Alcator C-Mod Run 990922 Information

Miniproposals

Miniproposal: 232

Date Filed: 12/31/1998

Title: Mapping EDA/ELMfree Boundary

First Author: Martin Greenwald

Session Leader: Martin Greenwald (shots 1-25)

Operators
Session leader(s):	Martin Greenwald
Physics operator(s):	Ian Hutchinson
Engineering operator(s):	Unknown

Engineering Operator Run Comment
MP# 232/Hutch, Silva

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:21:460PM

Author: To Be Determined

Run Plan for 990922
mp 232 EDA/ELMfree

Session Leader - Greenwald
Phys Op - Hutch

============================

Plan:

Ip = 1.0 MA, Bt = 5.3 T, Prf = 2 - 2.5 (steady power is crucial)
target density ~ 1.5 x 10^20 (nl_04 ~ 1)

1. continuous scan both triangularities over full range
2. continuous scan lower triangularity (0.4-0.65)
3. continuous scan upper triangularity (0.15-0.75)

(if EDA/ELMfree transitions are not obtained in reasonable part of
the range, adjust Ip)

4. Pick most promising condition and scan both delta and Ip to hold
q95 constant

5. With normal shape, scan Ip slowly from about 0.8 to 1.2
(adjust ramp to get good EDA phase, slow transition, and reasonably
long ELMfree phase)

6. If time allows, scan kappa at Ip = 1.0, normal triangularity.

Special attention should be paid to new pedestal and fluctuation
diagnostics.

==============================

Results:

Moderate success at best. It wasn't possible to get steady RF power,
most of the time we had less than 1 MW. As a result, the H-modes were
marginal with frequent returns to L-Mode or type III ELMs. We did carry
out scans of average triangularity from 0.6 to 0.28 at several values of
q95 (Ip). Good pedestal data was taken with the new diagnostics and
fluctuation measurements were obtained during the transition time.

The pedestal widths from several diagnostics (edge soft x-rays, edge
Thomson, VB) varied directly with triangularity as did Halpha. (Look at
shot 09 and 24 for example) In many cases this was indicative of
transitions to ELMfree at low delta - though not in all cases.

We seem to have confirmed that low triangularity leads to ELMfree even
at q95 high enough to be EDA with our normal shape.

================================

Shots suitable for further analysis include:
990922003
990922004
990922006
990922007
990922008
990922009
990922010
990922014
990922015
990922017
990922020
990922021
990922023
990922024

Physics Operator Summaries

Entered: Jul 7 2004 04:37:09:350PM

Author: To Be Determined

Physop Summary for 990922
MP 323 Mapping ELMfree/EDA boundaries.
______________________________________

PO Hutch SL G.

Summary
_______

The run started with parapsychological analysis of the RF which caused
a rather slow start. Cell accesses were required for PCI. Later in the
day a problem where the ECE decided to close the TCI gate valve and
hence destroy the density feedback, and gas the plasma to death,
required another cell access. A worry on the TF scanner emerged
towards the end of the day. A few shots that approached double-null
showed big impurity injections.

Despite these annoying technical difficulties and unreliable RF,
useful data was obtained on triangularity dependence of EDA/ELMfree
behaviour. To the naked eye, there was no significant evidence of the
supposed optimum in triangularity, short of the maximum accessible,
for obtaining EDA. But there was a marked decrease in the the D-alpha
level as triangularity is decreased. Current was given a transient
increase to compensate for the change in shape and keep safety factor
approximately constant.

Data was obtained at 1MA, 0.8MA, 0.7MA, and 1.2MA, but not at as high
a power as we would like. So the results may be less than perfectly
clear.

Summary
_______

Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax
1 0.000 0.010 2 0.000 0.016
3 1.882 0.983 4 1.559 0.988
5 0.000 0.045 6 1.884 0.983
7 1.873 0.983 8 1.872 0.983
9 1.871 1.055 10 1.873 1.060
11 0.753 1.060 12 0.674 1.102
13 0.312 0.750 14 1.871 1.060
15 1.872 1.071 16 1.175 0.879
17 1.872 0.905 18 0.000 0.047
19 0.000 0.047 20 1.872 0.916
21 1.875 0.879 22 56.911 0.761
23 1.879 0.771 24 1.870 1.236
25 1.668 1.278
Finished summary for 990922 Total of 25 shots.
25 shots. 20 plasmas. 3 fizzles. 2 duds.

Details
________

990922xxx hutch PHYSICS_OPERATOR Sep 22 1999 8:50:03:966AM
. . . . . . . . . . . . . . . . . . . .
Cold start is Ok.
Import segment 2 from 990920017, load.
Import segment 2 from 980204040 to segment 3. Got lots of warnings about configuration.

Plan for scan:
Leave zxu alone. Seems ok.
RXU old scan goes from -.04 to +.03
zxl old is zero. New is -.005. That's probably ok.
rxl old scan is from -.025 to +.0325. So basically we can do equivalent scans by
simply installing a sweep in rxl and rxu.
----------------------------------------------------------------------------
990922xxx hutch PHYSICS_OPERATOR Sep 22 1999 9:22:58:950AM
. . . . . . . . . . . . . . . . . . . .
The shot we loaded from has rxl approximately +.06. I don't understand that.
The predictorscope show we have been obtaining approximately zero.
Therefore we seem to be running with a big offset that ought to have been
compensated.

No that is .006: 6mm not cm. Never mind!
Install a sweep from -.025 to +.03 on RXL.

So we now have a sweep from about .5s to 1.1s and back to zero at about
1.5s on both rxl and rxu.
----------------------------------------------------------------------------
990922001 hutch PHYSICS_OPERATOR Sep 22 1999 9:24:11:466AM
. . . . . . . . . . . . . . . . . . . .
Gas Bside upper, and OH test. OK.
----------------------------------------------------------------------------
990922002 hutch PHYSICS_OPERATOR Sep 22 1999 10:02:02:450AM
. . . . . . . . . . . . . . . . . . . .
There is some problem with transmitter 2, so we go ahead with only 1.

DUD: gas valves were all disabled for some reason. No fill.
Fields fair.

Reduced Br offset to zero from .0005
----------------------------------------------------------------------------
990922003 hutch PHYSICS_OPERATOR Sep 22 1999 10:06:47:233AM
. . . . . . . . . . . . . . . . . . . .
Plasma. TRiangluarity scan seems ok.
Some injections at about .5s. May be because of the nose interaction.
What looks like elm free but with periodic relaxations.

Increase the rxu maximum. Swing the triangularity back further.
----------------------------------------------------------------------------
990922004 hutch PHYSICS_OPERATOR Sep 22 1999 10:23:34:030AM
. . . . . . . . . . . . . . . . . . . .
Plasma. Disrupts because EF2L zeros out.

Ease off on the swing back at the end.
Raise EF4 limit to 10kA.
Lower zxu during the first 1s.
----------------------------------------------------------------------------
990922005 hutch PHYSICS_OPERATOR Sep 22 1999 10:41:54:233AM
. . . . . . . . . . . . . . . . . . . .
Fizzle. Br is a bit positive.
Cell access.

Notice a PCS error
Load at 22-Sep-1999 10:20:51.00
Open tree SCRATCH_DISK:[HUTCH] -1
Open tree done
\HYBRID::TOP.PCS.SEG_01:V_14
Unwinding answer is:
\HYBRID::TOP.PCS.SEG_01:V_14
% XMANAGER: Caught unexpected error from client application. Message
follows...
% READS: Input conversion error.
Caused by having an incorrect offset format =.
Had to crash pcs and restart.

Br offset to -.0005.
Raise gas V at 50ms to 100.
----------------------------------------------------------------------------
990922006 hutch PHYSICS_OPERATOR Sep 22 1999 11:23:32:356AM
. . . . . . . . . . . . . . . . . . . .
Start the triangularity sweep at rxl=0 then sweep in before sweeping out.
Plasma. Got some power out of transmitter 2, but tripped.

H puff to 30ms from 50ms.
Install another Bt scan at .75s.
----------------------------------------------------------------------------
990922007 hutch PHYSICS_OPERATOR Sep 22 1999 11:39:26:433AM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Push segment 1 gas some more.
zxu to .02 til .8s. rxu to -.05 there.
----------------------------------------------------------------------------
990922008 hutch PHYSICS_OPERATOR Sep 22 1999 12:00:38:686PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Triangularity is increased, as expected.

Intall a current ramp up/down to 1.1MA to compensate q variation.
Move rcur in by .5mm(!) Dwell slightly longer at the highest triangularity.
Increase the Bt tweak a tad.
----------------------------------------------------------------------------
990922009 hutch PHYSICS_OPERATOR Sep 22 1999 12:33:02:090PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Ef2s nearly zero during the current blip.

Tweak Rcur and clearin program to help the outer gap
during .5 to .8s.
----------------------------------------------------------------------------
990922010 hutch PHYSICS_OPERATOR Sep 22 1999 12:37:51:576PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Outer gap looks better.

Push Rcur a little more in for the left gap.
Lower zxu to 0 for greater upper triang.
Lower ICEF4 to try to avoid an ef2 zero.
----------------------------------------------------------------------------
990922011 hutch PHYSICS_OPERATOR Sep 22 1999 12:54:45:700PM
. . . . . . . . . . . . . . . . . . . .
Plasma disrupts at .75s. Serious radiation accumulation.
EF2U gets zeroed and won't come back on.
But the main problem is Mo injections.

zxu to 1cm. Don't go so double null.
Do more to EF4 to help on EF2.
----------------------------------------------------------------------------
990922012 hutch PHYSICS_OPERATOR Sep 22 1999 1:09:54:840PM
. . . . . . . . . . . . . . . . . . . .
Plasma Disrupts at a similar time. But EF2 is fine.
Another big injection.

zxu to 3cm
----------------------------------------------------------------------------
990922013 hutch PHYSICS_OPERATOR Sep 22 1999 1:21:35:373PM
. . . . . . . . . . . . . . . . . . . .
Plasma disrupts at .3s with terrible radiation.
Reported to be Mo.

Repeat, no changes.
----------------------------------------------------------------------------
990922014 hutch PHYSICS_OPERATOR Sep 22 1999 1:42:09:233PM
. . . . . . . . . . . . . . . . . . . .
Plasma. No disruption.

Ip upswing to 1.12MA from 1.1MA.
----------------------------------------------------------------------------
990922015 hutch PHYSICS_OPERATOR Sep 22 1999 2:00:26:920PM
. . . . . . . . . . . . . . . . . . . .
Plasma. RF stays on at about 1.5MW.

Go to .8MA nominal current.
----------------------------------------------------------------------------
990922016 hutch PHYSICS_OPERATOR Sep 22 1999 2:41:20:090PM
. . . . . . . . . . . . . . . . . . . .
Plasma disrupts at 1.17s
Interferometer dies and we get a giant gas puff throughout.
This is caused by a fault on ECE that tells the gate valves for it
and for TCI to close, prior to the shot.
Cell access to try to fix.
----------------------------------------------------------------------------
990922017 hutch PHYSICS_OPERATOR Sep 22 1999 2:58:30:560PM
. . . . . . . . . . . . . . . . . . . .
Plasma. 1.5MW RF till 1.s

Tweak current to flatten q
Tweak rcur for gap.
----------------------------------------------------------------------------
990922018 hutch PHYSICS_OPERATOR Sep 22 1999 3:11:06:186PM
. . . . . . . . . . . . . . . . . . . .
Fizzle. Late breakdown.

Fill puff to 23ms from 19.
----------------------------------------------------------------------------
990922019 hutch PHYSICS_OPERATOR Sep 22 1999 3:23:30:483PM
. . . . . . . . . . . . . . . . . . . .
Fizzle

Br to -.001T
----------------------------------------------------------------------------
990922020 hutch PHYSICS_OPERATOR Sep 22 1999 3:42:39:140PM
. . . . . . . . . . . . . . . . . . . .
Plasma. 1.5MW only to .84s

Tweak current and rcur for the RF gap.
ICEF4 to -1290 from -1285.
----------------------------------------------------------------------------
990922021 hutch PHYSICS_OPERATOR Sep 22 1999 4:19:31:576PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Ip to 700 kA.
Fill puff to 21ms.
Pause for examination of a scanner anomaly.
----------------------------------------------------------------------------
990922022 hutch PHYSICS_OPERATOR Sep 22 1999 4:35:34:670PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Falls out of H-mode at .8s. RF power only about .8MW.

No magnetics data. Actually the data is there, it is the timebase that is
screwed up.
----------------------------------------------------------------------------
990922023 hutch PHYSICS_OPERATOR Sep 22 1999 4:54:57:873PM
. . . . . . . . . . . . . . . . . . . .
Plasma. RF still trips. But a second H-mode is obtained.

Load segment 2 from shot 14.
Raise Ip to 1.2MA.
----------------------------------------------------------------------------
990922024 hutch PHYSICS_OPERATOR Sep 22 1999 5:07:21:293PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Only .8MW.

Tweak Ip and gap
Try for 1MW from one transmitter.
----------------------------------------------------------------------------
990922025 hutch PHYSICS_OPERATOR Sep 22 1999 5:23:57:296PM
. . . . . . . . . . . . . . . . . . . .
Plasma
Accumulates too much impurity. Reverts to L-mode and stays there.

Session Leader Comments

Sep 22 1999 09:03:19:890AM Martin Greenwald Run plan for MP 232 EDA/ELMfree boundaries
Special attention should be paid to new pedestal and fluctuation
diagnostics.

Ip = 1.0 MA, Bt = 5.3 T, Prf = 2 - 2.5 (steady power is crucial)
target density ~ 1.5 x 10^20 (nl_04 ~ 1)

1. continuous scan both triangularities over full range
2. continuous scan lower triangularity (0.4-0.65)
3. continuous scan upper triangularity (0.15-0.75)

(if EDA/ELMfree transitions are not obtained in reasonable part of
the range, adjust Ip)

4. Pick most promising condition and scan both delta and Ip to hold
q95 constant

5. With normal shape, scan Ip slowly from about 0.8 to 1.2
(adjust ramp to get good EDA phase, slow transition, and reasonably
long ELMfree phase)

6. If time allows, scan kappa at Ip = 1.0, normal triangularity.

7. If lightning strikes and we accomplish all this. Repeat as much
of 1-3 with lower density.

Sep 22 1999 10:03:30:373AM 990922003 Martin Greenwald First plasma
Only 1 RF transmitter ~ 1 MW
numerous H-modes
Some modulation of EDAness with triangularity

Sep 22 1999 10:17:35:733AM 990922004 Martin Greenwald Similar to shot 003
slightly lower triangularity at bottom of sweep

Sep 22 1999 10:31:43:717AM 990922005 Martin Greenwald fizzle

Sep 22 1999 11:43:17:547AM 990922006 Martin Greenwald 2nd transmitter beginning to work
many h-mode phases
roughly same triangularity range 0.55 - 0.28

Sep 22 1999 11:41:16:107AM 990922007 Martin Greenwald Many H-mode phases

Second transmitter available for .5 sec - Prf reaches 1.8
but with many faults

Sep 22 1999 11:59:13:810AM 990922008 Martin Greenwald slightly more upper triangularity
delta av reaches 0.6

E port still trips out early

Most Pedestal widths modulated by triangularity

Sep 22 1999 12:09:17:450PM 990922009 Martin Greenwald Ip corrected slightly to keep q95 more constant
otherwise similar to shot 008

Sep 22 1999 12:27:56:797PM 990922010 Martin Greenwald E port antenna stays on a bit longer
otherwise similar to previous shots

Sep 22 1999 12:45:19:420PM 990922011 Martin Greenwald much higher upper triangularity 0.77
(moderately double null)
goes decisively ELMfree and disrupts shortly after

Sep 22 1999 01:26:31:123PM 990922012 Martin Greenwald disrupts

Sep 22 1999 01:26:15:937PM 990922013 Martin Greenwald disrupts very early

Sep 22 1999 01:39:16:047PM 990922014 Martin Greenwald backed off on upper triangularity
H-modes unstable

Sep 22 1999 02:02:26:797PM 990922015 Martin Greenwald RF demand lowered - both systems stayed on through the shot

Sep 22 1999 02:32:49:967PM 990922016 Martin Greenwald Density feedback failed
No H-mode but a density limit disruption

Sep 22 1999 02:59:02:683PM 990922017 Martin Greenwald Lower Ip to 0.8 MA with same triangularity scan
D antenna trips at 1.05 sec - H-mode lost
no indication of ELMfree to that point (delta ~ 0.35)

Sep 22 1999 02:59:12:513PM 990922018 Martin Greenwald
fizzle

Sep 22 1999 03:31:16:420PM 990922020 Martin Greenwald D port antenna trips early
Stays in H-mode
ELMfree like after 1 sec

Sep 22 1999 03:51:28:623PM 990922021 Martin Greenwald slightly better RF pulse, still lost D at 1.05 sec
EF appears at bottom of delta scan

Sep 22 1999 04:34:45:420PM 990922022 Martin Greenwald D port antenna trips after a 60 msec leaving only .7 MW
H-mode lost at 0.8 sec before triangularity scan gets very far

Magnetics timing is screwed up (Ip begins at 55 sec)
so no EFIT

Sep 22 1999 04:54:22:343PM 990922023 Martin Greenwald D port antenna trips again, but we regain the H-mode
Might be an elmfree period at bottom of delta scan

Sep 22 1999 05:02:00:530PM 990922024 Martin Greenwald 1.2 MA, RF power only 0.6 MW (Much less than ohmic power)
Mostly ELMfree

Sep 22 1999 05:24:43:110PM 990922025 Martin Greenwald RF for only about 0.4 sec
H-modes lost for good at 0.95 sec

Physics Operator Comments

Sep 22 1999 08:50:03:967AM Ian Hutchinson Cold start is Ok.
Import segment 2 from 990920017, load.
Import segment 2 from 980204040 to segment 3. Got lots of warnings about configuration.

Plan for scan:
Leave zxu alone. Seems ok.
RXU old scan goes from -.04 to +.03
zxl old is zero. New is -.005. That's probably ok.
rxl old scan is from -.025 to +.0325. So basically we can do equivalent scans by
simply installing a sweep in rxl and rxu.

Sep 22 1999 09:22:58:950AM Ian Hutchinson The shot we loaded from has rxl approximately +.06. I don't understand that.
The predictorscope show we have been obtaining approximately zero.
Therefore we seem to be running with a big offset that ought to have been
compensated.

No that is .006: 6mm not cm. Never mind!
Install a sweep from -.025 to +.03 on RXL.

So we now have a sweep from about .5s to 1.1s and back to zero at about
1.5s on both rxl and rxu.

Sep 22 1999 09:24:11:467AM 990922001 Ian Hutchinson Gas Bside upper, and OH test. OK.

Sep 22 1999 10:02:02:450AM 990922002 Ian Hutchinson There is some problem with transmitter 2, so we go ahead with only 1.

DUD: gas valves were all disabled for some reason. No fill.
Fields fair.

Reduced Br offset to zero from .0005

Sep 22 1999 10:06:47:233AM 990922003 Ian Hutchinson Plasma. TRiangluarity scan seems ok.
Some injections at about .5s. May be because of the nose interaction.
What looks like elm free but with periodic relaxations.

Increase the rxu maximum. Swing the triangularity back further.

Sep 22 1999 10:23:34:030AM 990922004 Ian Hutchinson Plasma. Disrupts because EF2L zeros out.

Ease off on the swing back at the end.
Raise EF4 limit to 10kA.
Lower zxu during the first 1s.

Sep 22 1999 10:41:54:233AM 990922005 Ian Hutchinson Fizzle. Br is a bit positive.
Cell access.

Notice a PCS error
Load at 22-Sep-1999 10:20:51.00
Open tree SCRATCH_DISK:[HUTCH] -1
Open tree done
\HYBRID::TOP.PCS.SEG_01:V_14
Unwinding answer is:
\HYBRID::TOP.PCS.SEG_01:V_14
% XMANAGER: Caught unexpected error from client application. Message
follows...
% READS: Input conversion error.
Caused by having an incorrect offset format =.
Had to crash pcs and restart.

Br offset to -.0005.
Raise gas V at 50ms to 100.

Sep 22 1999 11:23:32:357AM 990922006 Ian Hutchinson Start the triangularity sweep at rxl=0 then sweep in before sweeping out.
Plasma. Got some power out of transmitter 2, but tripped.

H puff to 30ms from 50ms.
Install another Bt scan at .75s.

Sep 22 1999 11:39:26:433AM 990922007 Ian Hutchinson Plasma.

Push segment 1 gas some more.
zxu to .02 til .8s. rxu to -.05 there.

Sep 22 1999 12:00:38:687PM 990922008 Ian Hutchinson Plasma. Triangularity is increased, as expected.

Intall a current ramp up/down to 1.1MA to compensate q variation.
Move rcur in by .5mm(!) Dwell slightly longer at the highest triangularity.
Increase the Bt tweak a tad.

Sep 22 1999 12:33:02:090PM 990922009 Ian Hutchinson Plasma. Ef2s nearly zero during the current blip.

Tweak Rcur and clearin program to help the outer gap
during .5 to .8s.

Sep 22 1999 12:37:51:577PM 990922010 Ian Hutchinson Plasma. Outer gap looks better.

Push Rcur a little more in for the left gap.
Lower zxu to 0 for greater upper triang.
Lower ICEF4 to try to avoid an ef2 zero.

Sep 22 1999 12:54:45:700PM 990922011 Ian Hutchinson Plasma disrupts at .75s. Serious radiation accumulation.
EF2U gets zeroed and won't come back on.
But the main problem is Mo injections.

zxu to 1cm. Don't go so double null.
Do more to EF4 to help on EF2.

Sep 22 1999 01:09:54:840PM 990922012 Ian Hutchinson Plasma Disrupts at a similar time. But EF2 is fine.
Another big injection.

zxu to 3cm

Sep 22 1999 01:21:35:373PM 990922013 Ian Hutchinson Plasma disrupts at .3s with terrible radiation.
Reported to be Mo.

Repeat, no changes.

Sep 22 1999 01:42:09:233PM 990922014 Ian Hutchinson Plasma. No disruption.

Ip upswing to 1.12MA from 1.1MA.

Sep 22 1999 02:00:26:920PM 990922015 Ian Hutchinson Plasma. RF stays on at about 1.5MW.

Go to .8MA nominal current.

Sep 22 1999 02:41:20:090PM 990922016 Ian Hutchinson Plasma disrupts at 1.17s
Interferometer dies and we get a giant gas puff throughout.
This is caused by a fault on ECE that tells the gate valves for it
and for TCI to close, prior to the shot.
Cell access to try to fix.

Sep 22 1999 02:58:30:560PM 990922017 Ian Hutchinson Plasma. 1.5MW RF till 1.s

Tweak current to flatten q
Tweak rcur for gap.

Sep 22 1999 03:11:06:187PM 990922018 Ian Hutchinson Fizzle. Late breakdown.

Fill puff to 23ms from 19.

Sep 22 1999 03:23:30:483PM 990922019 Ian Hutchinson Fizzle

Br to -.001T

Sep 22 1999 03:42:39:140PM 990922020 Ian Hutchinson Plasma. 1.5MW only to .84s

Tweak current and rcur for the RF gap.
ICEF4 to -1290 from -1285.

Sep 22 1999 04:19:31:577PM 990922021 Ian Hutchinson Plasma.

Ip to 700 kA.
Fill puff to 21ms.
Pause for examination of a scanner anomaly.

Sep 22 1999 04:35:34:670PM 990922022 Ian Hutchinson Plasma. Falls out of H-mode at .8s. RF power only about .8MW.

No magnetics data. Actually the data is there, it is the timebase that is
screwed up.

Sep 22 1999 04:54:57:873PM 990922023 Ian Hutchinson Plasma. RF still trips. But a second H-mode is obtained.

Load segment 2 from shot 14.
Raise Ip to 1.2MA.

Sep 22 1999 05:07:21:293PM 990922024 Ian Hutchinson Plasma. Only .8MW.

Tweak Ip and gap
Try for 1MW from one transmitter.

Sep 22 1999 05:23:57:297PM 990922025 Ian Hutchinson Plasma
Accumulates too much impurity. Reverts to L-mode and stays there.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:06:14:123AM Test Ok (null)

2 09:37:03:780AM Plasma Bad No Gas

3 09:48:52:233AM Plasma Ok (null)

4 10:06:49:653AM Plasma Ok (null)

5 10:28:02:793AM Plasma Ok (null)

6 11:03:33:840AM Plasma Ok (null)

7 11:22:33:967AM Plasma Ok (null)

8 11:40:25:950AM Plasma Ok (null)

9 12:00:09:590PM Plasma Ok (null)

10 12:18:25:420PM Plasma Ok (null)

11 12:36:18:297PM Plasma Ok (null)

12 12:54:14:670PM Plasma Ok (null)

13 01:08:21:560PM Plasma Ok (null)

14 01:22:43:107PM Plasma Ok (null)

15 01:40:39:903PM Plasma Ok (null)

16 01:57:41:297PM Plasma Ok (null)

17 02:39:23:403PM Plasma Ok (null)

18 02:56:06:623PM Plasma Ok (null)

19 03:09:04:047PM Plasma Ok (null)

20 03:22:03:327PM Plasma Ok (null)

21 03:40:04:060PM Plasma Ok (null)

22 04:16:31:107PM Plasma Ok (null)

23 04:33:27:903PM Plasma Ok (null)

24 04:49:24:843PM Plasma Ok (null)

25 05:20:35:090PM Plasma Ok (null)

Session Leader Comments
Sep 22 1999 09:03:19:890AM		Martin Greenwald	Run plan for MP 232 EDA/ELMfree boundaries Special attention should be paid to new pedestal and fluctuation diagnostics. Ip = 1.0 MA, Bt = 5.3 T, Prf = 2 - 2.5 (steady power is crucial) target density ~ 1.5 x 10^20 (nl_04 ~ 1) 1. continuous scan both triangularities over full range 2. continuous scan lower triangularity (0.4-0.65) 3. continuous scan upper triangularity (0.15-0.75) (if EDA/ELMfree transitions are not obtained in reasonable part of the range, adjust Ip) 4. Pick most promising condition and scan both delta and Ip to hold q95 constant 5. With normal shape, scan Ip slowly from about 0.8 to 1.2 (adjust ramp to get good EDA phase, slow transition, and reasonably long ELMfree phase) 6. If time allows, scan kappa at Ip = 1.0, normal triangularity. 7. If lightning strikes and we accomplish all this. Repeat as much of 1-3 with lower density.
Sep 22 1999 10:03:30:373AM	990922003	Martin Greenwald	First plasma Only 1 RF transmitter ~ 1 MW numerous H-modes Some modulation of EDAness with triangularity
Sep 22 1999 10:17:35:733AM	990922004	Martin Greenwald	Similar to shot 003 slightly lower triangularity at bottom of sweep
Sep 22 1999 10:31:43:717AM	990922005	Martin Greenwald	fizzle
Sep 22 1999 11:43:17:547AM	990922006	Martin Greenwald	2nd transmitter beginning to work many h-mode phases roughly same triangularity range 0.55 - 0.28
Sep 22 1999 11:41:16:107AM	990922007	Martin Greenwald	Many H-mode phases Second transmitter available for .5 sec - Prf reaches 1.8 but with many faults
Sep 22 1999 11:59:13:810AM	990922008	Martin Greenwald	slightly more upper triangularity delta av reaches 0.6 E port still trips out early Most Pedestal widths modulated by triangularity
Sep 22 1999 12:09:17:450PM	990922009	Martin Greenwald	Ip corrected slightly to keep q95 more constant otherwise similar to shot 008
Sep 22 1999 12:27:56:797PM	990922010	Martin Greenwald	E port antenna stays on a bit longer otherwise similar to previous shots
Sep 22 1999 12:45:19:420PM	990922011	Martin Greenwald	much higher upper triangularity 0.77 (moderately double null) goes decisively ELMfree and disrupts shortly after
Sep 22 1999 01:26:31:123PM	990922012	Martin Greenwald	disrupts
Sep 22 1999 01:26:15:937PM	990922013	Martin Greenwald	disrupts very early
Sep 22 1999 01:39:16:047PM	990922014	Martin Greenwald	backed off on upper triangularity H-modes unstable
Sep 22 1999 02:02:26:797PM	990922015	Martin Greenwald	RF demand lowered - both systems stayed on through the shot
Sep 22 1999 02:32:49:967PM	990922016	Martin Greenwald	Density feedback failed No H-mode but a density limit disruption
Sep 22 1999 02:59:02:683PM	990922017	Martin Greenwald	Lower Ip to 0.8 MA with same triangularity scan D antenna trips at 1.05 sec - H-mode lost no indication of ELMfree to that point (delta ~ 0.35)
Sep 22 1999 02:59:12:513PM	990922018	Martin Greenwald	fizzle
Sep 22 1999 03:31:16:420PM	990922020	Martin Greenwald	D port antenna trips early Stays in H-mode ELMfree like after 1 sec
Sep 22 1999 03:51:28:623PM	990922021	Martin Greenwald	slightly better RF pulse, still lost D at 1.05 sec EF appears at bottom of delta scan
Sep 22 1999 04:34:45:420PM	990922022	Martin Greenwald	D port antenna trips after a 60 msec leaving only .7 MW H-mode lost at 0.8 sec before triangularity scan gets very far Magnetics timing is screwed up (Ip begins at 55 sec) so no EFIT
Sep 22 1999 04:54:22:343PM	990922023	Martin Greenwald	D port antenna trips again, but we regain the H-mode Might be an elmfree period at bottom of delta scan
Sep 22 1999 05:02:00:530PM	990922024	Martin Greenwald	1.2 MA, RF power only 0.6 MW (Much less than ohmic power) Mostly ELMfree
Sep 22 1999 05:24:43:110PM	990922025	Martin Greenwald	RF for only about 0.4 sec H-modes lost for good at 0.95 sec

Physics Operator Comments
Sep 22 1999 08:50:03:967AM		Ian Hutchinson	Cold start is Ok. Import segment 2 from 990920017, load. Import segment 2 from 980204040 to segment 3. Got lots of warnings about configuration. Plan for scan: Leave zxu alone. Seems ok. RXU old scan goes from -.04 to +.03 zxl old is zero. New is -.005. That's probably ok. rxl old scan is from -.025 to +.0325. So basically we can do equivalent scans by simply installing a sweep in rxl and rxu.
Sep 22 1999 09:22:58:950AM		Ian Hutchinson	The shot we loaded from has rxl approximately +.06. I don't understand that. The predictorscope show we have been obtaining approximately zero. Therefore we seem to be running with a big offset that ought to have been compensated. No that is .006: 6mm not cm. Never mind! Install a sweep from -.025 to +.03 on RXL. So we now have a sweep from about .5s to 1.1s and back to zero at about 1.5s on both rxl and rxu.
Sep 22 1999 09:24:11:467AM	990922001	Ian Hutchinson	Gas Bside upper, and OH test. OK.
Sep 22 1999 10:02:02:450AM	990922002	Ian Hutchinson	There is some problem with transmitter 2, so we go ahead with only 1. DUD: gas valves were all disabled for some reason. No fill. Fields fair. Reduced Br offset to zero from .0005
Sep 22 1999 10:06:47:233AM	990922003	Ian Hutchinson	Plasma. TRiangluarity scan seems ok. Some injections at about .5s. May be because of the nose interaction. What looks like elm free but with periodic relaxations. Increase the rxu maximum. Swing the triangularity back further.
Sep 22 1999 10:23:34:030AM	990922004	Ian Hutchinson	Plasma. Disrupts because EF2L zeros out. Ease off on the swing back at the end. Raise EF4 limit to 10kA. Lower zxu during the first 1s.
Sep 22 1999 10:41:54:233AM	990922005	Ian Hutchinson	Fizzle. Br is a bit positive. Cell access. Notice a PCS error Load at 22-Sep-1999 10:20:51.00 Open tree SCRATCH_DISK:[HUTCH] -1 Open tree done \HYBRID::TOP.PCS.SEG_01:V_14 Unwinding answer is: \HYBRID::TOP.PCS.SEG_01:V_14 % XMANAGER: Caught unexpected error from client application. Message follows... % READS: Input conversion error. Caused by having an incorrect offset format =. Had to crash pcs and restart. Br offset to -.0005. Raise gas V at 50ms to 100.
Sep 22 1999 11:23:32:357AM	990922006	Ian Hutchinson	Start the triangularity sweep at rxl=0 then sweep in before sweeping out. Plasma. Got some power out of transmitter 2, but tripped. H puff to 30ms from 50ms. Install another Bt scan at .75s.
Sep 22 1999 11:39:26:433AM	990922007	Ian Hutchinson	Plasma. Push segment 1 gas some more. zxu to .02 til .8s. rxu to -.05 there.
Sep 22 1999 12:00:38:687PM	990922008	Ian Hutchinson	Plasma. Triangularity is increased, as expected. Intall a current ramp up/down to 1.1MA to compensate q variation. Move rcur in by .5mm(!) Dwell slightly longer at the highest triangularity. Increase the Bt tweak a tad.
Sep 22 1999 12:33:02:090PM	990922009	Ian Hutchinson	Plasma. Ef2s nearly zero during the current blip. Tweak Rcur and clearin program to help the outer gap during .5 to .8s.
Sep 22 1999 12:37:51:577PM	990922010	Ian Hutchinson	Plasma. Outer gap looks better. Push Rcur a little more in for the left gap. Lower zxu to 0 for greater upper triang. Lower ICEF4 to try to avoid an ef2 zero.
Sep 22 1999 12:54:45:700PM	990922011	Ian Hutchinson	Plasma disrupts at .75s. Serious radiation accumulation. EF2U gets zeroed and won't come back on. But the main problem is Mo injections. zxu to 1cm. Don't go so double null. Do more to EF4 to help on EF2.
Sep 22 1999 01:09:54:840PM	990922012	Ian Hutchinson	Plasma Disrupts at a similar time. But EF2 is fine. Another big injection. zxu to 3cm
Sep 22 1999 01:21:35:373PM	990922013	Ian Hutchinson	Plasma disrupts at .3s with terrible radiation. Reported to be Mo. Repeat, no changes.
Sep 22 1999 01:42:09:233PM	990922014	Ian Hutchinson	Plasma. No disruption. Ip upswing to 1.12MA from 1.1MA.
Sep 22 1999 02:00:26:920PM	990922015	Ian Hutchinson	Plasma. RF stays on at about 1.5MW. Go to .8MA nominal current.
Sep 22 1999 02:41:20:090PM	990922016	Ian Hutchinson	Plasma disrupts at 1.17s Interferometer dies and we get a giant gas puff throughout. This is caused by a fault on ECE that tells the gate valves for it and for TCI to close, prior to the shot. Cell access to try to fix.
Sep 22 1999 02:58:30:560PM	990922017	Ian Hutchinson	Plasma. 1.5MW RF till 1.s Tweak current to flatten q Tweak rcur for gap.
Sep 22 1999 03:11:06:187PM	990922018	Ian Hutchinson	Fizzle. Late breakdown. Fill puff to 23ms from 19.
Sep 22 1999 03:23:30:483PM	990922019	Ian Hutchinson	Fizzle Br to -.001T
Sep 22 1999 03:42:39:140PM	990922020	Ian Hutchinson	Plasma. 1.5MW only to .84s Tweak current and rcur for the RF gap. ICEF4 to -1290 from -1285.
Sep 22 1999 04:19:31:577PM	990922021	Ian Hutchinson	Plasma. Ip to 700 kA. Fill puff to 21ms. Pause for examination of a scanner anomaly.
Sep 22 1999 04:35:34:670PM	990922022	Ian Hutchinson	Plasma. Falls out of H-mode at .8s. RF power only about .8MW. No magnetics data. Actually the data is there, it is the timebase that is screwed up.
Sep 22 1999 04:54:57:873PM	990922023	Ian Hutchinson	Plasma. RF still trips. But a second H-mode is obtained. Load segment 2 from shot 14. Raise Ip to 1.2MA.
Sep 22 1999 05:07:21:293PM	990922024	Ian Hutchinson	Plasma. Only .8MW. Tweak Ip and gap Try for 1MW from one transmitter.
Sep 22 1999 05:23:57:297PM	990922025	Ian Hutchinson	Plasma Accumulates too much impurity. Reverts to L-mode and stays there.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:06:14:123AM	Test	Ok	(null)
2	09:37:03:780AM	Plasma	Bad	No Gas
3	09:48:52:233AM	Plasma	Ok	(null)
4	10:06:49:653AM	Plasma	Ok	(null)
5	10:28:02:793AM	Plasma	Ok	(null)
6	11:03:33:840AM	Plasma	Ok	(null)
7	11:22:33:967AM	Plasma	Ok	(null)
8	11:40:25:950AM	Plasma	Ok	(null)
9	12:00:09:590PM	Plasma	Ok	(null)
10	12:18:25:420PM	Plasma	Ok	(null)
11	12:36:18:297PM	Plasma	Ok	(null)
12	12:54:14:670PM	Plasma	Ok	(null)
13	01:08:21:560PM	Plasma	Ok	(null)
14	01:22:43:107PM	Plasma	Ok	(null)
15	01:40:39:903PM	Plasma	Ok	(null)
16	01:57:41:297PM	Plasma	Ok	(null)
17	02:39:23:403PM	Plasma	Ok	(null)
18	02:56:06:623PM	Plasma	Ok	(null)
19	03:09:04:047PM	Plasma	Ok	(null)
20	03:22:03:327PM	Plasma	Ok	(null)
21	03:40:04:060PM	Plasma	Ok	(null)
22	04:16:31:107PM	Plasma	Ok	(null)
23	04:33:27:903PM	Plasma	Ok	(null)
24	04:49:24:843PM	Plasma	Ok	(null)
25	05:20:35:090PM	Plasma	Ok	(null)