Alcator C-Mod Run 1020628 Information

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Miniproposals
Miniproposal:298a
Date Filed: 5/20/2002
Title:C-Mod Plasma Startup
First Author:Jim Irby
Session Leader:Jim Irby (shots 1-23)

Operators
Session leader(s):Jim Irby
Physics operator(s):Robert Granetz
Engineering operator(s):Ed Fitzgerald,Gary Dekow

Engineering Operator Run Comment
Plasma Startup MP298A; SL:Irby; PO:Granetz; EO:Dekow/Fitzgerald

Session Leader Plans

Physics Operators Plans

Session Leader Summaries
Entered: Jul 7 2004 03:49:29:007PM
Author: To Be Determined
Run Summary for 1020628: Plasma Conditioning Continued

SL: Dekow/Fitzgerald
PO: Granetz
SL: Irby/Wolfe

This was a very good run with the machine finally cleaning up enough to
get more full length discharges than fizzles.

We began with a successful test of the EF3 supply under PLC control.
A bad SCR was replaced before the run.

We continued double null discharges on shots 03 and 06. On shot
09 we reloaded a lower null divertor shot to compare with the upper
null case. The H-to-D ratio did not change appreciably between the
two case. The amount of gas required to maintain the 1e20 /m^2 density
was also very similar. Turning off the gas beyond 1.0 s did not result
in a decrease in the density at any point in the run today.

Steve Wolfe estimates we have had about 45 discharge seconds so far
during this campaign. The H-to-D ratio is approximately 20% at 1.5
seconds; dropping from 30% during run 1020626. We typically have required
more than 100 discharge seconds to reduce the H-to-D enough to boronize.
It is still not clear whether or not we have gained any benefit from
baking the BN tiles. We may find out only by running discharges until the
H-to-D finally drops below 10% or saturates at a higher level.
We hope to complete the cleanup by the second run day next week and
then boronize on July 8 or 9.

A comparison of the upper and lower pressure gauges clearly indicates
we can control the relative pressures by moving the plasma from double
to single null. Brian also ran the flapper at BC and was able to see
the pressure modulation very clearly on the new Penning gauge there.
However, the pressure indicated by the gauge was 60 to 100 mTorr, and needs
to be checked out for proper calibration/operation.

The rf group began running j-port into discharges today at 1.25 s. Approx
30 to 40 kW of net power was used for tuneup.

Amanda reports that the radial scan of the ECE is complete and she
can do her calibration.

We lost shot 17 because of and IOC fault on the TF before the shot.

Score:

duds 08,15

fizzles 02,04,05,07,11

plasmas 03,06,09,10,12,13,16,19,20,21,22,23

eng 14,17

tests 01

lost 18

Physics Operator Summaries
Entered: Jul 7 2004 04:37:15:177PM
Author: To Be Determined
Physics operator summary for run 1020628 (Friday):

Session leader: J. Irby
Physics operator: R. Granetz
Engineer in charge:

Summary: A good day, with machine startup reliability improving markedly.
We started with a couple of high-triangularity, double-null
discharges and then switched back to a normal lower-single-null
configuration, with the intent of comparing the H/D ratio. We
didn't see much difference...for both configurations H/D was
0.15-0.20. See Jim's session summary for more info. As the day
progressed, we turned on the A and F scanning probes, the flappers,
NINJA puffing, and even some low-power RF from J-port.

Note for physops: firing the RF between shots into vacuum
has a very high probability of causing a dud unless ECDC is done
after the RF.

The DNB did not operate today because of a problem with the charging
supply.

Scorecard: 12 plasmas
5 fizzles
2 duds
1 tests
3 aborted and/or screwed up by computer problems
----------
23 total

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

Engineering setup for Friday 28 June 2002

Session leader: J. Irby
Physics operator: R. Granetz

ECDC overnight in D2 at 2e-4 Torr, stopping by 8:00 am.
Set up for possible ECDC in D2 between shots.

Run begins at 09:00 and ends at 17:00.

Power systems the same as for shot 1020626027

Note: We'll have to start with an EF3 test, due to the blown fuse on Thursday.

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)
leave J-Bottom as is Hybrid DISABLED (PG5)

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

-------------------------------------------------------------------------------
RF Setup: Xmtr #3 and 4 in Run On by 06:30

-------------------------------------------------------------------------------
Run Plan:

Note: We'll have to start with an EF3 test, due to the blown fuse on Thursday.

Compare H/D ratio in high-triangularity, nearly double-null plasmas with
H/D ratio in standard triangularity, lower single-null plasmas.

Start from 1020626027 (high-triangularity, nearly double-null)
We may want ECDC in D2 between shots.

We'll switch to segment 2 of shot 1020620008 for the standard shaped plasma,
with the caveat that the density programming will have to be matched to
the highly shaped shot.

RF may do conditioning of J-port into vacuum between shots.

-------------------------------------------------------------------------------
Overnight ECDC in D2 was done.

Hybrid coldstart done by Jim Irby earlier this morning; no errors found
at that time. But I just tried it and I got an error about an
unreachable node. Steve Wolfe is checking into it.

Loaded PCS from shot 1020626027, but changed density demand to drop
negative after t=1.0 s (per request of Jim Irby).

The DNB HV charging supply (CHAPS) won't turn on. No beam for now.

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

Shot 01 -- Test. EF3 under PLC control to check fuse repair. 1.7 kA, OK

Next shot: go for plasma.

Shot 02 -- Fizzle. Fields and gas look fine.

Next shot: no changes.

There is a delay now to investigate an alternator fault condition.

Shot 03 -- Plasma. Disrupted late in rampdown. nl_04 = 1.0 - 1.2 e20 m-2.
Double-null, delta_L=delta_U=0.8. Ip=0.76 MA, Btor=5.3 T.
H/D=0.15 at t=1.5 s.

Next shot: repeat, no changes

Shot 04 -- Fizzle. Fields and gas look fine.

Next shot: repeat, no changes. RF tree will be included.

Shot 05 -- Fizzle. Bz is a little high.

Next shot: Add -10 amps to IC_EF4.

There is a delay now for Jim Irby to work on the TCI laser.

Shot 06 -- Plasma. Good shot. Double-null, delta_L=delta_U=0.8.
H/D=0.20 at t=1.5 s.

Next shot: switch to standard single-null plasma shape, pulse the
RF between shots, and reduce pre-fill gas puff by 1 ms.
Load segment 2 with seg 2 from 1020620008, and then load wire 14
(nl_04) from the last shot (1020628006).

RF has started firing pulses between shots.

Shot 07 -- Fizzle. Gas was still a little high.

Next shot: reduce pre-fill another 2 ms.

Dexter and Bill are replacing one of the DNB supply components, using a spare
provided by the BINP team.

Shot 08 -- Dud. There was gas, so perhaps it was due to the RF firing
between shots.

Next shot: no changes, after 10 minutes of ECDC

Start between-shot ECDC in D2.

Shot 09 -- Plasma. Standard lower-single null shape (kappa=1.65, delta_L=0.5).
nl_04=1.0e20 m-2. H/D=0.16 at t=1.5 s. Jim Irby reports that
it took a similar amount of gas to fuel this discharge compared to
the double-null, high-triangularity discharges earlier today.
There was a failure of some magnetics DAQ after t=1.3 s.

Next shot: no changes, no between-shot ECDC, no between-shot RF.

Shot 10 -- Plasma. Nearly identical to last shot. H/D=0.20 at t=1.5 s.

Next shot: no changes, no between-shot ECDC, no between-shot RF.

Shot 11 -- Fizzle. Br0 was a bit high, but it seems to be bouncing around
a little on its own.

Next shot: reduce Br0 offset by 0.5 mT. No between-shot ECDC,
not between-shot RF.

Shot 12 -- Plasma. SNL, 0.76 MA, 5.3 T, 1.0e20 m-2. H/D=0.20 at t=1.5 s.
Br0 is a bit low, but I'll leave it alone.

Next shot: no changes.

Resume firing RF pulses between shots.

Shot 13 -- Plasma. SNL, 0.76 MA, 5.3 T, 1.0e20 m-2. H/D=0.22 at t=1.5 s.

Next shot: no changes, still no between-shot ECDC.

RF is firing between shots.

Shot 14 -- Aborted. IOC faults from 3 of the TF cabinets.

RF is firing between shots.

Shot 15 -- Dud. RF?

Next shot: no changes.

RF is firing between shots.
Between-shot ECDC is going after the RF finishes.

Shot 16 -- Plasma. SNL, 0.76 MA, 5.3 T, 1.0e20 m-2. H/D=0.17 at t=1.5 s.
There was a failure of some magnetics DAQ after t=1.3 s.

Next shot: Brian will be firing both the A and F scanning probes
at t=0.8, 1.0, and 1.2 s. The RF will fire both J-port
transmitters at t=1.25 s.

RF is firing between shots.
Between-shot ECDC is going after the RF finishes.

Shot 17 -- Aborted. There was a fault from the alternator.

Next shot: try again. RF (J-port), scanning probes (A and F), and
flappers too.

Shot 18 -- Aborted. Nothing fired. MDS problems.

Shot 19 -- Plasma. SNL, 0.76 MA, 5.3 T, 1.0e20 m-2. H/D=0.17 at t=1.5 s.
The A and F probes fired with no problems. Prf=20 kW net for
about 20 ms.

Next shot: no PCS changes. Scanning probes, flappers, and
RF will fire again. Some NINJA puffing too.

Shot 20 -- Plasma. SNL, 0.76 MA, 5.3 T, 1.0e20 m-2. H/D=0.18 at t=1.5 s.
We had probe scans, flappers, NINJA puffs, and RF. Prf=45 kW for
20 ms. Density is starting to creep up after 1 s.

Next shot: no PCS changes. Scanning probes, flappers, and
RF will fire again. Some NINJA puffing too.

Shot 21 -- Plasma. Same-o, same-o. Pleasently boring. H/D=0.19 at t=1.5 s.
Prf=38 kW for 30 ms.

Next shot: repeat everything again

Shot 22 -- Plasma. We're on a roll. Prf=58 kW for 10 ms. H/D=0.20 at t=1.5 s.

Next shot: repeat everything again.

Shot 23 -- Plasma. Another good one. H/D=0.20 at t=1.5 s. Prf=30 kW for
40 ms.

End of run.

Session Leader Comments
Jun 28 2002 09:18:15:110AM1020628001Jim IrbyDensity dropped to -5e19/m^2 beyond 1.0 s ----- see if density goes down

First shot will be EF3 test under PLC control

Jun 28 2002 09:53:55:587AM1020628002Jim IrbyFizzle --- but 40 kA --- nearly went

Carbon II .003

Jun 28 2002 10:45:32:180AM1020628003Jim IrbyPlasma to 1.76 s

Carbon II .003

H/D 16% at 1.5 s

Density still rising at 1.0 s with gas off
Jun 28 2002 11:20:14:267AM1020628005Jim IrbyAnother fizzle

Carbon still low

Delay to fix Granetz Beam
Jun 28 2002 11:36:36:667AM1020628006Jim IrbyPlasma into rampdown 1.809 s

CII .004

H/D 20% at 1.5 s

Jun 28 2002 12:01:40:267PM1020628007Jim IrbyFizzle
Jun 28 2002 12:16:27:443PM1020628008Jim IrbyDud ---- will ECDC and blame rf conditioning of j-port

Jun 28 2002 12:58:08:430PM1020628009Jim IrbyPlasma for 1.75 s

Carbon II .004

H/D 16% at 1.5 s : about the same as the double null case (ECDC before this shot however)

Gas used was very similar to double null case
Jun 28 2002 12:58:45:917PM1020628010Jim IrbyPlasma

H/D 20% at 1.5
Jun 28 2002 12:59:30:433PM1020628011Jim Irby40 kA fizzle


Jun 28 2002 01:23:27:310PM1020628012Jim IrbyPlasma

Carbon II 0.003

H/D 20-21% at 1.5 s
Jun 28 2002 01:33:32:577PM1020628013Jim IrbyPlasma (even with j-port conditioning)

carbon II 0.004

H/D 22% at 1.5 s
Jun 28 2002 02:22:19:307PM1020628015Jim IrbyDud
Jun 28 2002 02:58:53:863PM1020628016Jim IrbyECDC before shot

Plasma

Carbon .004

H/D 18% with ECDC
Jun 28 2002 03:37:16:440PM1020628017Jim IrbyRF (3 and 4) will come on at 1.25 s

Camac problem --- had to reset
Jun 28 2002 04:04:03:650PM1020628019Jim IrbyPlasma

H/D 17% w/o ECDC

A little RF from 3 and 4
Jun 28 2002 04:24:58:357PM1020628020Jim IrbyPlasma

Brian puffs some ninja gas in BC and probably raises the density

A little more rf

probes running

H/D at 18%

Jun 28 2002 04:36:24:340PM1020628021Jim IrbyPlasma

H/D 19% at 1.5 s

Jun 28 2002 04:49:34:143PM1020628022Jim IrbyPlasma

H/D 20% at 1.5 s --- going up...
Jun 28 2002 05:42:56:787PM1020628023Jim IrbyPlasma

H/D 20%

Physics Operator Comments
Jun 28 2002 07:50:20:443AMJim IrbyDid cold start:

rtnode -- data loaded, A matrix responds
rtnode -- data loaded, M matrix responds
rtnode -- data loaded, PID matrix responds
RT_NODE Done
28-JUN-2002 07:49:06.79

All okay

Jun 28 2002 08:26:54:703AMRobert Granetz
Engineering setup for Friday 28 June 2002

Session leader: J. Irby
Physics operator: R. Granetz

ECDC overnight in D2 at 2e-4 Torr, stopping by 8:00 am.
Set up for possible ECDC in D2 between shots.

Run begins at 09:00 and ends at 17:00.

Power systems the same as for shot 1020626027

Note: We'll have to start with an EF3 test, due to the blown fuse on Thursday.

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)
leave J-Bottom as is Hybrid DISABLED (PG5)

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

-------------------------------------------------------------------------------
RF Setup: Xmtr #3 and 4 in Run On by 06:30

-------------------------------------------------------------------------------
Run Plan:

Note: We'll have to start with an EF3 test, due to the blown fuse on Thursday.

Compare H/D ratio in high-triangularity, nearly double-null plasmas with
H/D ratio in standard triangularity, lower single-null plasmas.

Start from 1020626027 (high-triangularity, nearly double-null)
We may want ECDC in D2 between shots.

We'll switch to segment 2 of shot 1020620008 for the standard shaped plasma,
with the caveat that the density programming will have to be matched to
the highly shaped shot.

RF may do conditioning of J-port into vacuum between shots.
Jun 28 2002 08:37:23:780AMRobert Granetz Overnight ECDC in D2 was done.

Hybrid coldstart done by Jim Irby earlier this morning; no errors found
at that time. But I just tried it and I got an error about an
unreachable node. Steve Wolfe is checking into it.

Loaded PCS from shot 1020626027, but changed density demand to drop
negative after t=1.0 s (per request of Jim Irby).
Jun 28 2002 09:19:16:627AMRobert GranetzThe DNB HV charging supply (CHAPS) won't turn on. No beam for now.
Jun 28 2002 09:18:07:797AM1020628001Robert GranetzShot 01 -- Test. EF3 under PLC control to check fuse repair. 1.7 kA, OK

Next shot: go for plasma.
Jun 28 2002 09:36:34:183AM1020628002Robert GranetzShot 02 -- Fizzle. Fields and gas look fine.

Next shot: no changes.
Jun 28 2002 09:46:35:637AM1020628002Robert GranetzThere is a delay now to investigate an alternator fault condition.
Jun 28 2002 10:39:38:953AM1020628003Robert GranetzShot 03 -- Plasma. Disrupted late in rampdown. nl_04 = 1.0 - 1.2 e20 m-2.
Double-null, delta_L=delta_U=0.8. Ip=0.76 MA, Btor=5.3 T.
H/D=0.15 at t=1.5 s.

Next shot: repeat, no changes
Jun 28 2002 10:39:16:170AM1020628004Robert GranetzShot 04 -- Fizzle. Fields and gas look fine.

Next shot: repeat, no changes. RF tree will be included.
Jun 28 2002 10:52:17:440AM1020628005Robert GranetzShot 05 -- Fizzle. Bz is a little high.

Next shot: Add -10 amps to IC_EF4.
Jun 28 2002 11:07:27:213AM1020628005Robert GranetzThere is a delay now for Jim Irby to work on the TCI laser.
Jun 28 2002 11:31:53:877AM1020628006Robert GranetzShot 06 -- Plasma. Good shot. Double-null, delta_L=delta_U=0.8.
H/D=0.20 at t=1.5 s.

Next shot: switch to standard single-null plasma shape, pulse the
RF between shots, and reduce pre-fill gas puff by 1 ms.
Load segment 2 with seg 2 from 1020620008, and then load wire 14
(nl_04) from the last shot (1020628006).
Jun 28 2002 11:33:17:050AM1020628006Robert GranetzRF has started firing pulses between shots.
Jun 28 2002 11:47:46:213AM1020628007Robert GranetzShot 07 -- Fizzle. Gas was still a little high.

Next shot: reduce pre-fill another 2 ms.
Jun 28 2002 11:47:53:167AM1020628007Robert GranetzDexter and Bill are replacing one of the DNB supply components, using a spare
provided by the BINP team.
Jun 28 2002 12:02:40:067PM1020628008Robert GranetzShot 08 -- Dud. There was gas, so perhaps it was due to the RF firing
between shots.

Next shot: no changes, after 10 minutes of ECDC
Jun 28 2002 12:02:47:613PM1020628008Robert GranetzStart between-shot ECDC in D2.
Jun 28 2002 12:32:16:737PM1020628009Robert GranetzShot 09 -- Plasma. Standard lower-single null shape (kappa=1.65, delta_L=0.5).
nl_04=1.0e20 m-2. H/D=0.16 at t=1.5 s. Jim Irby reports that
it took a similar amount of gas to fuel this discharge compared to
the double-null, high-triangularity discharges earlier today.
There was a failure of some magnetics DAQ after t=1.3 s.

Next shot: no changes, no between-shot ECDC, no between-shot RF.
Jun 28 2002 12:55:33:833PM1020628010Robert GranetzShot 10 -- Plasma. Nearly identical to last shot. H/D=0.20 at t=1.5 s.

Next shot: no changes, no between-shot ECDC, no between-shot RF.
Jun 28 2002 01:01:08:763PM1020628011Robert GranetzShot 11 -- Fizzle. Br0 was a bit high, but it seems to be bouncing around
a little on its own.

Next shot: reduce Br0 offset by 0.5 mT. No between-shot ECDC,
not between-shot RF.
Jun 28 2002 01:22:36:077PM1020628012Robert GranetzShot 12 -- Plasma. SNL, 0.76 MA, 5.3 T, 1.0e20 m-2. H/D=0.20 at t=1.5 s.
Br0 is a bit low, but I'll leave it alone.

Next shot: no changes.
Jun 28 2002 01:22:43:950PM1020628012Robert GranetzResume firing RF pulses between shots.
Jun 28 2002 01:27:12:083PM1020628013Robert GranetzRF is firing between shots.
Jun 28 2002 01:33:04:153PM1020628013Robert GranetzShot 13 -- Plasma. SNL, 0.76 MA, 5.3 T, 1.0e20 m-2. H/D=0.22 at t=1.5 s.

Next shot: no changes, still no between-shot ECDC.
Jun 28 2002 01:50:19:400PM1020628014Robert GranetzShot 14 -- Aborted. IOC faults from 3 of the TF cabinets.
Jun 28 2002 01:50:25:523PM1020628014Robert GranetzRF is firing between shots.
Jun 28 2002 02:22:16:293PM1020628015Robert GranetzShot 15 -- Dud. RF?

Next shot: no changes.
Jun 28 2002 02:22:26:027PM1020628015Robert GranetzRF is firing between shots.
Between-shot ECDC is going after the RF finishes.
Jun 28 2002 03:04:44:980PM1020628016Robert GranetzShot 16 -- Plasma. SNL, 0.76 MA, 5.3 T, 1.0e20 m-2. H/D=0.17 at t=1.5 s.
There was a failure of some magnetics DAQ after t=1.3 s.

Next shot: Brian will be firing both the A and F scanning probes
at t=0.8, 1.0, and 1.2 s. The RF will fire both J-port
transmitters at t=1.25 s.
Jun 28 2002 03:04:51:700PM1020628016Robert GranetzRF is firing between shots.
Between-shot ECDC is going after the RF finishes.
Jun 28 2002 03:16:45:030PM1020628017Robert GranetzShot 17 -- Aborted. There was a fault from the alternator.

Next shot: try again. RF (J-port), scanning probes (A and F), and
flappers too.
Jun 28 2002 03:38:56:800PM1020628018Robert GranetzShot 18 -- Aborted. Nothing fired. MDS problems.
Jun 28 2002 04:02:17:727PM1020628019Robert GranetzShot 19 -- Plasma. SNL, 0.76 MA, 5.3 T, 1.0e20 m-2. H/D=0.17 at t=1.5 s.
The A and F probes fired with no problems. Prf=20 kW net for
about 20 ms.

Next shot: no PCS changes. Scanning probes, flappers, and
RF will fire again. Some NINJA puffing too.
Jun 28 2002 04:13:48:883PM1020628020Robert GranetzShot 20 -- Plasma. SNL, 0.76 MA, 5.3 T, 1.0e20 m-2. H/D=0.18 at t=1.5 s.
We had probe scans, flappers, NINJA puffs, and RF. Prf=45 kW for
20 ms. Density is starting to creep up after 1 s.

Next shot: no PCS changes. Scanning probes, flappers, and
RF will fire again. Some NINJA puffing too.
Jun 28 2002 05:09:38:050PM1020628021Robert GranetzShot 21 -- Plasma. Same-o, same-o. Pleasently boring. H/D=0.19 at t=1.5 s.
Prf=38 kW for 30 ms.

Next shot: repeat everything again
Jun 28 2002 05:08:59:390PM1020628022Robert GranetzShot 22 -- Plasma. We're on a roll. Prf=58 kW for 10 ms. H/D=0.20 at t=1.5 s.

Next shot: repeat everything again.
Jun 28 2002 05:08:20:470PM1020628023Robert GranetzShot 23 -- Plasma. Another good one. H/D=0.20 at t=1.5 s. Prf=30 kW for
40 ms.

Engineering Operator Comments
ShotTimeTypeStatusComment
109:12:30:133AMTestOkEF3 Power Supply Test
209:25:36:683AMPlasmaOk
310:08:57:843AMPlasmaOk
410:28:49:890AMPlasmaOk
510:44:36:383AMPlasmaOk
611:18:06:777AMPlasmaOk
711:34:16:913AMTestOk
811:56:54:697AMPlasmaOk
912:15:30:380PMPlasmaOk
1012:38:16:917PMPlasmaOk
1112:53:49:487PMPlasmaOk
1201:08:58:247PMPlasmaOk
1301:23:09:780PMPlasmaOk
1401:41:26:323PMPlasmaBadTF Breaker pulled prior to puse.
1502:14:12:187PMPlasmaOk
1602:40:17:990PMPlasmaOk
1703:07:43:673PMPlasmaBadAlternator Inhibiter Fault
1903:39:08:893PMPlasmaOk
2003:56:42:063PMPlasmaOk
2104:15:35:387PMPlasmaOk
2204:34:33:323PMPlasmaOk
2304:51:21:473PMPlasmaOk