Alcator C-Mod Run 940610 Information

Miniproposals

Miniproposal: 055

Date Filed: 5/13/1994

Title: Study of Core Particle Transport

First Author: Tom Luke

Session Leader: Tom Luke (shots 1-29)

Operators
Session leader(s):	Tom Luke
Physics operator(s):	John Goetz
Engineering operator(s):	Vinny Bertolino,David Gwinn

Engineering Operator Run Comment
transport/goetz/?

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:11:023PM

Author: To Be Determined

From: NEL::LUKE
Date: 12-JUN-1994 10:42:39
Description: Run summary for 061094

Run of 940610
Physics Operator - John Goetz (aka Juan Gotez)
Session Leader - T.Luke
Engineering - V. Bartolino

This run is based on Mini Proposal 55: The Study of Core Partcle Transport
The goal was to use modulated gas puffing perturbations to determine the
diffusion coefficients of particle transport. The plan was to scan in current
and density and get a baseline set of coefficients for ohmic, diverted
operation.

During the run, we ended up only looking at one current, 600 kA. We were
able to do two densities at that current, namely low density at a nl of about
5.0 E19 and high density at 8.0E19. We were able to operate diverted and had
several good shots with multiple puffs at each of these densities.
It also looks like depending on the density when we diverted, we may have
been detached also. This will be investigated in detail.

Diverted operation was better that on 061009; we were able to get several
shots in a row with similiar conditions. However, there still remains a
vertical oscillation problem and it seems random whether you survive and keep
the shot going. Progress was definitely made in terms of density control and
we were able to flatten out the background density during the current
flattop.

In summary, this was a very useful day for transport studies. The miniproposal
is clearly more than half completed and we may be able to make the required
comparison of detached and attached plasmas.

The best shots were:

Low Density: 14,15,16,17,18
High Density:23,24,25,28

The shot by shot summary follows:

Shot 1: Set up repeat of shot 940609011. Dud

Shot 2: Early disruption

Shot 3: Good shot. nebar =1.2e20 , flat density and current after 700 ms

shot 4: two puffs at 650 and 750. First seems lost in the diverting of the
plasm. Puff 2 looks good but the background n is rising.

Shot 5: 3 puffs, rising background

Shot 6: Same as 5

Shot 7: background is flattening.

shot 8: Too much compensation, background is decreasing. Still 3 puffs.

Shot 9: Beautiful shot with 3 puffs. Flat background.

shot 10: early disruption

Shot 11: fizzle

Shot 12 and 13: same as 10

Shot 14: Nice shot, 3 Puffs, background is lower at nl of 5.0e19 at diversion.

Shot 15: Good shot

Shot 16: Added extra puff at 1.0. Nice

Shot 17: Lower Background density. Still going nicely with 4 puffs

Shot 18: Dies early. Makes it past diversion and can see the first puff but
then disrupts.

Shot 19-22: Early disruption

Shot 23: Higher Background. May be detached when diversion occurs. nl=6.0 e19
4 puffs.

Shot 24: Nice shot. Possibly see the plasma detaching at 700 ms.

Shot 25: Nice high density shot. 4 puffs.

Shot 26: Disrupts early

Shot 27: fizzle

Shot 28: Nice shot. Again might see the detached transition at the first
puff. nl before diversion is 5.5e19

Shot 29: early disruption

That's all Folks.

TCL

Physics Operator Summaries

Entered: Jul 7 2004 04:36:51:723PM

Author: To Be Determined

Physics operator summary for 940610

EO: Gwinn/Bertilino
PO: Goetz
SL: Luke

Run 940610 was in support of Mini-Proposal #055 - Study of Core Particle
Transport. This run was intended to use gas puffing as a means of determining
transport coefficients (D's and v's). Some data was obtained for this cause
(see the run_summary_940610).

Troubles today were with the vertical position control. In order to remove
the upper x-point from the vacuum vessel, the EF2U was programmed with a
big change ( see phys_op_summary_940609). This change causes a glitch in
the vertical position. This glitch is survivable if it remains less than
4-5 cm. To get around this glitch, the turn-on of RXL control was delayed
and the vertical position ramp was made more gentle. These changes appeared
to work and together with extended pulse lengths, adequate discharges for
data collection were obtained. The problem with this delay of the RXL turn-on
is that the lower x-point forms inside the inner nose of the divertor and
the discharge is limited on the nose for a long time.

ZXL control was exhibited, but with a long equilibration time and what
appears to be an offset of ~2cm from the nominal position.

Work still needs to be done on these 'divertor' controllers as most of
the shaping has been done 'manually' with the IC_* controllers for a
plasma current of 0.6MA.

Engineering today: Computer troubles today (SHAPE was disconnected from the
net accidently) lost some time waiting for the reboot.

Scorecard: 29 shots = 26 plasmas + 2 fizzles + 1 dud

Shot summary for Run 940610

Reload of 940609011

Changes:
more PULSE_GAS_3 after 0.4 to increase density
turn on CLEARIN from 0.42 to 0.50sec @ -.005

Shot change result
____ _____ ______
1 see above dud
2 IC_EF4 = -1040A; P_0=1.1e-5 plasma
3 IC_EF2U ramp gets to -3000A @ 0.55sec; ZCUR ramp to -.015
@ 0.5sec plasma
4 add 43V x 0.02sec pulses on PULSE_GAS_3 at 0.65 and 0.75
IC_EF1L to +450 at 0.5 and -100 @ 0.6 plasma
5 remove 5V from each of the PULSE_GAS_3 puffs; add 38Vx0.01sec
pulse @ 0.85 to PULSE_GAS_3 plasma
6 Extend Ip flat-top to 1.1sec; reduce first puff width to .015;
reduce 2nd and 3rd puffs by 5V; EF2U ramp to -3000@0.6;
ZCUR ramp from 0.36 to 0.46 plasma
7 ramp down PULSE_GAS_3 during flat-top; all puffs now .01s wide plasma
8 puffs on PULSE_GAS_3 now at 0.7, 0.8, and 0.9 sec; ramp
on PULSE_GAS_3 steeper; ZCUR ramp from 0.32 to 0.42sec plasma
9 ZXL ramp from -.005 @ 0.5sec to -.01 @ 1.1; make PULSE_GAS_3
ramp less severe; turn CLEARIN gain on a little earlier plasma
10 ZXL drawn to -.01 @ .75sec; IC_EF2L to -900A @ 0.4 (was -1150) plasma
11 reload 940610009 fizzle
12 IC_EF4 to -1035A plasma
13 lower PULSE_GAS_3 between 0.1 and 0.3 plasma
14 stairstep on the RXL gain beginning at 0.6; ZCUR ramp from
0.58 to 0.65sec plasma
15 lower PULSE_GAS_3 after each puff; raise PULSE_GAS_3 early;
ZXL to -.01 @ 0.8 plasma
16 extend pulse length to 1.2sec; PF inversion times = 1.5sec;
extend EF1's and EF2's to 1.35sec; add 4th pulse to
PULSE_GAS_3 @ 1.sec; move 3rd pulse on PULSE_GAS_1 to
.620sec plasma
17 extend RCUR, ZCUR, ZXL, RXL, and CLEARIN to 1.2sec; delicate
tweaks to PULSE_GAS_3 plasma
18 turn on RXL starting @ .56; TF invert to 1.3sec; more volts
to 4th pulse on PULSE_GAS_3 plasma
19 RXL turning on at .58 plasma
20 Reload 017; add gas early to PULSE_GAS_3 plasma
21 voltage programming on EF2L to 0. @ .45sec; overlap gain turn
off for IC_EF2L with turn on of RXL; up volts early
on PULSE_GAS_3 plasma
22 slow down ramp in ZCUR plasma
23 RXL on @ 0.5; ZCUR ramp much slower; IC_EF2L more negative
for longer plasma
24 more volts on PULSE_GAS_3 to up density plasma
25 add 5th gas puff of 40V x .01sec @ 1.1sec; lower 1st pulse
to 12V plasma
26 RXL=+.005 from 0.6 to 1.2; ZXL=-.015 from .72 to 1.2 plasma
27 reload 940610025 fizzle
28 P_0=1.2e-5 plasma
29 lower PULSE_GAS_3 early; first puff to .725; second puff
gone; third puff is now .03sec wide @ .85 plasma

Session Leader Comments

Jun 10 1994 08:11:03:770AM Tom Luke Today's run will be devoted to the study of core particle transport
through gas modulation experiments. We will be trying to run diverted
in order that we can better compare measured baseline coefficients with
those of detached plasmas. There will be an attempt at scanning in
density and plasma current with several shots at each pair of parameters.
A few limited shots at the same plasma parameters will be done to
compare transport during diverted and limited operation.

Jun 10 1994 08:14:00:090AM Tom Luke Today's run will be devoted to the study of core particle transport
through gas modulation experiments. We will be trying to run diverted
in order that we can better compare measured baseline coefficients with
those of detached plasmas. There will be an attempt at scanning in
density and plasma current with several shots at each pair of parameters.
A few limited shots at the same plasma parameters will be done to
compare transport during diverted and limited operation.

Jun 10 1994 08:43:58:990AM 940610001 Tom Luke Repeat shot 940609011. No puffs. Establishing density flattop.
Result:Dud. No data in channel 8 in TCI.

Jun 10 1994 08:57:03:140AM 940610002 Tom Luke Shot went. Short and disrupted at .5 s. Density looks pretty good and
was flattening out.

Jun 10 1994 09:20:44:740AM 940610002 Tom Luke Shot lasted to 1.16 s. Nice shot. Disrupted on the way down.
Try some puffs next time. Lost channel 4 due to camac error.

Jun 10 1994 09:21:46:500AM 940610003 Tom Luke Shot lasted to 1.16 s. Nice shot. Disrupted on the way down.
Try some puffs next time. Lost channel 4 due to camac error.

Jun 10 1994 09:37:26:510AM 940610004 Tom Luke Put 2 puffs at 650 and 750 ms. 43 V for 20 ms. Puffs appear as steps
as opposed to oscillations. Lower puffs by 5 V for next shot and
add one at 850 ms.

Jun 10 1994 09:56:24:100AM 940610005 Tom Luke Put 3 puffs at 650,750 and 850 ms. 38 V for 20 ms for first two and only 10
ms for the third. Puffs are still a little big and we are trying to
adjust them.

Jun 10 1994 10:12:14:860AM 940610006 Tom Luke Put 3 puffs at 650,750 and 850 ms. 38 V for 15 ms for first and 33V
for the second and third. Puffs still too big. Reduce them all to 10 ms

Jun 10 1994 10:27:47:660AM 940610007 Tom Luke Put 3 puffs at 650,750 and 850 ms. 38 V for 15 ms for first and 33V
for the second and third. Background denisity is still rising.
Puffs look ok, first one is sometimes swamped by diversion.

Jun 10 1994 10:52:39:960AM 940610008 Tom Luke Sloped the background density too much. It is now decreasing.

Jun 10 1994 11:34:47:130AM 940610009 Tom Luke Puffs are less noticeable even though denisty has flattened out.
Try again

Jun 10 1994 11:33:21:110AM 940610010 Tom Luke Lost shot at .55s due to vertical instability.

Jun 10 1994 12:11:24:710PM 940610011 Tom Luke fizzle

Jun 10 1994 12:11:47:970PM 940610012 Tom Luke Same as 10.

Jun 10 1994 12:33:09:380PM 940610013 Tom Luke Same as 10.

Jun 10 1994 12:38:50:330PM 940610014 Tom Luke Good shot. Puffs are steps again. Let's go back and play with the density
again.

Jun 10 1994 01:43:47:600PM 940610016 Tom Luke Good, 4 puffs. First puff may still be a little big. 4.0e19 baseline nl.

Jun 10 1994 02:05:23:400PM 940610016 Tom Luke Good, 4 puffs. Baseline nl of 4.6e19.

Jun 10 1994 02:23:36:830PM 940610017 Tom Luke good shot., 3 good puffs.

Jun 10 1994 02:24:15:420PM 940610018 Tom Luke died at 800 ms.

Jun 10 1994 02:25:32:190PM 940610019 Tom Luke density lower. Not enough gas??? Reload 17 and up the gas in general and
the last puff.

Jun 10 1994 02:45:24:780PM 940610020 Tom Luke died at 642 ms. ????

Jun 10 1994 04:23:23:240PM 940610024 Tom Luke Nice flattop,
2 good puffs

Jun 10 1994 04:24:02:020PM 940610025 Tom Luke Added fifth puff at 1.1s. Nice

Jun 10 1994 04:29:54:810PM 940610026 Tom Luke Moved x-point location. Died early. Try again

Jun 10 1994 04:42:59:660PM 940610026 Tom Luke Moved x-point location. Died early. Try again

Jun 10 1994 04:43:25:470PM 940610027 Tom Luke fizzle for 50 ms. Try again

Jun 10 1994 05:22:35:400PM 940610028 Tom Luke good shot. Nice clean puffs although background density isn't as flat.

Jun 10 1994 05:22:57:030PM 940610028 Tom Luke Died. Same vertical problem as before

Physics Operator Comments

Jun 10 1994 08:32:50:800AM John Goetz RUN 940610
Mini-Proposal # 55 - Study of Core Particle Transport

Start from shot 940609011 - a somewhat nice single null discharge
of .60 MA and 1.0 sec duration

Changes: more PULSE_GAS_3 after 0.4 to increase the density
turn on the CLEARIN from 0.42 to 0.5sec at a value of
-.005 to grow the inner gap earlier

Jun 10 1994 08:45:31:290AM 940610001 John Goetz Shot 940610001:
DUD
null looks o.k. - Bz crosses zero a little late
is it the fact that there was no RF assist?

For Shot 940610002:
IC_EF4 = -1040A ( was -1030A )
P_0 = 1.1e-5

Jun 10 1994 09:00:02:060AM 940610002 John Goetz Shot 940610002:
plasma - disruption @ 0.542
null looked better than shot 1
lost this plasma down on a ZCUR oscillation

For Shot 940610003:
Change IC_EF2U ramp to get to -3000A @ 0.55sec
Change ZCUR ramp to get to -.015 @ 0.5sec

Jun 10 1994 09:23:11:930AM 940610003 John Goetz Shot 940610003:
plasma - disruption on ramp down @ 1.15
ZCUR oscillation of -.04 @ .545

For Shot 940610004:
IC_EF1L to +450 @ 0.5 & -100 @ 0.6 to mimic IC_EF1U and control
vertical oscillation
put 43V x 0.02sec pulses on PULSE_GAS_3 @ 0.65 & 0.75sec

Jun 10 1994 09:37:52:260AM 940610004 John Goetz Shot 940610004:
plasma - disruption on ramp down @ 1.15
ZCUR oscillation is still there

For Shot 940610005:
remove 5V from each PULSE_GAS_3 puff
add 38V x 0.01sec pulse @ 0.85sec to PULSE_GAS_3

Jun 10 1994 09:59:42:030AM 940610005 John Goetz Shot 940610005:
plasma - disruption on ramp down @ 1.2
ZCUR oscillation is still there

For Shot 940610006:
extend Ip flattop to 1.1sec
reduce first PULSE_GAS_3 width to .015; reduce 2nd and 3rd
by 5V
EF2U ramp to -3000A @ 0.6
ZCUR ramp from 0.36 to 0.46sec

Jun 10 1994 10:14:04:720AM 940610006 John Goetz Shot 940610006:
plasma - disruption on ramp down @ 1.2
flat-top holds until 1.1
ZCUR oscillation still there

For Shot 940610007:
ramp down PULSE_GAS_3 during flat-top
all puffs now .01sec wide

Jun 10 1994 10:34:21:840AM 940610007 John Goetz Shot 940610007:
plasma - all the way to PF inversion
ZCUR oscillation still there

For Shot 940610008:
ramp down PULSE_GAS_3 more steeply during flat-top
puffs are now at 0.7, 0.8, 0.9sec
ZCUR ramp now from 0.32 to 0.42sec

Jun 10 1994 11:04:31:740AM 940610008 John Goetz Shot 940610008:
plasma - all the way to PF inversion
density is drooping
ZCUR oscillation still there

For Shot 940610009:
make PULSE_GAS_3 less severe during flat-top
ZXL ramp from -.005 @ 0.5 to -.01 @ 1.1
turn on CLEARIN gain a little earlier

Jun 10 1994 11:11:48:320AM 940610009 John Goetz Shot 940610009:
plasma - disruption at 1.12
ZCUR oscillation still there
liberate a lot of deuterium from 0.3sec until divertor forms

For Shot 940610010:
try again - no changes

Jun 10 1994 11:34:57:800AM 940610010 John Goetz Shot 940610010:
plasma - disruption at .617 - goes up
in trouble starting at .555 - current dropping
ZCUR oscillation still there

For Shot 940610011:
punt - reload 940610009

Jun 10 1994 12:04:41:110PM 940610011 John Goetz Shot 940610011:
fizzle
hit something @ .02 and at .025
Bz a bit too negative

For Shot 940610012:
IC_EF4U to -1035A

Jun 10 1994 12:05:44:130PM 940610012 John Goetz Shot 940610012:
Plasma - disruption @ .617
trouble starts @ .55
density rising too quickly
very similar to shot 010

For Shot 940610013:
lower PULSE_GAS_3 between 0.1 and 0.3

Jun 10 1994 12:19:46:500PM 940610013 John Goetz Shot 940610013:
Plasma - disruption @ .625 - first disruption at .586
influx of crap @ 0.51

For Shot 940610014:
delay start of ZCUR ramp until 0.58sec
stairstep on the RXL gain beginning at 0.6
hopefull both of these changes will let the plasma survive the
ZCUR bounce

Jun 10 1994 12:40:43:140PM 940610014 John Goetz Shot 940610014:
Plasma - disruption @ 1.13
plasma jumps out at .975sec
ZCUR oscillation now only -0.5cm

For Shot 940610015:
lower PULSE_GAS_3 after each puff to try and hold density
constant
raise PULSE_GAS_3 early to raise background density level
ZXL to -.01 @ 0.8 to flatten time history of EFIT-ZXL

Jun 10 1994 01:24:44:810PM 940610014 John Goetz Shot 940610014:
the jump out in position was due to EF3 crapping out at
0.957 - no reason given by engineering

Jun 10 1994 01:04:27:470PM 940610015 John Goetz Shot 940610015:
Plasma - almost all the way down

For Shot 940610016:
extend pulse length to 1.2 sec
add 4th pulse to PULSE_GAS_3 @ 1.0sec
PF inversion times = 1.5 sec
extend EF1's and EF2's to 1.3 sec

Jun 10 1994 01:25:12:950PM 940610016 John Goetz Shot 940610016:
SHAPE needed to be rebooted before this shot

Jun 10 1994 01:44:52:690PM 940610016 John Goetz Shot 940610016:
plasma - disruption at 1.32 on the way down
nice divertor after about 0.65sec

For Shot 940610017:
extend RCUR, ZCUR, ZXL, RXL, and CLEARIN to 1.2sec
delicate tweaks to PULSE_GAS_3

Jun 10 1994 02:04:14:620PM 940610017 John Goetz Shot 940610017:
plasma - disruption at 1.242 on the way down
current rolls over early

For Shot 940610018:
turn on RXL starting @ 0.56
extend EF2L to 1.2sec
TF invert to 1.3sec
more volts to 4th puff on PULSE_GAS_3

Jun 10 1994 02:20:01:250PM 940610018 John Goetz Shot 940610018:
plasma - disruption at 0.8
can't explain it
ZCUR oscillation is back

For Shot 940610019:
RXL turning on @ 0.58

Jun 10 1994 02:30:52:160PM 940610019 John Goetz Shot 940610019:
plasma - disruption at 0.65
loss of z-position
no ZCUR oscillation, though

For Shot 940610020:
reload 940610017
up the magnitude of the 4th puff on PULSE_GAS_3
more volts early on PULSE_GAS_3

Jun 10 1994 02:48:02:060PM 940610020 John Goetz Shot 940610020:
plasma - disruption at 0.642
loss of z-position

For Shot 940610021:
raise the density with more volts on PULSE_GAS_3 early
voltage programming on EF2L to 0. @ .45sec
overlap gain turn off for IC_EF2L with the gain turn on of RXL
the last few shots have not had any feedback on the
EF2L

Jun 10 1994 03:00:00:690PM 940610021 John Goetz Shot 940610021:
plasma - disruption at 0.7
quick loss of z-position
kappa = 1.4

For Shot 940610022:
slow down the ZCUR ramp and hope to retain vertical position
control

Jun 10 1994 03:16:54:030PM 940610022 John Goetz Shot 940610022:
plasma - disruption at 0.682
quick loss of z-position

For Shot 940610023:
RXL on at 0.5 to try and get x-point into machine
ZCUR ramp much slower
IC_EF2L more negative for longer

Jun 10 1994 03:33:15:660PM 940610023 John Goetz Shot 940610023:
plasma - almost all the way down
ZCUR oscillation back - only 2 cm though

For Shot 940610024:
more volts on PULSE_GAS_3 to up density

Jun 10 1994 03:53:34:000PM 940610024 John Goetz Shot 940610024:
plasma - disruption @ 1.23

For Shot 940610025:
add 5th puff to PULSE_GAS_3 @ 1.1 ( 40V x .01sec )
lower 1st puff to PULSE_GAS_3 to 12V

Jun 10 1994 04:07:55:870PM 940610025 John Goetz Shot 940610025:
plasma - disruption @ 1.24

For Shot 940610026:
RXL = +.005 from 0.6 to 1.2
ZXL = -.015 from 0.72 to 1.2

Jun 10 1994 04:32:02:180PM 940610026 John Goetz Shot 940610026:
plasma - disruption @ .725
lost vertical position ( due to change in drawn RXL? )

For Shot 940610027:
reload shot 940610025

Jun 10 1994 04:44:26:370PM 940610027 John Goetz Shot 940610027:
fizzle - lasted until .06 - hit something at .039

For Shot 940610028:
P_0=1.2e-5

Jun 10 1994 05:00:51:730PM 940610028 John Goetz Shot 940610028:
plasma - disruption @ 1.31

For Shot 940610029:
first puff on PULSE_GAS_3 moved to .725
second puff eliminated
third puff is now @ .85 and is .03

Jun 10 1994 05:10:58:210PM 940610029 John Goetz Shot 940610029:
plasma - disruption @ 0.708
loss of vertical control

Engineering Operator Comments

Shot Time Type Status Comment

1 08:34:02:680AM Plasma Ok p.s's ok no breakdown

2 08:46:17:590AM Plasma Ok 600 ka, oh2 com fault

3 09:00:43:260AM Plasma Ok good

4 09:20:29:760AM Plasma Ok ok

5 09:38:53:040AM Plasma Ok no faults

6 09:56:16:590AM Plasma Ok 620 ka

7 10:15:13:060AM Plasma Ok ok

8 10:39:23:480AM Plasma Ok same

9 10:56:17:580AM Plasma Ok com fail oh2u

10 11:20:57:510AM Plasma Ok disrupt

11 11:35:47:290AM Plasma Ok

12 11:48:40:170AM Plasma Ok plasma pf breaker out

13 12:04:57:900PM Plasma Ok ef3 and ef1 faults after disruption

14 12:20:39:380PM Plasma Ok oh2l comm fault in inversion, ef3 developing a problem

15 12:40:40:850PM Plasma Ok no faults

16 01:02:18:290PM Plasma Ok no faults

17 01:44:53:230PM Plasma Ok oh2u and oh1 comm faults in inversion

18 02:02:33:340PM Plasma Ok oh2u ef1 comm fault

19 02:17:58:120PM Plasma Ok no faults

20 02:30:38:880PM Plasma Ok comm fail ef1 at disruption

21 02:47:00:040PM Plasma Ok no faults

22 03:01:03:240PM Plasma Ok no faults

23 03:17:24:120PM Plasma Ok no faults

24 03:34:28:250PM Plasma Ok disruption - oh1,oh2's,ef1 comm faults

25 03:58:50:970PM Plasma Ok

26 04:18:41:650PM Plasma Ok no faults

27 04:35:13:700PM Plasma Ok no faults

28 04:48:03:440PM Plasma Ok no faults

29 05:02:24:850PM Plasma Ok no faults

Session Leader Comments
Jun 10 1994 08:11:03:770AM		Tom Luke	Today's run will be devoted to the study of core particle transport through gas modulation experiments. We will be trying to run diverted in order that we can better compare measured baseline coefficients with those of detached plasmas. There will be an attempt at scanning in density and plasma current with several shots at each pair of parameters. A few limited shots at the same plasma parameters will be done to compare transport during diverted and limited operation.
Jun 10 1994 08:14:00:090AM		Tom Luke	Today's run will be devoted to the study of core particle transport through gas modulation experiments. We will be trying to run diverted in order that we can better compare measured baseline coefficients with those of detached plasmas. There will be an attempt at scanning in density and plasma current with several shots at each pair of parameters. A few limited shots at the same plasma parameters will be done to compare transport during diverted and limited operation.
Jun 10 1994 08:43:58:990AM	940610001	Tom Luke	Repeat shot 940609011. No puffs. Establishing density flattop. Result:Dud. No data in channel 8 in TCI.
Jun 10 1994 08:57:03:140AM	940610002	Tom Luke	Shot went. Short and disrupted at .5 s. Density looks pretty good and was flattening out.
Jun 10 1994 09:20:44:740AM	940610002	Tom Luke	Shot lasted to 1.16 s. Nice shot. Disrupted on the way down. Try some puffs next time. Lost channel 4 due to camac error.
Jun 10 1994 09:21:46:500AM	940610003	Tom Luke	Shot lasted to 1.16 s. Nice shot. Disrupted on the way down. Try some puffs next time. Lost channel 4 due to camac error.
Jun 10 1994 09:37:26:510AM	940610004	Tom Luke	Put 2 puffs at 650 and 750 ms. 43 V for 20 ms. Puffs appear as steps as opposed to oscillations. Lower puffs by 5 V for next shot and add one at 850 ms.
Jun 10 1994 09:56:24:100AM	940610005	Tom Luke	Put 3 puffs at 650,750 and 850 ms. 38 V for 20 ms for first two and only 10 ms for the third. Puffs are still a little big and we are trying to adjust them.
Jun 10 1994 10:12:14:860AM	940610006	Tom Luke	Put 3 puffs at 650,750 and 850 ms. 38 V for 15 ms for first and 33V for the second and third. Puffs still too big. Reduce them all to 10 ms
Jun 10 1994 10:27:47:660AM	940610007	Tom Luke	Put 3 puffs at 650,750 and 850 ms. 38 V for 15 ms for first and 33V for the second and third. Background denisity is still rising. Puffs look ok, first one is sometimes swamped by diversion.
Jun 10 1994 10:52:39:960AM	940610008	Tom Luke	Sloped the background density too much. It is now decreasing.
Jun 10 1994 11:34:47:130AM	940610009	Tom Luke	Puffs are less noticeable even though denisty has flattened out. Try again
Jun 10 1994 11:33:21:110AM	940610010	Tom Luke	Lost shot at .55s due to vertical instability.
Jun 10 1994 12:11:24:710PM	940610011	Tom Luke	fizzle
Jun 10 1994 12:11:47:970PM	940610012	Tom Luke	Same as 10.
Jun 10 1994 12:33:09:380PM	940610013	Tom Luke	Same as 10.
Jun 10 1994 12:38:50:330PM	940610014	Tom Luke	Good shot. Puffs are steps again. Let's go back and play with the density again.
Jun 10 1994 01:43:47:600PM	940610016	Tom Luke	Good, 4 puffs. First puff may still be a little big. 4.0e19 baseline nl.
Jun 10 1994 02:05:23:400PM	940610016	Tom Luke	Good, 4 puffs. Baseline nl of 4.6e19.
Jun 10 1994 02:23:36:830PM	940610017	Tom Luke	good shot., 3 good puffs.
Jun 10 1994 02:24:15:420PM	940610018	Tom Luke	died at 800 ms.
Jun 10 1994 02:25:32:190PM	940610019	Tom Luke	density lower. Not enough gas??? Reload 17 and up the gas in general and the last puff.
Jun 10 1994 02:45:24:780PM	940610020	Tom Luke	died at 642 ms. ????
Jun 10 1994 04:23:23:240PM	940610024	Tom Luke	Nice flattop, 2 good puffs
Jun 10 1994 04:24:02:020PM	940610025	Tom Luke	Added fifth puff at 1.1s. Nice
Jun 10 1994 04:29:54:810PM	940610026	Tom Luke	Moved x-point location. Died early. Try again
Jun 10 1994 04:42:59:660PM	940610026	Tom Luke	Moved x-point location. Died early. Try again
Jun 10 1994 04:43:25:470PM	940610027	Tom Luke	fizzle for 50 ms. Try again
Jun 10 1994 05:22:35:400PM	940610028	Tom Luke	good shot. Nice clean puffs although background density isn't as flat.
Jun 10 1994 05:22:57:030PM	940610028	Tom Luke	Died. Same vertical problem as before

Physics Operator Comments
Jun 10 1994 08:32:50:800AM		John Goetz	RUN 940610 Mini-Proposal # 55 - Study of Core Particle Transport Start from shot 940609011 - a somewhat nice single null discharge of .60 MA and 1.0 sec duration Changes: more PULSE_GAS_3 after 0.4 to increase the density turn on the CLEARIN from 0.42 to 0.5sec at a value of -.005 to grow the inner gap earlier
Jun 10 1994 08:45:31:290AM	940610001	John Goetz	Shot 940610001: DUD null looks o.k. - Bz crosses zero a little late is it the fact that there was no RF assist? For Shot 940610002: IC_EF4 = -1040A ( was -1030A ) P_0 = 1.1e-5
Jun 10 1994 09:00:02:060AM	940610002	John Goetz	Shot 940610002: plasma - disruption @ 0.542 null looked better than shot 1 lost this plasma down on a ZCUR oscillation For Shot 940610003: Change IC_EF2U ramp to get to -3000A @ 0.55sec Change ZCUR ramp to get to -.015 @ 0.5sec
Jun 10 1994 09:23:11:930AM	940610003	John Goetz	Shot 940610003: plasma - disruption on ramp down @ 1.15 ZCUR oscillation of -.04 @ .545 For Shot 940610004: IC_EF1L to +450 @ 0.5 & -100 @ 0.6 to mimic IC_EF1U and control vertical oscillation put 43V x 0.02sec pulses on PULSE_GAS_3 @ 0.65 & 0.75sec
Jun 10 1994 09:37:52:260AM	940610004	John Goetz	Shot 940610004: plasma - disruption on ramp down @ 1.15 ZCUR oscillation is still there For Shot 940610005: remove 5V from each PULSE_GAS_3 puff add 38V x 0.01sec pulse @ 0.85sec to PULSE_GAS_3
Jun 10 1994 09:59:42:030AM	940610005	John Goetz	Shot 940610005: plasma - disruption on ramp down @ 1.2 ZCUR oscillation is still there For Shot 940610006: extend Ip flattop to 1.1sec reduce first PULSE_GAS_3 width to .015; reduce 2nd and 3rd by 5V EF2U ramp to -3000A @ 0.6 ZCUR ramp from 0.36 to 0.46sec
Jun 10 1994 10:14:04:720AM	940610006	John Goetz	Shot 940610006: plasma - disruption on ramp down @ 1.2 flat-top holds until 1.1 ZCUR oscillation still there For Shot 940610007: ramp down PULSE_GAS_3 during flat-top all puffs now .01sec wide
Jun 10 1994 10:34:21:840AM	940610007	John Goetz	Shot 940610007: plasma - all the way to PF inversion ZCUR oscillation still there For Shot 940610008: ramp down PULSE_GAS_3 more steeply during flat-top puffs are now at 0.7, 0.8, 0.9sec ZCUR ramp now from 0.32 to 0.42sec
Jun 10 1994 11:04:31:740AM	940610008	John Goetz	Shot 940610008: plasma - all the way to PF inversion density is drooping ZCUR oscillation still there For Shot 940610009: make PULSE_GAS_3 less severe during flat-top ZXL ramp from -.005 @ 0.5 to -.01 @ 1.1 turn on CLEARIN gain a little earlier
Jun 10 1994 11:11:48:320AM	940610009	John Goetz	Shot 940610009: plasma - disruption at 1.12 ZCUR oscillation still there liberate a lot of deuterium from 0.3sec until divertor forms For Shot 940610010: try again - no changes
Jun 10 1994 11:34:57:800AM	940610010	John Goetz	Shot 940610010: plasma - disruption at .617 - goes up in trouble starting at .555 - current dropping ZCUR oscillation still there For Shot 940610011: punt - reload 940610009
Jun 10 1994 12:04:41:110PM	940610011	John Goetz	Shot 940610011: fizzle hit something @ .02 and at .025 Bz a bit too negative For Shot 940610012: IC_EF4U to -1035A
Jun 10 1994 12:05:44:130PM	940610012	John Goetz	Shot 940610012: Plasma - disruption @ .617 trouble starts @ .55 density rising too quickly very similar to shot 010 For Shot 940610013: lower PULSE_GAS_3 between 0.1 and 0.3
Jun 10 1994 12:19:46:500PM	940610013	John Goetz	Shot 940610013: Plasma - disruption @ .625 - first disruption at .586 influx of crap @ 0.51 For Shot 940610014: delay start of ZCUR ramp until 0.58sec stairstep on the RXL gain beginning at 0.6 hopefull both of these changes will let the plasma survive the ZCUR bounce
Jun 10 1994 12:40:43:140PM	940610014	John Goetz	Shot 940610014: Plasma - disruption @ 1.13 plasma jumps out at .975sec ZCUR oscillation now only -0.5cm For Shot 940610015: lower PULSE_GAS_3 after each puff to try and hold density constant raise PULSE_GAS_3 early to raise background density level ZXL to -.01 @ 0.8 to flatten time history of EFIT-ZXL
Jun 10 1994 01:24:44:810PM	940610014	John Goetz	Shot 940610014: the jump out in position was due to EF3 crapping out at 0.957 - no reason given by engineering
Jun 10 1994 01:04:27:470PM	940610015	John Goetz	Shot 940610015: Plasma - almost all the way down For Shot 940610016: extend pulse length to 1.2 sec add 4th pulse to PULSE_GAS_3 @ 1.0sec PF inversion times = 1.5 sec extend EF1's and EF2's to 1.3 sec
Jun 10 1994 01:25:12:950PM	940610016	John Goetz	Shot 940610016: SHAPE needed to be rebooted before this shot
Jun 10 1994 01:44:52:690PM	940610016	John Goetz	Shot 940610016: plasma - disruption at 1.32 on the way down nice divertor after about 0.65sec For Shot 940610017: extend RCUR, ZCUR, ZXL, RXL, and CLEARIN to 1.2sec delicate tweaks to PULSE_GAS_3
Jun 10 1994 02:04:14:620PM	940610017	John Goetz	Shot 940610017: plasma - disruption at 1.242 on the way down current rolls over early For Shot 940610018: turn on RXL starting @ 0.56 extend EF2L to 1.2sec TF invert to 1.3sec more volts to 4th puff on PULSE_GAS_3
Jun 10 1994 02:20:01:250PM	940610018	John Goetz	Shot 940610018: plasma - disruption at 0.8 can't explain it ZCUR oscillation is back For Shot 940610019: RXL turning on @ 0.58
Jun 10 1994 02:30:52:160PM	940610019	John Goetz	Shot 940610019: plasma - disruption at 0.65 loss of z-position no ZCUR oscillation, though For Shot 940610020: reload 940610017 up the magnitude of the 4th puff on PULSE_GAS_3 more volts early on PULSE_GAS_3
Jun 10 1994 02:48:02:060PM	940610020	John Goetz	Shot 940610020: plasma - disruption at 0.642 loss of z-position For Shot 940610021: raise the density with more volts on PULSE_GAS_3 early voltage programming on EF2L to 0. @ .45sec overlap gain turn off for IC_EF2L with the gain turn on of RXL the last few shots have not had any feedback on the EF2L
Jun 10 1994 03:00:00:690PM	940610021	John Goetz	Shot 940610021: plasma - disruption at 0.7 quick loss of z-position kappa = 1.4 For Shot 940610022: slow down the ZCUR ramp and hope to retain vertical position control
Jun 10 1994 03:16:54:030PM	940610022	John Goetz	Shot 940610022: plasma - disruption at 0.682 quick loss of z-position For Shot 940610023: RXL on at 0.5 to try and get x-point into machine ZCUR ramp much slower IC_EF2L more negative for longer
Jun 10 1994 03:33:15:660PM	940610023	John Goetz	Shot 940610023: plasma - almost all the way down ZCUR oscillation back - only 2 cm though For Shot 940610024: more volts on PULSE_GAS_3 to up density
Jun 10 1994 03:53:34:000PM	940610024	John Goetz	Shot 940610024: plasma - disruption @ 1.23 For Shot 940610025: add 5th puff to PULSE_GAS_3 @ 1.1 ( 40V x .01sec ) lower 1st puff to PULSE_GAS_3 to 12V
Jun 10 1994 04:07:55:870PM	940610025	John Goetz	Shot 940610025: plasma - disruption @ 1.24 For Shot 940610026: RXL = +.005 from 0.6 to 1.2 ZXL = -.015 from 0.72 to 1.2
Jun 10 1994 04:32:02:180PM	940610026	John Goetz	Shot 940610026: plasma - disruption @ .725 lost vertical position ( due to change in drawn RXL? ) For Shot 940610027: reload shot 940610025
Jun 10 1994 04:44:26:370PM	940610027	John Goetz	Shot 940610027: fizzle - lasted until .06 - hit something at .039 For Shot 940610028: P_0=1.2e-5
Jun 10 1994 05:00:51:730PM	940610028	John Goetz	Shot 940610028: plasma - disruption @ 1.31 For Shot 940610029: first puff on PULSE_GAS_3 moved to .725 second puff eliminated third puff is now @ .85 and is .03
Jun 10 1994 05:10:58:210PM	940610029	John Goetz	Shot 940610029: plasma - disruption @ 0.708 loss of vertical control

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:34:02:680AM	Plasma	Ok	p.s's ok no breakdown
2	08:46:17:590AM	Plasma	Ok	600 ka, oh2 com fault
3	09:00:43:260AM	Plasma	Ok	good
4	09:20:29:760AM	Plasma	Ok	ok
5	09:38:53:040AM	Plasma	Ok	no faults
6	09:56:16:590AM	Plasma	Ok	620 ka
7	10:15:13:060AM	Plasma	Ok	ok
8	10:39:23:480AM	Plasma	Ok	same
9	10:56:17:580AM	Plasma	Ok	com fail oh2u
10	11:20:57:510AM	Plasma	Ok	disrupt
11	11:35:47:290AM	Plasma	Ok
12	11:48:40:170AM	Plasma	Ok	plasma pf breaker out
13	12:04:57:900PM	Plasma	Ok	ef3 and ef1 faults after disruption
14	12:20:39:380PM	Plasma	Ok	oh2l comm fault in inversion, ef3 developing a problem
15	12:40:40:850PM	Plasma	Ok	no faults
16	01:02:18:290PM	Plasma	Ok	no faults
17	01:44:53:230PM	Plasma	Ok	oh2u and oh1 comm faults in inversion
18	02:02:33:340PM	Plasma	Ok	oh2u ef1 comm fault
19	02:17:58:120PM	Plasma	Ok	no faults
20	02:30:38:880PM	Plasma	Ok	comm fail ef1 at disruption
21	02:47:00:040PM	Plasma	Ok	no faults
22	03:01:03:240PM	Plasma	Ok	no faults
23	03:17:24:120PM	Plasma	Ok	no faults
24	03:34:28:250PM	Plasma	Ok	disruption - oh1,oh2's,ef1 comm faults
25	03:58:50:970PM	Plasma	Ok
26	04:18:41:650PM	Plasma	Ok	no faults
27	04:35:13:700PM	Plasma	Ok	no faults
28	04:48:03:440PM	Plasma	Ok	no faults
29	05:02:24:850PM	Plasma	Ok	no faults