Alcator C-Mod Run 1040211 Information

Miniproposals

Miniproposal: 388

Date Filed: 2/5/2004

Title: Plasma performance optimization by impurity control

First Author: Yijun Lin

Session Leader: Steve Wukitch (shots 1-23)

Session Leader: Yijun Lin (shots 1-23)

Operators
Session leader(s):	Steve Wukitch,Yijun Lin
Physics operator(s):	Dmitri Mossessian
Engineering operator(s):	Bill Parkin,Bill Byford,Gary Dekow

Engineering Operator Run Comment
MP388 SL: Wukitch/Lin PO: Mossessian EO: Dekow/Byford/Parkin

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:02:743PM

Author: Yijun Lin

Run summary: MP388 part 1
Purpose: vary gas puff in segment 1, plasma shape, puff nitrogen
to figure out whether they can affect plasma performance.
Result: None of these affect the performance.
1: gas puff in segment 1:
At higher gas puff rate, the soft xray signal
in early plasma is significantly lower. However, the
resulted plasma later is no difference.
(compare shot 14 and shot 15)
2. Plasma shape:
shot 10, 11, 12, 13 were trying to run plasmas farther
away from the BN tiles by reduce elongation and/or outer gap.
These changes resulted zero effect.
3. N2 puff. (shot 16-20)
With nitrogen level at about 5 time of the background
level (shot 19), there was still no effect on plasma
performance. Therefore, Nitrogen level (and possibly BN tiles)
may be ruled out as a major culprit of the performance
degradation.
One restraint for today's experiment is that we only had D and E
antennas, and the total rf power was at about 2-2.4 MW level. It would have
be better for the result if more power had been available. Anyhow, the
result made us think harder on the performance issue.
Generally, the plasmas were better than last pre-boronization run
(1040106). Boronization will follow this run (several low density shots
to unload the wall before boronization). The segment 1 gas puff effect
will be checked after the boronization.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:48:960PM

Author: Dmitri Mossessian

Physop summary for 1040211:

Plan:

Session leader: Wukitch - Lin
Physics operator: Mossessian

ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00.
Bake at 60 C overnight as well.

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

Power systems the same as 1040209001

A-coils as on 1040107004.

Gas setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid enabled (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill C-side with 30 psi D2 Hybrid enabled (PG3)

NINJA with 2 psi N2

Enable the following gate valves, assuming no vacuum problems:
ECE, VUV, DNB

Run plan:

Start with 1040209001, run RF. If RF works, run MP388:
Vary gas puff in segment 1 and monitor impurities and plasma
performance.
_____________________________________________________________________

Summary:

Good run from PO point of view. We started at 11:30 at RF people's request.
Had 24 shots, three data cycles - two at the beginning and one in the middle.
Shot number was not incremented for the cycle, so
there is a good shot #18 and a no shot #18. The last shot was the only fizzle.
Last three shots were low density cleaning shots.
No sturtup changes were necessary - plasma runs very smoothly.
For shots history see details below:

Details:

----------------------------------------------------------------------------
1040211003 mossessian PHYSICS_OPERATOR Feb 11 2004 11:56:26:743AM
. . . . . . . . . . . . . . . . . . . .
Plasma. Nice startup. 1 MW of RF from D -> multilpe H-modes

Next shot: no change
----------------------------------------------------------------------------
1040211004 mossessian PHYSICS_OPERATOR Feb 11 2004 12:22:51:233PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Same as 3.
----------------------------------------------------------------------------
1040211005 mossessian PHYSICS_OPERATOR Feb 11 2004 12:24:32:500PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Same as 3. Both pressure and CII is rising in startup shot to shot.

Next shot - no changes
----------------------------------------------------------------------------
1040211006 mossessian PHYSICS_OPERATOR Feb 11 2004 12:41:24:756PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Same as 5. Pressure and CII are back to normal.

Next shot - increase gas puff in segment 1 50% - PG_3 40 -> 60 between 0.03 and 0.1 sec
----------------------------------------------------------------------------
1040211007 mossessian PHYSICS_OPERATOR Feb 11 2004 1:03:05:500PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Next shot - PG_3 60 -> 80 between 0.03 and 0.1 sec in Segment1 and nl target up at 0.2 sec 5e19 -> 7e19 in Seg2
----------------------------------------------------------------------------
1040211008 mossessian PHYSICS_OPERATOR Feb 11 2004 1:17:50:010PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Next shot - PG3 to 100 (max value) in Seg1. nl target 8e19 -> 9e19 + 0.2 point up to 8e19 in Seg2
----------------------------------------------------------------------------
1040211009 mossessian PHYSICS_OPERATOR Feb 11 2004 1:36:19:423PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Similar to all shots before.

Next shot - ZXL 2 cm up, ZXU 2 cm down attempting to reduce elongation and keep
shape symmetric relative to the antenna.
----------------------------------------------------------------------------
1040211010 mossessian PHYSICS_OPERATOR Feb 11 2004 1:45:16:263PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Elongation ~ 1.56.

Next shot - Again ZXL 2 cm up, ZXU 2 cm down.
----------------------------------------------------------------------------
1040211011 mossessian PHYSICS_OPERATOR Feb 11 2004 2:06:19:350PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Elongation ~ 1.5.

Next shot - RCUR down 5 mm to increase outer gap 1 -> 2 cm
----------------------------------------------------------------------------
1040211012 mossessian PHYSICS_OPERATOR Feb 11 2004 2:09:24:350PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Right gap 1.7 cm.

Next shot - RCUR down 3 mm to increase left gap 1.7 -> 2.3 cm
----------------------------------------------------------------------------
1040211013 mossessian PHYSICS_OPERATOR Feb 11 2004 2:22:45:936PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Right gap 2.5 cm.

Next shot - reload seg2 from shot 3. Increase target to 0.9e20
----------------------------------------------------------------------------
1040211014 mossessian PHYSICS_OPERATOR Feb 11 2004 2:36:23:883PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Next shot - reload seg1 from shot 3.
----------------------------------------------------------------------------
1040211015 mossessian PHYSICS_OPERATOR Feb 11 2004 2:50:08:460PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Next shot - load shot 9. Set up N2 puff from NINJA
----------------------------------------------------------------------------
1040211016 mossessian PHYSICS_OPERATOR Feb 11 2004 3:42:55:546PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Next shot - no PCS changes. INcreasing N2 puff shot to shot
----------------------------------------------------------------------------
1040211017 mossessian PHYSICS_OPERATOR Feb 11 2004 3:43:42:830PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Next shot - no PCS changes. Increasing N2 puff shot to shot
----------------------------------------------------------------------------
1040211018 mossessian PHYSICS_OPERATOR Feb 11 2004 3:43:49:000PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Next shot - no PCS changes. Increasing N2 puff shot to shot
----------------------------------------------------------------------------
1040211018 mossessian PHYSICS_OPERATOR Feb 11 2004 4:00:58:276PM
. . . . . . . . . . . . . . . . . . . .
Data system cycle.
----------------------------------------------------------------------------
1040211019 mossessian PHYSICS_OPERATOR Feb 11 2004 4:14:43:426PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Next shot - no PCS changes. Continue N2 puff
----------------------------------------------------------------------------
1040211020 mossessian PHYSICS_OPERATOR Feb 11 2004 4:20:06:610PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Next shot - go to low density : turn nl target off at 200 ms.
----------------------------------------------------------------------------
1040211021 mossessian PHYSICS_OPERATOR Feb 11 2004 4:34:02:153PM
. . . . . . . . . . . . . . . . . . . .
Plasma. nl=4e19, some runaways at the end

Next shot - no changes
----------------------------------------------------------------------------
1040211022 mossessian PHYSICS_OPERATOR Feb 11 2004 4:53:04:506PM
. . . . . . . . . . . . . . . . . . . .
Plasma. nl=4e19, some runaways at the end

Next shot - A coil current 2000 -> 2500

Session Leader Comments

Feb 11 2004 10:52:59:550AM 1040211001 Yijun Lin No power cycle test.

Feb 11 2004 10:52:53:067AM 1040211002 Yijun Lin No power cycle test.

Feb 11 2004 01:09:06:043PM 1040211003 Yijun Lin Shot 3:
Request: load shot 1040209001
Plasma: Bt 5.4 T, 1 MA, nl04 = 0.8e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 3 MW. t = [0.65, 1.35] sec

Result: H-mode. E port mismatched.
Max gas puff rate (t < 0.1 sec) [torr-liter/sec]:
Before RF t @ max stored energy
time[sec]: 0.6 0.9
Prf [MW]: 0. 0.8
Wmhd[kj]: 46 84
dW/Prf[kj/MW]:N/A 50
H-factor: .82 1.4
Prad_main[MW]: 0.25 1.26
Zave: 1.7 1.8

Feb 11 2004 01:09:31:590PM 1040211004 Yijun Lin Shot 4:
Plasma: Bt 5.4 T, 1 MA, nl04 = 0.8e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 3 MW. t = [0.65, 1.35] sec

Result: H-mode. E port mismatched.
Max gas puff rate (t < 0.1 sec) [torr-liter/sec]:
Before RF t @ max stored energy
time[sec]: 0.6 0.83
Prf [MW]: 0. 1.2
Wmhd[kj]: 46 94
dW/Prf[kj/MW]:N/A 40
H-factor: .80 1.4
Prad_main[MW]: 0.29 1.72
Zave: 2.26 2.6

Feb 11 2004 12:31:00:670PM 1040211005 Yijun Lin Shot 5:
Plasma: Bt 5.4 T, 1 MA, nl04 = 0.8e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 2.5 MW. t = [0.65, 1.35] sec

Result: H-mode. E port mismatched.
Max gas puff rate (t < 0.1 sec) [torr-liter/sec]:
Before RF t @ max stored energy
time[sec]: 0.6 0.83
Prf [MW]: 0. 1.3-2.2 with E short pulses
Wmhd[kj]: 44 101
dW/Prf[kj/MW]:N/A ?
H-factor: .8 1.5
Prad_main[MW]: 0.25 1.36
Zave: 2.17 2.9

Feb 11 2004 01:04:34:983PM 1040211007 Yijun Lin shot 7
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.8e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 2.5 MW. t = [0.65, 1.35] sec

Result: H-modes.

Max gas puff rate (t < 0.1 sec) [torr-liter/sec]: 36
Soft x-ray raw: (array_3:chord_20*1e6): 115 @ 0.25 sec

Before RF t @ max stored energy
time[sec]: 0.6 0.75
Prf [MW]: 0 2.4
Wmhd[kj]: 47 107
dW/Prf[kj/MW]:N/A 25
H-factor: 0.8 1.15
Prad_main[MW]:0.27 2.2
Z_ave: 2.13 2.4

Not much change in plasma. The performance seems to be worse.
Next: More gas in segment 1 and also change density at segment 2 to
make it rise faster.

Feb 11 2004 01:38:40:453PM 1040211009 Yijun Lin shot 9:
Request:
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 2.5 MW. t = [0.65, 1.35] sec

Result: H-modes.

Max gas puff rate (t < 0.1 sec) [torr-liter/sec]:60
Soft x-ray raw: (array_3:chord_20*1e6):10

Before RF t @ max stored energy
time[sec]: 0.6 0.79
Prf [MW]: 0 2.2
Wmhd[kj]: 48 108
dW/Prf[kj/MW]:N/A 27.3
H-factor: 0.8 1-1.5
Prad_main[MW]:0.39 1.5
Z_ave: 2.0

soft xray is down more.
Next: reduce enlongation. Try to run plasma farther away from
any BN tiles.

Feb 11 2004 01:50:40:653PM 1040211010 Yijun Lin shot 10:
Request: (reduced enlongation kappa)
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.57, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec

Result: H-modes.

Max gas puff rate (t < 0.1 sec) [torr-liter/sec]: 60
Soft x-ray raw: (array_3:chord_20*1e6):10

Before RF t @ max stored energy
time[sec]: 0.6
Prf [MW]: 0 2.2
Wmhd[kj]: 46 114
dW/Prf[kj/MW]:N/A 31.
H-factor: .8 1.15-1.4
Prad_main[MW]:0.6 0.9
Z_ave: 2.0

2pi diode and soft x-ray both go down significantly in
the early part of the discharge since shot 8.
Next: reduce elongation more to see there is a trend.

Feb 11 2004 01:59:49:417PM 1040211011 Yijun Lin shot 11
Request: (reduced enlongation kappa more)
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.5, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec

Result: H-modes.

Max gas puff rate (t < 0.1 sec) [torr-liter/sec]: 60
Soft x-ray raw: (array_3:chord_20*1e6):10

Before RF t @ max stored energy
time[sec]: 0.6
Prf [MW]: 0 2.2
Wmhd[kj]: 47 111
dW/Prf[kj/MW]:N/A 29
H-factor: .8 1.15-1.4
Prad_main[MW]:? ?
Z_ave: 2.0

Change kappa seems to have little effect.
Next: increase outer gap to 2 cm. See whether there is difference
with this shape.

Feb 11 2004 02:18:44:517PM 1040211012 Yijun Lin shot 12
Request: (increased outer gap to 1.8 and kappa = 1.5)
Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.5, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1.8 cm.
RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec

Max gas puff in segment 1

Result: H-modes.

Max Wmhd at 115 kJ (better than last shot, but insignificant)
Max Hfactor at 1.47.
dW/Prf[kj/MW]: 33.

Next: Outer gap 5 mm more.

Feb 11 2004 02:38:38:510PM 1040211014 Yijun Lin shot 14: repeat of shot 9 (asked shot 3)
Plasma: Bt 5.4 T, 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec
Max gas puff.

result: H-modes
Max Wmhd at 106 kJ
Max Hfactor at 1.4.
dW/Prf[kj/MW]: 28.

Next: repeat shot 3 at nl04 = 0.9e20 m^-2

Feb 11 2004 02:53:24:160PM 1040211015 Yijun Lin shot 15: repeat of shot 3
Plasma: Bt 5.4 T, 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec

Gas puff in segment 1 is small.

result: H-modes
Max Wmhd at 109 kJ
Max Hfactor at 1.3.
dW/Prf[kj/MW]: 28.

The soft xray is back to 90 in the beginning.
But the performance later seemed not to be affected.
(Maybe we need a lot more power to see difference,
Wait for tomorrow).

Next: start N2 puff. Load shot 9.

Feb 11 2004 03:18:02:667PM 1040211016 Yijun Lin shot 16: repeat of shot 9 with N2 puff
Plasma: Bt 5.4 T, 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec

Max D puff in segment 1.
N2 puff (92 torr) at 0.4 s for 0.15 sec.

result: H-modes
Max Wmhd at 109 kJ
Max Hfactor at 1.4.
dW/Prf[kj/MW]: 28.

No evidence of Nitrogen puffed(J.T.)
Next: N2 puff (92 torr) at 0.4 sec for 0.4 sec

Feb 11 2004 03:24:15:007PM 1040211017 Yijun Lin shot 17: Try more N2 puff.
Plasma: Bt 5.4 T, 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec

Max D puff in segment 1.
N2 puff (92 torr) at 0.4 s for 0.4 sec.

result: H-modes
Max Wmhd at 112 kJ
Max Hfactor at 1.4.
dW/Prf[kj/MW]: 28.

Nitrogen level is up
Not much evidence on performance degradation.
Next: Up pressure and let more Nitrogen in.

Feb 11 2004 03:43:30:860PM 1040211018 Yijun Lin shot 18: Try more N2 puff.
Plasma: Bt 5.4 T, 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec

Max D puff in segment 1.
N2 puff (128 torr) at 0.4 s for 0.4 sec.

result: H-modes
Max Wmhd at 111 kJ
Max Hfactor at 1.4.
dW/Prf[kj/MW]: 28.
N2 is about 3 times of the background level.
No difference in performance.
Next: more N2 to make a difference.

Feb 11 2004 04:14:34:363PM 1040211019 Yijun Lin
shot 19: Try more N2 puff.
Plasma: Bt 5.4 T, 1 MA, nl04 = 0.9e20m^-2.
Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51,
outer gap ~ 1 cm.
RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec

Max D puff in segment 1.
N2 puff (288 torr) at 0.4 s for 0.4 sec.

result: H-modes
Max Wmhd at 112 kJ
Max Hfactor at 1.6.

Nitrogen at 5 times background level.
Still no effect.
Next: more N2 puff.

Feb 11 2004 04:40:08:400PM 1040211021 Jim Irby We are starting low density cleanup phase of run in preparation for boronization.

All gas being turned off at 200 ms.

Good shot --- lost it around 1.7 s --- runaways coming up at end of shot

Feb 11 2004 05:01:35:877PM 1040211022 Jim Irby repeat shot 21

looks good

Feb 11 2004 05:02:29:877PM 1040211023 Jim Irby fizzle --- EOT

Physics Operator Comments

Feb 11 2004 10:40:21:663AM 1040211002 Dmitri Mossessian Plan:

Session leader: Wukitch - Lin
Physics operator: Mossessian

ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00.
Bake at 60 C overnight as well.

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

Power systems the same as 1040209001

A-coils as on 1040107004.

Gas setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid enabled (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill C-side with 30 psi D2 Hybrid enabled (PG3)

NINJA with 2 psi N2

Enable the following gate valves, assuming no vacuum problems:
ECE, VUV, DNB

Run plan:

Start with 1040209001, run RF. If RF works, run MP388:
Vary gas puff in segment 1 and monitor impurities and plasma
performance.
_____________________________________________________________________

Loaded 1040209001.

Feb 11 2004 11:56:26:743AM 1040211003 Dmitri Mossessian Plasma. Nice startup. 1 MW of RF from D -> multilpe H-modes

Next shot: no change

Feb 11 2004 12:22:51:233PM 1040211004 Dmitri Mossessian Plasma. Same as 3.

Feb 11 2004 12:24:32:500PM 1040211005 Dmitri Mossessian Plasma. Same as 3. Both pressure and CII is rising in startup shot to shot.

Next shot - no changes

Feb 11 2004 12:41:24:757PM 1040211006 Dmitri Mossessian Plasma. Same as 5. Pressure and CII are back to normal.

Next shot - increase gas puff in segment 1 50% - PG_3 40 -> 60 between 0.03 and 0.1 sec

Feb 11 2004 01:03:05:500PM 1040211007 Dmitri Mossessian Plasma.

Next shot - PG_3 60 -> 80 between 0.03 and 0.1 sec in Segment1 and nl target up at 0.2 sec 5e19 -> 7e19 in Seg2

Feb 11 2004 01:17:50:010PM 1040211008 Dmitri Mossessian Plasma.

Next shot - PG3 to 100 (max value) in Seg1. nl target 8e19 -> 9e19 + 0.2 point up to 8e19 in Seg2

Feb 11 2004 01:36:19:423PM 1040211009 Dmitri Mossessian Plasma. Similar to all shots before.

Next shot - ZXL 2 cm up, ZXU 2 cm down attempting to reduce elongation and keep
shape symmetric relative to the antenna.

Feb 11 2004 01:45:16:263PM 1040211010 Dmitri Mossessian Plasma. Elongation ~ 1.56.

Next shot - Again ZXL 2 cm up, ZXU 2 cm down.

Feb 11 2004 02:06:19:350PM 1040211011 Dmitri Mossessian Plasma. Elongation ~ 1.5.

Next shot - RCUR down 5 mm to increase outer gap 1 -> 2 cm

Feb 11 2004 02:09:24:350PM 1040211012 Dmitri Mossessian Plasma. Right gap 1.7 cm.

Next shot - RCUR down 3 mm to increase left gap 1.7 -> 2.3 cm

Feb 11 2004 02:22:45:937PM 1040211013 Dmitri Mossessian Plasma. Right gap 2.5 cm.

Next shot - reload seg2 from shot 3. Increase target to 0.9e20

Feb 11 2004 02:36:23:883PM 1040211014 Dmitri Mossessian Plasma.

Next shot - reload seg1 from shot 3.

Feb 11 2004 02:50:08:460PM 1040211015 Dmitri Mossessian Plasma.

Next shot - load shot 9. Set up N2 puff from NINJA

Feb 11 2004 03:42:55:547PM 1040211016 Dmitri Mossessian Plasma.

Next shot - no PCS changes. INcreasing N2 puff shot to shot

Feb 11 2004 03:43:42:830PM 1040211017 Dmitri Mossessian Plasma.

Next shot - no PCS changes. Increasing N2 puff shot to shot

Feb 11 2004 03:43:49:000PM 1040211018 Dmitri Mossessian Plasma.

Next shot - no PCS changes. Increasing N2 puff shot to shot

Feb 11 2004 04:00:58:277PM 1040211018 Dmitri Mossessian Data system cycle.

Feb 11 2004 04:14:43:427PM 1040211019 Dmitri Mossessian Plasma.

Next shot - no PCS changes. Continue N2 puff

Feb 11 2004 04:20:06:610PM 1040211020 Dmitri Mossessian Plasma.

Next shot - go to low density : turn nl target off at 200 ms.

Feb 11 2004 04:34:02:153PM 1040211021 Dmitri Mossessian Plasma. nl=4e19, some runaways at the end

Next shot - no changes

Feb 11 2004 04:53:04:507PM 1040211022 Dmitri Mossessian Plasma. nl=4e19, some runaways at the end

Next shot - A coil current 2000 -> 2500

Engineering Operator Comments

Shot Time Type Status Comment

1 09:10:58:540AM Test Ok

2 09:24:40:693AM Test Ok

3 11:51:40:370AM Plasma Ok

4 12:05:25:163PM Plasma Ok

5 12:20:28:313PM Plasma Ok

6 12:35:09:730PM Plasma Ok

7 12:52:06:847PM Plasma Ok

8 01:07:54:827PM Plasma Ok

9 01:20:35:383PM Plasma Ok

10 01:36:44:987PM Plasma Ok

11 01:49:32:763PM Plasma Ok

12 02:02:53:460PM Plasma Ok

13 02:17:43:440PM Plasma Ok

14 02:31:01:480PM Plasma Ok

15 02:44:14:193PM Plasma Ok

16 02:57:32:533PM Plasma Ok

17 03:15:49:700PM Plasma Ok

18 03:31:58:240PM Plasma Ok

19 04:02:05:120PM Plasma Ok

20 04:15:46:783PM Plasma Ok

21 04:28:44:937PM Plasma Ok

22 04:44:04:180PM Plasma Ok

23 04:56:30:690PM Plasma Ok

Session Leader Comments
Feb 11 2004 10:52:59:550AM	1040211001	Yijun Lin	No power cycle test.
Feb 11 2004 10:52:53:067AM	1040211002	Yijun Lin	No power cycle test.
Feb 11 2004 01:09:06:043PM	1040211003	Yijun Lin	Shot 3: Request: load shot 1040209001 Plasma: Bt 5.4 T, 1 MA, nl04 = 0.8e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 3 MW. t = [0.65, 1.35] sec Result: H-mode. E port mismatched. Max gas puff rate (t < 0.1 sec) [torr-liter/sec]: Before RF t @ max stored energy time[sec]: 0.6 0.9 Prf [MW]: 0. 0.8 Wmhd[kj]: 46 84 dW/Prf[kj/MW]:N/A 50 H-factor: .82 1.4 Prad_main[MW]: 0.25 1.26 Zave: 1.7 1.8
Feb 11 2004 01:09:31:590PM	1040211004	Yijun Lin	Shot 4: Plasma: Bt 5.4 T, 1 MA, nl04 = 0.8e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 3 MW. t = [0.65, 1.35] sec Result: H-mode. E port mismatched. Max gas puff rate (t < 0.1 sec) [torr-liter/sec]: Before RF t @ max stored energy time[sec]: 0.6 0.83 Prf [MW]: 0. 1.2 Wmhd[kj]: 46 94 dW/Prf[kj/MW]:N/A 40 H-factor: .80 1.4 Prad_main[MW]: 0.29 1.72 Zave: 2.26 2.6
Feb 11 2004 12:31:00:670PM	1040211005	Yijun Lin	Shot 5: Plasma: Bt 5.4 T, 1 MA, nl04 = 0.8e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 2.5 MW. t = [0.65, 1.35] sec Result: H-mode. E port mismatched. Max gas puff rate (t < 0.1 sec) [torr-liter/sec]: Before RF t @ max stored energy time[sec]: 0.6 0.83 Prf [MW]: 0. 1.3-2.2 with E short pulses Wmhd[kj]: 44 101 dW/Prf[kj/MW]:N/A ? H-factor: .8 1.5 Prad_main[MW]: 0.25 1.36 Zave: 2.17 2.9
Feb 11 2004 01:04:34:983PM	1040211007	Yijun Lin	shot 7 Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.8e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 2.5 MW. t = [0.65, 1.35] sec Result: H-modes. Max gas puff rate (t < 0.1 sec) [torr-liter/sec]: 36 Soft x-ray raw: (array_3:chord_20*1e6): 115 @ 0.25 sec Before RF t @ max stored energy time[sec]: 0.6 0.75 Prf [MW]: 0 2.4 Wmhd[kj]: 47 107 dW/Prf[kj/MW]:N/A 25 H-factor: 0.8 1.15 Prad_main[MW]:0.27 2.2 Z_ave: 2.13 2.4 Not much change in plasma. The performance seems to be worse. Next: More gas in segment 1 and also change density at segment 2 to make it rise faster.
Feb 11 2004 01:38:40:453PM	1040211009	Yijun Lin	shot 9: Request: Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 2.5 MW. t = [0.65, 1.35] sec Result: H-modes. Max gas puff rate (t < 0.1 sec) [torr-liter/sec]:60 Soft x-ray raw: (array_3:chord_20*1e6):10 Before RF t @ max stored energy time[sec]: 0.6 0.79 Prf [MW]: 0 2.2 Wmhd[kj]: 48 108 dW/Prf[kj/MW]:N/A 27.3 H-factor: 0.8 1-1.5 Prad_main[MW]:0.39 1.5 Z_ave: 2.0 soft xray is down more. Next: reduce enlongation. Try to run plasma farther away from any BN tiles.
Feb 11 2004 01:50:40:653PM	1040211010	Yijun Lin	shot 10: Request: (reduced enlongation kappa) Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.57, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec Result: H-modes. Max gas puff rate (t < 0.1 sec) [torr-liter/sec]: 60 Soft x-ray raw: (array_3:chord_20*1e6):10 Before RF t @ max stored energy time[sec]: 0.6 Prf [MW]: 0 2.2 Wmhd[kj]: 46 114 dW/Prf[kj/MW]:N/A 31. H-factor: .8 1.15-1.4 Prad_main[MW]:0.6 0.9 Z_ave: 2.0 2pi diode and soft x-ray both go down significantly in the early part of the discharge since shot 8. Next: reduce elongation more to see there is a trend.
Feb 11 2004 01:59:49:417PM	1040211011	Yijun Lin	shot 11 Request: (reduced enlongation kappa more) Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.5, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec Result: H-modes. Max gas puff rate (t < 0.1 sec) [torr-liter/sec]: 60 Soft x-ray raw: (array_3:chord_20*1e6):10 Before RF t @ max stored energy time[sec]: 0.6 Prf [MW]: 0 2.2 Wmhd[kj]: 47 111 dW/Prf[kj/MW]:N/A 29 H-factor: .8 1.15-1.4 Prad_main[MW]:? ? Z_ave: 2.0 Change kappa seems to have little effect. Next: increase outer gap to 2 cm. See whether there is difference with this shape.
Feb 11 2004 02:18:44:517PM	1040211012	Yijun Lin	shot 12 Request: (increased outer gap to 1.8 and kappa = 1.5) Plasma: Bt = 5.4 T, Ip = 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.5, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1.8 cm. RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec Max gas puff in segment 1 Result: H-modes. Max Wmhd at 115 kJ (better than last shot, but insignificant) Max Hfactor at 1.47. dW/Prf[kj/MW]: 33. Next: Outer gap 5 mm more.
Feb 11 2004 02:38:38:510PM	1040211014	Yijun Lin	shot 14: repeat of shot 9 (asked shot 3) Plasma: Bt 5.4 T, 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec Max gas puff. result: H-modes Max Wmhd at 106 kJ Max Hfactor at 1.4. dW/Prf[kj/MW]: 28. Next: repeat shot 3 at nl04 = 0.9e20 m^-2
Feb 11 2004 02:53:24:160PM	1040211015	Yijun Lin	shot 15: repeat of shot 3 Plasma: Bt 5.4 T, 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec Gas puff in segment 1 is small. result: H-modes Max Wmhd at 109 kJ Max Hfactor at 1.3. dW/Prf[kj/MW]: 28. The soft xray is back to 90 in the beginning. But the performance later seemed not to be affected. (Maybe we need a lot more power to see difference, Wait for tomorrow). Next: start N2 puff. Load shot 9.
Feb 11 2004 03:18:02:667PM	1040211016	Yijun Lin	shot 16: repeat of shot 9 with N2 puff Plasma: Bt 5.4 T, 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec Max D puff in segment 1. N2 puff (92 torr) at 0.4 s for 0.15 sec. result: H-modes Max Wmhd at 109 kJ Max Hfactor at 1.4. dW/Prf[kj/MW]: 28. No evidence of Nitrogen puffed(J.T.) Next: N2 puff (92 torr) at 0.4 sec for 0.4 sec
Feb 11 2004 03:24:15:007PM	1040211017	Yijun Lin	shot 17: Try more N2 puff. Plasma: Bt 5.4 T, 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec Max D puff in segment 1. N2 puff (92 torr) at 0.4 s for 0.4 sec. result: H-modes Max Wmhd at 112 kJ Max Hfactor at 1.4. dW/Prf[kj/MW]: 28. Nitrogen level is up Not much evidence on performance degradation. Next: Up pressure and let more Nitrogen in.
Feb 11 2004 03:43:30:860PM	1040211018	Yijun Lin	shot 18: Try more N2 puff. Plasma: Bt 5.4 T, 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec Max D puff in segment 1. N2 puff (128 torr) at 0.4 s for 0.4 sec. result: H-modes Max Wmhd at 111 kJ Max Hfactor at 1.4. dW/Prf[kj/MW]: 28. N2 is about 3 times of the background level. No difference in performance. Next: more N2 to make a difference.
Feb 11 2004 04:14:34:363PM	1040211019	Yijun Lin	shot 19: Try more N2 puff. Plasma: Bt 5.4 T, 1 MA, nl04 = 0.9e20m^-2. Shape: LSN, Kappa = 1.65, delta_u = 0.28, delta_l = 0.51, outer gap ~ 1 cm. RF power: D + E = 2.2 MW. t = [0.65, 1.35] sec Max D puff in segment 1. N2 puff (288 torr) at 0.4 s for 0.4 sec. result: H-modes Max Wmhd at 112 kJ Max Hfactor at 1.6. Nitrogen at 5 times background level. Still no effect. Next: more N2 puff.
Feb 11 2004 04:40:08:400PM	1040211021	Jim Irby	We are starting low density cleanup phase of run in preparation for boronization. All gas being turned off at 200 ms. Good shot --- lost it around 1.7 s --- runaways coming up at end of shot
Feb 11 2004 05:01:35:877PM	1040211022	Jim Irby	repeat shot 21 looks good
Feb 11 2004 05:02:29:877PM	1040211023	Jim Irby	fizzle --- EOT

Physics Operator Comments
Feb 11 2004 10:40:21:663AM	1040211002	Dmitri Mossessian	Plan: Session leader: Wukitch - Lin Physics operator: Mossessian ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight as well. Run begins at 09:00 and ends at 17:00. Power systems the same as 1040209001 A-coils as on 1040107004. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) NINJA with 2 psi N2 Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB Run plan: Start with 1040209001, run RF. If RF works, run MP388: Vary gas puff in segment 1 and monitor impurities and plasma performance. _____________________________________________________________________ Loaded 1040209001.
Feb 11 2004 11:56:26:743AM	1040211003	Dmitri Mossessian	Plasma. Nice startup. 1 MW of RF from D -> multilpe H-modes Next shot: no change
Feb 11 2004 12:22:51:233PM	1040211004	Dmitri Mossessian	Plasma. Same as 3.
Feb 11 2004 12:24:32:500PM	1040211005	Dmitri Mossessian	Plasma. Same as 3. Both pressure and CII is rising in startup shot to shot. Next shot - no changes
Feb 11 2004 12:41:24:757PM	1040211006	Dmitri Mossessian	Plasma. Same as 5. Pressure and CII are back to normal. Next shot - increase gas puff in segment 1 50% - PG_3 40 -> 60 between 0.03 and 0.1 sec
Feb 11 2004 01:03:05:500PM	1040211007	Dmitri Mossessian	Plasma. Next shot - PG_3 60 -> 80 between 0.03 and 0.1 sec in Segment1 and nl target up at 0.2 sec 5e19 -> 7e19 in Seg2
Feb 11 2004 01:17:50:010PM	1040211008	Dmitri Mossessian	Plasma. Next shot - PG3 to 100 (max value) in Seg1. nl target 8e19 -> 9e19 + 0.2 point up to 8e19 in Seg2
Feb 11 2004 01:36:19:423PM	1040211009	Dmitri Mossessian	Plasma. Similar to all shots before. Next shot - ZXL 2 cm up, ZXU 2 cm down attempting to reduce elongation and keep shape symmetric relative to the antenna.
Feb 11 2004 01:45:16:263PM	1040211010	Dmitri Mossessian	Plasma. Elongation ~ 1.56. Next shot - Again ZXL 2 cm up, ZXU 2 cm down.
Feb 11 2004 02:06:19:350PM	1040211011	Dmitri Mossessian	Plasma. Elongation ~ 1.5. Next shot - RCUR down 5 mm to increase outer gap 1 -> 2 cm
Feb 11 2004 02:09:24:350PM	1040211012	Dmitri Mossessian	Plasma. Right gap 1.7 cm. Next shot - RCUR down 3 mm to increase left gap 1.7 -> 2.3 cm
Feb 11 2004 02:22:45:937PM	1040211013	Dmitri Mossessian	Plasma. Right gap 2.5 cm. Next shot - reload seg2 from shot 3. Increase target to 0.9e20
Feb 11 2004 02:36:23:883PM	1040211014	Dmitri Mossessian	Plasma. Next shot - reload seg1 from shot 3.
Feb 11 2004 02:50:08:460PM	1040211015	Dmitri Mossessian	Plasma. Next shot - load shot 9. Set up N2 puff from NINJA
Feb 11 2004 03:42:55:547PM	1040211016	Dmitri Mossessian	Plasma. Next shot - no PCS changes. INcreasing N2 puff shot to shot
Feb 11 2004 03:43:42:830PM	1040211017	Dmitri Mossessian	Plasma. Next shot - no PCS changes. Increasing N2 puff shot to shot
Feb 11 2004 03:43:49:000PM	1040211018	Dmitri Mossessian	Plasma. Next shot - no PCS changes. Increasing N2 puff shot to shot
Feb 11 2004 04:00:58:277PM	1040211018	Dmitri Mossessian	Data system cycle.
Feb 11 2004 04:14:43:427PM	1040211019	Dmitri Mossessian	Plasma. Next shot - no PCS changes. Continue N2 puff
Feb 11 2004 04:20:06:610PM	1040211020	Dmitri Mossessian	Plasma. Next shot - go to low density : turn nl target off at 200 ms.
Feb 11 2004 04:34:02:153PM	1040211021	Dmitri Mossessian	Plasma. nl=4e19, some runaways at the end Next shot - no changes
Feb 11 2004 04:53:04:507PM	1040211022	Dmitri Mossessian	Plasma. nl=4e19, some runaways at the end Next shot - A coil current 2000 -> 2500

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:10:58:540AM	Test	Ok
2	09:24:40:693AM	Test	Ok
3	11:51:40:370AM	Plasma	Ok
4	12:05:25:163PM	Plasma	Ok
5	12:20:28:313PM	Plasma	Ok
6	12:35:09:730PM	Plasma	Ok
7	12:52:06:847PM	Plasma	Ok
8	01:07:54:827PM	Plasma	Ok
9	01:20:35:383PM	Plasma	Ok
10	01:36:44:987PM	Plasma	Ok
11	01:49:32:763PM	Plasma	Ok
12	02:02:53:460PM	Plasma	Ok
13	02:17:43:440PM	Plasma	Ok
14	02:31:01:480PM	Plasma	Ok
15	02:44:14:193PM	Plasma	Ok
16	02:57:32:533PM	Plasma	Ok
17	03:15:49:700PM	Plasma	Ok
18	03:31:58:240PM	Plasma	Ok
19	04:02:05:120PM	Plasma	Ok
20	04:15:46:783PM	Plasma	Ok
21	04:28:44:937PM	Plasma	Ok
22	04:44:04:180PM	Plasma	Ok
23	04:56:30:690PM	Plasma	Ok