Alcator C-Mod Run 1030506 Information

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Miniproposals
Miniproposal:
Date Filed:
Title:
First Author:
Session Leader:Steve Wukitch (shots 1-18)

Operators
Session leader(s):Steve Wukitch
Physics operator(s):Robert Granetz
Engineering operator(s):Bill Parkin,Ed Fitzgerald,Bill Cochran

Engineering Operator Run Comment
Purpose: RF Conditioning/Wukitch/Granetz/Cochran.

Session Leader Plans

Physics Operators Plans

Session Leader Summaries
Entered: Jul 7 2004 03:49:32:023PM
Author: To Be Determined
Engineering setup for Tuesday, 06 May 2003

Purpose: RF conditioning

Session leader: S. Wukitch
Physics operator: R. Granetz

ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00.
Bake at 60 C overnight as well, if possible.

**** NOTE ONE HOUR DELAY OF START TIME *****
Run begins at 10:00 and ends at 17:00.

Power systems the same as on 1030502025 (0.8 MA, 5.4 T, lower single null)

Gas setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid enabled (PG1)
fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC)
fill C-side with 30 psi D2 Hybrid enabled (PG3)

Enable the following gate valves, assuming no vacuum problems:
ECE, DNB, VUV

-------------------------------------------------------------------------------
RF Setup: All 4 transmitters in Run On by 08:00.
-------------------------------------------------------------------------------
Run Plan:
The start of the run will be delayed by one hour to allow for
some work on the D and E transmitters. We will start from the last shot on
Friday (typical Ip=0.8 MA, Bt=5.4 T, nl_04=1.0e20 m-2, lower single null).
Use all four transmitters. During the day we may try changing Ip and/or
Btor. We might also try some upper null configurations.
-------------------------------------------------------------------------------
001-004 data cycles and test shots

005 5.4 T, Ip=0.8, nl_04=0.8
D: 0.7 MW [1.0,1.5]
E: 0.7 MW
J: 0.5 MW [0.6,1.5]
result fizzle
006 5.4 T, Ip=0.8, nl_04=0.8
D: 0.7 MW [1.0,1.5] dummy load
E: 0.7 MW
J: 0.5 MW [0.6,1.5]
result plasma
D: 0.7 MW
E: 0.7 MW
J: 0.5 MW
tot: 1.9
009 5.4 T, Ip=0.8, nl_04=0.8
D: 0.7 MW [1.0,1.5]
E: 0.7 MW
J: 0.5 MW [0.6,1.5]
result plasma - brief h-mode
D: 0.7 MW
E: 0.7 MW no kalmus
J: 0.5 MW
tot: 1.2 MW
010 5.4 T, Ip=0.8, nl_04=0.8
D: 1.0 MW [1.0,1.5]
E: 0.7 MW
J: 0.5 MW [0.6,1.5]
result plasma - H-modes
D: 1.0 MW 8 faults
E: 0.7 MW 5 faults
J: 0.5 MW faults in H-mode
011 5.4 T, Ip=0.8, nl_04=0.8
D: 1.0 MW [1.0,1.5]
E: 0.7 MW
J: 0.5 MW [0.6,1.5]
result plasma - H-modes
D: 1.0 MW 8 faults
E: 0.7 MW 5 faults
J: 0.5 MW faults in H-mode
012 5.4 T, Ip=0.8, nl_04=0.8
D: 1.0 MW [1.0,1.5]
E: 0.7 MW
J: 0.5 MW [0.6,1.5]
result plasma - H-modes
D: 1.0 MW 8 faults
E: 0.7 MW 5 faults
J: 0.5 MW faults in H-mode

013 5.4 T, Ip=0.8, nl_04=0.8
D: 1.0 MW [1.0,1.5]
E: 0.7 MW
J: 1.5 MW [0.6,1.5]
result plasma - H-modes
D: 1.0 MW 8 faults
E: 0.7 MW 5 faults
J: 1.5 MW faults in H-mode
014 5.4 T, Ip=0.8, nl_04=0.8
D: 1.0 MW [1.0,1.5]
E: 0.7 MW
J: 1.5 MW [0.6,1.5]
result plasma - H-modes
D: 1.0 MW 8 faults
E: 0.7 MW 5 faults
J: 1.5 MW faults in H-mode
015 5.4 T, Ip=0.8, nl_04=0.8
D: 0 MW
E: 0.7 MW [1.0,1.5]
J: 1.5 MW [0.6,1.5]
result plasma - H-modes
D: 0 MW
E: 0.7 MW 5 faults
J: 1.5 MW faults in H-mode
016 5.4 T, Ip=0.8, nl_04=0.8
D: 0 MW
E: 0.7 MW [1.0,1.5]
J: 1.5 MW [0.6,1.5]
result plasma - H-modes
D: 0 MW
E: 0.7 MW clean
J: 1.5 MW faults in H-mode
017 5.4 T, Ip=0.8, nl_04=0.8
D: 0 MW
E: 1.0 MW [1.0,1.5]
J: 1.5 MW [0.6,1.5]
result fizzle
018 5.4 T, Ip=0.8, nl_04=0.8
D: 0 MW
E: 1.0 MW [1.0,1.5]
J: 1.5 MW [0.6,1.5]
result plasma - H-modes
D: 0 MW
E: 1.0 MW clean
J: 1.5 MW faults

Summary:
Athough the run was abbreviated, a couple of RF issues were addressed.
The vacuum conditioning prior to the run identified a problem with
J3DC1 as seen in the previous plasma runs. An anomaly in the S11
vanished after vacuum conditioning; however, the issue regarding J3DC1
is still unresolved. During plasma operation, we tuned J3 iteratively
and by the last shot had gotten a decent match.

Physics Operator Summaries
Entered: Jul 7 2004 04:37:17:677PM
Author: To Be Determined
Physics operator summary for run 1030506 (Tuesday):

RF conditioning

Session leader: S. Wukitch
Physics operator: R. Granetz
Engineers in charge: W. Cochran, E. Fitzgerald, W. Parkin

Summary: The start of plasma operation was delayed until around 14:00 today
due to several factors: RF work in the power room, MDSplus/network
problems, a TF power supply problem, and an OH2 commutation
problem. Once we began plasma operation, the machine worked well,
with only one disruption and one fizzle. All four transmitters
were being used today. The H/D started at 5% today, but rose to
8-11% after the RF started operating.

I've come to the conclusion that the so-called "bounce" spikes
during startup are actually dust/micrometeoroid injections, and
therefore not under physop control. The CHECK_MAGNETICS program
is now working automatically on Linux after each shot. The DNB
worked very well today, with V=49 kV and I=4-4.5 amps. Excellent
MSE signals.

Scorecard: 11 plasmas
2 fizzles
0 duds
5 test or no-power shot cycle
0 aborted and/or screwed up by computer problems
----------
18 total

-------------------------------------------------------------------------------

Engineering setup for Tuesday, 06 May 2003

Purpose: RF conditioning

Session leader: S. Wukitch
Physics operator: R. Granetz

ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00.
Bake at 60 C overnight as well, if possible.

**** NOTE ONE HOUR DELAY OF START TIME *****
Run begins at 10:00 and ends at 17:00.

Power systems the same as on 1030502025 (0.8 MA, 5.4 T, lower single null)

Gas setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid enabled (PG1)
fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC)
fill C-side with 30 psi D2 Hybrid enabled (PG3)

Enable the following gate valves, assuming no vacuum problems:
ECE, DNB

-------------------------------------------------------------------------------
RF Setup: All 4 transmitters in Run On by 08:00.

-------------------------------------------------------------------------------

Run Plan: The start of the run will be delayed by one hour to allow for
some work on the D and E transmitters. We will start from the last shot on
Friday (typical Ip=0.8 MA, Bt=5.4 T, nl_04=1.0e20 m-2, lower single null).
Use all four transmitters. During the day we may try changing Ip and/or
Btor. We might also try some upper null configurations.

-------------------------------------------------------------------------------

ECDC was done overnight, as well as a 60 C bake.

Hybrid coldstart done by the engineering group; no errors found

Loaded PCS from shot 1030502025 (0.8 MA, 5.4 T, single null lower)

-------------------------------------------------------------------------------

Since the RF was firing into the vacuum chamber before the run began,
I requested 10 minutes of ECDC before the first plasma shot.

A 15 V supply in one of the TF cabinets failed at 10:00. We will need
to take a no-power test shot to check the repair.

The run didn't actually start until ~11:30.

Shot 01 -- No-power test to check repair of 15 V supply in TF cabinet.
No engineering or magnetics data came through.

Shot 02 -- No-power shot cycle. No magnetics data came through. Josh
rebooted the magnetics cPCI (pcdaqmhd1.psfc.mit.edu) and stopped
the MHD_DAQ server. Engineers still need to go into the power
room to continue checking the TF supply.

Shot 03 -- No-power shot cycle. Got the magnetics data this time.

Shot 04 -- Test. This was supposed to be a 10 kA TF-only test, but the
alternator excitation was not turned on, so we didn't get any
current.

Next shot: Try the 10 kA TF-only test again.

Shot 05 -- Test. 10 kA TF-only test. OK.

Next shot: go for plasma (finally).

Time: 13:30

Shot 06 -- Fizzle. OH2's didn't charge up properly. Neither of the OH2
Switches closed. It's amazing we even got a breakdown.

Next shot: try for plasma again.

Shot 07 -- Plasma. Good shot. No RF (camac problem). Startup didn't have
any bounces, nor hard x-rays. H/D=5%

Next shot: repeat with RF

Shot 08 -- Plasma. Good shot. No RF (camac init problem). Beautiful
startup. No hard x-rays. H/D=6%

Next shot: repeat with RF (hopefully)

Shot 09 -- Plasma. Good shot. Prf=1.2 MW (D,J). Got a short H-mode.
H/D=6-10% (rising during RF).

Next shot: repeat with all RF transmitters.

Shot 10 -- Plasma. Good shot. Startup had a bounce and almost didn't make
it. There were hard x-rays too. But prior to the bounce,
everything looks identical. Maybe the spike is really a small
brick, not a bounce. Prf=1-2 MW (D,E,J). Two short H-modes.
H/D=8-10%

Next shot: reduce pre-fill puff by 1 ms.

Shot 11 -- Plasma. Disrupted at t=1.1 s. Much better startup. Prf=1-2.6 MW
(D,E,J). H/D=8-10%.

Next shot: reduce pre-fill by 2 ms to compensate for disruption.

Shot 12 -- Plasma. Good shot. Lots of short H-modes. Double-bounce startup.
Prf=1-2+ MW (D,E,J). H/D=8-12%

Next shot: increase pre-fill by 1 ms.

Shot 13 -- Plasma. Good shot. Lots of short H-modes. Another double-bounce
startup. Some hard x-rays. Prf=2.0 MW (D,E). H/D=8-11%

Next shot: Move outer strike point lower by reducing RXL by 5 mm
at the request of Brian.

Shot 14 -- Plasma. Good shot. Lots of short H-modes. Startup had multiple
"bounces", or maybe dusty injections, but almost no hard x-rays.
Prf=2 MW (D,E). H/D=10-12%. Outer strike point only moved down
by 1-2 mm.

Next shot: reduce RXL again, this time by a full 1 cm.

Shot 15 -- Plasma. Good shot. Two miniscule H-modes. Prf= ~1 MW (E,J).
No hard x-rays. H/D=8-10%. Outer strike point moved down by just
about 1 cm.

Next shot: increase argon puff from to 50 ms (from 40 ms).

Shot 16 -- Plasma. Good shot. Prf= ~1 MW (J,E). H/D=8-10%.

Next shot: increase RXL by +5 mm to raise outer strikepoint about
halfway back. Reduce pre-fill by 1 ms.

Shot 17 -- Fizzle. Big injection at 30 ms killed the startup (at 70 kA).

Next (final) shot: no PCS changes.

Shot 18 -- Plasma. Good shot. No H-modes. Prf= ~1 MW (E,J). H/D=10-11%.

End of run.

Session Leader Comments
May 8 2003 11:34:21:393AMSteve WukitchSummary:
Athough the run was abbreviated, a couple of RF issues were addressed.
The vacuum conditioning prior to the run identified a problem with
J3DC1 as seen in the previous plasma runs. An anomaly in the S11
vanished after vacuum conditioning; however, the issue regarding J3DC1
is still unresolved. During plasma operation, we tuned J3 iteratively
and by the last shot had gotten a decent match.
May 8 2003 09:38:47:980AM1030506005Steve Wukitch005 5.4 T, Ip=0.8, nl_04=0.8
D: 0.7 MW [1.0,1.5]
E: 0.7 MW
J: 0.5 MW [0.6,1.5]
result fizzle
May 8 2003 09:39:21:323AM1030506006Steve Wukitch006 5.4 T, Ip=0.8, nl_04=0.8
D: 0.7 MW [1.0,1.5] dummy load
E: 0.7 MW
J: 0.5 MW [0.6,1.5]
result plasma
D: 0.7 MW
E: 0.7 MW
J: 0.5 MW
tot: 1.9
May 8 2003 09:39:41:603AM1030506009Steve Wukitch009 5.4 T, Ip=0.8, nl_04=0.8
D: 0.7 MW [1.0,1.5]
E: 0.7 MW
J: 0.5 MW [0.6,1.5]
result plasma - brief h-mode
D: 0.7 MW
E: 0.7 MW no kalmus
J: 0.5 MW
tot: 1.2 MW
May 8 2003 09:47:43:067AM1030506010Steve Wukitch010 5.4 T, Ip=0.8, nl_04=0.8
D: 1.0 MW [1.0,1.5]
E: 0.7 MW
J: 0.5 MW [0.6,1.5]
result plasma - H-modes
D: 1.0 MW 8 faults
E: 0.7 MW 5 faults
J: 0.5 MW faults in H-mode
May 8 2003 09:40:32:933AM1030506011Steve Wukitch011 5.4 T, Ip=0.8, nl_04=0.8
D: 1.0 MW [1.0,1.5]
E: 0.7 MW
J: 0.5 MW [0.6,1.5]
result plasma - H-modes
D: 1.0 MW 8 faults
E: 0.7 MW 5 faults
J: 0.5 MW faults in H-mode
May 8 2003 09:41:22:073AM1030506012Steve Wukitch012 5.4 T, Ip=0.8, nl_04=0.8
D: 1.0 MW [1.0,1.5]
E: 0.7 MW
J: 0.5 MW [0.6,1.5]
result plasma - H-modes
D: 1.0 MW 8 faults
E: 0.7 MW 5 faults
J: 0.5 MW faults in H-mode
May 8 2003 09:41:47:310AM1030506013Steve Wukitch013 5.4 T, Ip=0.8, nl_04=0.8
D: 1.0 MW [1.0,1.5]
E: 0.7 MW
J: 1.5 MW [0.6,1.5]
result plasma - H-modes
D: 1.0 MW 8 faults
E: 0.7 MW 5 faults
J: 1.5 MW faults in H-mode
May 8 2003 09:42:01:747AM1030506014Steve Wukitch014 5.4 T, Ip=0.8, nl_04=0.8
D: 1.0 MW [1.0,1.5]
E: 0.7 MW
J: 1.5 MW [0.6,1.5]
result plasma - H-modes
D: 1.0 MW 8 faults
E: 0.7 MW 5 faults
J: 1.5 MW faults in H-mode
May 8 2003 09:45:52:220AM1030506015Steve Wukitch015 5.4 T, Ip=0.8, nl_04=0.8
D: 0 MW
E: 0.7 MW [1.0,1.5]
J: 1.5 MW [0.6,1.5]
result plasma - H-modes
D: 0 MW
E: 0.7 MW 5 faults
J: 1.5 MW faults in H-mode
May 8 2003 09:48:19:660AM1030506016Steve Wukitch016 5.4 T, Ip=0.8, nl_04=0.8
D: 0 MW
E: 0.7 MW [1.0,1.5]
J: 1.5 MW [0.6,1.5]
result plasma - H-modes
D: 0 MW
E: 0.7 MW clean
J: 1.5 MW faults in H-mode
May 8 2003 09:48:32:083AM1030506017Steve Wukitch017 5.4 T, Ip=0.8, nl_04=0.8
D: 0 MW
E: 1.0 MW [1.0,1.5]
J: 1.5 MW [0.6,1.5]
result fizzle
May 8 2003 09:49:26:240AM1030506018Steve Wukitch018 5.4 T, Ip=0.8, nl_04=0.8
D: 0 MW
E: 1.0 MW [1.0,1.5]
J: 1.5 MW [0.6,1.5]
result plasma - H-modes
D: 0 MW
E: 1.0 MW clean
J: 1.5 MW faults

Physics Operator Comments
May 6 2003 08:29:52:923AMRobert GranetzEngineering setup for Tuesday, 06 May 2003

Purpose: RF conditioning

Session leader: S. Wukitch
Physics operator: R. Granetz

ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00.
Bake at 60 C overnight as well, if possible.

**** NOTE ONE HOUR DELAY OF START TIME *****
Run begins at 10:00 and ends at 17:00.

Power systems the same as on 1030502025 (0.8 MA, 5.4 T, lower single null)

Gas setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid enabled (PG1)
fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC)
fill C-side with 30 psi D2 Hybrid enabled (PG3)

Enable the following gate valves, assuming no vacuum problems:
ECE, DNB, VUV

-------------------------------------------------------------------------------
RF Setup: All 4 transmitters in Run On by 08:00.

-------------------------------------------------------------------------------

Run Plan: The start of the run will be delayed by one hour to allow for
some work on the D and E transmitters. We will start from the last shot on
Friday (typical Ip=0.8 MA, Bt=5.4 T, nl_04=1.0e20 m-2, lower single null).
Use all four transmitters. During the day we may try changing Ip and/or
Btor. We might also try some upper null configurations.
May 6 2003 08:45:32:290AMRobert Granetz ECDC was done overnight, as well as a 60 C bake.

Hybrid coldstart done by the engineering group; no errors found

Loaded PCS from shot 1030502025 (0.8 MA, 5.4 T, single null lower)
May 6 2003 09:53:10:817AMRobert Granetz Since the RF was firing into the vacuum chamber before the run began,
I requested 10 minutes of ECDC before the first plasma shot.

May 6 2003 11:36:34:587AMRobert GranetzA 15 V supply in one of the TF cabinets failed at 10:00. We will need
to take a no-power test shot to check the repair.

The run actually started at ~11:30.
May 6 2003 11:55:09:067AM1030506001Robert GranetzShot 01 -- No-power test to check repair of 15 V supply in TF cabinet.
No engineering or magnetics data came through.
May 6 2003 01:18:41:760PM1030506002Robert GranetzShot 02 -- No-power shot cycle. No magnetics data came through. Josh
rebooted the magnetics cPCI (pcdaqmhd1.psfc.mit.edu) and stopped
the MHD_DAQ server. Engineers still need to go into the power
room to continue checking the TF supply.
May 6 2003 01:19:08:167PM1030506003Robert GranetzShot 03 -- No-power shot cycle. Got the magnetics data this time.
May 6 2003 01:24:12:190PM1030506004Robert GranetzShot 04 -- Test. This was supposed to be a 10 kA TF-only test, but the
alternator excitation was not turned on, so we didn't get any
current.

Next shot: Try the 10 kA TF-only test again.
May 6 2003 01:29:55:760PM1030506005Robert GranetzShot 05 -- Test. 10 kA TF-only test. OK.

Next shot: go for plasma (finally).

Time: 13:30
May 6 2003 01:50:46:183PM1030506006Robert GranetzShot 06 -- Fizzle. OH2's didn't charge up properly. Neither of the OH2
Switches closed. It's amazing we even got a breakdown.

Next shot: try for plasma again.
May 6 2003 02:12:23:760PM1030506007Robert GranetzShot 07 -- Plasma. Good shot. No RF (camac problem). Startup didn't have
any bounces, nor hard x-rays. H/D=5%

Next shot: repeat with RF
May 6 2003 02:28:32:770PM1030506008Robert GranetzShot 08 -- Plasma. Good shot. No RF (camac init problem). Beautiful
startup. No hard x-rays. H/D=6%

Next shot: repeat with RF (hopefully)
May 6 2003 02:43:05:043PM1030506009Robert GranetzShot 09 -- Plasma. Good shot. Prf=1.2 MW (D,J). Got a short H-mode.
H/D=6-10% (rising during RF).

Next shot: repeat with all RF transmitters.
May 6 2003 03:14:09:357PM1030506010Robert GranetzShot 10 -- Plasma. Good shot. Startup had a bounce and almost didn't make
it. There were hard x-rays too. But prior to the bounce,
everything looks identical. Maybe the spike is really a small
brick, not a bounce. Prf=1-2 MW (D,E,J). Two short H-modes.
H/D=8-10%

Next shot: reduce pre-fill puff by 1 ms.
May 6 2003 03:31:21:210PM1030506011Robert GranetzShot 11 -- Plasma. Disrupted at t=1.1 s. Much better startup. Prf=1-2.6 MW
(D,E,J). H/D=8-10%.

Next shot: reduce pre-fill by 2 ms to compensate for disruption.
May 6 2003 03:44:04:637PM1030506012Robert GranetzShot 12 -- Plasma. Good Shot. Lots of short H-modes. Double-bounce startup.
Prf=1-2+ MW (D,E,J). H/D=8-12%

Next shot: increase pre-fill by 1 ms.
May 6 2003 04:00:18:430PM1030506013Robert GranetzShot 13 -- Plasma. Good shot. Lots of short H-modes. Another double-bounce
startup. Some hard x-rays. Prf=2.0 MW (D,E). H/D=8-11%

Next shot: Move outer strike point lower by reducing RXL by 5 mm
at the request of Brian.
May 6 2003 04:14:44:047PM1030506014Robert GranetzShot 14 -- Plasma. Good shot. Lots of short H-modes. Startup had multiple
"bounces", or maybe dusty injections, but almost no hard x-rays.
Prf=2 MW (D,E). H/D=10-12%. Outer strike point only moved down
by 1-2 mm.

Next shot: reduce RXL again, this time by a full 1 cm.
May 6 2003 04:28:09:550PM1030506015Robert GranetzShot 15 -- Plasma. Good shot. Two miniscule H-modes. Prf= ~1 MW (E,J).
No hard x-rays. H/D=8-10%. Outer strike point moved down by just
about 1 cm.

Next shot: increase argon puff from to 50 ms (from 40 ms).
May 6 2003 04:46:59:423PM1030506016Robert GranetzShot 16 -- Plasma. Good shot. Prf= ~1 MW (J,E). H/D=8-10%.

Next shot: increase RXL by +5 mm to raise outer strikepoint about
halfway back. Reduce pre-fill by 1 ms.
May 6 2003 04:54:15:310PM1030506017Robert GranetzShotShot 17 -- Fizzle. Big injection at 30 ms killed the startup (at 70 kA).

Next (final) shot: no PCS changes.
May 6 2003 05:12:25:260PM1030506018Robert GranetzShot 18 -- Plasma. Good shot. No H-modes. Prf= ~1 MW (E,J). H/D=10-11%.

End of run.

Engineering Operator Comments
ShotTimeTypeStatusComment
111:38:55:810AMTestBadData System Problems
211:55:25:943AMTestBadCamac system test
312:57:52:867PMTestOkTF No power test to check gates
401:17:39:740PMTestBadNo excitation, operator error
501:26:27:490PMTestOkTF 10kA test
601:41:19:247PMPlasmaBadOH2 comm switch did not fire
701:58:30:787PMPlasmaOk
802:17:26:630PMPlasmaOk
902:33:45:840PMPlasmaOk
1003:00:34:257PMPlasmaOk
1103:16:13:580PMPlasmaOk
1203:32:23:540PMPlasmaOk
1303:46:29:220PMPlasmaOk
1404:02:10:150PMPlasmaOk
1504:17:29:800PMPlasmaOk
1604:32:05:307PMPlasmaOk
1704:48:19:050PMPlasmaOk
1805:00:54:273PMPlasmaOk