Alcator C-Mod Run 930616 Information

Miniproposals

Miniproposal:

Date Filed:

Title:

First Author:

Session Leader: Robert Granetz (shots 1-28)

Operators
Session leader(s):	Robert Granetz
Physics operator(s):	Earl Marmar
Engineering operator(s):	Joe Daigle,Frank Silva

Engineering Operator Run Comment
Plasma run

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:07:900PM

Author: To Be Determined

Summary of run 930616.

The goals for this run:

1) Attempt to evaluate effects of ECDC on plasma performance.
2) Improve the plasma position feedback control
3) Investigate possibilities to form diverted configuration
4) Bring ECE on-line and put argon in the plasma for HIREX

The run was preceeded by 50 minutes of ECDC in H2. This was terminated at
8:15, and the first plasma shot was taken 1 hour later.
After 1 attempt with no TF (switch on TF cabinet left in local mode), we
had 28 good shots in a row (kudos to the engineers).

Results:

1) ECDC -- ECDC before the run brought the water level on the RGA up
somewhat, but there was no obvious degradation of plasma performance. We
ran ECDC in H2 between shots 7 and 8. Shot 8 showed higer density, higher
Zeff (2 vs 1.5) and slightly higher radiated power (~10%). By shot 9,
things were pretty much back to the way they had been for shot 7. We ran
ECDC in He between shots 12 and 13 (for 3.5 minutes) and between shots 14
and 15 (for 12.5 minutes). There were no discernible effects on the post
ECDC shots.

2) Position feedback -- Steve Horne fiddled with the feedback algorithms
through the day, mostly playing with Z_cur and also R_cur. Some improvement
in position control was noted.

3) Attempts were made to elongate the plasma using EF1's and EF2's. There
was some evidence that divertor configurations were achieved, particularly
during shot 28, where Granetz's UV arrays showed something happening
towards the top divertor, and both Ian's and Steve Wolfe's reconstructions
indicated the last closed flux surface was well away from the limiter.

4) The Michelson successfully ran, and uncalibrated Te profiles were
obtained. Various quantities of argon were puffed into 4 discharges, and
HIREX had reasonable signals on 3 shots. Both He-like and H-like spectra
were obtained. Post shot argon test pulses showed that the response is very
slow, with the first pressure rise in the chamber taking approximately 150
ms to appear.

We noticed that on some shots, the fill pressure would drop by about 8% after
the transition from init to check. John Goetz figured out that this was due
to the opening of the ECE beam line gate valve. In future, the valve will
open on the transition to init, but we need to consider this effect for
diagnostics which want to open their gate valves at the transition to
pulse, since a 10% change in fill pressure has demonstrable effects on the
plasma evolution during the current rise.

Physics Operator Summaries

Session Leader Comments

Jun 16 1993 09:04:14:400AM Robert Granetz Session leader: E. Marmar
Assistant: R. Granetz
Head engineers: F. Silva/J. Daigle

Prior to this run:

ECDC in hydrogen was done yesterday in between the power supply tests. This
morning addition ECDC in H2 was done again for about 50 minutes. Base pressure
before shot 001 today is at 1.e-6 torr. No new leaks after the one yesterday
morning. Partial pressure of N2 and H2O is of order 10**-7 torr. Not too good.

Plan for today's run:

Try to see if wall conditioning (using ECDC in H2 and/or He) affects the
reproducibility of the plasma discharges. We will start by trying to
repeat shot 930611023 from last Friday's run.

Initial fill pressure will be 4.e-5 torr.

Jun 16 1993 05:44:40:070PM Earl Marmar 29 shots in the run. First shot had no TF (switch in local). After that, got 28 decent shots in a row.
Shot 28 showed some evidence of being diverted. ECE operated for the first time. HIREX saw He- and H-like
argon spectra. ECDC was run between shots 3 times, once in hydrogen, twice in helium. The shot after H2 ECDC
appeared to be higher Z with more radiated power and higher density. He ECDC had no obvious effects on the
subsequent shots.

Jun 16 1993 09:09:12:260AM 930616001 Robert Granetz No TF due to operator error.

Jun 16 1993 09:30:57:120AM 930616002 Robert Granetz Good shot! Ipmax=0.21 MA. Good sawteeth until first disruption at
0.144 s. Duration=0.257 s. As usual, the shot has multiple disruptions
after the initial one.

Jun 16 1993 09:35:15:920AM 930616002 Robert Granetz The next shot will be a repeat except that the fill pressure will be
reduced from 4.0 to 3.7e-5 torr.

Jun 16 1993 09:45:03:980AM 930616003 Robert Granetz Great shot! Ipmax=0.27 MA. Multiple disruptions don't start until
0.224 s. Shot is sawtoothing until that first disruption. Centroid
position looks very good.

Jun 16 1993 09:55:40:890AM 930616003 Robert Granetz The next shot will have the OH2U&L programming symmetrised after the
crowbar at 0.120 sec. Due to pecularities in the power supplies, the
programming was previously required to be slightly different for the
two supplies during hard inversion. This was supposed to have been
fixed during the past few maintenance days.

Jun 16 1993 09:58:34:260AM 930616004 Robert Granetz Another great one. Very similar to the previous shot.

Jun 16 1993 10:11:44:750AM 930616005 Robert Granetz Change for shot 5:
Raised gain on Zcur PID from .15 to .25 and extended it out
to .4 from .35 seconds

Jun 16 1993 10:19:37:980AM 930616005 Robert Granetz Another great one, another copy of the previous two shots. Duration=0.355 s.

Jun 16 1993 10:21:35:720AM 930616005 Robert Granetz For next shot, derivative gain on Z_cur will be turned on. The setting
will be 0.1 after 0.070 s.

Jun 16 1993 10:35:29:150AM 930616006 Robert Granetz Not as good as the previous 3 shots, but still not bad. Ipmax=0.27 MA,
duration=0.28 s. Position control was excellent (especially Z of centroid)
until a bright spot occurred on the outer limiter at about 0.17 s.

Jun 16 1993 10:44:18:220AM 930616006 Robert Granetz Notes on this shot:
The actual gas fill pressure was 3.3e-5 rather than the requested 3.7e-5.
Ian noticed that the density during the early current rise was slightly
higher on this shot (006) than the previous shot (005). There were also
some hard x-rays on this shot.

Jun 16 1993 11:55:16:050AM 930616006 Robert Granetz For the next shot, tweak fill pressure from 3.7 to 3.8e-5 torr.

Jun 16 1993 11:30:35:000AM 930616007 Robert Granetz Great shot. Duration=0.364 s. Similar to shots 3,4, & 5. Sawtoothing until
the first disruption at 0.236 s. Position control was very good until the
power supplies run out of current.

Between this shot and the next shot (008) we will turn on ECDC for about
10 minutes (using H2)

Jun 16 1993 11:42:51:090AM 930616008 Robert Granetz Ipmax=0.20 MA. However, the shot was different. It was higher density than
previous shots, and Zeff was close to 2.0. Presumably this has to do with
the H2O increase caused by the discharge cleaning. There was a big disruption
at 0.196 s. Plasma was sawtoothing until then.

Programming notes: (dictated by S. Horne) EF2's included in Z_CUR controller.
M matrix values are identical to the OH2's.
The, ugh, PID gains for shot 008 were P=0.25, D=0.1 from t=0.070 s to 0.4 s.

For shot 009, the derivative gain on Z_CUR will be 0.2. Also for the next
shot, the fill pressure will be lowered from 3.8 to 3.5e-5 torr.

Jun 16 1993 11:50:21:000AM 930616009 Robert Granetz Great shot again. Similar to #3,4,5 and 7. Ipmax=0.25 MA. Position was
good, but not quite as good as before. Radiated power was 10% lower than
the last shot. Shot was sawtoothing until the first little disruption
at 0.217 s.

Jun 16 1993 11:52:39:480AM 930616009 Robert Granetz The Zeff decreased on this shot (from 2. on the previous one down to 1.5 on
this one.)

Jun 16 1993 11:56:56:490AM 930616009 Robert Granetz For the next shot (010) some tweaks were made to the gas programming (B-top).

Jun 16 1993 12:11:54:960PM 930616010 Robert Granetz Another good one. Similar to other good shots today. Changes in the gas
programming showed up in the density. The initial density rate of rise was
decreased, and the pumpout between 0.14 and 0.2 sec is not as noticeable.

Jun 16 1993 12:13:33:910PM 930616010 Robert Granetz For the next shot, the derivative gain on Z_CUR was doubled to 0.4, and some
more tweaks were made on the pulse gas programming

Jun 16 1993 12:24:42:260PM 930616011 Robert Granetz Quite a bit different. Ipmax=0.32 MA. Duration=0.30 s.
There were no sawteeth until 0.14 s. The first disruption is at 0.202 s.
This was the first shot today that had a high signal on the RF outboard
limiter probes during the first 100 msec of the shot (and no sawtoothing)
Position was not much different than previous shots.

Jun 16 1993 12:25:48:440PM 930616011 Robert Granetz For the next shot (012), the proportional gain on Z_CUR will be raised from
0.25 to 0.4, for t=0.070 to 0.4 sec.

Jun 16 1993 12:27:44:750PM 930616011 Robert Granetz Also, the fill pressure for the next shot (012) will be raised from 3.5 to
3.8e-5 torr.

Jun 16 1993 12:41:15:670PM 930616012 Robert Granetz Similar to the last shot. Ipmax=0.32 MA. No sawteeth until 0.14 s.
Disruptions begin at 0.201 s. High signal on outer limiter probe early in
the shot. Centroid position was good.

Jun 16 1993 12:42:09:050PM 930616012 Robert Granetz Between this shot (012) and the next shot (013), we will ECDC in helium
for about 10 minutes

Jun 16 1993 12:48:20:730PM 930616012 Robert Granetz The ECDC tripped off because of a cryo interlock problem, so we only had
it for 3.5 minutes.

Jun 16 1993 12:50:17:370PM 930616012 Robert Granetz Also, for the next shot, the pre-programmed voltages for the OH2U&L has been
set back to the asymmetric demands, as used in shot 001.

Jun 16 1993 12:59:27:940PM 930616013 Robert Granetz A carbon copy of the last shot.

Jun 16 1993 01:13:17:350PM 930616014 Robert Granetz Very similar to the previous two shots. First disruption is at 0.198 s,
duration=0.305 s. Centroid position is good, as usual, until the disruptions
begin. Ipmax=0.32 MA. No sawtoothing until after 0.14 s.

Jun 16 1993 01:14:22:890PM 930616014 Robert Granetz Between this shot (014) and the next shot (015), we will try again to ECDC
in helium for 10 minutes.

Jun 16 1993 01:29:01:390PM 930616014 Robert Granetz Note: the ECDC in helium lasted 12.5 minutes.
Also, a test gas pulse has been enabled at 0.6 sec using the B-side-lower valve.

Jun 16 1993 01:46:01:710PM 930616015 Robert Granetz Another good shot. Very similar to the previous shot (014). No obvious
effects of the helium discharge cleaning.

For the next shot, the test gas pulse on B-side is being lengthened from
6 ms to 18 ms (amplitude=90V)

Jun 16 1993 01:53:39:990PM 930616016 Robert Granetz Repeat of previous shot. Nearly identical.

Jun 16 1993 01:56:50:800PM 930616016 Robert Granetz For the next shot (017) the "test" gas pulse on B-side will be triggered at
t=0.150 s for a duration of 6 ms, thus no longer being a "test".

Jun 16 1993 01:59:51:220PM 930616016 Robert Granetz Note for the next shot (017):
The R_CUR controller EF3 M term has been increased at 0.220 s from 1.5e-2
to 3.0e-2 volts/amp-meter

Jun 16 1993 02:08:42:070PM 930616017 Robert Granetz Another carbon copy. No observable effects of the B-side gas pulse.

Jun 16 1993 02:10:20:500PM 930616017 Robert Granetz For the next shot (018): raise proportional gain from 1. to 2. for EF1's from
t=0.060 to end of shot.

Jun 16 1993 02:14:20:470PM 930616017 Robert Granetz For next shot (018), B-side gas pulse has been moved from 0.150 to 0.120 s and
lengthened from 6 to 12 ms wide

Jun 16 1993 02:22:17:990PM 930616018 Robert Granetz Another near carbon copy.

Important note: the B-side gas pulse is, and has been, A R G O N !!

Jun 16 1993 02:32:32:640PM 930616018 Robert Granetz For the next shot, the B-side argon pulse will be moved from 0.120 to
0.100 s and the width will be increased from 12 ms to 20 ms.

Jun 16 1993 02:34:01:330PM 930616018 Robert Granetz Note: so far, the effects of argon have not been observed on any plasma
diagnostic.

Jun 16 1993 02:42:38:920PM 930616019 Robert Granetz Another carbon copy. The argon is still not showing up on anything except
the RGA.

Jun 16 1993 02:45:41:950PM 930616019 Robert Granetz For the next shot, the B-side argon puff has been moved earlier from 0.100 to
0.070 s. The pulse width has remained at 20 ms.

Jun 16 1993 02:58:07:650PM 930616020 Robert Granetz Well I think we finally saw the effects of the argon. Some of the XTOMO
channels saturated around 0.1 s. The radiated power was about 10% higher
but Zeff was not affected noticeably. Also, HIREX did not see any argon,
but they were looking for the hydrogen-like line.

Jun 16 1993 03:00:36:050PM 930616020 Robert Granetz For the next shot (021), the controller for Z_CUR (i.e. radial field) has
be changed by removing the EF2's and substituting in the EF1's at an M value
of 3.e-2 volts/amp-meter. Also, the change in the R_CUR EF3 controller will
be stepped up to 4e-2 at t=0.200 s.

Jun 16 1993 03:12:20:630PM 930616021 Robert Granetz Similar to the previous shot. X-rays saturated again from 0.10 to 0.13 s.

Jun 16 1993 03:14:24:620PM 930616021 Robert Granetz For the next shot (022), the argon puff will be turned off and lowering the
fill pressure from 3.8 to 3.5e-5 torr.

Jun 16 1993 03:25:19:500PM 930616022 Robert Granetz Another repeat. This time the XTOMO channels did not saturate. Probably was
because the argon puff was turned off, but it might also be due to the
small change in pre-fill pressure.

For the next shot, turn the argon back on and keep the pre-fill pressure
the same.

Jun 16 1993 03:28:24:210PM 930616022 Robert Granetz For the next shot (023) we will try and divert the plasma from t=0.120 to
0.160 s by programming the EF1's from 1 kA to 1.5 kA during that time.
Towards the end of the pulse (0.250 s), we want to zero the EF1's so that
the plasma does not die with an elongated shape.

Jun 16 1993 03:30:21:000PM 930616022 Robert Granetz Note: for the next shot (023) the argon puff has been moved from t=0.070 to
t=0.010 s and the width remains at 20 ms

Jun 16 1993 03:31:49:620PM 930616022 Robert Granetz Note: the pulse gas was also tweaked (lowered) at about t=0.1 s in an attempt
to get less density later in the shot

Jun 16 1993 03:45:56:120PM 930616023 Robert Granetz Repeat shot, similar to previous ones except that the disruptions terminate
the plasma earlier than "normal". The XTOMO stuff saturated late in
the shot (t>0.18 s), presumably due to the early argon pulse. HIREX saw
argon lines.

Jun 16 1993 03:54:55:400PM 930616023 Robert Granetz For the next shot (024), the argon gas puff will be moved from 0.010 s to
-0.036 s, and the pulse width will be shortened from 20 to 16 ms.

Also, the programmed demand on the EF1's will be raised in order to try
and divert the plasma. The plasma was apparently not diverted on
this (023) shot, possibly due to not enough demand on the EF1's

Jun 16 1993 04:04:11:220PM 930616024 Robert Granetz Ipmax=0.30 MA. More radiated power and x-ray emission than on previous
shots. Disruptions start a little earlier (0.177 s). There were more
hard x-rays than on previous shots.

Jun 16 1993 04:05:49:850PM 930616024 Robert Granetz For the next shot (025) the argon puff will be turned off, and the pre-fill
pressure will be increased from 3.5 to 3.8e-5 torr.

Also, the demand for the EF1 currents will be increased by 500 amps. Still
no sign of a diverted plasma on the XUV divertor array.

Jun 16 1993 04:16:28:410PM 930616025 Robert Granetz Great shot! Ipmax=0.31 MA. Duration=0.254 s. Plasma was sawtoothing after
0.1 s until a single disruption at 0.218 s. There were no more disruptions
until the plasma current terminates. Centroid position was good, as it has
been all day. Still no sign of a diverted plasma.

Jun 16 1993 04:17:47:040PM 930616025 Robert Granetz Since there was no argon puff, the XTOMO channels did not saturate on
this shot.

Jun 16 1993 04:20:24:000PM 930616025 Robert Granetz For the next shot (026) the pre-fill pressure will be lowered from 3.8 to
3.5e-5 torr. There has been some variation in the actual pressure due to
the ECE, which came on line today. When the ECE gate valve opens during
the check phase, the torus pressure drops, and the TORVAC plc takes a while
to bring the pressure back to the demand.

Jun 16 1993 04:32:46:410PM 930616026 Robert Granetz Very similar to the previous (025) shot. Ipmax=0.31 MA, duration=0.258 s.
Again there is a single disruption at 0.214 s, and no more disruptions
prior to the one which ends the shot.

Jun 16 1993 04:36:36:840PM 930616026 Robert Granetz For the next shot (027): EF2 current programming has been increased by
500 amps from t=0.14 to 0.16 s to try and aid in diverting the plasma.
The elongation has been increasing, but it has not diverted the plasma yet.

Jun 16 1993 04:46:42:660PM 930616027 Robert Granetz Beautiful shot! Sawtoothing until a single disruption at 0.253 s.
Ipmax=0.30 s, duration=0.276 s. Position control was good until 0.2 s, when
the centroid starting moving a few cm downward. XTOMO channels saturated
from 0.8 to 1.2 s, presumably due to molybdenum.

Jun 16 1993 04:52:00:080PM 930616027 Robert Granetz For the next shot (028): argon puff is back on and EF1's and EF2's are
being raised again by 500 amps.

Jun 16 1993 10:48:11:520PM 930616027 Robert Granetz Side UV array sees extra emission in the upper part of
the plasma. Could be an upper diverted plasma?

Jun 16 1993 05:53:08:130PM 930616028 Robert Granetz Another great shot. Side UV array sees extra emission in the upper part of
the plasma. Could be an upper diverted plasma?

Jun 16 1993 10:31:20:580PM 930616028 Robert Granetz There was an argon gas puff on this shot.

Jun 16 1993 10:29:12:830PM 930616029 Robert Granetz Not quite as good a shot. Plasma disrupts earlier than it has been on recent
shots...first disruption is at about 0.165 s, and plasma ends at about 0.20 s.
This may have been due to excessive elongation due to the programming of
the EF1's and EF2's, in an attempt to divert the plasma.

Physics Operator Comments

Engineering Operator Comments

Shot Time Type Status Comment

1 09:04:37:280AM Plasma Ok no tf ps in local mode

2 09:17:29:740AM Plasma Ok PLASMA SHOT NO FAULTS

3 09:36:05:710AM Plasma Ok OK PLASMA NOFAULTS

4 09:54:04:230AM Plasma Ok PLASMA SHOT NO FAULTS

5 10:11:00:050AM Plasma Ok PLASMA SHOT NO FAULTS

6 10:25:46:810AM Plasma Ok PLASMA SHOT NO FAULTS

7 11:25:26:530AM Test Bad

8 11:28:13:070AM Plasma Ok PLASMA SHOT NO FAULTS.

9 11:41:30:980AM Plasma Ok PLASMA SHOT NO FAULTS.

10 11:58:01:010AM Plasma Ok PLASMA SHOT NO FAULTS

11 12:14:42:930PM Plasma Ok PLASMA SHOT NO FAULTS.

12 12:31:50:290PM Plasma Ok PLASMA SHOT NO FAULTS.

13 12:51:20:150PM Plasma Ok PLASMA

14 01:06:01:580PM Plasma Ok PLASMA ECDC

15 01:28:56:700PM Plasma Ok PLASMA

16 01:44:37:860PM Plasma Ok NO FAULTS 320KA

17 01:59:12:580PM Plasma Ok PLASMA SHOT NO FAULTS.

18 02:15:16:840PM Plasma Ok PASMA SHOT NO FAULTS

19 02:33:17:880PM Plasma Ok PLASMA SHOT NO FAULTS.

20 02:47:25:850PM Plasma Ok PLASMA SHOT NO FAULTS.

21 03:02:52:920PM Plasma Ok PLASMA -- NO FAULTS

22 03:16:43:280PM Plasma Ok PLASMA SHOT NO FAULTS.

23 03:30:29:690PM Plasma Ok PLASMA SHOT NO FAULTS.

24 03:52:33:230PM Plasma Ok PLASMA SHOT NO FAULTS.

25 04:06:55:540PM Plasma Ok PLASMA SHOT NO FAULTS.

26 04:20:49:570PM Plasma Ok PLASNA SHOT NO FAULTS.

27 04:35:05:350PM Plasma Ok PLASMA SHOT NO FAULTS.

28 04:49:03:170PM Plasma Ok PLASMA SHOT NO FAULTS.

Session Leader Comments
Jun 16 1993 09:04:14:400AM		Robert Granetz	Session leader: E. Marmar Assistant: R. Granetz Head engineers: F. Silva/J. Daigle Prior to this run: ECDC in hydrogen was done yesterday in between the power supply tests. This morning addition ECDC in H2 was done again for about 50 minutes. Base pressure before shot 001 today is at 1.e-6 torr. No new leaks after the one yesterday morning. Partial pressure of N2 and H2O is of order 10**-7 torr. Not too good. Plan for today's run: Try to see if wall conditioning (using ECDC in H2 and/or He) affects the reproducibility of the plasma discharges. We will start by trying to repeat shot 930611023 from last Friday's run. Initial fill pressure will be 4.e-5 torr.
Jun 16 1993 05:44:40:070PM		Earl Marmar	29 shots in the run. First shot had no TF (switch in local). After that, got 28 decent shots in a row. Shot 28 showed some evidence of being diverted. ECE operated for the first time. HIREX saw He- and H-like argon spectra. ECDC was run between shots 3 times, once in hydrogen, twice in helium. The shot after H2 ECDC appeared to be higher Z with more radiated power and higher density. He ECDC had no obvious effects on the subsequent shots.
Jun 16 1993 09:09:12:260AM	930616001	Robert Granetz	No TF due to operator error.
Jun 16 1993 09:30:57:120AM	930616002	Robert Granetz	Good shot! Ipmax=0.21 MA. Good sawteeth until first disruption at 0.144 s. Duration=0.257 s. As usual, the shot has multiple disruptions after the initial one.
Jun 16 1993 09:35:15:920AM	930616002	Robert Granetz	The next shot will be a repeat except that the fill pressure will be reduced from 4.0 to 3.7e-5 torr.
Jun 16 1993 09:45:03:980AM	930616003	Robert Granetz	Great shot! Ipmax=0.27 MA. Multiple disruptions don't start until 0.224 s. Shot is sawtoothing until that first disruption. Centroid position looks very good.
Jun 16 1993 09:55:40:890AM	930616003	Robert Granetz	The next shot will have the OH2U&L programming symmetrised after the crowbar at 0.120 sec. Due to pecularities in the power supplies, the programming was previously required to be slightly different for the two supplies during hard inversion. This was supposed to have been fixed during the past few maintenance days.
Jun 16 1993 09:58:34:260AM	930616004	Robert Granetz	Another great one. Very similar to the previous shot.
Jun 16 1993 10:11:44:750AM	930616005	Robert Granetz	Change for shot 5: Raised gain on Zcur PID from .15 to .25 and extended it out to .4 from .35 seconds
Jun 16 1993 10:19:37:980AM	930616005	Robert Granetz	Another great one, another copy of the previous two shots. Duration=0.355 s.
Jun 16 1993 10:21:35:720AM	930616005	Robert Granetz	For next shot, derivative gain on Z_cur will be turned on. The setting will be 0.1 after 0.070 s.
Jun 16 1993 10:35:29:150AM	930616006	Robert Granetz	Not as good as the previous 3 shots, but still not bad. Ipmax=0.27 MA, duration=0.28 s. Position control was excellent (especially Z of centroid) until a bright spot occurred on the outer limiter at about 0.17 s.
Jun 16 1993 10:44:18:220AM	930616006	Robert Granetz	Notes on this shot: The actual gas fill pressure was 3.3e-5 rather than the requested 3.7e-5. Ian noticed that the density during the early current rise was slightly higher on this shot (006) than the previous shot (005). There were also some hard x-rays on this shot.
Jun 16 1993 11:55:16:050AM	930616006	Robert Granetz	For the next shot, tweak fill pressure from 3.7 to 3.8e-5 torr.
Jun 16 1993 11:30:35:000AM	930616007	Robert Granetz	Great shot. Duration=0.364 s. Similar to shots 3,4, & 5. Sawtoothing until the first disruption at 0.236 s. Position control was very good until the power supplies run out of current. Between this shot and the next shot (008) we will turn on ECDC for about 10 minutes (using H2)
Jun 16 1993 11:42:51:090AM	930616008	Robert Granetz	Ipmax=0.20 MA. However, the shot was different. It was higher density than previous shots, and Zeff was close to 2.0. Presumably this has to do with the H2O increase caused by the discharge cleaning. There was a big disruption at 0.196 s. Plasma was sawtoothing until then. Programming notes: (dictated by S. Horne) EF2's included in Z_CUR controller. M matrix values are identical to the OH2's. The, ugh, PID gains for shot 008 were P=0.25, D=0.1 from t=0.070 s to 0.4 s. For shot 009, the derivative gain on Z_CUR will be 0.2. Also for the next shot, the fill pressure will be lowered from 3.8 to 3.5e-5 torr.
Jun 16 1993 11:50:21:000AM	930616009	Robert Granetz	Great shot again. Similar to #3,4,5 and 7. Ipmax=0.25 MA. Position was good, but not quite as good as before. Radiated power was 10% lower than the last shot. Shot was sawtoothing until the first little disruption at 0.217 s.
Jun 16 1993 11:52:39:480AM	930616009	Robert Granetz	The Zeff decreased on this shot (from 2. on the previous one down to 1.5 on this one.)
Jun 16 1993 11:56:56:490AM	930616009	Robert Granetz	For the next shot (010) some tweaks were made to the gas programming (B-top).
Jun 16 1993 12:11:54:960PM	930616010	Robert Granetz	Another good one. Similar to other good shots today. Changes in the gas programming showed up in the density. The initial density rate of rise was decreased, and the pumpout between 0.14 and 0.2 sec is not as noticeable.
Jun 16 1993 12:13:33:910PM	930616010	Robert Granetz	For the next shot, the derivative gain on Z_CUR was doubled to 0.4, and some more tweaks were made on the pulse gas programming
Jun 16 1993 12:24:42:260PM	930616011	Robert Granetz	Quite a bit different. Ipmax=0.32 MA. Duration=0.30 s. There were no sawteeth until 0.14 s. The first disruption is at 0.202 s. This was the first shot today that had a high signal on the RF outboard limiter probes during the first 100 msec of the shot (and no sawtoothing) Position was not much different than previous shots.
Jun 16 1993 12:25:48:440PM	930616011	Robert Granetz	For the next shot (012), the proportional gain on Z_CUR will be raised from 0.25 to 0.4, for t=0.070 to 0.4 sec.
Jun 16 1993 12:27:44:750PM	930616011	Robert Granetz	Also, the fill pressure for the next shot (012) will be raised from 3.5 to 3.8e-5 torr.
Jun 16 1993 12:41:15:670PM	930616012	Robert Granetz	Similar to the last shot. Ipmax=0.32 MA. No sawteeth until 0.14 s. Disruptions begin at 0.201 s. High signal on outer limiter probe early in the shot. Centroid position was good.
Jun 16 1993 12:42:09:050PM	930616012	Robert Granetz	Between this shot (012) and the next shot (013), we will ECDC in helium for about 10 minutes
Jun 16 1993 12:48:20:730PM	930616012	Robert Granetz	The ECDC tripped off because of a cryo interlock problem, so we only had it for 3.5 minutes.
Jun 16 1993 12:50:17:370PM	930616012	Robert Granetz	Also, for the next shot, the pre-programmed voltages for the OH2U&L has been set back to the asymmetric demands, as used in shot 001.
Jun 16 1993 12:59:27:940PM	930616013	Robert Granetz	A carbon copy of the last shot.
Jun 16 1993 01:13:17:350PM	930616014	Robert Granetz	Very similar to the previous two shots. First disruption is at 0.198 s, duration=0.305 s. Centroid position is good, as usual, until the disruptions begin. Ipmax=0.32 MA. No sawtoothing until after 0.14 s.
Jun 16 1993 01:14:22:890PM	930616014	Robert Granetz	Between this shot (014) and the next shot (015), we will try again to ECDC in helium for 10 minutes.
Jun 16 1993 01:29:01:390PM	930616014	Robert Granetz	Note: the ECDC in helium lasted 12.5 minutes. Also, a test gas pulse has been enabled at 0.6 sec using the B-side-lower valve.
Jun 16 1993 01:46:01:710PM	930616015	Robert Granetz	Another good shot. Very similar to the previous shot (014). No obvious effects of the helium discharge cleaning. For the next shot, the test gas pulse on B-side is being lengthened from 6 ms to 18 ms (amplitude=90V)
Jun 16 1993 01:53:39:990PM	930616016	Robert Granetz	Repeat of previous shot. Nearly identical.
Jun 16 1993 01:56:50:800PM	930616016	Robert Granetz	For the next shot (017) the "test" gas pulse on B-side will be triggered at t=0.150 s for a duration of 6 ms, thus no longer being a "test".
Jun 16 1993 01:59:51:220PM	930616016	Robert Granetz	Note for the next shot (017): The R_CUR controller EF3 M term has been increased at 0.220 s from 1.5e-2 to 3.0e-2 volts/amp-meter
Jun 16 1993 02:08:42:070PM	930616017	Robert Granetz	Another carbon copy. No observable effects of the B-side gas pulse.
Jun 16 1993 02:10:20:500PM	930616017	Robert Granetz	For the next shot (018): raise proportional gain from 1. to 2. for EF1's from t=0.060 to end of shot.
Jun 16 1993 02:14:20:470PM	930616017	Robert Granetz	For next shot (018), B-side gas pulse has been moved from 0.150 to 0.120 s and lengthened from 6 to 12 ms wide
Jun 16 1993 02:22:17:990PM	930616018	Robert Granetz	Another near carbon copy. Important note: the B-side gas pulse is, and has been, A R G O N !!
Jun 16 1993 02:32:32:640PM	930616018	Robert Granetz	For the next shot, the B-side argon pulse will be moved from 0.120 to 0.100 s and the width will be increased from 12 ms to 20 ms.
Jun 16 1993 02:34:01:330PM	930616018	Robert Granetz	Note: so far, the effects of argon have not been observed on any plasma diagnostic.
Jun 16 1993 02:42:38:920PM	930616019	Robert Granetz	Another carbon copy. The argon is still not showing up on anything except the RGA.
Jun 16 1993 02:45:41:950PM	930616019	Robert Granetz	For the next shot, the B-side argon puff has been moved earlier from 0.100 to 0.070 s. The pulse width has remained at 20 ms.
Jun 16 1993 02:58:07:650PM	930616020	Robert Granetz	Well I think we finally saw the effects of the argon. Some of the XTOMO channels saturated around 0.1 s. The radiated power was about 10% higher but Zeff was not affected noticeably. Also, HIREX did not see any argon, but they were looking for the hydrogen-like line.
Jun 16 1993 03:00:36:050PM	930616020	Robert Granetz	For the next shot (021), the controller for Z_CUR (i.e. radial field) has be changed by removing the EF2's and substituting in the EF1's at an M value of 3.e-2 volts/amp-meter. Also, the change in the R_CUR EF3 controller will be stepped up to 4e-2 at t=0.200 s.
Jun 16 1993 03:12:20:630PM	930616021	Robert Granetz	Similar to the previous shot. X-rays saturated again from 0.10 to 0.13 s.
Jun 16 1993 03:14:24:620PM	930616021	Robert Granetz	For the next shot (022), the argon puff will be turned off and lowering the fill pressure from 3.8 to 3.5e-5 torr.
Jun 16 1993 03:25:19:500PM	930616022	Robert Granetz	Another repeat. This time the XTOMO channels did not saturate. Probably was because the argon puff was turned off, but it might also be due to the small change in pre-fill pressure. For the next shot, turn the argon back on and keep the pre-fill pressure the same.
Jun 16 1993 03:28:24:210PM	930616022	Robert Granetz	For the next shot (023) we will try and divert the plasma from t=0.120 to 0.160 s by programming the EF1's from 1 kA to 1.5 kA during that time. Towards the end of the pulse (0.250 s), we want to zero the EF1's so that the plasma does not die with an elongated shape.
Jun 16 1993 03:30:21:000PM	930616022	Robert Granetz	Note: for the next shot (023) the argon puff has been moved from t=0.070 to t=0.010 s and the width remains at 20 ms
Jun 16 1993 03:31:49:620PM	930616022	Robert Granetz	Note: the pulse gas was also tweaked (lowered) at about t=0.1 s in an attempt to get less density later in the shot
Jun 16 1993 03:45:56:120PM	930616023	Robert Granetz	Repeat shot, similar to previous ones except that the disruptions terminate the plasma earlier than "normal". The XTOMO stuff saturated late in the shot (t>0.18 s), presumably due to the early argon pulse. HIREX saw argon lines.
Jun 16 1993 03:54:55:400PM	930616023	Robert Granetz	For the next shot (024), the argon gas puff will be moved from 0.010 s to -0.036 s, and the pulse width will be shortened from 20 to 16 ms. Also, the programmed demand on the EF1's will be raised in order to try and divert the plasma. The plasma was apparently not diverted on this (023) shot, possibly due to not enough demand on the EF1's
Jun 16 1993 04:04:11:220PM	930616024	Robert Granetz	Ipmax=0.30 MA. More radiated power and x-ray emission than on previous shots. Disruptions start a little earlier (0.177 s). There were more hard x-rays than on previous shots.
Jun 16 1993 04:05:49:850PM	930616024	Robert Granetz	For the next shot (025) the argon puff will be turned off, and the pre-fill pressure will be increased from 3.5 to 3.8e-5 torr. Also, the demand for the EF1 currents will be increased by 500 amps. Still no sign of a diverted plasma on the XUV divertor array.
Jun 16 1993 04:16:28:410PM	930616025	Robert Granetz	Great shot! Ipmax=0.31 MA. Duration=0.254 s. Plasma was sawtoothing after 0.1 s until a single disruption at 0.218 s. There were no more disruptions until the plasma current terminates. Centroid position was good, as it has been all day. Still no sign of a diverted plasma.
Jun 16 1993 04:17:47:040PM	930616025	Robert Granetz	Since there was no argon puff, the XTOMO channels did not saturate on this shot.
Jun 16 1993 04:20:24:000PM	930616025	Robert Granetz	For the next shot (026) the pre-fill pressure will be lowered from 3.8 to 3.5e-5 torr. There has been some variation in the actual pressure due to the ECE, which came on line today. When the ECE gate valve opens during the check phase, the torus pressure drops, and the TORVAC plc takes a while to bring the pressure back to the demand.
Jun 16 1993 04:32:46:410PM	930616026	Robert Granetz	Very similar to the previous (025) shot. Ipmax=0.31 MA, duration=0.258 s. Again there is a single disruption at 0.214 s, and no more disruptions prior to the one which ends the shot.
Jun 16 1993 04:36:36:840PM	930616026	Robert Granetz	For the next shot (027): EF2 current programming has been increased by 500 amps from t=0.14 to 0.16 s to try and aid in diverting the plasma. The elongation has been increasing, but it has not diverted the plasma yet.
Jun 16 1993 04:46:42:660PM	930616027	Robert Granetz	Beautiful shot! Sawtoothing until a single disruption at 0.253 s. Ipmax=0.30 s, duration=0.276 s. Position control was good until 0.2 s, when the centroid starting moving a few cm downward. XTOMO channels saturated from 0.8 to 1.2 s, presumably due to molybdenum.
Jun 16 1993 04:52:00:080PM	930616027	Robert Granetz	For the next shot (028): argon puff is back on and EF1's and EF2's are being raised again by 500 amps.
Jun 16 1993 10:48:11:520PM	930616027	Robert Granetz	Side UV array sees extra emission in the upper part of the plasma. Could be an upper diverted plasma?
Jun 16 1993 05:53:08:130PM	930616028	Robert Granetz	Another great shot. Side UV array sees extra emission in the upper part of the plasma. Could be an upper diverted plasma?
Jun 16 1993 10:31:20:580PM	930616028	Robert Granetz	There was an argon gas puff on this shot.
Jun 16 1993 10:29:12:830PM	930616029	Robert Granetz	Not quite as good a shot. Plasma disrupts earlier than it has been on recent shots...first disruption is at about 0.165 s, and plasma ends at about 0.20 s. This may have been due to excessive elongation due to the programming of the EF1's and EF2's, in an attempt to divert the plasma.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:04:37:280AM	Plasma	Ok	no tf ps in local mode
2	09:17:29:740AM	Plasma	Ok	PLASMA SHOT NO FAULTS
3	09:36:05:710AM	Plasma	Ok	OK PLASMA NOFAULTS
4	09:54:04:230AM	Plasma	Ok	PLASMA SHOT NO FAULTS
5	10:11:00:050AM	Plasma	Ok	PLASMA SHOT NO FAULTS
6	10:25:46:810AM	Plasma	Ok	PLASMA SHOT NO FAULTS
7	11:25:26:530AM	Test	Bad
8	11:28:13:070AM	Plasma	Ok	PLASMA SHOT NO FAULTS.
9	11:41:30:980AM	Plasma	Ok	PLASMA SHOT NO FAULTS.
10	11:58:01:010AM	Plasma	Ok	PLASMA SHOT NO FAULTS
11	12:14:42:930PM	Plasma	Ok	PLASMA SHOT NO FAULTS.
12	12:31:50:290PM	Plasma	Ok	PLASMA SHOT NO FAULTS.
13	12:51:20:150PM	Plasma	Ok	PLASMA
14	01:06:01:580PM	Plasma	Ok	PLASMA ECDC
15	01:28:56:700PM	Plasma	Ok	PLASMA
16	01:44:37:860PM	Plasma	Ok	NO FAULTS 320KA
17	01:59:12:580PM	Plasma	Ok	PLASMA SHOT NO FAULTS.
18	02:15:16:840PM	Plasma	Ok	PASMA SHOT NO FAULTS
19	02:33:17:880PM	Plasma	Ok	PLASMA SHOT NO FAULTS.
20	02:47:25:850PM	Plasma	Ok	PLASMA SHOT NO FAULTS.
21	03:02:52:920PM	Plasma	Ok	PLASMA -- NO FAULTS
22	03:16:43:280PM	Plasma	Ok	PLASMA SHOT NO FAULTS.
23	03:30:29:690PM	Plasma	Ok	PLASMA SHOT NO FAULTS.
24	03:52:33:230PM	Plasma	Ok	PLASMA SHOT NO FAULTS.
25	04:06:55:540PM	Plasma	Ok	PLASMA SHOT NO FAULTS.
26	04:20:49:570PM	Plasma	Ok	PLASNA SHOT NO FAULTS.
27	04:35:05:350PM	Plasma	Ok	PLASMA SHOT NO FAULTS.
28	04:49:03:170PM	Plasma	Ok	PLASMA SHOT NO FAULTS.