Alcator C-Mod Run 1050216 Information

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Miniproposals
Miniproposal:355
Date Filed:11/12/2003
Title:ICRF Testing & Conditioning
First Author:Steve Wukitch
Session Leader:Steve Wukitch (shots 1-18)

Operators
Session leader(s):Steve Wukitch
Physics operator(s):Ian Hutchinson,Jim Irby
Engineering operator(s):Gary Dekow,Andy Pfeiffer,Bill Byford,Ed Fitzgerald

Engineering Operator Run Comment
automatically entered by signon - please replace with real comment

Session Leader Plans
Entered: Feb 16 2005 10:34:07:050AM
Author: Steve Wukitch
MP#355:
SL: Wukitch
PO: Hutchinson

---------------------------------------------------------
Plan:

Two words will describe it: simple and dull. Obtain as many
discharges as possible to plasma condition D and E antennas. Start
with vanilla LSN, 5.4 T, Ip=0.8 MA, nl_04=0.8 target discharge
(1050215007). Upper null discharges can be run if parties are
interested (1050215009 is a good starting point). The aim is to get 1
MW from each for 0.5 sec then combine and maximize injected power.
Monitor density and impurity evolution for trends with RF power.
---------------------------------------------------------

Physics Operators Plans
Entered: Feb 16 2005 10:34:48:300AM
Author: Steve Wukitch
MP#355:
SL: Wukitch
PO: Hutchinson

Overnight ECDC in D2, bake at 60C

Engineering setup:
Power systems as on 1050215007

Gas setup:
-----------
> fill B-Top with 6 psi D2 Hybrid Enabled (PG4)
> fill B-side lower with 1 psi Ar Hybrid DISabled (PG1)
> fill B-side upper with 30 psi D2 Hybrid DISabled (PG2)
> fill (former) C-side with 30 psi D2 Hybrid Enabled (PG3)

Torvac Setup:
--------------
GV1 closed, Bypass to RGA open
Torus gate valves closed in Pulse for 5min after shot

Gate valves:
ECE (assuming no vac problems) and Z-bolo/shutter open

---------------------------------------------------------
Plan:

Two words will describe it: simple and dull. Obtain as many
discharges as possible to plasma condition D and E antennas. Start
with vanilla LSN, 5.4 T, Ip=0.8 MA, nl_04=0.8 target discharge
(1050215007). Upper null discharges can be run if parties are
interested (1050215009 is a good starting point). The aim is to get 1
MW from each for 0.5 sec then combine and maximize injected power.
Monitor density and impurity evolution for trends with RF power.
---------------------------------------------------------

Session Leader Summaries
Entered: Feb 16 2005 07:06:35:310PM
Author: Steve Wukitch
Run Summary

Continued plasma conditioning of E antenna and began conditioning of D
antenna. E antenna coupled 1.4 MW for ~0.5 sec with a couple of
faults on 016. D antenna struggled and may benefit from vacuum
conditioning before continuing with plasma discharges. The density
rise associated with E antenna was higher at low target density than
with higher. This maybe worth some investigation. Neither antenna is
conditioned well enough for physics operation.

Physics Operator Summaries
Entered: Feb 16 2005 07:20:28:073PM
Author: Jim Irby
On shot 8 we went to an upper null configuration and the h/(h+d) rose from 15 to 30%. The good news
is that it then began to trend downward and was down to approximately 20% by shot 16. Unfortunately the
physop didn't figure out a field tweak was required and produced fizzles on shot 17 and 18. We also
lost pressue gauge measurements for the last few shots of the night, though they were back on shot 18.

problems:

. we should check out the pressure gauge crates/camac tomorrow before the run
Entered: Feb 16 2005 07:37:17:577PM
Author: Ian Hutchinson
Summary
A tough day with the power supplies which were the cause of most of the problems
to do with startup.

Scorecard 



  Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax
      1   1.977   0.825      2   1.974   0.833 
      3   0.000   0.015      4   0.000   0.002 
      5   0.000   0.006      6   1.973   0.834 
      7   1.974   0.833      8   1.969   0.827 
      9   0.000   0.019     10   0.000   0.019 
     11   0.000   0.002     12   1.970   0.828 
     13   1.964   0.822     14   1.966   0.823 
     15   0.000   0.040     16   1.962   0.824 
     17   0.000   0.042     18   0.000   0.041 
 
Finished summary for     1050216 Total of 18 shots.
18 shots.  9 plasmas.   2 fizzles.  7 PS duds.


Session Leader Comments
Feb 16 2005 02:06:10:123PM1050216001Steve Wukitch001 BT~5.4T, Ip~0.8 MA, nl06~0.6, LSN
D: 0.3 MW [0.6,1.5]sec
E: 1.0 MW [1,1.5]sec
result: plasma
D: max faults
E: max faults
#1 xbarred after plasma pulse
next shot: retune and retry
Feb 16 2005 02:05:44:637PM1050216002Steve Wukitch002 BT~5.4T, Ip~0.8 MA, nl06~0.6, LSN
D: 0.3 MW [0.6,1.5]sec
E: 1.0 MW [1,1.5]sec
result: plasma
D: max faults but ran longer
E: 6 faults
NS: retry
Feb 16 2005 01:34:18:013PM1050216003Steve WukitchPF breaker (EF1) pulled
Feb 16 2005 01:34:28:730PM1050216004Steve Wukitch004 test
Feb 16 2005 01:34:42:577PM1050216005Steve Wukitch005 test
Feb 16 2005 02:05:15:980PM1050216006Steve Wukitch006 BT~5.4T, Ip~0.8 MA, nl06~0.6, LSN
D: 0.3 MW [0.6,1.5]sec
E: 1.0 MW [1,1.5]sec
result: plasma
D: max faults but ran longer
E: 1 fault
NS: change gate on D to allow more than 9 retries
Feb 16 2005 03:13:04:967PM1050216007Steve Wukitch007 BT~5.4T, Ip~0.8 MA, nl04~0.6
D: 0.3 MW [0.6,1.5]sec
E: 1.2 MW [1,1.5]sec
result: plasma
D: max faults
E: 1.3 MW 7 faults
Feb 16 2005 04:12:35:513PM1050216008Steve Wukitch008 BT~5.4T, Ip~0.8 MA, nl04~0.6, USN
D: 0.3 MW [0.6,1.5]sec
E: 1.2 MW [1,1.5]sec
result: plasma
D: max faults
E: 1.3 MW 1 fault
Feb 16 2005 04:46:30:357PM1050216009Steve Wukitch009 BT~5.4T, Ip~0.8 MA, nl04~0.6
D: 0.3 MW [0.6,1.5]sec
E: 1.5 MW [1,1.5]sec
result: NTP - no OH1
Feb 16 2005 04:58:31:997PM1050216010Steve Wukitch010 repeat of 009
Feb 16 2005 05:44:17:560PM1050216011Steve Wukitch011 NTP
Feb 16 2005 05:49:38:967PM1050216012Steve Wukitch012 BT~5.4T, Ip~0.8 MA, nl04~0.6
D: 0.3 MW [0.6,1.5]sec
E: 1.2 MW [1,1.5]sec
result: plasma
D: max faults
E: 3 faults
Feb 16 2005 06:02:05:387PM1050216013Steve Wukitch013 BT~5.4T, Ip~0.8 MA, nl04~0.6
D: 0.3 MW [0.6,1.5]sec
E: 1.2 MW [1,1.5]sec
result: plasma
D: max faults
E: 4 xmtr not ready pauses - excessive screen current/low screen voltage
reduce power on E
Feb 16 2005 06:10:09:403PM1050216014Steve Wukitch014 BT~5.4T, Ip~0.8 MA, nl04~0.6
D: 0.3 MW [0.6,1.5]sec
E: 1.2 MW [1,1.5]sec
result: plasma
D: max faults
E: 7 faults
Feb 16 2005 06:37:15:793PM1050216015Steve Wukitch015 NTP
Feb 16 2005 06:40:40:153PM1050216016Steve Wukitch016 BT~5.4T, Ip~0.8 MA, nl04~0.6
D: 1.0 MW [0.6,1.5]sec
E: 1.2 MW [1.1,1.5]sec
result: plasma
D: max faults - faults at 0.5 MW
E: 2 faults
Feb 16 2005 07:02:04:903PM1050216017Steve Wukitch017 NTP
Feb 16 2005 07:02:11:170PM1050216018Steve Wukitch018 NTP

Physics Operator Comments
Feb 16 2005 12:04:59:080PMIan HutchinsonLoad from shot 1050215007.
Load/clean
Feb 16 2005 12:30:16:487PM1050216001Ian HutchinsonPlasma.
Feb 16 2005 12:46:34:173PM1050216002Ian HutchinsonPlasma.
Feb 16 2005 12:47:13:797PM1050216003Ian HutchinsonDud PF breaker out. No currents worth a fig.
Feb 16 2005 02:19:40:890PM1050216005Ian HutchinsonPlasma.
Feb 16 2005 04:15:35:060PM1050216007Ian HutchinsonPlasma

Enable B-side lower. Draw PG1 pulse to 30ms, for Argon puff.
Load 1050215009 into model. This is the upper null plasma.
Feb 16 2005 04:45:39:043PM1050216008Ian HutchinsonPlasma upper null

Increase Ar puff from 50ms to 80ms.
Feb 16 2005 04:58:06:950PM1050216009Ian HutchinsonDud. No OH1.
Feb 16 2005 07:27:14:327PM1050216010Ian HutchinsonNo OH1. Dud.
Feb 16 2005 05:48:16:450PM1050216012Jim Irbyplasma into rampdown


Feb 16 2005 06:06:52:497PM1050216013Jim Irbyraised nl_04 request from 0.5 to 0.6e20 /m^2

plasma into rampdown

h/(h+d) has been holding pretty steady at about 28% since we when upper null
Feb 16 2005 06:30:53:780PM1050216014Jim Irbyno DPCS changes

plasma into rampdown

lost data on pressure gauges


Feb 16 2005 07:03:24:780PM1050216015Jim Irbydud


no pressure measurements!
Feb 16 2005 06:42:11:030PM1050216016Jim Irbygp4 from 16 to 19 ms (flying blind)

plasma into rampdown

actually beginning to see a trend downward in h/(h+d)
Feb 16 2005 06:47:07:683PM1050216017Jim Irbyfizzle --- wolfe says I should have fixed the startup

Feb 16 2005 07:02:50:060PM1050216018Jim Irbypg4 from 19 to 17 ms

fizzle

breakdown very late

probably did need field tweak....

EOT

Engineering Operator Comments
ShotTimeTypeStatusComment
112:13:19:017PMPlasmaOk
212:27:37:627PMPlasmaOk
312:44:36:737PMPlasmaBadef1 1scr not conducting
401:23:12:700PMTestBadsetup incorrect retest ef1 lower
501:33:32:920PMTestOkef1 lower bridge tested ok
601:45:07:467PMPlasmaOk
702:54:25:187PMPlasmaOk
804:05:18:357PMPlasmaOk
904:42:54:090PMPlasmaBadNo OH1 Supply
1004:56:02:387PMPlasmaBadNo OH1 Supply
1105:31:59:950PMTestOk
1205:40:43:607PMPlasmaOk
1305:54:01:467PMPlasmaOk
1406:06:36:560PMPlasmaOk
1506:19:20:310PMPlasmaOk
1606:32:03:653PMPlasmaOk
1706:44:44:590PMPlasmaOk
1806:57:27:420PMPlasmaOk