm fault
23	02:19:28:830PM	Plasma	Ok	No FAults.
24	02:31:44:070PM	Plasma	Ok	No Faults.
25	02:44:10:570PM	Plasma	Ok	No Faults.
26	02:57:34:890PM	Plasma	Ok	No Faults.
27	03:13:44:970PM	Plasma	Ok	REC. fuse blown Hi Tap T.F.
28	03:47:23:910PM	Plasma	Ok	No Faults.
29	04:02:59:000PM	Plasma	Ok	No Faults.
30	04:19:12:750PM	Plasma	Ok
31	04:32:02:410PM	Plasma	Ok	No faults./
32	04:43:38:390PM	Plasma	Ok	No Faults. New current Reg. bd.
33	04:55:46:640PM	Plasma	Ok	OH2L comm fail
34	07:39:52:160AM	Test	Ok	oh2 tests
35	07:57:15:300AM	Test	Ok	no faults
36	08:21:10:780AM	Test	Ok	no faults