Alcator C-Mod Run 990211 Information

Miniproposals

Miniproposal: 206

Date Filed: 12/31/1998

Title: Restart Operation: January 1999

First Author: Steve Wolfe

Session Leader: Steve Wolfe (shots 1-30)

Miniproposal: 211

Date Filed: 1/4/1999

Title: Constant shots to calibrate McPherson and HIREX Spectrometers

First Author: Jim Terry

Session Leader: Steve Wolfe (shots 1-30)

Miniproposal: 214

Date Filed: 1/5/1999

Title: D and E-port RF System Commissioning

First Author: Steve Wukitch

Session Leader: Steve Wolfe (shots 1-30)

Operators
Session leader(s):	Steve Wolfe,Steve Wolfe,Steve Wolfe
Physics operator(s):	Ian Hutchinson,Steve Wolfe
Engineering operator(s):	Gary Dekow,Frank Silva

Engineering Operator Run Comment
MP206/214 Hutch

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:19:133PM

Author: To Be Determined

Run Summary for Thurs 990211

MP 206 Restart Operation
214 ICRF conditioning
211 VUV calibration
SL: wolfe
PO: Hutch Asst. PO:Parker
EO: Silva/Dekow

Since we haven't boronized yet, this run was mainly icrf conditioning,
and a little VUV calibration left over from Tuesday. RF had problems with
the modulator and gain on transmitter #1, but eventually got some shots
with over 2MW total. VUV calibration was completed except for a Carbon line
with poor statistics.

Ian set up a startup with high pressure (20psi) in B-top, for use when we may
need additional puffer valves in segment 2. This seemed to work, with a pulse
length of 6msec.

We had several brief H-modes, which tripped the RF out. Threshold is somewhere
between 1 and 2MW. The signal from the RF loading feedback circuit is screwed
up and NOT ready for use.

H/D started the day at less than .1, and ended up over .2 at the end of the
RF.

The last two shots, at reduced density, ramped all the way down, the last to
1.83sec.

Startup was not quite as robust today as recently; there were two early
fizzles, and one late in the day. Final stats were 25/30 with two tests and
three fizzles.

Boronization will be run tonight. More fun and games tomorrow.

Physics Operator Summaries

Entered: Jul 7 2004 04:37:00:067PM

Author: To Be Determined

Physop Summary 990211

PO hutch

MP 206, 214 Startup and RF conditioning.

Accomplished:
____________

1. Got reliable gas fill with 20 psi D2 pressure in the prefill
valve. Pulse gas 4, B-top appears to have little or no delay opening.
6ms puff is about right for .07mTorr, and 1ms step gives about .015mTorr
difference. Pulse is at -1sec now, to ensure correct reading.
Recommend that 990211030 segment 1 be used for future plasmas.

2. Completed some reproducible shots for JT.

3. RF conditioning. Transmitter 2 seems to be working reliably (but perhaps
not heating all that well). H/D was about 0.1 today. Transmitter 1 had
many electronic problems and does not seem to be reliable.

4. Several H-modes were obtained with target densities in the region of
1e20 nl04, at a threshold in the region of 2MW.

5. Showed some suspicious correlation between disruptions and Argon.

6. Obtained a ramp-down practically all the way, with Ar off and nl04 set
at .9e20.

7. Observed many impurity injections. These may or may not have been caused
by the RF, but the disruptivity was fairly bad today.

Scorecard
_________

Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax
1 0.000 0.005 2 0.000 0.005
3 0.000 0.037 4 0.402 0.817
5 0.000 0.037 6 1.475 0.833
7 1.508 0.833 8 1.519 0.833
9 0.520 0.874 10 0.473 0.885
11 1.590 0.833 12 1.393 0.841
13 1.522 0.833 14 1.529 0.833
15 1.487 0.838 16 1.532 0.838
17 0.873 0.843 18 0.913 0.864
19 1.576 0.843 20 1.545 0.838
21 0.567 0.905 22 1.612 0.854
23 0.826 0.859 24 0.885 0.874
25 1.175 0.864 26 1.641 0.843
27 0.000 0.039 28 0.968 0.869
29 1.722 0.848 30 1.830 0.848

Finished summary for 990211 Total of 30 shots.
30 shots. 25 plasmas. 3 fizzles. 2 tests.
Fizzle = gt 27.0 lt 50kA.

Details
_______

990211xxx HUTCH PHYSICS_OPERATOR Feb 11 1999 8:25:33:280AM
. . . . . . . . . . . . . . . . . . . .
MP 206 Restart, and 214 RF commissioning.

Physop Hutch.

Got an error with cold start:

coldstart
set tree cmod
%SYSTEM-F-NOLOGNAM, no logical name match \REMCAM
So did:
USER10:[HUTCH]$ ccl remcam
Loading CTS definitions from remote node DAQA
Loading CTS definitions from remote node DAQ4
Loading CTS definitions from remote node DAQ2

Then coldstart runs:
wrap set
rtnode -- data loaded, A matrix responds
rtnode -- data loaded, M matrix responds
rtnode -- data loaded, PID matrix responds
RT_NODE Done
--------------------------------------------------------------------------------
990211xxx HUTCH PHYSICS_OPERATOR Feb 11 1999 9:03:45:140AM
. . . . . . . . . . . . . . . . . . . .
Pulse gas from yesterday was 17ms ending at -.5s.

Change that to 10ms at time -1.s. Pulse gas 4, B-top.
Also fixed the incorrect z position in ramp down.
Shorten the ARgon puff from 40 to 20 ms.
--------------------------------------------------------------------------------
990211001 HUTCH PHYSICS_OPERATOR Feb 11 1999 9:09:17:590AM
. . . . . . . . . . . . . . . . . . . .
Got too much pressure. Nearly 0.12mtorr.

Reduce puff length to 7ms.
--------------------------------------------------------------------------------
990211002 HUTCH PHYSICS_OPERATOR Feb 11 1999 9:20:40:000AM
. . . . . . . . . . . . . . . . . . . .
Test gives .08 mtorr.
--------------------------------------------------------------------------------
990211003 HUTCH PHYSICS_OPERATOR Feb 11 1999 9:22:43:483AM
. . . . . . . . . . . . . . . . . . . .
Fizzle.
CII is high, but the null is not too bad. Breakdown at 6ms

Fill puff to 6ms from 7ms.
--------------------------------------------------------------------------------
990211004 HUTCH PHYSICS_OPERATOR Feb 11 1999 9:34:25:826AM
. . . . . . . . . . . . . . . . . . . .
Plasma. Hit by a brick at .35s.
Got initial pressure .067mtorr.

No changes.
--------------------------------------------------------------------------------
990211005 HUTCH PHYSICS_OPERATOR Feb 11 1999 9:51:57:013AM
. . . . . . . . . . . . . . . . . . . .
Fizzle. Breakdown slightly later.
Fill pressure is exactly right and reproducible.

Lower br offset from 3.5 to 3.0 mT.
--------------------------------------------------------------------------------
990211006 HUTCH PHYSICS_OPERATOR Feb 11 1999 10:11:59:030AM
. . . . . . . . . . . . . . . . . . . .
Plasma, to 1.45s.
Substantial hesitation from 15 to 20ms.
Got some RF power, but no trace. Also camac error on the probes.

No changes
--------------------------------------------------------------------------------
990211007 HUTCH PHYSICS_OPERATOR Feb 11 1999 10:35:56:403AM
. . . . . . . . . . . . . . . . . . . .
Plasma. 1MW RF. Some heating.

Tweak OH1 voltage down from 80V to 40V at 15ms.
--------------------------------------------------------------------------------
990211008 HUTCH PHYSICS_OPERATOR Feb 11 1999 11:00:44:280AM
. . . . . . . . . . . . . . . . . . . .
Plasma. Got RF but camac errors again.
Cell access for TS. Power room access for RF.

In segment 2 insert programmed voltages on EF1 100V, and OH2 20V.
These are supposed to help the power supplies follow the demand better
during the shot, so the feedback does not have to work so hard.
This ought to get us a zxl/zxu nearer to what we are asking for.
--------------------------------------------------------------------------------
990211009 HUTCH PHYSICS_OPERATOR Feb 11 1999 11:19:22:826AM
. . . . . . . . . . . . . . . . . . . .
Plasma. Brick at .35s then it nearly recovers, but a big density rise
to 4e20(!) and then disrupts.

No changes.
--------------------------------------------------------------------------------
990211010 HUTCH PHYSICS_OPERATOR Feb 11 1999 11:33:23:606AM
. . . . . . . . . . . . . . . . . . . .
Plasma. Disrupts at .46s. Very similar to previous shot.
Some big marfe event, or gas puff happens starting at .35s.
Initiation was rather bad this shot. Bz was somewhat higher.

Reduced the OH2 to 5 volts in this regoin of the plasma program.
Perhaps those voltage tweaks subtly changed the shape.
--------------------------------------------------------------------------------
990211011 HUTCH PHYSICS_OPERATOR Feb 11 1999 11:46:44:326AM
. . . . . . . . . . . . . . . . . . . .
Plasma. RF tripping and retrying.

Move the rcur switched offset to 1.4s from 1.6 s.
RXL to 0 from .006m
--------------------------------------------------------------------------------
990211012 HUTCH PHYSICS_OPERATOR Feb 11 1999 1:09:17:450PM
. . . . . . . . . . . . . . . . . . . .
Plasma to 1.4s
--------------------------------------------------------------------------------
990211013 WOLFE PHYSICS_OPERATOR Feb 11 1999 12:13:10:950PM
. . . . . . . . . . . . . . . . . . . .
shot 13: Wolfe taking over as PHYSOP while Ian is away; I killed his PCS session and am using my own.
Add some Ar for JR (to 30msec).
Change RXL program to ramp from .006 at .45 to 0 at 1.2sec
The disruption came before the RCUR change Ian made, so ...

plasma to 1.51 sec, no rf. strike is better, still a bit high at the end.
Try increasing the RXL sweep.

--------------------------------------------------------------------------------
990211014 WOLFE PHYSICS_OPERATOR Feb 11 1999 12:35:34:340PM
. . . . . . . . . . . . . . . . . . . .
shot 14: Move RXL to -.005 at t=1.2sec
plasma to 1.52sec, RXL does what I ask. It's on the floor a bit early, but JT is happy so
leave it alone.

See about the rampdown.
--------------------------------------------------------------------------------
990211015 WOLFE PHYSICS_OPERATOR Feb 11 1999 12:58:28:293PM
. . . . . . . . . . . . . . . . . . . .
shot 15: ZXL is ramping from -.015 to .032 between 1.2 and 1.51sec; slow that down
to go to +.01 at 1.51sec (about half as much motion)
plasma to 1.48sec. Still no RF
--------------------------------------------------------------------------------
990211015 WOLFE PHYSICS_OPERATOR Feb 11 1999 1:05:20:403PM
. . . . . . . . . . . . . . . . . . . .
shot 16: Change the ZXL ramp in rampdown the other way: +.04 at 1.5sec, .06 at 1.8sec
--------------------------------------------------------------------------------
990211015 HUTCH PHYSICS_OPERATOR Feb 11 1999 1:08:09:373PM
. . . . . . . . . . . . . . . . . . . .
Plasma to 1.45s.
--------------------------------------------------------------------------------
990211016 HUTCH PHYSICS_OPERATOR Feb 11 1999 1:29:21:123PM
. . . . . . . . . . . . . . . . . . . .
Plasma to 1.53s.

rcur offset switch moved to 1.2s.
Ramp EF4 down more quickly in the ramp-down to help EF2
--------------------------------------------------------------------------------
990211017 HUTCH PHYSICS_OPERATOR Feb 11 1999 1:45:21:560PM
. . . . . . . . . . . . . . . . . . . .
Plasma disrupts at .88s. Brick at .83, may be the RF.

Move rcur 1mm inwards at .8s. See if the RF crowd notices.
EF4 to -1290A from -1285.
--------------------------------------------------------------------------------
990211018 HUTCH PHYSICS_OPERATOR Feb 11 1999 2:00:18:436PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Disrupts at 0.9s. Another big impurity injection. 2MW RF.

Raise pulse gas 3 to 50 from 40 during 50-100ms.
Turn off the B-side lower (Argon).
--------------------------------------------------------------------------------
990211019 HUTCH PHYSICS_OPERATOR Feb 11 1999 2:17:58:530PM
. . . . . . . . . . . . . . . . . . . .
Plasma till 1.57 sec.

Early gas puff to 60.
Did some more EF4 tweaking in ramp down to try to help EF2.
--------------------------------------------------------------------------------
990211020 HUTCH PHYSICS_OPERATOR Feb 11 1999 2:39:28:293PM
. . . . . . . . . . . . . . . . . . . .
Plasma till about 1.5s. Transmitter 2 alone gives 1.3 MW.
Succeeded in avoiding the EF2 zeroing.
However, now EF1L is zeroing out and suddenly waking up again.
Not clear that this is really the cause of the ramp-down disruption. There
is lots of gas.

EF4 to -1275 from -1290.
Early gas puff to 70.
Reenable pulse-gas 1.
--------------------------------------------------------------------------------
990211021 HUTCH PHYSICS_OPERATOR Feb 11 1999 3:02:20:983PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Disrupts at .56 sec. Nasty density rises starting .32s.
This shot is a black eye for argon (30 ms worth at 1 psi).

nl04 to .7 at .18s. The feedback seems to be easing off a bit early on the
pulse gas.
PG3 V to 60V. Perhaps we were giving more than enough.
Disable argon again.
--------------------------------------------------------------------------------
990211022 HUTCH PHYSICS_OPERATOR Feb 11 1999 3:11:29:090PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Does not disrupt.
Momentary 3MW of RF seems to induce an H-mode very briefly?

.8cm inward plasma shift at .5
Compensate for the offset jump at 1.2s.
--------------------------------------------------------------------------------
990211023 HUTCH PHYSICS_OPERATOR Feb 11 1999 3:19:56:233PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Disrupts at .82s. Several bricks. Suspect the RF.

No changes
--------------------------------------------------------------------------------
990211024 HUTCH PHYSICS_OPERATOR Feb 11 1999 3:53:00:623PM
. . . . . . . . . . . . . . . . . . . .
Plasma disrupts at .87s. Bricks.

Change clearin to -.005 from -.008.
--------------------------------------------------------------------------------
990211025 HUTCH PHYSICS_OPERATOR Feb 11 1999 3:53:43:890PM
. . . . . . . . . . . . . . . . . . . .
Plasma to 1.17s. Just survives the bite at .8s.

Initial gas puff to 65.
RF of transmitter 1 move to .8s from .6s.
--------------------------------------------------------------------------------
990211026 HUTCH PHYSICS_OPERATOR Feb 11 1999 4:14:51:030PM
. . . . . . . . . . . . . . . . . . . .
Plasma to 1.6s. Several little H-modes at about 2MW, tripping out the RF.

No changes except RF tuning.
--------------------------------------------------------------------------------
990211027 HUTCH PHYSICS_OPERATOR Feb 11 1999 4:21:51:106PM
. . . . . . . . . . . . . . . . . . . .
Fizzle. Breakdown slightly late. Bz is noticeably higher. 6mT at .01s.

EF4 to -1285A
--------------------------------------------------------------------------------
990211028 HUTCH PHYSICS_OPERATOR Feb 11 1999 4:38:26:060PM
. . . . . . . . . . . . . . . . . . . .
Plasma till .97. Little H-mode.

Lower density to .9e20 from 1.2e20. See if that helps to survive transitions
and whatever is being injected.
--------------------------------------------------------------------------------
990211029 HUTCH PHYSICS_OPERATOR Feb 11 1999 4:54:25:793PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Ramps down to 1.7s when the power supplies are inverted.
3 H-modes.

No changes
--------------------------------------------------------------------------------
990211030 HUTCH PHYSICS_OPERATOR Feb 11 1999 5:09:11:076PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Runs till 1.81s, most of the way down. EF2s still seem to be
driven into inversion. H-mode threshold about 2MW.
ZXL proportional gain steps to zero at 1.7s. This seems the only candidate
for the cause of the power supplies swings starting at that time.

Session Leader Comments

Feb 11 1999 08:00:09:467AM Steve Wolfe Run plan for 990211

Miniproposal 206: Restart Operations.
214 D & E port RF commissioning.

Physop: Hutchinson.

Overnight ECDC in D2.
***** Please ensure a sweep all the way out to the outer wall. *******

Engineering setup:

Power supply setup as on 990210

TF under hybrid control

Gas setup -
****** fill B-top with 20 psi of DEUTERIUM Hybrid enabled ******

Please note this B-top pressure is a major difference from the 6 psi
normally run. The intention is to develop start-ups with decent
pressure in this valve so we can use it for additional gas puffs
during the shot.

fill B-side lower with 1 psi of Ar Hybrid enabled
fill C-side with 30 psi of DEUTERIUM Hybrid enabled

The following gate valves should be enabled, assuming no vacuum problems:

ECE, VUV

Plan

We will want to do one or two gas-only tests to begin with to verify
that we can get sensible pressures with the 20 psi in the B-top and
shorter pulses on the valve, of course.

Since the boronization will not have taken place, the remainder of the
run will be devoted to RF conditioning by putting on the RF at
managable power levels for long durations (0.5s or more). If the RF is
reproducible, we would anticipate the plasmas will be also.

We will also try to pick up the calibration shots that Jim Terry is still
missing from Tuesday's run.

Feb 11 1999 09:25:22:437AM 990211004 Steve Wolfe Shot 1 was EF4 and pg4 test: EF4 worked, gas too high
Shot 2 was gas only, still a bit high, Ian is leaving it.
Shot 3: try for plasma- fizzle.

Feb 11 1999 09:30:24:700AM 990211004 Steve Wolfe shot 4: drop gas 1msec (to 6msec).
Short disruption. .35sec pf breaker pulled, oh1
flake.

Feb 11 1999 09:49:16:280AM 990211005 Steve Wolfe shot 5: just try again. fizzle
maybe Br, maybe Bz.

Feb 11 1999 10:10:02:280AM 990211006 Steve Wolfe shot 6: Drop Br and go again.
plasma to 1.47sec
Bad hesitation in current rise.

Feb 11 1999 10:18:54:263AM 990211007 Steve Wolfe shot 7: No changes. plasma to 1.50sec
RF =1MW, small amount of heating. H/D rises to .12

Feb 11 1999 10:38:40:077AM 990211008 Steve Wolfe shot 8: plasma. RF is having some sort of problem with one modulator.
Also, CAMAC problems.
Current rise still has a hesitation.

Feb 11 1999 11:08:42:950AM 990211009 Steve Wolfe shot 9: add some feedforward on Oh2 and EF1s to try to improve strike control
short disruption.

Feb 11 1999 11:25:49:733AM 990211010 Steve Wolfe shot 10: same, a little shorter. RXL is too far out, but is it the voltage change or flakes?

Feb 11 1999 11:39:47:717AM 990211011 Steve Wolfe shot 11: plasma. RF is low and lots of retries.
density falling,outer strike still high

Feb 11 1999 11:56:35:280AM 990211012 Steve Wolfe shot 12: Try an RXL tweak to get strike better.
plasma to 1.38sec
Hardly any RF. Strike point is lower late, but on floor early.

Three camac crates removed from GKE highgway. Seems to have fixed CAMAC problems.

Feb 11 1999 01:20:25:857PM 990211016 Steve Wolfe shot 16: Change the ZXL ramp in rampdown the other way: +.04 at 1.5sec, .06 at 1.8sec
Hutch back in the chair.
plasma to 1.52sec
Got some rf this time.

Feb 11 1999 01:34:08:857PM 990211017 Steve Wolfe shot 17: plasma to .87sec. junk.

Feb 11 1999 01:57:53:217PM 990211018 Steve Wolfe shot 18:plasma to .9sec

Feb 11 1999 02:02:55:170PM 990211019 Steve Wolfe shot 19: RF is having problems; gain is changing randomly on a module in feedback loop.
Try again, with no argon.

plasma to 1.57sec. RF ran, but still not under control.

Feb 11 1999 03:37:50:217PM 990211024 Steve Wolfe shot 24: disrupts at .87sec, similar to last one. Ian
blames the RF.

Feb 11 1999 03:52:06:857PM 990211025 Steve Wolfe shot 25: change gaps by 3mm (bigger).
Makes it to 1.2sec, but has two chunks at .93 and .98sec

Feb 11 1999 04:03:51:607PM 990211026 Steve Wolfe shot 26: modify rf, see if it helps.
plasma to 1.6sec
4 little h-modes. max rf is 2.4MW, but the h-modes switch it off.

Feb 11 1999 04:21:23:340PM 990211027 Steve Wolfe shot 27: fizzle. bz too positive?

Feb 11 1999 04:35:18:577PM 990211028 Steve Wolfe shot 28: tweak ef4 10A
disrupts at .92sec; short h-mode

Feb 11 1999 04:54:38:513PM 990211029 Steve Wolfe shot 29: lower the density
plasma ramps down. 1.72sec (invert gets it)
3 h-modes

Feb 11 1999 05:04:53:000PM 990211030 Steve Wolfe shot 30: plasma to 1.83sec
1 short h-mode.

Physics Operator Comments

Feb 11 1999 08:25:33:280AM Ian Hutchinson MP 206 Restart, and 214 RF commissioning.

Physop Hutch.

Got an error with cold start:

coldstart
set tree cmod
%SYSTEM-F-NOLOGNAM, no logical name match \REMCAM
So did:
USER10:[HUTCH]$ ccl remcam
Loading CTS definitions from remote node DAQA
Loading CTS definitions from remote node DAQ4
Loading CTS definitions from remote node DAQ2

Then coldstart runs:
wrap set
rtnode -- data loaded, A matrix responds
rtnode -- data loaded, M matrix responds
rtnode -- data loaded, PID matrix responds
RT_NODE Done

Feb 11 1999 09:03:45:140AM Ian Hutchinson Pulse gas from yesterday was 17ms ending at -.5s.

Change that to 10ms at time -1.s. Pulse gas 4, B-top.
Also fixed the incorrect z position in ramp down.
Shorten the ARgon puff from 40 to 20 ms.

Feb 11 1999 09:09:17:590AM 990211001 Ian Hutchinson Got too much pressure. Nearly 0.12mtorr.

Reduce puff length to 7ms.

Feb 11 1999 09:20:40:000AM 990211002 Ian Hutchinson Test gives .08 mtorr.

Feb 11 1999 09:22:43:483AM 990211003 Ian Hutchinson Fizzle.
CII is high, but the null is not too bad. Breakdown at 6ms

Fill puff to 6ms from 7ms.

Feb 11 1999 09:34:25:827AM 990211004 Ian Hutchinson Plasma. Hit by a brick at .35s.
Got initial pressure .067mtorr.

No changes.

Feb 11 1999 09:51:57:013AM 990211005 Ian Hutchinson Fizzle. Breakdown slightly later.
Fill pressure is exactly right and reproducible.

Lower br offset from 3.5 to 3.0 mT.

Feb 11 1999 10:11:59:030AM 990211006 Ian Hutchinson Plasma, to 1.45s.
Substantial hesitation from 15 to 20ms.
Got some RF power, but no trace. Also camac error on the probes.

No changes

Feb 11 1999 10:35:56:403AM 990211007 Ian Hutchinson Plasma. 1MW RF. Some heating.

Tweak OH1 voltage down from 80V to 40V at 15ms.

Feb 11 1999 11:00:44:280AM 990211008 Ian Hutchinson Plasma. Got RF but camac errors again.
Cell access for TS. Power room access for RF.

In segment 2 insert programmed voltages on EF1 100V, and OH2 20V.
These are supposed to help the power supplies follow the demand better
during the shot, so the feedback does not have to work so hard.
This ought to get us a zxl/zxu nearer to what we are asking for.

Feb 11 1999 11:19:22:827AM 990211009 Ian Hutchinson Plasma. Brick at .35s then it nearly recovers, but a big density rise
to 4e20(!) and then disrupts.

No changes.

Feb 11 1999 11:33:23:607AM 990211010 Ian Hutchinson Plasma. Disrupts at .46s. Very similar to previous shot.
Some big marfe event, or gas puff happens starting at .35s.
Initiation was rather bad this shot. Bz was somewhat higher.

Reduced the OH2 to 5 volts in this regoin of the plasma program.
Perhaps those voltage tweaks subtly changed the shape.

Feb 11 1999 11:46:44:327AM 990211011 Ian Hutchinson Plasma. RF tripping and retrying.

Move the rcur switched offset to 1.4s from 1.6 s.
RXL to 0 from .006m

Feb 11 1999 01:09:17:450PM 990211012 Ian Hutchinson Plasma to 1.4s

Feb 11 1999 12:13:10:950PM 990211013 Steve Wolfe shot 13: Wolfe taking over as PHYSOP while Ian is away; I killed his PCS session and am using my own.
Add some Ar for JR (to 30msec).
Change RXL program to ramp from .006 at .45 to 0 at 1.2sec
The disruption came before the RCUR change Ian made, so ...

plasma to 1.51 sec, no rf. strike is better, still a bit high at the end.
Try increasing the RXL sweep.

Feb 11 1999 12:35:34:340PM 990211014 Steve Wolfe shot 14: Move RXL to -.005 at t=1.2sec
plasma to 1.52sec, RXL does what I ask. It's on the floor a bit early, but JT is happy so
leave it alone.

See about the rampdown.

Feb 11 1999 12:58:28:293PM 990211015 Steve Wolfe shot 15: ZXL is ramping from -.015 to .032 between 1.2 and 1.51sec; slow that down
to go to +.01 at 1.51sec (about half as much motion)
plasma to 1.48sec. Still no RF

Feb 11 1999 01:05:20:403PM 990211015 Steve Wolfe shot 16: Change the ZXL ramp in rampdown the other way: +.04 at 1.5sec, .06 at 1.8sec

Feb 11 1999 01:08:09:373PM 990211015 Ian Hutchinson Plasma to 1.45s.

Feb 11 1999 01:29:21:123PM 990211016 Ian Hutchinson Plasma to 1.53s.

rcur offset switch moved to 1.2s.
Ramp EF4 down more quickly in the ramp-down to help EF2

Feb 11 1999 01:45:21:560PM 990211017 Ian Hutchinson Plasma disrupts at .88s. Brick at .83, may be the RF.

Move rcur 1mm inwards at .8s. See if the RF crowd notices.
EF4 to -1290A from -1285.

Feb 11 1999 02:00:18:437PM 990211018 Ian Hutchinson Plasma. Disrupts at 0.9s. Another big impurity injection. 2MW RF.

Raise pulse gas 3 to 50 from 40 during 50-100ms.
Turn off the B-side lower (Argon).

Feb 11 1999 02:17:58:530PM 990211019 Ian Hutchinson Plasma till 1.57 sec.

Early gas puff to 60.
Did some more EF4 tweaking in ramp down to try to help EF2.

Feb 11 1999 02:39:28:293PM 990211020 Ian Hutchinson Plasma till about 1.5s. Transmitter 2 alone gives 1.3 MW.
Succeeded in avoiding the EF2 zeroing.
However, now EF1L is zeroing out and suddenly waking up again.
Not clear that this is really the cause of the ramp-down disruption. There
is lots of gas.

EF4 to -1275 from -1290.
Early gas puff to 70.
Reenable pulse-gas 1.

Feb 11 1999 03:02:20:983PM 990211021 Ian Hutchinson Plasma. Disrupts at .56 sec. Nasty density rises starting .32s.
This shot is a black eye for argon (30 ms worth at 1 psi).

nl04 to .7 at .18s. The feedback seems to be easing off a bit early on the
pulse gas.
PG3 V to 60V. Perhaps we were giving more than enough.
Disable argon again.

Feb 11 1999 03:11:29:090PM 990211022 Ian Hutchinson Plasma. Does not disrupt.
Momentary 3MW of RF seems to induce an H-mode very briefly?

.8cm inward plasma shift at .5
Compensate for the offset jump at 1.2s.

Feb 11 1999 03:19:56:233PM 990211023 Ian Hutchinson Plasma. Disrupts at .82s. Several bricks. Suspect the RF.

No changes

Feb 11 1999 03:53:00:623PM 990211024 Ian Hutchinson Plasma disrupts at .87s. Bricks.

Change clearin to -.005 from -.008.

Feb 11 1999 03:53:43:890PM 990211025 Ian Hutchinson Plasma to 1.17s. Just survives the bite at .8s.

Initial gas puff to 65.
RF of transmitter 1 move to .8s from .6s.

Feb 11 1999 04:14:51:030PM 990211026 Ian Hutchinson Plasma to 1.6s. Several little H-modes at about 2MW, tripping out the RF.

No changes except RF tuning.

Feb 11 1999 04:21:51:107PM 990211027 Ian Hutchinson Fizzle. Breakdown slightly late. Bz is noticeably higher. 6mT at .01s.

EF4 to -1285A

Feb 11 1999 04:38:26:060PM 990211028 Ian Hutchinson Plasma till .97. Little H-mode.

Lower density to .9e20 from 1.2e20. See if that helps to survive transitions
and whatever is being injected.

Feb 11 1999 04:54:25:793PM 990211029 Ian Hutchinson Plasma. Ramps down to 1.7s when the power supplies are inverted.
3 H-modes.

No changes

Feb 11 1999 05:09:11:077PM 990211030 Ian Hutchinson Plasma. Runs till 1.81s, most of the way down. EF2s still seem to be
driven into inversion. H-mode threshold about 2MW.
ZXL proportional gain steps to zero at 1.7s. This seems the only candidate
for the cause of the power supplies swings starting at that time.

Engineering Operator Comments

Shot Time Type Status Comment

1 08:57:21:107AM Test Ok ef4 test/ test ok

2 09:05:23:687AM Test Ok Gas Puff

3 09:13:13:717AM Plasma Ok no faults/dud

4 09:25:01:857AM Plasma Ok oh1 self powered ckt fired/disruption

5 09:39:32:750AM Plasma Ok no faults

6 09:55:32:043AM Plasma Ok no faults/plasma

7 10:10:52:873AM Plasma Ok no faults/plasma

8 10:25:57:467AM Plasma Ok no faults/plasma

9 11:01:54:107AM Plasma Ok no faults/plasma

10 11:16:55:543AM Plasma Ok no faults/plasma

11 11:32:03:293AM Plasma Ok no faults/plasma

12 11:48:15:090AM Plasma Ok No Fault / Plasma

13 12:05:53:390PM Plasma Ok No Faults / Plasma

14 12:26:04:623PM Plasma Ok No Faults / Plasma

15 12:49:44:013PM Plasma Ok NO Faults /Plasma

16 01:11:11:530PM Plasma Ok No Faults / Plasma

17 01:27:37:560PM Plasma Ok No Faults / Plasma

18 01:42:37:577PM Plasma Ok no faults/plasma

19 01:59:44:373PM Plasma Ok no faults/plasma

20 02:14:47:140PM Plasma Ok no faults/.plasma

21 02:37:07:013PM Plasma Ok check ef1 lower rev bridge

22 02:53:55:857PM Plasma Ok check ef1

23 03:09:58:670PM Plasma Ok no faults

24 03:26:31:390PM Plasma Ok no faults/plasma

25 03:41:32:000PM Plasma Ok no faults/plasma

26 03:58:59:827PM Plasma Ok no faults

27 04:15:11:640PM Plasma Ok no faults

28 04:27:43:793PM Plasma Ok no faults/plasma

29 04:42:43:250PM Plasma Ok no faults/plasma

30 04:57:47:623PM Plasma Ok No Faults /Plasma

Session Leader Comments
Feb 11 1999 08:00:09:467AM		Steve Wolfe	Run plan for 990211 Miniproposal 206: Restart Operations. 214 D & E port RF commissioning. Physop: Hutchinson. Overnight ECDC in D2. *** Please ensure a sweep all the way out to the outer wall. *** Engineering setup: Power supply setup as on 990210 TF under hybrid control Gas setup - ** fill B-top with 20 psi of DEUTERIUM Hybrid enabled **** Please note this B-top pressure is a major difference from the 6 psi normally run. The intention is to develop start-ups with decent pressure in this valve so we can use it for additional gas puffs during the shot. fill B-side lower with 1 psi of Ar Hybrid enabled fill C-side with 30 psi of DEUTERIUM Hybrid enabled The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV Plan We will want to do one or two gas-only tests to begin with to verify that we can get sensible pressures with the 20 psi in the B-top and shorter pulses on the valve, of course. Since the boronization will not have taken place, the remainder of the run will be devoted to RF conditioning by putting on the RF at managable power levels for long durations (0.5s or more). If the RF is reproducible, we would anticipate the plasmas will be also. We will also try to pick up the calibration shots that Jim Terry is still missing from Tuesday's run.
Feb 11 1999 09:25:22:437AM	990211004	Steve Wolfe	Shot 1 was EF4 and pg4 test: EF4 worked, gas too high Shot 2 was gas only, still a bit high, Ian is leaving it. Shot 3: try for plasma- fizzle.
Feb 11 1999 09:30:24:700AM	990211004	Steve Wolfe	shot 4: drop gas 1msec (to 6msec). Short disruption. .35sec pf breaker pulled, oh1 flake.
Feb 11 1999 09:49:16:280AM	990211005	Steve Wolfe	shot 5: just try again. fizzle maybe Br, maybe Bz.
Feb 11 1999 10:10:02:280AM	990211006	Steve Wolfe	shot 6: Drop Br and go again. plasma to 1.47sec Bad hesitation in current rise.
Feb 11 1999 10:18:54:263AM	990211007	Steve Wolfe	shot 7: No changes. plasma to 1.50sec RF =1MW, small amount of heating. H/D rises to .12
Feb 11 1999 10:38:40:077AM	990211008	Steve Wolfe	shot 8: plasma. RF is having some sort of problem with one modulator. Also, CAMAC problems. Current rise still has a hesitation.
Feb 11 1999 11:08:42:950AM	990211009	Steve Wolfe	shot 9: add some feedforward on Oh2 and EF1s to try to improve strike control short disruption.
Feb 11 1999 11:25:49:733AM	990211010	Steve Wolfe	shot 10: same, a little shorter. RXL is too far out, but is it the voltage change or flakes?
Feb 11 1999 11:39:47:717AM	990211011	Steve Wolfe	shot 11: plasma. RF is low and lots of retries. density falling,outer strike still high
Feb 11 1999 11:56:35:280AM	990211012	Steve Wolfe	shot 12: Try an RXL tweak to get strike better. plasma to 1.38sec Hardly any RF. Strike point is lower late, but on floor early. Three camac crates removed from GKE highgway. Seems to have fixed CAMAC problems.
Feb 11 1999 01:20:25:857PM	990211016	Steve Wolfe	shot 16: Change the ZXL ramp in rampdown the other way: +.04 at 1.5sec, .06 at 1.8sec Hutch back in the chair. plasma to 1.52sec Got some rf this time.
Feb 11 1999 01:34:08:857PM	990211017	Steve Wolfe	shot 17: plasma to .87sec. junk.
Feb 11 1999 01:57:53:217PM	990211018	Steve Wolfe	shot 18:plasma to .9sec
Feb 11 1999 02:02:55:170PM	990211019	Steve Wolfe	shot 19: RF is having problems; gain is changing randomly on a module in feedback loop. Try again, with no argon. plasma to 1.57sec. RF ran, but still not under control.
Feb 11 1999 03:37:50:217PM	990211024	Steve Wolfe	shot 24: disrupts at .87sec, similar to last one. Ian blames the RF.
Feb 11 1999 03:52:06:857PM	990211025	Steve Wolfe	shot 25: change gaps by 3mm (bigger). Makes it to 1.2sec, but has two chunks at .93 and .98sec
Feb 11 1999 04:03:51:607PM	990211026	Steve Wolfe	shot 26: modify rf, see if it helps. plasma to 1.6sec 4 little h-modes. max rf is 2.4MW, but the h-modes switch it off.
Feb 11 1999 04:21:23:340PM	990211027	Steve Wolfe	shot 27: fizzle. bz too positive?
Feb 11 1999 04:35:18:577PM	990211028	Steve Wolfe	shot 28: tweak ef4 10A disrupts at .92sec; short h-mode
Feb 11 1999 04:54:38:513PM	990211029	Steve Wolfe	shot 29: lower the density plasma ramps down. 1.72sec (invert gets it) 3 h-modes
Feb 11 1999 05:04:53:000PM	990211030	Steve Wolfe	shot 30: plasma to 1.83sec 1 short h-mode.

Physics Operator Comments
Feb 11 1999 08:25:33:280AM		Ian Hutchinson	MP 206 Restart, and 214 RF commissioning. Physop Hutch. Got an error with cold start: coldstart set tree cmod %SYSTEM-F-NOLOGNAM, no logical name match \REMCAM So did: USER10:[HUTCH]$ ccl remcam Loading CTS definitions from remote node DAQA Loading CTS definitions from remote node DAQ4 Loading CTS definitions from remote node DAQ2 Then coldstart runs: wrap set rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds RT_NODE Done
Feb 11 1999 09:03:45:140AM		Ian Hutchinson	Pulse gas from yesterday was 17ms ending at -.5s. Change that to 10ms at time -1.s. Pulse gas 4, B-top. Also fixed the incorrect z position in ramp down. Shorten the ARgon puff from 40 to 20 ms.
Feb 11 1999 09:09:17:590AM	990211001	Ian Hutchinson	Got too much pressure. Nearly 0.12mtorr. Reduce puff length to 7ms.
Feb 11 1999 09:20:40:000AM	990211002	Ian Hutchinson	Test gives .08 mtorr.
Feb 11 1999 09:22:43:483AM	990211003	Ian Hutchinson	Fizzle. CII is high, but the null is not too bad. Breakdown at 6ms Fill puff to 6ms from 7ms.
Feb 11 1999 09:34:25:827AM	990211004	Ian Hutchinson	Plasma. Hit by a brick at .35s. Got initial pressure .067mtorr. No changes.
Feb 11 1999 09:51:57:013AM	990211005	Ian Hutchinson	Fizzle. Breakdown slightly later. Fill pressure is exactly right and reproducible. Lower br offset from 3.5 to 3.0 mT.
Feb 11 1999 10:11:59:030AM	990211006	Ian Hutchinson	Plasma, to 1.45s. Substantial hesitation from 15 to 20ms. Got some RF power, but no trace. Also camac error on the probes. No changes
Feb 11 1999 10:35:56:403AM	990211007	Ian Hutchinson	Plasma. 1MW RF. Some heating. Tweak OH1 voltage down from 80V to 40V at 15ms.
Feb 11 1999 11:00:44:280AM	990211008	Ian Hutchinson	Plasma. Got RF but camac errors again. Cell access for TS. Power room access for RF. In segment 2 insert programmed voltages on EF1 100V, and OH2 20V. These are supposed to help the power supplies follow the demand better during the shot, so the feedback does not have to work so hard. This ought to get us a zxl/zxu nearer to what we are asking for.
Feb 11 1999 11:19:22:827AM	990211009	Ian Hutchinson	Plasma. Brick at .35s then it nearly recovers, but a big density rise to 4e20(!) and then disrupts. No changes.
Feb 11 1999 11:33:23:607AM	990211010	Ian Hutchinson	Plasma. Disrupts at .46s. Very similar to previous shot. Some big marfe event, or gas puff happens starting at .35s. Initiation was rather bad this shot. Bz was somewhat higher. Reduced the OH2 to 5 volts in this regoin of the plasma program. Perhaps those voltage tweaks subtly changed the shape.
Feb 11 1999 11:46:44:327AM	990211011	Ian Hutchinson	Plasma. RF tripping and retrying. Move the rcur switched offset to 1.4s from 1.6 s. RXL to 0 from .006m
Feb 11 1999 01:09:17:450PM	990211012	Ian Hutchinson	Plasma to 1.4s
Feb 11 1999 12:13:10:950PM	990211013	Steve Wolfe	shot 13: Wolfe taking over as PHYSOP while Ian is away; I killed his PCS session and am using my own. Add some Ar for JR (to 30msec). Change RXL program to ramp from .006 at .45 to 0 at 1.2sec The disruption came before the RCUR change Ian made, so ... plasma to 1.51 sec, no rf. strike is better, still a bit high at the end. Try increasing the RXL sweep.
Feb 11 1999 12:35:34:340PM	990211014	Steve Wolfe	shot 14: Move RXL to -.005 at t=1.2sec plasma to 1.52sec, RXL does what I ask. It's on the floor a bit early, but JT is happy so leave it alone. See about the rampdown.
Feb 11 1999 12:58:28:293PM	990211015	Steve Wolfe	shot 15: ZXL is ramping from -.015 to .032 between 1.2 and 1.51sec; slow that down to go to +.01 at 1.51sec (about half as much motion) plasma to 1.48sec. Still no RF
Feb 11 1999 01:05:20:403PM	990211015	Steve Wolfe	shot 16: Change the ZXL ramp in rampdown the other way: +.04 at 1.5sec, .06 at 1.8sec
Feb 11 1999 01:08:09:373PM	990211015	Ian Hutchinson	Plasma to 1.45s.
Feb 11 1999 01:29:21:123PM	990211016	Ian Hutchinson	Plasma to 1.53s. rcur offset switch moved to 1.2s. Ramp EF4 down more quickly in the ramp-down to help EF2
Feb 11 1999 01:45:21:560PM	990211017	Ian Hutchinson	Plasma disrupts at .88s. Brick at .83, may be the RF. Move rcur 1mm inwards at .8s. See if the RF crowd notices. EF4 to -1290A from -1285.
Feb 11 1999 02:00:18:437PM	990211018	Ian Hutchinson	Plasma. Disrupts at 0.9s. Another big impurity injection. 2MW RF. Raise pulse gas 3 to 50 from 40 during 50-100ms. Turn off the B-side lower (Argon).
Feb 11 1999 02:17:58:530PM	990211019	Ian Hutchinson	Plasma till 1.57 sec. Early gas puff to 60. Did some more EF4 tweaking in ramp down to try to help EF2.
Feb 11 1999 02:39:28:293PM	990211020	Ian Hutchinson	Plasma till about 1.5s. Transmitter 2 alone gives 1.3 MW. Succeeded in avoiding the EF2 zeroing. However, now EF1L is zeroing out and suddenly waking up again. Not clear that this is really the cause of the ramp-down disruption. There is lots of gas. EF4 to -1275 from -1290. Early gas puff to 70. Reenable pulse-gas 1.
Feb 11 1999 03:02:20:983PM	990211021	Ian Hutchinson	Plasma. Disrupts at .56 sec. Nasty density rises starting .32s. This shot is a black eye for argon (30 ms worth at 1 psi). nl04 to .7 at .18s. The feedback seems to be easing off a bit early on the pulse gas. PG3 V to 60V. Perhaps we were giving more than enough. Disable argon again.
Feb 11 1999 03:11:29:090PM	990211022	Ian Hutchinson	Plasma. Does not disrupt. Momentary 3MW of RF seems to induce an H-mode very briefly? .8cm inward plasma shift at .5 Compensate for the offset jump at 1.2s.
Feb 11 1999 03:19:56:233PM	990211023	Ian Hutchinson	Plasma. Disrupts at .82s. Several bricks. Suspect the RF. No changes
Feb 11 1999 03:53:00:623PM	990211024	Ian Hutchinson	Plasma disrupts at .87s. Bricks. Change clearin to -.005 from -.008.
Feb 11 1999 03:53:43:890PM	990211025	Ian Hutchinson	Plasma to 1.17s. Just survives the bite at .8s. Initial gas puff to 65. RF of transmitter 1 move to .8s from .6s.
Feb 11 1999 04:14:51:030PM	990211026	Ian Hutchinson	Plasma to 1.6s. Several little H-modes at about 2MW, tripping out the RF. No changes except RF tuning.
Feb 11 1999 04:21:51:107PM	990211027	Ian Hutchinson	Fizzle. Breakdown slightly late. Bz is noticeably higher. 6mT at .01s. EF4 to -1285A
Feb 11 1999 04:38:26:060PM	990211028	Ian Hutchinson	Plasma till .97. Little H-mode. Lower density to .9e20 from 1.2e20. See if that helps to survive transitions and whatever is being injected.
Feb 11 1999 04:54:25:793PM	990211029	Ian Hutchinson	Plasma. Ramps down to 1.7s when the power supplies are inverted. 3 H-modes. No changes
Feb 11 1999 05:09:11:077PM	990211030	Ian Hutchinson	Plasma. Runs till 1.81s, most of the way down. EF2s still seem to be driven into inversion. H-mode threshold about 2MW. ZXL proportional gain steps to zero at 1.7s. This seems the only candidate for the cause of the power supplies swings starting at that time.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:57:21:107AM	Test	Ok	ef4 test/ test ok
2	09:05:23:687AM	Test	Ok	Gas Puff
3	09:13:13:717AM	Plasma	Ok	no faults/dud
4	09:25:01:857AM	Plasma	Ok	oh1 self powered ckt fired/disruption
5	09:39:32:750AM	Plasma	Ok	no faults
6	09:55:32:043AM	Plasma	Ok	no faults/plasma
7	10:10:52:873AM	Plasma	Ok	no faults/plasma
8	10:25:57:467AM	Plasma	Ok	no faults/plasma
9	11:01:54:107AM	Plasma	Ok	no faults/plasma
10	11:16:55:543AM	Plasma	Ok	no faults/plasma
11	11:32:03:293AM	Plasma	Ok	no faults/plasma
12	11:48:15:090AM	Plasma	Ok	No Fault / Plasma
13	12:05:53:390PM	Plasma	Ok	No Faults / Plasma
14	12:26:04:623PM	Plasma	Ok	No Faults / Plasma
15	12:49:44:013PM	Plasma	Ok	NO Faults /Plasma
16	01:11:11:530PM	Plasma	Ok	No Faults / Plasma
17	01:27:37:560PM	Plasma	Ok	No Faults / Plasma
18	01:42:37:577PM	Plasma	Ok	no faults/plasma
19	01:59:44:373PM	Plasma	Ok	no faults/plasma
20	02:14:47:140PM	Plasma	Ok	no faults/.plasma
21	02:37:07:013PM	Plasma	Ok	check ef1 lower rev bridge
22	02:53:55:857PM	Plasma	Ok	check ef1
23	03:09:58:670PM	Plasma	Ok	no faults
24	03:26:31:390PM	Plasma	Ok	no faults/plasma
25	03:41:32:000PM	Plasma	Ok	no faults/plasma
26	03:58:59:827PM	Plasma	Ok	no faults
27	04:15:11:640PM	Plasma	Ok	no faults
28	04:27:43:793PM	Plasma	Ok	no faults/plasma
29	04:42:43:250PM	Plasma	Ok	no faults/plasma
30	04:57:47:623PM	Plasma	Ok	No Faults /Plasma