Alcator C-Mod Run 930806 Information

Miniproposals

Miniproposal: 014

Date Filed: 7/14/1993

Title: ICRF Antenna Loading Studies

First Author: Yuichi Takase

Session Leader: Steve Golovato (shots 1-34)

Operators
Session leader(s):	Steve Golovato
Physics operator(s):	Yuichi Takase
Engineering operator(s):	Joe Daigle

Engineering Operator Run Comment
continuation of run 930806

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Physics Operator Summaries

Entered: Jul 7 2004 04:36:50:287PM

Author: To Be Determined

Physics Operator's Summary for 930806 Run

Same wall preparation as yesterday, but the wall condition
was definitely not the same, according to Horne's scatter plot.
Worked on plasma rampdown to get rid of uncontrolled plasma
loss at the end of the shot. Plasma was programmed to terminate
on the inner wall by pushing it in with EF3. The RF limiter
was moved in to R=0.88m for two shots (27 and 28) which were
both very disruptive. Will need to work on discharge development
for McCracken's run (MP018). The pellet valve was allowed to
open on the last shot, with the predictable result (fizzle).

Shot fill change result

1 1.2e-5 fizzle
2 1.1 good
3 1.1 good
4 1.0 remove last gas puff from valve 3 dud
5 1.2 dud
6 1.3 rf start moved back good
7 1.3 fizzle
8 1.2 good
9 1.2 good
10 1.3 good
11 1.3 take OH1 and OH2 out of R_CUR good
12 1.4 try to ramp Ip down with OH1 good
(no disruption at the end)
13 1.4 extended power supplies good
14 1.4 OH1 ramp moved earlier good
15 1.3 good
16 1.3 a little more early gas puff good
(good rf shot)
17 1.3 fizzle
18 1.2 good
19 1.2 good
20 1.2 push plasma in with EF3 at end good
21 1.1 EF3 push cut in half good
22 1.1 EF3 push and early gas reduced good
(good rf shot)
23 1.1 changed ef3 waveform good
24 1.1 more ef3 push at end good
25 1.1 good
26 1.1 more initial gas puff good
27 1.1 limiter moved to 88 disruptive
28 1.0 disruptive
29 1.0 limiter back to 90, moved R_CUR out fizzle
30 1.1 loaded 025, cut back on initial puff good
31 1.1 initial R_CUR to 65 good
32 1.1 R_CUR 66, more puff at 0.1s good
33 1.1 EF4 increased by 10A good
(faster Ip rise)
34 0.9 pellet attempt fizzle

Session Leader Comments

Aug 6 1993 09:18:48:920AM Yuichi Takase Day 2 of MP014 (ICRF Coupling)
Session Leader: Golovato
Physics Operator: Takase
Engineering Operator: Daigle

Same wall preparation, 35C bake and 2hr ECDC (start with warm wall).
Shot 001 loaded from last shot from yesterday 930805027 (no change).
Fill pressure 1.2e-5

Aug 6 1993 09:18:52:880AM Yuichi Takase Day 2 of MP014 (ICRF Coupling)
Session Leader: Golovato
Physics Operator: Takase
Engineering Operator: Daigle

Same wall preparation, 35C bake and 2hr ECDC (start with warm wall).
Shot 001 loaded from last shot from yesterday 930805027 (no change).
Fill pressure 1.2e-5

Aug 6 1993 09:20:04:020AM Steve Golovato the goals are to:

(1) establish antenna operation with plasma
(2) tune to match with plasma
(3) measure loading for various conditons outlined in mini-proposal.
(4) raise power

Aug 6 1993 09:20:18:480AM Steve Golovato the goals are to:

(1) establish antenna operation with plasma
(2) tune to match with plasma
(3) measure loading for various conditons outlined in mini-proposal.
(4) raise power

Aug 6 1993 09:20:39:630AM Steve Golovato the goals are to:

(1) establish antenna operation with plasma
(2) tune to match with plasma
(3) measure loading for various conditons outlined in mini-proposal.
(4) raise power

Aug 6 1993 09:20:44:750AM Steve Golovato the goals are to:

(1) establish antenna operation with plasma
(2) tune to match with plasma
(3) measure loading for various conditons outlined in mini-proposal.
(4) raise power

Aug 6 1993 09:20:55:460AM Steve Golovato the goals are to:

(1) establish antenna operation with plasma
(2) tune to match with plasma
(3) measure loading for various conditons outlined in mini-proposal.
(4) raise power

Aug 6 1993 09:22:02:790AM 930806001 Steve Golovato shot 930806001

fizzled. maybe pressure too high.

Aug 6 1993 09:50:56:580AM 930806002 Steve Golovato shot 930806002

rf and shot ran.make entry

Aug 6 1993 09:54:25:680AM 930806003 Steve Golovato shot 930806003

good shot, rf arced except at end where power is lower.
rf is being run from -20 to 400 ms. the power is very low and should
not be seen by anyone or affect anything. it is being stepped in power
during the pulse. it arcs except at the beginning and end of the
pulse where the the power is lowest.

Aug 6 1993 09:55:10:540AM 930806004 Steve Golovato shot 930806004

dud, no breakdown. maybe pressure too low.

Aug 6 1993 10:05:57:830AM 930806005 Steve Golovato shot 930806005

another dud. rf moved to start after breakdown.
it would be a good result for rf if it could affect breakdown at these power
levels.

Aug 6 1993 10:35:08:940AM 930806006 Steve Golovato shot 930806006

gas raised to 1.3e-5, shot ran. probably not related to rf timing.

Aug 6 1993 10:35:22:080AM 930806006 Steve Golovato shot 930806006

gas raised to 1.3e-5, shot ran. probably not related to rf timing.

Aug 6 1993 10:44:14:460AM 930806007 Steve Golovato shot 930806007
fizzle.
very late breakdown (15ms), perhaps magnetics problems.

Aug 6 1993 10:44:20:960AM 930806007 Steve Golovato shot 930806007
fizzle.
very late breakdown (15ms), perhaps magnetics problems.

Aug 6 1993 12:44:02:280PM 930806008 Steve Golovato shot 930806008

lower fill to 1.2e-5 and try again.

Aug 6 1993 12:56:28:260PM 930806016 Steve Golovato shot 930806016

finally got the antenna matching program running, trying its prediction
for plasma tuning. first shot where rf didn't arc. raise the power
for next shot.

Aug 6 1993 12:56:39:540PM 930806016 Steve Golovato shot 930806016

finally got the antenna matching program running, trying its prediction
for plasma tuning. first shot where rf didn't arc. raise the power
for next shot.

Aug 6 1993 12:56:48:230PM 930806016 Steve Golovato shot 930806016

finally got the antenna matching program running, trying its prediction
for plasma tuning. first shot where rf didn't arc. raise the power
for next shot.

Aug 6 1993 02:15:38:630PM 930806017 Steve Golovato shot 930806022

back to vacuum tuning.

Aug 6 1993 02:32:23:630PM 930806017 Steve Golovato shot 930806022

back to vacuum tuning.

Aug 6 1993 02:48:35:970PM 930806023 Steve Golovato shot 930806023

back to "plasma?" tuning. raise power a little.

Aug 6 1993 05:00:14:230PM 930806023 Steve Golovato shot 930806023

back to "plasma?" tuning. raise power a little.

Physics Operator Comments

Engineering Operator Comments

Shot Time Type Status Comment

1 09:05:15:270AM Plasma Ok Plasma shot power systems O.K.

2 09:17:39:810AM Plasma Ok plasma shot no faults

3 09:31:09:350AM Plasma Ok Plasma shot No faults.

4 09:44:51:240AM Plasma Ok Plasma fizzle Power systems O.K.

5 09:57:24:870AM Plasma Ok Plasma fizzle Power systems O.K.

6 10:16:23:560AM Plasma Ok Plasma shoty no faults.

7 10:30:45:370AM Plasma Ok Plasma fizzle power systems O.K.

8 10:45:31:990AM Plasma Ok Plasma shot No faults.

9 11:00:32:450AM Plasma Ok Plasma shot no faults.

10 11:15:25:660AM Plasma Ok Plasma shot Power supplies O.K.

11 11:31:52:570AM Plasma Ok Plasma shot no faults.

12 11:46:20:890AM Plasma Ok plasma

13 12:01:32:970PM Plasma Ok no faults

14 12:16:45:460PM Test Ok igors baby food

15 12:31:56:120PM Test Ok plasma

16 12:45:43:460PM Test Ok plasma shot O.K.

17 12:58:14:730PM Test Ok Plasma shot Power systems no faults.

18 01:09:44:300PM Plasma Ok Plasma shot Power systems O.K.

19 01:25:17:430PM Plasma Ok Plasma shot No faults.

20 01:38:43:590PM Plasma Ok Plasma shot No faults.

21 01:54:28:570PM Plasma Ok Plasma shot no faults.

22 02:07:36:700PM Plasma Ok plasma shot no faults.

23 02:21:45:470PM Plasma Ok Plasma shot No faults.

24 02:36:35:770PM Plasma Ok Gopod 300 kA shot

25 02:50:23:930PM Plasma Ok Good 300 kA plasma

26 03:05:52:000PM Plasma Ok Good 300 kA Plasma

27 03:19:19:090PM Plasma Ok Good 300 kA plasma

28 03:34:37:890PM Plasma Ok Disruptive plasma; only 210 kA

29 03:51:59:440PM Plasma Ok Fizzle

30 04:03:46:980PM Plasma Ok Good 360 kA shot

31 04:17:47:460PM Plasma Ok Good repeat of last shot

32 04:32:22:630PM Plasma Ok Better radial position control early

33 04:46:03:970PM Plasma Ok Good Shot

34 05:00:41:610PM Plasma Ok Fizzle (opened pellet injector gate valve)

Session Leader Comments
Aug 6 1993 09:18:48:920AM		Yuichi Takase	Day 2 of MP014 (ICRF Coupling) Session Leader: Golovato Physics Operator: Takase Engineering Operator: Daigle Same wall preparation, 35C bake and 2hr ECDC (start with warm wall). Shot 001 loaded from last shot from yesterday 930805027 (no change). Fill pressure 1.2e-5
Aug 6 1993 09:18:52:880AM		Yuichi Takase	Day 2 of MP014 (ICRF Coupling) Session Leader: Golovato Physics Operator: Takase Engineering Operator: Daigle Same wall preparation, 35C bake and 2hr ECDC (start with warm wall). Shot 001 loaded from last shot from yesterday 930805027 (no change). Fill pressure 1.2e-5
Aug 6 1993 09:20:04:020AM		Steve Golovato	the goals are to: (1) establish antenna operation with plasma (2) tune to match with plasma (3) measure loading for various conditons outlined in mini-proposal. (4) raise power
Aug 6 1993 09:20:18:480AM		Steve Golovato	the goals are to: (1) establish antenna operation with plasma (2) tune to match with plasma (3) measure loading for various conditons outlined in mini-proposal. (4) raise power
Aug 6 1993 09:20:39:630AM		Steve Golovato	the goals are to: (1) establish antenna operation with plasma (2) tune to match with plasma (3) measure loading for various conditons outlined in mini-proposal. (4) raise power
Aug 6 1993 09:20:44:750AM		Steve Golovato	the goals are to: (1) establish antenna operation with plasma (2) tune to match with plasma (3) measure loading for various conditons outlined in mini-proposal. (4) raise power
Aug 6 1993 09:20:55:460AM		Steve Golovato	the goals are to: (1) establish antenna operation with plasma (2) tune to match with plasma (3) measure loading for various conditons outlined in mini-proposal. (4) raise power
Aug 6 1993 09:22:02:790AM	930806001	Steve Golovato	shot 930806001 fizzled. maybe pressure too high.
Aug 6 1993 09:50:56:580AM	930806002	Steve Golovato	shot 930806002 rf and shot ran.make entry
Aug 6 1993 09:54:25:680AM	930806003	Steve Golovato	shot 930806003 good shot, rf arced except at end where power is lower. rf is being run from -20 to 400 ms. the power is very low and should not be seen by anyone or affect anything. it is being stepped in power during the pulse. it arcs except at the beginning and end of the pulse where the the power is lowest.
Aug 6 1993 09:55:10:540AM	930806004	Steve Golovato	shot 930806004 dud, no breakdown. maybe pressure too low.
Aug 6 1993 10:05:57:830AM	930806005	Steve Golovato	shot 930806005 another dud. rf moved to start after breakdown. it would be a good result for rf if it could affect breakdown at these power levels.
Aug 6 1993 10:35:08:940AM	930806006	Steve Golovato	shot 930806006 gas raised to 1.3e-5, shot ran. probably not related to rf timing.
Aug 6 1993 10:35:22:080AM	930806006	Steve Golovato	shot 930806006 gas raised to 1.3e-5, shot ran. probably not related to rf timing.
Aug 6 1993 10:44:14:460AM	930806007	Steve Golovato	shot 930806007 fizzle. very late breakdown (15ms), perhaps magnetics problems.
Aug 6 1993 10:44:20:960AM	930806007	Steve Golovato	shot 930806007 fizzle. very late breakdown (15ms), perhaps magnetics problems.
Aug 6 1993 12:44:02:280PM	930806008	Steve Golovato	shot 930806008 lower fill to 1.2e-5 and try again.
Aug 6 1993 12:56:28:260PM	930806016	Steve Golovato	shot 930806016 finally got the antenna matching program running, trying its prediction for plasma tuning. first shot where rf didn't arc. raise the power for next shot.
Aug 6 1993 12:56:39:540PM	930806016	Steve Golovato	shot 930806016 finally got the antenna matching program running, trying its prediction for plasma tuning. first shot where rf didn't arc. raise the power for next shot.
Aug 6 1993 12:56:48:230PM	930806016	Steve Golovato	shot 930806016 finally got the antenna matching program running, trying its prediction for plasma tuning. first shot where rf didn't arc. raise the power for next shot.
Aug 6 1993 02:15:38:630PM	930806017	Steve Golovato	shot 930806022 back to vacuum tuning.
Aug 6 1993 02:32:23:630PM	930806017	Steve Golovato	shot 930806022 back to vacuum tuning.
Aug 6 1993 02:48:35:970PM	930806023	Steve Golovato	shot 930806023 back to "plasma?" tuning. raise power a little.
Aug 6 1993 05:00:14:230PM	930806023	Steve Golovato	shot 930806023 back to "plasma?" tuning. raise power a little.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:05:15:270AM	Plasma	Ok	Plasma shot power systems O.K.
2	09:17:39:810AM	Plasma	Ok	plasma shot no faults
3	09:31:09:350AM	Plasma	Ok	Plasma shot No faults.
4	09:44:51:240AM	Plasma	Ok	Plasma fizzle Power systems O.K.
5	09:57:24:870AM	Plasma	Ok	Plasma fizzle Power systems O.K.
6	10:16:23:560AM	Plasma	Ok	Plasma shoty no faults.
7	10:30:45:370AM	Plasma	Ok	Plasma fizzle power systems O.K.
8	10:45:31:990AM	Plasma	Ok	Plasma shot No faults.
9	11:00:32:450AM	Plasma	Ok	Plasma shot no faults.
10	11:15:25:660AM	Plasma	Ok	Plasma shot Power supplies O.K.
11	11:31:52:570AM	Plasma	Ok	Plasma shot no faults.
12	11:46:20:890AM	Plasma	Ok	plasma
13	12:01:32:970PM	Plasma	Ok	no faults
14	12:16:45:460PM	Test	Ok	igors baby food
15	12:31:56:120PM	Test	Ok	plasma
16	12:45:43:460PM	Test	Ok	plasma shot O.K.
17	12:58:14:730PM	Test	Ok	Plasma shot Power systems no faults.
18	01:09:44:300PM	Plasma	Ok	Plasma shot Power systems O.K.
19	01:25:17:430PM	Plasma	Ok	Plasma shot No faults.
20	01:38:43:590PM	Plasma	Ok	Plasma shot No faults.
21	01:54:28:570PM	Plasma	Ok	Plasma shot no faults.
22	02:07:36:700PM	Plasma	Ok	plasma shot no faults.
23	02:21:45:470PM	Plasma	Ok	Plasma shot No faults.
24	02:36:35:770PM	Plasma	Ok	Gopod 300 kA shot
25	02:50:23:930PM	Plasma	Ok	Good 300 kA plasma
26	03:05:52:000PM	Plasma	Ok	Good 300 kA Plasma
27	03:19:19:090PM	Plasma	Ok	Good 300 kA plasma
28	03:34:37:890PM	Plasma	Ok	Disruptive plasma; only 210 kA
29	03:51:59:440PM	Plasma	Ok	Fizzle
30	04:03:46:980PM	Plasma	Ok	Good 360 kA shot
31	04:17:47:460PM	Plasma	Ok	Good repeat of last shot
32	04:32:22:630PM	Plasma	Ok	Better radial position control early
33	04:46:03:970PM	Plasma	Ok	Good Shot
34	05:00:41:610PM	Plasma	Ok	Fizzle (opened pellet injector gate valve)