Alcator C-Mod Run 950426 Information

Miniproposals

Miniproposal:

Date Filed:

Title:

First Author:

Session Leader: Bruce Lipschultz (shots 1-35)

Operators
Session leader(s):	Bruce Lipschultz
Physics operator(s):	John Goetz
Engineering operator(s):	Vinny Bertolino,Joe Daigle

Engineering Operator Run Comment
X-pt

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:13:570PM

Author: To Be Determined

Run 950426

Engineering operator: V. Bertolino/J. Daigle
Phyics operator: J. Goetz
Session leader: BLip

Mini-proposal #109: "Further investigation of the x-point".
Most of the run was used to finish wavelength and spatial scans started
yesterday. The Chromex spectrograph covered the spectrum from 400 nm to
1300 nm for 14 different spatial locations (5 looking at the outer divertor,
8 looking at the inner divertor and 1 from K-top viewing the whole floor
of the machine). The McPherson view was scanned across the x-point for
2 different wavelength settings (C-V & C-VI in one case, C-III & LyBeta &
O-VI for the other case).
After the scans described above were completed, the x-point
radial location was scanned from 54 to 57 cm with diagnostic settings
held fixed. The goal here was to see if the x-point location affects the
radiation pattern (most specifically for the divertor bolo array).
During all these shots the RF was pulsed from approx. .9 to 1.1
seconds. For many shots H-mode was obtained. During H-mode phase the
moly levels in the plasma increased by factors of 5 or greater (increases
were not large during the rf before H-mode). The power into the SOL
decreased to pre-RF levels (due to increased moly radiation)
with the result that the divertor looked detached.
Towards the end of the run the RF power was lowered from 2 to 1 MW.
We then had much higher powers flowing into the SOL in the non H-mode cases.
H-modes occurred at the end of the RF pulse for the low power (1 MW) cases.
The density at this time was
nl04=1.4e20. This indicates a low threshold for RF H-mode.

- Bolometer inversion in the divertor was seen to be trustworthy.
Radiation follows the x-point and doesn't stay with a pixel.
Radiation stays at the x-point through detachment
for the case of the x-point far from inner divertor.
For the opposite case (x-point near
inner divertor) the radiation peak is at smaller major radius than the x-point
before detachment and shifts inside x-point after detachment.

- Deuterium Paschen series lines were investigated. These lines are
Stark-broadened and should allow density measurement. The Stark
broadened widths are approx 30 Angstroms.

- C-VI and C-V emission indicated heating at the x-point during RF. C-III,
Ly-Beta and O-VI emissions at the x-point are strongly affected by the H-mode.
This could be due to profile or density effects.

- The Mo-I emission is primarily found only at the outer divertor (not the
inner divertor) and then only at low densities.

- The CD band emssion in the divertor was measured. Spatial profiles were
obtained.

The shot summary follows:

shot 1: fizzle

shot 2: repeat of shot 34 from yesterday. All seemed to be fine. Strike
point position just below probe 7. nl04 peaking at ~ 1.5 e20.

shot 3 & 4: fizzle

shot 5: shot went ok. H-mode during RF (.9 - 1.05 seconds) wtih ~ 2.5 MW.
nl04 jumps up to about 2e20 during H-mode, 1.5e20 before.

shot 6: fizzle

shot 7: H-mode again w/ 2.5 MW.

shot 8: H-mode starting at 1.0 sec. Slightly more than 2 MW. Measurements
with the MacPherson indicate that CVI emission at the x-point increases
by a factor of 15 during the RF pulse.

shot 9: H-mode around .95 seconds.

shot 10: H-mode at .95 seconds. 2.2 MW

shot 11: Turned off the gas early to try and compensate for the density
rise during RF. RF had difficulty with tuning.

shot 12: 1.1 MW of RF. No H-mode. density lower as well. We will try to
bring the density back

shot 13: Back to H-mode with RF power slightly over 2MW.

shot 14: RF faulted on this shot. Divertor quite detached without RF.

shot 15: disruptive mess

shot 16: 2 MW RF, H-mode at .92 seconds. Lots of radiated power during
H-mode.

shot 17: 1 MW of RF, no H-mode.

shot 18: 2.2 MW RF w/H-mode.

shot 19: probe scan on this shot. 2 MW of RF, H-mode.

shot 20: Rf tripped, density stayed constant at nl04=1.35e20. Probe scan.

shot 21: 2 MW RF power, H-mode. Probe scan.

shot 22: x-point moved 1-2 mm. RF fired and usual H-mode. No probe scan.

shot 23: Shifted x-point out another 3 mm to R=56.3. No probe scan.
RF power of 2 MW with H-mode.

shot 24: Same as 23 but with probe scan. RF power of 2 MW. x-point at 56.4 cm.

shot 25: RF faulted. no probe scan. x-point at R=56.8.

shot 26: 1 MW RF with H-mode occuring only when RF turned off. No probe
scan. X-point at 57.5 cm.

shot 27: 1 MW RF again with H-mode as RF turns off. No probe scan. X-point
at R=55.5.

shot 28: 1 MW RF, same as previous shots. x-point at R=54.7.

shot 29: x-point at R=54.0. 1 MW RF. End of x-point run.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:54:037PM

Author: To Be Determined

Physics operator summary for 950426

EO: Bertolino/Daigle
PO: Goetz
SL: Lipschultz

Run 950426 was in support of Mini-Proposal 109 - Continued Investigation of the
X-point Region in a Single Null Configuration. The purpose of this MP is to
continue investigations of the plasma characteristics in the region around the
X-point in a number of plasma regimes (sheath-limited, high-recycling, detached,
and RF heated).

Setup:
Load 950425034
No changes
Coldstart hybrid - all matrices respond
P_0 = 2.3e-5

Run Plan:
This will be a continuation of run 950425. The run plan as outlined
in the log under 950425 is:
1 - Get a discharge with the right characteristics.
Check outer strike and adjust ZXL to get it
on or below probe 7.
2 - Run 4 shots for spectroscopic scan of H_2 lines
3 - Switch to D_2 and turn on RF at 0.9sec. Spectroscopy
scan for 14 shots.
4 - Scan McPherson across x-point.
5 - Scan x-point in major radius.
Run 950426 will begin at step 4.

This program was completely carried out. See the Session Leader's summary to
find out the details of the physics aspects of the run. The last one and
one-half hours were used as preliminary time for Run 950427 - MP#081.

Some thoughts from today:
-The CII light levels started off very high today; often greater than
0.01 mW/ster/cm^2. By the end of the run the level was at or below
0.002 which is considered normal. At this level the quality of the
null could be poor and a good startup was still achieved.
-A Br twiddle and a Bz twiddle were performed at the beginning of the
run. The fill pressure was dropped from 2.3e-5 to 1.9e-5 (where it
remained for the rest of the day) between shots 001 and 006. It is
probably the decreasing amount of CII light during startup that allowed
26 shots in a row to go.
-Shot 015 disrupted early due to repeated molybdenum injections.

Engineering, computing, and diagnostics today: EF2 power supply problem led
to a dud on shot 033. Otherwise, all performed well.

Scorecard: 35 shots = 30 plasmas + 4 fizzles + 1 dud

Shot summary for Run 950426
coldstart hybrid - all matrices respond
2 hours of D2 ECDC prior to the run
See above setup for starting information
P_0 = 2.3e-5

Shot change result
____ _____ ______
1 see above fizzle - CII light > 0.01

2 P_0 = 2.1e-5 plasma - disr. @ 1.27
CII light still = .01

3 slow down CLEARIN ramp; ZXU=+.04 @ 1. fizzle - CII light = .007

4 BR_0 offset = 6.0e-3 fizzle - radial field problem

5 BR_0 offset = 7.0e-3 plasma - disr. @ 1.27

6 ramp RCUR in faster; ZXU=+.0425 fizzle - CII light=.008

7 IC_EF4=-1080A; P_0=1.9e-5 plasma - disr. @ 1.28 ; CII=.004

8 ZXU = +.0475 plasma - disr. @ 1.28

9 RXU = -.03 plasma - disr. @ 1.30

10 RXU = -.02 plasma - disr. @ 1.30

11 RXU = -.01; NL04=0 @ 0.8sec plasma - disr. @ 1.35

12 no changes plasma - disr. @ 1.35

13 NL04=0 @ 1.0sec plasma - disr. @ 1.30

14 no changes plasma - disr. @ 1.22 - no RF

15 no changes plasma - disr. @ 0.45
multiple Mo injections @ 0.4

16 refill A_SIDE plenum to 19PSIA plasma - disr. @ 1.29

17 no changes plasma - disr. @ 1.21

18 no changes plasma - disr. @ 1.29

19 no changes plasma - disr. @ 1.30

20 no changes plasma - disr. @ 1.21

21 no changes plasma - disr. @ 1.31

22 RXL = +2e-3 from 0.7 to 1.0sec plasma - disr. @ 1.31
RXL out by 1 - 2mm (not 5)

23 RXL=+4e-3 and P gain = 4 @ 0.55sec plasma - disr. @ 1.31; RXL=56.4

24 ramp CLEARIN faster plasma - disr. @ 1.28; RXL=56.3

25 RXL = +1e-2 plasma - disr. @ 1.26; RXL=56.8

26 RXL = +1.8e-2 plasma - disr. @ 1.28; RXL=57.5

27 RXL = -5e-3 plasma - disr. @ 1.30; RXL=55.5

28 RXL=-13e-3 plasma - disr. @ 1.30; RXL=54.7

29 RXL=-20e-3 plasma - disr. @ 1.30; RXL~54.0

30 end of MP#109; start MP#081; RXL=0; plasma - disr. @ 1.43; o.gap=1.6
NL04=1e20; RCUR=0.669

31 no changes plasma - disr. @ 0.81; 2nd pel

32 RCUR = 0.671 plasma - disr. @ 1.28; o.gap=1.5

33 RCUR = 0.673 -> 0.675 dud - EF2 power supply problem

34 no changes plasma - disr. @ 1.34

35 ramp Ip from 0.8 to 1.0MA @ 0.54sec plasma - disr. @ 1.37

Session Leader Comments

Apr 26 1995 08:33:31:540AM Bruce Lipschultz Run 950426

Engineering operator: V. Bertolino/J. Daigle
Phyics operator: J. Goetz
Session leader: BLip

Mini-proposal #109: "Further investigation of the x-point". We plan
to complete the program started yesterday. This involves several more
points in a spectral scan and then a scan of the x-point to determine
the effect on x-point emission, inner divertor and detachment characteristics.

Apr 26 1995 09:00:07:740AM 950426002 Bruce Lipschultz Run 950426

shot 1: fizzle

shot 2: repeat of shot 34 from yesterday. All seemed to be fine. Strike
point position just below probe 7. nl04 peaking at ~ 1.5 e20.

Apr 26 1995 09:37:28:120AM 950426005 Bruce Lipschultz shot 3&4: fizzle

shot 5: shot went ok. H-mode during RF (.9 - 1.05 seconds) wtih ~ 2.5 MW.
nl04 jumps up to about 2e20 during H-mode, 1.5e20 before.

Apr 26 1995 10:10:08:580AM 950426005 Bruce Lipschultz shot 6: fizzle

shot 7: H-mode again w/ 2.5 MW.

Apr 26 1995 10:32:59:110AM 950426008 Bruce Lipschultz shot 8: H-mode starting at 1.0 sec. Slightly more than 2 MW. Measurements
with the MacPherson indicate that CVI emission at the x-point increases
by a factor of 15 during the RF pulse.

Apr 26 1995 10:52:28:280AM 950426009 Bruce Lipschultz shot 9: H-mode around .95 seconds.

Apr 26 1995 10:56:30:580AM 950426010 Bruce Lipschultz shot 10: H-mode at .95 seconds. 2.2 MW

Apr 26 1995 10:56:51:980AM 950426010 Bruce Lipschultz shot 10: H-mode at .95 seconds. 2.2 MW

Apr 26 1995 11:45:59:160AM 950426011 Bruce Lipschultz shot 11: Turned off the gas early to try and compensate for the density
rise during RF. RF had difficulty with tuning.

Apr 26 1995 11:57:16:000AM 950426012 Bruce Lipschultz shot 12: 1.1 MW of RF. No H-mode. density lower as well. We will try to
bring the density back

Apr 26 1995 12:08:44:080PM 950426013 Bruce Lipschultz shot 13: Back to H-mode with RF power slightly over 2MW.

Apr 26 1995 12:09:39:460PM 950426014 Bruce Lipschultz shot 14: RF faulted on this shot. Divertor quite detached without RF.

Apr 26 1995 12:10:35:010PM 950426015 Bruce Lipschultz shot 15: disruptive mess

Apr 26 1995 12:25:54:360PM 950426016 Bruce Lipschultz shot 16: 2 MW RF, H-mode at .92 seconds. Lots of radiated power during
H-mode.

Apr 26 1995 12:41:02:190PM 950426017 Bruce Lipschultz shot 17: 1 MW of RF, no H-mode.

Apr 26 1995 12:58:59:680PM 950426018 Bruce Lipschultz shot 18: 2.2 MW RF w/H-mode.

Apr 26 1995 01:11:40:690PM 950426019 Bruce Lipschultz shot 19: probe scan on this shot. 2 MW of RF, H-mode.

Apr 26 1995 01:38:49:110PM 950426020 Bruce Lipschultz shot 20: Rf tripped, density stayed constant at nl04=1.35e20.

Apr 26 1995 01:43:58:190PM 950426021 Bruce Lipschultz shot 21: 2 MW RF power, H-mode. Probe scan.

Apr 26 1995 02:15:03:220PM 950426022 Bruce Lipschultz shot 22: x-point moved 1-2 mm. RF fired and usual H-mode. No probe scan.

Apr 26 1995 02:16:21:130PM 950426023 Bruce Lipschultz shot 23: Shifted x-point out another 3 mm to R=56.3. No probe scan.
RF power of 2 MW with H-mode.

Apr 26 1995 02:27:53:450PM 950426024 Bruce Lipschultz shot 24: Same as 23 but with probe scan. RF power of 2 MW.

Apr 26 1995 02:51:08:690PM 950426025 Bruce Lipschultz shot 25: RF faulted. no probe scan.

Apr 26 1995 03:03:05:490PM 950426026 Bruce Lipschultz shot 26: 1 MW RF with H-mode occuring only when RF turned off. No probe
scan.

Apr 26 1995 03:40:50:260PM 950426027 Bruce Lipschultz shot 27: 1 MW RF again with H-mode as RF turns off. No probe scan.

Apr 26 1995 03:42:24:510PM 950426028 Bruce Lipschultz shot 28: 1 MW RF, same as previous shots. x-point at R=54.7.

Apr 26 1995 03:45:05:230PM 950426029 Bruce Lipschultz shot 29: x-point at R=54.0. 1 MW RF. End of x-point run.

Apr 26 1995 03:51:24:330PM 950426029 Bruce Lipschultz shot 29: x-point at R=54.0. 1 MW RF. End of x-point run.

Apr 26 1995 03:59:39:140PM 950426029 Darren Garnier PEP Mode run begins. Try full RF power, two pulses with med
and large pellet before pulses by 50 msec.
Pellet times are .49 and .79
RF at .54 and .84
Got approx 1 MW RF power

Apr 26 1995 04:06:09:240PM 950426031 Darren Garnier Repeat.
Second pellet did in plasma. Good PEP on first pellet, and
H-Mode. Very similar to the famous shot 950120016.

Apr 26 1995 04:12:54:870PM 950426031 Darren Garnier Repeat.
Second pellet did in the plasma. Good PEP on first pellet, and
H-Mode. Very similar to the famous shot 950120016. 2MW RF.

Apr 26 1995 04:21:05:000PM 950426032 Darren Garnier Move pellets 5msec closer. Only got 1st pellet.
More H-Mode. Slightly better RF power and better neutron
rate.

Apr 26 1995 04:29:39:620PM 950426033 Darren Garnier Move pellets forward again by 10msec (.505 , .805)
Fizzle

Apr 26 1995 04:52:36:290PM 950426034 Darren Garnier Repeat. A little less pep. Also less RF. Next shot back to
previous gap because peaking hadn't maxed when RF turns on.

Apr 26 1995 04:55:01:840PM 950426035 Darren Garnier This time we will try current ramp during PEP to try to
continue any reverse shear.

Apr 27 1995 07:08:35:600AM 950426035 Darren Garnier This time we will try current ramp during PEP to try to
continue any reverse shear.
Ramp went as planned, didn't see much of an improvement in the
PEP. No second pellet.

Physics Operator Comments

Apr 26 1995 08:04:39:290AM John Goetz Run 950426 is in support of MP#109 - Further Investigation of the
X-point Region

This will be a continuation of run 950425. The run plan as outlined
in the log under 950425 is:
1 - Get a discharge with the right characteristics.
Check outer strike and adjust ZXL to get it
on or below probe 7.
2 - Run 4 shots for spectroscopic scan of H_2 lines
3 - Switch to D_2 and turn on RF at 0.9sec. Spectroscopy
scan for 14 shots.
4 - Scan McPherson across x-point.
5 - Scan x-point in major radius.

Run 950426 will begin at step 4.

Apr 26 1995 08:44:19:210AM 950426001 John Goetz Shot 950426001:
load shot 950425034

Results:
fizzle - null is said to be similar to yesterday's
CII light is > 0.01 - breakdown occurs at 6.5msec

Apr 26 1995 08:56:44:800AM 950426002 John Goetz Shot 950426002:
drop fill pressure to 2.1e-5

Results:
plasma - disrupts @ 1.27 (shark fin)
CII light still high ( = .01) - just barely made it

Apr 26 1995 09:10:33:260AM 950426003 John Goetz Shot 950426003:
slow down CLEARIN ramp
ZXU = + .04 @ 1.0sec

Results:
fizzle - breakdown @ .006
CII light = .007
bounces @ .019

Apr 26 1995 09:21:03:290AM 950426004 John Goetz Shot 950426004:
BR_0 offset = 6.0e-3

Results:
fizzle - bounces multiple times
definite radial field problem - went the wrong way

Apr 26 1995 09:37:05:880AM 950426005 John Goetz Shot 950426005:
BR_0 offset = 7.0e-3

Results:
plasma - disrupts @ 1.27
CII light = .008 - shouldn't have made it

Apr 26 1995 09:50:11:810AM 950426006 John Goetz Shot 950426006:
ramp RCUR in faster
ZXU = +.0425

Results:
fizzle - CII light = .008
b.d. @ .006; bounces @ .015

Apr 26 1995 10:05:40:490AM 950426007 John Goetz Shot 950426007:
IC_EF4 = -1080
P_0 = 1.9e-5

Results:
plasma - disrupts @ 1.28
CII light = .004
no change in SSEP distance (from 005)

Apr 26 1995 10:24:43:440AM 950426008 John Goetz Shot 950426008:
ZXU = + .0475

Results:
plasma - disr. @ 1.28
Mo inj. @ 0.8
SSEP slightly larger

Apr 26 1995 10:45:15:620AM 950426009 John Goetz Shot 950426009:
RXU = -.03

Results:
plasma - disr. @ 1.3
SSEP better ( = 1.35)

Apr 26 1995 10:58:06:950AM 950426010 John Goetz Shot 950426010:
RXU = -.02

Results:
plasma - disrupts @ 1.30
SSEP increases to 1.4

Apr 26 1995 11:17:29:140AM 950426011 John Goetz Shot 950426011:
RXU = -.01
NL04 = 0 @ 0.8sec

Results:
plasma - disr. @ 1.35
SSEP = 1.5 and flat

Apr 26 1995 11:28:15:890AM 950426012 John Goetz Shot 950426012:
no changes

Results:
plasma - disrupts @ 1.35

Apr 26 1995 11:44:22:160AM 950426013 John Goetz Shot 950426013:
NL04 = 0 @ 1.0sec

Results:
plasma - disrupts @ 1.30

Apr 26 1995 11:54:52:700AM 950426014 John Goetz Shot 950426014:
no changes

Results:
plasma - disrupts @ 1.22
no RF - outer gap -> 2.3cm @ 0.55sec

Apr 26 1995 12:12:06:780PM 950426015 John Goetz Shot 950426015:
no changes

Results:
plasma - disr. @ 0.45
multiple Mo injections beginning @ 0.4sec

Apr 26 1995 12:25:36:680PM 950426016 John Goetz Shot 950426016:
refill A_SIDE plenum to 19PSIA

Results:
plasma - disrupts @ 1.29

Apr 26 1995 12:36:30:980PM 950426017 John Goetz Shot 950426017:
no changes

Results:
plasma - disrupts @ 1.21 (only one antenna)

Apr 26 1995 12:54:17:950PM 950426018 John Goetz Shot 950426018:
no changes

Results:
plasma - disrupts @ 1.29
good target for FSP

Apr 26 1995 01:08:14:540PM 950426019 John Goetz Shot 950426019:
no changes

Results:
plasma - disrupts @ 1.30

Apr 26 1995 01:19:03:200PM 950426020 John Goetz Shot 950426020:
no changes

Results:
plasma - disrupts @ 1.21
one antenna for a short time

Apr 26 1995 01:39:51:080PM 950426021 John Goetz Shot 950426021:
no changes

Results:
plasma - disrupts @ 1.31
RXL = 56.0cm; ZXL = -37.6cm

Apr 26 1995 01:57:40:420PM 950426022 John Goetz Shot 950426022:
RXL = +2e-3 from 0.7 to 1.0sec

Results:
plasma - disrupts @ 1.31
RXL = 56.1; ZXL = -37.6 ( only got about 1 or 2 mm in RXL)

Apr 26 1995 02:19:26:280PM 950426023 John Goetz Shot 950426023:
RXL = +4e-3 from 0.7 to 1.0sec and P gain = 4 after 0.55 sec

Results:
plasma - disr. @ 1.31
RXL = 56.4; ZXL = -37.6; power supplies are not near the rail
o.k. target for FSP

Apr 26 1995 02:28:43:830PM 950426024 John Goetz Shot 950426024:
faster CLEARIN ramp

Results:
plasma - disr. @ 1.28
RXL = 56.3

Apr 26 1995 02:44:41:400PM 950426025 John Goetz Shot 950426025:
RXL = 1e-2

Results:
plasma - disr. @ 1.26
RXL = 56.8

Apr 26 1995 02:59:39:930PM 950426026 John Goetz Shot 950426026:
RXL = 1.8e-2

Results:
plasma - disrupts @ 1.28
RXL = 57.5

Apr 26 1995 03:15:17:580PM 950426027 John Goetz Shot 950426027:
RXL = -5e-3

Results:
plasma - disrupts @ 1.30
RXL = 55.5 -> 55.4

Apr 26 1995 03:28:46:350PM 950426028 John Goetz Shot 950426028:
RXL = -13e-3

Results:
plasma - disrupts @ 1.30
RXL = 54.7

Apr 26 1995 03:45:58:930PM 950426029 John Goetz Shot 950426029:
RXL = -20e-3

Results:
plasma - disr. @ 1.30
RXL ~ 54.0

Apr 26 1995 03:56:27:340PM 950426030 John Goetz Shot 950426030:
end of MP#109
start MP#081 - PEP mode
RXL=0; NL04=1e20; RCUR=0.669

Results:
plasma - disrupts @ 1.43
two Li pellets; two RF pulses; no EF2 problems
outer gap = 1.6cm

Apr 26 1995 04:08:33:340PM 950426031 John Goetz Shot 950426031:
no changes

Results:
plasma - disrupts @ 0.81
halo warning
dies promptly after the second pellet

Apr 26 1995 04:22:50:340PM 950426032 John Goetz Shot 950426032:
RCUR = 0.671

Results:
plasma - disrupts @ 1.28
outer gap = 1.0 -> 1.5cm

Apr 26 1995 04:50:30:190PM 950426033 John Goetz Shot 950426033:
RCUR = 0.673 -> 0.675

Results:
DUD
EF2 power supply problem

Apr 26 1995 04:51:57:110PM 950426034 John Goetz Shot 950426034:
no changes

Results:
plasma - disrupts @ 1.34
2 Li pellets; 2 x > 2.5MW RF

Apr 26 1995 05:00:03:160PM 950426035 John Goetz Shot 950426035:
ramp Ip from 0.8 to 1.0MA starting at 0.54sec

Results:
plasma - disrupts @ 1.37
it takes ~ 0.1sec to ramp from 0.8 to 1.0MA
only one pellet and one antenna

Engineering Operator Comments

Shot Time Type Status Comment

1 08:32:46:720AM Plasma Ok

2 08:45:09:690AM Plasma Ok

3 09:01:35:970AM Plasma Ok

4 09:14:04:860AM Plasma Ok

5 09:24:30:810AM Plasma Ok

6 09:41:55:130AM Plasma Ok

7 09:53:03:480AM Plasma Ok

8 10:11:04:520AM Plasma Ok

9 10:24:19:300AM Plasma Ok

10 10:43:29:150AM Plasma Ok

11 11:02:07:360AM Plasma Ok

12 11:18:24:530AM Plasma Ok

13 11:34:05:040AM Plasma Ok

14 11:45:18:450AM Plasma Ok

15 11:59:01:230AM Plasma Ok

16 12:12:37:660PM Plasma Ok

17 12:28:42:670PM Plasma Ok

18 12:44:14:910PM Plasma Ok

19 12:57:03:280PM Plasma Ok No faults.

20 01:09:37:390PM Plasma Ok No faults.

21 01:29:28:370PM Plasma Ok No Faults.

22 01:43:48:030PM Plasma Ok No Faults.

23 02:00:22:620PM Plasma Ok no faults

24 02:16:19:750PM Plasma Ok no faults

25 02:30:16:510PM Plasma Ok no faults

26 02:47:03:910PM Plasma Ok no faults

27 03:01:34:600PM Plasma Ok No Faults.

28 03:18:00:050PM Plasma Ok No Faults.

29 03:29:04:200PM Plasma Ok No Faults.

30 03:46:53:840PM Plasma Ok No Faults.

31 03:59:39:800PM Plasma Ok No Faults.

32 04:11:52:190PM Plasma Ok No Faults.

33 04:27:27:460PM Plasma Ok No Faults.

34 04:41:30:990PM Plasma Ok No Faults.

35 04:54:47:900PM Plasma Ok No Faults.

Session Leader Comments
Apr 26 1995 08:33:31:540AM		Bruce Lipschultz	Run 950426 Engineering operator: V. Bertolino/J. Daigle Phyics operator: J. Goetz Session leader: BLip Mini-proposal #109: "Further investigation of the x-point". We plan to complete the program started yesterday. This involves several more points in a spectral scan and then a scan of the x-point to determine the effect on x-point emission, inner divertor and detachment characteristics.
Apr 26 1995 09:00:07:740AM	950426002	Bruce Lipschultz	Run 950426 shot 1: fizzle shot 2: repeat of shot 34 from yesterday. All seemed to be fine. Strike point position just below probe 7. nl04 peaking at ~ 1.5 e20.
Apr 26 1995 09:37:28:120AM	950426005	Bruce Lipschultz	shot 3&4: fizzle shot 5: shot went ok. H-mode during RF (.9 - 1.05 seconds) wtih ~ 2.5 MW. nl04 jumps up to about 2e20 during H-mode, 1.5e20 before.
Apr 26 1995 10:10:08:580AM	950426005	Bruce Lipschultz	shot 6: fizzle shot 7: H-mode again w/ 2.5 MW.
Apr 26 1995 10:32:59:110AM	950426008	Bruce Lipschultz	shot 8: H-mode starting at 1.0 sec. Slightly more than 2 MW. Measurements with the MacPherson indicate that CVI emission at the x-point increases by a factor of 15 during the RF pulse.
Apr 26 1995 10:52:28:280AM	950426009	Bruce Lipschultz	shot 9: H-mode around .95 seconds.
Apr 26 1995 10:56:30:580AM	950426010	Bruce Lipschultz	shot 10: H-mode at .95 seconds. 2.2 MW
Apr 26 1995 10:56:51:980AM	950426010	Bruce Lipschultz	shot 10: H-mode at .95 seconds. 2.2 MW
Apr 26 1995 11:45:59:160AM	950426011	Bruce Lipschultz	shot 11: Turned off the gas early to try and compensate for the density rise during RF. RF had difficulty with tuning.
Apr 26 1995 11:57:16:000AM	950426012	Bruce Lipschultz	shot 12: 1.1 MW of RF. No H-mode. density lower as well. We will try to bring the density back
Apr 26 1995 12:08:44:080PM	950426013	Bruce Lipschultz	shot 13: Back to H-mode with RF power slightly over 2MW.
Apr 26 1995 12:09:39:460PM	950426014	Bruce Lipschultz	shot 14: RF faulted on this shot. Divertor quite detached without RF.
Apr 26 1995 12:10:35:010PM	950426015	Bruce Lipschultz	shot 15: disruptive mess
Apr 26 1995 12:25:54:360PM	950426016	Bruce Lipschultz	shot 16: 2 MW RF, H-mode at .92 seconds. Lots of radiated power during H-mode.
Apr 26 1995 12:41:02:190PM	950426017	Bruce Lipschultz	shot 17: 1 MW of RF, no H-mode.
Apr 26 1995 12:58:59:680PM	950426018	Bruce Lipschultz	shot 18: 2.2 MW RF w/H-mode.
Apr 26 1995 01:11:40:690PM	950426019	Bruce Lipschultz	shot 19: probe scan on this shot. 2 MW of RF, H-mode.
Apr 26 1995 01:38:49:110PM	950426020	Bruce Lipschultz	shot 20: Rf tripped, density stayed constant at nl04=1.35e20.
Apr 26 1995 01:43:58:190PM	950426021	Bruce Lipschultz	shot 21: 2 MW RF power, H-mode. Probe scan.
Apr 26 1995 02:15:03:220PM	950426022	Bruce Lipschultz	shot 22: x-point moved 1-2 mm. RF fired and usual H-mode. No probe scan.
Apr 26 1995 02:16:21:130PM	950426023	Bruce Lipschultz	shot 23: Shifted x-point out another 3 mm to R=56.3. No probe scan. RF power of 2 MW with H-mode.
Apr 26 1995 02:27:53:450PM	950426024	Bruce Lipschultz	shot 24: Same as 23 but with probe scan. RF power of 2 MW.
Apr 26 1995 02:51:08:690PM	950426025	Bruce Lipschultz	shot 25: RF faulted. no probe scan.
Apr 26 1995 03:03:05:490PM	950426026	Bruce Lipschultz	shot 26: 1 MW RF with H-mode occuring only when RF turned off. No probe scan.
Apr 26 1995 03:40:50:260PM	950426027	Bruce Lipschultz	shot 27: 1 MW RF again with H-mode as RF turns off. No probe scan.
Apr 26 1995 03:42:24:510PM	950426028	Bruce Lipschultz	shot 28: 1 MW RF, same as previous shots. x-point at R=54.7.
Apr 26 1995 03:45:05:230PM	950426029	Bruce Lipschultz	shot 29: x-point at R=54.0. 1 MW RF. End of x-point run.
Apr 26 1995 03:51:24:330PM	950426029	Bruce Lipschultz	shot 29: x-point at R=54.0. 1 MW RF. End of x-point run.
Apr 26 1995 03:59:39:140PM	950426029	Darren Garnier	PEP Mode run begins. Try full RF power, two pulses with med and large pellet before pulses by 50 msec. Pellet times are .49 and .79 RF at .54 and .84 Got approx 1 MW RF power
Apr 26 1995 04:06:09:240PM	950426031	Darren Garnier	Repeat. Second pellet did in plasma. Good PEP on first pellet, and H-Mode. Very similar to the famous shot 950120016.
Apr 26 1995 04:12:54:870PM	950426031	Darren Garnier	Repeat. Second pellet did in the plasma. Good PEP on first pellet, and H-Mode. Very similar to the famous shot 950120016. 2MW RF.
Apr 26 1995 04:21:05:000PM	950426032	Darren Garnier	Move pellets 5msec closer. Only got 1st pellet. More H-Mode. Slightly better RF power and better neutron rate.
Apr 26 1995 04:29:39:620PM	950426033	Darren Garnier	Move pellets forward again by 10msec (.505 , .805) Fizzle
Apr 26 1995 04:52:36:290PM	950426034	Darren Garnier	Repeat. A little less pep. Also less RF. Next shot back to previous gap because peaking hadn't maxed when RF turns on.
Apr 26 1995 04:55:01:840PM	950426035	Darren Garnier	This time we will try current ramp during PEP to try to continue any reverse shear.
Apr 27 1995 07:08:35:600AM	950426035	Darren Garnier	This time we will try current ramp during PEP to try to continue any reverse shear. Ramp went as planned, didn't see much of an improvement in the PEP. No second pellet.

Physics Operator Comments
Apr 26 1995 08:04:39:290AM		John Goetz	Run 950426 is in support of MP#109 - Further Investigation of the X-point Region This will be a continuation of run 950425. The run plan as outlined in the log under 950425 is: 1 - Get a discharge with the right characteristics. Check outer strike and adjust ZXL to get it on or below probe 7. 2 - Run 4 shots for spectroscopic scan of H_2 lines 3 - Switch to D_2 and turn on RF at 0.9sec. Spectroscopy scan for 14 shots. 4 - Scan McPherson across x-point. 5 - Scan x-point in major radius. Run 950426 will begin at step 4.
Apr 26 1995 08:44:19:210AM	950426001	John Goetz	Shot 950426001: load shot 950425034 Results: fizzle - null is said to be similar to yesterday's CII light is > 0.01 - breakdown occurs at 6.5msec
Apr 26 1995 08:56:44:800AM	950426002	John Goetz	Shot 950426002: drop fill pressure to 2.1e-5 Results: plasma - disrupts @ 1.27 (shark fin) CII light still high ( = .01) - just barely made it
Apr 26 1995 09:10:33:260AM	950426003	John Goetz	Shot 950426003: slow down CLEARIN ramp ZXU = + .04 @ 1.0sec Results: fizzle - breakdown @ .006 CII light = .007 bounces @ .019
Apr 26 1995 09:21:03:290AM	950426004	John Goetz	Shot 950426004: BR_0 offset = 6.0e-3 Results: fizzle - bounces multiple times definite radial field problem - went the wrong way
Apr 26 1995 09:37:05:880AM	950426005	John Goetz	Shot 950426005: BR_0 offset = 7.0e-3 Results: plasma - disrupts @ 1.27 CII light = .008 - shouldn't have made it
Apr 26 1995 09:50:11:810AM	950426006	John Goetz	Shot 950426006: ramp RCUR in faster ZXU = +.0425 Results: fizzle - CII light = .008 b.d. @ .006; bounces @ .015
Apr 26 1995 10:05:40:490AM	950426007	John Goetz	Shot 950426007: IC_EF4 = -1080 P_0 = 1.9e-5 Results: plasma - disrupts @ 1.28 CII light = .004 no change in SSEP distance (from 005)
Apr 26 1995 10:24:43:440AM	950426008	John Goetz	Shot 950426008: ZXU = + .0475 Results: plasma - disr. @ 1.28 Mo inj. @ 0.8 SSEP slightly larger
Apr 26 1995 10:45:15:620AM	950426009	John Goetz	Shot 950426009: RXU = -.03 Results: plasma - disr. @ 1.3 SSEP better ( = 1.35)
Apr 26 1995 10:58:06:950AM	950426010	John Goetz	Shot 950426010: RXU = -.02 Results: plasma - disrupts @ 1.30 SSEP increases to 1.4
Apr 26 1995 11:17:29:140AM	950426011	John Goetz	Shot 950426011: RXU = -.01 NL04 = 0 @ 0.8sec Results: plasma - disr. @ 1.35 SSEP = 1.5 and flat
Apr 26 1995 11:28:15:890AM	950426012	John Goetz	Shot 950426012: no changes Results: plasma - disrupts @ 1.35
Apr 26 1995 11:44:22:160AM	950426013	John Goetz	Shot 950426013: NL04 = 0 @ 1.0sec Results: plasma - disrupts @ 1.30
Apr 26 1995 11:54:52:700AM	950426014	John Goetz	Shot 950426014: no changes Results: plasma - disrupts @ 1.22 no RF - outer gap -> 2.3cm @ 0.55sec
Apr 26 1995 12:12:06:780PM	950426015	John Goetz	Shot 950426015: no changes Results: plasma - disr. @ 0.45 multiple Mo injections beginning @ 0.4sec
Apr 26 1995 12:25:36:680PM	950426016	John Goetz	Shot 950426016: refill A_SIDE plenum to 19PSIA Results: plasma - disrupts @ 1.29
Apr 26 1995 12:36:30:980PM	950426017	John Goetz	Shot 950426017: no changes Results: plasma - disrupts @ 1.21 (only one antenna)
Apr 26 1995 12:54:17:950PM	950426018	John Goetz	Shot 950426018: no changes Results: plasma - disrupts @ 1.29 good target for FSP
Apr 26 1995 01:08:14:540PM	950426019	John Goetz	Shot 950426019: no changes Results: plasma - disrupts @ 1.30
Apr 26 1995 01:19:03:200PM	950426020	John Goetz	Shot 950426020: no changes Results: plasma - disrupts @ 1.21 one antenna for a short time
Apr 26 1995 01:39:51:080PM	950426021	John Goetz	Shot 950426021: no changes Results: plasma - disrupts @ 1.31 RXL = 56.0cm; ZXL = -37.6cm
Apr 26 1995 01:57:40:420PM	950426022	John Goetz	Shot 950426022: RXL = +2e-3 from 0.7 to 1.0sec Results: plasma - disrupts @ 1.31 RXL = 56.1; ZXL = -37.6 ( only got about 1 or 2 mm in RXL)
Apr 26 1995 02:19:26:280PM	950426023	John Goetz	Shot 950426023: RXL = +4e-3 from 0.7 to 1.0sec and P gain = 4 after 0.55 sec Results: plasma - disr. @ 1.31 RXL = 56.4; ZXL = -37.6; power supplies are not near the rail o.k. target for FSP
Apr 26 1995 02:28:43:830PM	950426024	John Goetz	Shot 950426024: faster CLEARIN ramp Results: plasma - disr. @ 1.28 RXL = 56.3
Apr 26 1995 02:44:41:400PM	950426025	John Goetz	Shot 950426025: RXL = 1e-2 Results: plasma - disr. @ 1.26 RXL = 56.8
Apr 26 1995 02:59:39:930PM	950426026	John Goetz	Shot 950426026: RXL = 1.8e-2 Results: plasma - disrupts @ 1.28 RXL = 57.5
Apr 26 1995 03:15:17:580PM	950426027	John Goetz	Shot 950426027: RXL = -5e-3 Results: plasma - disrupts @ 1.30 RXL = 55.5 -> 55.4
Apr 26 1995 03:28:46:350PM	950426028	John Goetz	Shot 950426028: RXL = -13e-3 Results: plasma - disrupts @ 1.30 RXL = 54.7
Apr 26 1995 03:45:58:930PM	950426029	John Goetz	Shot 950426029: RXL = -20e-3 Results: plasma - disr. @ 1.30 RXL ~ 54.0
Apr 26 1995 03:56:27:340PM	950426030	John Goetz	Shot 950426030: end of MP#109 start MP#081 - PEP mode RXL=0; NL04=1e20; RCUR=0.669 Results: plasma - disrupts @ 1.43 two Li pellets; two RF pulses; no EF2 problems outer gap = 1.6cm
Apr 26 1995 04:08:33:340PM	950426031	John Goetz	Shot 950426031: no changes Results: plasma - disrupts @ 0.81 halo warning dies promptly after the second pellet
Apr 26 1995 04:22:50:340PM	950426032	John Goetz	Shot 950426032: RCUR = 0.671 Results: plasma - disrupts @ 1.28 outer gap = 1.0 -> 1.5cm
Apr 26 1995 04:50:30:190PM	950426033	John Goetz	Shot 950426033: RCUR = 0.673 -> 0.675 Results: DUD EF2 power supply problem
Apr 26 1995 04:51:57:110PM	950426034	John Goetz	Shot 950426034: no changes Results: plasma - disrupts @ 1.34 2 Li pellets; 2 x > 2.5MW RF
Apr 26 1995 05:00:03:160PM	950426035	John Goetz	Shot 950426035: ramp Ip from 0.8 to 1.0MA starting at 0.54sec Results: plasma - disrupts @ 1.37 it takes ~ 0.1sec to ramp from 0.8 to 1.0MA only one pellet and one antenna

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:32:46:720AM	Plasma	Ok
2	08:45:09:690AM	Plasma	Ok
3	09:01:35:970AM	Plasma	Ok
4	09:14:04:860AM	Plasma	Ok
5	09:24:30:810AM	Plasma	Ok
6	09:41:55:130AM	Plasma	Ok
7	09:53:03:480AM	Plasma	Ok
8	10:11:04:520AM	Plasma	Ok
9	10:24:19:300AM	Plasma	Ok
10	10:43:29:150AM	Plasma	Ok
11	11:02:07:360AM	Plasma	Ok
12	11:18:24:530AM	Plasma	Ok
13	11:34:05:040AM	Plasma	Ok
14	11:45:18:450AM	Plasma	Ok
15	11:59:01:230AM	Plasma	Ok
16	12:12:37:660PM	Plasma	Ok
17	12:28:42:670PM	Plasma	Ok
18	12:44:14:910PM	Plasma	Ok
19	12:57:03:280PM	Plasma	Ok	No faults.
20	01:09:37:390PM	Plasma	Ok	No faults.
21	01:29:28:370PM	Plasma	Ok	No Faults.
22	01:43:48:030PM	Plasma	Ok	No Faults.
23	02:00:22:620PM	Plasma	Ok	no faults
24	02:16:19:750PM	Plasma	Ok	no faults
25	02:30:16:510PM	Plasma	Ok	no faults
26	02:47:03:910PM	Plasma	Ok	no faults
27	03:01:34:600PM	Plasma	Ok	No Faults.
28	03:18:00:050PM	Plasma	Ok	No Faults.
29	03:29:04:200PM	Plasma	Ok	No Faults.
30	03:46:53:840PM	Plasma	Ok	No Faults.
31	03:59:39:800PM	Plasma	Ok	No Faults.
32	04:11:52:190PM	Plasma	Ok	No Faults.
33	04:27:27:460PM	Plasma	Ok	No Faults.
34	04:41:30:990PM	Plasma	Ok	No Faults.
35	04:54:47:900PM	Plasma	Ok	No Faults.