Alcator C-Mod Run 951218 Information

Miniproposals

Miniproposal:

Date Filed:

Title:

First Author:

Session Leader: Jeff Schachter (shots 1-34)

Operators
Session leader(s):	Jeff Schachter
Physics operator(s):	John Goetz
Engineering operator(s):	Vinny Bertolino,Joe Daigle

Engineering Operator Run Comment
goetz

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:14:850PM

Author: To Be Determined

Run Summary for MP 122A - Rho-Star Scaling - Jeff Schachter
==========================================

Overall, a good day - we were 30 for 30 on shots required. We ran the
following fields:

Field Shots
------ ------
2.6 003-017, 022
3.5 018-021,023,024
5.3 025-032

Please see the logbook under the topic SESSION_LEADER for shot to shot details.
(Note that the NUSTAR result quoted is not in the correct units.)

We ran 1.5 s flattops for shots 007-024. Breakdown was at 4.8 T, and the TF
was ramped down to the appropriate field value. The portion of the lower field
flat top that is usable in the rho-star analysis usually began around 0.78 s
and lasted until 1.5 s.

Rf was used in the 5.3 T shots starting at shot 027.

The digitization rate on the Visible Brem. Array was changed from its usual
setting for shots 008-020. Either this screwed up the data itself, or Earl's
analysis program choked, but the data needs to be looked at. We changed the
rate back for shot 021. Shot 022 was a rerun of shot 012 to get a Zeff
measurement.

YAG data is bogus for shots 027-032. This could be a problem, since I was
using the YAG Te0 to gauge the goodness of the shot for rho-star scaling.
Fortunately, this was at 5.3 T, so we have ECE data. I need to go back and
verify that the shots marked as good will indeed be useful.

4 different parameter ranges were obtained at 2.6 T - only one of which will be
possible to obtain at 8.0 T (group 1). Here are the shot groupings for today's
run (only shots that have good parameters are listed):

GROUP 1 Ip (kA) Nel20 Te (keV) RF Power (kW)
======= ======= ===== ======= ========
2.6 T: 011, 012, 014, 022 300 0.45 0.95 0
3.5 T: 020, 021 410 0.65 1.05 0
5.3 T: 030, 031 615 1.15 1.5 800 (must check)

GROUP 2
=======
2.6 T: 009, 010 350 0.53 0.93 0
3.5 T: 018, 019 470 0.79 1.15 0

GROUP 3
=======
2.6 T: 016 400 0.40 0.85 0
3.5 T: 023, 024 525 0.7 1.0

GROUP 4
=======
2.6 T: 017 400 0.6 1.2 0

We may need to rerun the group 1 5.3 T shots, depending on how well the ECE
Te's do in the first group. We also need 5.3 T shots for groups 2-4, and 8.0 T
shots for group 1. Therefore another run would be nice.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:55:647PM

Author: To Be Determined

Physics operator summary for 951218

EO: Bertolino/Daigle
PO: Goetz
SL: Schachter

Run 951218 was in support of Mini-Proposal #122A - Rho-star Scaling.
The goal of this run is to obtain a set of plasmas at 2.6T, 3.5T,
5.3T and 8.0T that are suitable for rho-star scaling analysis.

Program for this run:
- Set up a diverted shot with: Ip Bt ne20 heating
.35 2.6 .43 OH
.48 3.5 .65 OH
.73 5.3 1.1 ICRF
1.1 8.0 2.0 ICRF
- Make plasmas with dimensionless parameters (except rho-star)
as similar as possible.

See the session leader's summary for a report on this program.

Some things discovered today:
1) Very reliable startup today. Very good current rises and low impurity
levels. There was a string of 30 straight shots. This string was
interrupted by a 'strong' fizzle, which was the fiducial shot. The
Br offset change was not in the shot loaded.
2) Breakdowns were obtained at values of the toroidal field from 4.8 to
5.4T. The only knob touched for these was the TF current. Fill
pressure was approximately 2.0e-5 in nitrogen units. Impurity levels
during current rise were low.
3) Hybrid control of the TF current worked well, no problems were
encountered. The scale factor is 28kA of TF current gives 1T.
4) The controllers are not really orthogonal. Much care was needed to
keep the gaps the same shot-to-shot as the current was changed. Also,
there seems to be a 0.1e20 offset on NL04 - drawing 0.5e20 results in
0.6e20.
5) Pulse lengths were extended to 1.5sec for the 2.6T and the 3.5T
discharges. A pulse length of 1.2sec was used for the 5.3T discharges.
Disruptions were occurring @ ~1.65sec, not much time was spent
investigating the cause as the disruptions were relatively benign.

Engineering, computing, and diagnostics today: Engineering tests were
performed on shots 001 and 002 to check the OH coax resistances.
Troubles with the YAG after shot 026. Some CAMAC errors today,
but not many.

Scorecard: 34 shots = 31 plasmas + 1 fizzles + 2 tests

Shot summary for Run 951218:

Load 951212015
TF current waveform = -150 on [-1.5,+.019]; -73 on [+.02,1.1]; 0
switch closing times: EF1's @ 0.1 and OH's @ 0.12
V_OH1 spike = 250V @ 0.12; reduce to 100V from there on
IP = -350000kA
NL04 = 0.5e20
remove RF loading feedback from RCUR
coldstart hybrid - all matrices respond

Shot change result
____ _____ ______
1 eng. test shot for OH no CAMAC

2 eng. test shot for OH resistances o.k.

3 see above plasma - disr. @ 1.28; Ip=0.35MA;
Bt=2.8T; NL04=0.6e20

4 remove 6kA from TF; draw plasma - disr. @ 1.24; Bt=2.6T; Ip=0.35
NL04=0.4e20; PG3=30V NL04=0.5e20; o.gap decreasing

5 TF=-138 @ breakdown; RCUR plasma - disr. @ 1.23; Bt=2.6T @ 0.75s
ramped out to 0.675m; 1/2 hr density drooping a bit; o.gap o.k.;
wait to cool Michelson i.gap growing

6 TF current = -133kA; more early plasma - disr. @ 1.21; Bt=2.6T@0.70s
gas; extend PG3 to 1sec; remove
CLEARIN ramp - const. @ -.005

7 extend all P's, V's, and gains plasma - disr. @ 1.57; Ip drooping
to 1.5sec strikes moving up the plates

8 extend EF2 and OH2 waveforms; plasma - disr. @ 1.58;
4msec Ar; IC_EF4 gain to 3

9 RCUR = 0.68; lower Marmar puff plasma - disr. @ 1.63; o.gap=1.4cm;
i.gap=2.0cm

10 remove Marmar puff; CLEARIN = plasma - disr. @ 1.67; i.gap=1.8cm
-.008; hold out RXL longer

11 IP=-300000; NL04=0.3e20 plasma - disr. @ 1.66; nice shot

12 early gas to combat Mo influx plasma - disr. @ 1.64; NL04=0.45e20

13 PG3=28V; RXL constant thru shot plasma - disr. @ 0.74; cause!?!?!

14 no changes plasma - disr. @ 1.54; RF causes a
droop in current @ 1.46

15 IP = -400000 plasma - disr. @ 0.65; no explanation

16 no changes plasma - disr. @ 1.52; o.gap=1.0cm

17 NL04=0.5e20 plasma - disr. @ 1.64; NL04=0.69e20

18 IP=-500000 @ .122 then ramp plasma - disr. @ 1.67; current drooping;
to -470000; TF curr = 98kA; density too low; small gaps
NL04=0.69e20

19 TF current = 94kA; NL04=0.72e20 plasma - disr. @ 1.68; acceptable shot
slight ramp in IP; RCUR=0.673;
CLEARIN=-.008

20 IP=-410000; NL04=0.57e20; plasma - disr. @ 1.69; not quite right
RCUR=0.675; CLEARIN=-.009

21 NL04=0.58e20; RCUR=0.676; plasma - disr. @ 1.68; NL04=0.67e20
CLEARIN=-.007

22 reload 951218012 plasma - disr. @ 1.56; looks o.k.

23 reload 951218021; IP=-530000; plasma - disr. @ 1.25; plasma retching
NL04=0.83e20 like a jackal @ 0.92sec; o.gap=0.9cm

24 RCUR=0.673 plasma - disr. @ 1.67; unacceptable -
no YAG

25 rampdown@1.2; IP=-615000; plasma - disr. @ 1.47; Ip droops; 5.4T;
NL04=1.15e20; TF curr = -148 NL04=1.1e20 barely
(5.3T); PG3 off at 1.2sec

26 TF current = -145kA; IP ramp plasma - disr. @ 1.52; Ip o.k.; Bt o.k.;
to -630kA; PG3=34V; RCUR=0.67; density not there yet
CLEARIN=-.005

27 PG3 = 37V and 50V early in 2 plasma - disr. @ 1.50; density flat but
only 1.0->1.1

28 PG3=41V and NL04=1.25e20 plasma - disr. @ 1.46; NL04=1.1 -> 1.2

29 more PG3 between 0.2 and 0.5 plasma - disr. @ 1.44; density o.k.

30 a bit more RF power plasma - disr. @ 1.46; almost a good
match to previous dimensionless params.

31 a bit more RF power plasma - disr. @ 1.45; good match to
previous dimensionless params.

32 IP=-715000; NL04=1.42e20; plasma - disr. @ 1.47; not much right
PG3=46V for scaling purposes

33 load 951212017 for fiducial fizzle -strong - too much Br

34 Br offset = .0064 acceptable fiducial

Session Leader Comments

Dec 18 1995 09:55:54:200AM 951218003 Jeff Schachter Shot: 951218003 Time: 0.900000 Window: 0.100000
Bt = 2.80 T Ip = 0.35 MA Nel20 = 0.60 Te = 1.03 keV Pin = 0.40 MW
a = 20.6671 Zeff = 1.42

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.323571 0.545077 0.984456 0.342116
3.50000 0.435577 0.810185 1.20022 0.619959
5.30000 0.659588 1.40884 1.58270 1.42160
8.00000 0.995604 2.43938 2.08261 3.23897

RHOSTAR: 0.0175949 NUSTAR: 16.4638 BETAP: 0.0793794

Field ~ 2.8 T and not steady. Try for lower field (2.6) and longer,
steadier flattop. Lower density too (though this one is ok.)

Dec 18 1995 09:54:07:970AM 951218004 Jeff Schachter Shot: 951218004 Time: 0.925000 Window: 0.0750000
Bt = 2.58 T Ip = 0.35 MA Nel20 = 0.48 Te = 1.16 keV Pin = 0.39 MW
a = 20.5229 Zeff = 1.66

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.350712 0.487963 1.17164 0.398694
3.50000 0.472113 0.725292 1.42843 0.722486
5.30000 0.714913 1.26122 1.88364 1.65670
8.00000 1.07911 2.18378 2.47860 3.77462

RHOSTAR: 0.0204102 NUSTAR: 12.1200 BETAP: 0.0845737

Better shot - try to lengthen flat top at 2.6 and increase a. Looks
like we have a reasonable window in density and current.

Dec 18 1995 10:16:08:480AM 951218005 Jeff Schachter Shot: 951218005 Time: 0.900000 Window: 0.100000
Bt = 2.58 T Ip = 0.35 MA Nel20 = 0.50 Te = 1.04 keV Pin = 0.41 MW
a = 20.9525 Zeff = 1.70

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.349241 0.504499 1.04510 0.422236
3.50000 0.470132 0.749872 1.27415 0.765147
5.30000 0.711914 1.30396 1.68020 1.75453
8.00000 1.07459 2.25779 2.21090 3.99750

RHOSTAR: 0.0188841 NUSTAR: 16.4728 BETAP: 0.0779960

Flat top could be longer. Left gap ok, fix right gap. Input power may be
too high at 8.0, but thats ok.

Dec 18 1995 10:27:18:400AM 951218006 Jeff Schachter Shot: 951218006 Time: 0.890000 Window: 0.110000
Bt = 2.57 T Ip = 0.35 MA Nel20 = 0.51 Te = 0.99 keV Pin = 0.45 MW
a = 21.0785 Zeff = 1.69

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.348917 0.516892 0.996062 0.454911
3.50000 0.469696 0.768292 1.21437 0.824357
5.30000 0.711255 1.33599 1.60136 1.89030
8.00000 1.07359 2.31325 2.10716 4.30685

RHOSTAR: 0.0183398 NUSTAR: 18.5620 BETAP: 0.0761622

Much better flat top - longer, and density more constant. Try for even
longer - by extending pulse past 1.0 s.

Dec 18 1995 11:02:35:190AM 951218007 Jeff Schachter Beautiful flattop - nice and long. Will rerun to get Ti profiles from
Hirex.

EFIT problem - will need to be rerun.

Dec 18 1995 11:03:17:890AM 951218007 Jeff Schachter Beautiful flattop - nice and long. Will rerun to get Ti profiles from
Hirex.

EFIT problem - will need to be rerun.

Dec 18 1995 11:03:19:780AM 951218007 Jeff Schachter Beautiful flattop - nice and long. Will rerun to get Ti profiles from
Hirex.

EFIT problem - will need to be rerun.

Dec 18 1995 11:17:13:030AM 951218007 Jeff Schachter Shot: 951218007 Time: 1.15000 Window: 0.350000
Bt = 2.57 T Ip = 0.34 MA Nel20 = 0.51 Te = 0.98 keV Pin = 0.43 MW
a = 20.9818 Zeff = 1.53

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.341173 0.517928 0.989604 0.437436
3.50000 0.459272 0.769831 1.20649 0.792690
5.30000 0.695469 1.33867 1.59097 1.81769
8.00000 1.04976 2.31788 2.09350 4.14140

RHOSTAR: 0.0183803 NUSTAR: 16.9448 BETAP: 0.0758200

Dec 18 1995 11:04:27:040AM 951218008 Jeff Schachter Another beautiful flattop - nice and long.
Magnetics problem - can't get EFIT data for this shot.
Outer gap is ~ 2.4 cm, should be ~ 1.5 cm.

Dec 18 1995 11:30:22:320AM 951218009 Jeff Schachter Gaps better. Triangularity not constant. Nice flat top otherwise.

Zeff screwed up. Will fix for next shot. Assuming Zeff=1.5...

Shot: 951218009 Time: 1.15000 Window: 0.350000
Bt = 2.57 T Ip = 0.35 MA Nel20 = 0.53 Te = 0.93 keV Pin = 0.47 MW
a = 21.5114 Zeff = 1.50

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.349773 0.537217 0.933991 0.478409
3.50000 0.470848 0.798502 1.13869 0.866939
5.30000 0.712998 1.38852 1.50157 1.98794
8.00000 1.07622 2.40421 1.97585 4.52931

RHOSTAR: 0.0174154 NUSTAR: 19.8712 BETAP: 0.0742242

Dec 18 1995 11:45:10:890AM 951218010 Jeff Schachter More zeff problems. Otherwise good.

Shot: 951218010 Time: 1.15000 Window: 0.350000
Bt = 2.57 T Ip = 0.35 MA Nel20 = 0.52 Te = 0.91 keV Pin = 0.46 MW
a = 21.7278 Zeff = 1.50

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.349900 0.528215 0.921725 0.474091
3.50000 0.471019 0.785121 1.12374 0.859114
5.30000 0.713257 1.36526 1.48185 1.97000
8.00000 1.07661 2.36392 1.94990 4.48843

RHOSTAR: 0.0171229 NUSTAR: 20.2636 BETAP: 0.0720220

Next shot: down to nel=0.4, Ip=300.

Dec 18 1995 11:56:50:890AM 951218011 Jeff Schachter Nice flat top. Got 305 kA and nel=0.42. Power scales to 3.5 MW.
Still guessing Zeff (problems).

Shot: 951218011 Time: 1.15000 Window: 0.350000
Bt = 2.57 T Ip = 0.30 MA Nel20 = 0.42 Te = 1.01 keV Pin = 0.37 MW
a = 21.7498 Zeff = 1.50

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.307599 0.428768 1.01587 0.375287
3.50000 0.414076 0.637307 1.23851 0.680069
5.30000 0.627029 1.10822 1.63320 1.55944
8.00000 0.946459 1.91887 2.14906 3.55301

RHOSTAR: 0.0179464 NUSTAR: 13.5549 BETAP: 0.0644336

Dec 18 1995 12:08:57:930PM 951218012 Jeff Schachter density a bit higher, gap off by a few mm. Try again for Hirex.

Shot: 951218012 Time: 1.15000 Window: 0.350000
Bt = 2.57 T Ip = 0.30 MA Nel20 = 0.44 Te = 0.94 keV Pin = 0.40 MW
a = 21.3118 Zeff = 1.50

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.301872 0.446125 0.950190 0.409576
3.50000 0.406366 0.663106 1.15844 0.742205
5.30000 0.615354 1.15308 1.52761 1.70192
8.00000 0.928836 1.99654 2.01012 3.87764

RHOSTAR: 0.0177251 NUSTAR: 15.7960 BETAP: 0.0627077

Dec 18 1995 12:16:13:890PM 951218013 Jeff Schachter Disruption at 0.75 s.

Dec 18 1995 12:28:07:610PM 951218014 Jeff Schachter Nice... use with 12.

Shot: 951218014 Time: 1.15000 Window: 0.350000
Bt = 2.57 T Ip = 0.30 MA Nel20 = 0.43 Te = 1.04 keV Pin = 0.37 MW
a = 21.5851 Zeff = 1.50

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.304580 0.434974 1.04773 0.379031
3.50000 0.410012 0.646532 1.27736 0.686853
5.30000 0.620875 1.12426 1.68443 1.57500
8.00000 0.937170 1.94664 2.21647 3.58846

RHOSTAR: 0.0183879 NUSTAR: 12.8294 BETAP: 0.0674168

Next: stay at nel=0.4. Ip=400 kA.

Dec 18 1995 12:36:15:570PM 951218015 Jeff Schachter Disruption. 0.63 s

Dec 18 1995 12:54:10:330PM 951218016 Jeff Schachter Good shot. Nel=0.4, Ip=400 kA. Out of range for 8.0 T, but can do at
5.3 T.

Shot: 951218016 Time: 1.15000 Window: 0.350000
Bt = 2.57 T Ip = 0.39 MA Nel20 = 0.44 Te = 1.22 keV Pin = 0.53 MW
a = 22.0286 Zeff = 1.50

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.399883 0.443234 1.23385 0.548118
3.50000 0.538305 0.658808 1.50426 0.993261
5.30000 0.815147 1.14561 1.98364 2.27761
8.00000 1.23041 1.98360 2.61019 5.18928

RHOSTAR: 0.0195629 NUSTAR: 9.62031 BETAP: 0.0808997

Next shot: nel=0.6, Ip=400 kA

Dec 18 1995 01:10:52:730PM 951218017 Jeff Schachter Good shot. nel=0.6, Ip=400

Shot: 951218017 Time: 1.15000 Window: 0.350000
Bt = 2.57 T Ip = 0.39 MA Nel20 = 0.60 Te = 0.85 keV Pin = 0.57 MW
a = 22.1446 Zeff = 1.50

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.396469 0.614702 0.858109 0.579815
3.50000 0.533708 0.913673 1.04618 1.05070
5.30000 0.808186 1.58880 1.37957 2.40932
8.00000 1.21990 2.75098 1.81532 5.48937

RHOSTAR: 0.0162238 NUSTAR: 27.7293 BETAP: 0.0780298

Next: going to 3.5 T. Scale from shots 9&10.

Dec 18 1995 01:38:55:160PM 951218018 Jeff Schachter Bt a little high, Ip a little low, nel ok. Temperature looks like
its within 5%.

Shot: 951218018 Time: 1.36000 Window: 0.120000
Bt = 3.64 T Ip = 0.45 MA Nel20 = 0.78 Te = 1.03 keV Pin = 0.66 MW
a = 22.3323 Zeff = 1.50

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.324217 0.497173 0.818606 0.337635
3.50000 0.436446 0.738982 0.998018 0.611839
5.30000 0.660903 1.28502 1.31606 1.40298
8.00000 0.997590 2.22500 1.73175 3.19655

RHOSTAR: 0.0124428 NUSTAR: 24.8532 BETAP: 0.0602055

Next: try again.

Dec 18 1995 02:02:03:970PM 951218019 Jeff Schachter Much better. Ip and Nel within 5% (density a little low). Compares
well to shots 9,10

Shot: 951218019 Time: 1.00000 Window: 0.500000
Bt = 3.50 T Ip = 0.48 MA Nel20 = 0.75 Te = 1.07 keV Pin = 0.63 MW
a = 21.9332 Zeff = 1.50

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.353760 0.503203 0.880443 0.347380
3.50000 0.476216 0.747945 1.07341 0.629499
5.30000 0.721127 1.30061 1.41548 1.44348
8.00000 1.08849 2.25199 1.86257 3.28881

RHOSTAR: 0.0134834 NUSTAR: 21.3567 BETAP: 0.0655387

Dec 18 1995 02:03:13:460PM 951218020 Jeff Schachter Better. Zeff problems.

Shot: 951218020 Time: 1.00000 Window: 0.500000
Bt = 3.50 T Ip = 0.41 MA Nel20 = 0.65 Te = 1.13 keV Pin = 0.51 MW
a = 22.0051 Zeff = 1.50

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.307694 0.433216 0.925437 0.279489
3.50000 0.414203 0.643919 1.12826 0.506470
5.30000 0.627222 1.11972 1.48781 1.16137
8.00000 0.946750 1.93877 1.95775 2.64605

RHOSTAR: 0.0137789 NUSTAR: 16.6965 BETAP: 0.0593069

Dec 18 1995 02:23:24:390PM 951218021 Jeff Schachter Good. beta low. Zeff fixed.

Shot: 951218021 Time: 1.00000 Window: 0.400000
Bt = 3.51 T Ip = 0.41 MA Nel20 = 0.67 Te = 1.05 keV Pin = 0.56 MW
a = 21.7880 Zeff = 1.32

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.301486 0.446126 0.858466 0.305047
3.50000 0.405846 0.663107 1.04661 0.552785
5.30000 0.614567 1.15308 1.38015 1.26757
8.00000 0.927648 1.99655 1.81608 2.88802

RHOSTAR: 0.0133842 NUSTAR: 17.4750 BETAP: 0.0566544

Dec 18 1995 02:26:39:590PM 951218022 Jeff Schachter rerun shot 12 (2.6 T, 0.30 MA, Nel20=0.44) in order to get a half
decent Zeff measurement. Earl, where were you?

Dec 18 1995 02:45:25:580PM 951218023 Jeff Schachter Yucky shot. Plasma wretching like a madman. May compare better to 16
than 17.

Shot: 951218023 Time: 0.750000 Window: 0.250000
Bt = 3.51 T Ip = 0.53 MA Nel20 = 0.69 Te = 1.04 keV Pin = 0.77 MW
a = 21.9887 Zeff = 1.43

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.389654 0.465445 0.853557 0.423796
3.50000 0.524534 0.691823 1.04063 0.767974
5.30000 0.794294 1.20302 1.37225 1.76101
8.00000 1.19893 2.08301 1.80569 4.01227

RHOSTAR: 0.0132354 NUSTAR: 20.0641 BETAP: 0.0587699

Dec 18 1995 03:07:19:900PM 951218024 Jeff Schachter Try again. Compare to 17.
Something happens at 1.2 s: Nel before=0.83, after=0.93. Asked
for 0.91. Ip should be 530 kA.

YAG had init failure, so no data.

Dec 18 1995 03:25:02:430PM 951218025 Jeff Schachter Compare to 12,21,22
Field too high. Nel not constant.
Te should be 1.5 keV. Is 1.2 keV. Poh=0.9 MW, should be 1.5 MW.
Therefore ask for 0.6 MW. From 0.65 to 1.2 s.

Shot: 951218025 Time: 1.00000 Window: 0.100000
Bt = 5.37 T Ip = 0.61 MA Nel20 = 1.10 Te = 1.22 keV Pin = 0.89 MW
a = 22.2669 Zeff = 1.20

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.293912 0.417906 0.751229 0.209410
3.50000 0.395650 0.621162 0.915873 0.379479
5.30000 0.599127 1.08014 1.20774 0.870168
8.00000 0.904343 1.87026 1.58922 1.98258

RHOSTAR: 0.00922723 NUSTAR: 19.8606 BETAP: 0.0464413

Dec 18 1995 03:30:29:630PM 951218026 Jeff Schachter Better. No RF. Looks like we need 600 kW RF.

Shot: 951218026 Time: 0.850000 Window: 0.150000
Bt = 5.27 T Ip = 0.62 MA Nel20 = 1.08 Te = 1.28 keV Pin = 0.87 MW
a = 21.9411 Zeff = 1.29

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.305858 0.419810 0.799755 0.211478
3.50000 0.411732 0.623992 0.975035 0.383226
5.30000 0.623481 1.08507 1.28576 0.878760
8.00000 0.941103 1.87878 1.69187 2.00216

RHOSTAR: 0.00978784 NUSTAR: 18.6110 BETAP: 0.0496665

Dec 18 1995 03:40:35:830PM 951218027 Jeff Schachter RF. Trips out. Density still a little low. Te low (1.2 should be
1.5). Betap low (0.26; should be 0.3-0.35), nustar high. Therefore go
up in power. Got only 0.8 MW total input power.

Compare to 12,21,22

Shot: 951218027 Time: 1.05000 Window: 0.150000
Bt = 5.27 T Ip = 0.62 MA Nel20 = 1.09 Te = 1.20 keV Pin = 0.83 MW
a = 21.8914 Zeff = 1.52

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.306589 0.426637 0.751367 0.201426
3.50000 0.412716 0.634140 0.916042 0.365010
5.30000 0.624970 1.10271 1.20796 0.836991
8.00000 0.943351 1.90933 1.58951 1.90699

RHOSTAR: 0.00950948 NUSTAR: 25.1137 BETAP: 0.0474203

Dec 18 1995 03:53:39:150PM 951218028 Jeff Schachter Density right magnitude. RF ~ 0.6 MW Poh ~ 0.8 MW, Te ~ 1.6 keV.
Too high! WIll try to flat top density sooner.

Shot: 951218028 Time: 0.900000 Window: 0.300000
Bt = 5.26 T Ip = 0.62 MA Nel20 = 1.15 Te = 1.53 keV Pin = 0.81 MW
a = 21.8878 Zeff = 1.36

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.306999 0.449546 0.957781 0.198144
3.50000 0.413268 0.668190 1.16770 0.359062
5.30000 0.625806 1.16192 1.53981 0.823352
8.00000 0.944613 2.01185 2.02618 1.87592

RHOSTAR: 0.0107444 NUSTAR: 14.6282 BETAP: 0.0636933

Dec 18 1995 03:58:10:010PM 951218028 Jeff Schachter Oops. Calculation of total input power was wrong (with RF shots). here
is data for 28 again:

Shot: 951218028 Time: 0.900000 Window: 0.300000
Bt = 5.26 T Ip = 0.62 MA Nel20 = 1.15 Te = 1.53 keV Pin = 1.37 MW
a = 21.8878 Zeff = 1.36

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.306999 0.449546 0.957781 0.334768
3.50000 0.413268 0.668190 1.16770 0.606644
5.30000 0.625806 1.16192 1.53981 1.39107
8.00000 0.944613 2.01185 2.02618 3.16941

RHOSTAR: 0.0107444 NUSTAR: 14.6282 BETAP: 0.0636933

Ask for te=1.5 - got it. Pinput lower than expected (1.4 rather than
1.5 MW). Calculations of input power for 26,27 also wrong.

Dec 18 1995 04:13:13:340PM 951218029 Jeff Schachter Te too low. Density ok. Raise power for next shot.

Shot: 951218029 Time: 0.900000 Window: 0.300000
Bt = 5.26 T Ip = 0.62 MA Nel20 = 1.15 Te = 1.36 keV Pin = 1.31 MW
a = 21.8517 Zeff = 1.50

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.306351 0.450461 0.852188 0.320780
3.50000 0.412395 0.669551 1.03896 0.581296
5.30000 0.624484 1.16429 1.37005 1.33295
8.00000 0.942617 2.01595 1.80280 3.03697

RHOSTAR: 0.0101553 NUSTAR: 20.3699 BETAP: 0.0567867

Dec 18 1995 04:31:39:970PM 951218030 Jeff Schachter RF Power up to 0.7 MW. Te is good! 1.5 keV Density good too.
EFIT bombed - will rerun manually...

betap a little too low, and nustar a little to high. Already more power
than L-Mode.

Shot: 951218030 Time: 0.900000 Window: 0.300000
Bt = 5.25 T Ip = 0.62 MA Nel20 = 1.15 Te = 1.49 keV Pin = 1.43 MW
a = 21.8506 Zeff = 1.64

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.307535 0.451783 0.932794 0.349910
3.50000 0.413989 0.671515 1.13723 0.634083
5.30000 0.626897 1.16770 1.49964 1.45399
8.00000 0.946260 2.02186 1.97332 3.31276

RHOSTAR: 0.0106414 NUSTAR: 18.6203 BETAP: 0.0623402

Dec 18 1995 04:42:32:690PM 951218031 Jeff Schachter Golden! Nice nustar and beta.

compare to 12,20,21

Shot: 951218031 Time: 0.900000 Window: 0.300000
Bt = 5.26 T Ip = 0.62 MA Nel20 = 1.16 Te = 1.54 keV Pin = 1.48 MW
a = 21.8736 Zeff = 1.20

FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.307872 0.452375 0.965091 0.360049
3.50000 0.414443 0.672396 1.17661 0.652456
5.30000 0.627585 1.16924 1.55157 1.49612
8.00000 0.947298 2.02452 2.04164 3.40875

RHOSTAR: 0.0107926 NUSTAR: 12.7417 BETAP: 0.0645834

Next: try one shot for group 1 (shots 9,10,18,19): 715 kA, Nel=1.35

Dec 18 1995 04:54:42:870PM 951218032 Jeff Schachter Tried to get Ip=715 kA, and Nel=1.35.
Te=1.41 keV. Pinput=1.44 MW if L-Mode.

Density rise was late (didn't take off to 1.3 until 800 ms). RF rose
with density. No good flat top to average over. Te a bit high (1.6 keV)
At 1.0 s, passes good point.

*** Reich just told me YAG data went bad sometime between 26 and 29.
Therefore my calculations of nustar and betap are bad. Try to redo
with ECE. May need another run if real temperature is off significantly
from what YAG was saying (and what I was basing my analysis on) ***

Dec 18 1995 05:04:59:400PM 951218033 Jeff Schachter Fiducial. Not part of rhostar scan.

Dec 18 1995 05:13:24:410PM 951218034 Jeff Schachter Another fiducial. Not part of rhostar scan. Good.

So John was good for 30 shots in a row. Not bad. Too bad about the
YAG though.

Physics Operator Comments

Dec 18 1995 08:40:24:750AM John Goetz Run 951218
In support of Mini-Proposal # 122A - Rho-star Scaling
The goal of this run is to obtain a set of plasmas at 2.6T, 3.5T,
5.3T and 8.0T that are suitable for rho-star scaling analysis.

Program for this run:
- Set up a diverted shot with: Ip Bt ne20 heating
.35 2.6 .43 OH
.48 3.5 .65 OH
.73 5.3 1.1 ICRF
1.1 8.0 2.0 ICRF
- Make plasmas with dimensionless parameters (except rho-star)
as similar as possible.

Dec 18 1995 08:41:38:450AM John Goetz Run 951218
In support of Mini-Proposal # 122A - Rho-star Scaling

Load 951212015
TF current waveform = -150 on [-1.5,+.019]; -73 on [+.02,1.1]; 0
switch closing times: EF1's @ 0.1 and OH's @ 0.12
V_OH1 spike = 250V @ 0.12; reduce to 100V from there on
IP = -350000kA
NL04 = 0.5e20
remove RF loading feedback from RCUR
coldstart hybrid - all matrices respond

Dec 18 1995 08:42:41:220AM 951218001 John Goetz Shot 951218001:
OH coax resistance test

Results:
no CAMAC

Dec 18 1995 08:53:21:330AM 951218002 John Goetz Shot 951218002:
OH coax resistance test

Results:
resistance check o.k.

Dec 18 1995 09:17:03:230AM 951218003 John Goetz Shot 951218003:
Load 951212015
TF current waveform = -150 on [-1.5,+.019]; -73 on [+.02,1.1]; 0
switch closing times: EF1's @ 0.1 and OH's @ 0.12
V_OH1 spike = 250V @ 0.12; reduce to 100V from there on
IP = -350000kA
NL04 = 0.5e20
remove RF loading feedback from RCUR

Results:
plasma - disrupts @ 1.28
P_0 = 1.5e-5
IP = 0.35MA @ 0.7s; Bt=2.8T @ 0.8s; NL04=0.6e20

Dec 18 1995 09:29:09:910AM 951218004 John Goetz Shot 951218004:
remove 6kA from TF current waveform
NL04 = 0.4e20 and PG3 = 30V

Results:
plasma - disrupts @ 1.24
Ip = 0.35MA @ 0.7s; Bt=2.6T @ 0.8s; NL04=0.5e20
H-mode spotted @ 0.81sec
outer gap is growing -> a small plasma

Dec 18 1995 10:15:55:770AM 951218005 John Goetz Shot 951218005:
remove 6kA from TF current waveform pre-breakdown (-138kA)
RCUR ramped out to 0.675m
1/2 hour wait to cool Michelson
more gas early to lower Mo influx

Results:
Plasma - disr. @ 1.23
Bt = 2.6T @ 0.75 (breakdown @ 5.0T)
early Mo down

Dec 18 1995 10:33:38:420AM 951218006 John Goetz Shot 951218006:
TF current waveform pre-breakdown = -133kA
more gas early to lower Mo influx
removed ramp in CLEARIN (constant @ -.005)
extend PG3 voltage to 1.0sec

Results:
plasma - disr. @ 1.21
Bt = 2.6T @ 0.7sec - breakdown @ (4.8T)
density constant
inner gap better, but still growing

Dec 18 1995 10:51:59:920AM 951218007 John Goetz Shot 951218007:
setup for a 1.5sec shot by extending all appropriate waveforms
in the P's and V's to 1.5sec. Invert time for TF=1.5sec; PF's
=1.8sec; extend all gains to 1.5sec

Results:
plasma - disr. @ 1.57
current is drooping late and the lower x-point is climbing
up the divertor plates

Dec 18 1995 11:05:46:880AM 951218008 John Goetz Shot 951218008:
extend voltages on EF2's and OH2's (missed on 7)
add 4msec of Ar
IC_EF4 gain to 3

Results:
plasma - disr. @ 1.58
magnetics data corrupted - no EFIT

Dec 18 1995 11:20:01:170AM 951218009 John Goetz Shot 951218009:
RCUR = 0.68 (outer gap was 2.4cm)
remove half the Marmar puff

Results:
plasma - disrupts @ 1.63
RXL moving in; outer gap 1.4cm; inner gap 2.0cm

Dec 18 1995 11:42:27:160AM 951218010 John Goetz Shot 951218010:
remove Marmar puff completely
CLEARIN = -.008
hold out RXL longer

Results:
plasma - disrupts @ 1.67

Dec 18 1995 11:57:38:860AM 951218011 John Goetz Shot 951218011:
IP = -300000 and NL04 = 0.3e20 to scan Ohmic power

Results:
plasma - disrupts @ 1.66
Ohmic power down as requested
gaps constant

Dec 18 1995 12:09:07:590PM 951218012 John Goetz Shot 951218012:
early gas to combat Mo influx

Results:
plasma - disrupts @ 1.64
NL04 = 0.45e20

Dec 18 1995 12:19:56:360PM 951218013 John Goetz Shot 951218013:
PG3 = 28V
hold RXL at its starting value

Results:
plasma - disrupts @ 0.74
Dalpha rises @ 0.6 at crossover time, but no other
precursors or signatures

Dec 18 1995 12:28:08:780PM 951218014 John Goetz Shot 951218014:
no changes

Results:
plasma - disrupts @ 1.54
RF turn on @ 1.46 causes droop in current and RXL to move in

Dec 18 1995 12:43:11:590PM 951218015 John Goetz Shot 951218015:
IP = -400000

Results:
plasma - disrupts @ 0.65
no explanation for this one either

Dec 18 1995 12:55:00:710PM 951218016 John Goetz Shot 951218016:
no changes

Results:
plasma - disrupts @ 1.52
o.gap = 1.0cm -> RCUR is not independent of current

Dec 18 1995 01:05:00:450PM 951218017 John Goetz Shot 951218017:
NL04 = 0.5e20 (should give 0.6e20)

Results:
plasma - disrupts @ 1.64
NL04 = 0.61e20

Dec 18 1995 01:25:06:270PM 951218018 John Goetz Shot 951218018:
IP = -500000 @ 0.122 (when gain switches on) then ramp to 470kA
NL04 = 0.69e20
TF current = 98kA (gives 3.5T)

Results:
plasma - disrupts @ 1.67
current droops
Bt = 3.65T
small gaps

Dec 18 1995 01:41:40:680PM 951218019 John Goetz Shot 951218019:
TF current = 94kA (should give 3.5T)
slight ramp in IP
NL04 = 0.72e20
CLEARIN = -.008 & RCUR = 0.673

Results:
plasma - disrupts @ 1.68
within 5% on required dimensionless parameters

Dec 18 1995 02:04:45:090PM 951218020 John Goetz Shot 951218020:
IP = -410000
NL04 = 0.57e20
RCUR = 0.675 & CLEARIN = -.009

Results:
plasma - disrupts @ 1.69
IP = 410kA; NL04=0.65e20
gaps = 1.3cm
H-mode @ 1.32??

Dec 18 1995 02:21:13:090PM 951218021 John Goetz Shot 951218021:
NL04 = 0.58e20
RCUR = 0.676 & CLEARIN = -.007

Results:
plasma - disrupts @ 1.68
NL04=0.67e20; gaps = 1.5 cm
mini-disruption @ 0.2sec

Dec 18 1995 02:31:25:740PM 951218022 John Goetz Shot 951218022:
reload 951218012 to get Zeff data

Results:
plasma - disr. @ 1.56
looks like 951218012

Dec 18 1995 02:44:20:190PM 951218023 John Goetz Shot 951218023:
reload 951218021
IP = -530000
NL04 = 0.83e20
Bt = 3.5T

Results:
plasma - disrupts @ 1.25sec
discharge didn't take up the gas
all neutral light signals indicate an event @ 0.92sec
outer gap = 0.9cm

Dec 18 1995 03:00:46:090PM 951218024 John Goetz Shot 951218023:
RCUR = 0.673cm

Results:
plasma - disrupts @ 1.67
not acceptable - no YAG data

Dec 18 1995 03:15:22:380PM 951218025 John Goetz Shot 951218025:
rampdown time @ 1.2sec
TF invert = 1.2sec; PF invert time = 1.7sec
IP = -615000; NL04 = 1.15e20
TF current = -148kA (5.3T)
PG3 off at 1.2sec

Results:
plasma- disrupts @ 1.47
Bt=5.4T; current droops to 600kA; NL04 just makes it to 1.1e20
small gaps

Dec 18 1995 03:27:05:270PM 951218026 John Goetz Shot 951218026:
TF current = -145kA
IP ramp to -630kA
PG3 = 34V
RCUR = 0.67 & CLEARIN = -.005

Results:
plasma - disrupts @ 1.52
current o.k.; field o.k.; density not quite there yet;
gaps o.k.

Dec 18 1995 03:37:37:340PM 951218027 John Goetz Shot 951218027:
PG3 = 37V and 50V early in segment 2

Results:
plasma - disrupts @ 1.50
density flat but only 1.0 -> 1.1

Dec 18 1995 03:52:54:860PM 951218028 John Goetz Shot 951218028:
PG3 = 41V and NL04 = 1.25e20

Results:
plasma - disrupts @ 1.46
NL04 = 1.1 -> 1.2
temperature too high

Dec 18 1995 04:03:09:350PM 951218029 John Goetz Shot 951218029:
more PG3 between 0.2 and 0.5

Results:
plasma - disrupts @ 1.44
density acceptable
temperature too low

Dec 18 1995 04:26:50:290PM 951218030 John Goetz Shot 951218030:
a pinch more RF power

Results:
plasma - disrupts @ 1.46
almost have a good match to previous dimensionless parameters

Dec 18 1995 04:41:51:680PM 951218031 John Goetz Shot 951218031:
a pinch more RF power

Results:
plasma - disr. @ 1.45
good match to previous dimensionless parameters

Dec 18 1995 05:00:33:180PM 951218032 John Goetz Shot 951218032:
IP = -715000
NL04 = 1.42e20
PG3 = 46V

Results:
plasma - disr. @ 1.47
density doesn't rise fast enough
not much right on this shot

Dec 18 1995 05:06:08:650PM 951218033 John Goetz Shot 951218033:
load 951212017 for fiducial shot

Results:
strong fizzle
too much Br

Dec 18 1995 05:29:16:420PM 951218034 John Goetz Shot 951218034:
BR_0 = .0064

Results:
plasma - all the way down
acceptable fiducial

Engineering Operator Comments

Shot Time Type Status Comment

1 08:33:24:380AM Test Ok

2 08:48:40:500AM Test Ok

3 09:02:59:040AM Plasma Ok

4 09:15:52:510AM Plasma Ok

5 10:04:57:030AM Plasma Ok

6 10:16:27:570AM Plasma Ok

7 10:34:15:910AM Plasma Ok

8 10:52:41:350AM Plasma Ok

9 11:08:13:950AM Plasma Ok

10 11:32:07:880AM Plasma Ok

11 11:45:13:150AM Plasma Ok

12 11:58:12:960AM Plasma Ok

13 12:09:59:690PM Plasma Ok

14 12:19:03:120PM Plasma Ok

15 12:31:45:780PM Plasma Ok

16 12:43:30:890PM Plasma Ok

17 12:55:49:550PM Plasma Ok

18 01:13:12:080PM Plasma Ok

19 01:27:58:790PM Plasma Ok

20 01:42:43:870PM Plasma Ok

21 02:07:48:900PM Plasma Ok

22 02:22:24:360PM Plasma Ok

23 02:32:48:930PM Plasma Ok

24 02:46:39:550PM Plasma Ok

25 03:03:42:680PM Plasma Ok

26 03:16:21:480PM Plasma Ok

27 03:28:39:030PM Plasma Ok

28 03:42:04:820PM Plasma Ok

29 03:55:27:930PM Plasma Ok

30 04:06:37:470PM Plasma Ok

31 04:30:53:100PM Plasma Ok

32 04:45:26:720PM Plasma Ok

33 05:01:00:810PM Plasma Ok

34 05:11:47:370PM Plasma Ok

Session Leader Comments
Dec 18 1995 09:55:54:200AM	951218003	Jeff Schachter	Shot: 951218003 Time: 0.900000 Window: 0.100000 Bt = 2.80 T Ip = 0.35 MA Nel20 = 0.60 Te = 1.03 keV Pin = 0.40 MW a = 20.6671 Zeff = 1.42 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.323571 0.545077 0.984456 0.342116 3.50000 0.435577 0.810185 1.20022 0.619959 5.30000 0.659588 1.40884 1.58270 1.42160 8.00000 0.995604 2.43938 2.08261 3.23897 RHOSTAR: 0.0175949 NUSTAR: 16.4638 BETAP: 0.0793794 Field ~ 2.8 T and not steady. Try for lower field (2.6) and longer, steadier flattop. Lower density too (though this one is ok.)
Dec 18 1995 09:54:07:970AM	951218004	Jeff Schachter	Shot: 951218004 Time: 0.925000 Window: 0.0750000 Bt = 2.58 T Ip = 0.35 MA Nel20 = 0.48 Te = 1.16 keV Pin = 0.39 MW a = 20.5229 Zeff = 1.66 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.350712 0.487963 1.17164 0.398694 3.50000 0.472113 0.725292 1.42843 0.722486 5.30000 0.714913 1.26122 1.88364 1.65670 8.00000 1.07911 2.18378 2.47860 3.77462 RHOSTAR: 0.0204102 NUSTAR: 12.1200 BETAP: 0.0845737 Better shot - try to lengthen flat top at 2.6 and increase a. Looks like we have a reasonable window in density and current.
Dec 18 1995 10:16:08:480AM	951218005	Jeff Schachter	Shot: 951218005 Time: 0.900000 Window: 0.100000 Bt = 2.58 T Ip = 0.35 MA Nel20 = 0.50 Te = 1.04 keV Pin = 0.41 MW a = 20.9525 Zeff = 1.70 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.349241 0.504499 1.04510 0.422236 3.50000 0.470132 0.749872 1.27415 0.765147 5.30000 0.711914 1.30396 1.68020 1.75453 8.00000 1.07459 2.25779 2.21090 3.99750 RHOSTAR: 0.0188841 NUSTAR: 16.4728 BETAP: 0.0779960 Flat top could be longer. Left gap ok, fix right gap. Input power may be too high at 8.0, but thats ok.
Dec 18 1995 10:27:18:400AM	951218006	Jeff Schachter	Shot: 951218006 Time: 0.890000 Window: 0.110000 Bt = 2.57 T Ip = 0.35 MA Nel20 = 0.51 Te = 0.99 keV Pin = 0.45 MW a = 21.0785 Zeff = 1.69 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.348917 0.516892 0.996062 0.454911 3.50000 0.469696 0.768292 1.21437 0.824357 5.30000 0.711255 1.33599 1.60136 1.89030 8.00000 1.07359 2.31325 2.10716 4.30685 RHOSTAR: 0.0183398 NUSTAR: 18.5620 BETAP: 0.0761622 Much better flat top - longer, and density more constant. Try for even longer - by extending pulse past 1.0 s.
Dec 18 1995 11:02:35:190AM	951218007	Jeff Schachter	Beautiful flattop - nice and long. Will rerun to get Ti profiles from Hirex. EFIT problem - will need to be rerun.
Dec 18 1995 11:03:17:890AM	951218007	Jeff Schachter	Beautiful flattop - nice and long. Will rerun to get Ti profiles from Hirex. EFIT problem - will need to be rerun.
Dec 18 1995 11:03:19:780AM	951218007	Jeff Schachter	Beautiful flattop - nice and long. Will rerun to get Ti profiles from Hirex. EFIT problem - will need to be rerun.
Dec 18 1995 11:17:13:030AM	951218007	Jeff Schachter	Shot: 951218007 Time: 1.15000 Window: 0.350000 Bt = 2.57 T Ip = 0.34 MA Nel20 = 0.51 Te = 0.98 keV Pin = 0.43 MW a = 20.9818 Zeff = 1.53 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.341173 0.517928 0.989604 0.437436 3.50000 0.459272 0.769831 1.20649 0.792690 5.30000 0.695469 1.33867 1.59097 1.81769 8.00000 1.04976 2.31788 2.09350 4.14140 RHOSTAR: 0.0183803 NUSTAR: 16.9448 BETAP: 0.0758200
Dec 18 1995 11:04:27:040AM	951218008	Jeff Schachter	Another beautiful flattop - nice and long. Magnetics problem - can't get EFIT data for this shot. Outer gap is ~ 2.4 cm, should be ~ 1.5 cm.
Dec 18 1995 11:30:22:320AM	951218009	Jeff Schachter	Gaps better. Triangularity not constant. Nice flat top otherwise. Zeff screwed up. Will fix for next shot. Assuming Zeff=1.5... Shot: 951218009 Time: 1.15000 Window: 0.350000 Bt = 2.57 T Ip = 0.35 MA Nel20 = 0.53 Te = 0.93 keV Pin = 0.47 MW a = 21.5114 Zeff = 1.50 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.349773 0.537217 0.933991 0.478409 3.50000 0.470848 0.798502 1.13869 0.866939 5.30000 0.712998 1.38852 1.50157 1.98794 8.00000 1.07622 2.40421 1.97585 4.52931 RHOSTAR: 0.0174154 NUSTAR: 19.8712 BETAP: 0.0742242
Dec 18 1995 11:45:10:890AM	951218010	Jeff Schachter	More zeff problems. Otherwise good. Shot: 951218010 Time: 1.15000 Window: 0.350000 Bt = 2.57 T Ip = 0.35 MA Nel20 = 0.52 Te = 0.91 keV Pin = 0.46 MW a = 21.7278 Zeff = 1.50 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.349900 0.528215 0.921725 0.474091 3.50000 0.471019 0.785121 1.12374 0.859114 5.30000 0.713257 1.36526 1.48185 1.97000 8.00000 1.07661 2.36392 1.94990 4.48843 RHOSTAR: 0.0171229 NUSTAR: 20.2636 BETAP: 0.0720220 Next shot: down to nel=0.4, Ip=300.
Dec 18 1995 11:56:50:890AM	951218011	Jeff Schachter	Nice flat top. Got 305 kA and nel=0.42. Power scales to 3.5 MW. Still guessing Zeff (problems). Shot: 951218011 Time: 1.15000 Window: 0.350000 Bt = 2.57 T Ip = 0.30 MA Nel20 = 0.42 Te = 1.01 keV Pin = 0.37 MW a = 21.7498 Zeff = 1.50 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.307599 0.428768 1.01587 0.375287 3.50000 0.414076 0.637307 1.23851 0.680069 5.30000 0.627029 1.10822 1.63320 1.55944 8.00000 0.946459 1.91887 2.14906 3.55301 RHOSTAR: 0.0179464 NUSTAR: 13.5549 BETAP: 0.0644336
Dec 18 1995 12:08:57:930PM	951218012	Jeff Schachter	density a bit higher, gap off by a few mm. Try again for Hirex. Shot: 951218012 Time: 1.15000 Window: 0.350000 Bt = 2.57 T Ip = 0.30 MA Nel20 = 0.44 Te = 0.94 keV Pin = 0.40 MW a = 21.3118 Zeff = 1.50 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.301872 0.446125 0.950190 0.409576 3.50000 0.406366 0.663106 1.15844 0.742205 5.30000 0.615354 1.15308 1.52761 1.70192 8.00000 0.928836 1.99654 2.01012 3.87764 RHOSTAR: 0.0177251 NUSTAR: 15.7960 BETAP: 0.0627077
Dec 18 1995 12:16:13:890PM	951218013	Jeff Schachter	Disruption at 0.75 s.
Dec 18 1995 12:28:07:610PM	951218014	Jeff Schachter	Nice... use with 12. Shot: 951218014 Time: 1.15000 Window: 0.350000 Bt = 2.57 T Ip = 0.30 MA Nel20 = 0.43 Te = 1.04 keV Pin = 0.37 MW a = 21.5851 Zeff = 1.50 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.304580 0.434974 1.04773 0.379031 3.50000 0.410012 0.646532 1.27736 0.686853 5.30000 0.620875 1.12426 1.68443 1.57500 8.00000 0.937170 1.94664 2.21647 3.58846 RHOSTAR: 0.0183879 NUSTAR: 12.8294 BETAP: 0.0674168 Next: stay at nel=0.4. Ip=400 kA.
Dec 18 1995 12:36:15:570PM	951218015	Jeff Schachter	Disruption. 0.63 s
Dec 18 1995 12:54:10:330PM	951218016	Jeff Schachter	Good shot. Nel=0.4, Ip=400 kA. Out of range for 8.0 T, but can do at 5.3 T. Shot: 951218016 Time: 1.15000 Window: 0.350000 Bt = 2.57 T Ip = 0.39 MA Nel20 = 0.44 Te = 1.22 keV Pin = 0.53 MW a = 22.0286 Zeff = 1.50 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.399883 0.443234 1.23385 0.548118 3.50000 0.538305 0.658808 1.50426 0.993261 5.30000 0.815147 1.14561 1.98364 2.27761 8.00000 1.23041 1.98360 2.61019 5.18928 RHOSTAR: 0.0195629 NUSTAR: 9.62031 BETAP: 0.0808997 Next shot: nel=0.6, Ip=400 kA
Dec 18 1995 01:10:52:730PM	951218017	Jeff Schachter	Good shot. nel=0.6, Ip=400 Shot: 951218017 Time: 1.15000 Window: 0.350000 Bt = 2.57 T Ip = 0.39 MA Nel20 = 0.60 Te = 0.85 keV Pin = 0.57 MW a = 22.1446 Zeff = 1.50 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.396469 0.614702 0.858109 0.579815 3.50000 0.533708 0.913673 1.04618 1.05070 5.30000 0.808186 1.58880 1.37957 2.40932 8.00000 1.21990 2.75098 1.81532 5.48937 RHOSTAR: 0.0162238 NUSTAR: 27.7293 BETAP: 0.0780298 Next: going to 3.5 T. Scale from shots 9&10.
Dec 18 1995 01:38:55:160PM	951218018	Jeff Schachter	Bt a little high, Ip a little low, nel ok. Temperature looks like its within 5%. Shot: 951218018 Time: 1.36000 Window: 0.120000 Bt = 3.64 T Ip = 0.45 MA Nel20 = 0.78 Te = 1.03 keV Pin = 0.66 MW a = 22.3323 Zeff = 1.50 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.324217 0.497173 0.818606 0.337635 3.50000 0.436446 0.738982 0.998018 0.611839 5.30000 0.660903 1.28502 1.31606 1.40298 8.00000 0.997590 2.22500 1.73175 3.19655 RHOSTAR: 0.0124428 NUSTAR: 24.8532 BETAP: 0.0602055 Next: try again.
Dec 18 1995 02:02:03:970PM	951218019	Jeff Schachter	Much better. Ip and Nel within 5% (density a little low). Compares well to shots 9,10 Shot: 951218019 Time: 1.00000 Window: 0.500000 Bt = 3.50 T Ip = 0.48 MA Nel20 = 0.75 Te = 1.07 keV Pin = 0.63 MW a = 21.9332 Zeff = 1.50 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.353760 0.503203 0.880443 0.347380 3.50000 0.476216 0.747945 1.07341 0.629499 5.30000 0.721127 1.30061 1.41548 1.44348 8.00000 1.08849 2.25199 1.86257 3.28881 RHOSTAR: 0.0134834 NUSTAR: 21.3567 BETAP: 0.0655387
Dec 18 1995 02:03:13:460PM	951218020	Jeff Schachter	Better. Zeff problems. Shot: 951218020 Time: 1.00000 Window: 0.500000 Bt = 3.50 T Ip = 0.41 MA Nel20 = 0.65 Te = 1.13 keV Pin = 0.51 MW a = 22.0051 Zeff = 1.50 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.307694 0.433216 0.925437 0.279489 3.50000 0.414203 0.643919 1.12826 0.506470 5.30000 0.627222 1.11972 1.48781 1.16137 8.00000 0.946750 1.93877 1.95775 2.64605 RHOSTAR: 0.0137789 NUSTAR: 16.6965 BETAP: 0.0593069
Dec 18 1995 02:23:24:390PM	951218021	Jeff Schachter	Good. beta low. Zeff fixed. Shot: 951218021 Time: 1.00000 Window: 0.400000 Bt = 3.51 T Ip = 0.41 MA Nel20 = 0.67 Te = 1.05 keV Pin = 0.56 MW a = 21.7880 Zeff = 1.32 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.301486 0.446126 0.858466 0.305047 3.50000 0.405846 0.663107 1.04661 0.552785 5.30000 0.614567 1.15308 1.38015 1.26757 8.00000 0.927648 1.99655 1.81608 2.88802 RHOSTAR: 0.0133842 NUSTAR: 17.4750 BETAP: 0.0566544
Dec 18 1995 02:26:39:590PM	951218022	Jeff Schachter	rerun shot 12 (2.6 T, 0.30 MA, Nel20=0.44) in order to get a half decent Zeff measurement. Earl, where were you?
Dec 18 1995 02:45:25:580PM	951218023	Jeff Schachter	Yucky shot. Plasma wretching like a madman. May compare better to 16 than 17. Shot: 951218023 Time: 0.750000 Window: 0.250000 Bt = 3.51 T Ip = 0.53 MA Nel20 = 0.69 Te = 1.04 keV Pin = 0.77 MW a = 21.9887 Zeff = 1.43 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.389654 0.465445 0.853557 0.423796 3.50000 0.524534 0.691823 1.04063 0.767974 5.30000 0.794294 1.20302 1.37225 1.76101 8.00000 1.19893 2.08301 1.80569 4.01227 RHOSTAR: 0.0132354 NUSTAR: 20.0641 BETAP: 0.0587699
Dec 18 1995 03:07:19:900PM	951218024	Jeff Schachter	Try again. Compare to 17. Something happens at 1.2 s: Nel before=0.83, after=0.93. Asked for 0.91. Ip should be 530 kA. YAG had init failure, so no data.
Dec 18 1995 03:25:02:430PM	951218025	Jeff Schachter	Compare to 12,21,22 Field too high. Nel not constant. Te should be 1.5 keV. Is 1.2 keV. Poh=0.9 MW, should be 1.5 MW. Therefore ask for 0.6 MW. From 0.65 to 1.2 s. Shot: 951218025 Time: 1.00000 Window: 0.100000 Bt = 5.37 T Ip = 0.61 MA Nel20 = 1.10 Te = 1.22 keV Pin = 0.89 MW a = 22.2669 Zeff = 1.20 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.293912 0.417906 0.751229 0.209410 3.50000 0.395650 0.621162 0.915873 0.379479 5.30000 0.599127 1.08014 1.20774 0.870168 8.00000 0.904343 1.87026 1.58922 1.98258 RHOSTAR: 0.00922723 NUSTAR: 19.8606 BETAP: 0.0464413
Dec 18 1995 03:30:29:630PM	951218026	Jeff Schachter	Better. No RF. Looks like we need 600 kW RF. Shot: 951218026 Time: 0.850000 Window: 0.150000 Bt = 5.27 T Ip = 0.62 MA Nel20 = 1.08 Te = 1.28 keV Pin = 0.87 MW a = 21.9411 Zeff = 1.29 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.305858 0.419810 0.799755 0.211478 3.50000 0.411732 0.623992 0.975035 0.383226 5.30000 0.623481 1.08507 1.28576 0.878760 8.00000 0.941103 1.87878 1.69187 2.00216 RHOSTAR: 0.00978784 NUSTAR: 18.6110 BETAP: 0.0496665
Dec 18 1995 03:40:35:830PM	951218027	Jeff Schachter	RF. Trips out. Density still a little low. Te low (1.2 should be 1.5). Betap low (0.26; should be 0.3-0.35), nustar high. Therefore go up in power. Got only 0.8 MW total input power. Compare to 12,21,22 Shot: 951218027 Time: 1.05000 Window: 0.150000 Bt = 5.27 T Ip = 0.62 MA Nel20 = 1.09 Te = 1.20 keV Pin = 0.83 MW a = 21.8914 Zeff = 1.52 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.306589 0.426637 0.751367 0.201426 3.50000 0.412716 0.634140 0.916042 0.365010 5.30000 0.624970 1.10271 1.20796 0.836991 8.00000 0.943351 1.90933 1.58951 1.90699 RHOSTAR: 0.00950948 NUSTAR: 25.1137 BETAP: 0.0474203
Dec 18 1995 03:53:39:150PM	951218028	Jeff Schachter	Density right magnitude. RF ~ 0.6 MW Poh ~ 0.8 MW, Te ~ 1.6 keV. Too high! WIll try to flat top density sooner. Shot: 951218028 Time: 0.900000 Window: 0.300000 Bt = 5.26 T Ip = 0.62 MA Nel20 = 1.15 Te = 1.53 keV Pin = 0.81 MW a = 21.8878 Zeff = 1.36 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.306999 0.449546 0.957781 0.198144 3.50000 0.413268 0.668190 1.16770 0.359062 5.30000 0.625806 1.16192 1.53981 0.823352 8.00000 0.944613 2.01185 2.02618 1.87592 RHOSTAR: 0.0107444 NUSTAR: 14.6282 BETAP: 0.0636933
Dec 18 1995 03:58:10:010PM	951218028	Jeff Schachter	Oops. Calculation of total input power was wrong (with RF shots). here is data for 28 again: Shot: 951218028 Time: 0.900000 Window: 0.300000 Bt = 5.26 T Ip = 0.62 MA Nel20 = 1.15 Te = 1.53 keV Pin = 1.37 MW a = 21.8878 Zeff = 1.36 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.306999 0.449546 0.957781 0.334768 3.50000 0.413268 0.668190 1.16770 0.606644 5.30000 0.625806 1.16192 1.53981 1.39107 8.00000 0.944613 2.01185 2.02618 3.16941 RHOSTAR: 0.0107444 NUSTAR: 14.6282 BETAP: 0.0636933 Ask for te=1.5 - got it. Pinput lower than expected (1.4 rather than 1.5 MW). Calculations of input power for 26,27 also wrong.
Dec 18 1995 04:13:13:340PM	951218029	Jeff Schachter	Te too low. Density ok. Raise power for next shot. Shot: 951218029 Time: 0.900000 Window: 0.300000 Bt = 5.26 T Ip = 0.62 MA Nel20 = 1.15 Te = 1.36 keV Pin = 1.31 MW a = 21.8517 Zeff = 1.50 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.306351 0.450461 0.852188 0.320780 3.50000 0.412395 0.669551 1.03896 0.581296 5.30000 0.624484 1.16429 1.37005 1.33295 8.00000 0.942617 2.01595 1.80280 3.03697 RHOSTAR: 0.0101553 NUSTAR: 20.3699 BETAP: 0.0567867
Dec 18 1995 04:31:39:970PM	951218030	Jeff Schachter	RF Power up to 0.7 MW. Te is good! 1.5 keV Density good too. EFIT bombed - will rerun manually... betap a little too low, and nustar a little to high. Already more power than L-Mode. Shot: 951218030 Time: 0.900000 Window: 0.300000 Bt = 5.25 T Ip = 0.62 MA Nel20 = 1.15 Te = 1.49 keV Pin = 1.43 MW a = 21.8506 Zeff = 1.64 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.307535 0.451783 0.932794 0.349910 3.50000 0.413989 0.671515 1.13723 0.634083 5.30000 0.626897 1.16770 1.49964 1.45399 8.00000 0.946260 2.02186 1.97332 3.31276 RHOSTAR: 0.0106414 NUSTAR: 18.6203 BETAP: 0.0623402
Dec 18 1995 04:42:32:690PM	951218031	Jeff Schachter	Golden! Nice nustar and beta. compare to 12,20,21 Shot: 951218031 Time: 0.900000 Window: 0.300000 Bt = 5.26 T Ip = 0.62 MA Nel20 = 1.16 Te = 1.54 keV Pin = 1.48 MW a = 21.8736 Zeff = 1.20 FIELD (T) IP (MA) NEL (e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.307872 0.452375 0.965091 0.360049 3.50000 0.414443 0.672396 1.17661 0.652456 5.30000 0.627585 1.16924 1.55157 1.49612 8.00000 0.947298 2.02452 2.04164 3.40875 RHOSTAR: 0.0107926 NUSTAR: 12.7417 BETAP: 0.0645834 Next: try one shot for group 1 (shots 9,10,18,19): 715 kA, Nel=1.35
Dec 18 1995 04:54:42:870PM	951218032	Jeff Schachter	Tried to get Ip=715 kA, and Nel=1.35. Te=1.41 keV. Pinput=1.44 MW if L-Mode. Density rise was late (didn't take off to 1.3 until 800 ms). RF rose with density. No good flat top to average over. Te a bit high (1.6 keV) At 1.0 s, passes good point. * Reich just told me YAG data went bad sometime between 26 and 29. Therefore my calculations of nustar and betap are bad. Try to redo with ECE. May need another run if real temperature is off significantly from what YAG was saying (and what I was basing my analysis on) *
Dec 18 1995 05:04:59:400PM	951218033	Jeff Schachter	Fiducial. Not part of rhostar scan.
Dec 18 1995 05:13:24:410PM	951218034	Jeff Schachter	Another fiducial. Not part of rhostar scan. Good. So John was good for 30 shots in a row. Not bad. Too bad about the YAG though.

Physics Operator Comments
Dec 18 1995 08:40:24:750AM		John Goetz	Run 951218 In support of Mini-Proposal # 122A - Rho-star Scaling The goal of this run is to obtain a set of plasmas at 2.6T, 3.5T, 5.3T and 8.0T that are suitable for rho-star scaling analysis. Program for this run: - Set up a diverted shot with: Ip Bt ne20 heating .35 2.6 .43 OH .48 3.5 .65 OH .73 5.3 1.1 ICRF 1.1 8.0 2.0 ICRF - Make plasmas with dimensionless parameters (except rho-star) as similar as possible.
Dec 18 1995 08:41:38:450AM		John Goetz	Run 951218 In support of Mini-Proposal # 122A - Rho-star Scaling Load 951212015 TF current waveform = -150 on [-1.5,+.019]; -73 on [+.02,1.1]; 0 switch closing times: EF1's @ 0.1 and OH's @ 0.12 V_OH1 spike = 250V @ 0.12; reduce to 100V from there on IP = -350000kA NL04 = 0.5e20 remove RF loading feedback from RCUR coldstart hybrid - all matrices respond
Dec 18 1995 08:42:41:220AM	951218001	John Goetz	Shot 951218001: OH coax resistance test Results: no CAMAC
Dec 18 1995 08:53:21:330AM	951218002	John Goetz	Shot 951218002: OH coax resistance test Results: resistance check o.k.
Dec 18 1995 09:17:03:230AM	951218003	John Goetz	Shot 951218003: Load 951212015 TF current waveform = -150 on [-1.5,+.019]; -73 on [+.02,1.1]; 0 switch closing times: EF1's @ 0.1 and OH's @ 0.12 V_OH1 spike = 250V @ 0.12; reduce to 100V from there on IP = -350000kA NL04 = 0.5e20 remove RF loading feedback from RCUR Results: plasma - disrupts @ 1.28 P_0 = 1.5e-5 IP = 0.35MA @ 0.7s; Bt=2.8T @ 0.8s; NL04=0.6e20
Dec 18 1995 09:29:09:910AM	951218004	John Goetz	Shot 951218004: remove 6kA from TF current waveform NL04 = 0.4e20 and PG3 = 30V Results: plasma - disrupts @ 1.24 Ip = 0.35MA @ 0.7s; Bt=2.6T @ 0.8s; NL04=0.5e20 H-mode spotted @ 0.81sec outer gap is growing -> a small plasma
Dec 18 1995 10:15:55:770AM	951218005	John Goetz	Shot 951218005: remove 6kA from TF current waveform pre-breakdown (-138kA) RCUR ramped out to 0.675m 1/2 hour wait to cool Michelson more gas early to lower Mo influx Results: Plasma - disr. @ 1.23 Bt = 2.6T @ 0.75 (breakdown @ 5.0T) early Mo down
Dec 18 1995 10:33:38:420AM	951218006	John Goetz	Shot 951218006: TF current waveform pre-breakdown = -133kA more gas early to lower Mo influx removed ramp in CLEARIN (constant @ -.005) extend PG3 voltage to 1.0sec Results: plasma - disr. @ 1.21 Bt = 2.6T @ 0.7sec - breakdown @ (4.8T) density constant inner gap better, but still growing
Dec 18 1995 10:51:59:920AM	951218007	John Goetz	Shot 951218007: setup for a 1.5sec shot by extending all appropriate waveforms in the P's and V's to 1.5sec. Invert time for TF=1.5sec; PF's =1.8sec; extend all gains to 1.5sec Results: plasma - disr. @ 1.57 current is drooping late and the lower x-point is climbing up the divertor plates
Dec 18 1995 11:05:46:880AM	951218008	John Goetz	Shot 951218008: extend voltages on EF2's and OH2's (missed on 7) add 4msec of Ar IC_EF4 gain to 3 Results: plasma - disr. @ 1.58 magnetics data corrupted - no EFIT
Dec 18 1995 11:20:01:170AM	951218009	John Goetz	Shot 951218009: RCUR = 0.68 (outer gap was 2.4cm) remove half the Marmar puff Results: plasma - disrupts @ 1.63 RXL moving in; outer gap 1.4cm; inner gap 2.0cm
Dec 18 1995 11:42:27:160AM	951218010	John Goetz	Shot 951218010: remove Marmar puff completely CLEARIN = -.008 hold out RXL longer Results: plasma - disrupts @ 1.67
Dec 18 1995 11:57:38:860AM	951218011	John Goetz	Shot 951218011: IP = -300000 and NL04 = 0.3e20 to scan Ohmic power Results: plasma - disrupts @ 1.66 Ohmic power down as requested gaps constant
Dec 18 1995 12:09:07:590PM	951218012	John Goetz	Shot 951218012: early gas to combat Mo influx Results: plasma - disrupts @ 1.64 NL04 = 0.45e20
Dec 18 1995 12:19:56:360PM	951218013	John Goetz	Shot 951218013: PG3 = 28V hold RXL at its starting value Results: plasma - disrupts @ 0.74 Dalpha rises @ 0.6 at crossover time, but no other precursors or signatures
Dec 18 1995 12:28:08:780PM	951218014	John Goetz	Shot 951218014: no changes Results: plasma - disrupts @ 1.54 RF turn on @ 1.46 causes droop in current and RXL to move in
Dec 18 1995 12:43:11:590PM	951218015	John Goetz	Shot 951218015: IP = -400000 Results: plasma - disrupts @ 0.65 no explanation for this one either
Dec 18 1995 12:55:00:710PM	951218016	John Goetz	Shot 951218016: no changes Results: plasma - disrupts @ 1.52 o.gap = 1.0cm -> RCUR is not independent of current
Dec 18 1995 01:05:00:450PM	951218017	John Goetz	Shot 951218017: NL04 = 0.5e20 (should give 0.6e20) Results: plasma - disrupts @ 1.64 NL04 = 0.61e20
Dec 18 1995 01:25:06:270PM	951218018	John Goetz	Shot 951218018: IP = -500000 @ 0.122 (when gain switches on) then ramp to 470kA NL04 = 0.69e20 TF current = 98kA (gives 3.5T) Results: plasma - disrupts @ 1.67 current droops Bt = 3.65T small gaps
Dec 18 1995 01:41:40:680PM	951218019	John Goetz	Shot 951218019: TF current = 94kA (should give 3.5T) slight ramp in IP NL04 = 0.72e20 CLEARIN = -.008 & RCUR = 0.673 Results: plasma - disrupts @ 1.68 within 5% on required dimensionless parameters
Dec 18 1995 02:04:45:090PM	951218020	John Goetz	Shot 951218020: IP = -410000 NL04 = 0.57e20 RCUR = 0.675 & CLEARIN = -.009 Results: plasma - disrupts @ 1.69 IP = 410kA; NL04=0.65e20 gaps = 1.3cm H-mode @ 1.32??
Dec 18 1995 02:21:13:090PM	951218021	John Goetz	Shot 951218021: NL04 = 0.58e20 RCUR = 0.676 & CLEARIN = -.007 Results: plasma - disrupts @ 1.68 NL04=0.67e20; gaps = 1.5 cm mini-disruption @ 0.2sec
Dec 18 1995 02:31:25:740PM	951218022	John Goetz	Shot 951218022: reload 951218012 to get Zeff data Results: plasma - disr. @ 1.56 looks like 951218012
Dec 18 1995 02:44:20:190PM	951218023	John Goetz	Shot 951218023: reload 951218021 IP = -530000 NL04 = 0.83e20 Bt = 3.5T Results: plasma - disrupts @ 1.25sec discharge didn't take up the gas all neutral light signals indicate an event @ 0.92sec outer gap = 0.9cm
Dec 18 1995 03:00:46:090PM	951218024	John Goetz	Shot 951218023: RCUR = 0.673cm Results: plasma - disrupts @ 1.67 not acceptable - no YAG data
Dec 18 1995 03:15:22:380PM	951218025	John Goetz	Shot 951218025: rampdown time @ 1.2sec TF invert = 1.2sec; PF invert time = 1.7sec IP = -615000; NL04 = 1.15e20 TF current = -148kA (5.3T) PG3 off at 1.2sec Results: plasma- disrupts @ 1.47 Bt=5.4T; current droops to 600kA; NL04 just makes it to 1.1e20 small gaps
Dec 18 1995 03:27:05:270PM	951218026	John Goetz	Shot 951218026: TF current = -145kA IP ramp to -630kA PG3 = 34V RCUR = 0.67 & CLEARIN = -.005 Results: plasma - disrupts @ 1.52 current o.k.; field o.k.; density not quite there yet; gaps o.k.
Dec 18 1995 03:37:37:340PM	951218027	John Goetz	Shot 951218027: PG3 = 37V and 50V early in segment 2 Results: plasma - disrupts @ 1.50 density flat but only 1.0 -> 1.1
Dec 18 1995 03:52:54:860PM	951218028	John Goetz	Shot 951218028: PG3 = 41V and NL04 = 1.25e20 Results: plasma - disrupts @ 1.46 NL04 = 1.1 -> 1.2 temperature too high
Dec 18 1995 04:03:09:350PM	951218029	John Goetz	Shot 951218029: more PG3 between 0.2 and 0.5 Results: plasma - disrupts @ 1.44 density acceptable temperature too low
Dec 18 1995 04:26:50:290PM	951218030	John Goetz	Shot 951218030: a pinch more RF power Results: plasma - disrupts @ 1.46 almost have a good match to previous dimensionless parameters
Dec 18 1995 04:41:51:680PM	951218031	John Goetz	Shot 951218031: a pinch more RF power Results: plasma - disr. @ 1.45 good match to previous dimensionless parameters
Dec 18 1995 05:00:33:180PM	951218032	John Goetz	Shot 951218032: IP = -715000 NL04 = 1.42e20 PG3 = 46V Results: plasma - disr. @ 1.47 density doesn't rise fast enough not much right on this shot
Dec 18 1995 05:06:08:650PM	951218033	John Goetz	Shot 951218033: load 951212017 for fiducial shot Results: strong fizzle too much Br
Dec 18 1995 05:29:16:420PM	951218034	John Goetz	Shot 951218034: BR_0 = .0064 Results: plasma - all the way down acceptable fiducial

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:33:24:380AM	Test	Ok
2	08:48:40:500AM	Test	Ok
3	09:02:59:040AM	Plasma	Ok
4	09:15:52:510AM	Plasma	Ok
5	10:04:57:030AM	Plasma	Ok
6	10:16:27:570AM	Plasma	Ok
7	10:34:15:910AM	Plasma	Ok
8	10:52:41:350AM	Plasma	Ok
9	11:08:13:950AM	Plasma	Ok
10	11:32:07:880AM	Plasma	Ok
11	11:45:13:150AM	Plasma	Ok
12	11:58:12:960AM	Plasma	Ok
13	12:09:59:690PM	Plasma	Ok
14	12:19:03:120PM	Plasma	Ok
15	12:31:45:780PM	Plasma	Ok
16	12:43:30:890PM	Plasma	Ok
17	12:55:49:550PM	Plasma	Ok
18	01:13:12:080PM	Plasma	Ok
19	01:27:58:790PM	Plasma	Ok
20	01:42:43:870PM	Plasma	Ok
21	02:07:48:900PM	Plasma	Ok
22	02:22:24:360PM	Plasma	Ok
23	02:32:48:930PM	Plasma	Ok
24	02:46:39:550PM	Plasma	Ok
25	03:03:42:680PM	Plasma	Ok
26	03:16:21:480PM	Plasma	Ok
27	03:28:39:030PM	Plasma	Ok
28	03:42:04:820PM	Plasma	Ok
29	03:55:27:930PM	Plasma	Ok
30	04:06:37:470PM	Plasma	Ok
31	04:30:53:100PM	Plasma	Ok
32	04:45:26:720PM	Plasma	Ok
33	05:01:00:810PM	Plasma	Ok
34	05:11:47:370PM	Plasma	Ok