Alcator C-Mod Run 970528 Information

Miniproposals

Miniproposal: 171a

Date Filed: 5/21/1997

Title: 40MHz RF Conditioning and Testing

First Author: Yuichi Takase

Session Leader: Yuichi Takase (shots 1-47)

Operators
Session leader(s):	Yuichi Takase
Physics operator(s):	Robert Granetz
Engineering operator(s):	Frank Silva,Vinny Bertolino

Engineering Operator Run Comment
yGranetz/Silva, Bertolino

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:16:523PM

Author: To Be Determined

970528
SL: TAKASE
PO: GRANETZ
EO: SILVA

MP171A 40MHz Testing & Conditioning
Reproducible shots for RF testing and conditioning.
He3 not ready as of the beginning of run.
May do 2.6T.

RF testing started around 2:00 pm yesterday (970527).
Net RF power to the plasma was 0.3 MW on shot 970527054
from transmitter #3. Transmitter #4 is out of service
at the moment due to problems with the HV power supply.

This was a successful run as far as RF conditioning is
concerened. Up to 1MW of RF power was injected into
the plasma, helped by the high loading resistance.
The toroidal field was ramped from 5.4T to 2.8T.
Loading changed substantially when the H cyclotron
layer was just in front of the antenna. The H
concentration was still very high (around 20%),
and the radiated power was very high (approximately
100% of the injected RF power is radiated).
Very little heating was observed, but good H-mode was
observed at 2.6T on Shot 3 with a little less than 0.4MW of
RF power. This is believed to be because the H concentration
was still low. In spite of the good progress made today,
we still have many more things to check out before
the 40MHz system is ready for physics experiments.

Shot
001 PSf Power supply fault
002 pla 4.1T 0.8MA nel=0.8 Prf=0.3
003 pla rampdown to 4.1T then to 2.6T, 0.8MA nel=0.8 Prf=0.4
small H-mode @ 4T, big H-mode @ 2.6T, Prf=0.35MW
disrupted at q=2.6 (current didn't get reduced)
straight ramp down for next shot (no stop at 4T)
004 fiz
005 fiz
006 dud
007 pla arced at H-mode, no H-mode @ 2.6T
008 pla no H-mode, plasma outer gap growing in time
need to work on establishing tuning parameters
009 fiz
010 pla
011 pla disr @ 1.1s, RF trip @ 0.83s is probably caused by
H resonance in front of antenna
change RF timing for next shot
012 pla disr @ 0.72s
013 pla RF trip @ 0.72s (3.7T)
014 fiz
015 pla changed RF timing, RF trip @ 0.98s (2.95T)
016 fiz
017 pla good RF pulses (0.4MW)
018 fiz
019 fiz
020 fiz
021 fiz
022 fiz
023 pla
024 pla 0.5MW (working on RF diagnostics)
025 pla
026 pla disr @ 1.08s, 0.55MW
027 pla
028 pla 0.6MW
029 pla
030 pla 0.7MW
031 pla 0.75MW
032 pla 0.8MW
033 pla 0.8MW
034 pla 0.9MW
035 pla 1.0MW
036 pla disr @ 0.65s
037 fiz
038 pla 1.0MW H-mode
039 fiz
040 fiz
041 pla 1.0MW
042 pla 1.1MW transmitter screen overload
043 pla 1.0MW transmitter screen overload
044 pla 1.0MW
045 pla 1.0MW, higher density nel=1.0
046 pla 1.0MW transmitter screen overload
047 fiz

Physics Operator Summaries

Entered: Jul 7 2004 04:36:57:350PM

Author: To Be Determined

Physics operator summary for run 970528

MP 171A, 40 MHz RF conditioning and testing

SL: Takase
PO: Granetz
EO: Bertolino, Silva

Summary: Good progress was made on bringing up the available RF power. Most of
the discharges had Btor ramping down to 2.8 T by t=1.0 s, with two
RF pulses: one around Btor=4 T and the other at Btor=2.8 T. Plasma
current was also ramped down from 0.8 to 0.6 MA in order to keep q95
just above 3.0. Power levels up to 1 MW were launched, and a few
H-modes were seen. Shot 003 had a very good H-mode at 2.8 T. The
machine ran very well, except that disruption recovery was somewhat of
a problem. The nitrogen leak is also getting worse. Plasmas were
achieved on 2/3 of the attempts.

Note: He3 was not available for this run. It should be available by
tomorrow.

Scorecard: 31 plasmas
14 fizzles
2 duds (1 due to power supply problems)
0 tests
----------
47 total

------------------------------------------------------------------------------
Run Plan for Wednesday, 970528:

We will pick up where we left off on Tuesday. The machine is running
pretty well and the 40 MHz RF is beginning to operate. The main thrust of
today's run will be to continue debugging and conditioning the RF at 4
tesla. We will probably want to introduce He3 at some time during the run.

Engineering setup for Wednesday 28 May 1997

Discharge clean in deuterium overnight.
Engineering setup as on 970527054, with TF under hybrid control

Gas setup - hybrid enable all valves
fill K-side with 20 PSI of D2
fill B-top with 5 PSI of D2
fill B-side-lower with 4 PSI of Ar
*******************************************************************************

** NOTE: ** Have the He3 bottle hooked up to PG valve #2 (B-side_upper ??),
and have the system ready to go for the run if at all possible,
BUT DO NOT FILL THE PLENUM YET.

*******************************************************************************
The following gate valves should be enabled, assuming no vacuum problems
with the corresponding diagnostics (ECE, TCI, PCX & TCX, VUV)

-------------------------------------------------------------------------------
Detailed shot log:

Hybrid coldstart done; no problems.
Reload last shot of yesterday (970527054), but ramp CLEARIN down
faster after t=1.3 s.

Shot 01 -- No OH1, EF1's, TF. Note: we had to back out of a shot cycle prior
running this shot, and that caused some of the PLC's to timeout.
The same problem happened yesterday. Apparently we have to go
through a full shot cycle to reset everything properly.

Shot 02 -- Plasma. Good shot. Ip=0.8 MA, nl=0.9-1.0e20 m-2. Prf=0.3+ MW.
Looks like there was an H-mode during the RF.

Next shot: ramp CLEARIN down even faster after t=1.3 s. Program in
an additional Btor ramp down to 2.6 T starting at t=0.8 s.

Shot 03 -- Plasma. Btor rampdown to 2.6 T didn't quite flattop. Disrupted at
t=1.21 s when q95 gets down to 2.6 (operator error!). Lower halo
current of 200 kA. Two H-modes at the two different times.

Next shot: get rid of 4.0 T flattop...rampdown to 2.6 T for most of
the shot. Reduce Ip to 0.6 MA for most of the shot.

Shot 04 -- Fizzle. 60 kA.

Next shot: try again, no changes.

Shot 05 -- Fizzle. Very dim.

Next shot: Change Ip programming so that it's 0.8 MA until t=0.6 s,
and then rampdown to 0.6 MA by t=0.75 s.

Shot 06 -- Dud. Null looks crummy.

Next shot: reduce Br offset from .0065 to .006

Shot 07 -- Plasma. Good shot. Ip=0.8 MA until 0.6 s, then rampdown to 0.6 MA
by t=0.75 s. Btor makes it down to 2.8 T at 1.0 s, then flattops.
q95=3.1. Right gap ramps from 1 cm to 2 cm during the shot. No
H-mode during the low-field RF pulse.

Next shot: enable argon puff and move argon pulse earlier by 0.1 s.
Also, ramp RCUR in by 5 mm during the shot to try and keep the outer
gap constant.

Shot 08 -- Plasma. Disrupted at 1.16 s. Argon? It came on strong but seems
to pump out by 0.8 s. I had the wrong direction on the change to
RCUR.

Next shot: ramp RCUR outwards by 5 mm instead of inwards!

There's a break in the action while Josh does something to one of the camac
highways. It's taking longer than he told me it would.

Shot 09 -- Fizzle. 60 kA. Null okay.

Next shot: try again, no changes.

Shot 10 -- Plasma. Good shot. Outboard gap stays pretty constant at 1.2 cm.

Next shot: add another argon puff at t=1.0 s. Ramp CLEARIN down
faster still at end of shot.

Shot 11 -- Plasma. Disrupted at t=1.10 s. Second argon puff?

Next shot: reduce 2nd argon puff from 27 to 20 ms.

Shot 12 -- Plasma. Disrupted at t=0.71 s (during rampdown from 0.8 to 0.6 MA).
No sign of any moly injection. No sign of any vertical instability.

Next shot: no changes.

Shot 13 -- Plasma. Disrupted at 1.34 s. Lots of magnetics camac errors, but
Josh was able to recover the data. EFIT will have to be rerun.

Next shot: no PCS changes, only RF timing changes.

Shot 14 -- Fizzle. 50 kA. Null is not great.

Next shot: try again, no changes.

Shot 15 -- Plasma. Disrupted at 1.19 s. I don't think it's the argon.

Next shot: no PCS changes. Brian's new B-FSP (Belching Fast
Scanning Probe) will operate with helium on the next shot at
t=0.7 s.

Shot 16 -- Fizzle. 50 kA.

Next shot: no changes

Shot 17 -- Plasma. Disrupted at 1.34 s. Still no H-modes.

Next shot: no changes.

Shot 18 -- Fizzle. 50 kA. Null is fair.

Next shot: no changes.

Shot 19 -- Fizzle. 50 kA.

Next shot: no changes.

Shot 20 -- Fizzle. 50 kA. Time to make a change to the null. There is a
little too much Bz.

Next shot: add -15 amps to EF4 in segment 1.

Shot 21 -- Fizzle. 45 kA.

Next shot: try changing Br offset from .006 to .0065 (no good reason
for doing this though).

Shot 22 -- Fizzle. Very weak. Br got worse.

Next shot: change Br offset from .0065 to .0055. If that doesn't
do it, I'll reload an old shot.

Shot 23 -- Plasma. Disrupted at 1.32 s. Prf=0.4 MW. No H-modes.

Next shot: no PCS changes.

Shot 24 -- Plasma. Disrupted at 1.25 s. No H-modes. Brian reports a very
bright helium plume from the B-FSP.

Next shot: tweak CLEARIN around t=1.25 s.

Shot 25 -- Plasma. Disrupted at 1.30 s. Plasma is still not limited at the
end of the shot.

Next shot: rampdown CLEARIN even faster.

Shot 26 -- Plasma. Disrupted at 1.08 s, at the start of the 2nd RF pulse.
The TCI gate valve has closed prematurely during the last two
shots.

Next shot: turn off the argon valve permissive.

Shot 27 -- Plasma. Great shot, ramped nearly all the way down. Magnetics
camac errors, but I recovered the data. TCI is having bad problems
with its gate valve. This shot was limited after 1.30 s. Argon??

Next shot: keep the argon off.

Shot 28 -- Plasma. Another great shot, ramped nearly all the way down again.
TCI didn't have a problem this time.

Next shot: re-enable the argon, but get rid of the second puff, and
reduce the first puff from 27 to 20 ms.

Shot 29 -- Plasma. Good shot, but didn't last quite as long as the no-argon
shots. Still no H-modes.

Next shot: no changes.

Shot 30 -- Plasma. Good shot.

Next shot: reduce argon pulse from 20 to 18 ms.

Shot 31 -- Plasma. Good shot.

Next shot: no PCS changes.

Shot 32 -- Plasma. Good shot.

Next shot: no PCS changes

Shot 33 -- Plasma. It's becoming pleasantly boring! I probably just jinxed
it. The first RF pulse is reaching 0.8 MW. Second RF pulse is also
ramping up.

Next shot: no PCS changes.

Shot 34 -- Plasma. Good shot.

Next shot: no PCS changes

Shot 35 -- Plasma. Good shot.

Next shot: no PCS changes

Shot 36 -- Plasma, but hard disruption at 0.65 s. Prad_2pi started increasing
at 0.637 s.

Next shot: turn off argon valve permissive

Shot 37 -- Fizzle. 50 kA. Null looks okay.

Next shot: try again, no changes.

Shot 38 -- Plasma. Great shot, ramped almost all the way down (no argon).
There was an H-mode on the first RF pulse, and a lot of dithering
during the second RF pulse.

Next shot: no PCS changes. Argon still disabled.

Shot 39 -- Fizzle. 50 kA. Nice looking null.

Next shot: no PCS changes. Re-enable argon valve.

Shot 40 -- Fizzle. 50 kA.

Next shot: try again, no changes.

Shot 41 -- Plasma. Good shot. Disrupted at 1.36 s. Base pressure is
remaining high between shots (>3e-6 torr).

We are going to have a break in the action to allow a number of people cell
access and lab access. But I hope to close up in time to try for a few more
plasmas.

Next shot: no PCS changes.

Shot 42 -- Plasma. Good shot. Disrupted at 1.38 s. Only one RF pulse.

Next shot: no PCS changes.

Shot 43 -- Plasma. Good shot. Disrupted at 1.40 s. Only one RF pulse again.

Next shot: no PCS changes.

Shot 44 -- Plasma. Good shot. Disrupted at 1.40 s. Got both RF pulses, but
no H-mode at the low field.

Next shot: increase density demand from nl=0.9e20 to 1.1e20 m-2

Shot 45 -- Plasma. Good shot. Got slightly higher density. Disrupted at
1.35 s. No magnetics traq_1 data. Prf=1 MW on the first pulse,
lower on the second pulse.

Next shot: increase density demand from nl=1.1 to 1.2e20 m-2.

Shot 46 -- Plasma. Good shot. Disrupted at 1.30 s. Got the requested
density. Only one RF pulse. Base pressure was very high just
prior to this shot (3.7e-6 torr).

Next shot: no PCS changes.

Shot 47 -- Fizzle. Base pressure was 4.6e-6 just prior to this shot because
we were rushing to squeeze in another shot. Nitrogen peak is
very high. The leak is getting worse.

End of run.

Session Leader Comments

May 28 1997 08:54:17:870AM Yuichi Takase MP171A 40MHz Testing & Conditioning
Reproducible shots for RF testing and conditioning.
He3 not ready as of the beginning of run.
May do 2.6T.

May 28 1997 09:03:34:680AM 970528001 Yuichi Takase Power supply fault.

May 28 1997 09:24:33:750AM 970528002 Yuichi Takase Plasma
4.1T (rampdown from 5.3T) 0.8MA nel=0.8 Prf=0.3
small H-mode

May 28 1997 09:36:05:730AM 970528003 Yuichi Takase Plasma
rampdown to 4.1T then to 2.6T
0.8MA nel=0.8 Prf=0.4
small H-mode @ 4T, big H-mode @ 2.6T
disrupted at q=2.6 (current didn't get reduced)
straight ramp down for next shot (no stop at 4T)

May 28 1997 09:57:29:080AM 970528004 Yuichi Takase Fizzle

May 28 1997 09:57:38:780AM 970528005 Yuichi Takase Fizzle (weak)

May 28 1997 09:57:47:420AM 970528006 Yuichi Takase Dud

May 28 1997 10:15:28:780AM 970528007 Yuichi Takase Plasma
2.8T 0.6MA
arced at H-mode, no H-mode @ 2.6T

May 28 1997 10:46:55:630AM 970528008 Yuichi Takase Plasma
2.8T 0.6MA
no H-mode, plasma outer gap growing in time
need to work on establishing tuning parameters

May 28 1997 11:10:19:480AM 970528009 Yuichi Takase Fizzle

May 28 1997 11:20:35:530AM 970528010 Yuichi Takase Plasma
Good shot with constant Rgap=1.3cm
no H-mode, inj @ 1.14s

May 28 1997 11:21:34:590AM 970528011 Yuichi Takase Plasma
dispr @ 1.1s
RF trip @ 0.83s is probably caused by H resonance in front of antenna
change RF timing for next shot

May 28 1997 11:22:27:020AM 970528012 Yuichi Takase Plasma
dispr @ 0.7s

May 28 1997 12:29:34:220PM 970528013 Yuichi Takase Plasma
RF trip @ 0.72s (3.7T)

May 28 1997 12:29:46:510PM 970528014 Yuichi Takase Fizzle

May 28 1997 12:30:08:950PM 970528015 Yuichi Takase Plasma
changed RF timing, RF trip @ 0.98s (2.95T)

May 28 1997 12:30:22:460PM 970528016 Yuichi Takase Fizzle

May 28 1997 12:30:42:020PM 970528017 Yuichi Takase Plasma
good RF pulses (0.4MW)

May 28 1997 12:30:54:700PM 970528018 Yuichi Takase Fizzle

May 28 1997 12:31:10:420PM 970528019 Yuichi Takase Fizzle

May 28 1997 12:31:56:090PM 970528020 Yuichi Takase Fizzle

May 28 1997 01:26:04:080PM 970528021 Yuichi Takase Fizzle

May 28 1997 01:26:23:490PM 970528022 Yuichi Takase Fizzle

May 28 1997 01:34:21:330PM 970528023 Yuichi Takase Plasma
0.4MW (working on RF diagnostics)

May 28 1997 01:34:38:860PM 970528024 Yuichi Takase Plasma
0.5MW

May 28 1997 01:34:54:110PM 970528025 Yuichi Takase Plasma
0.5MW

May 28 1997 01:35:11:590PM 970528026 Yuichi Takase Plasma
disr @ 1.08s

May 28 1997 02:24:23:380PM 970528027 Yuichi Takase Plasma
good shot, will start raising power

May 28 1997 02:24:41:530PM 970528028 Yuichi Takase Plasma
0.6MW

May 28 1997 02:25:22:320PM 970528029 Yuichi Takase Plasma
0.6MW

May 28 1997 02:25:37:990PM 970528030 Yuichi Takase Plasma
0.7MW

May 28 1997 02:25:49:490PM 970528031 Yuichi Takase Plasma
0.75MW

May 28 1997 02:31:01:280PM 970528032 Yuichi Takase Plasma
0.8MW

May 28 1997 03:18:08:580PM 970528033 Yuichi Takase Plasma
0.8MW

May 28 1997 03:18:22:880PM 970528034 Yuichi Takase Plasma
0.9MW

May 28 1997 03:18:34:130PM 970528035 Yuichi Takase Plasma
1.0MW

May 28 1997 03:18:55:020PM 970528036 Yuichi Takase Plasma
disr @ 0.65s

May 28 1997 03:19:07:270PM 970528037 Yuichi Takase Fizzle

May 28 1997 05:30:39:750PM 970528038 Yuichi Takase Plasma
1.0MW, H-mode

May 28 1997 05:30:52:740PM 970528039 Yuichi Takase Fizzle

May 28 1997 05:31:05:360PM 970528040 Yuichi Takase Fizzle

May 28 1997 05:31:25:840PM 970528041 Yuichi Takase Plasma
1.0MW

May 28 1997 05:31:49:050PM 970528042 Yuichi Takase Plasma
1.1MW, transmitter screen overload

May 28 1997 05:31:59:700PM 970528043 Yuichi Takase Plasma
1.0MW, transmitter screen overload

May 28 1997 05:32:12:450PM 970528044 Yuichi Takase Plasma
1.0MW

May 28 1997 05:32:27:430PM 970528045 Yuichi Takase Plasma
1.0MW, higher density nel=1.0

May 28 1997 05:32:47:400PM 970528046 Yuichi Takase Plasma
1.0MW transmitter screen overload

May 28 1997 05:33:02:200PM 970528047 Yuichi Takase Fizzle

Physics Operator Comments

May 28 1997 08:26:34:330AM Robert Granetz Hybrid coldstart done; no problems

May 28 1997 08:59:16:500AM Robert Granetz Reload last shot of yesterday (970527054), but ramp CLEARIN down
faster after t=1.3 s.

May 28 1997 08:59:35:440AM 970528001 Robert Granetz Shot 01 -- No OH1, EF1's, TF. Note: we had to back out of a shot cycle prior
running this shot, and that caused some of the PLC's to timeout.
The same problem happened yesterday. Apparently we have to go
through a full shot cycle to reset everything properly.

May 28 1997 09:13:20:470AM 970528002 Robert Granetz Shot 02 -- Plasma. Good shot. Ip=0.8 MA, nl=0.9-1.0e20 m-2. Prf=0.3+ MW.
Looks like there was an H-mode during the RF.

Next shot: ramp CLEARIN down even faster after t=1.3 s. Program in
an additional Btor ramp down to 2.6 T starting at t=0.8 s.

May 28 1997 09:26:41:640AM 970528003 Robert Granetz Shot 03 -- Plasma. Btor rampdown to 2.6 T didn't quite flattop. Disrupted at
t=1.21 s when q95 gets down to 2.6. Lower halo current of 200 kA.
Two H-modes at the two different times.

Next shot: get rid of 4.0 T flattop...rampdown to 2.6 T for most of
the shot. Reduce Ip to 0.6 MA for most of the shot.

May 28 1997 09:37:21:350AM 970528004 Robert Granetz
Shot 04 -- Fizzle. 60 kA.

Next shot: try again, no changes.

May 28 1997 09:46:49:660AM 970528005 Robert Granetz
Shot 05 -- Fizzle. Very dim.

Next shot: Change Ip programming so that it's 0.8 MA until t=0.6 s,
and then rampdown to 0.6 MA by t=0.75 s.

May 28 1997 09:54:00:780AM 970528006 Robert Granetz
Shot 06 -- Dud. Null looks crummy.

Next shot: reduce Br offset from .0065 to .006

May 28 1997 10:11:50:390AM 970528007 Robert Granetz Shot 07 -- Plasma. Good shot. Ip=0.8 MA until 0.6 s, then rampdown to 0.6 MA
by t=0.75 s. Btor makes it down to 2.8 T at 1.0 s, then flattops.
q95=3.1. Right gap ramps from 1 cm to 2 cm during the shot. No
H-mode during the low-field RF pulse.

Next shot: enable argon puff and move argon pulse earlier by 0.1 s.
Also, ramp RCUR in by 5 mm during the shot to try and keep the outer
gap constant.

May 28 1997 10:22:54:030AM 970528008 Robert Granetz
Shot 08 -- Plasma. Disrupted at 1.16 s. Argon? It came on strong but seems
to pump out by 0.8 s. I had the wrong direction on the change to
RCUR.

Next shot: ramp RCUR outwards by 5 mm instead of inwards!

May 28 1997 10:41:16:190AM 970528008 Robert Granetz
There's a break in the action while Josh does something to one of the camac
highways. It's taking longer than he told me it would.

May 28 1997 10:51:17:510AM 970528009 Robert Granetz
Shot 09 -- Fizzle. 60 kA. Null okay.

Next shot: try again, no changes.

May 28 1997 11:02:39:890AM 970528010 Robert Granetz
Shot 10 -- Plasma. Good shot. Outboard gap stays pretty constant at 1.2 cm.

Next shot: add another argon puff at t=1.0 s. Ramp CLEARIN down
faster still at end of shot.

May 28 1997 11:08:26:010AM 970528011 Robert Granetz
Shot 11 -- Plasma. Disrupted at t=1.10 s. Second argon puff?

Next shot: reduce 2nd argon puff from 27 to 20 ms.

May 28 1997 11:18:31:910AM 970528012 Robert Granetz
Shot 12 -- Plasma. Disrupted at t=0.71 s (during rampdown from 0.8 to 0.6 MA).
No sign of any moly injection. No sign of any vertical instability.

Next shot: no changes.

May 28 1997 11:30:19:690AM 970528013 Robert Granetz
Shot 13 -- Plasma. Disrupted at 1.34 s. Lots of magnetics camac errors, but
Josh was able to recover the data. EFIT will have to be rerun.

Next shot: no PCS changes, only RF timing changes.

May 28 1997 11:37:02:670AM 970528014 Robert Granetz
Shot 14 -- Fizzle. 50 kA. Null is not great.

Next shot: try again, no changes.

May 28 1997 11:49:13:980AM 970528015 Robert Granetz Shot 15 -- Plasma. Disrupted at 1.19 s. I don't think it's the argon.

Next shot: no PCS changes. Brian's new B-FSP (Belching Fast
Scanning Probe) will operate with helium on the next shot at
t=0.7 s.

May 28 1997 12:00:30:110PM 970528016 Robert Granetz
Shot 16 -- Fizzle. 50 kA.

Next shot: no changes

May 28 1997 12:05:47:990PM 970528017 Robert Granetz
Shot 17 -- Plasma. Disrupted at 1.34 s. Still no H-modes.

Next shot: no changes.

May 28 1997 12:14:28:380PM 970528018 Robert Granetz
Shot 18 -- Fizzle. 50 kA. Null is fair.

Next shot: no changes.

May 28 1997 12:24:38:690PM 970528019 Robert Granetz
Shot 19 -- Fizzle. 50 kA.

Next shot: no changes.

May 28 1997 12:31:31:470PM 970528020 Robert Granetz
Shot 20 -- Fizzle. 50 kA. Time to make a change to the null. There is a
little too much Bz.

Next shot: add -15 amps to EF4 in segment 1.

May 28 1997 12:40:41:550PM 970528021 Robert Granetz
Shot 21 -- Fizzle. 45 kA.

Next shot: try changing Br offset from .006 to .0065 (no good reason
for doing this though).

May 28 1997 12:46:03:000PM 970528022 Robert Granetz
Shot 22 -- Fizzle. Very weak. Br got worse.

Next shot: change Br offset from .0065 to .0055. If that doesn't
do it, I'll reload an old shot.

May 28 1997 01:00:38:020PM 970528023 Robert Granetz
Shot 23 -- Plasma. Disrupted at 1.32 s. Prf=0.4 MW. No H-modes.

Next shot: no PCS changes.

May 28 1997 01:12:30:100PM 970528024 Robert Granetz
Shot 24 -- Plasma. Disrupted at 1.25 s. No H-modes. Brian reports a very
bright helium plume from the B-FSP.

Next shot: tweak CLEARIN around t=1.25 s.

May 28 1997 01:24:53:010PM 970528025 Robert Granetz
Shot 25 -- Plasma. Disrupted at 1.30 s. Plasma is still not limited at the
end of the shot.

Next shot: rampdown CLEARIN even faster.

May 28 1997 01:38:00:720PM 970528026 Robert Granetz
Shot 26 -- Plasma. Disrupted at 1.08 s, at the start of the 2nd RF pulse.
The TCI gate valve has closed prematurely during the last two
shots.

Next shot: turn off the argon valve permissive.

May 28 1997 01:50:26:650PM 970528027 Robert Granetz
Shot 27 -- Plasma. Great shot, ramped nearly all the way down. Magnetics
camac errors, but I recovered the data. TCI is having bad problems
with its gate valve. This shot was limited after 1.30 s. Argon??

Next shot: keep the argon off.

May 28 1997 01:57:09:660PM 970528028 Robert Granetz
Shot 28 -- Plasma. Another great shot, ramped nearly all the way down again.
TCI didn't have a problem this time.

Next shot: re-enable the argon, but get rid of the second puff, and
reduce the first puff from 27 to 20 ms.

May 28 1997 02:06:21:030PM 970528029 Robert Granetz
Shot 29 -- Plasma. Good shot, but didn't last quite as long as the no-argon
shots. Still no H-modes.

Next shot: no changes.

May 28 1997 02:14:25:080PM 970528030 Robert Granetz
Shot 30 -- Plasma. Good shot.

Next shot: reduce argon pulse from 20 to 18 ms.

May 28 1997 02:21:46:610PM 970528031 Robert Granetz
Shot 31 -- Plasma. Good shot.

Next shot: no PCS changes.

May 28 1997 02:29:52:650PM 970528032 Robert Granetz
Shot 32 -- Plasma. Good shot.

Next shot: no PCS changes

May 28 1997 02:39:20:670PM 970528033 Robert Granetz
Shot 33 -- Plasma. It's becoming pleasantly boring! I probably just jinxed
it. The first RF pulse is reaching 0.8 MW. Second RF pulse is also
ramping up.

Next shot: no PCS changes.

May 28 1997 02:49:19:440PM 970528034 Robert Granetz
Shot 34 -- Plasma. Good shot.

Next shot: no PCS changes

May 28 1997 02:57:05:220PM 970528035 Robert Granetz
Shot 35 -- Plasma. Good shot.

Next shot: no PCS changes

May 28 1997 03:08:37:000PM 970528036 Robert Granetz
Shot 36 -- Plasma, but hard disruption at 0.65 s. Prad_2pi started increasing
at 0.637 s.

Next shot: turn off argon valve permissive

May 28 1997 03:15:44:360PM 970528037 Robert Granetz
Shot 37 -- Fizzle. 50 kA. Null looks okay.

Next shot: try again, no changes.

May 28 1997 03:24:35:780PM 970528038 Robert Granetz
Shot 38 -- Plasma. Great shot, ramped almost all the way down (no argon).
There was an H-mode on the first RF pulse, and a lot of dithering
during the second RF pulse.

Next shot: no PCS changes. Argon still disabled.

May 28 1997 03:31:10:960PM 970528039 Robert Granetz
Shot 39 -- Fizzle. 50 kA. Nice looking null.

Next shot: no PCS changes. Re-enable argon valve.

May 28 1997 03:38:33:440PM 970528040 Robert Granetz Shot 40 -- Fizzle. 50 kA.

Next shot: try again, no changes.

May 28 1997 04:09:39:160PM 970528041 Robert Granetz
Shot 41 -- Plasma. Good shot. Disrupted at 1.36 s. Base pressure is
remaining high between shots (>3e-6 torr).

We are going to have a break in the action to allow a number of people cell
access and lab access. But I hope to close up in time to try for a few more
plasmas.

May 28 1997 04:23:46:160PM 970528042 Robert Granetz Shot 42 -- Plasma. Good shot. Disrupted at 1.38 s. Only one RF pulse.

Next shot: no PCS changes.

May 28 1997 04:31:43:550PM 970528043 Robert Granetz
Shot 43 -- Plasma. Good shot. Disrupted at 1.40 s. Only one RF pulse again.

Next shot: no PCS changes.

May 28 1997 04:42:10:300PM 970528044 Robert Granetz Shot 44 -- Plasma. Good shot. Disrupted at 1.40 s. Got both RF pulses, but
no H-mode at the low field.

Next shot: increase density demand from nl=0.9e20 to 1.1e20 m-2

May 28 1997 04:49:40:350PM 970528045 Robert Granetz
Shot 45 -- Plasma. Good shot. Got slightly higher density. Disrupted at
1.35 s. No magnetics traq_1 data. Prf=1 MW on the first pulse,
lower on the second pulse.

Next shot: increase density demand from nl=1.1 to 1.2e20 m-2.

May 28 1997 04:57:55:590PM 970528046 Robert Granetz
Shot 46 -- Plasma. Good shot. Disrupted at 1.30 s. Got the requested
density. Only one RF pulse. Base pressure was very high just
prior to this shot (3.7e-6 torr).

Next shot: no PCS changes.

May 28 1997 05:02:07:390PM 970528047 Robert Granetz
Shot 47 -- Fizzle. Base pressure was 4.6e-6 just prior to this shot because
we were rushing to squeeze in another shot. Nitrogen peak is
very high. The leak is getting worse.

End of run.

Engineering Operator Comments

Shot Time Type Status Comment

1 08:45:05:400AM Plasma Ok all supplies did not fire

2 08:59:20:570AM Plasma Ok plasma shot#2 09:00

3 09:13:59:240AM Plasma Ok

4 09:29:07:020AM Plasma Ok

5 09:38:19:600AM Plasma Ok

6 09:48:07:500AM Plasma Ok

7 09:55:36:260AM Plasma Ok

8 10:13:57:910AM Plasma Ok

9 10:47:32:720AM Plasma Ok

10 10:53:55:790AM Plasma Ok

11 11:03:37:190AM Plasma Ok

12 11:10:54:960AM Plasma Ok

13 11:20:37:160AM Plasma Ok

14 11:31:53:860AM Plasma Ok

15 11:39:33:890AM Plasma Ok

16 11:51:09:130AM Plasma Ok

17 11:59:05:310AM Plasma Ok

18 12:06:27:130PM Plasma Ok

19 12:15:08:450PM Plasma Ok

20 12:24:33:780PM Plasma Ok

21 12:33:21:840PM Plasma Ok

22 12:41:50:870PM Plasma Ok

23 12:48:44:710PM Plasma Ok

24 01:01:31:600PM Plasma Ok

25 01:13:34:000PM Plasma Ok

26 01:26:09:200PM Plasma Ok

27 01:40:00:380PM Plasma Ok

28 01:52:26:830PM Plasma Ok

29 02:00:37:710PM Plasma Ok

30 02:07:59:450PM Plasma Ok

31 02:15:41:510PM Plasma Ok

32 02:24:07:810PM Plasma Ok

33 02:32:47:930PM Plasma Ok

34 02:42:27:280PM Plasma Ok

35 02:50:10:250PM Plasma Ok

36 03:00:32:030PM Plasma Ok

37 03:10:19:250PM Plasma Ok

38 03:18:19:400PM Plasma Ok

39 03:27:32:630PM Plasma Ok

40 03:35:02:780PM Plasma Ok

41 03:52:15:020PM Plasma Ok

42 04:19:43:990PM Plasma Ok

43 04:26:44:010PM Plasma Ok

44 04:33:40:300PM Plasma Ok

45 04:43:35:720PM Plasma Ok

46 04:53:03:090PM Plasma Ok

47 04:59:21:020PM Plasma Ok

Session Leader Comments
May 28 1997 08:54:17:870AM		Yuichi Takase	MP171A 40MHz Testing & Conditioning Reproducible shots for RF testing and conditioning. He3 not ready as of the beginning of run. May do 2.6T.
May 28 1997 09:03:34:680AM	970528001	Yuichi Takase	Power supply fault.
May 28 1997 09:24:33:750AM	970528002	Yuichi Takase	Plasma 4.1T (rampdown from 5.3T) 0.8MA nel=0.8 Prf=0.3 small H-mode
May 28 1997 09:36:05:730AM	970528003	Yuichi Takase	Plasma rampdown to 4.1T then to 2.6T 0.8MA nel=0.8 Prf=0.4 small H-mode @ 4T, big H-mode @ 2.6T disrupted at q=2.6 (current didn't get reduced) straight ramp down for next shot (no stop at 4T)
May 28 1997 09:57:29:080AM	970528004	Yuichi Takase	Fizzle
May 28 1997 09:57:38:780AM	970528005	Yuichi Takase	Fizzle (weak)
May 28 1997 09:57:47:420AM	970528006	Yuichi Takase	Dud
May 28 1997 10:15:28:780AM	970528007	Yuichi Takase	Plasma 2.8T 0.6MA arced at H-mode, no H-mode @ 2.6T
May 28 1997 10:46:55:630AM	970528008	Yuichi Takase	Plasma 2.8T 0.6MA no H-mode, plasma outer gap growing in time need to work on establishing tuning parameters
May 28 1997 11:10:19:480AM	970528009	Yuichi Takase	Fizzle
May 28 1997 11:20:35:530AM	970528010	Yuichi Takase	Plasma Good shot with constant Rgap=1.3cm no H-mode, inj @ 1.14s
May 28 1997 11:21:34:590AM	970528011	Yuichi Takase	Plasma dispr @ 1.1s RF trip @ 0.83s is probably caused by H resonance in front of antenna change RF timing for next shot
May 28 1997 11:22:27:020AM	970528012	Yuichi Takase	Plasma dispr @ 0.7s
May 28 1997 12:29:34:220PM	970528013	Yuichi Takase	Plasma RF trip @ 0.72s (3.7T)
May 28 1997 12:29:46:510PM	970528014	Yuichi Takase	Fizzle
May 28 1997 12:30:08:950PM	970528015	Yuichi Takase	Plasma changed RF timing, RF trip @ 0.98s (2.95T)
May 28 1997 12:30:22:460PM	970528016	Yuichi Takase	Fizzle
May 28 1997 12:30:42:020PM	970528017	Yuichi Takase	Plasma good RF pulses (0.4MW)
May 28 1997 12:30:54:700PM	970528018	Yuichi Takase	Fizzle
May 28 1997 12:31:10:420PM	970528019	Yuichi Takase	Fizzle
May 28 1997 12:31:56:090PM	970528020	Yuichi Takase	Fizzle
May 28 1997 01:26:04:080PM	970528021	Yuichi Takase	Fizzle
May 28 1997 01:26:23:490PM	970528022	Yuichi Takase	Fizzle
May 28 1997 01:34:21:330PM	970528023	Yuichi Takase	Plasma 0.4MW (working on RF diagnostics)
May 28 1997 01:34:38:860PM	970528024	Yuichi Takase	Plasma 0.5MW
May 28 1997 01:34:54:110PM	970528025	Yuichi Takase	Plasma 0.5MW
May 28 1997 01:35:11:590PM	970528026	Yuichi Takase	Plasma disr @ 1.08s
May 28 1997 02:24:23:380PM	970528027	Yuichi Takase	Plasma good shot, will start raising power
May 28 1997 02:24:41:530PM	970528028	Yuichi Takase	Plasma 0.6MW
May 28 1997 02:25:22:320PM	970528029	Yuichi Takase	Plasma 0.6MW
May 28 1997 02:25:37:990PM	970528030	Yuichi Takase	Plasma 0.7MW
May 28 1997 02:25:49:490PM	970528031	Yuichi Takase	Plasma 0.75MW
May 28 1997 02:31:01:280PM	970528032	Yuichi Takase	Plasma 0.8MW
May 28 1997 03:18:08:580PM	970528033	Yuichi Takase	Plasma 0.8MW
May 28 1997 03:18:22:880PM	970528034	Yuichi Takase	Plasma 0.9MW
May 28 1997 03:18:34:130PM	970528035	Yuichi Takase	Plasma 1.0MW
May 28 1997 03:18:55:020PM	970528036	Yuichi Takase	Plasma disr @ 0.65s
May 28 1997 03:19:07:270PM	970528037	Yuichi Takase	Fizzle
May 28 1997 05:30:39:750PM	970528038	Yuichi Takase	Plasma 1.0MW, H-mode
May 28 1997 05:30:52:740PM	970528039	Yuichi Takase	Fizzle
May 28 1997 05:31:05:360PM	970528040	Yuichi Takase	Fizzle
May 28 1997 05:31:25:840PM	970528041	Yuichi Takase	Plasma 1.0MW
May 28 1997 05:31:49:050PM	970528042	Yuichi Takase	Plasma 1.1MW, transmitter screen overload
May 28 1997 05:31:59:700PM	970528043	Yuichi Takase	Plasma 1.0MW, transmitter screen overload
May 28 1997 05:32:12:450PM	970528044	Yuichi Takase	Plasma 1.0MW
May 28 1997 05:32:27:430PM	970528045	Yuichi Takase	Plasma 1.0MW, higher density nel=1.0
May 28 1997 05:32:47:400PM	970528046	Yuichi Takase	Plasma 1.0MW transmitter screen overload
May 28 1997 05:33:02:200PM	970528047	Yuichi Takase	Fizzle

Physics Operator Comments
May 28 1997 08:26:34:330AM		Robert Granetz	Hybrid coldstart done; no problems
May 28 1997 08:59:16:500AM		Robert Granetz	Reload last shot of yesterday (970527054), but ramp CLEARIN down faster after t=1.3 s.
May 28 1997 08:59:35:440AM	970528001	Robert Granetz	Shot 01 -- No OH1, EF1's, TF. Note: we had to back out of a shot cycle prior running this shot, and that caused some of the PLC's to timeout. The same problem happened yesterday. Apparently we have to go through a full shot cycle to reset everything properly.
May 28 1997 09:13:20:470AM	970528002	Robert Granetz	Shot 02 -- Plasma. Good shot. Ip=0.8 MA, nl=0.9-1.0e20 m-2. Prf=0.3+ MW. Looks like there was an H-mode during the RF. Next shot: ramp CLEARIN down even faster after t=1.3 s. Program in an additional Btor ramp down to 2.6 T starting at t=0.8 s.
May 28 1997 09:26:41:640AM	970528003	Robert Granetz	Shot 03 -- Plasma. Btor rampdown to 2.6 T didn't quite flattop. Disrupted at t=1.21 s when q95 gets down to 2.6. Lower halo current of 200 kA. Two H-modes at the two different times. Next shot: get rid of 4.0 T flattop...rampdown to 2.6 T for most of the shot. Reduce Ip to 0.6 MA for most of the shot.
May 28 1997 09:37:21:350AM	970528004	Robert Granetz	Shot 04 -- Fizzle. 60 kA. Next shot: try again, no changes.
May 28 1997 09:46:49:660AM	970528005	Robert Granetz	Shot 05 -- Fizzle. Very dim. Next shot: Change Ip programming so that it's 0.8 MA until t=0.6 s, and then rampdown to 0.6 MA by t=0.75 s.
May 28 1997 09:54:00:780AM	970528006	Robert Granetz	Shot 06 -- Dud. Null looks crummy. Next shot: reduce Br offset from .0065 to .006
May 28 1997 10:11:50:390AM	970528007	Robert Granetz	Shot 07 -- Plasma. Good shot. Ip=0.8 MA until 0.6 s, then rampdown to 0.6 MA by t=0.75 s. Btor makes it down to 2.8 T at 1.0 s, then flattops. q95=3.1. Right gap ramps from 1 cm to 2 cm during the shot. No H-mode during the low-field RF pulse. Next shot: enable argon puff and move argon pulse earlier by 0.1 s. Also, ramp RCUR in by 5 mm during the shot to try and keep the outer gap constant.
May 28 1997 10:22:54:030AM	970528008	Robert Granetz	Shot 08 -- Plasma. Disrupted at 1.16 s. Argon? It came on strong but seems to pump out by 0.8 s. I had the wrong direction on the change to RCUR. Next shot: ramp RCUR outwards by 5 mm instead of inwards!
May 28 1997 10:41:16:190AM	970528008	Robert Granetz	There's a break in the action while Josh does something to one of the camac highways. It's taking longer than he told me it would.
May 28 1997 10:51:17:510AM	970528009	Robert Granetz	Shot 09 -- Fizzle. 60 kA. Null okay. Next shot: try again, no changes.
May 28 1997 11:02:39:890AM	970528010	Robert Granetz	Shot 10 -- Plasma. Good shot. Outboard gap stays pretty constant at 1.2 cm. Next shot: add another argon puff at t=1.0 s. Ramp CLEARIN down faster still at end of shot.
May 28 1997 11:08:26:010AM	970528011	Robert Granetz	Shot 11 -- Plasma. Disrupted at t=1.10 s. Second argon puff? Next shot: reduce 2nd argon puff from 27 to 20 ms.
May 28 1997 11:18:31:910AM	970528012	Robert Granetz	Shot 12 -- Plasma. Disrupted at t=0.71 s (during rampdown from 0.8 to 0.6 MA). No sign of any moly injection. No sign of any vertical instability. Next shot: no changes.
May 28 1997 11:30:19:690AM	970528013	Robert Granetz	Shot 13 -- Plasma. Disrupted at 1.34 s. Lots of magnetics camac errors, but Josh was able to recover the data. EFIT will have to be rerun. Next shot: no PCS changes, only RF timing changes.
May 28 1997 11:37:02:670AM	970528014	Robert Granetz	Shot 14 -- Fizzle. 50 kA. Null is not great. Next shot: try again, no changes.
May 28 1997 11:49:13:980AM	970528015	Robert Granetz	Shot 15 -- Plasma. Disrupted at 1.19 s. I don't think it's the argon. Next shot: no PCS changes. Brian's new B-FSP (Belching Fast Scanning Probe) will operate with helium on the next shot at t=0.7 s.
May 28 1997 12:00:30:110PM	970528016	Robert Granetz	Shot 16 -- Fizzle. 50 kA. Next shot: no changes
May 28 1997 12:05:47:990PM	970528017	Robert Granetz	Shot 17 -- Plasma. Disrupted at 1.34 s. Still no H-modes. Next shot: no changes.
May 28 1997 12:14:28:380PM	970528018	Robert Granetz	Shot 18 -- Fizzle. 50 kA. Null is fair. Next shot: no changes.
May 28 1997 12:24:38:690PM	970528019	Robert Granetz	Shot 19 -- Fizzle. 50 kA. Next shot: no changes.
May 28 1997 12:31:31:470PM	970528020	Robert Granetz	Shot 20 -- Fizzle. 50 kA. Time to make a change to the null. There is a little too much Bz. Next shot: add -15 amps to EF4 in segment 1.
May 28 1997 12:40:41:550PM	970528021	Robert Granetz	Shot 21 -- Fizzle. 45 kA. Next shot: try changing Br offset from .006 to .0065 (no good reason for doing this though).
May 28 1997 12:46:03:000PM	970528022	Robert Granetz	Shot 22 -- Fizzle. Very weak. Br got worse. Next shot: change Br offset from .0065 to .0055. If that doesn't do it, I'll reload an old shot.
May 28 1997 01:00:38:020PM	970528023	Robert Granetz	Shot 23 -- Plasma. Disrupted at 1.32 s. Prf=0.4 MW. No H-modes. Next shot: no PCS changes.
May 28 1997 01:12:30:100PM	970528024	Robert Granetz	Shot 24 -- Plasma. Disrupted at 1.25 s. No H-modes. Brian reports a very bright helium plume from the B-FSP. Next shot: tweak CLEARIN around t=1.25 s.
May 28 1997 01:24:53:010PM	970528025	Robert Granetz	Shot 25 -- Plasma. Disrupted at 1.30 s. Plasma is still not limited at the end of the shot. Next shot: rampdown CLEARIN even faster.
May 28 1997 01:38:00:720PM	970528026	Robert Granetz	Shot 26 -- Plasma. Disrupted at 1.08 s, at the start of the 2nd RF pulse. The TCI gate valve has closed prematurely during the last two shots. Next shot: turn off the argon valve permissive.
May 28 1997 01:50:26:650PM	970528027	Robert Granetz	Shot 27 -- Plasma. Great shot, ramped nearly all the way down. Magnetics camac errors, but I recovered the data. TCI is having bad problems with its gate valve. This shot was limited after 1.30 s. Argon?? Next shot: keep the argon off.
May 28 1997 01:57:09:660PM	970528028	Robert Granetz	Shot 28 -- Plasma. Another great shot, ramped nearly all the way down again. TCI didn't have a problem this time. Next shot: re-enable the argon, but get rid of the second puff, and reduce the first puff from 27 to 20 ms.
May 28 1997 02:06:21:030PM	970528029	Robert Granetz	Shot 29 -- Plasma. Good shot, but didn't last quite as long as the no-argon shots. Still no H-modes. Next shot: no changes.
May 28 1997 02:14:25:080PM	970528030	Robert Granetz	Shot 30 -- Plasma. Good shot. Next shot: reduce argon pulse from 20 to 18 ms.
May 28 1997 02:21:46:610PM	970528031	Robert Granetz	Shot 31 -- Plasma. Good shot. Next shot: no PCS changes.
May 28 1997 02:29:52:650PM	970528032	Robert Granetz	Shot 32 -- Plasma. Good shot. Next shot: no PCS changes
May 28 1997 02:39:20:670PM	970528033	Robert Granetz	Shot 33 -- Plasma. It's becoming pleasantly boring! I probably just jinxed it. The first RF pulse is reaching 0.8 MW. Second RF pulse is also ramping up. Next shot: no PCS changes.
May 28 1997 02:49:19:440PM	970528034	Robert Granetz	Shot 34 -- Plasma. Good shot. Next shot: no PCS changes
May 28 1997 02:57:05:220PM	970528035	Robert Granetz	Shot 35 -- Plasma. Good shot. Next shot: no PCS changes
May 28 1997 03:08:37:000PM	970528036	Robert Granetz	Shot 36 -- Plasma, but hard disruption at 0.65 s. Prad_2pi started increasing at 0.637 s. Next shot: turn off argon valve permissive
May 28 1997 03:15:44:360PM	970528037	Robert Granetz	Shot 37 -- Fizzle. 50 kA. Null looks okay. Next shot: try again, no changes.
May 28 1997 03:24:35:780PM	970528038	Robert Granetz	Shot 38 -- Plasma. Great shot, ramped almost all the way down (no argon). There was an H-mode on the first RF pulse, and a lot of dithering during the second RF pulse. Next shot: no PCS changes. Argon still disabled.
May 28 1997 03:31:10:960PM	970528039	Robert Granetz	Shot 39 -- Fizzle. 50 kA. Nice looking null. Next shot: no PCS changes. Re-enable argon valve.
May 28 1997 03:38:33:440PM	970528040	Robert Granetz	Shot 40 -- Fizzle. 50 kA. Next shot: try again, no changes.
May 28 1997 04:09:39:160PM	970528041	Robert Granetz	Shot 41 -- Plasma. Good shot. Disrupted at 1.36 s. Base pressure is remaining high between shots (>3e-6 torr). We are going to have a break in the action to allow a number of people cell access and lab access. But I hope to close up in time to try for a few more plasmas.
May 28 1997 04:23:46:160PM	970528042	Robert Granetz	Shot 42 -- Plasma. Good shot. Disrupted at 1.38 s. Only one RF pulse. Next shot: no PCS changes.
May 28 1997 04:31:43:550PM	970528043	Robert Granetz	Shot 43 -- Plasma. Good shot. Disrupted at 1.40 s. Only one RF pulse again. Next shot: no PCS changes.
May 28 1997 04:42:10:300PM	970528044	Robert Granetz	Shot 44 -- Plasma. Good shot. Disrupted at 1.40 s. Got both RF pulses, but no H-mode at the low field. Next shot: increase density demand from nl=0.9e20 to 1.1e20 m-2
May 28 1997 04:49:40:350PM	970528045	Robert Granetz	Shot 45 -- Plasma. Good shot. Got slightly higher density. Disrupted at 1.35 s. No magnetics traq_1 data. Prf=1 MW on the first pulse, lower on the second pulse. Next shot: increase density demand from nl=1.1 to 1.2e20 m-2.
May 28 1997 04:57:55:590PM	970528046	Robert Granetz	Shot 46 -- Plasma. Good shot. Disrupted at 1.30 s. Got the requested density. Only one RF pulse. Base pressure was very high just prior to this shot (3.7e-6 torr). Next shot: no PCS changes.
May 28 1997 05:02:07:390PM	970528047	Robert Granetz	Shot 47 -- Fizzle. Base pressure was 4.6e-6 just prior to this shot because we were rushing to squeeze in another shot. Nitrogen peak is very high. The leak is getting worse. End of run.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:45:05:400AM	Plasma	Ok	all supplies did not fire
2	08:59:20:570AM	Plasma	Ok	plasma shot#2 09:00
3	09:13:59:240AM	Plasma	Ok
4	09:29:07:020AM	Plasma	Ok
5	09:38:19:600AM	Plasma	Ok
6	09:48:07:500AM	Plasma	Ok
7	09:55:36:260AM	Plasma	Ok
8	10:13:57:910AM	Plasma	Ok
9	10:47:32:720AM	Plasma	Ok
10	10:53:55:790AM	Plasma	Ok
11	11:03:37:190AM	Plasma	Ok
12	11:10:54:960AM	Plasma	Ok
13	11:20:37:160AM	Plasma	Ok
14	11:31:53:860AM	Plasma	Ok
15	11:39:33:890AM	Plasma	Ok
16	11:51:09:130AM	Plasma	Ok
17	11:59:05:310AM	Plasma	Ok
18	12:06:27:130PM	Plasma	Ok
19	12:15:08:450PM	Plasma	Ok
20	12:24:33:780PM	Plasma	Ok
21	12:33:21:840PM	Plasma	Ok
22	12:41:50:870PM	Plasma	Ok
23	12:48:44:710PM	Plasma	Ok
24	01:01:31:600PM	Plasma	Ok
25	01:13:34:000PM	Plasma	Ok
26	01:26:09:200PM	Plasma	Ok
27	01:40:00:380PM	Plasma	Ok
28	01:52:26:830PM	Plasma	Ok
29	02:00:37:710PM	Plasma	Ok
30	02:07:59:450PM	Plasma	Ok
31	02:15:41:510PM	Plasma	Ok
32	02:24:07:810PM	Plasma	Ok
33	02:32:47:930PM	Plasma	Ok
34	02:42:27:280PM	Plasma	Ok
35	02:50:10:250PM	Plasma	Ok
36	03:00:32:030PM	Plasma	Ok
37	03:10:19:250PM	Plasma	Ok
38	03:18:19:400PM	Plasma	Ok
39	03:27:32:630PM	Plasma	Ok
40	03:35:02:780PM	Plasma	Ok
41	03:52:15:020PM	Plasma	Ok
42	04:19:43:990PM	Plasma	Ok
43	04:26:44:010PM	Plasma	Ok
44	04:33:40:300PM	Plasma	Ok
45	04:43:35:720PM	Plasma	Ok
46	04:53:03:090PM	Plasma	Ok
47	04:59:21:020PM	Plasma	Ok