Alcator C-Mod Run 940525 Information

Miniproposals

Miniproposal: 052

Date Filed: 4/12/1994

Title: ICRF Antenna Tuning (P

First Author: Yuichi Takase

Session Leader: Yuichi Takase (shots 1-34)

Miniproposal: 054

Date Filed: 4/5/1994

Title: ICRF Antenna Conditioning (PRF> 100kW)

First Author: Yuichi Takase

Session Leader: Yuichi Takase (shots 1-34)

Operators
Session leader(s):	Yuichi Takase,Yuichi Takase
Physics operator(s):	Earl Marmar
Engineering operator(s):	Vinny Bertolino,Joe Daigle

Engineering Operator Run Comment
icrf tuning, HIREX troubleshoot

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:10:383PM

Author: To Be Determined

Run Summary for 940525

SL: Takase
PO: Marmar
EO: Daigle/Bertolino

MP052 RF Tuning
MP054 RF Conditioning

Today's run was highly successful in spite of the fact that
we had only 6 usable shots (or more precisely, half shots).
We started from 940524025 (last shot from yesterday) minus
Tinios's ZCUR glitch. There were a lot of duds and fizzles.
During the course of today's run, the equilibrium evolved
to an inner-wall limited plasma with lower elongation. The
plasma still diverts after about 0.4sec, elongates, and
terminates in a vertical disruption (see, for example,
940525031). On the last shot (940525034) we have attempted
to move the plasma up so it is centered on the midplane,
but the plasma died early.

On the first successful shot 940525007 we have obtained
perfect tuning, at a power level of 100kW, and have declared
MP052 completed. On subsequent shots we have tried to increase
the injected power. The highest power achieved was about
0.6MW on 940525028. Shots 030 and 031 were programmed for
higher power, but because of degraded tuning the net injected
power was lower. The following is a list of good shots
from today:
P_rf (MW)
940525007 0.1
940525020 0.2
940525023 0.3
940525028 0.6
940525030 0.3
940525031 0.4

We will continue MP054 tomorrow. Our goal is 1MW into the
plasma.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:51:443PM

Author: To Be Determined

From: PHYSOP::MARMAR
Date: 25-MAY-1994 23:19:19
Description: Physop run summary: 940525

The goals of this run were to get reproducible plasmas for RF tuning, and if
that was accomplished, begin RF conditioning to high power. The plasmas were
no more reproducible than in past runs, but as Yuichi said in the session
leader summary, it only took one decent shot to declare the tuning MP
complete. We played with many knobs in the attempt to get good shots, and
while some progress was made, we are by no means done with discharge
development. The good news was that we did not appear to lose any more
magnetics signals. As Steve Wolfe suggested, in future we should start our
runs at shot 20 rather than shot 1.

Shot rehash:

1) Started from last shot of 940524 with zcur glitch removed and Ip demand
lowered to .7 MA. Fill 1.2e-5, D2 fill and puff. Fizzle.

2) Fill 1.0e-5; fizzle

3) Br offset to -3e-3 from -2e-3.

4) EF4 to -1065 from -1050; short disruptive shot

5) Lower initial puff; dud

6) Fill 1.2e-5; fizzle

7) Br offset to -2.5e-3; fill to 1.1e-5; plasma

8) Change EF2U to go more -ve after 100 msec; dud

9) Ramp Ip prop gain more slowly, move Rcur out .5 cm; fizzle

10) Br offset to -2e-3; fizzle

11) EF I's from 4500 to 4800; fizzle

12) EF4's less -ve by 30 A; fizzle

13) EF4's more -ve by 10A, fill 1.0e-5; dud

14) Fill 1.1e-5; runaway shot

15) Fill 1.2e-5, increase early puff; fizzle

16) No changes; fizzle

17) Lower OH1 volt demand after t=0; dud

18) EF4's less -ve by 15 A; plasma

19) Pulsed gas tweaks; ugly plasma, short, 200 kA

20) Tweak gains on slow Zcur, lower pulsed gas; .5 seconds, 700 kA

21) chaanged clearin to -.01 meter; dud

22) no changes; fizzle

23) reload shot 20; plasma

24) Ip demand to 600 kA, clearin to -.01; fizzle

25) Increase Argon program; 0 RXL, ZXL and Clearin gain; EF1's on I control;
copy EF2L into EF2U prog; dud

26) EF4U less -ve by 10 A; dud

27) BR_0 offset to -1e-3; fizzle

28) BR_0 offset to -2.5e-3; EF4 to -1035A; plasma

29) EF1's I prop gain off at .45s; EF2's tweaked; pulsed gas lowered; short
plasma, 140 ms, 280 kA

30) No changes; 660 kA, 560 ms.

31) Raise deriv gain on fast Zcur; ramp EF2's to 0 a little faster; put back
EF1 gains to 1 at .45 s; 700 ms plasma.

32) raise Ar puff, EF1L gain and ramp raised; EF1U gain raised; EF2's tweaked;
shorter shot, saw some argon.

33) No changes; dud

34) Zcur to +1cm; short disruptive shot.

Recommendations for tomorrow: start from 940525031 and use Argon puff program
like 940525032; if this goes, try raising Zcur.

Session Leader Comments

May 25 1994 09:12:32:470AM 940525001 Yuichi Takase MP052 RF Tuning / MP054 RF Conditioning
Start from 940524025 minus Tinios's ZCUR glitch
Vac. conditioned to 200kW, V_outer=60kV, V_inner=40kV
before the run.
ST 208, PS 704 (tune from 940524017).
Fizzle

May 25 1994 09:49:43:060AM 940525002 Yuichi Takase Fizzle.
Fix the arc detector before the next shot.

May 25 1994 09:50:18:280AM 940525003 Yuichi Takase Fizzle.
Making RF plasmas (visible on Z meter).

May 25 1994 10:18:25:170AM 940525004 Yuichi Takase Early disruption @ .13sec (RF not on yet).
RF plasma 0.42-0.55sec.
Fizzle detector interlock for RF installed for next shot.
Move RF start earlier for next shot.

May 25 1994 10:28:07:810AM 940525005 Yuichi Takase Dud.
Fizzle detector interlock works.

May 25 1994 10:36:10:960AM 940525006 Yuichi Takase Fizzle.
Raise the initial RF power level for the next shot.
BiRa -6.5V

May 25 1994 11:05:50:350AM 940525007 Yuichi Takase Plasma, disrupt @ .48sec.
Great tune, rho=0.002!
ST=207, PS=705.
Prf ramping up to 100kW.
"Loading" is about 10 Ohms
(definition of loading must be checked).

Moving on to MP054 (RF Conditioning).

May 25 1994 11:07:05:250AM 940525007 Yuichi Takase Plasma, disrupt @ .48sec.
Great tune, rho=0.002!
ST=207, PS=705.
Prf ramping up to 100kW.
"Loading" is about 10 Ohms
(definition of loading must be checked).

Moving on to MP054 (RF Conditioning).

May 25 1994 11:07:28:880AM 940525008 Yuichi Takase Dud.

May 25 1994 11:23:28:480AM 940525008 Yuichi Takase Dud.

May 25 1994 11:23:38:740AM 940525009 Yuichi Takase Fizzle.

May 25 1994 11:38:38:360AM 940525010 Yuichi Takase Fizzle.

May 25 1994 11:48:53:110AM 940525011 Yuichi Takase Fizzle.

May 25 1994 11:55:54:880AM 940525012 Yuichi Takase Fizzle.

May 25 1994 12:07:31:850PM 940525013 Yuichi Takase Dud.

May 25 1994 12:33:53:640PM 940525014 Yuichi Takase Runaway shot.
Killed a probe on the limiter (B_mid_L_B).
Ugly shot, disrupted @ 0.36sec.

May 25 1994 12:45:52:310PM 940525015 Yuichi Takase Fizzle

May 25 1994 12:53:45:370PM 940525016 Yuichi Takase Fizzle

May 25 1994 01:11:57:240PM 940525017 Yuichi Takase Dud

May 25 1994 01:22:35:010PM 940525018 Yuichi Takase Finally got plasma back, but ugly.
Disrupts @ 0.36sec.

May 25 1994 01:45:24:670PM 940525019 Yuichi Takase 2 in a row!
But disrupted early (0.145sec).

May 25 1994 01:51:43:430PM 940525020 Yuichi Takase Good shot, P_rf=200kW.
Disrupted at 0.495sec.

May 25 1994 02:01:36:080PM 940525021 Yuichi Takase Dud.

May 25 1994 02:09:27:720PM 940525022 Yuichi Takase Fizzle

May 25 1994 02:33:28:330PM 940525023 Yuichi Takase Good shot, disrupted @ 0.42sec.
300kW, then becomes disruptive.

May 25 1994 03:05:29:110PM 940525024 Yuichi Takase Fizzle

May 25 1994 03:05:38:550PM 940525025 Yuichi Takase Dud

May 25 1994 03:05:43:860PM 940525026 Yuichi Takase Dud

May 25 1994 03:20:46:000PM 940525027 Yuichi Takase Fizzle

May 25 1994 03:40:29:650PM 940525028 Yuichi Takase Good shot, disrupt @ 0.6sec.
P_rf=600kW.

May 25 1994 03:58:32:910PM 940525029 Yuichi Takase Early disruption @ 0.15sec.

May 25 1994 04:16:18:890PM 940525030 Yuichi Takase Disrupted at 0.57sec.
Lower power (300kW).
Lower loading?

May 25 1994 04:22:36:070PM 940525031 Yuichi Takase Lasted till 0.7sec.
RF power being modulated.
P_rf=400kW.

May 25 1994 04:36:05:630PM 940525032 Yuichi Takase Died early @ 0.20sec.

May 25 1994 04:48:47:870PM 940525033 Yuichi Takase Dud.

May 25 1994 05:10:03:840PM 940525034 Yuichi Takase Died @ 0.18sec.

Physics Operator Comments

Engineering Operator Comments

Shot Time Type Status Comment

1 09:05:34:810AM Plasma Ok no faults

2 09:18:00:100AM Plasma Ok no faults

3 09:39:20:510AM Plasma Ok no faults

4 10:03:14:840AM Plasma Ok no faults

5 10:20:05:760AM Plasma Ok no faults

6 10:28:34:610AM Plasma Ok no faults

7 10:40:00:800AM Plasma Ok no faults

8 10:54:03:690AM Plasma Ok no faults

9 11:05:47:930AM Plasma Ok no faults

10 11:22:27:840AM Plasma Ok no faults

11 11:37:30:100AM Plasma Ok no faults

12 11:50:38:460AM Plasma Ok no faults

13 12:02:00:440PM Plasma Ok no faults

14 12:13:20:770PM Plasma Ok no faults

15 12:31:24:170PM Plasma Ok no faults

16 12:45:19:300PM Plasma Ok no faults

17 12:57:14:380PM Plasma Ok no faults

18 01:10:48:970PM Plasma Ok comm fault OH2L Plasma 690 KA

19 01:25:49:430PM Plasma Ok No faults

20 01:36:56:560PM Plasma Ok Good shot No faults

21 01:52:56:610PM Plasma Ok No Faults

22 02:02:43:620PM Plasma Ok fizzle

23 02:17:16:170PM Test Ok NO faults

24 02:31:56:200PM Test Ok NO faults fizzle

25 02:46:39:610PM Plasma Ok Fizzle No Faults

26 02:57:27:620PM Plasma Bad dud No Faults.

27 03:10:09:270PM Plasma Ok NO faults

28 03:22:20:260PM Plasma Ok 650KA Plasma no faults

29 03:42:29:330PM Plasma Ok No faults Dud

30 03:54:27:840PM Plasma Ok No faults 680KA Plasma

31 04:12:18:140PM Test Ok Plasma shot O.K. No faults

32 04:31:02:120PM Plasma Ok plasma shot no faults

33 04:42:54:250PM Plasma Ok dud no faults

34 04:56:12:190PM Plasma Ok Plasma shot no faults

Session Leader Comments
May 25 1994 09:12:32:470AM	940525001	Yuichi Takase	MP052 RF Tuning / MP054 RF Conditioning Start from 940524025 minus Tinios's ZCUR glitch Vac. conditioned to 200kW, V_outer=60kV, V_inner=40kV before the run. ST 208, PS 704 (tune from 940524017). Fizzle
May 25 1994 09:49:43:060AM	940525002	Yuichi Takase	Fizzle. Fix the arc detector before the next shot.
May 25 1994 09:50:18:280AM	940525003	Yuichi Takase	Fizzle. Making RF plasmas (visible on Z meter).
May 25 1994 10:18:25:170AM	940525004	Yuichi Takase	Early disruption @ .13sec (RF not on yet). RF plasma 0.42-0.55sec. Fizzle detector interlock for RF installed for next shot. Move RF start earlier for next shot.
May 25 1994 10:28:07:810AM	940525005	Yuichi Takase	Dud. Fizzle detector interlock works.
May 25 1994 10:36:10:960AM	940525006	Yuichi Takase	Fizzle. Raise the initial RF power level for the next shot. BiRa -6.5V
May 25 1994 11:05:50:350AM	940525007	Yuichi Takase	Plasma, disrupt @ .48sec. Great tune, rho=0.002! ST=207, PS=705. Prf ramping up to 100kW. "Loading" is about 10 Ohms (definition of loading must be checked). Moving on to MP054 (RF Conditioning).
May 25 1994 11:07:05:250AM	940525007	Yuichi Takase	Plasma, disrupt @ .48sec. Great tune, rho=0.002! ST=207, PS=705. Prf ramping up to 100kW. "Loading" is about 10 Ohms (definition of loading must be checked). Moving on to MP054 (RF Conditioning).
May 25 1994 11:07:28:880AM	940525008	Yuichi Takase	Dud.
May 25 1994 11:23:28:480AM	940525008	Yuichi Takase	Dud.
May 25 1994 11:23:38:740AM	940525009	Yuichi Takase	Fizzle.
May 25 1994 11:38:38:360AM	940525010	Yuichi Takase	Fizzle.
May 25 1994 11:48:53:110AM	940525011	Yuichi Takase	Fizzle.
May 25 1994 11:55:54:880AM	940525012	Yuichi Takase	Fizzle.
May 25 1994 12:07:31:850PM	940525013	Yuichi Takase	Dud.
May 25 1994 12:33:53:640PM	940525014	Yuichi Takase	Runaway shot. Killed a probe on the limiter (B_mid_L_B). Ugly shot, disrupted @ 0.36sec.
May 25 1994 12:45:52:310PM	940525015	Yuichi Takase	Fizzle
May 25 1994 12:53:45:370PM	940525016	Yuichi Takase	Fizzle
May 25 1994 01:11:57:240PM	940525017	Yuichi Takase	Dud
May 25 1994 01:22:35:010PM	940525018	Yuichi Takase	Finally got plasma back, but ugly. Disrupts @ 0.36sec.
May 25 1994 01:45:24:670PM	940525019	Yuichi Takase	2 in a row! But disrupted early (0.145sec).
May 25 1994 01:51:43:430PM	940525020	Yuichi Takase	Good shot, P_rf=200kW. Disrupted at 0.495sec.
May 25 1994 02:01:36:080PM	940525021	Yuichi Takase	Dud.
May 25 1994 02:09:27:720PM	940525022	Yuichi Takase	Fizzle
May 25 1994 02:33:28:330PM	940525023	Yuichi Takase	Good shot, disrupted @ 0.42sec. 300kW, then becomes disruptive.
May 25 1994 03:05:29:110PM	940525024	Yuichi Takase	Fizzle
May 25 1994 03:05:38:550PM	940525025	Yuichi Takase	Dud
May 25 1994 03:05:43:860PM	940525026	Yuichi Takase	Dud
May 25 1994 03:20:46:000PM	940525027	Yuichi Takase	Fizzle
May 25 1994 03:40:29:650PM	940525028	Yuichi Takase	Good shot, disrupt @ 0.6sec. P_rf=600kW.
May 25 1994 03:58:32:910PM	940525029	Yuichi Takase	Early disruption @ 0.15sec.
May 25 1994 04:16:18:890PM	940525030	Yuichi Takase	Disrupted at 0.57sec. Lower power (300kW). Lower loading?
May 25 1994 04:22:36:070PM	940525031	Yuichi Takase	Lasted till 0.7sec. RF power being modulated. P_rf=400kW.
May 25 1994 04:36:05:630PM	940525032	Yuichi Takase	Died early @ 0.20sec.
May 25 1994 04:48:47:870PM	940525033	Yuichi Takase	Dud.
May 25 1994 05:10:03:840PM	940525034	Yuichi Takase	Died @ 0.18sec.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:05:34:810AM	Plasma	Ok	no faults
2	09:18:00:100AM	Plasma	Ok	no faults
3	09:39:20:510AM	Plasma	Ok	no faults
4	10:03:14:840AM	Plasma	Ok	no faults
5	10:20:05:760AM	Plasma	Ok	no faults
6	10:28:34:610AM	Plasma	Ok	no faults
7	10:40:00:800AM	Plasma	Ok	no faults
8	10:54:03:690AM	Plasma	Ok	no faults
9	11:05:47:930AM	Plasma	Ok	no faults
10	11:22:27:840AM	Plasma	Ok	no faults
11	11:37:30:100AM	Plasma	Ok	no faults
12	11:50:38:460AM	Plasma	Ok	no faults
13	12:02:00:440PM	Plasma	Ok	no faults
14	12:13:20:770PM	Plasma	Ok	no faults
15	12:31:24:170PM	Plasma	Ok	no faults
16	12:45:19:300PM	Plasma	Ok	no faults
17	12:57:14:380PM	Plasma	Ok	no faults
18	01:10:48:970PM	Plasma	Ok	comm fault OH2L Plasma 690 KA
19	01:25:49:430PM	Plasma	Ok	No faults
20	01:36:56:560PM	Plasma	Ok	Good shot No faults
21	01:52:56:610PM	Plasma	Ok	No Faults
22	02:02:43:620PM	Plasma	Ok	fizzle
23	02:17:16:170PM	Test	Ok	NO faults
24	02:31:56:200PM	Test	Ok	NO faults fizzle
25	02:46:39:610PM	Plasma	Ok	Fizzle No Faults
26	02:57:27:620PM	Plasma	Bad	dud No Faults.
27	03:10:09:270PM	Plasma	Ok	NO faults
28	03:22:20:260PM	Plasma	Ok	650KA Plasma no faults
29	03:42:29:330PM	Plasma	Ok	No faults Dud
30	03:54:27:840PM	Plasma	Ok	No faults 680KA Plasma
31	04:12:18:140PM	Test	Ok	Plasma shot O.K. No faults
32	04:31:02:120PM	Plasma	Ok	plasma shot no faults
33	04:42:54:250PM	Plasma	Ok	dud no faults
34	04:56:12:190PM	Plasma	Ok	Plasma shot no faults