Alcator C-Mod Run 1050620 Information

Miniproposals

Miniproposal: 296

Date Filed: 5/14/2001

Title: Confirmation of Thomson scattering density calibration using electron cyclotron emission cutoffs

First Author: Jerry Hughes

Session Leader: Kirill Zhurovich (shots 1-15)

Miniproposal: 419

Date Filed: 4/8/2005

Title: Fiducial wall pumping measurements for comparing operating conditions

First Author: Bruce Lipschultz

Session Leader: Bruce Lipschultz (shots 16-35)

Operators
Session leader(s):	Kirill Zhurovich,Bruce Lipschultz
Physics operator(s):	Ron Parker
Engineering operator(s):	Bill Cochran,Gary Dekow,Ed Fitzgerald

Engineering Operator Run Comment
MP #296 and MP #419

Session Leader Plans

Entered: Jun 20 2005 08:48:00:120AM

Author: Kirill Zhurovich

----------------------------------------------------------------------------
1050616xxx KIRILL SL_PLAN Jun 15 2005 12:24:33:316PM
. . . . . . . . . . . . . . . . . . . .
Run plan for 1050620a (same as for 1050616):
MP #296 (revised) 'TS/ECE density calibration'

Configure GPC, GPC2 for 4T operation
No RF
L-mode operation, avoid getting ohmic H-modes

Basically repeat the run 1050412c, shots 23-28.

Start with 1050412023:
Bt=3.9 T
Ip=0.87 MA
LSN
nl up to 2e20

Magnetic field and gas puff will be optimized to get ECE cutoffs for all TS spatial channels.

Some shots will be repeated for different optical setup in TS lab.

Entered: Jun 20 2005 11:37:08:760AM

Author: Bruce Lipschultz

MP #419: 'Fiducial wall pumping measurements for comparing operating conditions'
There are several goals for this afternoon:

We are looking for 1 MA shots with densities just under nl04=1.e20. We need the shots not to disrupt through to current reaching close to zero. The amount of RF has to be constant, shot to shot.

1) see if the wall pumping is the same at this point as it was pre-titaniumization. This will require several shots. But we will be seeing if the wall pumping saturates as well. SO this will require at least 5 constant shots. The equilibrium used will be 1050610020. The amount of RF to be determined as mentioned earlier.

2) Vary the wetted area to see if that affects the pumping. We will start with LSN on the vertical target (step 1). Then move to inner wall limited (Granetz to supply shot number from last week). Finally to upper single null (shot 1050608014 for equilibrium).

3) We would also like to know if the pumping saturates with length of shots (fluence). This will require several shots at verious flattop periods varying from 0., 0.5, 1.0, 1.5 and 2.0 seconds. The density may be down, more like 0.85. Likely not time enough today.

Physics Operators Plans

Entered: Jun 17 2005 01:13:18:137PM

Author: Ron Parker

Run plan for Monday, 20 June 2005

MP #296 (revised) "TS/ECE Density Calibration"
MP #419 "Fiducial wall pumping measurements for comparing operating conditions"

SL: Kirill Zhurovic (MP #296), Bruce Lipschultz (MP #419)

PO: Ron Parker

Run BEGINS @ 09:00 and ENDS @ 17:00

No ECDC, bake overnight at 60C

Power systems as on 1050616002

A-coil in standard configuration (+Dtop -Dbot -Jtop +Jbot)
C-coil Start=0.3sec, Invert=2.0sec

No ICRF initially, may require for MP #419

Gas setup:
fill B-top 6psi D2 Hybrid Enabled (PG4)
fill B-side lower 1psi Argon Hybrid Enabled (PG1)
leave B-side Upper alone Hybrid DISABLED (PG2)
fill B-main 30psi D2 Hybrid Enabled (PG3)

Enable: ECE, VUV, Z-bolo shutter

Run Plan: (MP #296)

Configure GPC, GPC2 for 4T operation
No RF, L-mode operation, avoid getting ohmic H-modes

Basically repeat the run 1050412c, shots 23-28.

Start with 1050412023:
Bt=3.9 T
Ip=0.87 MA
LSN
nl up to 2e20

Magnetic field and gas puff will be optimized to get ECE cutoffs for all TS spatial channels.

Some shots will be repeated for different optical setup in TS lab.

Run Plan: (MP #419)

Load ohmic shot with 1 MA, 5.4 T, nl_04 = 0.85 (e.g., 1050610020 w/o RF)

Run discharges of varying length. Gate valves off for > 5 minutes after each shot.

Session Leader Summaries

Entered: Jun 20 2005 06:03:55:590PM

Author: Bruce Lipschultz

MP419 - 'Fiducial wall pumping measurements for comparing operating conditions'
1050620

Two pieces of information from this run:

1) Continued shot after shot repetition of the same shot did not lead quickly to saturation: If saturation of the wall is occurring it is slowly. There did appear to be some drop in pumping. But then, in the 4th shot of the sequence (20) we corrected the density dropping slightly and the wall pumping came up a bit. In the last shot of the sequence, we got an H-mode and the pumping was in line with earlier shots.

2) Changing the wetted surface led to changes in wall pumping: When we shifted the strike point off of the vertical plate to the floor (23-26) the pumping dropped by a factor of 2.5-3. When we went to USN (28-30) the pumping returned to values almost as high as with the strike point on the lower vertical plate. Unfortunately, the inner wall limited shots (32-34) were disruptive and the pumping results for those equilibria are not comparable. Certainly the density was high during those shots, above the programmed value (and the feedback gas turned off) implying that the wall was seriously outgassing during the shot. On the last shot (35) we switched to outer limited. The wall pumping was the highest of the day BUT, this shot followed several disruptions and the divertor pressures were 35 mT, almost as high as for LSN plasmas (40 mT), indicating that the plasma was not really limited. More work needed here. I should mention that when we returned to the vertical plate (shot 27) the wall pumping was the same as earlier in the run.

Lastly, the values for wall pumping with the strike point on the vertical plaate (LSN) were similar to that of 1050412 run, pre-sboronization and pre-titaniumization. So, it appears on a gross level that the wall pumping is that we are operating 'normally'.

Physics Operator Summaries

Entered: Jun 20 2005 05:17:11:303PM

Author: Ron Parker

The run had two parts, first completion of MP 296, Thomson Calibration, then continuation of MP 419 on Wall Pumping Studies.

The machine ran well for both MP's. The Thomson calibrations were completed about
half way through the run. The only difficulty encountered during the entire run was trying to avoid a disruption during rampdown for a limiter shot, the last part of MP 419. This will take some work, possibly moving the plasma to the outside limiter during rampdown.

Early in the run, there was some difficulty in getting a reliable startup. The situation was improved by a suggestion of Steve Wolfe, who recommended importing segment 1 from an optimized startup, namely shot 1050525001. From this point onward (shot 9) there were no problems with startup with one exception: shot 31 which was a full bore dud for which absolutely no reason was evident.

Scorecard: 4 fizzles, 1 dud and 29 full length plasmas.

About 10 minutes were lost due to one data system hangup, and two of the full length shots were improperly loaded (Operator Error). All in all, a successful run.

Session Leader Comments

Jun 20 2005 09:10:19:413AM 1050620001 Kirill Zhurovich No plasma...

Jun 20 2005 09:29:10:060AM 1050620002 Kirill Zhurovich Good shot.
Got ECE cutoffs for Ch. 2-5 (R~ 70-79cm)
ECE Ch.6-8 (R ~ 82-87cm) have low signal

Jun 20 2005 09:40:18:650AM 1050620003 Kirill Zhurovich No plasma

Jun 20 2005 10:01:35:550AM 1050620004 Kirill Zhurovich Great shot.
Unfortunately, something went wrong: both lasers stoppped firing in the middle of the shot + both gate valves closed at 25mT

Jun 20 2005 10:06:36:640AM 1050620005 Kirill Zhurovich No plasma, it's a Murphy's law...

Jun 20 2005 10:21:05:027AM 1050620006 Kirill Zhurovich Great shot.
Got ECE cutoffs for Ch. 2-7 (R ~ 71.5-86.5 cm)

Jun 20 2005 10:31:59:553AM 1050620007 Kirill Zhurovich We tried to delay the gas puff by ~100ms.
No plasma, unfortunately

Jun 20 2005 10:56:48:700AM 1050620008 Kirill Zhurovich Good shot.
Got ECE cutoffs for Ch. 2-7.
No density analysis/mapping yet due to problems with the EFIT

Jun 20 2005 10:59:34:747AM 1050620008 Kirill Zhurovich Start ECE calibrations for the other optical setup (no lens in front of labsphere) in TS lab

Jun 20 2005 11:17:22:097AM 1050620009 Kirill Zhurovich Good shot,
but no ECE signal (ECE PLC color settings confused me):(

Jun 20 2005 11:30:48:060AM 1050620010 Kirill Zhurovich Good shot.
Got ECE cutoffs for Ch 2-7 (R ~ 71.5-86.5 cm).
Ch.1 is marginal.

Jun 20 2005 11:41:05:057AM 1050620011 Kirill Zhurovich Good shot.
Got ECE cutoffs for Ch 2-7 (R ~ 70-85 cm).
Ch.1 is marginal.

Jun 20 2005 12:01:10:957PM 1050620012 Kirill Zhurovich Good shot.
Got ECE cutoffs for Ch 2-7 (R ~ 70-84.7 cm).
Ch.1 is marginal.
Requested a change of magnetic field from 3.9T to 3.95T
This should shift ECE channels outward by ~.75cm

Jun 20 2005 12:07:30:000PM 1050620013 Kirill Zhurovich Good shot.
Got ECE cutoffs for Ch 2-7 (R ~ 71-85.5 cm).
Ch.1 is marginal.

Jun 20 2005 12:20:15:153PM 1050620014 Kirill Zhurovich Good shot.
Got ECE cutoffs for Ch 2-7 (R ~ 70.7-85.5 cm).

Jun 20 2005 12:32:36:037PM 1050620015 Kirill Zhurovich Good shot.
Got ECE cutoffs for Ch 2-7 (R ~ 72.3-86.8 cm).
This is the last shot for ECE/TS calibration.

Jun 20 2005 12:53:16:450PM 1050620016 Bruce Lipschultz Starting off with 1 MA LSN constant shots.

Fine shot, nl04=1. L-mode with 1 MW of RF

Jun 20 2005 01:12:39:180PM 1050620017 Bruce Lipschultz Fine shot, nl04=1. L-mode with 1 MW of RF

density dropping slightly after 1 second. It looks like the feedback is truned off then in anticipation of an H-mode.

Jun 20 2005 01:20:35:080PM 1050620018 Bruce Lipschultz Fine shot, nl04=1. L-mode with 1 MW of RF

Jun 20 2005 01:34:36:357PM 1050620018 Bruce Lipschultz Fine shot, nl04=1. L-mode with 1 MW of RF

Jun 20 2005 01:58:16:350PM 1050620019 Bruce Lipschultz nl04=1. with 1 MW of RF L-mode

Jun 20 2005 01:59:25:863PM 1050620020 Bruce Lipschultz nl04=1. with 1 MW of RF L-mode

gas puff feedback extended to 1.3 seconds

Jun 20 2005 01:57:03:817PM 1050620021 Bruce Lipschultz nl04=1. with 1 MW of RF

Buit got an H-mode!

The wall pumping appears to be holding pretty steady, perhaps dropping a little bit. from 12 tl on shot 16 to 10 tl on shot 19. Shot 20 was back up to 11.3

Jun 20 2005 02:17:46:607PM 1050620022 Bruce Lipschultz nl04=1. with 1 MW of RF H-mode during RF

had the lower strike point down the plate to the bottom.

Very much less pumping (see RGA entry)

Jun 20 2005 02:36:21:523PM 1050620023 Bruce Lipschultz nl04=1. with 1 MW of RF H-mode during RF

Ohmic H-mode before RF. It seems like the H-mode threshold is dropping.

had the lower strike point on the floor.

wall outgassing instead of pumping

Jun 20 2005 02:45:42:610PM 1050620024 Bruce Lipschultz nl04=1. strictly Ohmic - still getting H-modes

had the lower strike point on the floor.

wall pumping

Jun 20 2005 02:57:07:623PM 1050620025 Bruce Lipschultz nl04=1. RF + Ohmic - still getting H-modes

had the lower strike point on the floor.

wall pumping

Jun 20 2005 03:12:11:960PM 1050620026 Bruce Lipschultz nl04=1. RF + Ohmic - still getting H-modes

had the lower strike point on the floor.

wall pumping

Jun 20 2005 03:26:24:957PM 1050620027 Bruce Lipschultz nl04=1. RF + Ohmic - still getting H-modes

had the lower strike point back on the vertical plate.

wall pumping back to that level

Jun 20 2005 03:39:09:933PM 1050620028 Bruce Lipschultz nl04=1. RF + Ohmic no H-modes

Upper single null

pumping higher than in the lower slot, but not as much as for on the lower vertical plate

Jun 20 2005 03:50:58:913PM 1050620029 Bruce Lipschultz nl04=1. RF + Ohmic no H-modes

Upper single null

pumping still close to that of the lower vertical plate

Jun 20 2005 04:03:35:440PM 1050620030 Bruce Lipschultz nl04=1. RF + Ohmic no H-modes

Upper single null

pumping still close to that of the lower vertical plate

Next shot on to inner limited

Jun 20 2005 04:15:28:407PM 1050620031 Bruce Lipschultz dud

Jun 20 2005 04:33:32:650PM 1050620032 Bruce Lipschultz Iner wall limited.

Density too high - 1.2 and gas valve turns off at 0.4 s.

Disrupts on the rampdown at 500 kA

wall outgassing

Jun 20 2005 04:37:34:240PM 1050620033 Bruce Lipschultz Inner wall limited.

Density too high - 1.2 and gas valve turns off.

Disrupts at start of rampdown at 950 kA

wall outgassing

Jun 20 2005 04:45:00:427PM 1050620033 Bruce Lipschultz Inner wall limited.

Density too high - 1.2 and gas valve turns off.

Disrupts at start of rampdown at 950 kA

wall outgassing

Jun 20 2005 04:57:52:937PM 1050620034 Bruce Lipschultz Inner wall limited.

Density too high - 1.2 and gas valve turns off.

Disrupts at start of rampdown at 850 kA

wall outgassing

Jun 20 2005 05:56:55:230PM 1050620035 Bruce Lipschultz Outer limited. But still observed significant divertor pressures.

Density (nl04) ~ 1.0e20

No RF

wall pumping - largest of the day. But, just after disruptions and the divertor pressures were 35 mT, almost as high as for LSN plasmas (40 mT), indicating that the plasma was not really limited. More work needed here.

Physics Operator Comments

Jun 20 2005 08:45:18:290AM 1050620001 Ron Parker Good morning! Today we'll try to make up the run scheduled for last
Thursday, 6/16/06. Assuming success with the Thomson calibration, we'll
move on to wall pumping experiments.

Jun 20 2005 09:17:52:050AM 1050620001 Ron Parker Patience folks, OH needs to cool a few more degrees.

Jun 20 2005 09:50:41:520AM 1050620001 Ron Parker First shot was a fizzle, fill pressure was high, 0.2 mT.

But programmed pulse was short???

On next shot, pulse gas prefill increased by 5 ms.

Jun 20 2005 09:37:56:760AM 1050620002 Ron Parker Shot 002 ran OK, as programmed. Disrupts on current rampdown.

Next shot: Field during flat top increased from 3.9 to 4.0 T.

Jun 20 2005 09:43:57:087AM 1050620003 Ron Parker Shot 003 fizzled, breakdown a bit late and fill pressure now ~0.06 mT.

Walls loaded up aftershot 002.

For next shot, 3 ms taken off pulse gas.

Jun 20 2005 10:02:50:953AM 1050620004 Ron Parker Shot 004 ran, breakdown OK, but fill pressure still a bit high.

Next: reduce puff by 2 ms, also reduce Bz(0) offset by 10 A.

Jun 20 2005 10:09:14:000AM 1050620005 Ron Parker Shot 005 fizzled, fill gas is still a bit too high. Reduce to 16 ms gas puff.

Jun 20 2005 10:31:48:943AM 1050620006 Ron Parker Shot 006 ran OK, as programmed. Still disrupts on rampdown going vertically unstable.

Jun 20 2005 10:35:56:113AM 1050620007 Ron Parker Shot 007 fizzled. It seems that every other shot is fizzling.

No changes, see if the next shot runs.

Jun 20 2005 10:56:43:357AM 1050620008 Ron Parker Shot 8 ran, good breakdown, disruption now at 500 kA.

Steve suggests using an optimized startup from 1050525001 and
this is implemented on next shot.

Meanwhile, data system hung on shot 008. Short (hopefully) delay.

Jun 20 2005 05:17:52:397PM 1050620009 Ron Parker Shot 9 ran OK, breakdown was later, 7 ms as compared with 5 ms for previous startup. No change for next shot except to touch up Bz(0).

Data system delay was about 10 minutes

Jun 20 2005 11:34:31:200AM 1050620010 Ron Parker Shot 10 ran OK, breakdown back to 5 ms with EF 4 at -1300 (from -1310).

Next shot: field reset to 3.9 T from 4.0) and argon puff added at 0.3 s, for 40 ms.

Jun 20 2005 11:45:20:383AM 1050620011 Ron Parker Shot ran OK, breakdown early (5 ms). Still disrupting at 500 kA.

Fill pressure perhaps a tad too high, 0.05 mTorr. Reduce prefill by 1 ms.for next shot.

Gas puff delayed by another 50 ms.

Jun 20 2005 12:00:31:520PM 1050620012 Ron Parker Shot 012 ran OK. Next: BT increased from 3.90 to 3.95 T.

Jun 20 2005 12:13:37:233PM 1050620013 Ron Parker Shot 13 ran OK, but disrupted at 850 kA.

Next: Same shot.

Jun 20 2005 12:26:56:010PM 1050620014 Ron Parker Shot 14 ran OK. Still disrupts at 850 kA during ramp down.

Next: BT increased to 4.05 T.

Jun 20 2005 12:39:26:380PM 1050620015 Ron Parker Shot 015 ran OK. This ends MP 296 part of run.

Next: Begin MP 419 part of run, with shot 1050610020 loaded in segment 2.

Segment 1 remains the same as in other shots today.

Jun 20 2005 12:53:53:373PM 1050620016 Ron Parker Shot 016 looked good. Early startup, full rampdown to 0 current.

RF power ~ 1 MW, no H-mode.

Fill pressure could be a tad too high, 0.046 Torr

No change for next shot.

Jun 20 2005 01:21:26:473PM 1050620017 Ron Parker Shot 017 was a repeat of shot 016. Good shot.

Jun 20 2005 05:11:24:947PM 1050620018 Ron Parker Shot 018 was another fine shot, running as programmed with early breakdown
and full rampdown to ~ 0 kA.

There will be a small delay awaiting instructions from SL.

Jun 20 2005 01:33:13:263PM 1050620019 Ron Parker Another good shot. Next: Extend density flattop to 1.3 ms.

Jun 20 2005 01:49:10:120PM 1050620020 Ron Parker Shot 20 looked good, density flattop extended as requested.
Next: same shot, with 1 ms off gas prepuff.

Jun 20 2005 02:04:16:643PM 1050620021 Ron Parker Sorry folks, I know it's a bit boring.

Shot 21 ran well, essentially repeat of previous two shots.

However, fill pressure has creeped up to 0.05 mTorr and
breakdown is delayed to 10 ms. Prefill pulse reduced
to 12 ms.

We'll sweep the lower X-point 1-1.5 cm further to the inside for the next shot.

Jun 20 2005 02:16:56:013PM 1050620022 Ron Parker Shot 22 ran well, breakdown back to 5.5 ms and lower X-point
moved as requested.

Next: Move the X-pont further inside, ~ 0.5 to 1.0 cm.
Also changed IC EF4 to -1305.

Jun 20 2005 05:11:53:620PM 1050620023 Ron Parker Shot 23 ran OK.

Next: Tweak RXl a bit to keep strike point from hitting indentation on
divertor floor.

Jun 20 2005 02:41:21:473PM 1050620024 Ron Parker Shot 24 ran well. One more shot here and we'll switch to upper null.

Jun 20 2005 02:55:55:640PM 1050620025 Ron Parker Shot 25 was OK. One more shot (26) here, at same conditions.

Jun 20 2005 03:12:38:790PM 1050620026 Ron Parker Shot 26 ran as programmed.

Next shot: upper null, from shot 1050608014.

Jun 20 2005 03:37:31:107PM 1050620027 Ron Parker Sorry folks, that was not an upper null shot. Wrong segment from shot 1050608014 was used. Should be OK this time.

Jun 20 2005 03:38:20:560PM 1050620028 Ron Parker OK, that was the single null shot.

But the outer gap was varying because Rcur was not constant.
Should be fixed for next shot.

Jun 20 2005 03:53:56:803PM 1050620029 Ron Parker Shot 29 ran OK. Continue with slight tweaking of Rcur.

Jun 20 2005 03:55:14:100PM 1050620030 Ron Parker Shot 30 ran OK, last upper single null shot.

Next: Limited inner wall shots, starting with 1050615022, but with 1 MA current..

Jun 20 2005 04:15:42:047PM 1050620031 Ron Parker Shot 31 was a dud, reason not evident.

Try again.

Jun 20 2005 04:39:01:757PM 1050620032 Ron Parker Shot 32 went off as programmed. Why was previous shot a dud???

Jun 20 2005 04:40:34:647PM 1050620033 Ron Parker Shot 33 ran but disrupted shortly after inversion in spite of attempts to
circularize it during ramp down.

For shot 34, we'll revert to reloaded shot 32.

Jun 20 2005 04:56:36:560PM 1050620034 Ron Parker For the next and last shot, shot 020 will be rerun, but clearin and Rcur will be adjusted so that the plasma will lean on the outer limiter.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:08:32:320AM Plasma Ok

2 09:22:20:237AM Plasma Ok

3 09:38:08:353AM Plasma Ok

4 09:50:52:100AM Plasma Ok

5 10:03:22:657AM Plasma Ok

6 10:16:03:183AM Plasma Ok

7 10:29:31:897AM Plasma Ok

8 10:42:03:050AM Plasma Ok

9 11:09:54:680AM Plasma Ok

10 11:22:43:127AM Plasma Ok

11 11:35:31:327AM Plasma Ok

12 11:50:42:680AM Plasma Ok

13 12:03:26:470PM Plasma Ok

14 12:15:50:217PM Plasma Ok

15 12:28:20:587PM Plasma Ok

16 12:44:37:050PM Plasma Ok

17 12:57:12:747PM Plasma Ok

18 01:09:50:150PM Plasma Ok

19 01:22:22:330PM Plasma Ok

20 01:35:50:030PM Plasma Ok

21 01:49:33:820PM Plasma Ok

22 02:05:20:033PM Plasma Ok

23 02:19:24:263PM Plasma Ok

24 02:32:49:727PM Plasma Ok

25 02:45:18:597PM Plasma Ok

26 02:58:09:467PM Plasma Ok

27 03:12:03:540PM Plasma Ok

28 03:24:37:520PM Plasma Ok

29 03:38:08:233PM Plasma Ok

30 03:51:14:620PM Plasma Ok

31 04:04:15:707PM Plasma Ok

32 04:16:48:530PM Plasma Ok

33 04:31:33:480PM Plasma Ok

34 04:45:23:317PM Plasma Ok

35 04:58:41:357PM Plasma Ok

Session Leader Comments
Jun 20 2005 09:10:19:413AM	1050620001	Kirill Zhurovich	No plasma...
Jun 20 2005 09:29:10:060AM	1050620002	Kirill Zhurovich	Good shot. Got ECE cutoffs for Ch. 2-5 (R~ 70-79cm) ECE Ch.6-8 (R ~ 82-87cm) have low signal
Jun 20 2005 09:40:18:650AM	1050620003	Kirill Zhurovich	No plasma
Jun 20 2005 10:01:35:550AM	1050620004	Kirill Zhurovich	Great shot. Unfortunately, something went wrong: both lasers stoppped firing in the middle of the shot + both gate valves closed at 25mT
Jun 20 2005 10:06:36:640AM	1050620005	Kirill Zhurovich	No plasma, it's a Murphy's law...
Jun 20 2005 10:21:05:027AM	1050620006	Kirill Zhurovich	Great shot. Got ECE cutoffs for Ch. 2-7 (R ~ 71.5-86.5 cm)
Jun 20 2005 10:31:59:553AM	1050620007	Kirill Zhurovich	We tried to delay the gas puff by ~100ms. No plasma, unfortunately
Jun 20 2005 10:56:48:700AM	1050620008	Kirill Zhurovich	Good shot. Got ECE cutoffs for Ch. 2-7. No density analysis/mapping yet due to problems with the EFIT
Jun 20 2005 10:59:34:747AM	1050620008	Kirill Zhurovich	Start ECE calibrations for the other optical setup (no lens in front of labsphere) in TS lab
Jun 20 2005 11:17:22:097AM	1050620009	Kirill Zhurovich	Good shot, but no ECE signal (ECE PLC color settings confused me):(
Jun 20 2005 11:30:48:060AM	1050620010	Kirill Zhurovich	Good shot. Got ECE cutoffs for Ch 2-7 (R ~ 71.5-86.5 cm). Ch.1 is marginal.
Jun 20 2005 11:41:05:057AM	1050620011	Kirill Zhurovich	Good shot. Got ECE cutoffs for Ch 2-7 (R ~ 70-85 cm). Ch.1 is marginal.
Jun 20 2005 12:01:10:957PM	1050620012	Kirill Zhurovich	Good shot. Got ECE cutoffs for Ch 2-7 (R ~ 70-84.7 cm). Ch.1 is marginal. Requested a change of magnetic field from 3.9T to 3.95T This should shift ECE channels outward by ~.75cm
Jun 20 2005 12:07:30:000PM	1050620013	Kirill Zhurovich	Good shot. Got ECE cutoffs for Ch 2-7 (R ~ 71-85.5 cm). Ch.1 is marginal.
Jun 20 2005 12:20:15:153PM	1050620014	Kirill Zhurovich	Good shot. Got ECE cutoffs for Ch 2-7 (R ~ 70.7-85.5 cm).
Jun 20 2005 12:32:36:037PM	1050620015	Kirill Zhurovich	Good shot. Got ECE cutoffs for Ch 2-7 (R ~ 72.3-86.8 cm). This is the last shot for ECE/TS calibration.
Jun 20 2005 12:53:16:450PM	1050620016	Bruce Lipschultz	Starting off with 1 MA LSN constant shots. Fine shot, nl04=1. L-mode with 1 MW of RF
Jun 20 2005 01:12:39:180PM	1050620017	Bruce Lipschultz	Fine shot, nl04=1. L-mode with 1 MW of RF density dropping slightly after 1 second. It looks like the feedback is truned off then in anticipation of an H-mode.
Jun 20 2005 01:20:35:080PM	1050620018	Bruce Lipschultz	Fine shot, nl04=1. L-mode with 1 MW of RF
Jun 20 2005 01:34:36:357PM	1050620018	Bruce Lipschultz	Fine shot, nl04=1. L-mode with 1 MW of RF
Jun 20 2005 01:58:16:350PM	1050620019	Bruce Lipschultz	nl04=1. with 1 MW of RF L-mode
Jun 20 2005 01:59:25:863PM	1050620020	Bruce Lipschultz	nl04=1. with 1 MW of RF L-mode gas puff feedback extended to 1.3 seconds
Jun 20 2005 01:57:03:817PM	1050620021	Bruce Lipschultz	nl04=1. with 1 MW of RF Buit got an H-mode! The wall pumping appears to be holding pretty steady, perhaps dropping a little bit. from 12 tl on shot 16 to 10 tl on shot 19. Shot 20 was back up to 11.3
Jun 20 2005 02:17:46:607PM	1050620022	Bruce Lipschultz	nl04=1. with 1 MW of RF H-mode during RF had the lower strike point down the plate to the bottom. Very much less pumping (see RGA entry)
Jun 20 2005 02:36:21:523PM	1050620023	Bruce Lipschultz	nl04=1. with 1 MW of RF H-mode during RF Ohmic H-mode before RF. It seems like the H-mode threshold is dropping. had the lower strike point on the floor. wall outgassing instead of pumping
Jun 20 2005 02:45:42:610PM	1050620024	Bruce Lipschultz	nl04=1. strictly Ohmic - still getting H-modes had the lower strike point on the floor. wall pumping
Jun 20 2005 02:57:07:623PM	1050620025	Bruce Lipschultz	nl04=1. RF + Ohmic - still getting H-modes had the lower strike point on the floor. wall pumping
Jun 20 2005 03:12:11:960PM	1050620026	Bruce Lipschultz	nl04=1. RF + Ohmic - still getting H-modes had the lower strike point on the floor. wall pumping
Jun 20 2005 03:26:24:957PM	1050620027	Bruce Lipschultz	nl04=1. RF + Ohmic - still getting H-modes had the lower strike point back on the vertical plate. wall pumping back to that level
Jun 20 2005 03:39:09:933PM	1050620028	Bruce Lipschultz	nl04=1. RF + Ohmic no H-modes Upper single null pumping higher than in the lower slot, but not as much as for on the lower vertical plate
Jun 20 2005 03:50:58:913PM	1050620029	Bruce Lipschultz	nl04=1. RF + Ohmic no H-modes Upper single null pumping still close to that of the lower vertical plate
Jun 20 2005 04:03:35:440PM	1050620030	Bruce Lipschultz	nl04=1. RF + Ohmic no H-modes Upper single null pumping still close to that of the lower vertical plate Next shot on to inner limited
Jun 20 2005 04:15:28:407PM	1050620031	Bruce Lipschultz	dud
Jun 20 2005 04:33:32:650PM	1050620032	Bruce Lipschultz	Iner wall limited. Density too high - 1.2 and gas valve turns off at 0.4 s. Disrupts on the rampdown at 500 kA wall outgassing
Jun 20 2005 04:37:34:240PM	1050620033	Bruce Lipschultz	Inner wall limited. Density too high - 1.2 and gas valve turns off. Disrupts at start of rampdown at 950 kA wall outgassing
Jun 20 2005 04:45:00:427PM	1050620033	Bruce Lipschultz	Inner wall limited. Density too high - 1.2 and gas valve turns off. Disrupts at start of rampdown at 950 kA wall outgassing
Jun 20 2005 04:57:52:937PM	1050620034	Bruce Lipschultz	Inner wall limited. Density too high - 1.2 and gas valve turns off. Disrupts at start of rampdown at 850 kA wall outgassing
Jun 20 2005 05:56:55:230PM	1050620035	Bruce Lipschultz	Outer limited. But still observed significant divertor pressures. Density (nl04) ~ 1.0e20 No RF wall pumping - largest of the day. But, just after disruptions and the divertor pressures were 35 mT, almost as high as for LSN plasmas (40 mT), indicating that the plasma was not really limited. More work needed here.

Physics Operator Comments
Jun 20 2005 08:45:18:290AM	1050620001	Ron Parker	Good morning! Today we'll try to make up the run scheduled for last Thursday, 6/16/06. Assuming success with the Thomson calibration, we'll move on to wall pumping experiments.
Jun 20 2005 09:17:52:050AM	1050620001	Ron Parker	Patience folks, OH needs to cool a few more degrees.
Jun 20 2005 09:50:41:520AM	1050620001	Ron Parker	First shot was a fizzle, fill pressure was high, 0.2 mT. But programmed pulse was short??? On next shot, pulse gas prefill increased by 5 ms.
Jun 20 2005 09:37:56:760AM	1050620002	Ron Parker	Shot 002 ran OK, as programmed. Disrupts on current rampdown. Next shot: Field during flat top increased from 3.9 to 4.0 T.
Jun 20 2005 09:43:57:087AM	1050620003	Ron Parker	Shot 003 fizzled, breakdown a bit late and fill pressure now ~0.06 mT. Walls loaded up aftershot 002. For next shot, 3 ms taken off pulse gas.
Jun 20 2005 10:02:50:953AM	1050620004	Ron Parker	Shot 004 ran, breakdown OK, but fill pressure still a bit high. Next: reduce puff by 2 ms, also reduce Bz(0) offset by 10 A.
Jun 20 2005 10:09:14:000AM	1050620005	Ron Parker	Shot 005 fizzled, fill gas is still a bit too high. Reduce to 16 ms gas puff.
Jun 20 2005 10:31:48:943AM	1050620006	Ron Parker	Shot 006 ran OK, as programmed. Still disrupts on rampdown going vertically unstable.
Jun 20 2005 10:35:56:113AM	1050620007	Ron Parker	Shot 007 fizzled. It seems that every other shot is fizzling. No changes, see if the next shot runs.
Jun 20 2005 10:56:43:357AM	1050620008	Ron Parker	Shot 8 ran, good breakdown, disruption now at 500 kA. Steve suggests using an optimized startup from 1050525001 and this is implemented on next shot. Meanwhile, data system hung on shot 008. Short (hopefully) delay.
Jun 20 2005 05:17:52:397PM	1050620009	Ron Parker	Shot 9 ran OK, breakdown was later, 7 ms as compared with 5 ms for previous startup. No change for next shot except to touch up Bz(0). Data system delay was about 10 minutes
Jun 20 2005 11:34:31:200AM	1050620010	Ron Parker	Shot 10 ran OK, breakdown back to 5 ms with EF 4 at -1300 (from -1310). Next shot: field reset to 3.9 T from 4.0) and argon puff added at 0.3 s, for 40 ms.
Jun 20 2005 11:45:20:383AM	1050620011	Ron Parker	Shot ran OK, breakdown early (5 ms). Still disrupting at 500 kA. Fill pressure perhaps a tad too high, 0.05 mTorr. Reduce prefill by 1 ms.for next shot. Gas puff delayed by another 50 ms.
Jun 20 2005 12:00:31:520PM	1050620012	Ron Parker	Shot 012 ran OK. Next: BT increased from 3.90 to 3.95 T.
Jun 20 2005 12:13:37:233PM	1050620013	Ron Parker	Shot 13 ran OK, but disrupted at 850 kA. Next: Same shot.
Jun 20 2005 12:26:56:010PM	1050620014	Ron Parker	Shot 14 ran OK. Still disrupts at 850 kA during ramp down. Next: BT increased to 4.05 T.
Jun 20 2005 12:39:26:380PM	1050620015	Ron Parker	Shot 015 ran OK. This ends MP 296 part of run. Next: Begin MP 419 part of run, with shot 1050610020 loaded in segment 2. Segment 1 remains the same as in other shots today.
Jun 20 2005 12:53:53:373PM	1050620016	Ron Parker	Shot 016 looked good. Early startup, full rampdown to 0 current. RF power ~ 1 MW, no H-mode. Fill pressure could be a tad too high, 0.046 Torr No change for next shot.
Jun 20 2005 01:21:26:473PM	1050620017	Ron Parker	Shot 017 was a repeat of shot 016. Good shot.
Jun 20 2005 05:11:24:947PM	1050620018	Ron Parker	Shot 018 was another fine shot, running as programmed with early breakdown and full rampdown to ~ 0 kA. There will be a small delay awaiting instructions from SL.
Jun 20 2005 01:33:13:263PM	1050620019	Ron Parker	Another good shot. Next: Extend density flattop to 1.3 ms.
Jun 20 2005 01:49:10:120PM	1050620020	Ron Parker	Shot 20 looked good, density flattop extended as requested. Next: same shot, with 1 ms off gas prepuff.
Jun 20 2005 02:04:16:643PM	1050620021	Ron Parker	Sorry folks, I know it's a bit boring. Shot 21 ran well, essentially repeat of previous two shots. However, fill pressure has creeped up to 0.05 mTorr and breakdown is delayed to 10 ms. Prefill pulse reduced to 12 ms. We'll sweep the lower X-point 1-1.5 cm further to the inside for the next shot.
Jun 20 2005 02:16:56:013PM	1050620022	Ron Parker	Shot 22 ran well, breakdown back to 5.5 ms and lower X-point moved as requested. Next: Move the X-pont further inside, ~ 0.5 to 1.0 cm. Also changed IC EF4 to -1305.
Jun 20 2005 05:11:53:620PM	1050620023	Ron Parker	Shot 23 ran OK. Next: Tweak RXl a bit to keep strike point from hitting indentation on divertor floor.
Jun 20 2005 02:41:21:473PM	1050620024	Ron Parker	Shot 24 ran well. One more shot here and we'll switch to upper null.
Jun 20 2005 02:55:55:640PM	1050620025	Ron Parker	Shot 25 was OK. One more shot (26) here, at same conditions.
Jun 20 2005 03:12:38:790PM	1050620026	Ron Parker	Shot 26 ran as programmed. Next shot: upper null, from shot 1050608014.
Jun 20 2005 03:37:31:107PM	1050620027	Ron Parker	Sorry folks, that was not an upper null shot. Wrong segment from shot 1050608014 was used. Should be OK this time.
Jun 20 2005 03:38:20:560PM	1050620028	Ron Parker	OK, that was the single null shot. But the outer gap was varying because Rcur was not constant. Should be fixed for next shot.
Jun 20 2005 03:53:56:803PM	1050620029	Ron Parker	Shot 29 ran OK. Continue with slight tweaking of Rcur.
Jun 20 2005 03:55:14:100PM	1050620030	Ron Parker	Shot 30 ran OK, last upper single null shot. Next: Limited inner wall shots, starting with 1050615022, but with 1 MA current..
Jun 20 2005 04:15:42:047PM	1050620031	Ron Parker	Shot 31 was a dud, reason not evident. Try again.
Jun 20 2005 04:39:01:757PM	1050620032	Ron Parker	Shot 32 went off as programmed. Why was previous shot a dud???
Jun 20 2005 04:40:34:647PM	1050620033	Ron Parker	Shot 33 ran but disrupted shortly after inversion in spite of attempts to circularize it during ramp down. For shot 34, we'll revert to reloaded shot 32.
Jun 20 2005 04:56:36:560PM	1050620034	Ron Parker	For the next and last shot, shot 020 will be rerun, but clearin and Rcur will be adjusted so that the plasma will lean on the outer limiter.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:08:32:320AM	Plasma	Ok
2	09:22:20:237AM	Plasma	Ok
3	09:38:08:353AM	Plasma	Ok
4	09:50:52:100AM	Plasma	Ok
5	10:03:22:657AM	Plasma	Ok
6	10:16:03:183AM	Plasma	Ok
7	10:29:31:897AM	Plasma	Ok
8	10:42:03:050AM	Plasma	Ok
9	11:09:54:680AM	Plasma	Ok
10	11:22:43:127AM	Plasma	Ok
11	11:35:31:327AM	Plasma	Ok
12	11:50:42:680AM	Plasma	Ok
13	12:03:26:470PM	Plasma	Ok
14	12:15:50:217PM	Plasma	Ok
15	12:28:20:587PM	Plasma	Ok
16	12:44:37:050PM	Plasma	Ok
17	12:57:12:747PM	Plasma	Ok
18	01:09:50:150PM	Plasma	Ok
19	01:22:22:330PM	Plasma	Ok
20	01:35:50:030PM	Plasma	Ok
21	01:49:33:820PM	Plasma	Ok
22	02:05:20:033PM	Plasma	Ok
23	02:19:24:263PM	Plasma	Ok
24	02:32:49:727PM	Plasma	Ok
25	02:45:18:597PM	Plasma	Ok
26	02:58:09:467PM	Plasma	Ok
27	03:12:03:540PM	Plasma	Ok
28	03:24:37:520PM	Plasma	Ok
29	03:38:08:233PM	Plasma	Ok
30	03:51:14:620PM	Plasma	Ok
31	04:04:15:707PM	Plasma	Ok
32	04:16:48:530PM	Plasma	Ok
33	04:31:33:480PM	Plasma	Ok
34	04:45:23:317PM	Plasma	Ok
35	04:58:41:357PM	Plasma	Ok