Alcator C-Mod Run 1050301 Information

Miniproposals

Miniproposal: 413

Date Filed: 1/19/2005

Title: B-field scaling of error threshold at contant q95 and normalized density

First Author: Robert Granetz

Session Leader: Robert Granetz (shots 1-26)

Operators
Session leader(s):	Robert Granetz
Physics operator(s):	Steve Wolfe,Jim Irby,Steve Wolfe
Engineering operator(s):	Sam Pierson,Bill Byford,Ed Fitzgerald

Engineering Operator Run Comment
MP#413 B-field scaling of error threshold at constant q95 and normalized

Session Leader Plans

Entered: Mar 1 2005 09:42:54:743AM

Author: Robert Granetz

MP 413: B-field scaling of error threshold at constant q95, n/nG, shape, etc.

Session leader: R. Granetz
Physics operator: S. Wolfe

Plan: vary toroidal B-field shot-to-shot, keeping q95, n/nG (and nR/B), shape, plasma regime (ohmic
L-Mode), and applied B-tilde spectrum. At each condition, find the threshold B-tilde amplitude for
locked modes. In order to reduce the number of disruptions, at each condition we will start with a
high value of B-tilde (stable) and reduce it until we get a locked mode appearing. This can be done
by either ramping down the A-coil current during the shot, or shot-to-shot (which might give better
reproducibility).

Parameters: q95=3.1-3.2
n/nG=0.17 (ITER ohmic value) (corresponds to nR/B=0.23e20)
lower single null, ohmic, L-mode
standard A-coil configuration

B-fields: 3, 4, 5, 5.4, 6, 7, and 8 T (or whatever the maximum allowed)

Note that Ip and ne will vary linearly with B in order to keep q95 and n/nG constant.

Entered: Mar 1 2005 10:03:44:510AM

Author: Robert Granetz

Table of desired plasma parameters for equilibrium based on 1050218027 in order to
have q95=3.2 and n/nG=0.17 :

Btor (T) Ip (MA) nebar (10^20 m-3) nl_04 (10^20 m-2)
-------- ------- ----------------- -----------------
3.0 0.61 0.68 0.41
4.0 0.81 0.91 0.55
5.0 1.02 1.14 0.68
5.4 1.10 1.23 0.74
6.0 1.22 1.37 0.82
7.0 1.43 1.59 0.96
8.0 1.63 1.82 1.09

Physics Operators Plans

Entered: Mar 1 2005 08:44:13:993AM

Author: Steve Wolfe

Physics Operator plan for Tuesday, 1-MAR-2005

MP#413 B-field scaling of error threshold at constant q95 and
normalized density.
PO: wolfe
SL: Granetz

Overnight ECDC in D2, with bake at 60C

Engineering setup:
Power systems as on 1050218027
A-coil configuration: standard=+Dtop -Dbot -Jtop +Jbot

Gas setup:
-----------
fill B-Top with 6 psi D2 Hybrid Enabled (PG4)
fill B-side lower with 2 psi Ar Hybrid Enabled (PG1)
fill B-side upper with 30 psi D2 Hybrid DISabled (PG2)
fill (former) C-side with 30 psi D2 Hybrid Enabled (PG3)

Torvac Setup:
--------------
GV1 closed, Bypass to RGA open
Torus gate valves closed in Pulse for 5min after shot

Gate valves:
ECE (assuming no vac problems) and Z-bolo/shutter open

Plan
-----
Run shots at different TF with nR/B~0.2e20 m^-2/T, q95=3.2. For 5.4T
this corresponds to 1.1MA, nl04~1e20.

Start with A-coil on in standard stabilizing orientation, and ramp
down to observe onset of locking.

Entered: Mar 1 2005 09:53:49:057AM

Author: Jim Irby

Overnight ECDC in D2, bake at 60C

Engineering setup:

Gas setup:
-----------

> fill B-side lower with 30 psi Ar Hybrid enabled (PG1)
> fill (former) C-side with 30 psi D2 Hybrid Enabled (PG3)

Torvac Setup:
--------------
GV1 closed, Bypass to RGA open at 160 clicks
Torus gate valves closed in Pulse for 4 min before shot and 6 min after shot

Session Leader Summaries

Entered: Mar 1 2005 07:09:16:400PM

Author: Robert Granetz

Neglecting shot 17, for which n/nG was not close to the desired value (because the
shot disrupted very early), the data is extremely well fit with a Btor exponent
of -1.14. This gives a major radius exponent of 0.58.

Physics Operator Summaries

Entered: Mar 1 2005 07:27:41:840PM

Author: Steve Wolfe

Physics Operator Summary for Tuesday, 1-Mar-2005

MP#413 Locked mode threshold vs B at constant n/nG
SL: Granetz
PO: wolfe
EO: Pierson, Byford, Fitzgerald

Irby and Blip ran off a series of gas puff tests before the run actually
got underway, trying to debug the problems with the before/after
RGA data. First real shot was #4.

Target values were n/nG=0.17, q95=3.2, B=3,4,5.4,6,7T
(we wanted 8T as well, but Jim wouldn't let us).
The A-coil was configured in standard suppression orientation
+Dt -Db -Jt +Jb. The idea was to ramp the acoil down to induce
a locked mode with the intrinsic error inadequately compensated.

We ended up with q95~3.4 instead of 3.2, but otherwise
things went more or less as planned. The machine ran well
except that disruption recovery is still problematic; we had very
few cases of two shots in a row. All of the failed starts were
fizzles except one unexplained dud on shot 7 (and one power system
dud on shot 14 -- see below).

It turned out that the threshold for all these conditions was
very close to the intrinsic error field. Most of the data points
were obtained ramping the A-coil down from ~1500A to zero. Typically
the locked modes happened around 1.3-1.5 sec, with the acoil current
near zero. We ran a couple of tries with acoil ramping up to maximum
to try reversing the intrinsic error. One of these (#17 at 4T) had a
very early locked mode at a lower "model" b21, while the other
(#21 at 6T had no locked mode and was our only full length plasma
of the day.) An attempt to re-do the 4T point bringing the acoil up more
slowly on shot26 was a fizzle.

Problems
--------

We had one dud due to a failure of the commutation switches on
the OH2's to close; this was apparently related to the water having
been inadvertantly turned off when the RF went home.

We had a computer meltdown after shot 21, and ended up taking a
couple of no-power cycles before trying for plasma again.

Scorecard
---------
tests 5
duds 2
fizzles 9
plasmas 10
------- --
shots 26

Session Leader Comments

Mar 1 2005 12:39:41:593PM 1050301004 Robert Granetz 5.4 T, 1.1 MA, 0.68, q95=3.4

B21 applied = 0.9 mT (3.1 kA)
B21 total = 0.5-0.3 mT during flattop

No locked mode during flattop.

Next shot: less A-coil current. Ramp it from 2.0 to 1.0 kA over flattop.

Mar 1 2005 12:37:37:703PM 1050301005 Robert Granetz 5.4 T, 1.1 MA, 0.68, q95=3.4

B21 applied = 0.6-0.3 mT (2.0 -> 1.0 kA)
B21 total = 0.3 - 0.08 - 0.4 mT during flattop

No locked mode during flattop.

Next shot: less A-coil current. Ramp it from 1.5 kA to 0.0 kA over flattop.

Mar 1 2005 02:03:36:750PM 1050301008 Robert Granetz Got it! Locked mode at 1.3 s.

5.4 T, 1.09 MA, 1.13e20 m-3, q95=3.4

A-coil (1.5 -> 0.0 kA)
B21 total = 0.61 mT at threshold

Next shot: 3.0 T, 0.61 MA, 0.68e20 m-3. Ramp A-coil from 1.5 kA to 0.0 kA.

Mar 1 2005 02:45:17:297PM 1050301011 Robert Granetz Got it! Locked mode at 1.38 s.

3.1 T, 0.60 MA, 0.70e20 m-3, q95=3.47

A-coil (1.5 -> 0.0 kA)
B21 total = 0.42 mT at threshold

Next shot: 3.1 T, 0.60 MA, 0.70e20 m-3. Turn A-coil off.

Mar 1 2005 03:10:38:110PM 1050301013 Robert Granetz Got it again! Locked mode at 1.46 s.

3.1 T, 0.60 MA, 0.78e20 m-3, q95=3.47

A-coil current off.
B21 total = 0.46 mT at threshold

Next shot: 4 T, 0.8 MA, 1.14e20 m-3. A-coil ramp 1.5 kA -> 0 kA

Mar 1 2005 03:51:02:970PM 1050301015 Robert Granetz Got it! Locked mode at 1.40 s.

4.1 T, 0.80 MA, 0.95e20 m-3, q95=3.46

A-coil current 1.5 kA -> 0
B21 total = 0.55 mT at threshold

Next shot: 4.1 T, 0.80 MA, 0.95e20 m-3. A-coil ramp 1.5 -> 3.5 kA

Mar 1 2005 04:24:09:547PM 1050301017 Robert Granetz Got it again, but unexpectedly early! Locked mode at 0.57 s.

4.1 T, 0.80 MA, 0.78e20 m-3, q95=3.50

A-coil current 1.5 kA -> 3.0 kA
B21 total = 0.30 mT at threshold

Next shot: 6 T, 1.22 MA, 1.37e20 m-3. A-coil ramp 1.5 -> 0 kA

Mar 1 2005 04:48:07:407PM 1050301019 Robert Granetz Got it! Locked mode at 1.36 s.

6.0 T, 1.20 MA, 1.30e20 m-3, q95=3.35

A-coil current 1.5 kA -> 0.0 kA
B21 total = 0.71 mT at threshold

Next shot: 6.0 T, 1.20 MA, 1.30e20 m-3. A-coil ramp 1.8 -> 3.0 kA

Mar 1 2005 05:22:35:063PM 1050301021 Robert Granetz Lots of the data are missing.

6.0 T, 1.20 MA, ???e20 m-3, q95=???

A-coil current = 1.5 -> 3.5 kA
B21 total <= 0.32 mT during flattop.

No locked mode during flattop.

Next shot: 7.0 T, 1.4 MA, 1.6e20 m-2. A-coil 1.5 kA -> 0

Mar 1 2005 07:21:59:093PM 1050301025 Robert Granetz Got it! Locked mode at 1.35 s.

6.9 T, 1.42 MA, 1.52e20 m-3, q95=3.37

A-coil current 1.5 kA -> 0.0 kA
B21 total = 0.81 mT at threshold

Physics Operator Comments

Mar 1 2005 09:32:43:290AM Steve Wolfe Getting set up for the locked mode b-field scan run.

Load from 1050218027 (last shot from last run)
In seg2:
Increase Ip to 1.1MA
reduce ZXU from .06 to .03
increase nl04 from .8 to 1.0e20
increase Acoil current from 2000 to 3500A, flat across for
first shot.

Save as /home/wolfe/pcs_trees/ shot 1050301000
load/clean - may have to change it if they do
cycle tests with gas

Mar 1 2005 10:26:12:470AM Steve Wolfe Correction to the density-
Bob wants to use n/n_G = 0.17, which seems to correspond
to 2e19 for ITER at 15MA.

This means I need to adjust the nl04 value to 0.74e20
for the 5.4T, 1.1MA case, which seems to be more like
nR/B = 0.15 than 0.2

The rest of the density settings are in Bob's logbook entry
from 10:03AM

Mar 1 2005 11:42:18:063AM Steve Wolfe Irby is done with gas tests.
Get back into pcs and load_from /home/wolfe/pcs_trees 1050301000
Change nl04 to 0.74e20

load into model

Mar 1 2005 10:46:11:953AM 1050301001 Jim Irby got the expected gas puff

PLC programming problem caused diagnostic gatevalves to shut (TCI, PCI, etc) when we manually
shut GV1 and GV2.

before/after data looks okay

Mar 1 2005 11:08:05:170AM 1050301002 Jim Irby density feedback kept D2 puff low to zero.

before/after data looks good

Mar 1 2005 11:32:07:233AM 1050301003 Jim Irby turned off density feedback

added another minute of delay to the eng_rga sleep time (from 4 to 5 minutes)

density feedback was still on --- operator error

rga after data looks okay.

Mar 1 2005 12:24:38:687PM 1050301004 Steve Wolfe Shot#4: Try for 1.1MA, 5.4T, 0.74e20, Acoil program 3500
Increase pg4 puff to 20msec (was 13 from 1050218027)

Disrupted in rampdown
Got a warning on baseline offset on f15 -2.8e-3
looks like it happened at the disruption.
Possible locked mode in rampdown around 1.7sec

Looks like the acoil is overcorrecting by a lot.
According to the model, the intrinsic gets to 7G at
1.5sec, 5G at 1.0sec

The applied field at 3kA is 9G

next shot: change acoil to ramp from 2000A to 1000A at 1.5sec

Mar 1 2005 12:35:09:173PM 1050301005 Steve Wolfe Shot#5: change acoil to ramp from 2000A to 1000A at 1.5sec
(program says 2500@0.4 to 1500@1.5, then to zero)
plasma to 1.6sec, got pretty much what we asked for on
acoil, but no locked mode in flattop.

next shot: start acoil at 1.5 and go to zero at 1.4sec

Mar 1 2005 01:24:08:173PM 1050301007 Steve Wolfe Shot#7: pg4 from 20ms->18ms
start acoil at 1.5 and go to zero at 1.4sec
(program 2000 and 500)
also flatten rampdown program on clearin and rxl
dud! supplies are all there, and we had gas?

Mar 1 2005 01:42:04:360PM 1050301008 Steve Wolfe Shot#8:repeat
start acoil at 1.5 and go to zero at 1.4sec
(program 2000 and 500)
also flatten rampdown program on clearin and rxl
plasma to 1.54sec, Brock probably killed it with a pellet?
locked mode at 1.31sec

next shot: Go to 3T

Mar 1 2005 02:10:02:767PM 1050301009 Steve Wolfe Shot#9: Go to 3T, .61MA, .41 nl04
Leave acoil as is, ramping down from 1500

fizzle

Mar 1 2005 02:24:24:140PM 1050301010 Steve Wolfe Shot#10: Go to 3T, .61MA, .41 nl04
Leave acoil as is, ramping down from 1500
Another fizzle.

Mar 1 2005 02:42:51:437PM 1050301011 Steve Wolfe Shot#11:Drop pg4 to 16ms
Go to 3T, .61MA, .41 nl04
Leave acoil as is, ramping down from 1500
plasma to 1.42
looks like a locked mode at 1.38sec
Acoil is at zero. Model says b21=4G

next shot: repeat with A-coil off from the beginning

Mar 1 2005 02:54:55:110PM 1050301012 Steve Wolfe Shot#12:Drop pg4 to 15ms
Go to 3T, .61MA, .41 nl04
repeat with A-coil off from the beginning
fizzle.

Mar 1 2005 03:04:31:547PM 1050301013 Steve Wolfe Shot#13:repeat
Go to 3T, .61MA, .41 nl04
repeat with A-coil off from the beginning
plasma to 1.5sec,lock at 1.46

next shot: 4T

Mar 1 2005 03:33:14:843PM 1050301014 Steve Wolfe Shot#14: 4T, .81MA, nl04=.55e20
acoil ramp down from 1.5ka at 0.4 to 0 at 1.4sec
(program 2000->500)
dud! Bz is very negative
OH2's are not at the right current.
DPCS is calling for more current.
Looks like the switches didn't close

Mar 1 2005 03:47:29:593PM 1050301015 Steve Wolfe Shot#15: repeat after engineers reset the comm cabinets
4T, .81MA, nl04=.55e20
acoil ramp down from 1.5ka at 0.4 to 0 at 1.4sec
(program 2000->500)
plasma to 1.45sec, lm at 1.4sec

next shot: try ramping acoil up to max

Mar 1 2005 03:55:58:233PM 1050301016 Steve Wolfe Shot#16: 4T, .81MA, nl04=.55e20
acoil ramp up from 1.5ka at 0.4 to 3500 at 1.4sec
(program 2000->4000)

another fizzle.

Mar 1 2005 04:12:27:453PM 1050301017 Steve Wolfe Shot#17: repeat at 4T, .81MA, nl04=.55e20
acoil ramp up from 1.5ka at 0.4 to 3500 at 1.4sec
(program 2000->4000)

plasma to .58sec. It does look like an early locked mode
but the density is low.

next shot: go on up to 6T

Mar 1 2005 04:26:41:953PM 1050301018 Steve Wolfe Shot#18: 6T, 1.22MA, .82e20 nl4,
a coil ramping down 1500->0
pg4 to 14msec

fizzle

Mar 1 2005 04:46:02:580PM 1050301019 Steve Wolfe Shot#19: repeat 6T, 1.22MA, .82e20 nl4,
a coil ramping down 1500->0
pg4 to 14msec

plasma to 1.58sec, LM at 1.36sec, model claims 7.2G
next shot: Try ramping up again

Mar 1 2005 04:56:37:157PM 1050301020 Steve Wolfe Shot#20: repeat 6T, 1.22MA, .82e20 nl4,
a coil ramping up 1300@0.5sec->3500@1.4sec (1800->4000 program)
pg4 still at 14msec

and a fizzle, surprise surprise!

Mar 1 2005 05:18:45:560PM 1050301021 Steve Wolfe Shot#21: repeat 6T, 1.22MA, .82e20 nl4,
a coil ramping up 1300@0.5sec->3500@1.4sec (1800->4000 program)
pg4 still at 14msec
raise current limits on OH1 to 30kA, since 19 railed at the end

plasma full length
There seems to be a data problem. Update
server seemed to not work.

It doesn't look like we had a locked mode on this one.
Model says total b21 never got over 3.5G, so it's not too surprising
Earl finally got his pellet in.

Next shot: 7T

Mar 1 2005 05:39:53:500PM 1050301022 Steve Wolfe Shot#22: 7T, 1.43MA, .96e20 nl04
a coil ramping down 1500@0.5sec->0@1.4sec (2000->500 program)
ic_ef4 from 2000->3000 in seg2
pg4 still at 14msec

No tf, I don't think any PF's except tmx's
Also no data. It still thinks that the current shot is 21.
With luck the shot 21 data will not get overwritten

Mar 1 2005 06:05:16:657PM 1050301022 Steve Wolfe Shot#22: trying a no-power
Still not working, it went green in INIT instantly
ran it on through.
shot advanced some data came through.
It went green in recool very early.

Tom now on the phone

Mar 1 2005 06:15:10:360PM 1050301023 Steve Wolfe Shot#23: try another no-power, just to be sure everything is
synched up

Looks good, getting updates on scopes, and we got gas.

Next shot: go for the 7T point.

Mar 1 2005 06:28:53:203PM 1050301024 Steve Wolfe Shot#24: 7T, 1.43MA, .96e20 nl04
a coil ramping down 1500@0.5sec->0@1.4sec (2000->500 program)
ic_ef4 from 2000->3000 in seg2
pg4 still at 14msec

fizzle, even after all that time it still looks like
a slow current rise. Bz looks a bit positive, relative to
earlier shots. I'm going to leave it alone and just try again.

Mar 1 2005 06:52:30:157PM 1050301025 Steve Wolfe Shot#25: repeat 7T, 1.43MA, .96e20 nl04
a coil ramping down 1500@0.5sec->0@1.4sec (2000->500 program)
ic_ef4 from 2000->3000 in seg2
pg4 still at 14msec

Plasma to 1.6sec, disrupted in rampdown
locked mode at 1.33sec,

breakers puled out late, after the disruption and
after the TF was already down. Phase sequence errors;
looks like we pulled the alternator down?

Next shot: re-try at 4T, like #17, but try to delay it.

Mar 1 2005 07:17:59:707PM 1050301026 Steve Wolfe Shot#26: re-try at 4T, .81MA, .55e20
A-coil program ramping up from 0@0.2s to 4000@1.4

fizzle. That's all.

Engineering Operator Comments

Shot Time Type Status Comment

1 10:30:46:983AM Test Ok Gas Test.

2 10:51:51:953AM Test Ok Gas Test 2

3 11:13:21:670AM Test Ok

4 12:07:42:470PM Test Ok

5 12:29:03:623PM Plasma Ok

6 12:58:26:187PM Plasma Ok

7 01:11:52:390PM Plasma Ok

8 01:37:58:813PM Plasma Ok

9 02:05:36:577PM Plasma Ok

10 02:20:01:920PM Plasma Ok

11 02:36:21:627PM Plasma Ok

12 02:49:08:890PM Plasma Ok

13 03:01:41:080PM Plasma Ok

14 03:25:07:563PM Plasma Ok

15 03:41:00:517PM Plasma Ok

16 03:53:27:970PM Plasma Ok

17 04:05:57:937PM Plasma Ok

18 04:24:12:220PM Plasma Ok

19 04:38:37:267PM Plasma Ok

20 04:51:49:563PM Plasma Ok

21 05:09:37:483PM Test Bad power supply systems did not trigger

22 05:35:31:843PM Test Ok This was a no power test shot

23 06:12:46:360PM Test Ok This was a no power test shot

24 06:23:50:827PM Plasma Ok

25 06:41:44:390PM Plasma Bad Power supply systems exhibeted type 1faults on TF, EF1U@LOH1 and

26 07:16:19:227PM Plasma Ok

Session Leader Comments
Mar 1 2005 12:39:41:593PM	1050301004	Robert Granetz	5.4 T, 1.1 MA, 0.68, q95=3.4 B21 applied = 0.9 mT (3.1 kA) B21 total = 0.5-0.3 mT during flattop No locked mode during flattop. Next shot: less A-coil current. Ramp it from 2.0 to 1.0 kA over flattop.
Mar 1 2005 12:37:37:703PM	1050301005	Robert Granetz	5.4 T, 1.1 MA, 0.68, q95=3.4 B21 applied = 0.6-0.3 mT (2.0 -> 1.0 kA) B21 total = 0.3 - 0.08 - 0.4 mT during flattop No locked mode during flattop. Next shot: less A-coil current. Ramp it from 1.5 kA to 0.0 kA over flattop.
Mar 1 2005 02:03:36:750PM	1050301008	Robert Granetz	Got it! Locked mode at 1.3 s. 5.4 T, 1.09 MA, 1.13e20 m-3, q95=3.4 A-coil (1.5 -> 0.0 kA) B21 total = 0.61 mT at threshold Next shot: 3.0 T, 0.61 MA, 0.68e20 m-3. Ramp A-coil from 1.5 kA to 0.0 kA.
Mar 1 2005 02:45:17:297PM	1050301011	Robert Granetz	Got it! Locked mode at 1.38 s. 3.1 T, 0.60 MA, 0.70e20 m-3, q95=3.47 A-coil (1.5 -> 0.0 kA) B21 total = 0.42 mT at threshold Next shot: 3.1 T, 0.60 MA, 0.70e20 m-3. Turn A-coil off.
Mar 1 2005 03:10:38:110PM	1050301013	Robert Granetz	Got it again! Locked mode at 1.46 s. 3.1 T, 0.60 MA, 0.78e20 m-3, q95=3.47 A-coil current off. B21 total = 0.46 mT at threshold Next shot: 4 T, 0.8 MA, 1.14e20 m-3. A-coil ramp 1.5 kA -> 0 kA
Mar 1 2005 03:51:02:970PM	1050301015	Robert Granetz	Got it! Locked mode at 1.40 s. 4.1 T, 0.80 MA, 0.95e20 m-3, q95=3.46 A-coil current 1.5 kA -> 0 B21 total = 0.55 mT at threshold Next shot: 4.1 T, 0.80 MA, 0.95e20 m-3. A-coil ramp 1.5 -> 3.5 kA
Mar 1 2005 04:24:09:547PM	1050301017	Robert Granetz	Got it again, but unexpectedly early! Locked mode at 0.57 s. 4.1 T, 0.80 MA, 0.78e20 m-3, q95=3.50 A-coil current 1.5 kA -> 3.0 kA B21 total = 0.30 mT at threshold Next shot: 6 T, 1.22 MA, 1.37e20 m-3. A-coil ramp 1.5 -> 0 kA
Mar 1 2005 04:48:07:407PM	1050301019	Robert Granetz	Got it! Locked mode at 1.36 s. 6.0 T, 1.20 MA, 1.30e20 m-3, q95=3.35 A-coil current 1.5 kA -> 0.0 kA B21 total = 0.71 mT at threshold Next shot: 6.0 T, 1.20 MA, 1.30e20 m-3. A-coil ramp 1.8 -> 3.0 kA
Mar 1 2005 05:22:35:063PM	1050301021	Robert Granetz	Lots of the data are missing. 6.0 T, 1.20 MA, ???e20 m-3, q95=??? A-coil current = 1.5 -> 3.5 kA B21 total <= 0.32 mT during flattop. No locked mode during flattop. Next shot: 7.0 T, 1.4 MA, 1.6e20 m-2. A-coil 1.5 kA -> 0
Mar 1 2005 07:21:59:093PM	1050301025	Robert Granetz	Got it! Locked mode at 1.35 s. 6.9 T, 1.42 MA, 1.52e20 m-3, q95=3.37 A-coil current 1.5 kA -> 0.0 kA B21 total = 0.81 mT at threshold

Physics Operator Comments
Mar 1 2005 09:32:43:290AM		Steve Wolfe	Getting set up for the locked mode b-field scan run. Load from 1050218027 (last shot from last run) In seg2: Increase Ip to 1.1MA reduce ZXU from .06 to .03 increase nl04 from .8 to 1.0e20 increase Acoil current from 2000 to 3500A, flat across for first shot. Save as /home/wolfe/pcs_trees/ shot 1050301000 load/clean - may have to change it if they do cycle tests with gas
Mar 1 2005 10:26:12:470AM		Steve Wolfe	Correction to the density- Bob wants to use n/n_G = 0.17, which seems to correspond to 2e19 for ITER at 15MA. This means I need to adjust the nl04 value to 0.74e20 for the 5.4T, 1.1MA case, which seems to be more like nR/B = 0.15 than 0.2 The rest of the density settings are in Bob's logbook entry from 10:03AM
Mar 1 2005 11:42:18:063AM		Steve Wolfe	Irby is done with gas tests. Get back into pcs and load_from /home/wolfe/pcs_trees 1050301000 Change nl04 to 0.74e20 load into model
Mar 1 2005 10:46:11:953AM	1050301001	Jim Irby	got the expected gas puff PLC programming problem caused diagnostic gatevalves to shut (TCI, PCI, etc) when we manually shut GV1 and GV2. before/after data looks okay
Mar 1 2005 11:08:05:170AM	1050301002	Jim Irby	density feedback kept D2 puff low to zero. before/after data looks good
Mar 1 2005 11:32:07:233AM	1050301003	Jim Irby	turned off density feedback added another minute of delay to the eng_rga sleep time (from 4 to 5 minutes) density feedback was still on --- operator error rga after data looks okay.
Mar 1 2005 12:24:38:687PM	1050301004	Steve Wolfe	Shot#4: Try for 1.1MA, 5.4T, 0.74e20, Acoil program 3500 Increase pg4 puff to 20msec (was 13 from 1050218027) Disrupted in rampdown Got a warning on baseline offset on f15 -2.8e-3 looks like it happened at the disruption. Possible locked mode in rampdown around 1.7sec Looks like the acoil is overcorrecting by a lot. According to the model, the intrinsic gets to 7G at 1.5sec, 5G at 1.0sec The applied field at 3kA is 9G next shot: change acoil to ramp from 2000A to 1000A at 1.5sec
Mar 1 2005 12:35:09:173PM	1050301005	Steve Wolfe	Shot#5: change acoil to ramp from 2000A to 1000A at 1.5sec (program says 2500@0.4 to 1500@1.5, then to zero) plasma to 1.6sec, got pretty much what we asked for on acoil, but no locked mode in flattop. next shot: start acoil at 1.5 and go to zero at 1.4sec
Mar 1 2005 01:24:08:173PM	1050301007	Steve Wolfe	Shot#7: pg4 from 20ms->18ms start acoil at 1.5 and go to zero at 1.4sec (program 2000 and 500) also flatten rampdown program on clearin and rxl dud! supplies are all there, and we had gas?
Mar 1 2005 01:42:04:360PM	1050301008	Steve Wolfe	Shot#8:repeat start acoil at 1.5 and go to zero at 1.4sec (program 2000 and 500) also flatten rampdown program on clearin and rxl plasma to 1.54sec, Brock probably killed it with a pellet? locked mode at 1.31sec next shot: Go to 3T
Mar 1 2005 02:10:02:767PM	1050301009	Steve Wolfe	Shot#9: Go to 3T, .61MA, .41 nl04 Leave acoil as is, ramping down from 1500 fizzle
Mar 1 2005 02:24:24:140PM	1050301010	Steve Wolfe	Shot#10: Go to 3T, .61MA, .41 nl04 Leave acoil as is, ramping down from 1500 Another fizzle.
Mar 1 2005 02:42:51:437PM	1050301011	Steve Wolfe	Shot#11:Drop pg4 to 16ms Go to 3T, .61MA, .41 nl04 Leave acoil as is, ramping down from 1500 plasma to 1.42 looks like a locked mode at 1.38sec Acoil is at zero. Model says b21=4G next shot: repeat with A-coil off from the beginning
Mar 1 2005 02:54:55:110PM	1050301012	Steve Wolfe	Shot#12:Drop pg4 to 15ms Go to 3T, .61MA, .41 nl04 repeat with A-coil off from the beginning fizzle.
Mar 1 2005 03:04:31:547PM	1050301013	Steve Wolfe	Shot#13:repeat Go to 3T, .61MA, .41 nl04 repeat with A-coil off from the beginning plasma to 1.5sec,lock at 1.46 next shot: 4T
Mar 1 2005 03:33:14:843PM	1050301014	Steve Wolfe	Shot#14: 4T, .81MA, nl04=.55e20 acoil ramp down from 1.5ka at 0.4 to 0 at 1.4sec (program 2000->500) dud! Bz is very negative OH2's are not at the right current. DPCS is calling for more current. Looks like the switches didn't close
Mar 1 2005 03:47:29:593PM	1050301015	Steve Wolfe	Shot#15: repeat after engineers reset the comm cabinets 4T, .81MA, nl04=.55e20 acoil ramp down from 1.5ka at 0.4 to 0 at 1.4sec (program 2000->500) plasma to 1.45sec, lm at 1.4sec next shot: try ramping acoil up to max
Mar 1 2005 03:55:58:233PM	1050301016	Steve Wolfe	Shot#16: 4T, .81MA, nl04=.55e20 acoil ramp up from 1.5ka at 0.4 to 3500 at 1.4sec (program 2000->4000) another fizzle.
Mar 1 2005 04:12:27:453PM	1050301017	Steve Wolfe	Shot#17: repeat at 4T, .81MA, nl04=.55e20 acoil ramp up from 1.5ka at 0.4 to 3500 at 1.4sec (program 2000->4000) plasma to .58sec. It does look like an early locked mode but the density is low. next shot: go on up to 6T
Mar 1 2005 04:26:41:953PM	1050301018	Steve Wolfe	Shot#18: 6T, 1.22MA, .82e20 nl4, a coil ramping down 1500->0 pg4 to 14msec fizzle
Mar 1 2005 04:46:02:580PM	1050301019	Steve Wolfe	Shot#19: repeat 6T, 1.22MA, .82e20 nl4, a coil ramping down 1500->0 pg4 to 14msec plasma to 1.58sec, LM at 1.36sec, model claims 7.2G next shot: Try ramping up again
Mar 1 2005 04:56:37:157PM	1050301020	Steve Wolfe	Shot#20: repeat 6T, 1.22MA, .82e20 nl4, a coil ramping up 1300@0.5sec->3500@1.4sec (1800->4000 program) pg4 still at 14msec and a fizzle, surprise surprise!
Mar 1 2005 05:18:45:560PM	1050301021	Steve Wolfe	Shot#21: repeat 6T, 1.22MA, .82e20 nl4, a coil ramping up 1300@0.5sec->3500@1.4sec (1800->4000 program) pg4 still at 14msec raise current limits on OH1 to 30kA, since 19 railed at the end plasma full length There seems to be a data problem. Update server seemed to not work. It doesn't look like we had a locked mode on this one. Model says total b21 never got over 3.5G, so it's not too surprising Earl finally got his pellet in. Next shot: 7T
Mar 1 2005 05:39:53:500PM	1050301022	Steve Wolfe	Shot#22: 7T, 1.43MA, .96e20 nl04 a coil ramping down 1500@0.5sec->0@1.4sec (2000->500 program) ic_ef4 from 2000->3000 in seg2 pg4 still at 14msec No tf, I don't think any PF's except tmx's Also no data. It still thinks that the current shot is 21. With luck the shot 21 data will not get overwritten
Mar 1 2005 06:05:16:657PM	1050301022	Steve Wolfe	Shot#22: trying a no-power Still not working, it went green in INIT instantly ran it on through. shot advanced some data came through. It went green in recool very early. Tom now on the phone
Mar 1 2005 06:15:10:360PM	1050301023	Steve Wolfe	Shot#23: try another no-power, just to be sure everything is synched up Looks good, getting updates on scopes, and we got gas. Next shot: go for the 7T point.
Mar 1 2005 06:28:53:203PM	1050301024	Steve Wolfe	Shot#24: 7T, 1.43MA, .96e20 nl04 a coil ramping down 1500@0.5sec->0@1.4sec (2000->500 program) ic_ef4 from 2000->3000 in seg2 pg4 still at 14msec fizzle, even after all that time it still looks like a slow current rise. Bz looks a bit positive, relative to earlier shots. I'm going to leave it alone and just try again.
Mar 1 2005 06:52:30:157PM	1050301025	Steve Wolfe	Shot#25: repeat 7T, 1.43MA, .96e20 nl04 a coil ramping down 1500@0.5sec->0@1.4sec (2000->500 program) ic_ef4 from 2000->3000 in seg2 pg4 still at 14msec Plasma to 1.6sec, disrupted in rampdown locked mode at 1.33sec, breakers puled out late, after the disruption and after the TF was already down. Phase sequence errors; looks like we pulled the alternator down? Next shot: re-try at 4T, like #17, but try to delay it.
Mar 1 2005 07:17:59:707PM	1050301026	Steve Wolfe	Shot#26: re-try at 4T, .81MA, .55e20 A-coil program ramping up from 0@0.2s to 4000@1.4 fizzle. That's all.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	10:30:46:983AM	Test	Ok	Gas Test.
2	10:51:51:953AM	Test	Ok	Gas Test 2
3	11:13:21:670AM	Test	Ok
4	12:07:42:470PM	Test	Ok
5	12:29:03:623PM	Plasma	Ok
6	12:58:26:187PM	Plasma	Ok
7	01:11:52:390PM	Plasma	Ok
8	01:37:58:813PM	Plasma	Ok
9	02:05:36:577PM	Plasma	Ok
10	02:20:01:920PM	Plasma	Ok
11	02:36:21:627PM	Plasma	Ok
12	02:49:08:890PM	Plasma	Ok
13	03:01:41:080PM	Plasma	Ok
14	03:25:07:563PM	Plasma	Ok
15	03:41:00:517PM	Plasma	Ok
16	03:53:27:970PM	Plasma	Ok
17	04:05:57:937PM	Plasma	Ok
18	04:24:12:220PM	Plasma	Ok
19	04:38:37:267PM	Plasma	Ok
20	04:51:49:563PM	Plasma	Ok
21	05:09:37:483PM	Test	Bad	power supply systems did not trigger
22	05:35:31:843PM	Test	Ok	This was a no power test shot
23	06:12:46:360PM	Test	Ok	This was a no power test shot
24	06:23:50:827PM	Plasma	Ok
25	06:41:44:390PM	Plasma	Bad	Power supply systems exhibeted type 1faults on TF, EF1U@LOH1 and
26	07:16:19:227PM	Plasma	Ok