Alcator C-Mod Run 951128 Information

Miniproposals

Miniproposal:

Date Filed:

Title:

First Author:

Session Leader: Steve Golovato (shots 8-35)

Miniproposal: 062

Date Filed: 6/16/1994

Title: PCX Beast commissioning

First Author: Rejean Boivin

Session Leader: Rejean Boivin (shots 1-8)

Operators
Session leader(s):	Rejean Boivin,Steve Golovato
Physics operator(s):	John Goetz
Engineering operator(s):	Vinny Bertolino

Engineering Operator Run Comment
beast

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:14:210PM

Author: To Be Determined

run summary - 951128
---------------------
SL: boivin/golovato
PO: goetz
EO: bertolino

The run was to be split between pcx calibration and rf conditioning. The pcx
went down at shot 8 with hvps problems, so rf took over. tci was down all day
so we controlled density with the visible bremstrahlung signal and got density
from ts. This worked fine, though shot-to-shot reproducibility was still not
great (see physics operator summary). We continued the process begun in run
951117 of bringing the two rf systems up to reliable high power operation. We
had succeeded in getting high power (1.4MW) from d-port but had not yet tuned
e-port correctly (see run summary 951117). Tuning e-port as explained in that
summary (but not tried) proved correct and put us close enough to quickly match
e-port. Within 2 plasma shots we had 0.4 MW and 2 plasma shots later over 1MW.
Shots 19, 21, 22, 24, 25 had over 1MW from each system, but not simultaneously.
We overlapped the power for shot 31, getting over 2.5MW for a short time,
with h-mode leading to tripping of the rf. Meanwhile the d2 pellet
team was firing away at 1sec. On shot 33 we tried to get pep mode with a
pellet at 0.7sec and rf soon after. This was not successful and we didn't get
another plasma to try it again. We still need to demonstrate reliable
high power operation (>1.5MW for each system) and simultaneous operation.
This is left for the next run.

For information on engineering problems and shot statistics, see the physics
operator summary. For shot-to-shot comments, see the logbook under the
session_leader topic.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:55:440PM

Author: To Be Determined

Physics operator summary for 951128

EO: Bertolino
PO: Goetz
SL: Boivin/Golovato

Run 951128 was in support of Mini-Proposals #62 - Beast Commisioning
and #102 - RF Conditioning. The goals of these mini-proposals
are to check out diagnostics and bring the RF on the air.

Program for this run:
- Set up a shot acceptable to the various experimenters and repeat
until everyone is satisfied. Time will also be spent working on
a fiducial shot.

Some things discovered today:
1) Suitable plasmas were obtained to satisfy almost everyone today.
2) Deuterium pellets were fired today, mostly into rampdown plasmas, but
a pellet was fired pre-RF on 033.
3) Puffed prefill was used again today with 13msec of puffed prefill.
There were large amounts of molybdenum being generated early in
some discharges. Increasing the gas voltage programming in segment 1
reduced the moly, but the current rise was beginning to be affected by
the extra gas load. Also, some shots had saturated Dalpha signals
before the plasma became well diverted. This was cured by holding RXL
approximately 5mm further out before the plasma became well diverted.
4) Once again the machine was in the plasma/fizzle alternating mode. Then
it progressed to two plasmas/fizzle mode. Most shots today had
disruptions in the ramp-down due to the D pellet injection. Most
shots pre-pellet did ramp all the way down, as did the shot with the
pellet fired pre-RF.
5) Shots 027-030 and Shots 034 were attempts to reproduce the breakdown
behavior seen on Shot 951117027 (breakdown at .003s, fast current rise,
etc.). These shots used voltage spikes programmed on the OH1 and OH2
supplies to mimic the conditions of 951117027. Current rises are very
fast (see shot 034) but the vertical field does not come in quickly
enough to 'catch' the forming plasma. The commutation time for the
OH2 and EF1 coils were changed to +.0005seconds. This change reduced
the 'lurch' seen in Bz during most breakdowns. Some more work needs
to be done to perfect this startup scenario, but the results from today
are promising.
6) None of the shots today are suitable for 'fiducial' status because
of the lack of TCI data, although shot 009 may be a suitable candidate
for further massaging.
7) 'NEW_PCS' was used today and no bugs were tickled.

Engineering, computing, and diagnostics today: Engineering tests were
performed on shots 001-004 to determine which board in the TF cabinets
was causing the comm faults that weren't really there, to check the
changes to the EF3 supply, and to measure the OH coax resistance.
The misbehaving board was identified and all other changes were fine.
After these shots, engineering was flawless. There were many shots with
multiple CAMAC errors. Most data were saved though by JAS. TCI was
not functional today. Post-run work is under way to remedy the
problems. As a consequence, the whole run was performed with z_meter
controlled density feedback. The CX experiments were rendered useless
today by power supply problems.

Scorecard: 34 shots = 14 plasmas + 16 fizzles + 4 tests

Shot summary for Run 951128:

Reload of 951117029:
NL_ZMETER feedback on density (chiller problem on TCI)
ZXL = -.015 (was -.01)
RXL = -.005 (was -.002)
coldstart hybrid - all matrices respond after a kick-start from TWF

Shot change result
____ _____ ______
1 eng. test shot for TF asked for 0kA, got 4kA

2 eng. test shot for TF TF crowbar @ -.065

3 OH test shot resistance o.k.

4 TF and EF3 test shot no crowbar - EF3 changes o.k.

5 puff pre-fill fizzle - lurch in Bz at commutation

6 IC_EF4 = -1135A plasma - all the way down
copious data system errors

7 no changes fizzle - Br too negative, Bz coming
in too quickly

8 BR_0 offset = .008 (was .007); plasma - all the way down
OH2L and OH2U voltage = 6.5V ZXL drifting up a bit toward the end
@ .005 to .01sec (was 7.5V)

9 RCUR=.667; ZXL ramp to -.02 plasma - all the way down

10 RCUR=.666; NL_ZMETER=.95 fizzle

11 lower OH2 commutation voltage plasma - disr. @ 1.20 - fin, then death
by 100V to 1000V

12 lower OH2 comm. voltage to 900V very weak fizzle - no OH2 commutation

13 OH2 comm voltage back to 1100V fizzle

14 no changes plasma - disr. @ 1.33

15 V_OH1=180V from .005 to .015; plasma - all the way down
turn off density @ .0925 hesitation in current rise

16 V_OH1=130V @ .015s; hold RXL fizzle
outside early in the discharge

17 OH2 comm. time to +0.0005; plasma - disr. @ 1.25; D pellet death
V_OH1 = 130V from .005 to .015 early Dalpha better but still there

18 hold ZXL out further early fizzle - CII level high??

19 BR_0 = .0075 plasma - disr. @ 1.22; D pellet @ 1.02

20 IC_EF4=-1120A; RXL=+.002 early; fizzle - Bz too positive??
EF1 comm. time = +0.0005

21 IC_EF4=-1135A plasma - disr. @ 1.34
no current hesitation, but the Bz
lurch is still there

22 NL_ZMETER = 1.35 plasma - disr. @ 1.29; huge Mo inj.
at 0.44; good current rise

23 add some gas in seg. 1 fizzle - ???

24 no changes plasma - disr. @ 1.21; less Mo early

25 more gas in segment 1 plasma - disr. @ 1.16; less Mo early,
but beginning to hamper the curr. rise

26 more gas volts in seg 2 fizzle - CII stays above .02

27 no changes fizzle - CII higher than 026; nice
null but before t=0

28 V_OH1=-200V from -.009-> -.007 fizzle - b.d. @ .004; lurch in Bz is
and +225V from -.001 to +.003 gone; Bz not coming in fast enough

29 V_OH1=30V from .005 to .015 fizzle - b.d. @ .004; Bz not coming in
fast enough

30 slide V_OH1 waveform 3msec fizzle - feeble b.d. @ .004; Bz just
earlier (from -.02 to +.005) not coming in; V_OH1 tweaks affected
OH2's and the null this time

31 reload 951128027 plasma - disr. @ 1.16; early moly up

32 add 1msec to prefill puff and fizzle

33 no changes plasma - disr. @ 1.45

34 IC_OH1=-17100; V_OH1=+250V fizzle - b.d. @ .004
from -.004 to +.001; V_OH2=30V didn't catch it right with Bz
from -.004 to +.001 OH1 current didn't get to its req. value
add gas in segment 1

Session Leader Comments

Nov 28 1995 08:10:10:420AM Rejean Boivin We have 3 topics for today's run.

1) Establish a reasonable fiducial shot.

2) Finish cross-calibration of the PCX (Beast).

3) Continue RF conditioning.

We will attempt to have reproducible discharges, for all 3
topics, 800 kA, density will be either 1e20 for fiducial
and higher power RF, and 7e19 for PCX and low power RF.

Nov 28 1995 12:23:33:570PM Steve Golovato run goals - cx cal dropped, pcx lost hv ps.
rf inherited run at shot 008.

rf goals are:

get both systems up to reliable high power (>1.5mw)

establish fiducial shot conditions.

get rf diagnostics working.

Nov 28 1995 12:24:32:160PM 951128001 Steve Golovato shot 951128001 -

tf test

Nov 28 1995 12:24:49:520PM 951128002 Steve Golovato shot 951128002 -

tf test, crowbar

Nov 28 1995 12:25:06:910PM 951128003 Steve Golovato shot 951128003 -

oh test, good.

Nov 28 1995 12:25:22:480PM 951128004 Steve Golovato shot 951128004 -

TF and EF3 test. Good

Nov 28 1995 09:39:34:790AM 951128005 Rejean Boivin We have 3 topics for today's run.
First plasma attempt.
Fiducial at 1e20.

Fizzle

Nov 28 1995 12:25:38:390PM 951128005 Steve Golovato shot 951128005 -

Plasma Attempt, fiducial. Fizzle.

Nov 28 1995 12:25:58:260PM 951128006 Steve Golovato shot 951128006 -

Good plasma.

Nov 28 1995 12:26:06:280PM 951128006 Steve Golovato shot 951128006 -

Good plasma.

Nov 28 1995 12:26:08:050PM 951128006 Steve Golovato shot 951128006 -

Good plasma.

Nov 28 1995 12:26:09:330PM 951128006 Steve Golovato shot 951128006 -

Good plasma.

Nov 28 1995 12:26:50:370PM 951128006 Steve Golovato shot 951128006 -

Good plasma. e-port tuning looks better,
should be able to tune to match.

Nov 28 1995 12:27:04:890PM 951128007 Steve Golovato shot 951128007 -

Fizzle

Nov 28 1995 10:39:10:900AM 951128008 Rejean Boivin We have 3 topics for today's run.

Good plasma.
PCX (beast) HV power supply not responding. Revert run
to Fiducial development and RF conditioning.

Nov 28 1995 12:29:10:910PM 951128008 Steve Golovato shot 951128008 -

Good plasma, Have problem with PCX HV power supply. Will
revert to Fiducial development and RF conditioning.

e-port better, d-port at 1.25mw.

Nov 28 1995 12:29:47:090PM 951128009 Steve Golovato shot 951128009 -

Good plasma, e-port 0.4mw

Nov 28 1995 12:30:04:890PM 951128010 Steve Golovato shot 951128010 -

fizzle

Nov 28 1995 12:30:39:110PM 951128011 Steve Golovato shot 951128011 -

plasma, e-port 0.8mw, d-port transmitter tripping at 1.3mw

Nov 28 1995 12:30:55:030PM 951128012 Steve Golovato shot 951128012 -

fizzle

Nov 28 1995 12:31:06:650PM 951128013 Steve Golovato shot 951128013 -

fizzle

Nov 28 1995 12:34:54:170PM 951128014 Steve Golovato shot 951128014 -

plasma. d-port tripped at turnoff, at 1mw.
e-port 1.3mw with some trips.

loading, voltages the same on the two antennas now that they
have the same coax circuits, e is now like d with higher loading,
lower voltages.

Nov 28 1995 12:36:15:590PM 951128015 Steve Golovato shot 951128015 -

plasma. d-port at 1mw, no trips.
e-port 1.2mw with trips at highest power.

Nov 28 1995 12:48:59:100PM 951128015 Steve Golovato shot 951128015 -

getting dithering h-modes at highestr e-port power,
perhaps leading to the trips we are seeing. did some
tuning to get better match.

Nov 28 1995 12:40:08:810PM 951128016 Steve Golovato shot 951128016 -

fizzle.

Nov 28 1995 01:02:51:870PM 951128017 Steve Golovato shot 951128017 -

plasma. e-port 1mw, no trips, no h-modes.
d-port 1.3mw, crowbarred early.

Nov 28 1995 01:24:18:980PM 951128018 Steve Golovato shot 951128018 -

fizzle.

Nov 28 1995 02:04:53:280PM 951128019 Steve Golovato shot 951128019 -

plasma. d-port crowbarred again, at end of pulse, maybe after.
e-port 1.3mw.

Nov 28 1995 02:05:14:270PM 951128020 Steve Golovato shot 951128020 -

fizzle.

Nov 28 1995 02:07:32:230PM 951128021 Steve Golovato shot 951128021 -

plasma. d-port off, 1.5mw, h-mode,
short elm-free period trips rf.

Nov 28 1995 02:23:27:220PM 951128021 Steve Golovato shot 951128021 -

loading drops from 7.2 to 5.6 ohms in elm-free h-mode.

Nov 28 1995 02:22:37:230PM 951128022 Steve Golovato shot 951128022 -

plasma, 2 in a row!!!. both transmitters ran, higher density,
no h-modes. 1.5mw on e, 1.4mw on d.

Nov 28 1995 02:28:53:780PM 951128023 Steve Golovato shot 951128023 -

fizzle.

Nov 28 1995 02:49:49:750PM 951128024 Steve Golovato shot 951128024 -

plasma. transmitters overlapped in time but wouldn't
run together. d came on when e went off.

Nov 28 1995 03:05:53:260PM 951128025 Steve Golovato shot 951128025 -

plasma. still didn't run together. try turning d on first
instead of e, crosstalk is lower from d to e than e to d,
should be below trip threshold.

Nov 28 1995 03:17:58:840PM 951128026 Steve Golovato shot 951128026 -

fizzle.

Nov 28 1995 03:30:38:090PM 951128027 Steve Golovato shot 951128027 -

fizzle.

Nov 28 1995 03:49:55:720PM 951128028 Steve Golovato shot 951128028 -

fizzle.

Nov 28 1995 04:21:42:500PM 951128029 Steve Golovato shot 951128029 -

fizzle

Nov 28 1995 04:22:01:110PM 951128030 Steve Golovato shot 951128030 -

fizzle

Nov 28 1995 04:51:38:340PM 951128031 Steve Golovato shot 951128031 -

plasma. power overlapped for 60ms, 2.7mw.

Nov 28 1995 04:51:52:380PM 951128032 Steve Golovato shot 951128032 -

fizzle.

Nov 28 1995 05:04:39:390PM 951128033 Steve Golovato shot 951128033 -

plasma. attempt pep mode with d2 pellet, fired pellet at 685ms,
rf at 720ms. density decayed fast (no pep) and was almost back
down whne the rf came on. no pep, rf interrupts, h-modes later
in shot.

Nov 28 1995 05:08:22:260PM 951128034 Steve Golovato shot 951128034 -

fizzle.

Physics Operator Comments

Nov 28 1995 08:21:29:010AM John Goetz Run 951128:
A conglomeration of mini-proposals and tasks. Work to be
done on the fiducial shot - including making the equilibrium
acceptable to all groups. No TCI today, so this will not truly
be a fiducial. The mini-proposals on tap for today are MP #062
Beast Commisioning and MP #102 - RF Conditioning. These mini
proposals require constant shots for checkout, tuning, etc.

Plan:
Load 951117029
ZXL = -.015 (was -.01)
RXL = -.005 (was -.002)
NL_ZMETER feedback for density
run shots until all parties are satisfied
coldstart hybrid - all matrices respond (kick-start from TWF)
break-in NEW_PCS

Nov 28 1995 08:25:09:510AM 951128001 John Goetz Shot 951128001:
Engineering test shot for TF
Commanded zero current - got 4kAmps

For 002:
ask for more TF current

Nov 28 1995 08:46:49:720AM 951128002 John Goetz Shot 951128002:
TF crowbar @ -.065; got 150kA

For 003:
OH test pulse

Nov 28 1995 08:57:41:200AM 951128003 John Goetz Shot 951128003:
OH coax test shot - resistances look o.k.

For 004:
TF test shot and EF3 test shot

Nov 28 1995 09:09:54:850AM 951128004 John Goetz Shot 951128004:
Determined the board that was causing the TF crowbar -
o.k. now
Changes to EF3 are o.k.

For 005:
cell access to replace TCI chiller
try for plasma

Nov 28 1995 10:00:04:640AM 951128005 John Goetz Shot 951128005:
fizzle
lurch in the vertical field at the commutation time

For 006:
IC_EF4 = -1135A

Nov 28 1995 10:00:57:370AM 951128006 John Goetz Shot 951128006:
plasma - all the way down
copious CAMAC errors
got some RF power in

For 007:
try again, this time with data

Nov 28 1995 10:41:34:420AM 951128007 John Goetz Shot 951128007:
fizzle -
Br a bit too megative
vertical field coming in too quickly

For 008:
BR_0 offset = .008 (was .007)
OH2L and OH2U voltage changed to 6.5V @ .005 -> .010 sec (was 7.5V)

Nov 28 1995 10:44:12:260AM 951128008 John Goetz Shot 951128008:
plasma - all the way down
most data available
x-point drifting up a bit late in the shot

For 009:
RCUR = .667
ZXL ramping to -.02 @ 1sec
add some density @ 0.35sec

Nov 28 1995 11:02:56:500AM 951128009 John Goetz Shot 951128009:
plasma - all the way down
no temperatures or densities

For 010:
RCUR = 0.666
NL_ZMETER = 0.95 (should be a 20% increase in density)

Nov 28 1995 11:16:56:850AM 951128010 John Goetz Shot 951128010:
fizzle - breaks the two-in-a-row string

For 011:
turn down the OH2 commutation voltage to see if this
affects the lurch in Bz

Nov 28 1995 11:33:46:480AM 951128011 John Goetz Shot 951128011:
plasma - disr. @ 1.20
density disruption - ne(+1.5)=1.6e20

For 012:
OH2 commutation voltage to 900V
NL_ZMETER = 0 @ 0.95sec

Nov 28 1995 11:41:58:130AM 951128012 John Goetz Shot 951128012:
weak fizzle - no OH2 commutation
lurch in Bz is still evident -> not OH2 commutation voltage
spike

For 013:
OH2 commutation voltage back to 1100V

Nov 28 1995 12:20:34:730PM 951128013 John Goetz Shot 951128013:
fizzle - back to normal

For 014:
no changes

Nov 28 1995 12:21:27:870PM 951128014 John Goetz Shot 951128014:
plasma - disrupts @ 1.33

For 015:
V_OH1 = 180V from .005 to .015 (was 130)
turn off density @ 0.925
add some more density early in time

Nov 28 1995 12:39:28:340PM 951128015 John Goetz Shot 951128015:
plasma - all the way down
hesitation in the current rise @ .010
very messy Dalpha signal early

For 016:
hold RXL out a bit until 0.6sec
V_OH1 = 130V @ .015s

Nov 28 1995 12:54:42:170PM 951128016 John Goetz Shot 951128016:
fizzle - difficult to diagnose because of missing data

For 017:
change OH2 commutation time to +0.0005sec
V_OH1 = 130V @ .005 to .015sec

Nov 28 1995 01:21:43:360PM 951128017 John Goetz Shot 951128017:
plasma - disr. @ 1.25
killed by deuterium pellet
Dalpha behavior much better early, but still some activity

For 018:
hold ZXL out further early in time

Nov 28 1995 01:23:02:910PM 951128018 John Goetz Shot 951128018:
fizzle
possible that carbon level is too high?

For 019:
BR_0 =.0075

Nov 28 1995 01:40:47:800PM 951128019 John Goetz Shot 951128019:
plasma - disr. @ 1.22
D pellet @ 1.02sec
Dalpha behavior is improved but still some early fueling

For 020:
IC_EF4 = -1120A
move EF1 commutation time to +0.0005 sec
(the Bz bump still exists but is smaller)
RXL = +.002 early in time

Nov 28 1995 01:55:30:590PM 951128020 John Goetz Shot 951128020:
fizzle - Bz too positive for the EF1 change?
CII highest level of the day (~.03)

For 021:
IC_EF4 = -1135A

Nov 28 1995 02:06:16:770PM 951128021 John Goetz Shot 951128021:
plasma - disr. @ 1.34
D pellet @ 1.02
no hesitation in current rise, although the Bz lurch is
still there
no change in the Dalpha behavior early

For 022:
NL_ZMETER = 1.35

Nov 28 1995 02:25:19:060PM 951128022 John Goetz Shot 951128022:
plasma - surprise! - disr. @ 1.29
D pellet @ 1.02
huge moly injection @ 0.44 almost takes it out
lots o' moly early
do not make it to required density - demanding 100V

For 023:
add some gas in segment 1

Nov 28 1995 02:33:40:060PM 951128023 John Goetz Shot 951128023:
fizzle - ???

For 024:
no changes

Nov 28 1995 02:49:58:670PM 951128024 John Goetz Shot 951128024:
plasma - disr. @ 1.21
less moly early in the discharge

For 025:
more gas in segment 1

Nov 28 1995 03:10:35:900PM 951128025 John Goetz Shot 951128025:
plasma - disr. @ 1.16
less moly early in the discharge; starting to hamper the
current rise though

For 026:
more gas voltage in segment 2

Nov 28 1995 03:26:10:000PM 951128026 John Goetz Shot 951128026:
fizzle - CII stays above .02

For 027:
no changes

Nov 28 1995 03:43:35:440PM 951128027 John Goetz Shot 951128027:
fizzle - CII higher than 026
good null, but from -.003 to 0.

For 028:
add voltage spike to V_OH1 to mimic behavior caused
by TF crowbar on 951117027
V_OH1 = -200V from -.009 to -.007 and +225V from -.001 and +.003

Nov 28 1995 03:53:13:770PM 951128028 John Goetz Shot 951128028:
fizzle - breakdown @ .004
Bz not coming in fast enough - plasma current is too high

For 029:
V_OH1 = 30V from .005 to .015 (was 130V) to increase Bz rate

Nov 28 1995 04:05:35:370PM 951128029 John Goetz Shot 951128029:
fizzle - breakdown at .004
vertical field not in soon enough

For 030:
slide V_OH1 waveform 3msec earlier (from -.02 to +.005)
to try to get Bz in earlier

Nov 28 1995 04:15:44:290PM 951128030 John Goetz Shot 951128030:
fizzle - feeble breakdown @ .004
Bz doesn't come in until .010
V_OH1 tweaks affected OH2's and the null this time

For 031:
put this stuff on the back burner and reload 951128027

Nov 28 1995 04:33:36:200PM 951128031 John Goetz Shot 951128031:
plasma - disr. @ 1.16
early moly is up a bit
2.7+ MW of RF power coupled in
H-mode transition @.78s

For 032:
add 1msec to prefill puff
more gas in segment 1

Nov 28 1995 05:07:58:700PM 951128033 John Goetz Shot 951128033:
plasma - disr. @ 1.45
strange Dalpha and other visible signals are 'unique'
early - until the pellet comes in
Prf = 1.5MW - some H-mode activity

For 034:
IC_OH1 = -17100
V_OH1 = +250V from -.004 to +.001
V_OH2 = +30V from -.004 to +.001
try the 'mystery' startup again

Nov 28 1995 05:18:53:160PM 951128034 John Goetz Shot 951128034:
fizzle - b.d. @ .004
Bz nice and flat but doesn't come in until .010
Didn't get the asked for current on OH1 bus

Engineering Operator Comments

Shot Time Type Status Comment

1 08:12:33:780AM Test Ok

2 08:25:17:620AM Test Ok

3 08:47:05:640AM Test Ok

4 08:59:27:980AM Test Ok

5 09:31:21:920AM Plasma Ok

6 09:44:18:610AM Plasma Ok

7 09:59:23:810AM Plasma Ok

8 10:26:50:050AM Plasma Ok

9 10:43:18:990AM Plasma Ok

10 11:02:37:940AM Plasma Ok

11 11:20:12:160AM Plasma Ok

12 11:34:06:600AM Plasma Ok

13 11:46:02:750AM Plasma Ok

14 11:57:07:770AM Plasma Ok

15 12:11:39:220PM Plasma Ok

16 12:38:30:190PM Plasma Ok

17 12:54:16:050PM Plasma Ok

18 01:14:00:530PM Plasma Ok

19 01:23:26:370PM Plasma Ok

20 01:43:27:410PM Plasma Ok

21 01:54:30:200PM Plasma Ok

22 02:09:06:220PM Plasma Ok

23 02:25:50:720PM Plasma Ok

24 02:37:05:720PM Plasma Ok

25 02:58:06:430PM Plasma Ok

26 03:16:21:240PM Plasma Ok

27 03:29:18:500PM Plasma Ok

28 03:43:40:490PM Plasma Ok

29 03:57:14:470PM Plasma Ok

30 04:07:29:580PM Plasma Ok

31 04:19:49:690PM Plasma Ok

32 04:40:27:410PM Plasma Ok

33 04:52:28:620PM Plasma Ok

34 05:06:59:850PM Plasma Ok

35 06:02:47:970PM Test Ok

Session Leader Comments
Nov 28 1995 08:10:10:420AM		Rejean Boivin	We have 3 topics for today's run. 1) Establish a reasonable fiducial shot. 2) Finish cross-calibration of the PCX (Beast). 3) Continue RF conditioning. We will attempt to have reproducible discharges, for all 3 topics, 800 kA, density will be either 1e20 for fiducial and higher power RF, and 7e19 for PCX and low power RF.
Nov 28 1995 12:23:33:570PM		Steve Golovato	run goals - cx cal dropped, pcx lost hv ps. rf inherited run at shot 008. rf goals are: get both systems up to reliable high power (>1.5mw) establish fiducial shot conditions. get rf diagnostics working.
Nov 28 1995 12:24:32:160PM	951128001	Steve Golovato	shot 951128001 - tf test
Nov 28 1995 12:24:49:520PM	951128002	Steve Golovato	shot 951128002 - tf test, crowbar
Nov 28 1995 12:25:06:910PM	951128003	Steve Golovato	shot 951128003 - oh test, good.
Nov 28 1995 12:25:22:480PM	951128004	Steve Golovato	shot 951128004 - TF and EF3 test. Good
Nov 28 1995 09:39:34:790AM	951128005	Rejean Boivin	We have 3 topics for today's run. First plasma attempt. Fiducial at 1e20. Fizzle
Nov 28 1995 12:25:38:390PM	951128005	Steve Golovato	shot 951128005 - Plasma Attempt, fiducial. Fizzle.
Nov 28 1995 12:25:58:260PM	951128006	Steve Golovato	shot 951128006 - Good plasma.
Nov 28 1995 12:26:06:280PM	951128006	Steve Golovato	shot 951128006 - Good plasma.
Nov 28 1995 12:26:08:050PM	951128006	Steve Golovato	shot 951128006 - Good plasma.
Nov 28 1995 12:26:09:330PM	951128006	Steve Golovato	shot 951128006 - Good plasma.
Nov 28 1995 12:26:50:370PM	951128006	Steve Golovato	shot 951128006 - Good plasma. e-port tuning looks better, should be able to tune to match.
Nov 28 1995 12:27:04:890PM	951128007	Steve Golovato	shot 951128007 - Fizzle
Nov 28 1995 10:39:10:900AM	951128008	Rejean Boivin	We have 3 topics for today's run. Good plasma. PCX (beast) HV power supply not responding. Revert run to Fiducial development and RF conditioning.
Nov 28 1995 12:29:10:910PM	951128008	Steve Golovato	shot 951128008 - Good plasma, Have problem with PCX HV power supply. Will revert to Fiducial development and RF conditioning. e-port better, d-port at 1.25mw.
Nov 28 1995 12:29:47:090PM	951128009	Steve Golovato	shot 951128009 - Good plasma, e-port 0.4mw
Nov 28 1995 12:30:04:890PM	951128010	Steve Golovato	shot 951128010 - fizzle
Nov 28 1995 12:30:39:110PM	951128011	Steve Golovato	shot 951128011 - plasma, e-port 0.8mw, d-port transmitter tripping at 1.3mw
Nov 28 1995 12:30:55:030PM	951128012	Steve Golovato	shot 951128012 - fizzle
Nov 28 1995 12:31:06:650PM	951128013	Steve Golovato	shot 951128013 - fizzle
Nov 28 1995 12:34:54:170PM	951128014	Steve Golovato	shot 951128014 - plasma. d-port tripped at turnoff, at 1mw. e-port 1.3mw with some trips. loading, voltages the same on the two antennas now that they have the same coax circuits, e is now like d with higher loading, lower voltages.
Nov 28 1995 12:36:15:590PM	951128015	Steve Golovato	shot 951128015 - plasma. d-port at 1mw, no trips. e-port 1.2mw with trips at highest power.
Nov 28 1995 12:48:59:100PM	951128015	Steve Golovato	shot 951128015 - getting dithering h-modes at highestr e-port power, perhaps leading to the trips we are seeing. did some tuning to get better match.
Nov 28 1995 12:40:08:810PM	951128016	Steve Golovato	shot 951128016 - fizzle.
Nov 28 1995 01:02:51:870PM	951128017	Steve Golovato	shot 951128017 - plasma. e-port 1mw, no trips, no h-modes. d-port 1.3mw, crowbarred early.
Nov 28 1995 01:24:18:980PM	951128018	Steve Golovato	shot 951128018 - fizzle.
Nov 28 1995 02:04:53:280PM	951128019	Steve Golovato	shot 951128019 - plasma. d-port crowbarred again, at end of pulse, maybe after. e-port 1.3mw.
Nov 28 1995 02:05:14:270PM	951128020	Steve Golovato	shot 951128020 - fizzle.
Nov 28 1995 02:07:32:230PM	951128021	Steve Golovato	shot 951128021 - plasma. d-port off, 1.5mw, h-mode, short elm-free period trips rf.
Nov 28 1995 02:23:27:220PM	951128021	Steve Golovato	shot 951128021 - loading drops from 7.2 to 5.6 ohms in elm-free h-mode.
Nov 28 1995 02:22:37:230PM	951128022	Steve Golovato	shot 951128022 - plasma, 2 in a row!!!. both transmitters ran, higher density, no h-modes. 1.5mw on e, 1.4mw on d.
Nov 28 1995 02:28:53:780PM	951128023	Steve Golovato	shot 951128023 - fizzle.
Nov 28 1995 02:49:49:750PM	951128024	Steve Golovato	shot 951128024 - plasma. transmitters overlapped in time but wouldn't run together. d came on when e went off.
Nov 28 1995 03:05:53:260PM	951128025	Steve Golovato	shot 951128025 - plasma. still didn't run together. try turning d on first instead of e, crosstalk is lower from d to e than e to d, should be below trip threshold.
Nov 28 1995 03:17:58:840PM	951128026	Steve Golovato	shot 951128026 - fizzle.
Nov 28 1995 03:30:38:090PM	951128027	Steve Golovato	shot 951128027 - fizzle.
Nov 28 1995 03:49:55:720PM	951128028	Steve Golovato	shot 951128028 - fizzle.
Nov 28 1995 04:21:42:500PM	951128029	Steve Golovato	shot 951128029 - fizzle
Nov 28 1995 04:22:01:110PM	951128030	Steve Golovato	shot 951128030 - fizzle
Nov 28 1995 04:51:38:340PM	951128031	Steve Golovato	shot 951128031 - plasma. power overlapped for 60ms, 2.7mw.
Nov 28 1995 04:51:52:380PM	951128032	Steve Golovato	shot 951128032 - fizzle.
Nov 28 1995 05:04:39:390PM	951128033	Steve Golovato	shot 951128033 - plasma. attempt pep mode with d2 pellet, fired pellet at 685ms, rf at 720ms. density decayed fast (no pep) and was almost back down whne the rf came on. no pep, rf interrupts, h-modes later in shot.
Nov 28 1995 05:08:22:260PM	951128034	Steve Golovato	shot 951128034 - fizzle.

Physics Operator Comments
Nov 28 1995 08:21:29:010AM		John Goetz	Run 951128: A conglomeration of mini-proposals and tasks. Work to be done on the fiducial shot - including making the equilibrium acceptable to all groups. No TCI today, so this will not truly be a fiducial. The mini-proposals on tap for today are MP #062 Beast Commisioning and MP #102 - RF Conditioning. These mini proposals require constant shots for checkout, tuning, etc. Plan: Load 951117029 ZXL = -.015 (was -.01) RXL = -.005 (was -.002) NL_ZMETER feedback for density run shots until all parties are satisfied coldstart hybrid - all matrices respond (kick-start from TWF) break-in NEW_PCS
Nov 28 1995 08:25:09:510AM	951128001	John Goetz	Shot 951128001: Engineering test shot for TF Commanded zero current - got 4kAmps For 002: ask for more TF current
Nov 28 1995 08:46:49:720AM	951128002	John Goetz	Shot 951128002: TF crowbar @ -.065; got 150kA For 003: OH test pulse
Nov 28 1995 08:57:41:200AM	951128003	John Goetz	Shot 951128003: OH coax test shot - resistances look o.k. For 004: TF test shot and EF3 test shot
Nov 28 1995 09:09:54:850AM	951128004	John Goetz	Shot 951128004: Determined the board that was causing the TF crowbar - o.k. now Changes to EF3 are o.k. For 005: cell access to replace TCI chiller try for plasma
Nov 28 1995 10:00:04:640AM	951128005	John Goetz	Shot 951128005: fizzle lurch in the vertical field at the commutation time For 006: IC_EF4 = -1135A
Nov 28 1995 10:00:57:370AM	951128006	John Goetz	Shot 951128006: plasma - all the way down copious CAMAC errors got some RF power in For 007: try again, this time with data
Nov 28 1995 10:41:34:420AM	951128007	John Goetz	Shot 951128007: fizzle - Br a bit too megative vertical field coming in too quickly For 008: BR_0 offset = .008 (was .007) OH2L and OH2U voltage changed to 6.5V @ .005 -> .010 sec (was 7.5V)
Nov 28 1995 10:44:12:260AM	951128008	John Goetz	Shot 951128008: plasma - all the way down most data available x-point drifting up a bit late in the shot For 009: RCUR = .667 ZXL ramping to -.02 @ 1sec add some density @ 0.35sec
Nov 28 1995 11:02:56:500AM	951128009	John Goetz	Shot 951128009: plasma - all the way down no temperatures or densities For 010: RCUR = 0.666 NL_ZMETER = 0.95 (should be a 20% increase in density)
Nov 28 1995 11:16:56:850AM	951128010	John Goetz	Shot 951128010: fizzle - breaks the two-in-a-row string For 011: turn down the OH2 commutation voltage to see if this affects the lurch in Bz
Nov 28 1995 11:33:46:480AM	951128011	John Goetz	Shot 951128011: plasma - disr. @ 1.20 density disruption - ne(+1.5)=1.6e20 For 012: OH2 commutation voltage to 900V NL_ZMETER = 0 @ 0.95sec
Nov 28 1995 11:41:58:130AM	951128012	John Goetz	Shot 951128012: weak fizzle - no OH2 commutation lurch in Bz is still evident -> not OH2 commutation voltage spike For 013: OH2 commutation voltage back to 1100V
Nov 28 1995 12:20:34:730PM	951128013	John Goetz	Shot 951128013: fizzle - back to normal For 014: no changes
Nov 28 1995 12:21:27:870PM	951128014	John Goetz	Shot 951128014: plasma - disrupts @ 1.33 For 015: V_OH1 = 180V from .005 to .015 (was 130) turn off density @ 0.925 add some more density early in time
Nov 28 1995 12:39:28:340PM	951128015	John Goetz	Shot 951128015: plasma - all the way down hesitation in the current rise @ .010 very messy Dalpha signal early For 016: hold RXL out a bit until 0.6sec V_OH1 = 130V @ .015s
Nov 28 1995 12:54:42:170PM	951128016	John Goetz	Shot 951128016: fizzle - difficult to diagnose because of missing data For 017: change OH2 commutation time to +0.0005sec V_OH1 = 130V @ .005 to .015sec
Nov 28 1995 01:21:43:360PM	951128017	John Goetz	Shot 951128017: plasma - disr. @ 1.25 killed by deuterium pellet Dalpha behavior much better early, but still some activity For 018: hold ZXL out further early in time
Nov 28 1995 01:23:02:910PM	951128018	John Goetz	Shot 951128018: fizzle possible that carbon level is too high? For 019: BR_0 =.0075
Nov 28 1995 01:40:47:800PM	951128019	John Goetz	Shot 951128019: plasma - disr. @ 1.22 D pellet @ 1.02sec Dalpha behavior is improved but still some early fueling For 020: IC_EF4 = -1120A move EF1 commutation time to +0.0005 sec (the Bz bump still exists but is smaller) RXL = +.002 early in time
Nov 28 1995 01:55:30:590PM	951128020	John Goetz	Shot 951128020: fizzle - Bz too positive for the EF1 change? CII highest level of the day (~.03) For 021: IC_EF4 = -1135A
Nov 28 1995 02:06:16:770PM	951128021	John Goetz	Shot 951128021: plasma - disr. @ 1.34 D pellet @ 1.02 no hesitation in current rise, although the Bz lurch is still there no change in the Dalpha behavior early For 022: NL_ZMETER = 1.35
Nov 28 1995 02:25:19:060PM	951128022	John Goetz	Shot 951128022: plasma - surprise! - disr. @ 1.29 D pellet @ 1.02 huge moly injection @ 0.44 almost takes it out lots o' moly early do not make it to required density - demanding 100V For 023: add some gas in segment 1
Nov 28 1995 02:33:40:060PM	951128023	John Goetz	Shot 951128023: fizzle - ??? For 024: no changes
Nov 28 1995 02:49:58:670PM	951128024	John Goetz	Shot 951128024: plasma - disr. @ 1.21 less moly early in the discharge For 025: more gas in segment 1
Nov 28 1995 03:10:35:900PM	951128025	John Goetz	Shot 951128025: plasma - disr. @ 1.16 less moly early in the discharge; starting to hamper the current rise though For 026: more gas voltage in segment 2
Nov 28 1995 03:26:10:000PM	951128026	John Goetz	Shot 951128026: fizzle - CII stays above .02 For 027: no changes
Nov 28 1995 03:43:35:440PM	951128027	John Goetz	Shot 951128027: fizzle - CII higher than 026 good null, but from -.003 to 0. For 028: add voltage spike to V_OH1 to mimic behavior caused by TF crowbar on 951117027 V_OH1 = -200V from -.009 to -.007 and +225V from -.001 and +.003
Nov 28 1995 03:53:13:770PM	951128028	John Goetz	Shot 951128028: fizzle - breakdown @ .004 Bz not coming in fast enough - plasma current is too high For 029: V_OH1 = 30V from .005 to .015 (was 130V) to increase Bz rate
Nov 28 1995 04:05:35:370PM	951128029	John Goetz	Shot 951128029: fizzle - breakdown at .004 vertical field not in soon enough For 030: slide V_OH1 waveform 3msec earlier (from -.02 to +.005) to try to get Bz in earlier
Nov 28 1995 04:15:44:290PM	951128030	John Goetz	Shot 951128030: fizzle - feeble breakdown @ .004 Bz doesn't come in until .010 V_OH1 tweaks affected OH2's and the null this time For 031: put this stuff on the back burner and reload 951128027
Nov 28 1995 04:33:36:200PM	951128031	John Goetz	Shot 951128031: plasma - disr. @ 1.16 early moly is up a bit 2.7+ MW of RF power coupled in H-mode transition @.78s For 032: add 1msec to prefill puff more gas in segment 1
Nov 28 1995 05:07:58:700PM	951128033	John Goetz	Shot 951128033: plasma - disr. @ 1.45 strange Dalpha and other visible signals are 'unique' early - until the pellet comes in Prf = 1.5MW - some H-mode activity For 034: IC_OH1 = -17100 V_OH1 = +250V from -.004 to +.001 V_OH2 = +30V from -.004 to +.001 try the 'mystery' startup again
Nov 28 1995 05:18:53:160PM	951128034	John Goetz	Shot 951128034: fizzle - b.d. @ .004 Bz nice and flat but doesn't come in until .010 Didn't get the asked for current on OH1 bus

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:12:33:780AM	Test	Ok
2	08:25:17:620AM	Test	Ok
3	08:47:05:640AM	Test	Ok
4	08:59:27:980AM	Test	Ok
5	09:31:21:920AM	Plasma	Ok
6	09:44:18:610AM	Plasma	Ok
7	09:59:23:810AM	Plasma	Ok
8	10:26:50:050AM	Plasma	Ok
9	10:43:18:990AM	Plasma	Ok
10	11:02:37:940AM	Plasma	Ok
11	11:20:12:160AM	Plasma	Ok
12	11:34:06:600AM	Plasma	Ok
13	11:46:02:750AM	Plasma	Ok
14	11:57:07:770AM	Plasma	Ok
15	12:11:39:220PM	Plasma	Ok
16	12:38:30:190PM	Plasma	Ok
17	12:54:16:050PM	Plasma	Ok
18	01:14:00:530PM	Plasma	Ok
19	01:23:26:370PM	Plasma	Ok
20	01:43:27:410PM	Plasma	Ok
21	01:54:30:200PM	Plasma	Ok
22	02:09:06:220PM	Plasma	Ok
23	02:25:50:720PM	Plasma	Ok
24	02:37:05:720PM	Plasma	Ok
25	02:58:06:430PM	Plasma	Ok
26	03:16:21:240PM	Plasma	Ok
27	03:29:18:500PM	Plasma	Ok
28	03:43:40:490PM	Plasma	Ok
29	03:57:14:470PM	Plasma	Ok
30	04:07:29:580PM	Plasma	Ok
31	04:19:49:690PM	Plasma	Ok
32	04:40:27:410PM	Plasma	Ok
33	04:52:28:620PM	Plasma	Ok
34	05:06:59:850PM	Plasma	Ok
35	06:02:47:970PM	Test	Ok