Alcator C-Mod Run 940622 Information

Miniproposals

Miniproposal:

Date Filed:

Title:

First Author:

Session Leader: Steve Golovato (shots 1-28)

Miniproposal: 059

Date Filed: 6/6/1994

Title: ICRF Heating (PRF>1 MW)

First Author: Yuichi Takase

Session Leader: Steve Golovato (shots 1-28)

Operators
Session leader(s):	Steve Golovato,Steve Golovato
Physics operator(s):	Yuichi Takase
Engineering operator(s):	Frank Silva,David Gwinn

Engineering Operator Run Comment
GOLAVATO/TAKASE:SILVA/GWINN

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:11:243PM

Author: To Be Determined

Session Leader Summary - Run 940622

SL - Golovato
PO - Takase
EO - ?????? (i don't remember)

Goals - ICRF heating run

1) couple high power to diverted plasmas.
2) get fast scanning probe data w/ and w/o rf.
3) get first CX data (diagnostic checkout). Not accomplished.

The run was very successful. We started with diverted shot 940617018. Good diverted
plasmas were achieved at high elongation (kappa=1.7) with good inner (1.5-2cm) and
outer (~2cm) gaps. These shots were almost double null and the x-point was high.
Density feedback was tried for the first time and basically worked. It was on from
shot 9 on and was adjusted after shots 13-14, which disrupted around OH crossover.
Bringing the density up more slowly through this period cured the problem. Shots
15, 18, 23 and 25 had no rf and disrupted early, during the time the rf would have
been on. Shot 15 disrupted after the rf shut off early. Shot 25 disrupted just
before the rf came on. For shots 26-28, the rf was moved 50 ms earlier and did not
disrupt. The rf seemed to be having a stabilizing effect on the VDEs.

Hydrogen puffing was done on shots 8-20 with larger puffs on shots 13-20. There was
a visible density rise at about 600 ms which was attributed to the H2 puff. We were
probably puffing too hard. Loading was good, about 6-8 ohms. The poster shot for
icrf heating of a diverted plasma was shot 6. Ti went from 1.5 to 2.5 kev (hirex
and neutrons), Te went from 2 to 2.7 kev (peak of ece polychrometer channel 5
calibrated from michelson central Te before rf), and stored energy went from 35
to 65 kj from efit (diamagnetic signal shows delta_Wp of 35 kj). The rf power was
1.5 mw and ne_bar was 1.2e20 m-3.

Good shots were: 1-12, 16-17, 19-22, 24, 26-28

Good rf-heated shots were: 2-7, 8?, 16-17, 19-22, 24, 26-28

Early disruption (around OH crossover): 13-14 (related to density feedback)

Mid-shot disruption: 15, 18, 23, 25 (note that these shots had no rf)

Shot accounting: 28 plasmas

Physics Operator Summaries

Entered: Jul 7 2004 04:36:51:973PM

Author: To Be Determined

940622 RF heating of diverted plasmas (piggyback: density feedback)

Before the run, it was noted that there was an "air puff" into
the vessel after ECDC was turned off.

We started out with 940617018 with minor modifications.
These diverted plasmas were stable, reasonably looking divertor
plasmas with approximately correct strike points and matched
the ICRF antenna reasonable well. We had two shots (002 and 006)
that ramped all the way down, but we could use some improvements
on controlled rampdown. Shot 028 had some improvements (suggested
by Ian) programmed in, but disrupted before rampdown. There is
evidence that in addition to startup assist, RF helps stabilize
the plasma (see Session Leader's summary).

Density feedback now works successfully.

Pl/Fz/D Shot Comments
P 001 Fiducial
P 002 Loaded 940617018, Ip flat top shortened to 1.0sec, Ar on
Nice plasma, ramped all the way down
P 003 Add density feedback in wire 9
P 004 pasted density trace from 003, no gain.
P 005 no change
P 006 add a little gas puff at the end
P 007 zeroed density reference
P 008 H puff 100V X 10msec @ .31sec, add two more Ar puffs
P 009 +500A on EF1's at rampdown, +.005 on RCUR at 1.0sec
density feedback on with gain=1
P 010 ne gain=2, H puff 100V X 20msec
P 011 ne gain=4, raised ne waveform to 5,
added small density pulse at rampdown, +500A on EF1's
P 012 ne waveform raised to 6.6, gain=3(<0.4s), 6(>0.4s)
(forgot to load?, looks similar to 011)
P 013 H puff 100V X 40msec, died early
P 014 Repeat, died early again (too much gas)
P 015 density waveform to ramp from 4@0.3s to 6.6@.5s, better
P 016 density waveform to ramp from 4@0.3s to 6.5@.6s
lasted till Ip rampdown
P 017 got rid of structures in gas programming
P 018 density feedback derivative gain=2 after 0.45s, no RF
P 019 changed gain, 0@0.3s, ramping up to 6@0.4s
P 020 same
P 021 no H puff, the density rise @ 0.3sec was from H puff
P 022 density feedback gain up to 8, faster density ramp, no H puff
CLEARIN 0.000 (was -0.005)
P 023 CLEARIN +0.005, large clearance on both sides, disrupted
P 024 tweaks on gas programming and feedback
Nice shot with 2cm inner and outer gaps, kapp=1.7
P 025 Repeat, scanning probe in, disrupted around 0.7sec
P 026 Lots of tweaks during Ip rampdown
changes in RXL, ZXL, KAPPA, CLEARIN, RCUR, ZCUR
disrupted during rampdown
P 027 repeat, disrupted during rampdown
P 028 changes in RCUR, CLEARIN, EF1 during rampdown
disrupted at 0.9sec

28 Plasmas
0 Fizzles
0 Duds

Session Leader Comments

Jun 22 1994 09:19:37:270AM Steve Golovato Run - 940622 - rf run

Goals -

1) couple high power to diverted plasmas.
2) get fast scanning probe edge profiles with and without rf,
limited and diverted.
3) get first chaarge exchange data (diagnostic checkout)

Jun 22 1994 09:20:16:780AM 940622001 Steve Golovato fiducial shot ran well but rf interrupted, tuning wasn't chosen for
this shot.

Jun 22 1994 09:38:45:950AM 940622002 Steve Golovato Shot 940622002 - good diverted shot, inner gap a little small, 1.5cm.
loading about 6 Ohms, 1 MW rf power, 28 kV.

Jun 22 1994 09:49:36:040AM 940622003 Steve Golovato Shot 940622003 - tweeked up rf power, tuning was very good last shot,
rho_V =.07-.14 last shot.

another good shot, 1.1MW, 31kV.

Jun 22 1994 10:07:03:620AM 940622004 Steve Golovato Shot 940622004 - tweeked up power, added ramp to try to keep power
constant during pulse. between 600-800ms equilibrium goes from
upper null to double null to lower null divertor, get bursts on h_alpha
during this time.

Jun 22 1994 10:24:09:070AM 940622005 Steve Golovato Shot 940622005 - more power. another good shot, 1.4MW,35kV
desnity about half of last shot for some reason, loading
a little lower, 5.7Ohms.

Jun 22 1994 10:53:27:980AM 940622006 Steve Golovato Shot 940622006 - 1.4MW, 36kV. fast scanning probe scanning at
750ms (with rf) and 900ms (after rf).

Jun 22 1994 11:06:45:730AM 940622007 Steve Golovato Shot 940622007 - low density shot again. 1.5MW, 36kV.
delta(Ti)=1000eV from hirex and neutrons.
delta(Te)=500eV.

Jun 22 1994 11:31:24:110AM 940622008 Steve Golovato Shot 940622008 - loading only 5 Ohms, rf interrupting., 38kV.

Jun 22 1994 11:45:55:540AM 940622009 Steve Golovato Shot 940622009 - trying density feedback this shot.
also moved plasma out a little. lots of rf interrupts, 38.5kV
try tuning a little.

puffig H2 for the last few shots, increase for next shot.

Jun 22 1994 12:29:58:410PM 940622010 Steve Golovato Shot 940622010 - rf interrupting, lower power, but still 39kV.
tune a little more.

Jun 22 1994 12:48:03:980PM 940622011 Steve Golovato Shot 940622011 - rf still interrupts. density feedback appears to be
working. rasie density to get loading up, lower rf voltage.

Jun 22 1994 12:48:31:780PM 940622012 Steve Golovato Shot 940622012 - repeat of 11,

Jun 22 1994 12:59:04:680PM 940622013 Steve Golovato Shot 940622013 - disrupted starting at 400ms.

Jun 22 1994 01:11:40:580PM 940622014 Steve Golovato Shot 940622014 - same as previous shot, having problem at oh crossover,
current never come out of hesitation. seems related to density feedback
which comes on too hard at 300ms. we both icreased gain and increased
density level, need to bring up density more slowly.

Jun 22 1994 01:28:36:820PM 940622015 Steve Golovato Shot 940622015 - worked. but short rf pulse 40ms, 1.7MW. had
fpa screen current overload. density higher as programmed.

Jun 22 1994 01:46:14:130PM 940622016 Steve Golovato Shot 940622016 - loading higher, 8 ohms. 1.8MW, 33kV at higher
loading.

Jun 22 1994 01:48:47:730PM 940622016 Steve Golovato Shot 940622016 - loading higher, 8 ohms. 1.8MW, 33kV at higher
loading.

Jun 22 1994 02:18:57:450PM 940622017 Steve Golovato Shot 940622017 - good shot, rf still interrupts occasionally.
density appears to drop during rf, as does h_alpha.

Jun 22 1994 02:29:22:000PM 940622018 Steve Golovato Shot 940622018 - no rf, BiRa didn't initialize. good baseline shot for
scanning probe. disrupted early, at 810ms.

Jun 22 1994 03:05:37:960PM 940622019 Steve Golovato Shot 940622019 - good shot, many rf interrupts. lower power and take
another.

Jun 22 1994 03:07:10:830PM 940622020 Steve Golovato Shot 940622020 - lower pwer still interrupts. bump in density may
be H2 puff which is larger than we think.

Jun 22 1994 03:28:08:390PM 940622022 Steve Golovato Shot 940622022 - increased inner gap on this shot.
didn't see much of an effect, increase it some more (5mm increments
of clearin).

Jun 22 1994 03:49:14:550PM 940622023 Steve Golovato Shot 940622023 - no rf, shot disrupted at 770ms.
both shots wihtout rf have disrupted early, during the time the
rf would have been on.

Jun 22 1994 03:50:22:040PM 940622023 Steve Golovato Shot 940622023 - inner and outer gaps larger, x-point a little high.

Jun 22 1994 04:02:56:430PM 940622024 Steve Golovato Shot 940622024 - shot ran, inner and outer gaps 2cm, kappa=1.7.
rf 1.3 MW with some interrupts, loading 6 ohms. no disruption
unitl current rampdown. RF PREVENTS DISRUPTIONS!!!

Jun 22 1994 04:08:19:350PM 940622025 Steve Golovato Shot 940622025 - plasma disrupted before rf,675ms.
rf pulse shortened 50ms so scanning probe sweep at 950ms has no
rf effect.

Jun 22 1994 04:40:06:310PM 940622026 Steve Golovato Shot 940622026 - rf pulse 650-850ms. lower power.
ran well, plasma and rf. good scanning probe data.

Jun 22 1994 05:02:24:610PM 940622027 Steve Golovato Shot 940622027 - good shot, still disrupting at beginning of rampdown.

Jun 22 1994 05:03:04:720PM 940622028 Steve Golovato Shot 940622028 - disrupted at 900ms after rf pulse.

Physics Operator Comments

Jun 22 1994 09:05:15:590AM 940622001 Yuichi Takase RF Heating (diverted plasma)
After ECDC is turned off, saw puff of air.
This usually does not happen, but is reported to have happened
yesterday, too.
Fiducial, OK.

Jun 22 1994 09:38:15:070AM 940622002 Yuichi Takase Shot 002
Loaded 940617018, but shortened Ip flattop to 1.0sec.
Nice shot, diverted, 700kA, nel_04=8, 1MW RF.
Outer gap=2cm, kappa=1.7, but R_L drops fro, 10 to 5 Ohms.

Jun 22 1994 09:53:28:280AM 940622003 Yuichi Takase Shot 003
Loaded Horne's modified 940617018 with density feedback in wire 9.
Shortened Ip flattop to 1.0sec.
(Shot 002 may have been loaded incorrectly.)
Density feedback not doing anything yet.
Good plasma, disrupted during rampdown.

Jun 22 1994 10:04:26:420AM 940622004 Yuichi Takase Shot 004
Pasted the density waveform from shot 003 to look at
the error signal (still gain=0).
Good shot, disrupted during rampdown.

Jun 22 1994 10:23:54:600AM 940622005 Yuichi Takase Shot 005
No change.
Got lower density nel04=4.

Jun 22 1994 10:36:27:920AM 940622006 Yuichi Takase Shot 006
A little more gas at the end.
Nice shot, all the way down.
Two scans (during and after RF) of scanning probe.
Density rise during RF nel04=6-8.

Jun 22 1994 11:03:43:270AM 940622007 Yuichi Takase Shot 007
Low density shot nel04=4.
Scanning probe did not fire.

Jun 22 1994 11:35:21:640AM 940622008 Yuichi Takase Shot 008
Density feedback trace set to 3.5e19, but no gain.
H puff on 100V X 10msec at .31sec.
Added two more Ar puffs.
Plasma looks OK.

Jun 22 1994 11:42:47:500AM 940622009 Yuichi Takase Shot 009
Density feedback on with gain=1, reference set to 4e19.
RCUR moved out by .005 at 1sec to compensate for outer gap drift.
EF1 more positive during rampdown by 500A.
Density rise during RF nel04=4.5-6, RF interrupts.

Jun 22 1994 12:09:10:470PM 940622010 Yuichi Takase Shot 010
Horne thinks the density feedback is working, so set gain=2.
Increase H puff to 100V X 20msec.

Jun 22 1994 12:32:21:220PM 940622011 Yuichi Takase Shot 011
Increased ne program to 5 (was 4), gain=4,
add small density pulse at rampdown.
+500A more on EF1's at rampdown.
Plasma OK, blew OH1 fuse.

Jun 22 1994 12:44:37:830PM 940622012 Yuichi Takase Shot 012
ne program increased to 6.6, gain=3 (<0.4sec), gain=6 (>0.4sec).
forgot to load?
Looks similar to 011.

Jun 22 1994 01:00:16:900PM 940622013 Yuichi Takase Shot 013
H puff 100V X 40msec, died early.

Jun 22 1994 01:12:24:950PM 940622014 Yuichi Takase Shot 014
Repeat, died early again (too much gas).

Jun 22 1994 01:28:39:200PM 940622015 Yuichi Takase Shot 015
Programmed density waveform to ramp from 4@0.3s to 6.6@.5s.
Better, but got choked around 0.8sec.

Jun 22 1994 01:50:43:900PM 940622016 Yuichi Takase Shot 016
Programmed density waveform to ramp from 4@0.3s to 6.5@.6s.
Lasted till Ip rampdown.

Jun 22 1994 02:06:13:240PM 940622017 Yuichi Takase Shot 017
got rid of structures in gas programming.

Jun 22 1994 02:45:53:160PM 940622019 Yuichi Takase Shot 019
changed gain, 0@0.3s, ramping up to 6@0.4s

Jun 22 1994 02:57:58:950PM 940622020 Yuichi Takase Shot 020
same

Jun 22 1994 03:09:15:120PM 940622021 Yuichi Takase Shot 021
no H puff, the density rise @ 0.3sec was from H puff

Jun 22 1994 03:27:53:450PM 940622022 Yuichi Takase Shot 022
density feedback gain up to 8, faster density ramp, no H puff

Jun 22 1994 03:44:00:670PM 940622023 Yuichi Takase Shot 023
CLEARIN +0.005, large clearance on both sides, disrupted

Jun 22 1994 04:03:21:940PM 940622024 Yuichi Takase Shot 024
tweaks on gas programming and feedback.
Nice shot with 2cm inner and outer gaps, kappa=1.7.

Jun 22 1994 04:28:13:570PM 940622025 Yuichi Takase Shot 025
Repeat, scanning probe in, disrupted around 0.7sec

Jun 22 1994 07:21:19:450PM 940622026 Yuichi Takase Shot 026
Lots of tweaks during Ip rampdown
changes in RXL, ZXL, KAPPA, CLEARIN, RCUR, ZCUR
disrupted during rampdown

Jun 22 1994 08:08:07:930PM 940622027 Yuichi Takase Shot 027
repeat, disrupted during rampdown

Jun 22 1994 08:08:45:870PM 940622028 Yuichi Takase Shot 028
changes in RCUR, CLEARIN, EF1 during rampdown.
disrupted before rampdown.

Engineering Operator Comments

Shot Time Type Status Comment

1 08:48:32:050AM Plasma Ok plasma fiducial/good shot

2 09:05:52:150AM Plasma Ok ok plasma no fault

3 09:32:53:670AM Plasma Ok disruption @1.09sec no faults

4 09:55:10:780AM Plasma Ok disruption 1.125sec no faults

5 10:11:03:950AM Plasma Ok disruption 1.0868 no faults

6 10:28:33:290AM Plasma Ok plasma no disruption

7 10:48:29:680AM Plasma Ok disruption 1.056 no faults

8 11:14:29:940AM Plasma Ok dispruption >1.0 no faults

9 11:33:29:590AM Plasma Ok disruption nofaults>1.0sec

10 11:48:11:850AM Plasma Ok disruption >1.0sec no faults

11 12:05:23:110PM Plasma Ok oh1 comm fail blwn fuse see log

12 12:29:31:680PM Plasma Ok disruption >1.sec no faults

13 12:45:06:030PM Plasma Ok disruption 0.465sec no faults

14 12:57:48:330PM Plasma Ok same as 13

15 01:12:45:590PM Plasma Ok disruption 0.8sec no faults

16 01:26:40:220PM Plasma Ok disruption <1.0sec no faults

17 01:47:19:560PM Plasma Ok disruption >1 sec no faults

18 02:07:00:720PM Plasma Ok disrupt at .81 sec

19 02:22:34:340PM Plasma Ok disruption at 1.1 seconds

20 02:36:34:930PM Plasma Ok disruption at 1.1 seconds

21 02:51:14:650PM Plasma Ok 720 ka

22 03:07:45:530PM Plasma Ok disruption at 1.09 seconds

23 03:25:47:840PM Plasma Ok disrupt .76 sec

24 03:45:48:780PM Plasma Ok no faults

25 04:02:48:260PM Plasma Ok no faults

26 04:23:19:700PM Plasma Ok no faults

27 04:38:18:610PM Plasma Ok no faults

28 04:56:03:860PM Plasma Ok oh2u and oh1 comm faults after disruption

Session Leader Comments
Jun 22 1994 09:19:37:270AM		Steve Golovato	Run - 940622 - rf run Goals - 1) couple high power to diverted plasmas. 2) get fast scanning probe edge profiles with and without rf, limited and diverted. 3) get first chaarge exchange data (diagnostic checkout)
Jun 22 1994 09:20:16:780AM	940622001	Steve Golovato	fiducial shot ran well but rf interrupted, tuning wasn't chosen for this shot.
Jun 22 1994 09:38:45:950AM	940622002	Steve Golovato	Shot 940622002 - good diverted shot, inner gap a little small, 1.5cm. loading about 6 Ohms, 1 MW rf power, 28 kV.
Jun 22 1994 09:49:36:040AM	940622003	Steve Golovato	Shot 940622003 - tweeked up rf power, tuning was very good last shot, rho_V =.07-.14 last shot. another good shot, 1.1MW, 31kV.
Jun 22 1994 10:07:03:620AM	940622004	Steve Golovato	Shot 940622004 - tweeked up power, added ramp to try to keep power constant during pulse. between 600-800ms equilibrium goes from upper null to double null to lower null divertor, get bursts on h_alpha during this time.
Jun 22 1994 10:24:09:070AM	940622005	Steve Golovato	Shot 940622005 - more power. another good shot, 1.4MW,35kV desnity about half of last shot for some reason, loading a little lower, 5.7Ohms.
Jun 22 1994 10:53:27:980AM	940622006	Steve Golovato	Shot 940622006 - 1.4MW, 36kV. fast scanning probe scanning at 750ms (with rf) and 900ms (after rf).
Jun 22 1994 11:06:45:730AM	940622007	Steve Golovato	Shot 940622007 - low density shot again. 1.5MW, 36kV. delta(Ti)=1000eV from hirex and neutrons. delta(Te)=500eV.
Jun 22 1994 11:31:24:110AM	940622008	Steve Golovato	Shot 940622008 - loading only 5 Ohms, rf interrupting., 38kV.
Jun 22 1994 11:45:55:540AM	940622009	Steve Golovato	Shot 940622009 - trying density feedback this shot. also moved plasma out a little. lots of rf interrupts, 38.5kV try tuning a little. puffig H2 for the last few shots, increase for next shot.
Jun 22 1994 12:29:58:410PM	940622010	Steve Golovato	Shot 940622010 - rf interrupting, lower power, but still 39kV. tune a little more.
Jun 22 1994 12:48:03:980PM	940622011	Steve Golovato	Shot 940622011 - rf still interrupts. density feedback appears to be working. rasie density to get loading up, lower rf voltage.
Jun 22 1994 12:48:31:780PM	940622012	Steve Golovato	Shot 940622012 - repeat of 11,
Jun 22 1994 12:59:04:680PM	940622013	Steve Golovato	Shot 940622013 - disrupted starting at 400ms.
Jun 22 1994 01:11:40:580PM	940622014	Steve Golovato	Shot 940622014 - same as previous shot, having problem at oh crossover, current never come out of hesitation. seems related to density feedback which comes on too hard at 300ms. we both icreased gain and increased density level, need to bring up density more slowly.
Jun 22 1994 01:28:36:820PM	940622015	Steve Golovato	Shot 940622015 - worked. but short rf pulse 40ms, 1.7MW. had fpa screen current overload. density higher as programmed.
Jun 22 1994 01:46:14:130PM	940622016	Steve Golovato	Shot 940622016 - loading higher, 8 ohms. 1.8MW, 33kV at higher loading.
Jun 22 1994 01:48:47:730PM	940622016	Steve Golovato	Shot 940622016 - loading higher, 8 ohms. 1.8MW, 33kV at higher loading.
Jun 22 1994 02:18:57:450PM	940622017	Steve Golovato	Shot 940622017 - good shot, rf still interrupts occasionally. density appears to drop during rf, as does h_alpha.
Jun 22 1994 02:29:22:000PM	940622018	Steve Golovato	Shot 940622018 - no rf, BiRa didn't initialize. good baseline shot for scanning probe. disrupted early, at 810ms.
Jun 22 1994 03:05:37:960PM	940622019	Steve Golovato	Shot 940622019 - good shot, many rf interrupts. lower power and take another.
Jun 22 1994 03:07:10:830PM	940622020	Steve Golovato	Shot 940622020 - lower pwer still interrupts. bump in density may be H2 puff which is larger than we think.
Jun 22 1994 03:28:08:390PM	940622022	Steve Golovato	Shot 940622022 - increased inner gap on this shot. didn't see much of an effect, increase it some more (5mm increments of clearin).
Jun 22 1994 03:49:14:550PM	940622023	Steve Golovato	Shot 940622023 - no rf, shot disrupted at 770ms. both shots wihtout rf have disrupted early, during the time the rf would have been on.
Jun 22 1994 03:50:22:040PM	940622023	Steve Golovato	Shot 940622023 - inner and outer gaps larger, x-point a little high.
Jun 22 1994 04:02:56:430PM	940622024	Steve Golovato	Shot 940622024 - shot ran, inner and outer gaps 2cm, kappa=1.7. rf 1.3 MW with some interrupts, loading 6 ohms. no disruption unitl current rampdown. RF PREVENTS DISRUPTIONS!!!
Jun 22 1994 04:08:19:350PM	940622025	Steve Golovato	Shot 940622025 - plasma disrupted before rf,675ms. rf pulse shortened 50ms so scanning probe sweep at 950ms has no rf effect.
Jun 22 1994 04:40:06:310PM	940622026	Steve Golovato	Shot 940622026 - rf pulse 650-850ms. lower power. ran well, plasma and rf. good scanning probe data.
Jun 22 1994 05:02:24:610PM	940622027	Steve Golovato	Shot 940622027 - good shot, still disrupting at beginning of rampdown.
Jun 22 1994 05:03:04:720PM	940622028	Steve Golovato	Shot 940622028 - disrupted at 900ms after rf pulse.

Physics Operator Comments
Jun 22 1994 09:05:15:590AM	940622001	Yuichi Takase	RF Heating (diverted plasma) After ECDC is turned off, saw puff of air. This usually does not happen, but is reported to have happened yesterday, too. Fiducial, OK.
Jun 22 1994 09:38:15:070AM	940622002	Yuichi Takase	Shot 002 Loaded 940617018, but shortened Ip flattop to 1.0sec. Nice shot, diverted, 700kA, nel_04=8, 1MW RF. Outer gap=2cm, kappa=1.7, but R_L drops fro, 10 to 5 Ohms.
Jun 22 1994 09:53:28:280AM	940622003	Yuichi Takase	Shot 003 Loaded Horne's modified 940617018 with density feedback in wire 9. Shortened Ip flattop to 1.0sec. (Shot 002 may have been loaded incorrectly.) Density feedback not doing anything yet. Good plasma, disrupted during rampdown.
Jun 22 1994 10:04:26:420AM	940622004	Yuichi Takase	Shot 004 Pasted the density waveform from shot 003 to look at the error signal (still gain=0). Good shot, disrupted during rampdown.
Jun 22 1994 10:23:54:600AM	940622005	Yuichi Takase	Shot 005 No change. Got lower density nel04=4.
Jun 22 1994 10:36:27:920AM	940622006	Yuichi Takase	Shot 006 A little more gas at the end. Nice shot, all the way down. Two scans (during and after RF) of scanning probe. Density rise during RF nel04=6-8.
Jun 22 1994 11:03:43:270AM	940622007	Yuichi Takase	Shot 007 Low density shot nel04=4. Scanning probe did not fire.
Jun 22 1994 11:35:21:640AM	940622008	Yuichi Takase	Shot 008 Density feedback trace set to 3.5e19, but no gain. H puff on 100V X 10msec at .31sec. Added two more Ar puffs. Plasma looks OK.
Jun 22 1994 11:42:47:500AM	940622009	Yuichi Takase	Shot 009 Density feedback on with gain=1, reference set to 4e19. RCUR moved out by .005 at 1sec to compensate for outer gap drift. EF1 more positive during rampdown by 500A. Density rise during RF nel04=4.5-6, RF interrupts.
Jun 22 1994 12:09:10:470PM	940622010	Yuichi Takase	Shot 010 Horne thinks the density feedback is working, so set gain=2. Increase H puff to 100V X 20msec.
Jun 22 1994 12:32:21:220PM	940622011	Yuichi Takase	Shot 011 Increased ne program to 5 (was 4), gain=4, add small density pulse at rampdown. +500A more on EF1's at rampdown. Plasma OK, blew OH1 fuse.
Jun 22 1994 12:44:37:830PM	940622012	Yuichi Takase	Shot 012 ne program increased to 6.6, gain=3 (<0.4sec), gain=6 (>0.4sec). forgot to load? Looks similar to 011.
Jun 22 1994 01:00:16:900PM	940622013	Yuichi Takase	Shot 013 H puff 100V X 40msec, died early.
Jun 22 1994 01:12:24:950PM	940622014	Yuichi Takase	Shot 014 Repeat, died early again (too much gas).
Jun 22 1994 01:28:39:200PM	940622015	Yuichi Takase	Shot 015 Programmed density waveform to ramp from 4@0.3s to 6.6@.5s. Better, but got choked around 0.8sec.
Jun 22 1994 01:50:43:900PM	940622016	Yuichi Takase	Shot 016 Programmed density waveform to ramp from 4@0.3s to 6.5@.6s. Lasted till Ip rampdown.
Jun 22 1994 02:06:13:240PM	940622017	Yuichi Takase	Shot 017 got rid of structures in gas programming.
Jun 22 1994 02:45:53:160PM	940622019	Yuichi Takase	Shot 019 changed gain, 0@0.3s, ramping up to 6@0.4s
Jun 22 1994 02:57:58:950PM	940622020	Yuichi Takase	Shot 020 same
Jun 22 1994 03:09:15:120PM	940622021	Yuichi Takase	Shot 021 no H puff, the density rise @ 0.3sec was from H puff
Jun 22 1994 03:27:53:450PM	940622022	Yuichi Takase	Shot 022 density feedback gain up to 8, faster density ramp, no H puff
Jun 22 1994 03:44:00:670PM	940622023	Yuichi Takase	Shot 023 CLEARIN +0.005, large clearance on both sides, disrupted
Jun 22 1994 04:03:21:940PM	940622024	Yuichi Takase	Shot 024 tweaks on gas programming and feedback. Nice shot with 2cm inner and outer gaps, kappa=1.7.
Jun 22 1994 04:28:13:570PM	940622025	Yuichi Takase	Shot 025 Repeat, scanning probe in, disrupted around 0.7sec
Jun 22 1994 07:21:19:450PM	940622026	Yuichi Takase	Shot 026 Lots of tweaks during Ip rampdown changes in RXL, ZXL, KAPPA, CLEARIN, RCUR, ZCUR disrupted during rampdown
Jun 22 1994 08:08:07:930PM	940622027	Yuichi Takase	Shot 027 repeat, disrupted during rampdown
Jun 22 1994 08:08:45:870PM	940622028	Yuichi Takase	Shot 028 changes in RCUR, CLEARIN, EF1 during rampdown. disrupted before rampdown.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:48:32:050AM	Plasma	Ok	plasma fiducial/good shot
2	09:05:52:150AM	Plasma	Ok	ok plasma no fault
3	09:32:53:670AM	Plasma	Ok	disruption @1.09sec no faults
4	09:55:10:780AM	Plasma	Ok	disruption 1.125sec no faults
5	10:11:03:950AM	Plasma	Ok	disruption 1.0868 no faults
6	10:28:33:290AM	Plasma	Ok	plasma no disruption
7	10:48:29:680AM	Plasma	Ok	disruption 1.056 no faults
8	11:14:29:940AM	Plasma	Ok	dispruption >1.0 no faults
9	11:33:29:590AM	Plasma	Ok	disruption nofaults>1.0sec
10	11:48:11:850AM	Plasma	Ok	disruption >1.0sec no faults
11	12:05:23:110PM	Plasma	Ok	oh1 comm fail blwn fuse see log
12	12:29:31:680PM	Plasma	Ok	disruption >1.sec no faults
13	12:45:06:030PM	Plasma	Ok	disruption 0.465sec no faults
14	12:57:48:330PM	Plasma	Ok	same as 13
15	01:12:45:590PM	Plasma	Ok	disruption 0.8sec no faults
16	01:26:40:220PM	Plasma	Ok	disruption <1.0sec no faults
17	01:47:19:560PM	Plasma	Ok	disruption >1 sec no faults
18	02:07:00:720PM	Plasma	Ok	disrupt at .81 sec
19	02:22:34:340PM	Plasma	Ok	disruption at 1.1 seconds
20	02:36:34:930PM	Plasma	Ok	disruption at 1.1 seconds
21	02:51:14:650PM	Plasma	Ok	720 ka
22	03:07:45:530PM	Plasma	Ok	disruption at 1.09 seconds
23	03:25:47:840PM	Plasma	Ok	disrupt .76 sec
24	03:45:48:780PM	Plasma	Ok	no faults
25	04:02:48:260PM	Plasma	Ok	no faults
26	04:23:19:700PM	Plasma	Ok	no faults
27	04:38:18:610PM	Plasma	Ok	no faults
28	04:56:03:860PM	Plasma	Ok	oh2u and oh1 comm faults after disruption