Alcator C-Mod Run 990204 Information

Miniproposals

Miniproposal: 209

Date Filed: 1/4/1999

Title: Exercise the Flapper and Associated Diagnostics in Ohmic Discharges

First Author: Spencer Pitcher

Session Leader: Spencer Pitcher (shots 1-26)

Operators
Session leader(s):	Spencer Pitcher
Physics operator(s):	John Goetz
Engineering operator(s):	Frank Silva

Engineering Operator Run Comment
MP209/Goetz

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:18:930PM

Author: To Be Determined

RUN 990204 MP 209 Excercise the Flappers and Associated Diagnostics

PURPOSE:

Obtain information on, (1) effect of the flapper on neutral densities in
divertor and main chamber

(2) effect of flapper on argon screening

SCANS:

(1) shots 4 - 18: Ohmic density scan, fixed strike pt geometry, fixed
argon puff, looking at the effect on neutral pressures at various
locations and argon penetration factor as measured by HIREX and
divertor RGA.

(2) shots 19 - 22: Scan of strike pt location on plate for fixed plasma
density

(3) shots 23 - 25: Start discharge with flapper open, close abruptly at
1.0 s, continue density feedback past 1.0 s to maintain density and
to fuel the divertor plenum, effectively giving a transient
'puff and pump' experiment.

SUMMARY OF FINDINGS

(1) For the same plasma density, the main chamber pressures are unaffected
by the flapper. This is consistent with earlier conclusions that
main chamber pressure is determined primarily by main chamber recycling
and not by neutral escape from the divertor.

(2) Divertor pressure (B-Bottom) is reduced by a factor of approximately
two for flapper open, at all plasma densities.

(3) Divertor pressure at E-Bottom (which is an open divertor) is lower
than B-Bottom (by factor approx 2), and is only weakly affected
by the flapper (20%). This is what one would expect given that gas at E
is free to flow to the main chamber unimpeded.

(4) Argon penetration factor as defined by # Ar in plasma / # Ar atoms
released is on average a factor of 2 higher with flapper open.

(5) Transient 'Puff and Pump' (shots 23 - 25) to be analyzed still.

Spencer Pitcher

Physics Operator Summaries

Entered: Jul 7 2004 04:36:59:990PM

Author: To Be Determined

Physics operator summary for 990204

EO: Silva
PO: Goetz
SL: Pitcher

Run 990204 was in support of Mini-Proposal #209 - Exercise Flappers ...
The purpose of this experiment is to obtain preliminary information on flapper
operation, its effect on divertor and midplane gas pressures and on
argon/neon screening efficiency. In addition, a considerable number of
relevant diagnostics need to be checked out. Only Ohmic discharges are
considered.

The run today was a success. All shots with power supplies produced plasmas.
These went a long way toward fulfilling MP209. See the session leader's
summary for a discussion of the physics results.

Startup was not touched today and no between shot ECDC was performed. The
results were breakdowns around 6ms with good current rises (a few shots had
very slight hesitations). Most shots today disrupted in the ramp-down portion
of the discharge. This time was pushed out by slowing down the negative ramp
of the CLEARIN waveform. The disruptions that occured before ramp-down were
due either to aggressive gas puffing or the movement of the strike points up
to the nose area or some combination of both. The strike point was drifting
up the outer plate. This was fixed by drawing an anti-drifting waveform
and/or extending the EF2_BY_EF4 waveform to 1.4s. However, the outer strike
point did not get very deep into the divertor.

WARNING: The shots today are programmed for flat-top lasting to 1.4s. Shot 26
has a PG1 puff of 200ms @ 0.6s. Do not use this shot without removing
the puff.

Engineering, computing, and diagnostics today:
A convectron on the TCI gate valve was a bit loose. This caused the
gate valve to oscillate during shots, causing a loss of some channels.
This was remedied by forcing the gate valve to stay open. The EF3
fuse problem was "solved" and two test shots taken to make sure. The
OH1 pulled out after one disruption. Other than that, a good day
for the power systems. One CAMAC hang cleared by JAS. A few
intermittent data losses today.

Scorecard: 26 shots = 22 plasmas + 0 fizzles + 0 dud + 4 tests

Shot summary for Run 990204:

Load 990204000 (which was to be 990203017)
coldstart hybrid - everything loaded; all matrices respond

Shot change result
____ _____ ______
1 PLC test of EF3 +3000A, 0.1s pulse; o.k.

2 PLC test of EF3 +6000A, 1.0s pulse; o.k.

3 see above plasma; disr. @ 0.89; large density
increase @ 0.32; flappers open

4 close flappers plasma; disr. @ 1.6; steady-state shot

5 enable B-side-lower plasma; disr. @ 1.58; steady-state shot

6 back to NL04 feedback; copy plasma; disr. @ 1.62; TCI feedback
wire 14, seg 3 to wire 14, worked well
seg 2, draw 0.9e20

7 flappers open; less PG3 after plasma; disr. @ 1.7;
0.5s; slow CLEARIN in ramp down

8 NL04=0.6e20; less PG3 in seg 1; plasma; disr. @ 1.8; nl04=0.7e20;
continue the CLEARIN changes CLEARIN changes working

9 flappers closed; more CLEARIN plasma; disr. @ 1.84
changes

10 take an argon puff; turn off got the puff
p.s. and disable gas and fizz.

11 reset everything; NL04=1.3e20; plasma; disr. @ .62; injection @ .59
more PG3 in seg 1; extend NL04=1.1e20; wasn't taking the gas
CLEARIN integral gain in seg 3

12 more PG3 in segment 2 plasma; disr. @ .41; gassed to death??

13 NL04=1.2e20 and slow ramp rate; plasma; disr. @ 1.55; nl04=1.3e20
less PG3 in segs 1 and 2

14 no changes plasma; disr. @ 1.52; nl04=1.3e20 and
steady discharge

15 draw NL04=1.5e20 plasma; disr. @ 1.24; nl04=1.7e20; RF
on @ 1.2 -> density rise

16 no changes plasma; disr. @ 1.16; nl04=1.5->1.7e20

17 NL04=1.1e20; lower PG3 in seg2 plasma; disr. @ 1.69; nl03=1.1e20

18 NL04=0.75e20; lower PG3 in plasma; disr. @ 1.81; nl04=0.75e20
segs 1 and 2 steady-state shot

19 NL04=0.95e20; more PG3 in seg2; plasma; disr. @ 1.71; nl04=0.9e20;
lower ZXL to -.025 (was -.015) ZXL and RXL steady

20 no changes plasma; disr. @ 1.77; nl04=1.0e20

21 RXL=.002; ZXL=-[.024,.028,.03] plasma; disr. @ 1.75; osp moves up
@ [.65,1.16,1.4]s the plate @ 1s

22 no changes plasma; disr. @ 1.73; same osp behavior

23 close flappers @ 1.s plasma; disr. @ 1.8; density drop @ 1s

24 extend NL04 waveform to 1.4s plasma; disr. @ 1.73; density recovers
after flapper drop

25 NL04=1.45e20; more PG3 in seg 2 plasma; disr. @ 1.02; osp at nose

26 Ar puff; 30ms @ 0.3; 200ms @ 0.6 got the puffs

Session Leader Comments

Feb 4 1999 08:29:57:090AM Spencer Pitcher
RUN 990204 MP 209 Excercise the Flappers and Associated Diagnostics

PURPOSE:

Obtain information on, (1) effect of the flapper on neutral densities in
divertor and main chamber

(2) effect of flapper on argon screening

We will look at a range of plasma densities in Ohmic discharges.
We will run pairs of discharges, first with flapper closed for
the entire discharge and then flapper open in a comparison discharge.

plasmas: Ip = 0.8 MA (later 1.0 MA), Bt = 5.3 T, D2,
long flat (to >= 1.2 sec, depending
on volt-seconds, we would like long flat-tops for the divertor
argon signal to come to equilibrium)

nl04: feedback controlled density, start with 1.0e20 m-2,
go down to 0.5, go up to strong detachment density (2.0),
approximately 5 densities to be used

argon: standard puff at 0.3

key
diag's: all pressure gauges, div RGA, HIREX, chromex

Feb 4 1999 09:09:31:687AM 990204001 Spencer Pitcher test shot, flapper program tested ok (-3,0) V

Feb 4 1999 09:17:53:653AM 990204002 Spencer Pitcher test shot, flapper program tested ok (-3,0) V

Feb 4 1999 09:43:10:920AM 990204003 Spencer Pitcher plasma shot, flapper operated, all flaps open by t = -.1 s,
density takes off at time of divertor, rises to nl04 = 2.5

Feb 4 1999 09:46:28:187AM 990204004 Spencer Pitcher this shot ... turn off flaps
shot goes thru, no problem.....nl04 = 1.0 as requested

Feb 4 1999 10:19:05:920AM 990204005 Spencer Pitcher flaps closed, add argon, RF doing some conditioning.

fringe jump on nl04, RF doesn't seem to perturb

Feb 4 1999 10:35:25:000AM 990204006 Spencer Pitcher flapper closed, tci feedback, argon, RF conditioning
gas pressure gauges calibrated between discharges

Feb 4 1999 10:45:38:937AM 990204007 Spencer Pitcher flapper open, argon, tci worked, nl04 = 1.0, good

Feb 4 1999 11:08:15:200AM 990204008 Spencer Pitcher go down in density, nl04 = 0.6 requested, got 0.75
flapper open

Feb 4 1999 11:29:24:750AM 990204009 Spencer Pitcher go down in density, nl04 = 0.6 requested, got 0.7
flapper closed

Feb 4 1999 11:35:58:310AM 990204010 Spencer Pitcher non-plasma shot, calibration of Ar puff, pressure on fside (d2) = 0.022 mTorr
flapper closed

Feb 4 1999 11:46:55:640AM 990204011 Spencer Pitcher flapper closed
nl04 request 1.3, disrupt early

Feb 4 1999 12:10:35:763PM 990204012 Spencer Pitcher flapper closed
nl04 request 1.3, disrupt early

Feb 4 1999 12:43:38:000PM 990204013 Spencer Pitcher flapper closed
nl04 request 1.3, back off on valve, good!

Feb 4 1999 12:44:04:170PM 990204014 Spencer Pitcher flapper open
nl04 request 1.3, good!

Feb 4 1999 01:30:55:700PM 990204015 Spencer Pitcher flapper open
nl04 request 1.6, disrupt late in shot probably due to RF

Feb 4 1999 01:42:23:123PM 990204016 Spencer Pitcher flapper closed
nl04 request 1.6, disrupt during flat-top

Feb 4 1999 01:56:59:827PM 990204017 Spencer Pitcher flapper open
nl04 request 1.1, problem with nl04, but correct
density probably achieved

Feb 4 1999 02:18:49:827PM 990204018 Spencer Pitcher flapper closed
nl04 request 0.8
density 0.7 achieved

Feb 4 1999 02:45:11:903PM 990204019 Spencer Pitcher flapper closed
nl04 request 1.0
density 0.9 achieved
strike pt moved down to fmp #6

Feb 4 1999 03:18:35:293PM 990204020 Spencer Pitcher flapper open
nl04 request 1.0
strike pt moved down to fmp #6

Feb 4 1999 03:30:19:200PM 990204021 Spencer Pitcher flapper open
nl04 request 1.0
strike pt moved down to fmp #4

Feb 4 1999 03:50:22:280PM 990204022 Spencer Pitcher flapper closed
nl04 request 1.0
strike pt moved down to fmp #4

Feb 4 1999 04:05:37:793PM 990204023 Spencer Pitcher flapper starts open, closes at 1.0 s
nl04 request 1.0
strike pt moved down to fmp #4

valve stops at 1.0, discharge pumps out as flaps closed
(we are filling the divertor with gas)

Feb 4 1999 04:45:51:890PM 990204024 Spencer Pitcher flapper starts open, closes at 1.0 s
nl04 request 1.0
strike pt moved down to fmp #4

this time leave density feedback system going until end of shot

flapper closing at 1.0 s pumps out plasma, feedback not quite up to maintaining density

Feb 4 1999 04:52:57:467PM 990204025 Spencer Pitcher flapper starts open, closes at 1.0 s
nl04 request 1.5
strike pt moved down to fmp #4

this time leave density feedback system going until end of shot

density rises above request, dirty density limit
plasma disrupts just before flaps close at 1.0 s

Feb 4 1999 04:55:43:560PM 990204026 Spencer Pitcher Ar gas puff test (0.3 s same as during run, 0.6 s larger for divertor RGA)
no plasma

Physics Operator Comments

Feb 4 1999 08:07:15:950AM John Goetz Engineering Setup for Thursday, 990204

Overnight ECDC in D2

TF under hybrid control

Power supplies as on 990203016, BUT add 0.2s to all invert times,
both PFs and TF and to the fizzle detector time.

Gas setup - fill B-top with 6 psi of D2 Hybrid enabled
fill B-side lower with 1 psi of Ar Hybrid enabled
fill B-side upper with 20 psi of He for between-shot ECDC
fill C-side with 30 psi of D2 Hybrid enabled

Feb 4 1999 08:17:45:700AM John Goetz Physics setup for Run 990204
Mini-Proposal 209 -- Exercise the Flapper ...

Load from 9902032017 (this shot was not taken but stored
as 990204000 in pcs$data)

The purpose of this experiment is to obtain preliminary information on flapper operation, its
effect on divertor and midplane gas pressures and on argon/neon screening efficiency. In
addition, a considerable number of relevant diagnostics need to be checked out. Only Ohmic
discharges are considered.

Feb 4 1999 09:07:16:607AM 990204001 John Goetz Shot 990204001
remove the circuit from the EF3 supply that caused the fuse problem yesterday
and patch whatever is necessary
PLC test of EF3 fix

Results
o.k. for 3kA 0.1s pulse

Feb 4 1999 09:12:26:107AM 990204002 John Goetz Shot 990204002
PLC test of EF3 fix

Results
o.k. for 6kA 1.0s pulse

Feb 4 1999 09:29:14:717AM 990204003 John Goetz Shot 990204003
load 990204000 (which was to be 990203017)
waveforms and power supply inverts extended 0.2s

Results
plasma - disrupts @ 0.89s
breakdown @ 0.005s; good current rise
density increase @ 032s; divertor @ 0.25s; flappers were open before shot

Feb 4 1999 09:56:58:403AM 990204004 John Goetz Shot 990204004
close flappers

Results
plasma - disrupts @ 1.6s in rampdown
breakdown @ 0.005s; o.k. current rise
fiducialicious shot

Feb 4 1999 10:17:16:763AM 990204005 John Goetz Shot 990204005
enable B-side-lower argon puff

Results
plasma - disrupts @ 1.58s in rampdown
breakdown @ 0.005s; o.k. current rise

Feb 4 1999 10:30:11:950AM 990204006 John Goetz Shot 990204006
change over to NL04 feedback
copy wire 14, segment 3 to wire 14, segment 2 and redraw waveform to 0.9e20

Results
plasma - disrupts @ 1.62
breakdown @ 0.0057s; slight hesitation on current rise
TCI feedback worked
steady-state shot

Feb 4 1999 10:51:54:000AM 990204007 John Goetz Shot 990204007
lower PG3 after 0.5s
slow down CLEARIN ramp in ramp-down
open flappers

Results
plasma - disrupts @ 1.7 - remains diverted until disruption
breakdown @ 0.0056s; slight hesitation on current rise

Feb 4 1999 11:11:58:450AM 990204008 John Goetz Shot 990204008
NL04 = 0.6e20; lower PG3 in segment 1
slower CLEARIN in ramp-down

Results
plasma - disrupts @ 1.8 - remains diverted until disruption - good ramp down
breakdown @ 0.0056s; current rise o.k.
obtained NL04 = 0.7e20

Feb 4 1999 11:28:36:467AM 990204009 John Goetz Shot 990204009
close flappers
even more slower CLEARIN in ramp-down

Results
plasma - disrupts @ 1.83 - remains diverted until disruption - good ramp down
inner gap to 0 @ 1.75s - integral gain on CLEARIN is off
breakdown @ 0.0056s; good current rise
obtained NL04 = 0.67e20

Feb 4 1999 11:33:46:857AM 990204010 John Goetz Shot 990204010
argon gas puff test shot
disable all power supplies
fizzle detector on time = 0.8s
disable B-top and C-side gas valves

Results
puff of argon obtained
calibration is being undertaken

Feb 4 1999 11:50:52:577AM 990204011 John Goetz Shot 990204011
reset everything
NL04 = 1.3e20; more PG3 in segment 1
extend CLEARIN integral gain in segment 2

Results
plasma; disrupts @ 0.62; injection @ 0.58??
breakdown @ .0053; very good current rise
NL04 = 1.1e20; wasn't taking the gas

Feb 4 1999 12:13:33:043PM 990204012 John Goetz Shot 990204012
more PG3 in segment 2

Results
plasma; disrupts @ 0.41; pulled out the OH1
gassed to death??
breakdown @ .0053; current rise hesitation

Feb 4 1999 12:25:22:060PM 990204013 John Goetz Shot 990204013
slow NL04 ramp rate; NL04 = 1.2e20
less PG3 in segments 1 & 2

Results
plasma; disrupts @ 1.55 in ramp-down
breakdown @ .0053; current rise hesitation
NL04 = 1.3e20 with some dips and valleys

Feb 4 1999 12:44:40:840PM 990204014 John Goetz Shot 990204014
no changes

Results
plasma; disrupts @ 1.52 in ramp-down
breakdown @ .0053; slight current rise hesitation
NL04 = 1.3e20 and steady
steady-state shot

Feb 4 1999 01:26:36:700PM 990204015 John Goetz Shot 990204015
draw NL04 = 1.5e20

Results
plasma; disrupts @ 1.24 in ramp-down
RF on 1.2s - density begins to rise
breakdown @ .006; o.k. current rise
NL04 = 1.7e20 and steady
steady-state shot

Feb 4 1999 01:42:30:623PM 990204016 John Goetz Shot 990204016
no changes

Results
plasma; disrupts @ 1.16
breakdown @ .006; slight current rise hesitation
NL04 = 1.5e20 -> 1.7e20

Feb 4 1999 01:58:53:810PM 990204017 John Goetz Shot 990204017
NL04 = 1.1e20 & lower PG3 in segment 2

Results
plasma; disrupts @ 1.69
breakdown @ .006; slight current rise hesitation
nl03 = 1.1e20; something passed thru the TCI field of view, so only
channels 1-3 are available
steady-state shot

Feb 4 1999 02:16:12:390PM 990204018 John Goetz Shot 990204018
NL04 = 0.75e20 & lower PG3 in segments 1 & 2

Results
plasma; disrupts @ 1.81
breakdown @ .0057; slight current rise hesitation
nl04 = 0.75e20
steady-state shot
moly injection at 1.22s

Feb 4 1999 02:52:20:827PM 990204019 John Goetz Shot 990204019
NL04 = 0.95e20 & raise PG3 in segment 2

Results
plasma; disrupts @ 1.71
breakdown @ .0058; slight current rise hesitation
nl04 = 0.9e20
steady-state shot

Feb 4 1999 03:06:45:077PM 990204020 John Goetz Shot 990204020
no changes

Results
plasma; disrupts @ 1.77
breakdown @ .0058; good current rise
nl04 = 1.0e20
steady-state shot

Feb 4 1999 03:29:31:357PM 990204021 John Goetz Shot 990204021
RXL = .002
ZXL = [-.024,.028,-.03] @ [.65,1.16,1.4]s
this is an attempt to move the strike points down to the bottom of the plate
or even into the slot

Results
plasma; disrupts @ 1.75
breakdown @ .0058; good current rise
outer strike point is at -50cm until 1s and then it begins to move up the plate

Feb 4 1999 03:46:45:903PM 990204022 John Goetz Shot 990204022
no changes

Results
plasma; disrupts @ 1.73
breakdown @ .0058; good current rise
outer strike point is at -50cm until 0.94s and then it begins to move up the plate

Feb 4 1999 04:07:51:530PM 990204023 John Goetz Shot 990204023
close flappers during shot @ 1.0s

Results
plasma; disrupts @ 1.8
breakdown @ .0058; slight current rise hesitation
density drop @ 1s, presumably due to flapper closing

Feb 4 1999 04:30:30:500PM 990204024 John Goetz Shot 990204024
extend NL04 waveform to 1.4s

Results
plasma; disrupts @ 1.73 in ramp-down
breakdown @ .0058; good current rise
density drop @ 1s, presumably due to flapper closing, and then recovers from gas puff

Feb 4 1999 05:45:44:327PM 990204025 John Goetz Shot 990204025
NL04=1.5e20 and more PG3 in segment 2

Results
plasma; disrupts @ 1.02
breakdown @ .0058; good current rise
strike points at the nose -> disruption ??

Feb 4 1999 05:46:18:950PM 990204026 John Goetz Shot 990204026
argon puffs: 0.03s @ 0.3 and 0.2s @ 0.6s

Results:
got the puffs

Engineering Operator Comments

Shot Time Type Status Comment

1 09:01:19:467AM Test Ok ef3 plc control/1kv,7ka

2 09:09:04:653AM Test Ok EF3 test ok

3 09:17:16:280AM Plasma Ok No Faults

4 09:40:20:090AM Plasma Ok no faults/plasma

5 10:01:53:857AM Plasma Ok No Faults / plasma

6 10:19:55:687AM Plasma Ok No Faults / plasma

7 10:38:32:437AM Plasma Ok no faults/plasma

8 10:59:50:793AM Plasma Ok no faults

9 11:18:06:530AM Plasma Ok no faults/plasma

10 11:27:21:700AM Test Ok no power/gas puff test ok

11 11:39:54:640AM Test Ok no faults/plasma

12 12:03:39:793PM Plasma Ok oh1 self powered ckt. fired/

13 12:19:01:840PM Plasma Ok no faults/plasma

14 12:38:03:390PM Plasma Ok no faults/plasma

15 12:59:39:013PM Plasma Ok no faults/plasma

16 01:29:58:920PM Plasma Ok no faults/plasma

17 01:48:24:250PM Plasma Ok no faults/plasma

18 02:06:54:873PM Plasma Ok no faults/plasma

19 02:26:57:030PM Plasma Ok no faults/plasma

20 02:59:41:030PM Plasma Ok no faults/plasma

21 03:18:39:780PM Plasma Ok no faults/plasma

22 03:38:45:483PM Plasma Ok no faults/plasma

23 03:57:54:403PM Plasma Ok no faults/plasma

24 04:19:55:390PM Plasma Ok no faults/plasma

25 04:45:44:700PM Plasma Ok no faults/p

26 04:53:23:640PM Test Ok no power/ gas puff test ok

Session Leader Comments
Feb 4 1999 08:29:57:090AM		Spencer Pitcher	RUN 990204 MP 209 Excercise the Flappers and Associated Diagnostics PURPOSE: Obtain information on, (1) effect of the flapper on neutral densities in divertor and main chamber (2) effect of flapper on argon screening We will look at a range of plasma densities in Ohmic discharges. We will run pairs of discharges, first with flapper closed for the entire discharge and then flapper open in a comparison discharge. plasmas: Ip = 0.8 MA (later 1.0 MA), Bt = 5.3 T, D2, long flat (to >= 1.2 sec, depending on volt-seconds, we would like long flat-tops for the divertor argon signal to come to equilibrium) nl04: feedback controlled density, start with 1.0e20 m-2, go down to 0.5, go up to strong detachment density (2.0), approximately 5 densities to be used argon: standard puff at 0.3 key diag's: all pressure gauges, div RGA, HIREX, chromex
Feb 4 1999 09:09:31:687AM	990204001	Spencer Pitcher	test shot, flapper program tested ok (-3,0) V
Feb 4 1999 09:17:53:653AM	990204002	Spencer Pitcher	test shot, flapper program tested ok (-3,0) V
Feb 4 1999 09:43:10:920AM	990204003	Spencer Pitcher	plasma shot, flapper operated, all flaps open by t = -.1 s, density takes off at time of divertor, rises to nl04 = 2.5
Feb 4 1999 09:46:28:187AM	990204004	Spencer Pitcher	this shot ... turn off flaps shot goes thru, no problem.....nl04 = 1.0 as requested
Feb 4 1999 10:19:05:920AM	990204005	Spencer Pitcher	flaps closed, add argon, RF doing some conditioning. fringe jump on nl04, RF doesn't seem to perturb
Feb 4 1999 10:35:25:000AM	990204006	Spencer Pitcher	flapper closed, tci feedback, argon, RF conditioning gas pressure gauges calibrated between discharges
Feb 4 1999 10:45:38:937AM	990204007	Spencer Pitcher	flapper open, argon, tci worked, nl04 = 1.0, good
Feb 4 1999 11:08:15:200AM	990204008	Spencer Pitcher	go down in density, nl04 = 0.6 requested, got 0.75 flapper open
Feb 4 1999 11:29:24:750AM	990204009	Spencer Pitcher	go down in density, nl04 = 0.6 requested, got 0.7 flapper closed
Feb 4 1999 11:35:58:310AM	990204010	Spencer Pitcher	non-plasma shot, calibration of Ar puff, pressure on fside (d2) = 0.022 mTorr flapper closed
Feb 4 1999 11:46:55:640AM	990204011	Spencer Pitcher	flapper closed nl04 request 1.3, disrupt early
Feb 4 1999 12:10:35:763PM	990204012	Spencer Pitcher	flapper closed nl04 request 1.3, disrupt early
Feb 4 1999 12:43:38:000PM	990204013	Spencer Pitcher	flapper closed nl04 request 1.3, back off on valve, good!
Feb 4 1999 12:44:04:170PM	990204014	Spencer Pitcher	flapper open nl04 request 1.3, good!
Feb 4 1999 01:30:55:700PM	990204015	Spencer Pitcher	flapper open nl04 request 1.6, disrupt late in shot probably due to RF
Feb 4 1999 01:42:23:123PM	990204016	Spencer Pitcher	flapper closed nl04 request 1.6, disrupt during flat-top
Feb 4 1999 01:56:59:827PM	990204017	Spencer Pitcher	flapper open nl04 request 1.1, problem with nl04, but correct density probably achieved
Feb 4 1999 02:18:49:827PM	990204018	Spencer Pitcher	flapper closed nl04 request 0.8 density 0.7 achieved
Feb 4 1999 02:45:11:903PM	990204019	Spencer Pitcher	flapper closed nl04 request 1.0 density 0.9 achieved strike pt moved down to fmp #6
Feb 4 1999 03:18:35:293PM	990204020	Spencer Pitcher	flapper open nl04 request 1.0 strike pt moved down to fmp #6
Feb 4 1999 03:30:19:200PM	990204021	Spencer Pitcher	flapper open nl04 request 1.0 strike pt moved down to fmp #4
Feb 4 1999 03:50:22:280PM	990204022	Spencer Pitcher	flapper closed nl04 request 1.0 strike pt moved down to fmp #4
Feb 4 1999 04:05:37:793PM	990204023	Spencer Pitcher	flapper starts open, closes at 1.0 s nl04 request 1.0 strike pt moved down to fmp #4 valve stops at 1.0, discharge pumps out as flaps closed (we are filling the divertor with gas)
Feb 4 1999 04:45:51:890PM	990204024	Spencer Pitcher	flapper starts open, closes at 1.0 s nl04 request 1.0 strike pt moved down to fmp #4 this time leave density feedback system going until end of shot flapper closing at 1.0 s pumps out plasma, feedback not quite up to maintaining density
Feb 4 1999 04:52:57:467PM	990204025	Spencer Pitcher	flapper starts open, closes at 1.0 s nl04 request 1.5 strike pt moved down to fmp #4 this time leave density feedback system going until end of shot density rises above request, dirty density limit plasma disrupts just before flaps close at 1.0 s
Feb 4 1999 04:55:43:560PM	990204026	Spencer Pitcher	Ar gas puff test (0.3 s same as during run, 0.6 s larger for divertor RGA) no plasma

Physics Operator Comments
Feb 4 1999 08:07:15:950AM		John Goetz	Engineering Setup for Thursday, 990204 Overnight ECDC in D2 TF under hybrid control Power supplies as on 990203016, BUT add 0.2s to all invert times, both PFs and TF and to the fizzle detector time. Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled fill B-side upper with 20 psi of He for between-shot ECDC fill C-side with 30 psi of D2 Hybrid enabled
Feb 4 1999 08:17:45:700AM		John Goetz	Physics setup for Run 990204 Mini-Proposal 209 -- Exercise the Flapper ... Load from 9902032017 (this shot was not taken but stored as 990204000 in pcs$data) The purpose of this experiment is to obtain preliminary information on flapper operation, its effect on divertor and midplane gas pressures and on argon/neon screening efficiency. In addition, a considerable number of relevant diagnostics need to be checked out. Only Ohmic discharges are considered.
Feb 4 1999 09:07:16:607AM	990204001	John Goetz	Shot 990204001 remove the circuit from the EF3 supply that caused the fuse problem yesterday and patch whatever is necessary PLC test of EF3 fix Results o.k. for 3kA 0.1s pulse
Feb 4 1999 09:12:26:107AM	990204002	John Goetz	Shot 990204002 PLC test of EF3 fix Results o.k. for 6kA 1.0s pulse
Feb 4 1999 09:29:14:717AM	990204003	John Goetz	Shot 990204003 load 990204000 (which was to be 990203017) waveforms and power supply inverts extended 0.2s Results plasma - disrupts @ 0.89s breakdown @ 0.005s; good current rise density increase @ 032s; divertor @ 0.25s; flappers were open before shot
Feb 4 1999 09:56:58:403AM	990204004	John Goetz	Shot 990204004 close flappers Results plasma - disrupts @ 1.6s in rampdown breakdown @ 0.005s; o.k. current rise fiducialicious shot
Feb 4 1999 10:17:16:763AM	990204005	John Goetz	Shot 990204005 enable B-side-lower argon puff Results plasma - disrupts @ 1.58s in rampdown breakdown @ 0.005s; o.k. current rise
Feb 4 1999 10:30:11:950AM	990204006	John Goetz	Shot 990204006 change over to NL04 feedback copy wire 14, segment 3 to wire 14, segment 2 and redraw waveform to 0.9e20 Results plasma - disrupts @ 1.62 breakdown @ 0.0057s; slight hesitation on current rise TCI feedback worked steady-state shot
Feb 4 1999 10:51:54:000AM	990204007	John Goetz	Shot 990204007 lower PG3 after 0.5s slow down CLEARIN ramp in ramp-down open flappers Results plasma - disrupts @ 1.7 - remains diverted until disruption breakdown @ 0.0056s; slight hesitation on current rise
Feb 4 1999 11:11:58:450AM	990204008	John Goetz	Shot 990204008 NL04 = 0.6e20; lower PG3 in segment 1 slower CLEARIN in ramp-down Results plasma - disrupts @ 1.8 - remains diverted until disruption - good ramp down breakdown @ 0.0056s; current rise o.k. obtained NL04 = 0.7e20
Feb 4 1999 11:28:36:467AM	990204009	John Goetz	Shot 990204009 close flappers even more slower CLEARIN in ramp-down Results plasma - disrupts @ 1.83 - remains diverted until disruption - good ramp down inner gap to 0 @ 1.75s - integral gain on CLEARIN is off breakdown @ 0.0056s; good current rise obtained NL04 = 0.67e20
Feb 4 1999 11:33:46:857AM	990204010	John Goetz	Shot 990204010 argon gas puff test shot disable all power supplies fizzle detector on time = 0.8s disable B-top and C-side gas valves Results puff of argon obtained calibration is being undertaken
Feb 4 1999 11:50:52:577AM	990204011	John Goetz	Shot 990204011 reset everything NL04 = 1.3e20; more PG3 in segment 1 extend CLEARIN integral gain in segment 2 Results plasma; disrupts @ 0.62; injection @ 0.58?? breakdown @ .0053; very good current rise NL04 = 1.1e20; wasn't taking the gas
Feb 4 1999 12:13:33:043PM	990204012	John Goetz	Shot 990204012 more PG3 in segment 2 Results plasma; disrupts @ 0.41; pulled out the OH1 gassed to death?? breakdown @ .0053; current rise hesitation
Feb 4 1999 12:25:22:060PM	990204013	John Goetz	Shot 990204013 slow NL04 ramp rate; NL04 = 1.2e20 less PG3 in segments 1 & 2 Results plasma; disrupts @ 1.55 in ramp-down breakdown @ .0053; current rise hesitation NL04 = 1.3e20 with some dips and valleys
Feb 4 1999 12:44:40:840PM	990204014	John Goetz	Shot 990204014 no changes Results plasma; disrupts @ 1.52 in ramp-down breakdown @ .0053; slight current rise hesitation NL04 = 1.3e20 and steady steady-state shot
Feb 4 1999 01:26:36:700PM	990204015	John Goetz	Shot 990204015 draw NL04 = 1.5e20 Results plasma; disrupts @ 1.24 in ramp-down RF on 1.2s - density begins to rise breakdown @ .006; o.k. current rise NL04 = 1.7e20 and steady steady-state shot
Feb 4 1999 01:42:30:623PM	990204016	John Goetz	Shot 990204016 no changes Results plasma; disrupts @ 1.16 breakdown @ .006; slight current rise hesitation NL04 = 1.5e20 -> 1.7e20
Feb 4 1999 01:58:53:810PM	990204017	John Goetz	Shot 990204017 NL04 = 1.1e20 & lower PG3 in segment 2 Results plasma; disrupts @ 1.69 breakdown @ .006; slight current rise hesitation nl03 = 1.1e20; something passed thru the TCI field of view, so only channels 1-3 are available steady-state shot
Feb 4 1999 02:16:12:390PM	990204018	John Goetz	Shot 990204018 NL04 = 0.75e20 & lower PG3 in segments 1 & 2 Results plasma; disrupts @ 1.81 breakdown @ .0057; slight current rise hesitation nl04 = 0.75e20 steady-state shot moly injection at 1.22s
Feb 4 1999 02:52:20:827PM	990204019	John Goetz	Shot 990204019 NL04 = 0.95e20 & raise PG3 in segment 2 Results plasma; disrupts @ 1.71 breakdown @ .0058; slight current rise hesitation nl04 = 0.9e20 steady-state shot
Feb 4 1999 03:06:45:077PM	990204020	John Goetz	Shot 990204020 no changes Results plasma; disrupts @ 1.77 breakdown @ .0058; good current rise nl04 = 1.0e20 steady-state shot
Feb 4 1999 03:29:31:357PM	990204021	John Goetz	Shot 990204021 RXL = .002 ZXL = [-.024,.028,-.03] @ [.65,1.16,1.4]s this is an attempt to move the strike points down to the bottom of the plate or even into the slot Results plasma; disrupts @ 1.75 breakdown @ .0058; good current rise outer strike point is at -50cm until 1s and then it begins to move up the plate
Feb 4 1999 03:46:45:903PM	990204022	John Goetz	Shot 990204022 no changes Results plasma; disrupts @ 1.73 breakdown @ .0058; good current rise outer strike point is at -50cm until 0.94s and then it begins to move up the plate
Feb 4 1999 04:07:51:530PM	990204023	John Goetz	Shot 990204023 close flappers during shot @ 1.0s Results plasma; disrupts @ 1.8 breakdown @ .0058; slight current rise hesitation density drop @ 1s, presumably due to flapper closing
Feb 4 1999 04:30:30:500PM	990204024	John Goetz	Shot 990204024 extend NL04 waveform to 1.4s Results plasma; disrupts @ 1.73 in ramp-down breakdown @ .0058; good current rise density drop @ 1s, presumably due to flapper closing, and then recovers from gas puff
Feb 4 1999 05:45:44:327PM	990204025	John Goetz	Shot 990204025 NL04=1.5e20 and more PG3 in segment 2 Results plasma; disrupts @ 1.02 breakdown @ .0058; good current rise strike points at the nose -> disruption ??
Feb 4 1999 05:46:18:950PM	990204026	John Goetz	Shot 990204026 argon puffs: 0.03s @ 0.3 and 0.2s @ 0.6s Results: got the puffs

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:01:19:467AM	Test	Ok	ef3 plc control/1kv,7ka
2	09:09:04:653AM	Test	Ok	EF3 test ok
3	09:17:16:280AM	Plasma	Ok	No Faults
4	09:40:20:090AM	Plasma	Ok	no faults/plasma
5	10:01:53:857AM	Plasma	Ok	No Faults / plasma
6	10:19:55:687AM	Plasma	Ok	No Faults / plasma
7	10:38:32:437AM	Plasma	Ok	no faults/plasma
8	10:59:50:793AM	Plasma	Ok	no faults
9	11:18:06:530AM	Plasma	Ok	no faults/plasma
10	11:27:21:700AM	Test	Ok	no power/gas puff test ok
11	11:39:54:640AM	Test	Ok	no faults/plasma
12	12:03:39:793PM	Plasma	Ok	oh1 self powered ckt. fired/
13	12:19:01:840PM	Plasma	Ok	no faults/plasma
14	12:38:03:390PM	Plasma	Ok	no faults/plasma
15	12:59:39:013PM	Plasma	Ok	no faults/plasma
16	01:29:58:920PM	Plasma	Ok	no faults/plasma
17	01:48:24:250PM	Plasma	Ok	no faults/plasma
18	02:06:54:873PM	Plasma	Ok	no faults/plasma
19	02:26:57:030PM	Plasma	Ok	no faults/plasma
20	02:59:41:030PM	Plasma	Ok	no faults/plasma
21	03:18:39:780PM	Plasma	Ok	no faults/plasma
22	03:38:45:483PM	Plasma	Ok	no faults/plasma
23	03:57:54:403PM	Plasma	Ok	no faults/plasma
24	04:19:55:390PM	Plasma	Ok	no faults/plasma
25	04:45:44:700PM	Plasma	Ok	no faults/p
26	04:53:23:640PM	Test	Ok	no power/ gas puff test ok