Miniproposals

Miniproposal: 046 Date Filed: 4/7/1994 Title: Ohmic Confinement First Author: Martin Greenwald Session Leader: Martin Greenwald (shots 1-30)

Engineering Operator Run Comment

More reliable plasmas & Transport studies.

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Physics Operator Summaries

Session Leader Comments
Sep 22 1993 09:22:23:350AM		Martin Greenwald	RUN PLAN: Ohmic Confinement We want to push the database for ohmic confinement to higher current and density. We also want to take advantage of the OH double swing to get longer pulses/flat-tops. More specifically, we will try to put a small ramp on Ip until about .5 seconds - in hopes that will allow us to take up gas and ramp the density. We will start (approximately) with shot 930921019.
Sep 22 1993 09:34:49:130AM	930922001	Martin Greenwald	Dud. B-Radial feed back attempted - no offset correction yet.
Sep 22 1993 09:48:05:000AM	930922002	Martin Greenwald	Dud. B-Radial feed back - offset correction put in with wrong sign - oops.
Sep 22 1993 10:01:54:750AM	930922003	Martin Greenwald	Good shot Ip = .46 MA nel = .4e20 1 second long
Sep 22 1993 10:17:56:350AM	930922004	Martin Greenwald	Program Ip to rise to .6 MA at .5 sec, flat to .8 sec raise feedback gain from 4 to 6 Good breakdown, lots of runaways, hards early disrupts at .86 sec Ip = .55 MA nel = ?
Sep 22 1993 10:26:06:280AM	930922005	Martin Greenwald	Fizzle
Sep 22 1993 10:37:01:830AM	930922005	Martin Greenwald	Lower programmin on EF1 late to try to keep kappa down add some gas early
Sep 22 1993 10:47:56:570AM	930922006	Martin Greenwald	Lower programming on EF1 late to try to keep kappa down add some gas early Fizzle, late breakdown
Sep 22 1993 11:01:31:700AM	930922007	Martin Greenwald	Fizzle
Sep 22 1993 11:16:41:120AM	930922007	Martin Greenwald	Raise current in EF4 to get more vertical field lower pulse gas at beginning Fizzle
Sep 22 1993 11:41:43:260AM	930922008	Martin Greenwald	Fizzle
Sep 22 1993 11:39:57:070AM	930922009	Martin Greenwald	Fizzle
Sep 22 1993 11:53:50:280AM	930922010	Martin Greenwald	Fizzle
Sep 22 1993 12:11:23:790PM	930922011	Martin Greenwald	Fizzle
Sep 22 1993 12:20:55:780PM	930922012	Martin Greenwald	raise prefill to 1.5e-5 Fizzle
Sep 22 1993 12:26:56:560PM	930922012	Martin Greenwald	raise prefill to 1.5e-5 Fizzle but very close early breakdown and some burnout - deviates from good breakdown at .01 sec
Sep 22 1993 12:57:25:360PM	930922012	Martin Greenwald	raise prefill to 1.8e-5 Fizzle
Sep 22 1993 01:00:50:580PM	930922014	Martin Greenwald	Delay pulse gas by 4 msec Add .5 mT to B Radial Wall temp set point dropped 10 degrees to 25 Fizzle
Sep 22 1993 01:20:41:020PM	930922015	Martin Greenwald	Drop prefill to 1.5e-5 Add another .5 mT to B Radial Wall temp setpoint dropped to 20C Slowing BZ ramp with OH1 voltage Fizzle
Sep 22 1993 01:45:02:340PM	930922016	Martin Greenwald	Pulsed gas back 4 msec Drop 1 mT from B Radial (back to earlier value) Slowing BZ ramp with OH1 voltage Fizzle
Sep 22 1993 01:50:47:220PM	930922017	Martin Greenwald	Prefill to 1.2e-5 Fizzle of course
Sep 22 1993 02:06:48:220PM	930922018	Martin Greenwald	Prefill to 1.e-5 Fizzle of course
Sep 22 1993 02:49:56:030PM	930922020	Martin Greenwald	Back to shot 003 Fizzles
Sep 22 1993 02:59:31:180PM	930922021	Martin Greenwald	Go down 1 mT in radial field Good Shot Ip = .46 MA Lasts 1 sec nel = .4e20
Sep 22 1993 03:21:22:150PM	930922022	Martin Greenwald	Repeat Good Shot
Sep 22 1993 03:22:57:250PM	930922023	Martin Greenwald	Change Zxl position - down 5 cm Good plasma (but not much change in elongation)
Sep 22 1993 03:42:28:150PM	930922024	Martin Greenwald	Moved plasma up 2 cm in 1 cm good plasma but still diverted and elongation >1.6
Sep 22 1993 03:56:21:720PM	930922024	Martin Greenwald	Reprogram EF1's - made identical current in EF1 will be lower by about 500 A at .5 sec and by 1000 A at .9 sec and turn off ZXL feedback Good Shot - slightly less elongation but still diverted late
Sep 22 1993 04:05:21:260PM	930922026	Martin Greenwald	Try to reduce elongation by dropping OH2 voltage (10 volts) Plasma current programmed to ramp to .6 MA at .6 sec gain of 6 Dud
Sep 22 1993 04:16:04:920PM	930922027	Martin Greenwald	Repeat Dud
Sep 22 1993 04:29:28:750PM	930922028	Martin Greenwald	Raise fill to 1.4 and raise pulse gas Fizzle
Sep 22 1993 04:49:30:200PM	930922028	Martin Greenwald	Dud not fizzle
Sep 22 1993 04:57:12:200PM	930922028	Martin Greenwald	Dud not fizzle
Sep 22 1993 04:58:04:900PM	930922029	Martin Greenwald	Shot lasts about .3 secs - very disruptive

Physics Operator Comments

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:25:01:710AM	Plasma	Ok	Plasma shot no faults.
2	09:37:44:430AM	Plasma	Ok	no faults
3	09:50:42:230AM	Plasma	Ok	Plasma shot No faults.
4	10:08:27:040AM	Plasma	Ok	Plasma shot No faults.
5	10:22:52:160AM	Plasma	Bad	Com fail OH1 in inversion
6	10:41:37:240AM	Plasma	Ok	plasma shot No faults.
7	10:57:41:470AM	Plasma	Ok	Plasma shot fizzle no faults.
8	11:14:15:960AM	Plasma	Ok	Plasma shot > one scr not conducting.
9	11:29:46:540AM	Plasma	Ok	no faults
10	11:50:10:700AM	Plasma	Ok	no faults
11	12:05:27:050PM	Plasma	Ok	no faults
12	12:18:49:020PM	Plasma	Ok	no faults
13	12:32:02:360PM	Plasma	Ok	no faults
14	12:58:26:130PM	Plasma	Ok	no faults
15	01:13:38:260PM	Plasma	Ok	no faults
16	01:35:00:680PM	Plasma	Ok	Plasma shot no faults.
17	01:48:35:010PM	Plasma	Ok	Plasma shot no faults.
18	02:04:18:200PM	Plasma	Ok	Plasma shot no faults
19	02:17:44:800PM	Plasma	Ok	Plasma shot no faults.
20	02:30:47:700PM	Plasma	Ok	Plasma shot no faults.
21	02:44:40:580PM	Plasma	Ok	Plasma shot no faults.
22	02:59:42:180PM	Plasma	Ok	plasma shot no faults.
23	03:13:54:090PM	Plasma	Ok	Plasma shot No faults
24	03:29:15:390PM	Plasma	Ok	Plasma shot no faults.
25	03:43:45:860PM	Plasma	Ok	plasma shot no faults.
26	04:00:33:410PM	Plasma	Ok	Plasma shot no faults
27	04:13:11:350PM	Plasma	Ok	Plasma shot No faults.
28	04:26:38:430PM	Plasma	Ok	Plasma shot No faults.
29	04:39:57:270PM	Plasma	Ok	PLasma shot no faults.
30	04:54:29:520PM	Plasma	Ok	Plasma shot no faults.