Alcator C-Mod Run 1021002 Information

Miniproposals

Miniproposal: 323

Date Filed: 9/23/2002

Title: Scoping Experiments for Upper Divertor Cryopump Operationin Unbalanced Double-Null H-mode Discharges

First Author: Brian Labombard

Session Leader: Brian Labombard (shots 1-31)

Operators
Session leader(s):	Brian Labombard
Physics operator(s):	Ian Hutchinson
Engineering operator(s):	Ed Fitzgerald,Gary Dekow

Engineering Operator Run Comment
MP#323 Scoping for upper cryopump; SL: LaBombard; PO: Hutch; EO: Dekow/F

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:30:930PM

Author: To Be Determined

Run Summary for 1021002
MP#323 "Scoping Experiments for Upper Divertor Cryopump Operation
in Unbalanced Double Null H-mode discharges"

Session Leader: B. LaBombard
Physics Operator: I. Hutchinson

MP Objectives:

The purpose of today's experiments was to assess the
potential performance of a cryopump located in the upper
divertor for density control in H-mode discharges.
The goals were two-fold: (1) determine the range of neutral pressures
in the upper chamber for a variety of secondary separatrix locations and
(2) quantify the active deuterium inventory in the plasma, neutral gas, and walls.

Approach:

Run a series of RF heated (2 MW) H-mode discharges (1 MA, 5.3 T)
with different upper x-point programs. Monitor pressures in the upper chamber
with the baratron gauge at E-top (E_top_mks). Monitor the total active gas
inventory with instrumented gas input plenums and by operating with the pumping
stack gate valves closed.

Results:

By the end of the day, we got a basic set of neutral pressure and gas
inventory measurements for a range of SSEPs, but it did not come easy.
The RF systems performed very well, routinely supplying 2MW with few
trips despite the fact that there were many H-L-H-... transitions.
Unfortunately, all H-modes were short-lived and far from EDA. Radiated power
was high, supporting the H-L-H-... duty-cycle behavior.

Shots 1-5 were gas calibration shots. We calibrated the NINJA
plenums (large and small) as well as piezo valve plenums.
By shot 18, Ian had put together and debugged a SSEP control
wire on the PCS. This enabled us to quickly scan SSEP and
density in subsequent shots, as called out in the run
plan. Future MPs should consider using the new SSEP control
knob.

Luck had it that today was the day for one of the INCAAs
in the J-port gas-rack to die. Of course, this INCAA was the one
that records all the gas gauge pressures. Fortunately Joe Bosco
located a replacement unit.

With the exception of very low target densities (NL04~0.4, shot#31),
neutral pressures in the upper divertor always exceeded 1 mtorr with
SSEP at -0.3 or greater. As a "rule of thumb", the pressure in the
upper chamber (E-top) is similar to the pressure in a lower divertor
open port (E-bottom) for SSEP at -0.3 or greater. Judging by how
the lower divertor responds, baffling in the upper chamber should
increase the pressure there by a factor of 2.

The gas inventory measurements clearly showed that the wall
typically retains about 10 torr-liters of D2 (rough numbers),
which appears to be released over a long time scale after the shot;
the torus pressure was seen to rise slightly over the few seconds when the
gate valves were closed. Shots with disruptions (13, 17, 29) resulted in a
prompt release of gas from the wall which was recorded as large torus pressures
after the shot (gate-valves closed). On shot 29, the wall was seen to
release about 150 torr-liters! Perhaps deuterium-rich surface layers
(boron/deuterium compounds) are ablated by the disruption heat loads.

Important note: We were able to run H-modes in upper x-point
geometry today (SNU) by taking an H-mode and sweeping the geometry
from SNL to SNU (see shot 16). It is apparent that although the H-mode
threshold cares about being in SNL, it does not care if the geometry
becomes upper x-point dominant once H-mode is achieved.

Detailed Shot Log

All shots were run with pumping stack gate-valves closed and DNB gate
valve closed.

Shot 1 - gas only test using waveforms from 1020718007
Did not get desired waveforms. Fizzle detector was enabled!
NINJA not puffing

Shot 2 - gas only test using waveforms from 1020718007
Did not get desired waveforms. Fizzle detector was enabled!
NINJA enabled. Puff from B16-001 with small plenum

Shot 3 - gas only test using waveforms from 1020718007
Did not get desired waveforms. Fizzle detector was enabled!
NINJA enabled. Puff from B16-001 with large plenum

Shot 4 - gas only test using waveforms from 1020718007
Got desired waveforms, except for B-side-upper.
NINJA enabled. Puff from ABLim with large plenum
DNB gate valve closed. ECE gate valve opening.

B side-upper: -1 sec, 0.0 sec pulse 10 psi D2
C-side: 1 sec, 0.1 sec pulse 30 psi D2
B-Top: 3 sec, 0.5 sec pulse 6 psi D2
J-Bottom: 5 sec, 0.5 sec pulse 30 psi D2
NINJA:ABLim: 7 sec, 0.1 sec pulse 20 psi D2

Shot 5 - Gas only test shot. NINJA enabled. Puff from ABLim with small plenum.
DNB gate valve closed. ECE gate valve opening.

B side-upper: -1 sec, 0.5 sec pulse 10 psi D2
C-side: 1 sec, 0.1 sec pulse 30 psi D2
B-Top: 3 sec, 0.5 sec pulse 6 psi D2
J-Bottom: 5 sec, 0.5 sec pulse 30 psi D2
NINJA:ABLim: 7 sec, 0.1 sec pulse 20 psi D2

Shot 6 - dud
Shot 7 - dud
Shot 8 - fizzle

Shot 9 - Target NL04 ~ 1.0, got 4 H-Modes - they look of the ELM-free kind.
Nice RF: 1MW from D and E.
More gas in than out - wall is pumping.
SSEP around -1.6, E-top = 0.5 mtorr/ E-bottom=10 mtorr.

Shot 10 - fizzle

Shot 11 - Target NL04 ~ 0.95, got 4 H-Modes - similar to shot 9
again nice RF: 1MW from D and E.
ISP scanning at 0.8, 1.0, and 1.2 seconds.
More gas in than out - wall is still pumping.
SSEP around -1.6, E-top = 0.3 mtorr/ E-bottom = 6 mtorr.

Shot 12 - fizzle

Shot 13 - Disrupted at .837. BN tile in divertor glows brightly.
G-side ratiomatic was off on this shot.
Got more gas out than we put in - result of disruption.

Shot 14 - Target NL04 ~ 0.9, multi H-Modes
nice RF: 1MW from D and E.
SSEP goes to zero at 0.8
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
E-top = 2 mtorr/ E-bottom = 2 mtorr when SSEP=0

Shot 15 - Target NL04 ~ 0.9, multi H-Modes
nice RF: 1MW from D and E.
SSEP goes above zero at 0.7
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
E-top = 2 mtorr (going to 7 mtorr in SNU, L-mode phase)/ E-bottom = 2 mtorr

Shot 16 - Target NL04 ~ 0.9, two+ H-Modes, first H-mode persists in SNU.
nice RF: 2MW
SSEP goes to +5 mm
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
E-top = 5 to 8 mtorr / E-bottom = 2 mtorr

Shot 17 - Target NL04 ~ 0.9, H-mode, disrupted at 1.02 seconds - ASP killed it.
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.

Shot 18 - Target NL04 ~ 0.9, multi H-modes
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at -1 cm.
G-side ratiomatic was off, problem with B-bottom MKS and CB-Div Penning signal

Shot 19 - fizzle

Shot 20 - Target NL04 ~ 0.9, multi H-modes, repeat of shot 18
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
Nice ASP data at 1.0 seconds.
SSEP controlled, flat at -1.2 cm.
=>>camac problem for gas gauge signals

Stop to swap some INCAA units in gas gauge rack.

Shot 21 - Target NL04 ~ 0.8, multi H-modes
RF: 2MW
ASP scanning at 0.8, 1.0, and 1.2 seconds.
ISP not scanning.
SSEP controlled, flat at -1.3 cm.
Gas gauge signals are now working.
E-top: 0.5 to 1.0 mtorr/ E-Bottom: 5 to 7 mtorr

Shot 22 - Target NL04 ~ 0.8, multi H-modes
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at -0.8 cm.
E-top: 1.7 mtorr/ E-Bottom: 7 mtorr

Pausing for cell access so RF group can track down
some bad cables

Shot 23 - Target NL04 ~ 0.9 prior to RF pulse, couple of H-modes
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at -0.4 cm.
E-top: 3.5 mtorr/ E-Bottom: 5 mtorr

Shot 24 - Target NL04 ~ 0.9, 4 H-modes
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat near 0.
E-top: 3.5 mtorr/ E-Bottom: 4 mtorr

Shot 25 - Target NL04 ~ 0.9, H-modes late in shot where SSEP bounces through zero
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at +0.3 cm.
E-top: 8 mtorr/ E-Bottom: 4 mtorr

Shot 26 - fizzle

Shot 27 - Target NL04 ~ 1.0, late H-modes
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
very nice ASP data
SSEP controlled, flat at -0.2 cm.
E-top: 3 mtorr, down to 2 mtorr during H-mode/ E-Bottom: 4 mtorr

Shot 28 - Target NL04 ~ 0.65, 3 H-modes
RF: 2MW, D trips
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at -0.2 cm.
E-top: 1 mtorr / E-Bottom: 2 mtorr

Shot 29 - Target NL04 ~ 0.4, 3 H-modes, disrupts at 1.37 seconds
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at -0.2 cm.
E-top: 0.5 mtorr / E-Bottom: 1.5 mtorr

Shot 30 - fizzle

Shot 31 - Target NL04 ~ 1.1, 3 H-modes
RF: 2MW, with trips
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at -0.2 cm.
E-top: 15 mtorr dropping to 5 mtorr / E-Bottom: 7 mtorr

Physics Operator Summaries

Entered: Jul 7 2004 04:37:16:410PM

Author: To Be Determined

Physop Summary 1021002
______________________

MP323 Scoping Experiments for Upper Divertor Cryopump Operation
in Unbalanced Double Null H-mode discharges.

PO Hutch
SL LaBombard

Summary
_______

Run started with 5 gas only shots and then two duds. Needed ECDC to
get going and had some fizzle problems till things settled down.

The new SSEP controller was exercised and proved very successful. On
shot 20 a better version of SSEP was installed. The first one had an
incorrect algorithm that gave too much SSEP for a given demand. The
2-Oct-02 version we ended up with is reasonably accurate in
amplitude. It has an offset which is now corrected within the PCS
system. Using integral as well as proportional gain, very good control
results. This controller is probably worth using in place of zxu if
you want to keep the SSEP really steady.

A bug in EFIT was discovered. In close-to-double-null cases
it reports positive SSEP even if it is negative. Steve Wolfe knows how
to fix this.

Scorecard
_________

Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax
1 0.000 0.002 2 0.000 0.002
3 0.000 0.002 4 0.000 0.002
5 0.000 0.002 6 0.000 0.022
7 0.000 0.022 8 0.000 0.025
9 1.928 1.037 10 0.000 0.027
11 1.955 1.040 12 0.000 0.027
13 0.843 1.054 14 1.958 1.046
15 1.960 1.046 16 1.954 1.046
17 1.028 1.035 18 1.957 1.037
19 0.000 0.047 20 1.956 1.040
21 1.957 1.040 22 1.956 1.035
23 1.957 1.034 24 1.956 1.036
25 1.926 1.036 26 0.000 0.035
27 1.960 1.037 28 1.964 1.042
29 1.378 1.041 30 0.000 0.042
31 1.954 1.031
Finished summary for 1021002 Total of 31 shots.
31 shots. 18 plasmas. 3 fizzles. 10 duds.
Fizzle = gt 27.0 lt 50kA.

Details.
________

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1021002xxx hutch PHYSICS_OPERATOR Oct 2 2002 8:51:42:906AM
. . . . . . . . . . . . . . . . . . . .
MP323 Scoping Experiments for Upper Divertor Cryopump Operation
in Unbalanced Double Null H-mode discharges.

The fluxihh code was modified yesterday to add a new predictor SSEP.
It consists of the flux difference between the positions of the nominal
upper and lower x-points, scaled to be in units of outer midplane radius,
rho.

Start PCS. Load segment 2 from 1020920020.
Install SSEP on wire 11.
Apply.
Call the predictor.
Put a small proportional gain on controller. .05=.2/s physics.
Open controller. Put the keywords to:
ALLNAMES=['PSI0','RCUR','ZCUR','CLEARIN','RXL','ZXL','RXU','SSEP']
Call. OK.
Get a pop-up to confirm the rate. It says
scaled_controller=controller(i)/rate(i)*common_rate.
Which is horribly ambiguous as well as unclear. It offers:
rate =9.19279 and says please enter the new common rate /sec.
Just ok the common rate that is present, namely 4.
OK. Seems ok except that it is lower case, implying not on.
The factor seems to have to be very small:
0.00023
----------------------------------------------------------------------------
1021002001 irby PHYSICS_OPERATOR Oct 2 2002 7:56:03:016AM
. . . . . . . . . . . . . . . . . . . .
Loaded shot 1020718007 ---- gas and gauge calibration shot

Pressure gauges and plenum readings look okay --- but will need Brian to enable Ninja
----------------------------------------------------------------------------
1021002002 irby PHYSICS_OPERATOR Oct 2 2002 8:44:27:216AM
. . . . . . . . . . . . . . . . . . . .
Brian has turned on the Ninja

We have enabled more gas puff valves --- but not j-bottom as yet

----------------------------------------------------------------------------
1021002003 irby PHYSICS_OPERATOR Oct 2 2002 8:53:17:630AM
. . . . . . . . . . . . . . . . . . . .
Reloaded 1020718007 ---- AND DID A LOAD/CLEAN

May have j-bottom this time

Still need to delay fizzle
----------------------------------------------------------------------------
1021002004 irby PHYSICS_OPERATOR Oct 2 2002 9:06:08:243AM
. . . . . . . . . . . . . . . . . . . .
Fizzle detector to 10 seconds

Looks much better --- but missed b-side-upper

take one more shot
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1021002005 irby PHYSICS_OPERATOR Oct 2 2002 9:18:19:103AM
. . . . . . . . . . . . . . . . . . . .
enabled b-side-upper

j-bottom seems to have a problem
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1021002005 hutch PHYSICS_OPERATOR Oct 2 2002 9:36:14:433AM
. . . . . . . . . . . . . . . . . . . .
Found that the ssep not becoming upper case was related to
building the segment. After having done that it becomes SSEP.

Load the SSEP controller into the model.
----------------------------------------------------------------------------
1021002006 hutch PHYSICS_OPERATOR Oct 2 2002 9:49:13:843AM
. . . . . . . . . . . . . . . . . . . .
First plasma attempt.
Dud. Fields look ok.

Increase gas puff to 25ms from 23ms.
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1021002007 hutch PHYSICS_OPERATOR Oct 2 2002 10:11:28:700AM
. . . . . . . . . . . . . . . . . . . .
Dud. Call for 5minutes of ECDC.
----------------------------------------------------------------------------
1021002008 hutch PHYSICS_OPERATOR Oct 2 2002 10:25:02:406AM
. . . . . . . . . . . . . . . . . . . .
Fizzle.

Br to 1.8mT from 2.
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1021002009 hutch PHYSICS_OPERATOR Oct 2 2002 10:39:05:383AM
. . . . . . . . . . . . . . . . . . . .
Plasma. SSEP phys A out reads -5000.

Insert SSEP gain of 1 at 1s.
nl04 to .9 from 1.
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1021002010 hutch PHYSICS_OPERATOR Oct 2 2002 10:51:54:903AM
. . . . . . . . . . . . . . . . . . . .
Fizzle.

ICEF4 to -1315 from -1325. Br back to 2mT.
Rcur to .69 from .68 at 1ms.
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1021002011 hutch PHYSICS_OPERATOR Oct 2 2002 11:09:29:870AM
. . . . . . . . . . . . . . . . . . . .
Plasma.

ZXU gain to 1 from 6 at .3s.
ICEF4 to -1320
Fill puff to 23ms.
zcur to -.01 from -.015.
rxl to -.006 from -.012 to get strike point off tile.
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1021002012 hutch PHYSICS_OPERATOR Oct 2 2002 11:24:59:803AM
. . . . . . . . . . . . . . . . . . . .
Fizzle.

br to 2.2mT
Fill puff to 21ms.
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1021002013 hutch PHYSICS_OPERATOR Oct 2 2002 11:37:05:196AM
. . . . . . . . . . . . . . . . . . . .
Plasma disrupts at .8s due to big injection.
Tile glows brightly.

zxl to 0.
SSEP gain step to .6s.
Install SSEP wiggle.
Br to 2mT
ICEF4 to -1325.
----------------------------------------------------------------------------
1021002014 hutch PHYSICS_OPERATOR Oct 2 2002 11:54:36:056AM
. . . . . . . . . . . . . . . . . . . .
Plasma. Nearly double null. Control of SSEP is not clear.

Bt to 150kA at .1 to match the segment switch.
Argon to 30ms from 40ms puff.
SSEP gain to 5.
----------------------------------------------------------------------------
1021002015 hutch PHYSICS_OPERATOR Oct 2 2002 12:07:14:683PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Seems to be controlling

Adjust SSEP gain at shot end.
Put in negative SSEP early.
Lower ZXU gain to .2 at .2s.

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1021002016 hutch PHYSICS_OPERATOR Oct 2 2002 12:23:47:320PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Sustained upper-x point H-mode with what
look like type 3 elms. Some zcur oscillations

Set SSEP to -.01. Need to lower the factor to .00015.
Raise zxl to try to avoid oscillations.
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1021002017 hutch PHYSICS_OPERATOR Oct 2 2002 12:42:09:400PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Disrupts at 1s. Probably caused by a probe scan.
There was a first big injection at .8s when the first scan occurred.
This value of SSEP puts the upper x-point outside the vessel.
The controller does seem to maintain small error.

Set SSEP to .005
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1021002018 hutch PHYSICS_OPERATOR Oct 2 2002 12:53:50:900PM
. . . . . . . . . . . . . . . . . . . .
Plasma. EFIT declares SSEP to be 1.2cm, more than twice the request.
But quite well controlled. No MKS b-bottom data.

Repeat.

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1021002019 hutch PHYSICS_OPERATOR Oct 2 2002 1:10:50:323PM
. . . . . . . . . . . . . . . . . . . .
Fizzle. 30kA. Not clear why.

Fiddle around with the gauges because they are not working.
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1021002020 hutch PHYSICS_OPERATOR Oct 2 2002 2:10:08:530PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Gauges still screwed.

Discovered a factor ~2 problem in the SSEP predictor.
Fixed by using the flux gradient from the reference shot.
NOTE this error has existed in strkpsi and strkin since dot.
Set drawn value to 0.01 m. This ought to be practically the
same as the previous shot's .005, since the predictor values
changed by about a factor of 2.

Much fiddling with the pressure gauge's camac modules.
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1021002021 hutch PHYSICS_OPERATOR Oct 2 2002 2:29:50:600PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Add integral gain of 1 to SSEP controller.
Fiddle with the controller factor. It seems to give greater phys gain.
SSEP to .005m.
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1021002022 hutch PHYSICS_OPERATOR Oct 2 2002 3:13:49:526PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Got efit 8mm SSEP. PCS error is small. Control is working.
SSEP to -2mm.
Installed a second ssep wire to test offsets.
----------------------------------------------------------------------------
1021002023 hutch PHYSICS_OPERATOR Oct 2 2002 3:27:09:956PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Got about 4.5mm SSEP.
Wire 12 seems to show that an offset of 3000 is the wrong sign.

Put in an offset of -3000 in wire 11
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1021002024 hutch PHYSICS_OPERATOR Oct 2 2002 3:41:47:026PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Mfil thinks the SSEP is a mm or two negative.
Efit thinks it is zero.

SSEP offset to -2500.
Drawn to +.002, to give upper null.
----------------------------------------------------------------------------
1021002025 hutch PHYSICS_OPERATOR Oct 2 2002 3:53:51:090PM
. . . . . . . . . . . . . . . . . . . .
Plasma. Nice upper null as requested. EFIT says SSEP=+2.5mm

SSEP to -3mm.
----------------------------------------------------------------------------
1021002026 hutch PHYSICS_OPERATOR Oct 2 2002 4:07:27:953PM
. . . . . . . . . . . . . . . . . . . .
Fizzle.

----------------------------------------------------------------------------
1021002027 hutch PHYSICS_OPERATOR Oct 2 2002 4:27:31:036PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Fill puff to 19ms.
nl04 to .6e20.
----------------------------------------------------------------------------
1021002028 hutch PHYSICS_OPERATOR Oct 2 2002 4:34:58:626PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

nl04 to .4e20
----------------------------------------------------------------------------
1021002029 hutch PHYSICS_OPERATOR Oct 2 2002 4:48:52:726PM
. . . . . . . . . . . . . . . . . . . .
Plasma disrupts at 1.4s

nl04 to 1.2e20.
----------------------------------------------------------------------------
1021002030 hutch PHYSICS_OPERATOR Oct 2 2002 5:01:26:043PM
. . . . . . . . . . . . . . . . . . . .
Fizzle

Br offset to 1.8mT
----------------------------------------------------------------------------
1021002031 hutch PHYSICS_OPERATOR Oct 2 2002 5:05:47:393PM
. . . . . . . . . . . . . . . . . . . .
Plasma.

Session Leader Comments

Oct 2 2002 09:25:23:590AM Brian Labombard The purpose of today's experiments is to assess the
potential performance of a cryopump located in the upper
divertor for density control in H-mode discharges.
The goals are two-fold: (1) determine the range of neutral pressures
in the upper chamber for a variety of secondary separatrix locations and
(2) quantify the active deuterium inventory in the plasma, neutral gas, and walls.

We will be running a series of RF heated (2 MW) H-mode discharges (1 MA, 5.3 T)
(such as shot#1020920020) with different upper x-point programs. Pressures in the
upper chamber will be monitored with the baratron gauge at E-top (E_top_mks).
The total active gas inventory will be monitored by instrumented gas
input plenums and by operating with the pumping stack gate valves closed.

Oct 2 2002 08:33:07:200AM 1021002001 Brian Labombard Shot 1 - gas only test shot. NINJA not enabled.

Oct 2 2002 08:47:27:257AM 1021002002 Brian Labombard Shot 2 - Gas only test shot. NINJA enabled. Puff from B16-001 with small plenum.
Gas programming is NOT like 1020718007

Oct 2 2002 08:54:23:227AM 1021002003 Brian Labombard Shot 3 - Gas only test shot. NINJA enabled. Puff from B16-001 with large plenum.
MHD antenna pulsing. Fizzle detector is enabled - oops.

Oct 2 2002 09:34:01:833AM 1021002004 Brian Labombard Shot 4 - Gas only test shot. NINJA enabled. Puff from ABLim with large plenum.
DNB gate valve closed. ECE gate valve opening. Looks like we finally got the
right piezo programming. No B-side upper or lower.

B side-upper: -1 sec, 0.0 sec pulse 10 psi D2
C-side: 1 sec, 0.1 sec pulse 30 psi D2
B-Top: 3 sec, 0.5 sec pulse 6 psi D2
J-Bottom: 5 sec, 0.5 sec pulse 30 psi D2
NINJA:ABLim: 7 sec, 0.1 sec pulse 20 psi D2

Oct 2 2002 09:34:39:647AM 1021002005 Brian Labombard Shot 5 - Gas only test shot. NINJA enabled. Puff from ABLim with small plenum.
DNB gate valve closed. ECE gate valve opening.

B side-upper: -1 sec, 0.5 sec pulse 10 psi D2
C-side: 1 sec, 0.1 sec pulse 30 psi D2
B-Top: 3 sec, 0.5 sec pulse 6 psi D2
J-Bottom: 5 sec, 0.5 sec pulse 30 psi D2
NINJA:ABLim: 7 sec, 0.1 sec pulse 20 psi D2

Oct 2 2002 10:38:15:553AM 1021002009 Brian Labombard Shot 9 - Target NL04 ~ 1.0, got 4 H-Modes - they look of the ELM-free kind.
Nice RF: 1MW from D and E.
More gas in than out - wall is pumping.
SSEP around -1.6, E-top = 0.5 mtorr/ E-bottom=10 mtorr.

Next shot: reduce NL04 slightly, start turning on SSEP controls.

Oct 2 2002 11:17:14:753AM 1021002011 Brian Labombard Shot 11 - Target NL04 ~ 0.95, got 4 H-Modes - similar to shot 9
again nice RF: 1MW from D and E.
ISP scanning at 0.8, 1.0, and 1.2 seconds.
More gas in than out - wall is still pumping.
SSEP around -1.6, E-top = 0.3 mtorr/ E-bottom = 6 mtorr.

Oct 2 2002 11:36:06:757AM 1021002013 Brian Labombard Shot 13 - Disrupted at .837. BN tile in divertor glows brightly.
G-side ratiomatic was off on this shot.
Got more gas out than we put in - result of disruption.

Oct 2 2002 11:53:31:130AM 1021002014 Brian Labombard Shot 14 - Target NL04 ~ 0.9, multi H-Modes
nice RF: 1MW from D and E.
SSEP goes to zero at 0.8
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
E-top = 2 mtorr/ E-bottom = 2 mtorr when SSEP=0

Oct 2 2002 12:08:41:313PM 1021002015 Brian Labombard Shot 15 - Target NL04 ~ 0.9, multi H-Modes
nice RF: 1MW from D and E.
SSEP goes above zero at 0.7
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
E-top = 2 mtorr (going to 7 mtorr in SNU, L-mode phase)/ E-bottom = 2 mtorr

Oct 2 2002 12:22:03:893PM 1021002016 Brian Labombard Shot 16 - Target NL04 ~ 0.9, two+ H-Modes, first H-mode persists in SNU.
nice RF: 2MW
SSEP goes to +5 mm
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
E-top = 5 to 8 mtorr / E-bottom = 2 mtorr

Oct 2 2002 12:33:44:770PM 1021002017 Brian Labombard Shot 17 - Target NL04 ~ 0.9, H-mode, disrupted at 1.02 seconds - ASP killed it.
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.

Oct 2 2002 01:08:27:067PM 1021002018 Brian Labombard Shot 18 - Target NL04 ~ 0.9, multi H-modes
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at -1 cm.
G-side ratiomatic was off, problem with B-bottom MKS and CB-Div Penning signal

Next shot: repeat

Oct 2 2002 02:11:17:300PM 1021002020 Brian Labombard Shot 20 - Target NL04 ~ 0.9, multi H-modes, repeat of shot 18
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
Nice ASP data at 1.0 seconds.
SSEP controlled, flat at -1.2 cm.
=>>camac problem for gas gauge signals

Stop to swap some INCAA units in gas gauge rack.

Oct 2 2002 02:27:23:920PM 1021002021 Brian Labombard Shot 21 - Target NL04 ~ 0.8, multi H-modes
RF: 2MW
ASP scanning at 0.8, 1.0, and 1.2 seconds.
ISP not scanning.
SSEP controlled, flat at -1.3 cm.
Gas gauge signals are now working.
E-top: 0.5 to 1.0 mtorr/ E-Bottom: 5 to 7 mtorr

Next shot: go to SSEP -0.5

Oct 2 2002 02:42:31:727PM 1021002022 Brian Labombard Shot 22 - Target NL04 ~ 0.8, multi H-modes
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at -0.8 cm.
E-top: 1.7 mtorr/ E-Bottom: 7 mtorr

Next shot: go to SSEP -0.4

Oct 2 2002 02:58:43:927PM 1021002022 Brian Labombard Pausing for cell access so RF group can track down
some bad cables

Oct 2 2002 03:22:15:410PM 1021002023 Brian Labombard Shot 23 - Target NL04 ~ 0.9 prior to RF pulse, couple of H-modes
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at -0.4 cm.
E-top: 3.5 mtorr/ E-Bottom: 5 mtorr

Next shot: go to SSEP near 0

Oct 2 2002 03:49:07:047PM 1021002025 Brian Labombard Shot 25 - Target NL04 ~ 0.9, H-modes late in shot where SSEP bounces through zero
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at +0.3 cm.
E-top: 8 mtorr/ E-Bottom: 4 mtorr

Next shot: go to SSEP -0.3

Oct 2 2002 04:18:56:140PM 1021002027 Brian Labombard Shot 27 - Target NL04 ~ 1.0, late H-modes
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
very nice ASP data
SSEP controlled, flat at -0.2 cm.
E-top: 3 mtorr, down to 2 mtorr during H-mode/ E-Bottom: 4 mtorr

Next shot: go to NL04 request of 0.6

Oct 2 2002 04:32:09:653PM 1021002028 Brian Labombard Shot 28 - Target NL04 ~ 0.65, 3 H-modes
RF: 2MW, D trips
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at -0.2 cm.
E-top: 1 mtorr / E-Bottom: 2 mtorr

Next shot: go to NL04 request of 0.4

Oct 2 2002 04:42:18:280PM 1021002029 Brian Labombard Shot 29 - Target NL04 ~ 0.4, 3 H-modes, disrupts at 1.37 seconds
RF: 2MW
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at -0.2 cm.
E-top: 0.5 mtorr / E-Bottom: 1.5 mtorr

Next shot: go to NL04 request of 1.2

Oct 2 2002 05:34:25:857PM 1021002031 Brian Labombard Shot 31 - Target NL04 ~ 1.1, 3 H-modes
RF: 2MW, with trips
ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
SSEP controlled, flat at -0.2 cm.
E-top: 15 mtorr dropping to 5 mtorr / E-Bottom: 7 mtorr

Physics Operator Comments

Oct 2 2002 08:51:42:907AM Ian Hutchinson MP323 Scoping Experiments for Upper Divertor Cryopump Operation
in Unbalanced Double Null H-mode discharges.

The fluxihh code was modified yesterday to add a new predictor SSEP.
It consists of the flux difference between the positions of the nominal
upper and lower x-points, scaled to be in units of outer midplane radius,
rho.

Start PCS. Load segment 2 from 1020920020.
Install SSEP on wire 11.
Apply.
Call the predictor.
Put a small proportional gain on controller. .05=.2/s physics.
Open controller. Put the keywords to:
ALLNAMES=['PSI0','RCUR','ZCUR','CLEARIN','RXL','ZXL','RXU','SSEP']
Call. OK.
Get a pop-up to confirm the rate. It says
scaled_controller=controller(i)/rate(i)*common_rate.
Which is horribly ambiguous as well as unclear. It offers:
rate =9.19279 and says please enter the new common rate /sec.
Just ok the common rate that is present, namely 4.
OK. Seems ok except that it is lower case, implying not on.
The factor seems to have to be very small:
0.00023

Oct 2 2002 07:56:03:017AM 1021002001 Jim Irby Loaded shot 1020718007 ---- gas and gauge calibration shot

Pressure gauges and plenum readings look okay --- but will need Brian to enable Ninja

Oct 2 2002 08:44:27:217AM 1021002002 Jim Irby Brian has turned on the Ninja

We have enabled more gas puff valves --- but not j-bottom as yet

Oct 2 2002 08:53:17:630AM 1021002003 Jim Irby Reloaded 1020718007 ---- AND DID A LOAD/CLEAN

May have j-bottom this time

Still need to delay fizzle

Oct 2 2002 09:06:08:243AM 1021002004 Jim Irby Fizzle detector to 10 seconds

Looks much better --- but missed b-side-upper

take one more shot

Oct 2 2002 09:18:19:103AM 1021002005 Jim Irby enabled b-side-upper

j-bottom seems to have a problem

Oct 2 2002 09:36:14:433AM 1021002005 Ian Hutchinson Found that the ssep not becoming upper case was related to
building the segment. After having done that it becomes SSEP.

Load the SSEP controller into the model.

Oct 2 2002 09:49:13:843AM 1021002006 Ian Hutchinson First plasma attempt.
Dud. Fields look ok.

Increase gas puff to 25ms from 23ms.

Oct 2 2002 10:11:28:700AM 1021002007 Ian Hutchinson Dud. Call for 5minutes of ECDC.

Oct 2 2002 10:25:02:407AM 1021002008 Ian Hutchinson Fizzle.

Br to 1.8mT from 2.

Oct 2 2002 10:39:05:383AM 1021002009 Ian Hutchinson Plasma. SSEP phys A out reads -5000.

Insert SSEP gain of 1 at 1s.
nl04 to .9 from 1.

Oct 2 2002 10:51:54:903AM 1021002010 Ian Hutchinson Fizzle.

ICEF4 to -1315 from -1325. Br back to 2mT.
Rcur to .69 from .68 at 1ms.

Oct 2 2002 11:09:29:870AM 1021002011 Ian Hutchinson Plasma.

ZXU gain to 1 from 6 at .3s.
ICEF4 to -1320
Fill puff to 23ms.
zcur to -.01 from -.015.
rxl to -.006 from -.012 to get strike point off tile.

Oct 2 2002 11:24:59:803AM 1021002012 Ian Hutchinson Fizzle.

br to 2.2mT
Fill puff to 21ms.

Oct 2 2002 11:37:05:197AM 1021002013 Ian Hutchinson Plasma disrupts at .8s due to big injection.
Tile glows brightly.

zxl to 0.
SSEP gain step to .6s.
Install SSEP wiggle.
Br to 2mT
ICEF4 to -1325.

Oct 2 2002 11:54:36:057AM 1021002014 Ian Hutchinson Plasma. Nearly double null. Control of SSEP is not clear.

Bt to 150kA at .1 to match the segment switch.
Argon to 30ms from 40ms puff.
SSEP gain to 5.

Oct 2 2002 12:07:14:683PM 1021002015 Ian Hutchinson Plasma. Seems to be controlling

Adjust SSEP gain at shot end.
Put in negative SSEP early.
Lower ZXU gain to .2 at .2s.

Oct 2 2002 12:23:47:320PM 1021002016 Ian Hutchinson Plasma. Sustained upper-x point H-mode with what
look like type 3 elms. Some zcur oscillations

Set SSEP to -.01. Need to lower the factor to .00015.
Raise zxl to try to avoid oscillations.

Oct 2 2002 12:42:09:400PM 1021002017 Ian Hutchinson Plasma. Disrupts at 1s. Probably caused by a probe scan.
There was a first big injection at .8s when the first scan occurred.
This value of SSEP puts the upper x-point outside the vessel.
The controller does seem to maintain small error.

Set SSEP to .005

Oct 2 2002 12:53:50:900PM 1021002018 Ian Hutchinson Plasma. EFIT declares SSEP to be 1.2cm, more than twice the request.
But quite well controlled. No MKS b-bottom data.

Repeat.

Oct 2 2002 01:10:50:323PM 1021002019 Ian Hutchinson Fizzle. 30kA. Not clear why.

Fiddle around with the gauges because they are not working.

Oct 2 2002 02:10:08:530PM 1021002020 Ian Hutchinson Plasma. Gauges still screwed.

Discovered a factor ~2 problem in the SSEP predictor.
Fixed by using the flux gradient from the reference shot.
NOTE this error has existed in strkpsi and strkin since dot.
Set drawn value to 0.01 m. This ought to be practically the
same as the previous shot's .005, since the predictor values
changed by about a factor of 2.

Much fiddling with the pressure gauge's camac modules.

Oct 2 2002 02:29:50:600PM 1021002021 Ian Hutchinson Plasma.

Add integral gain of 1 to SSEP controller.
Fiddle with the controller factor. It seems to give greater phys gain.
SSEP to .005m.

Oct 2 2002 03:13:49:527PM 1021002022 Ian Hutchinson Plasma.

Got efit 8mm SSEP. PCS error is small. Control is working.
SSEP to -2mm.
Installed a second ssep wire to test offsets.

Oct 2 2002 03:27:09:957PM 1021002023 Ian Hutchinson Plasma. Got about 4.5mm SSEP.
Wire 12 seems to show that an offset of 3000 is the wrong sign.

Put in an offset of -3000 in wire 11

Oct 2 2002 03:41:47:027PM 1021002024 Ian Hutchinson Plasma. Mfil thinks the SSEP is a mm or two negative.
Efit thinks it is zero.

SSEP offset to -2500.
Drawn to +.002, to give upper null.

Oct 2 2002 03:53:51:090PM 1021002025 Ian Hutchinson Plasma. Nice upper null as requested. EFIT says SSEP=+2.5mm

SSEP to -3mm.

Oct 2 2002 04:07:27:953PM 1021002026 Ian Hutchinson Fizzle.

Oct 2 2002 04:27:31:037PM 1021002027 Ian Hutchinson Plasma.

Fill puff to 19ms.
nl04 to .6e20.

Oct 2 2002 04:34:58:627PM 1021002028 Ian Hutchinson Plasma.

nl04 to .4e20

Oct 2 2002 04:48:52:727PM 1021002029 Ian Hutchinson Plasma disrupts at 1.4s

nl04 to 1.2e20.

Oct 2 2002 05:01:26:043PM 1021002030 Ian Hutchinson Fizzle

Br offset to 1.8mT

Oct 2 2002 05:05:47:393PM 1021002031 Ian Hutchinson Plasma.

Engineering Operator Comments

Shot Time Type Status Comment

1 07:45:36:427AM Test Ok Cycle and Gas System Test

2 08:33:20:920AM Test Ok Cycle and Gas Test

3 08:47:02:927AM Test Ok Cycle and Gas Test

4 08:56:52:047AM Test Ok Cycle and Gas Test

5 09:09:43:393AM Test Ok Cycle and Gas Tests

6 09:36:52:013AM Plasma Ok

7 09:50:20:630AM Plasma Ok

8 10:09:52:727AM Plasma Ok

9 10:22:50:917AM Plasma Ok

10 10:37:30:537AM Plasma Ok

11 10:50:23:913AM Plasma Ok

12 11:05:30:157AM Plasma Ok

13 11:18:24:160AM Plasma Ok

14 11:36:13:333AM Plasma Ok

15 11:52:52:660AM Plasma Ok

16 12:06:21:290PM Plasma Ok

17 12:22:10:253PM Plasma Ok

18 12:38:11:017PM Plasma Ok

19 12:51:15:800PM Plasma Ok

20 01:08:29:380PM Plasma Ok

21 02:08:36:807PM Plasma Ok

22 02:27:24:043PM Plasma Ok

23 03:09:11:343PM Plasma Ok

24 03:22:45:427PM Plasma Ok

25 03:38:25:283PM Plasma Ok

26 03:51:33:520PM Plasma Ok

27 04:04:42:320PM Plasma Ok

28 04:18:40:813PM Plasma Ok

29 04:32:39:903PM Plasma Ok

30 04:46:33:613PM Plasma Ok

31 04:59:42:430PM Plasma Ok

Session Leader Comments
Oct 2 2002 09:25:23:590AM		Brian Labombard	The purpose of today's experiments is to assess the potential performance of a cryopump located in the upper divertor for density control in H-mode discharges. The goals are two-fold: (1) determine the range of neutral pressures in the upper chamber for a variety of secondary separatrix locations and (2) quantify the active deuterium inventory in the plasma, neutral gas, and walls. We will be running a series of RF heated (2 MW) H-mode discharges (1 MA, 5.3 T) (such as shot#1020920020) with different upper x-point programs. Pressures in the upper chamber will be monitored with the baratron gauge at E-top (E_top_mks). The total active gas inventory will be monitored by instrumented gas input plenums and by operating with the pumping stack gate valves closed.
Oct 2 2002 08:33:07:200AM	1021002001	Brian Labombard	Shot 1 - gas only test shot. NINJA not enabled.
Oct 2 2002 08:47:27:257AM	1021002002	Brian Labombard	Shot 2 - Gas only test shot. NINJA enabled. Puff from B16-001 with small plenum. Gas programming is NOT like 1020718007
Oct 2 2002 08:54:23:227AM	1021002003	Brian Labombard	Shot 3 - Gas only test shot. NINJA enabled. Puff from B16-001 with large plenum. MHD antenna pulsing. Fizzle detector is enabled - oops.
Oct 2 2002 09:34:01:833AM	1021002004	Brian Labombard	Shot 4 - Gas only test shot. NINJA enabled. Puff from ABLim with large plenum. DNB gate valve closed. ECE gate valve opening. Looks like we finally got the right piezo programming. No B-side upper or lower. B side-upper: -1 sec, 0.0 sec pulse 10 psi D2 C-side: 1 sec, 0.1 sec pulse 30 psi D2 B-Top: 3 sec, 0.5 sec pulse 6 psi D2 J-Bottom: 5 sec, 0.5 sec pulse 30 psi D2 NINJA:ABLim: 7 sec, 0.1 sec pulse 20 psi D2
Oct 2 2002 09:34:39:647AM	1021002005	Brian Labombard	Shot 5 - Gas only test shot. NINJA enabled. Puff from ABLim with small plenum. DNB gate valve closed. ECE gate valve opening. B side-upper: -1 sec, 0.5 sec pulse 10 psi D2 C-side: 1 sec, 0.1 sec pulse 30 psi D2 B-Top: 3 sec, 0.5 sec pulse 6 psi D2 J-Bottom: 5 sec, 0.5 sec pulse 30 psi D2 NINJA:ABLim: 7 sec, 0.1 sec pulse 20 psi D2
Oct 2 2002 10:38:15:553AM	1021002009	Brian Labombard	Shot 9 - Target NL04 ~ 1.0, got 4 H-Modes - they look of the ELM-free kind. Nice RF: 1MW from D and E. More gas in than out - wall is pumping. SSEP around -1.6, E-top = 0.5 mtorr/ E-bottom=10 mtorr. Next shot: reduce NL04 slightly, start turning on SSEP controls.
Oct 2 2002 11:17:14:753AM	1021002011	Brian Labombard	Shot 11 - Target NL04 ~ 0.95, got 4 H-Modes - similar to shot 9 again nice RF: 1MW from D and E. ISP scanning at 0.8, 1.0, and 1.2 seconds. More gas in than out - wall is still pumping. SSEP around -1.6, E-top = 0.3 mtorr/ E-bottom = 6 mtorr.
Oct 2 2002 11:36:06:757AM	1021002013	Brian Labombard	Shot 13 - Disrupted at .837. BN tile in divertor glows brightly. G-side ratiomatic was off on this shot. Got more gas out than we put in - result of disruption.
Oct 2 2002 11:53:31:130AM	1021002014	Brian Labombard	Shot 14 - Target NL04 ~ 0.9, multi H-Modes nice RF: 1MW from D and E. SSEP goes to zero at 0.8 ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds. E-top = 2 mtorr/ E-bottom = 2 mtorr when SSEP=0
Oct 2 2002 12:08:41:313PM	1021002015	Brian Labombard	Shot 15 - Target NL04 ~ 0.9, multi H-Modes nice RF: 1MW from D and E. SSEP goes above zero at 0.7 ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds. E-top = 2 mtorr (going to 7 mtorr in SNU, L-mode phase)/ E-bottom = 2 mtorr
Oct 2 2002 12:22:03:893PM	1021002016	Brian Labombard	Shot 16 - Target NL04 ~ 0.9, two+ H-Modes, first H-mode persists in SNU. nice RF: 2MW SSEP goes to +5 mm ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds. E-top = 5 to 8 mtorr / E-bottom = 2 mtorr
Oct 2 2002 12:33:44:770PM	1021002017	Brian Labombard	Shot 17 - Target NL04 ~ 0.9, H-mode, disrupted at 1.02 seconds - ASP killed it. RF: 2MW ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds.
Oct 2 2002 01:08:27:067PM	1021002018	Brian Labombard	Shot 18 - Target NL04 ~ 0.9, multi H-modes RF: 2MW ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds. SSEP controlled, flat at -1 cm. G-side ratiomatic was off, problem with B-bottom MKS and CB-Div Penning signal Next shot: repeat
Oct 2 2002 02:11:17:300PM	1021002020	Brian Labombard	Shot 20 - Target NL04 ~ 0.9, multi H-modes, repeat of shot 18 RF: 2MW ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds. Nice ASP data at 1.0 seconds. SSEP controlled, flat at -1.2 cm. =>>camac problem for gas gauge signals Stop to swap some INCAA units in gas gauge rack.
Oct 2 2002 02:27:23:920PM	1021002021	Brian Labombard	Shot 21 - Target NL04 ~ 0.8, multi H-modes RF: 2MW ASP scanning at 0.8, 1.0, and 1.2 seconds. ISP not scanning. SSEP controlled, flat at -1.3 cm. Gas gauge signals are now working. E-top: 0.5 to 1.0 mtorr/ E-Bottom: 5 to 7 mtorr Next shot: go to SSEP -0.5
Oct 2 2002 02:42:31:727PM	1021002022	Brian Labombard	Shot 22 - Target NL04 ~ 0.8, multi H-modes RF: 2MW ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds. SSEP controlled, flat at -0.8 cm. E-top: 1.7 mtorr/ E-Bottom: 7 mtorr Next shot: go to SSEP -0.4
Oct 2 2002 02:58:43:927PM	1021002022	Brian Labombard	Pausing for cell access so RF group can track down some bad cables
Oct 2 2002 03:22:15:410PM	1021002023	Brian Labombard	Shot 23 - Target NL04 ~ 0.9 prior to RF pulse, couple of H-modes RF: 2MW ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds. SSEP controlled, flat at -0.4 cm. E-top: 3.5 mtorr/ E-Bottom: 5 mtorr Next shot: go to SSEP near 0
Oct 2 2002 03:49:07:047PM	1021002025	Brian Labombard	Shot 25 - Target NL04 ~ 0.9, H-modes late in shot where SSEP bounces through zero RF: 2MW ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds. SSEP controlled, flat at +0.3 cm. E-top: 8 mtorr/ E-Bottom: 4 mtorr Next shot: go to SSEP -0.3
Oct 2 2002 04:18:56:140PM	1021002027	Brian Labombard	Shot 27 - Target NL04 ~ 1.0, late H-modes RF: 2MW ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds. very nice ASP data SSEP controlled, flat at -0.2 cm. E-top: 3 mtorr, down to 2 mtorr during H-mode/ E-Bottom: 4 mtorr Next shot: go to NL04 request of 0.6
Oct 2 2002 04:32:09:653PM	1021002028	Brian Labombard	Shot 28 - Target NL04 ~ 0.65, 3 H-modes RF: 2MW, D trips ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds. SSEP controlled, flat at -0.2 cm. E-top: 1 mtorr / E-Bottom: 2 mtorr Next shot: go to NL04 request of 0.4
Oct 2 2002 04:42:18:280PM	1021002029	Brian Labombard	Shot 29 - Target NL04 ~ 0.4, 3 H-modes, disrupts at 1.37 seconds RF: 2MW ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds. SSEP controlled, flat at -0.2 cm. E-top: 0.5 mtorr / E-Bottom: 1.5 mtorr Next shot: go to NL04 request of 1.2
Oct 2 2002 05:34:25:857PM	1021002031	Brian Labombard	Shot 31 - Target NL04 ~ 1.1, 3 H-modes RF: 2MW, with trips ISP and ASP scanning at 0.8, 1.0, and 1.2 seconds. SSEP controlled, flat at -0.2 cm. E-top: 15 mtorr dropping to 5 mtorr / E-Bottom: 7 mtorr

Physics Operator Comments
Oct 2 2002 08:51:42:907AM		Ian Hutchinson	MP323 Scoping Experiments for Upper Divertor Cryopump Operation in Unbalanced Double Null H-mode discharges. The fluxihh code was modified yesterday to add a new predictor SSEP. It consists of the flux difference between the positions of the nominal upper and lower x-points, scaled to be in units of outer midplane radius, rho. Start PCS. Load segment 2 from 1020920020. Install SSEP on wire 11. Apply. Call the predictor. Put a small proportional gain on controller. .05=.2/s physics. Open controller. Put the keywords to: ALLNAMES=['PSI0','RCUR','ZCUR','CLEARIN','RXL','ZXL','RXU','SSEP'] Call. OK. Get a pop-up to confirm the rate. It says scaled_controller=controller(i)/rate(i)*common_rate. Which is horribly ambiguous as well as unclear. It offers: rate =9.19279 and says please enter the new common rate /sec. Just ok the common rate that is present, namely 4. OK. Seems ok except that it is lower case, implying not on. The factor seems to have to be very small: 0.00023
Oct 2 2002 07:56:03:017AM	1021002001	Jim Irby	Loaded shot 1020718007 ---- gas and gauge calibration shot Pressure gauges and plenum readings look okay --- but will need Brian to enable Ninja
Oct 2 2002 08:44:27:217AM	1021002002	Jim Irby	Brian has turned on the Ninja We have enabled more gas puff valves --- but not j-bottom as yet
Oct 2 2002 08:53:17:630AM	1021002003	Jim Irby	Reloaded 1020718007 ---- AND DID A LOAD/CLEAN May have j-bottom this time Still need to delay fizzle
Oct 2 2002 09:06:08:243AM	1021002004	Jim Irby	Fizzle detector to 10 seconds Looks much better --- but missed b-side-upper take one more shot
Oct 2 2002 09:18:19:103AM	1021002005	Jim Irby	enabled b-side-upper j-bottom seems to have a problem
Oct 2 2002 09:36:14:433AM	1021002005	Ian Hutchinson	Found that the ssep not becoming upper case was related to building the segment. After having done that it becomes SSEP. Load the SSEP controller into the model.
Oct 2 2002 09:49:13:843AM	1021002006	Ian Hutchinson	First plasma attempt. Dud. Fields look ok. Increase gas puff to 25ms from 23ms.
Oct 2 2002 10:11:28:700AM	1021002007	Ian Hutchinson	Dud. Call for 5minutes of ECDC.
Oct 2 2002 10:25:02:407AM	1021002008	Ian Hutchinson	Fizzle. Br to 1.8mT from 2.
Oct 2 2002 10:39:05:383AM	1021002009	Ian Hutchinson	Plasma. SSEP phys A out reads -5000. Insert SSEP gain of 1 at 1s. nl04 to .9 from 1.
Oct 2 2002 10:51:54:903AM	1021002010	Ian Hutchinson	Fizzle. ICEF4 to -1315 from -1325. Br back to 2mT. Rcur to .69 from .68 at 1ms.
Oct 2 2002 11:09:29:870AM	1021002011	Ian Hutchinson	Plasma. ZXU gain to 1 from 6 at .3s. ICEF4 to -1320 Fill puff to 23ms. zcur to -.01 from -.015. rxl to -.006 from -.012 to get strike point off tile.
Oct 2 2002 11:24:59:803AM	1021002012	Ian Hutchinson	Fizzle. br to 2.2mT Fill puff to 21ms.
Oct 2 2002 11:37:05:197AM	1021002013	Ian Hutchinson	Plasma disrupts at .8s due to big injection. Tile glows brightly. zxl to 0. SSEP gain step to .6s. Install SSEP wiggle. Br to 2mT ICEF4 to -1325.
Oct 2 2002 11:54:36:057AM	1021002014	Ian Hutchinson	Plasma. Nearly double null. Control of SSEP is not clear. Bt to 150kA at .1 to match the segment switch. Argon to 30ms from 40ms puff. SSEP gain to 5.
Oct 2 2002 12:07:14:683PM	1021002015	Ian Hutchinson	Plasma. Seems to be controlling Adjust SSEP gain at shot end. Put in negative SSEP early. Lower ZXU gain to .2 at .2s.
Oct 2 2002 12:23:47:320PM	1021002016	Ian Hutchinson	Plasma. Sustained upper-x point H-mode with what look like type 3 elms. Some zcur oscillations Set SSEP to -.01. Need to lower the factor to .00015. Raise zxl to try to avoid oscillations.
Oct 2 2002 12:42:09:400PM	1021002017	Ian Hutchinson	Plasma. Disrupts at 1s. Probably caused by a probe scan. There was a first big injection at .8s when the first scan occurred. This value of SSEP puts the upper x-point outside the vessel. The controller does seem to maintain small error. Set SSEP to .005
Oct 2 2002 12:53:50:900PM	1021002018	Ian Hutchinson	Plasma. EFIT declares SSEP to be 1.2cm, more than twice the request. But quite well controlled. No MKS b-bottom data. Repeat.
Oct 2 2002 01:10:50:323PM	1021002019	Ian Hutchinson	Fizzle. 30kA. Not clear why. Fiddle around with the gauges because they are not working.
Oct 2 2002 02:10:08:530PM	1021002020	Ian Hutchinson	Plasma. Gauges still screwed. Discovered a factor ~2 problem in the SSEP predictor. Fixed by using the flux gradient from the reference shot. NOTE this error has existed in strkpsi and strkin since dot. Set drawn value to 0.01 m. This ought to be practically the same as the previous shot's .005, since the predictor values changed by about a factor of 2. Much fiddling with the pressure gauge's camac modules.
Oct 2 2002 02:29:50:600PM	1021002021	Ian Hutchinson	Plasma. Add integral gain of 1 to SSEP controller. Fiddle with the controller factor. It seems to give greater phys gain. SSEP to .005m.
Oct 2 2002 03:13:49:527PM	1021002022	Ian Hutchinson	Plasma. Got efit 8mm SSEP. PCS error is small. Control is working. SSEP to -2mm. Installed a second ssep wire to test offsets.
Oct 2 2002 03:27:09:957PM	1021002023	Ian Hutchinson	Plasma. Got about 4.5mm SSEP. Wire 12 seems to show that an offset of 3000 is the wrong sign. Put in an offset of -3000 in wire 11
Oct 2 2002 03:41:47:027PM	1021002024	Ian Hutchinson	Plasma. Mfil thinks the SSEP is a mm or two negative. Efit thinks it is zero. SSEP offset to -2500. Drawn to +.002, to give upper null.
Oct 2 2002 03:53:51:090PM	1021002025	Ian Hutchinson	Plasma. Nice upper null as requested. EFIT says SSEP=+2.5mm SSEP to -3mm.
Oct 2 2002 04:07:27:953PM	1021002026	Ian Hutchinson	Fizzle.
Oct 2 2002 04:27:31:037PM	1021002027	Ian Hutchinson	Plasma. Fill puff to 19ms. nl04 to .6e20.
Oct 2 2002 04:34:58:627PM	1021002028	Ian Hutchinson	Plasma. nl04 to .4e20
Oct 2 2002 04:48:52:727PM	1021002029	Ian Hutchinson	Plasma disrupts at 1.4s nl04 to 1.2e20.
Oct 2 2002 05:01:26:043PM	1021002030	Ian Hutchinson	Fizzle Br offset to 1.8mT
Oct 2 2002 05:05:47:393PM	1021002031	Ian Hutchinson	Plasma.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	07:45:36:427AM	Test	Ok	Cycle and Gas System Test
2	08:33:20:920AM	Test	Ok	Cycle and Gas Test
3	08:47:02:927AM	Test	Ok	Cycle and Gas Test
4	08:56:52:047AM	Test	Ok	Cycle and Gas Test
5	09:09:43:393AM	Test	Ok	Cycle and Gas Tests
6	09:36:52:013AM	Plasma	Ok
7	09:50:20:630AM	Plasma	Ok
8	10:09:52:727AM	Plasma	Ok
9	10:22:50:917AM	Plasma	Ok
10	10:37:30:537AM	Plasma	Ok
11	10:50:23:913AM	Plasma	Ok
12	11:05:30:157AM	Plasma	Ok
13	11:18:24:160AM	Plasma	Ok
14	11:36:13:333AM	Plasma	Ok
15	11:52:52:660AM	Plasma	Ok
16	12:06:21:290PM	Plasma	Ok
17	12:22:10:253PM	Plasma	Ok
18	12:38:11:017PM	Plasma	Ok
19	12:51:15:800PM	Plasma	Ok
20	01:08:29:380PM	Plasma	Ok
21	02:08:36:807PM	Plasma	Ok
22	02:27:24:043PM	Plasma	Ok
23	03:09:11:343PM	Plasma	Ok
24	03:22:45:427PM	Plasma	Ok
25	03:38:25:283PM	Plasma	Ok
26	03:51:33:520PM	Plasma	Ok
27	04:04:42:320PM	Plasma	Ok
28	04:18:40:813PM	Plasma	Ok
29	04:32:39:903PM	Plasma	Ok
30	04:46:33:613PM	Plasma	Ok
31	04:59:42:430PM	Plasma	Ok