Alcator C-Mod Run 1060421 Information

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Miniproposals
Miniproposal:430
Date Filed: 7/26/2005
Title:Localization of the effect of boronization
First Author:Bruce Lipschultz
Session Leader:Steve Wukitch (shots 1-29)

Operators
Session leader(s):Steve Wukitch
Physics operator(s):Joseph Snipes
Engineering operator(s):Andy Pfeiffer,Bill Byford,Gary Dekow

Engineering Operator Run Comment
MP330 Localization of the effect of Boronization Session leader: Wukitch

Session Leader Plans
Entered: Apr 21 2006 12:36:13:857PM
Author: Steve Wukitch
Engineering setup for Friday 21-April-2006

MP430 Localization of the effect of Boronization

Session leader: Wukitch
Physics operator: Snipes

Overnight ECDC in D2, and bake at 60 C.
ECDC post RF conditioning before run.

Run begins at 09:00 and ends at 17:00

Power systems as on 1060407007 (1.0 MA fiducial, 5.4 T, LSN)

A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled.

Gas Setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar + 2 psi Ne Hybrid DISABLED (PG1)
fill B-side upper as is, Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
fill NINJA with 12 psi D2 Enabled

*** Boronization system set up for between-shot boronization before
the run but do not open the diborane bottle.

*** All between shot boronizations (BSB) 10 minutes. Each sweep 200
seconds with a 20 second pause. All sweeps are 65-75 cm with pause
at 70 cm. Boronization pressure set to 5 mTorr.

Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo shutters; these must be disabled for between-shot boronization

The A-Side TV camera shutter must be CLOSED before the boronizations
(before the run and for the rest of the day).
The MSE shutter must be CLOSED before the start of the run, and remain closed
throughout the day.

Important Diagnostics: standard impurity spectroscopy, Mo source
monitor, McPherson, emissive probe

-------------------------------------------------------------------------------
ICRF Setup: FMIT#1&2 in run-on by 8:30.
FMIT#3&4 in run-on by 7:30.
-------------------------------------------------------------------------------
Plan: use 1 MA, 5.4 T, nl_04~1

A) Comparison of impurity sources and surface heating:
LSN - 2-3 shots with J, D/E at different times.
Compare IR, Chromex measurements of the K-div top.
USN - 2-3 shots (a recent USN discharge is 1060315022)

B) Boronization erosion dependence on antenna (8 shots + 4 BSB's)
1) BSB followed by a D/E heating shot
2) J heating shot
3) BSB followed by J heating shot
4) D/E heating shot
5) BSB followed by two D/E heated discharges
6) BSB followed by two J heated discharges

may repeat 1-4 depending upon results

C) Effect of density on boronization erosion.
scan target density nl04 = 0.6, 0.8, 1.2

D) Effect of diborane pressure on boronization.
Vary the boronization pressure from 2 to 5 to 10 mTorr
-------------------------------------------------------------------------------

Physics Operators Plans
Entered: Apr 20 2006 04:43:04:763PM
Author: Joseph Snipes
Engineering setup for Friday 21-April-2006

MP330 Localization of the effect of Boronization

Session leader: Wukitch
Physics operator: Snipes

Overnight ECDC in D2, and bake at 60 C.
ECDC post RF conditioning before run.

Run begins at 09:00 and ends at 17:00

Power systems as on 1060407007 (1.0 MA fiducial, 5.4 T, LSN)

A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled.

Gas Setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar + 2 psi Ne Hybrid DISABLED (PG1)
fill B-side upper as is, Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
fill NINJA with 12 psi D2 Enabled

*** Boronization system set up for between-shot boronization before
the run but do not open the diborane bottle.

*** All between shot boronizations (BSB) 10 minutes. Each sweep 200
seconds with a 20 second pause. All sweeps are 65-75 cm with pause
at 70 cm. Boronization pressure set to 5 mTorr.

Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo shutters; these must be disabled for between-shot boronization

The A-Side TV camera shutter must be CLOSED before the boronizations
(before the run and for the rest of the day).
The MSE shutter must be CLOSED before the start of the run, and remain closed
throughout the day.

Important Diagnostics: standard impurity spectroscopy, Mo source
monitor, McPherson, emissive probe

-------------------------------------------------------------------------------
ICRF Setup: FMIT#1&2 in run-on by 8:30.
FMIT#3&4 in run-on by 7:30.
-------------------------------------------------------------------------------
Plan: use 1 MA, 5.4 T, nl_04~1

A) Comparison of impurity sources and surface heating:
LSN - 2-3 shots with J, D/E at different times.
Compare IR, Chromex measurements of the K-div top.
USN - 2-3 shots (a recent USN discharge is 1060315022)

B) Boronization erosion dependence on antenna (8 shots + 4 BSB's)
1) BSB followed by a D/E heating shot
2) J heating shot
3) BSB followed by J heating shot
4) D/E heating shot
5) BSB followed by two D/E heated discharges
6) BSB followed by two J heated discharges

may repeat 1-4 depending upon results

C) Effect of density on boronization erosion.
scan target density nl04 = 0.6, 0.8, 1.2

D) Effect of diborane pressure on boronization.
Vary the boronization pressure from 2 to 5 to 10 mTorr

Session Leader Summaries
Entered: Apr 21 2006 05:08:56:003PM
Author: Steve Wukitch
Run Summary:

We made good progress with respect to localizing erosion to specific
antennas. The control room conclusion is that the antennas (where D+E
is loosely referred to as one antenna) erode the boronization at
specific locations. Using 2 MW injected ICRF power, the stored energy
peak is similar for consecutive discharges where each discharge uses a
different antenna. For example, discharges 011 used D+E and obtained
Wmhd~146 kJ and 012 used J and obtained 142 kJ. In addition, the post
boronization effect appeared to erode more slowly for J antenna
operation than D+E. As an aside, PCI observed set of modes near 1.5
MHz in USN H-mode on 005, 006, and 007.

Physics Operator Summaries
Entered: Apr 21 2006 05:07:46:583PM
Author: Joseph Snipes
The machine ran very well today with almost 100% startup reliability despite between-shot-boronization. The
experiment tested the difference in erosion of boronization between D&E ports and J-port ICRF. See the
session leader summary for details of the comparison. Good data were obtained. The startup reliability was
excellent until shot 23 and then there were two fizzles in a row after 10 minutes of boronization. There was
one more fizzle on shot 27 and the rest were long plasmas. There were two disruptions in the flattop due
apparently to impurity injections. The prepuff was set to 6 ms duration after each boronization based on
prior experience. There were some small changes in the vertical field and radial field that were tweaked
following the fizzles, but I suspect the changes in the gas evolving from the walls was more significant.
While the last two shots went, their startups do not look good, so they are rather marginal.
Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result
| 01 1.973 1.017 Plasma | 02 1.972 1.018 Plasma |
| 03 1.877 1.016 Plasma | 04 1.876 1.013 Plasma |
| 05 1.263 1.126 Plasma | 06 1.666 1.021 Plasma |
| 07 1.659 1.020 Plasma | 08 1.970 1.013 Plasma |
| 09 1.966 1.019 Plasma | 10 1.970 1.016 Plasma |
| 11 1.934 1.020 Plasma | 12 1.022 1.020 Plasma |
| 13 1.954 1.007 Plasma | 14 1.969 1.020 Plasma |
| 15 1.972 1.022 Plasma | 16 1.959 1.022 Plasma |
| 17 1.874 1.022 Plasma | 18 1.965 1.021 Plasma |
| 19 1.977 1.020 Plasma | 20 1.902 1.020 Plasma |
| 21 1.959 1.020 Plasma | 22 1.905 1.022 Plasma |
| 23 0.000 0.022 Fizzle | 24 0.000 0.022 Fizzle |
| 25 1.959 1.021 Plasma | 26 1.885 1.020 Plasma |
| 27 0.000 0.041 Fizzle | 28 1.962 1.023 Plasma |
| 29 1.962 1.031 Plasma
Date 1060421: 29 shots. 26 plasmas. 3 fizzles. 0 duds. 0 System Error.
(Plasma = Ip gt 50.0 kA Dud = H_alpha lt 0.40 V)
Total plasma duration: 48.35 s (exceeding -101 kA)

Session Leader Comments
Apr 21 2006 09:08:45:763AM1060421001Steve Wukitch001 ~5.4 T, 1 MA, nl04~0.8, LSN
D: 1 MW [0.7,1]sec
E: 1 MW [0.7,1]sec
J: 2 MW [[1.1,1.4]sec
result: plasma
D: ran
E: ran
J: max faults - marginal match on J3
next shot: repeat with improved match

Apr 21 2006 09:20:35:077AM1060421002Steve Wukitch002 ~5.4 T, 1 MA, nl04~0.8, LSN
D: 1 MW [0.7,1]sec
E: 1 MW [0.7,1]sec
J: 2 MW [1.1,1.4]sec
result: plasma
D: ran
E: ran
J: ran
next: reverse order of antennas and tweak match

Apr 21 2006 09:33:53:543AM1060421003Steve Wukitch003 ~5.4 T, 1 MA, nl04~0.8, LSN
D: 1 MW [1.1,1.4]sec
E: 1 MW [1.1,1.4]sec
J: 2 MW [0.7,1]sec
result: plasma
D: ran
E: ran
J: ran - 3 faults late
next: USN

Apr 21 2006 09:47:42:590AM1060421004Steve Wukitch004 ~5.4 T, 1 MA, nl04~0.8, USN
D: 1 MW [0.7,1]sec
E: 1 MW [0.7,1]sec
J: 2 MW [1.1,1.4]sec
result: plasma
D: ran - 7 faults
E: ran
J: ran - 1 fault
next: repeat w/ improved match
note: cell access to address IR camera issue

Apr 21 2006 10:07:36:497AM1060421005Steve Wukitch005 ~5.4 T, 1 MA, nl04~0.8, USN
D: 1 MW [1.1,1.4]sec
E: 1 MW [1.1,1.4]sec
J: 2 MW [0.7,1]sec
result: plasma - disruption (~1.25 sec)
D: ran
E: ran
J: ran

next: repeat
Apr 21 2006 10:25:13:187AM1060421006Steve Wukitch006 ~5.4 T, 1 MA, nl04~0.8, USN
D: 1 MW [1.1,1.4]sec
E: 1 MW [1.1,1.4]sec
J: 2 MW [0.7,1]sec
result: plasma
D: ran
E: ran
J: ran
next: repeat

Apr 21 2006 10:34:27:623AM1060421007Steve Wukitch007 ~5.4 T, 1 MA, nl04~0.8, USN
D: 1 MW [1.1,1.4]sec
E: 1 MW [1.1,1.4]sec
J: 2 MW [0.7,1]sec
result: plasma
D: ran
E: ran
J: ran 1 fault
next: LSN

Apr 21 2006 10:49:40:577AM1060421008Steve Wukitch008 ~5.4 T, 1 MA, nl04~0.8, LSN (recall 003)
D: 1 MW [1.1,1.4]sec
E: 1 MW [1.1,1.4]sec
J: 2 MW [0.7,1]sec
result: plasma
D: ran
E: ran 8 faults
J: ran 1 fault
next: 10 minute boronization
5 mTorr
sweep 200 seconds with a 20 second pause.
65-75 cm with pause at 70 cm.

Apr 21 2006 11:45:51:530AM1060421009Steve Wukitch009 ~5.4 T, 1 MA, nl04~0.8, LSN
D: 1 MW [0.7,1.2]sec
E: 1 MW [0.7,1.2]sec
result: plasma H mode
D: ran
E: ran 7 faults
note: faults on E probably result in lower W (137 kJ peak)
next: J antenna pulse

Apr 21 2006 11:47:26:077AM1060421010Steve Wukitch010 ~5.4 T, 1 MA, nl04~0.8, LSN
J: 2 MW [0.7,1.2]sec
result: plasma
J: ran 1 fault
note: 118 kJ
big injection at 0.8 sec
next: 10 minute boronization
5 mTorr
sweep 200 seconds with a 20 second pause
65-75 cm with pause at 70 cm
repeat 009-010 sequence

Apr 21 2006 12:19:02:653PM1060421011Steve Wukitch011 ~5.4 T, 1 MA, nl04~0.8, LSN
D: 1 MW [0.7,1.2]sec
E: 1 MW [0.7,1.2]sec
result: plasma H mode
D: ran 1 fault
E: ran
note: 146 kJ better than 009
next: J antenna pulse

Apr 21 2006 12:55:26:060PM1060421012Steve Wukitch012 ~5.4 T, 1 MA, nl04~0.8, LSN
J: 2 MW [0.7,1.2]sec
result: plasma early disruption
J: ran
note: 142 kJ
next: 10 minute boronization
5 mTorr
sweep 200 seconds with a 20 second pause
65-75 cm with pause at 70 cm
repeat sequence but antenna reverse order

Apr 21 2006 01:08:10:997PM1060421013Steve Wukitch013 ~5.4 T, 1 MA, nl04~0.8, LSN
J: 2 MW [0.7,1.2]sec
result: plasma
J: ran max faults
next: repeat - assume this weak effort did not remove boronization

Apr 21 2006 01:26:52:013PM1060421014Steve Wukitch014 ~5.4 T, 1 MA, nl04~0.8, LSN
J: 2 MW [0.7,1.2]sec
result: plasma
J: ran 1 fault
next: D+E pulse
note: 145 kJ early and 151 kJ at end
interesting Mo time history - about half way the Mo suddenly increased
interesting Prad time history

Apr 21 2006 01:43:09:933PM1060421015Steve Wukitch015 ~5.4 T, 1 MA, nl04~0.8, LSN
D: 1 MW [0.7,1.2]sec
E: 1 MW [0.7,1.2]sec
result: plasma H mode
D: ran
E: ran 8 faults
note: 133 kJ - injections
next: J pulse

Apr 21 2006 02:03:31:980PM1060421017Steve Wukitch017 ~5.4 T, 1 MA, nl04~0.8, LSN
J: 2 MW [0.7,1.2]sec
result: plasma
J: ran 2 faults
note: 144 kJ - boronization still hanging around
next: repeat

Apr 21 2006 02:13:48:247PM1060421018Steve Wukitch018 ~5.4 T, 1 MA, nl04~0.8, LSN
J: 2 MW [0.7,1.2]sec
result: plasma
J: ran 1 fault
note: 133 kJ - boronization is finally gone
next: 10 minute boronization
5 mTorr
sweep 200 seconds with a 20 second pause
65-75 cm with pause at 70 cm

Apr 21 2006 02:41:44:247PM1060421019Steve Wukitch019 ~5.4 T, 1 MA, nl04~0.8, LSN
D: 1 MW [0.7,1.2]sec
E: 1 MW [0.7,1.2]sec
result: plasma H mode
D: ran
E: ran
note: 145 kJ
next: repeat

Apr 21 2006 02:56:32:270PM1060421020Steve Wukitch020 ~5.4 T, 1 MA, nl04~0.8, LSN
D: 1 MW [0.7,1.2]sec
E: 1 MW [0.7,1.2]sec
result: plasma
D: ran 1 fault
E: ran 4 faults
note: 130 kJ - boronization fading
next: J pulse

Apr 21 2006 03:10:11:770PM1060421021Steve Wukitch021 ~5.4 T, 1 MA, nl04~0.8, LSN
J: 2 MW [0.7,1.2]sec
result: plasma
J: ran 1 fault
note: 134 kJ - injections and fault may have affect trajectory
next: repeat

Apr 21 2006 03:21:55:130PM1060421022Steve Wukitch022 ~5.4 T, 1 MA, nl04~0.8, LSN
J: 2 MW [0.7,1.2]sec
result: plasma
J: ran
note: 134 kJ
next: 10 minute boronization
5 mTorr
sweep 200 seconds with a 20 second pause
65-75 cm with pause at 70 cm

Apr 21 2006 03:46:46:910PM1060421023Steve Wukitchfizzle
Apr 21 2006 03:58:34:020PM1060421024Steve Wukitchfizzle
Apr 21 2006 04:13:46:630PM1060421025Steve Wukitch025 ~5.4 T, 1 MA, nl04~0.8, LSN
E: 1 MW [0.7,1.2]sec
J: 1 MW [0.7,1.2]sec
result: plasma
E: ran 2 faults
J: ran
note: 137 kJ
next: swap D for E

Apr 21 2006 04:27:55:067PM1060421026Steve Wukitch026 ~5.4 T, 1 MA, nl04~0.8, LSN
D: 1 MW [0.7,1.2]sec
J: 1 MW [0.7,1.2]sec
result: plasma
D: ran 1 fault
J: ran
note: 132 kJ
next: J only

Apr 21 2006 04:52:10:927PM1060421027Steve Wukitchfizzle
Apr 21 2006 05:09:29:007PM1060421029Steve Wukitch029 ~5.4 T, 1 MA, nl04~0.8, LSN
D: 1 MW [0.7,1.2]sec
E: 1 MW [0.7,1.2]sec
J: 2.5-3 MW [0.7,1.2]sec
result: plasma
D: ran
E: ran 8 faults - voltage is high
J: ran 2 faults
note: 185 kJ

Physics Operator Comments
Apr 21 2006 09:04:00:670AM1060421001Joseph SnipesShot 1: Copied shot 1060407007 a 1 MA, 5.4 T, SNL with nl04 set to 8 x 10^19 m^-2. Modified the TF to remove
the back porch that was there. Good shot.
Apr 21 2006 09:26:18:187AM1060421002Joseph SnipesShot 2: Increased prepuff by 2 ms to 21 ms duration. Good shot.
Apr 21 2006 09:29:12:480AM1060421003Joseph SnipesShot 3: Repeat. Good shot.
Apr 21 2006 09:41:42:153AM1060421004Joseph SnipesShot 4: Loaded shot 1060315022. Reloaded segment 1 from shot 1060421003. Segment 3 is the second active segment
for an USN 1 MA, 5.4 T plasma. Set nl04 to 8 x 10^19 m^-2. Removed the back porch on the TF in segment 3.
Good shot.
Apr 21 2006 10:02:58:590AM1060421005Joseph SnipesShot 5: Startup looked bad on shot 4 so I've increased the prepuff by 4 ms to 25 ms duration and raised the
EF4 current by 10 A to -1325 A. Raised nl04 to 9 x 10^19 m^-2. Disrupted at 1.26 s.
Apr 21 2006 10:19:55:263AM1060421006Joseph SnipesShot 6: Reduced ZXU from 0.005 to 0 throughout the flattop. Increased RXU from -0.02 to -0.01 throughout
the flattop. This shot and the previous have had what I believe are record elongations of 1.97 at 0.3 s. Good
shot but disrupted at 1.66 s.
Apr 21 2006 10:32:51:077AM1060421007Joseph SnipesShot 7: Reduced RCUR and CLEARIN after 1.5 s to attempt to improve the rampdown. Good shot but disrupted
again at 1.66 s.
Apr 21 2006 11:14:31:437AM1060421008Joseph SnipesShot 8: Reloaded shot 1060421003 which has segment 2 as the active second segment and has LSN. Reloaded
segment 1 from shot 1060421007. nl04 set to 8 x 10^19 m^-2. Runaways from 22 ms until 220 ms for some
reason. Otherwise, it is a decent shot.
Apr 21 2006 11:14:47:513AM1060421008Joseph SnipesBegin between-shot-boronization.
Apr 21 2006 11:28:43:840AM1060421009Joseph SnipesShot 9: Reduced prepuff to 6 ms duration expecting a lot of gas from the boronization. Good shot.
Apr 21 2006 11:40:57:670AM1060421010Joseph SnipesShot 10: Increased prepuff to 20 ms duration expecting less gas from the boronization. Good shot.
Apr 21 2006 11:46:48:640AM1060421010Joseph SnipesBegin 10 minute boronization again.
Apr 21 2006 12:16:23:857PM1060421011Joseph SnipesShot 11: Reduced prepuff to 6 ms duration. Good shot.
Apr 21 2006 12:25:54:403PM1060421012Joseph SnipesShot 12: Increased prepuff to 20 ms duration. Disrupted at 1.01 s.
Apr 21 2006 12:31:32:670PM1060421012Joseph SnipesBegin 10 minute boronization.
Apr 21 2006 01:01:08:280PM1060421013Joseph SnipesShot 13: Reduced prepuff to 6 ms duration. Good shot.
Apr 21 2006 01:09:54:060PM1060421014Joseph SnipesShot 14: Increased prepuff to 20 ms duration. Good shot.
Apr 21 2006 01:26:24:450PM1060421015Joseph SnipesShot 15: Repeat. Good shot.
Apr 21 2006 01:40:16:450PM1060421016Joseph SnipesShot 16: Repeat. Good shot.
Apr 21 2006 01:51:21:217PM1060421017Joseph SnipesShot 17: Repeat. Good shot.
Apr 21 2006 02:27:05:620PM1060421018Joseph SnipesBoronization for 10 minutes.
Apr 21 2006 02:42:38:567PM1060421019Joseph SnipesShot 19: Reduced prepuff to 6 ms duration. Good shot.
Apr 21 2006 02:52:48:847PM1060421020Joseph SnipesShot 20: Increased prepuff to 20 ms duration. Good shot.
Apr 21 2006 03:07:21:833PM1060421021Joseph SnipesShot 21: Repeat. Good shot.
Apr 21 2006 03:17:56:753PM1060421022Joseph SnipesShot 22: Repeat. Good shot.
Apr 21 2006 03:21:27:753PM1060421022Joseph SnipesBoronization for 10 minutes.
Apr 21 2006 03:46:18:957PM1060421023Joseph SnipesShot 23: Reduced prepuff to 6 ms duration. Fizzle!
Apr 21 2006 03:58:23:520PM1060421024Joseph SnipesShot 24: Returned prepuff to 20 ms duration. Fizzle again!
Apr 21 2006 04:10:45:880PM1060421025Joseph SnipesShot 25: Decreased EF4 current by 10 A to -1335 A. Try again. Good shot.
Apr 21 2006 04:28:26:427PM1060421026Joseph SnipesShot 26: Repeat. Good shot with striations along the inner wall in the WIDE2 camera view.
Apr 21 2006 04:36:13:160PM1060421027Joseph SnipesShot 27: Fizzle!
Apr 21 2006 04:48:48:393PM1060421028Joseph SnipesShot 28: Reduced Br0 by 0.5 mT to -0.0005 T and increased prepuff by 3 ms to 23 ms duration. Good shot.
Apr 21 2006 05:01:45:037PM1060421029Joseph SnipesShot 29: Returned to 20 ms prepuff. Good shot.

Engineering Operator Comments
ShotTimeTypeStatusComment
109:02:38:747AMPlasmaOk
209:15:02:043AMPlasmaOk
309:27:26:340AMPlasmaOk
409:39:59:153AMPlasmaOk
510:00:46:530AMPlasmaOk
610:16:54:670AMPlasmaOk
710:30:45:937AMPlasmaOk
810:43:07:420AMPlasmaOk
911:27:02:280AMPlasmaOk
1011:39:34:763AMPlasmaOk
1112:10:46:357PMPlasmaOk
1212:23:14:043PMPlasmaOk
1312:55:59:450PMPlasmaOk
1401:08:28:747PMPlasmaOk
1501:24:54:247PMPlasmaOk
1601:37:28:280PMPlasmaOk
1701:49:58:950PMPlasmaOk
1802:03:02:090PMPlasmaOk
1902:38:31:147PMPlasmaOk
2002:51:13:407PMPlasmaOk
2103:03:45:300PMPlasmaOk
2203:16:29:050PMPlasmaOk
2303:44:25:553PMPlasmaOk
2403:56:49:770PMPlasmaOk
2504:09:18:613PMPlasmaOk
2604:22:12:723PMPlasmaOk
2704:34:39:350PMPlasmaOk
2804:47:07:333PMPlasmaOk
2905:00:11:143PMPlasmaOk