Alcator C-Mod Run 960201 Information

Miniproposals

Miniproposal:

Date Filed:

Title:

First Author:

Session Leader: Jeff Schachter (shots 1-34)

Operators
Session leader(s):	Jeff Schachter
Physics operator(s):	Steve Wolfe
Engineering operator(s):	Frank Silva,Vinny Bertolino,Joe Daigle

Engineering Operator Run Comment
wolfe/schacter

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:15:053PM

Author: To Be Determined

Run Summary for MP 122A - Rho-Star Scaling - 96.02.01 - Jeff Schachter
======================================================================

This run was a continuation from 95.12.18. The mission today was to fill in
the L-mode data at 5.3 T and 2.6 T for as many parameter ranges as possible.
(In the first run, we identified four different L-Mode regimes at 2.6 T that
can be scaled up to 5.3 T. I label the regimes A-D.) We also attempted to get
some H-mode plasmas suitable for rho-star scaling analysis.

Neither goal was completely achieved. We were plagued by H-modes, Marfes and
shark fins, and fizzles. See the LOGBOOK under the SESSION_LEADER topic for
shot-to-shot details (note that the rhostar and nustar values I include in the
tables are not dimensionally correct). Also see the Physop's insightful
comments. Here, I'll summarize each task individually.

1) 5.3 T, group A Attempt: shots 2-8 Useful: 7

Parameters required:

Ip = 620 kA
NL04 = 1.1 e20
Te0(ECE) = 1.5 keV
Prf = 0.8 MW or even a bit higher

These parameters were already achieved on 95.12.18 (viz shot 951218031). I
wanted to rerun this to get a better match to 2.6 T by slightly raising the
temperature and lowering the density. Shots 2 and 5 went poloidally detached,
possibly from too much argon. This did not happen on 95.12.18, so boronization
is a reasonable suspect for the difference. 3, 4, and 6 were good, but no
argon means no Hirex measurements. 7 may be the best candidate. 8 showed
signs of an H-mode in the divertor H-alpha.

2) 5.3 T, group D Attempt: shots 9-11 Useful: none

Parameters required:

Ip = 815 kA
NL04 = 1.15 e20
Te0(ECE) = 2.0 keV
Prf = ?

With 0.8 MW RF on shot 9, we got H-mode, Te0=1.5 keV. Lowering the RF power by
shot 11 avoided the H-mode, but didn't allow enough heating to reach the
required temperature. We will need to go to reversed field to get L-mode data
for this regime.

3) 2.6 T, group A Attempt: 12-14 Useful: 12,14?

Parameters required:

Ip = 300 kA
NL04 = 0.44 e20
Te0(YAG) = 0.95 keV

This was a rerun of shot 951218022 (and several other shots on 95.12.18). I
wanted to do this to determine if boronization had any effect. It may have -
we couldn't run the density low enough. We were getting NL04's of 0.48-0.50,
when we needed 0.44 e20.

4) 2.6 T, group D Attempt: 15-24 Useful: 19? 21,24?

Parameters required:

Ip = 400 kA
NL04 = 0.44 e20
Te0(YAG) = 1.2 keV

We had one shot in this parameter range from last run: 951218016. We were
once again unable to get the density low enough. 21 and 24 have NL04's of 0.6
e20, which fits with the parameter range of group C. I'll need to check the
nustar's and betap's for these shots. (We only had once good shot from
last run for group C as well: 951218017.)

5) 2.6 T, H-Mode (D) Attempt: 25-29 Useful: none

The H-modes from part (2) of this run (5.3 T, group D) looked like they were
cold enough to scale down to 2.6 T (Te0 at 5.3 T was 1.5 keV). This we tried
in shots 25-29. Unfortunately, we couldn't get H-mode, likely because the RF
heating was poor for these plasmas.

6) 2.6 T, H-mode (960118033) Attempt: 30-32 Useful: 30-32

960118033 had H-modes that looked like they could be scaled up to 5.3 T,
especially if we could heat them more. We did get slightly hotter H-modes, but
tuning problems with the D-port transmitter limited our heating ability. I
believe if we rerun these with better tuning, we can get them hot enough to
scale (need Te0 > 1.2 keV). We'll try again next run.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:55:990PM

Author: To Be Determined

Physics Operator Summary for 960201

MP#122A Rho* scaling
SL: Schachter
PO: Wolfe
EO: Silva/Bertolino/Daigle

This run was a continuation of the first rho-star scaling run, 18-DEC-1995.

In the first run, we identified four different L-Mode regimes at 2.6 T that
can be scaled up to 5.3 T. We attempted to complete the scans for as many of
the four regimes as possible. We will also intended to do a rho-star scan for
H-Mode (this was not in the original miniproposal).

The plan was to do the following:

1. Fiducial shot
2. Get profile data for the 5.3T, Group A dataset (5 shots)
Based on 951218031
Ip=620kA
NL04=1.1e20
Te0(ECE) = 1.5keV
Prf .ge. 0.8MW
3. Get profile data on 5.3T, Group B dataset (5shots)
Ip=815kA
NL04=1.15e20
Te0(ECE)=1.98
Prf=?
Pinput=2.2MW (L-mode)
4. Reproduce 2.6T Group A (1shot) to check boronization effect
Based on 951218022
Ip=300kA
NL04=.44e20
Te0(YAG)=0.97
Prf=0
5. Get profile data for 2.6T Group D (3 shots)
Based on 951218016
Ip=400kA
NL04=0.44e20
Te0(YAG)=1.2keV
Prf=0
6. 2.6T H-mode
Based on 960118033 (With RF, D(H) mix, 2nd harmonic H)

7. 5.3T H-mode
Ip=985kA
NL04=1.8e20
Te0(ECE)=1.4 (at L-H transition)
Prf=?
8. 5.3T Group B
Ip=710kA
NL04=1.37e20
Te0=1.5
Prf=?
Pin = 2.0MW (L-mode)
9. Final fiducial

While it was expected we would not complete this long list, we actually got
even less than anticipated. The fiducials went well.

The first group, GroupA at 5.3T, suffered from shark-fins and/or Marfes when
Argon was injected in the ohmic phase; these were characterized by increases
in prad and ne, and were at first mistaken for h-modes, but it was later
pointed out that the outer divertor halpha and the f-side array showed
increased recycling, unlike the h-port main halpha view. We got rid of this
by reducing the Argon pressure and moving the Ar puff to be just before the
RF. The useable shots are 6-8.

Moving to group D, at 5T and 815kA, we were unable to avoid H-mode. This group
was abandoned after shot#11, and we went on to the 2.6T cases.

There was considerable difficulty getting the density down to the desired
level of 0.44e20 on the 2.6T cases. Shots 12 and 14 were more or less
acceptable for Group A.

Group D at 400kA proved to be a real bear. Aside from fizzles and disruptions,
and one power supply-induced dud, there was great irreproducibility in getting
the density, which varied between 3.5 and 6e19 while trying for 4.4e19.
Fortunately, there was another Group (C) not on the original program, for
which the higher density shots qualified.

We called a strategic retreat after shot 24 and upped the density to .7-.8e20
for an un-scripted try for H-mode at 2.6T. Shots 25 and 26 were done with D2
puffing. On 27 we started using a 60/40 D2/H2 mix in the plenum. No H-modes
were obtained at this current, although 29 had a density increase during the
RF, but no halpha drop.

Back on the script, more or less, we loaded 960118033, a .55MA shot which had
produced an H-mode on Yuichi's run. Shots 30,31,32 were good h-modes of this
set.

In order to use the diamagnetic change in slope to estimate the absorbed power
on these shots, we took a baseline shot on #33 by turning off the fizzle
detector to the TF only.

Shot 34 was a final fiducial, which went well, producing an h-mode during the
rf; this presumably indicates the h fraction had not gotten too high on the
walls.

Other observations:
--------------------
Running low density is hard. Whether this is due to the boronized walls or
just incompetence of the operator is unclear.

Fizzles returned. I think some of these were due to pre-pulse differences with
the varying wall loadings. The original shots were set up at high pre-puff,
which seemed to be a problem early in the run. However, late in the run I
ended up going back to rather long pre-pulses to get rid of the fizzles. Nulls
didn't look bad, and I suspect the field tweaks I did were irrelevant.

The YAG analysis program has a logic error that causes it to do the wrong
thing when the plasma lasts longer than 10240 samples of magnetics data,
which presently corresponds to a little over 1.7 sec. Finding and dealing with
this cost us some time, as we were running shots longer than that in the 5T
cases, and we expected to be relying on the YAG at 2.6T. There were also
difficulties with the YAG hardware that took some time for Ed to track down.

A Green button on the PLC screen does not mean the TF is under hybrid control
(shot 2).

There were cooling problems in the morning. It looks like the central column
cooling is causing LN2 to pour out of B-port, resulting in a leak. It is
possible that the sump filter is getting clogged, causing LN2 to back up in
the cryostat.

There were problems after many changes in plenum contents with the plenum #6
valve being in an inconsistent (red) state. This would cause faults, in some
cases during the state cycle. Apparently a limit indicator switch is faulty.

We had a couple of cases of EF1U being driven to +6kA at the end of the shot,
which caused a fault condition and a crowbar. This was a known problem and was
due to an incorrect setting in the supply. Since we are expecting to need to
push the EF1 supplies to this range in the future, the engineers went ahead
after shot 7 and reset this trip to 7.5kA, which is currently the
administrative limit on this coil.

The early ramp-down disruptions on the .55MA, 2.6T shots were probably due to
q=3, as the plasma shrank faster than the ramp-down rate, causing q to drop
from 3.3 to near 3.0. I tried fixing this on shot 32, but may have screwed
something up as it disrupted sooner.

Scorecard:
----------
Shots 34
Plasmas 28
Fizzles 4
Duds 1 (EF2 supply)
Baseline 1

Session Leader Comments

Feb 1 1996 09:31:40:420AM 960201002 Jeff Schachter Power supply setting problems. Indications of an ohmic H-mode before
disruption. Hope this doesn't happen again.

Feb 1 1996 09:43:00:730AM 960201003 Jeff Schachter Much better. Proper parameters. RF power a bit too high, so temperature
may be slightly too high. YAG still not working. Assume Zeff=1.5

using ece for Te

Shot: 960201003 Time: 0.750000 Window: 0.0500000
Bt = 5.30 T Ip = 0.63 MA Te = 1.67 keV Pin = 1.63 MW
NL04 = 1.13 Nebar = 1.87
a = 22.0102 Zeff = 1.50

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.310035 0.438411 1.03852 0.391389
3.50000 0.417355 0.651640 1.26612 0.709247
5.30000 0.631995 1.13314 1.66961 1.62635
8.00000 0.953955 1.96202 2.19697 3.70546

RHOSTAR: 0.0110766 NUSTAR: 13.4206 BETAP: 0.0673516

next: lower RF power by 10%

Feb 1 1996 09:47:38:310AM 960201004 Jeff Schachter fizzle.

Feb 1 1996 10:10:44:100AM 960201005 Jeff Schachter Ohmic H-Mode at 0.45 s - stays in H-mode thru RF. Therefore not usable
for rhostar scaling. This shot had Ar for Hirex. Was this the cause
of the H-mode?

next: same as 005, without Ar

Feb 1 1996 11:03:31:560AM 960201006 Jeff Schachter Golden! No Ar so no Hirex. Te is perfect. Using Z_67 (not YAG). YAG
Te0 is good.

Shot: 960201006 Time: 0.900000 Window: 0.200000
Bt = 5.30 T Ip = 0.63 MA Te = 1.59 keV Pin = 1.53 MW
NL04 = 1.17 Nebar = 1.93
a = 22.0213 Zeff = 1.41

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.309600 0.450700 0.988642 0.367266
3.50000 0.416769 0.669906 1.20532 0.665534
5.30000 0.631108 1.16491 1.58943 1.52611
8.00000 0.952615 2.01702 2.09146 3.47708

RHOSTAR: 0.0107994 NUSTAR: 14.2901 BETAP: 0.0659144

next: again, with some Ar - hopefully no marfes (which, BTW, the events
in 2 and 5 actually were)

Feb 1 1996 11:16:08:310AM 960201007 Jeff Schachter Another beaut. Ar this time for Ti - after 0.7 s - low signal. No YAG.
Density (NL04 and nebar) marginally higher.

Shot: 960201007 Time: 0.900000 Window: 0.200000
Bt = 5.30 T Ip = 0.63 MA Te = 1.52 keV Pin = 1.59 MW
NL04 = 1.21 Nebar = 2.10
a = 22.0306 Zeff = 1.40

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.308038 0.468388 0.947336 0.383372
3.50000 0.414667 0.696198 1.15496 0.694720
5.30000 0.627924 1.21063 1.52302 1.59303
8.00000 0.947810 2.09618 2.00408 3.62956

RHOSTAR: 0.0105691 NUSTAR: 16.1151 BETAP: 0.0656393

next: once more for Ti, then onto group D

Feb 1 1996 11:34:50:270AM 960201008 Jeff Schachter YAG back - good Te. Density was lowered slightly from 7 - better now.
Should have enough for Ti profiles.

Shot: 960201008 Time: 0.900000 Window: 0.200000
Bt = 5.30 T Ip = 0.63 MA Te = 1.58 keV Pin = 1.53 MW
NL04 = 1.18 Nebar = 2.10
a = 22.0568 Zeff = 1.53

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.309301 0.456555 0.982746 0.367116
3.50000 0.416367 0.678608 1.19813 0.665262
5.30000 0.630499 1.18004 1.57995 1.52549
8.00000 0.951696 2.04322 2.07899 3.47566

RHOSTAR: 0.0107505 NUSTAR: 15.9336 BETAP: 0.0663724

next: group D

Feb 1 1996 11:49:03:170AM 960201009 Jeff Schachter Definite H-Mode. YAG analysis problem. This may scale for H-Mode
rho-star. Right gap dropped (1.4 -> 0.7).

Shot: 960201009 Time: 0.975000 Window: 0.0750000
Bt = 5.30 T Ip = 0.80 MA Te = 1.43 keV Pin = 1.70 MW
NL04 = 1.89 Nebar = 3.09
a = 22.2972 Zeff = 1.23

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.391835 0.729296 0.890056 0.408037
3.50000 0.527470 1.08400 1.08513 0.739415
5.30000 0.798740 1.88498 1.43093 1.69552
8.00000 1.20565 3.26382 1.88291 3.86307

RHOSTAR: 0.0101190 NUSTAR: 25.3162 BETAP: 0.0960229

next: lower power to see if can get out of H-Mode, increase right gap

Feb 1 1996 12:15:35:490PM 960201010 Jeff Schachter YAG still giving problems. H-mode! Lowering power won't help, as need
Te=2.0 keV for L-Mode scaling. This may be useful for 2.6 T H-mode
scaling.

Shot: 960201010 Time: 0.975000 Window: 0.0750000
Bt = 5.30 T Ip = 0.80 MA Te = 1.41 keV Pin = 1.49 MW
NL04 = 1.83 Nebar = 2.85
a = 22.1497 Zeff = 1.34

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.391788 0.707893 0.873668 0.359195
3.50000 0.527407 1.05219 1.06515 0.650908
5.30000 0.798645 1.82966 1.40459 1.49257
8.00000 1.20550 3.16803 1.84824 3.40066

RHOSTAR: 0.0100904 NUSTAR: 27.5937 BETAP: 0.0914887

Feb 1 1996 12:27:15:850PM 960201011 Jeff Schachter Lowered RF power even more. No H-Mode. Te too low for group D

Shot: 960201011 Time: 0.975000 Window: 0.0750000
Bt = 5.30 T Ip = 0.80 MA Te = 1.46 keV Pin = 1.45 MW
NL04 = 1.27 Nebar = 2.14
a = 22.0186 Zeff = 1.39

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.389860 0.490515 0.909724 0.349005
3.50000 0.524812 0.729086 1.10910 0.632442
5.30000 0.794715 1.26782 1.46255 1.45023
8.00000 1.19957 2.19520 1.92451 3.30419

RHOSTAR: 0.0103599 NUSTAR: 18.1941 BETAP: 0.0660109

Feb 1 1996 12:44:36:630PM 960201012 Jeff Schachter Checking 951218022. Density about 10% too high.

Shot: 960201012 Time: 1.10000 Window: 0.300000
Bt = 2.57 T Ip = 0.30 MA Te = 0.87 keV Pin = 0.41 MW
NL04 = 0.50 Nebar = 0.78
a = 21.6485 Zeff = 2.20

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.302810 0.503396 0.876937 0.415398
3.50000 0.407629 0.748232 1.06913 0.752755
5.30000 0.617267 1.30111 1.40984 1.72611
8.00000 0.931723 2.25285 1.85515 3.93276

RHOSTAR: 0.0167466 NUSTAR: 31.1315 BETAP: 0.0653027

Feb 1 1996 12:45:30:020PM 960201013 Jeff Schachter Disruption

Feb 1 1996 01:10:56:380PM 960201014 Jeff Schachter Ok for group A

Shot: 960201014 Time: 1.10000 Window: 0.300000
Bt = 2.58 T Ip = 0.30 MA Te = 0.87 keV Pin = 0.41 MW
NL04 = 0.46 Nebar = 0.86
a = 21.6921 Zeff = 2.74

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.302490 0.466249 0.878184 0.419693
3.50000 0.407198 0.693018 1.07065 0.760538
5.30000 0.616614 1.20510 1.41184 1.74396
8.00000 0.930739 2.08661 1.85779 3.97342

RHOSTAR: 0.0167111 NUSTAR: 35.9544 BETAP: 0.0605699

Feb 1 1996 01:30:08:630PM 960201015 Jeff Schachter Doing group D now - reload 951218016.
NL04 too high and rising. No H-Mode.

Shot: 960201015 Time: 1.10000 Window: 0.300000
Bt = 2.58 T Ip = 0.40 MA Te = 0.93 keV Pin = 0.54 MW
NL04 = 0.56 Nebar = 0.94
a = 22.4028 Zeff = 2.18

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.402792 0.567986 0.934613 0.547101
3.50000 0.542220 0.844236 1.13945 0.991419
5.30000 0.821076 1.46805 1.50257 2.27338
8.00000 1.23936 2.54191 1.97716 5.17966

RHOSTAR: 0.0167022 NUSTAR: 31.6965 BETAP: 0.0785276

Feb 1 1996 01:30:20:710PM 960201016 Jeff Schachter fizzle

Feb 1 1996 01:49:25:300PM 960201017 Jeff Schachter disruption

Feb 1 1996 01:49:37:470PM 960201018 Jeff Schachter fizzle

Feb 1 1996 02:02:39:860PM 960201019 Jeff Schachter plasma - density about 10% too high. Te too low - 1.0 keV
should be NL04=0.44, Te0=1.2; This is 0.48 and 1.0 respectively.

next: try again

Shot: 960201019 Time: 1.10000 Window: 0.300000
Bt = 2.57 T Ip = 0.40 MA Te = 0.93 keV Pin = 0.54 MW
NL04 = 0.47 Nebar = 0.74
a = 22.4503 Zeff = 2.79

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.405064 0.479073 0.931504 0.547677
3.50000 0.545278 0.712079 1.13566 0.992463
5.30000 0.825707 1.23824 1.49757 2.27578
8.00000 1.24635 2.14400 1.97059 5.18511

RHOSTAR: 0.0166473 NUSTAR: 34.5794 BETAP: 0.0660146

Feb 1 1996 02:03:38:990PM 960201020 Jeff Schachter disruption

Feb 1 1996 02:22:03:890PM 960201021 Jeff Schachter No EFIT - density looks like its good for group C

Feb 1 1996 02:26:45:550PM 960201022 Jeff Schachter DUD - EF2 problem.

WHAT DOES IT TAKE TO GET SOME PLASMA AROUND HERE??????

Feb 1 1996 02:42:58:870PM 960201023 Jeff Schachter injection @ 0.83 which causes disruption 0.92. Ne ok now, but Te too
low (what is going on here?

Shot: 960201023 Time: 0.850000 Window: 0.0500000
Bt = 2.58 T Ip = 0.39 MA Te = 0.83 keV Pin = 0.60 MW
NL04 = 0.45 Nebar = 0.75
a = 22.1442 Zeff = 1.87

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.396649 0.457449 0.836374 0.609025
3.50000 0.533950 0.679937 1.01968 1.10363
5.30000 0.808553 1.18235 1.34463 2.53070
8.00000 1.22046 2.04722 1.76934 5.76591

RHOSTAR: 0.0159739 NUSTAR: 27.1213 BETAP: 0.0565974

next: one more time, then onto H-Mode

Feb 1 1996 02:54:55:200PM 960201024 Jeff Schachter More like group C. But we got plasma.
Z_67 no show - guess 2.0

Shot: 960201024 Time: 1.10000 Window: 0.300000
Bt = 2.57 T Ip = 0.40 MA Te = 0.86 keV Pin = 0.54 MW
NL04 = 0.56 Nebar = 1.05
a = 22.4241 Zeff = 2.00

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.403053 0.571560 0.864027 0.553458
3.50000 0.542571 0.849549 1.05339 1.00294
5.30000 0.821608 1.47729 1.38909 2.29980
8.00000 1.24016 2.55790 1.82784 5.23984

RHOSTAR: 0.0160488 NUSTAR: 34.3362 BETAP: 0.0730538

Feb 1 1996 03:06:17:080PM 960201025 Jeff Schachter try "H-mode" conditions - shot 960201009 scaled down to 2.6:
Ip=400 kA, NL04 = 0.73, Te=0.89

Got: Ip droops. NL04=0.8 Te0=0.7

Shot: 960201025 Time: 1.10000 Window: 0.300000
Bt = 2.57 T Ip = 0.38 MA Te = 0.69 keV Pin = 0.69 MW
NL04 = 0.81 Nebar = 1.38
a = 22.0181 Zeff = 1.20

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.384286 0.820166 0.698325 0.704279
3.50000 0.517308 1.21907 0.851375 1.27625
5.30000 0.783352 2.11985 1.12269 2.92651
8.00000 1.18242 3.67049 1.47730 6.66773

RHOSTAR: 0.0146957 NUSTAR: 44.4751 BETAP: 0.0847253

Feb 1 1996 03:17:17:290PM 960201026 Jeff Schachter Ask: Lower ne, RF 1.1-1.4s
Get: same ne, not very much RF

Shot: 960201026 Time: 1.10000 Window: 0.300000
Bt = 2.58 T Ip = 0.38 MA Te = 0.67 keV Pin = 0.67 MW
NL04 = 0.80 Nebar = 1.33
a = 22.0479 Zeff = 1.26

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.384884 0.814475 0.673598 0.687654
3.50000 0.518113 1.21061 0.821229 1.24612
5.30000 0.784572 2.10514 1.08294 2.85743
8.00000 1.18426 3.64502 1.42499 6.51033

RHOSTAR: 0.0144073 NUSTAR: 49.9601 BETAP: 0.0811581

next: put in Hydrogen, so can RF heat. Try to get as much power in as
possible to up the temperature. May need to bring down density even
more to (1) get into H-Mode easier, and (2) get the density right during
H-Mode.

Feb 1 1996 03:32:50:360PM 960201027 Jeff Schachter Add H2 for heating. Also try to lower NL04.

Didn't get lower NL04. Better RF. No heating.
NL04 ~ 0.8, Te0(YAG) ~ 0.8

Feb 1 1996 03:56:37:720PM 960201028 Jeff Schachter Try again - FIZZLE

Feb 1 1996 04:16:34:100PM 960201029 Jeff Schachter Try again - over 1.5 MW RF. MARFE. NL04 preRF was lower - 0.6e20.
No heating.

Next: Give up on this one, move to reproduce 960118033 - and try to heat

Feb 1 1996 04:32:09:040PM 960201030 Jeff Schachter try to reproduce 960118033 - worked!!! Beautiful ELMy H-Modes!!!

One transmitter tripping. But got more heating than on the 18th, and
Te0_YAG is up (to 1.3).

Shot: 960201030 Time: 0.900000 Window: 0.100000
Bt = 2.58 T Ip = 0.57 MA Te = 1.07 keV Pin = 2.72 MW
NL04 = 1.21 Nebar = 2.01
a = 22.3552 Zeff = 1.39

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.572952 1.21887 1.07783 2.76450
3.50000 0.771282 1.81169 1.31406 5.00963
5.30000 1.16794 3.15037 1.73282 11.4874
8.00000 1.76293 5.45482 2.28015 26.1728

RHOSTAR: 0.0179563 NUSTAR: 32.5453 BETAP: 0.194341

Feb 1 1996 05:11:54:480PM 960201031 Jeff Schachter another attempt... got RF but can't see data
Heating ok.

WIll post stats when RF data is fixed.

Feb 1 1996 05:09:39:360PM 960201032 Jeff Schachter D port not available - didn't wait for the RF people to tune (oops).
Heating therefore not as good. Te ~ 1.2 keV max.

Shot: 960201032 Time: 0.991500 Window: 0.108500
Bt = 2.58 T Ip = 0.55 MA Te = 0.93 keV Pin = 2.15 MW
NL04 = 1.13 Nebar = 1.96
a = 22.3756 Zeff = 1.32

FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW)
--------- -------- ------------ -------- -----------
2.60000 0.556472 1.14177 0.937766 2.18497
3.50000 0.749097 1.69709 1.14329 3.95945
5.30000 1.13435 2.95109 1.50763 9.07927
8.00000 1.71222 5.10977 1.98383 20.6861

RHOSTAR: 0.0167446 NUSTAR: 38.4454 BETAP: 0.158390

Feb 1 1996 05:12:33:470PM 960201033 Jeff Schachter Baseline shot for diamagnetic loops - need to get better measurement
of absorbed power - NO PLASMA

Feb 1 1996 05:12:55:920PM 960201034 Jeff Schachter Fiducial - as shot 960201001

Physics Operator Comments

Feb 1 1996 07:06:00:560AM Steve Wolfe Run 960201
MP# 122A
SL: Schachter
PO: wolfe

Engineering setup:
------------------
No ECDC

A-side 20psi D2
B-top 5psi D2
B-side lower 4psi Ar

Fiducial setup as on 960131001 (do not enable Ar)
After Fiducial start with setup from 951218031
Enable A-side,B-top,B-side lower.
TF on Hybrid control.
Experimental plan:
------------------
This run will be a continuation of the first rho-star scaling run, 18-DEC-1995.

In the first run, we identified four different L-Mode regimes at 2.6 T that
can be scaled up to 5.3 T. I label the regimes A-D. We will attempt to
complete the scans for as many of the four regimes as possible.

We will also try to do a rho-star scan for H-Mode (this was not in the original
miniproposal).

Feb 1 1996 07:45:30:330AM Steve Wolfe Fiducial shot loaded from 960131001 last night.
Coldstart ok at 1-FEB-1996 06:53:19.65

951218031 loaded into PCS (for after fiducial) last night.
The first group of shots is described by Jeff as:
* 5.3 T, group A 5 shots

reload shot 951218031. try to hold NL04 at 1.1e20 (good period=0.72-0.80).
Looking for:

Ip = 620 kA
NL04 = 1.1 e20
Te0(ECE) = 1.5 keV
Prf = 0.8 MW or even a bit higher

Run for Ti from Hirex

Start by rerunning 951218031 as is. Unfortunately, the density on that shot
ramped up over the time range of interest. If we can reproduce the shot on
960201, we should attempt to hold the density flat at 1.1e20. There was a
brief flattop in 951218031 between 0.72s and 0.80s which may help in
determining the proper settings for 960201. Once we can reliably obtain the
proper density, rerun 3-4 times to get Hirex profiles.
**********************************************************************
Looking at the shot in question, the density ramp he is complaining
about seems to be from 1.09 to 1.16e20! The programming was for 1.25 and
it was trying to reach it. John was playing a lot with PG3 feed-forward
on that sequence, and I may need to do the same if he really cares about
10% changes. I also note that the current waveform is drawn as a ramp
from 615kA to 635, to end up with Ip nearly flat around 620kA.

Feb 1 1996 08:08:50:450AM Steve Wolfe 960201 0805h: They are having some difficulty cooling down, as a leak
opens up when they turn on the cooling, even at 5pounds. There is an
LN2 leak especially around B-port, which is the suspected site of the
vacuum problem. The TF arms are essentially cold, but the core is still
high by 20C and some PF coils ate warm.

Feb 1 1996 08:50:35:030AM 960201001 Steve Wolfe Shot 960201001 - fiducial (from 960131001) : PLasma looked good.
Irby noted that water came up on the RGA about 2sec before the shot.
All gate valve systems appear to have good pressure, so its not clear
where it came from. Fiducial shot loked ok.

Feb 1 1996 09:26:53:960AM 960201002 Steve Wolfe Shot 960201002
Start of MP122A: Load 951218031 with no changes

Disrupted at 0.5sec ?
TF wasn't on hybrid control, so it went to 156kA (setting 160) instead
of 145.
Might have died from an injection.
It looks resistive.
ELM free ohmic H-mode starting at .43 sec! Radiation starts up so we
must be accumulating impurities.
It looks like EF1U is misbehaving , giving more voltage than requested
during the same timne as the H-mode.
JR reports he may have too much Argon for this current; presumably
H-mode accumulation. Turn it off until we establish the shot.

Feb 1 1996 09:36:13:050AM 960201003 Steve Wolfe Shot 960201003
Turn off Argon. TF really on Hybrid control this time.
FS is looking at the EF1 problem as we run this one.

Plasma full length (1.7sec).
No H-mode. density rising a bit during flattop, also current rising
2Pi bolo says 50kW ohmic, 100kW RF (at 1MW)
35kJ. Grating TE0 seems to be set wrong, Michelson says 1.65keV

Feb 1 1996 09:50:53:480AM 960201004 Steve Wolfe Shot 960201004
Reduce programmed Ip ramp Drop last NL04 point to 1.1 (what we want)
Drop RF power a little.

fizzle

Feb 1 1996 10:09:37:460AM 960201005 Steve Wolfe Shot 960201005
Reduce pre-pulse from 18msec to 14msec
Br may be a tad negative, but leave it alone for now.

Plasma full length, PF crowbar at end.
Ohmic H-mode again! It goes in after the Argon pulse. Maybe the increased
ohmic power is enough to kick it into H-mode?
Try turning it off with no other changes.
EF1 blew fuses this time, some delay to check and fix.

Feb 1 1996 11:00:31:340AM 960201006 Steve Wolfe Shot 960201006
Repeat except no Ar.
Thomson laser may have also blown a fuse. Ed is checking before this shot.

Snipes & Stek say 2 and 5 are not H-modes. They hve big MARFEs and may be
shark-fin effects.

Plasma-no fin or H or whatever. Jeff says it's golden.

Feb 1 1996 11:16:36:080AM 960201007 Steve Wolfe Shot 960201007

Reducxe Argon to 2.16lbs and move argon pulse to .6sec.
Otherwise repeat to start profile scan.

Plasma- EF1U crowbars again at end, killing plasma. It seems the current
is hitting the 6KA level at which it faults. Joe Daigle will fix this.
I'll see about the rampdown.

Feb 1 1996 11:49:20:580AM 960201009 Steve Wolfe Shot 960201009

Go to group D.
Raise current to 800kA
Extend ZCUR3 gain to 2 sec (was turning off at 1.6)

Plasma - H-mode.
Need to lower RF power.

Feb 1 1996 12:09:10:770PM 960201009 Steve Wolfe Shot 960201010

MOve RCUR in 2mm (gap was smaller)
Put bigger jog at 1.5 where I changed the offset

H-mode again.

Feb 1 1996 12:09:22:720PM 960201010 Steve Wolfe Shot 960201010

MOve RCUR in 2mm (gap was smaller)
Put bigger jog at 1.5 where I changed the offset

H-mode again.

Feb 1 1996 12:25:06:030PM 960201011 Steve Wolfe Shot 960201011

Try again at even lower power.
Still an H-mode.
The YAG analysis program bombs because the shots are too long and the
logic is screwy.

Feb 1 1996 12:32:30:590PM 960201012 Steve Wolfe Shot 960201012

Load 951218022. Reduce pre-puff back to 14msec.
This should be 2.6T, 300kA

Plasma- disrupts just into rampdown at around 1.6 sec. Any longer
and the YAG program will barf.
Jeff says density is 10% too high.

Feb 1 1996 12:34:48:690PM 960201012 Steve Wolfe Shot 960201012

Load 951218022. Reduce pre-puff back to 14msec.
This should be 2.6T, 300kA

Plasma- disrupts just into rampdown at around 1.6 sec. Any longer
and the YAG program will barf.
Jeff says density is 10% too high. The gas valve is off after .2sec

Feb 1 1996 12:51:09:390PM 960201013 Steve Wolfe Shot 960201013

Reduce early density demand. The flattop request is at .3 already.
Raise plenum pressure on Argon back to 4 lbs

Disruption. .45 sec. OH2L crowbarred before disruption.

Feb 1 1996 01:01:51:640PM 960201014 Steve Wolfe Shot 960201014

Argon pressure to 3 pounds (JR says signal was up by a factor of 6
last time).

PLasma - ok, move along to group D

Feb 1 1996 01:24:43:030PM 960201016 Steve Wolfe Shot 960201016

Reduce early density and force current to zero at 1.7sec
fizzle. Null looks ok, maybe a little negative Br.

Feb 1 1996 01:41:04:640PM 960201017 Steve Wolfe Shot 960201017

Drop pre-pulse to 12msec and increase Br from .0064 to .007
JR goes to cell to swap a CAMAC module.

Disrupted at .5sec.

Feb 1 1996 01:49:08:720PM 960201018 Steve Wolfe Shot 960201018

Put back some early density demand. I don't know why 17 disrupted.
It also had a pretty ratty breakdown.

fizzle.

Feb 1 1996 01:58:08:310PM 960201019 Steve Wolfe Shot 960201019

Drop pre-pulse to 11msec. Br looked still a bit negative.
Plasma- full length.
Density is 10% too high! Te is 20% too low.
A hint of hards early.

Feb 1 1996 02:21:05:670PM 960201021 Steve Wolfe Shot 960201021

INcrease NL04 program to 4e19

Plasma- Got 5.7e19!
Magnetics data corrupted (TRAQ2). EFIT bombed.

Feb 1 1996 02:25:32:560PM 960201022 Steve Wolfe Shot 960201022

Repeat. Jeff says this will qualify for Group C.

Dud. EF2L seems to have a problem.

Feb 1 1996 02:40:43:000PM 960201023 Steve Wolfe Shot 960201023

Try again.
Disrupts at 0.92. Possible injection.
The density was back down to .4 again., Jeff says Te is still too low.

Feb 1 1996 02:46:58:660PM 960201024 Steve Wolfe Shot 960201024

Try again.
Plasma- back at .56e20.

Feb 1 1996 02:59:03:600PM 960201025 Steve Wolfe Shot 960201025

Enough of this. Try raising density to 7.3e19 (ask for 8).
This is an unscripted attempt to get a 2.6T H-mode point.

Plasma- 8e19, and its cooooold

Feb 1 1996 03:08:58:050PM 960201026 Steve Wolfe Shot 960201026

Lower request to 7e19. Yuichi will fire RF at 1.1sec
Plasma- 8e19. RF didn't go.

Feb 1 1996 03:28:28:120PM 960201027 Steve Wolfe Shot 960201027

Lower request to 6e19. Yuichi will fire RF at 1.1sec
Start mixing in the plenum. Go to 12 psi D2, 8psi H2.

Plasma-Still getting 8e19. No H-mode, a little RF

Feb 1 1996 03:52:31:340PM 960201028 Steve Wolfe Shot 960201028

Turn off PG3 voltage after .5sec. Leave request at 6e19.
Backed out of the shot. Gas fill fault on A-side piezo (red indicator)
This was symptom before last week's TORVAC disaster. Bosco being called
by Irby.

Bosco thinks its not the same problem. Proceed after clearing.
fizzle.

Feb 1 1996 04:11:07:170PM 960201029 Steve Wolfe Shot 960201029

Go to 16msec prepulse.
Change EF4 from -1150 to -1130A

Plasma- RF causes a density increase, but Halpha goes up. No H-mode.
Density is now at 6e19.

Feb 1 1996 04:30:50:030PM 960201030 Steve Wolfe Shot 960201030

Load 960118033.
We are now back to .0066 on Br, -1150 on EF4, 11msec on the puff.
Also, these shots are shorter, Ip ramps down from 1.2sec

Plasma- H-modes, PF crowbar. Disrupts at 1.25s
Berakdown looks bad, try boosting the pre-pulse.

Feb 1 1996 04:36:04:510PM 960201031 Steve Wolfe Shot 960201031

Pre-pulse back to 14msec.

PLasma, H-modes, still disrupts, probably hitting q=3

Feb 1 1996 04:47:11:220PM 960201032 Steve Wolfe Shot 960201032

Extend shape programming into rampdown to try to keep it from shrinking
faster than the current rampdown. Also spped up the rampdown.

PLasma-disrupted a litle earlier, before any of my changes.

Feb 1 1996 04:52:44:440PM 960201033 Steve Wolfe Shot 960201033

Baseline shot for Granetz diamagnetic. Turn off gas and take
TF off fizzle detector.

Feb 1 1996 05:10:24:160PM 960201034 Steve Wolfe Shot 960201034

Fiducial:reload shot 1
Fiducial ok.

Engineering Operator Comments

Shot Time Type Status Comment

1 08:43:33:560AM Plasma Ok fiducial

2 09:01:53:340AM Plasma Ok

3 09:27:20:600AM Plasma Ok

4 09:44:27:160AM Plasma Ok

5 09:57:59:480AM Plasma Ok

6 10:50:31:900AM Plasma Ok

7 11:04:26:670AM Plasma Ok

8 11:23:08:410AM Plasma Ok

9 11:35:07:650AM Plasma Ok

10 11:51:12:110AM Plasma Ok

11 12:10:59:730PM Plasma Ok

12 12:28:27:790PM Plasma Ok

13 12:43:14:770PM Plasma Bad oh2l comm fault

14 12:58:06:120PM Plasma Ok

15 01:08:17:350PM Plasma Ok

16 01:17:37:410PM Plasma Ok

17 01:29:41:370PM Plasma Ok

18 01:41:35:870PM Plasma Ok

19 01:50:26:240PM Plasma Ok

20 02:01:33:210PM Plasma Ok

21 02:11:53:080PM Plasma Ok

22 02:22:28:750PM Plasma Ok

23 02:31:46:480PM Plasma Ok

24 02:43:10:780PM Plasma Ok

25 02:52:36:670PM Plasma Ok

26 03:03:27:590PM Plasma Ok

27 03:22:22:510PM Plasma Ok

28 03:32:58:080PM Plasma Ok

29 04:00:41:270PM Plasma Ok

30 04:20:50:790PM Plasma Ok Self powered c-bar OH2U.

31 04:32:44:290PM Plasma Ok

32 04:41:54:880PM Plasma Ok Self powered fired C-Bar OH2u&l.

33 04:50:39:520PM Plasma Ok

34 05:00:14:070PM Plasma Ok

Session Leader Comments
Feb 1 1996 09:31:40:420AM	960201002	Jeff Schachter	Power supply setting problems. Indications of an ohmic H-mode before disruption. Hope this doesn't happen again.
Feb 1 1996 09:43:00:730AM	960201003	Jeff Schachter	Much better. Proper parameters. RF power a bit too high, so temperature may be slightly too high. YAG still not working. Assume Zeff=1.5 using ece for Te Shot: 960201003 Time: 0.750000 Window: 0.0500000 Bt = 5.30 T Ip = 0.63 MA Te = 1.67 keV Pin = 1.63 MW NL04 = 1.13 Nebar = 1.87 a = 22.0102 Zeff = 1.50 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.310035 0.438411 1.03852 0.391389 3.50000 0.417355 0.651640 1.26612 0.709247 5.30000 0.631995 1.13314 1.66961 1.62635 8.00000 0.953955 1.96202 2.19697 3.70546 RHOSTAR: 0.0110766 NUSTAR: 13.4206 BETAP: 0.0673516 next: lower RF power by 10%
Feb 1 1996 09:47:38:310AM	960201004	Jeff Schachter	fizzle.
Feb 1 1996 10:10:44:100AM	960201005	Jeff Schachter	Ohmic H-Mode at 0.45 s - stays in H-mode thru RF. Therefore not usable for rhostar scaling. This shot had Ar for Hirex. Was this the cause of the H-mode? next: same as 005, without Ar
Feb 1 1996 11:03:31:560AM	960201006	Jeff Schachter	Golden! No Ar so no Hirex. Te is perfect. Using Z_67 (not YAG). YAG Te0 is good. Shot: 960201006 Time: 0.900000 Window: 0.200000 Bt = 5.30 T Ip = 0.63 MA Te = 1.59 keV Pin = 1.53 MW NL04 = 1.17 Nebar = 1.93 a = 22.0213 Zeff = 1.41 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.309600 0.450700 0.988642 0.367266 3.50000 0.416769 0.669906 1.20532 0.665534 5.30000 0.631108 1.16491 1.58943 1.52611 8.00000 0.952615 2.01702 2.09146 3.47708 RHOSTAR: 0.0107994 NUSTAR: 14.2901 BETAP: 0.0659144 next: again, with some Ar - hopefully no marfes (which, BTW, the events in 2 and 5 actually were)
Feb 1 1996 11:16:08:310AM	960201007	Jeff Schachter	Another beaut. Ar this time for Ti - after 0.7 s - low signal. No YAG. Density (NL04 and nebar) marginally higher. Shot: 960201007 Time: 0.900000 Window: 0.200000 Bt = 5.30 T Ip = 0.63 MA Te = 1.52 keV Pin = 1.59 MW NL04 = 1.21 Nebar = 2.10 a = 22.0306 Zeff = 1.40 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.308038 0.468388 0.947336 0.383372 3.50000 0.414667 0.696198 1.15496 0.694720 5.30000 0.627924 1.21063 1.52302 1.59303 8.00000 0.947810 2.09618 2.00408 3.62956 RHOSTAR: 0.0105691 NUSTAR: 16.1151 BETAP: 0.0656393 next: once more for Ti, then onto group D
Feb 1 1996 11:34:50:270AM	960201008	Jeff Schachter	YAG back - good Te. Density was lowered slightly from 7 - better now. Should have enough for Ti profiles. Shot: 960201008 Time: 0.900000 Window: 0.200000 Bt = 5.30 T Ip = 0.63 MA Te = 1.58 keV Pin = 1.53 MW NL04 = 1.18 Nebar = 2.10 a = 22.0568 Zeff = 1.53 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.309301 0.456555 0.982746 0.367116 3.50000 0.416367 0.678608 1.19813 0.665262 5.30000 0.630499 1.18004 1.57995 1.52549 8.00000 0.951696 2.04322 2.07899 3.47566 RHOSTAR: 0.0107505 NUSTAR: 15.9336 BETAP: 0.0663724 next: group D
Feb 1 1996 11:49:03:170AM	960201009	Jeff Schachter	Definite H-Mode. YAG analysis problem. This may scale for H-Mode rho-star. Right gap dropped (1.4 -> 0.7). Shot: 960201009 Time: 0.975000 Window: 0.0750000 Bt = 5.30 T Ip = 0.80 MA Te = 1.43 keV Pin = 1.70 MW NL04 = 1.89 Nebar = 3.09 a = 22.2972 Zeff = 1.23 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.391835 0.729296 0.890056 0.408037 3.50000 0.527470 1.08400 1.08513 0.739415 5.30000 0.798740 1.88498 1.43093 1.69552 8.00000 1.20565 3.26382 1.88291 3.86307 RHOSTAR: 0.0101190 NUSTAR: 25.3162 BETAP: 0.0960229 next: lower power to see if can get out of H-Mode, increase right gap
Feb 1 1996 12:15:35:490PM	960201010	Jeff Schachter	YAG still giving problems. H-mode! Lowering power won't help, as need Te=2.0 keV for L-Mode scaling. This may be useful for 2.6 T H-mode scaling. Shot: 960201010 Time: 0.975000 Window: 0.0750000 Bt = 5.30 T Ip = 0.80 MA Te = 1.41 keV Pin = 1.49 MW NL04 = 1.83 Nebar = 2.85 a = 22.1497 Zeff = 1.34 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.391788 0.707893 0.873668 0.359195 3.50000 0.527407 1.05219 1.06515 0.650908 5.30000 0.798645 1.82966 1.40459 1.49257 8.00000 1.20550 3.16803 1.84824 3.40066 RHOSTAR: 0.0100904 NUSTAR: 27.5937 BETAP: 0.0914887
Feb 1 1996 12:27:15:850PM	960201011	Jeff Schachter	Lowered RF power even more. No H-Mode. Te too low for group D Shot: 960201011 Time: 0.975000 Window: 0.0750000 Bt = 5.30 T Ip = 0.80 MA Te = 1.46 keV Pin = 1.45 MW NL04 = 1.27 Nebar = 2.14 a = 22.0186 Zeff = 1.39 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.389860 0.490515 0.909724 0.349005 3.50000 0.524812 0.729086 1.10910 0.632442 5.30000 0.794715 1.26782 1.46255 1.45023 8.00000 1.19957 2.19520 1.92451 3.30419 RHOSTAR: 0.0103599 NUSTAR: 18.1941 BETAP: 0.0660109
Feb 1 1996 12:44:36:630PM	960201012	Jeff Schachter	Checking 951218022. Density about 10% too high. Shot: 960201012 Time: 1.10000 Window: 0.300000 Bt = 2.57 T Ip = 0.30 MA Te = 0.87 keV Pin = 0.41 MW NL04 = 0.50 Nebar = 0.78 a = 21.6485 Zeff = 2.20 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.302810 0.503396 0.876937 0.415398 3.50000 0.407629 0.748232 1.06913 0.752755 5.30000 0.617267 1.30111 1.40984 1.72611 8.00000 0.931723 2.25285 1.85515 3.93276 RHOSTAR: 0.0167466 NUSTAR: 31.1315 BETAP: 0.0653027
Feb 1 1996 12:45:30:020PM	960201013	Jeff Schachter	Disruption
Feb 1 1996 01:10:56:380PM	960201014	Jeff Schachter	Ok for group A Shot: 960201014 Time: 1.10000 Window: 0.300000 Bt = 2.58 T Ip = 0.30 MA Te = 0.87 keV Pin = 0.41 MW NL04 = 0.46 Nebar = 0.86 a = 21.6921 Zeff = 2.74 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.302490 0.466249 0.878184 0.419693 3.50000 0.407198 0.693018 1.07065 0.760538 5.30000 0.616614 1.20510 1.41184 1.74396 8.00000 0.930739 2.08661 1.85779 3.97342 RHOSTAR: 0.0167111 NUSTAR: 35.9544 BETAP: 0.0605699
Feb 1 1996 01:30:08:630PM	960201015	Jeff Schachter	Doing group D now - reload 951218016. NL04 too high and rising. No H-Mode. Shot: 960201015 Time: 1.10000 Window: 0.300000 Bt = 2.58 T Ip = 0.40 MA Te = 0.93 keV Pin = 0.54 MW NL04 = 0.56 Nebar = 0.94 a = 22.4028 Zeff = 2.18 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.402792 0.567986 0.934613 0.547101 3.50000 0.542220 0.844236 1.13945 0.991419 5.30000 0.821076 1.46805 1.50257 2.27338 8.00000 1.23936 2.54191 1.97716 5.17966 RHOSTAR: 0.0167022 NUSTAR: 31.6965 BETAP: 0.0785276
Feb 1 1996 01:30:20:710PM	960201016	Jeff Schachter	fizzle
Feb 1 1996 01:49:25:300PM	960201017	Jeff Schachter	disruption
Feb 1 1996 01:49:37:470PM	960201018	Jeff Schachter	fizzle
Feb 1 1996 02:02:39:860PM	960201019	Jeff Schachter	plasma - density about 10% too high. Te too low - 1.0 keV should be NL04=0.44, Te0=1.2; This is 0.48 and 1.0 respectively. next: try again Shot: 960201019 Time: 1.10000 Window: 0.300000 Bt = 2.57 T Ip = 0.40 MA Te = 0.93 keV Pin = 0.54 MW NL04 = 0.47 Nebar = 0.74 a = 22.4503 Zeff = 2.79 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.405064 0.479073 0.931504 0.547677 3.50000 0.545278 0.712079 1.13566 0.992463 5.30000 0.825707 1.23824 1.49757 2.27578 8.00000 1.24635 2.14400 1.97059 5.18511 RHOSTAR: 0.0166473 NUSTAR: 34.5794 BETAP: 0.0660146
Feb 1 1996 02:03:38:990PM	960201020	Jeff Schachter	disruption
Feb 1 1996 02:22:03:890PM	960201021	Jeff Schachter	No EFIT - density looks like its good for group C
Feb 1 1996 02:26:45:550PM	960201022	Jeff Schachter	DUD - EF2 problem. WHAT DOES IT TAKE TO GET SOME PLASMA AROUND HERE??????
Feb 1 1996 02:42:58:870PM	960201023	Jeff Schachter	injection @ 0.83 which causes disruption 0.92. Ne ok now, but Te too low (what is going on here? Shot: 960201023 Time: 0.850000 Window: 0.0500000 Bt = 2.58 T Ip = 0.39 MA Te = 0.83 keV Pin = 0.60 MW NL04 = 0.45 Nebar = 0.75 a = 22.1442 Zeff = 1.87 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.396649 0.457449 0.836374 0.609025 3.50000 0.533950 0.679937 1.01968 1.10363 5.30000 0.808553 1.18235 1.34463 2.53070 8.00000 1.22046 2.04722 1.76934 5.76591 RHOSTAR: 0.0159739 NUSTAR: 27.1213 BETAP: 0.0565974 next: one more time, then onto H-Mode
Feb 1 1996 02:54:55:200PM	960201024	Jeff Schachter	More like group C. But we got plasma. Z_67 no show - guess 2.0 Shot: 960201024 Time: 1.10000 Window: 0.300000 Bt = 2.57 T Ip = 0.40 MA Te = 0.86 keV Pin = 0.54 MW NL04 = 0.56 Nebar = 1.05 a = 22.4241 Zeff = 2.00 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.403053 0.571560 0.864027 0.553458 3.50000 0.542571 0.849549 1.05339 1.00294 5.30000 0.821608 1.47729 1.38909 2.29980 8.00000 1.24016 2.55790 1.82784 5.23984 RHOSTAR: 0.0160488 NUSTAR: 34.3362 BETAP: 0.0730538
Feb 1 1996 03:06:17:080PM	960201025	Jeff Schachter	try "H-mode" conditions - shot 960201009 scaled down to 2.6: Ip=400 kA, NL04 = 0.73, Te=0.89 Got: Ip droops. NL04=0.8 Te0=0.7 Shot: 960201025 Time: 1.10000 Window: 0.300000 Bt = 2.57 T Ip = 0.38 MA Te = 0.69 keV Pin = 0.69 MW NL04 = 0.81 Nebar = 1.38 a = 22.0181 Zeff = 1.20 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.384286 0.820166 0.698325 0.704279 3.50000 0.517308 1.21907 0.851375 1.27625 5.30000 0.783352 2.11985 1.12269 2.92651 8.00000 1.18242 3.67049 1.47730 6.66773 RHOSTAR: 0.0146957 NUSTAR: 44.4751 BETAP: 0.0847253
Feb 1 1996 03:17:17:290PM	960201026	Jeff Schachter	Ask: Lower ne, RF 1.1-1.4s Get: same ne, not very much RF Shot: 960201026 Time: 1.10000 Window: 0.300000 Bt = 2.58 T Ip = 0.38 MA Te = 0.67 keV Pin = 0.67 MW NL04 = 0.80 Nebar = 1.33 a = 22.0479 Zeff = 1.26 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.384884 0.814475 0.673598 0.687654 3.50000 0.518113 1.21061 0.821229 1.24612 5.30000 0.784572 2.10514 1.08294 2.85743 8.00000 1.18426 3.64502 1.42499 6.51033 RHOSTAR: 0.0144073 NUSTAR: 49.9601 BETAP: 0.0811581 next: put in Hydrogen, so can RF heat. Try to get as much power in as possible to up the temperature. May need to bring down density even more to (1) get into H-Mode easier, and (2) get the density right during H-Mode.
Feb 1 1996 03:32:50:360PM	960201027	Jeff Schachter	Add H2 for heating. Also try to lower NL04. Didn't get lower NL04. Better RF. No heating. NL04 ~ 0.8, Te0(YAG) ~ 0.8
Feb 1 1996 03:56:37:720PM	960201028	Jeff Schachter	Try again - FIZZLE
Feb 1 1996 04:16:34:100PM	960201029	Jeff Schachter	Try again - over 1.5 MW RF. MARFE. NL04 preRF was lower - 0.6e20. No heating. Next: Give up on this one, move to reproduce 960118033 - and try to heat
Feb 1 1996 04:32:09:040PM	960201030	Jeff Schachter	try to reproduce 960118033 - worked!!! Beautiful ELMy H-Modes!!! One transmitter tripping. But got more heating than on the 18th, and Te0_YAG is up (to 1.3). Shot: 960201030 Time: 0.900000 Window: 0.100000 Bt = 2.58 T Ip = 0.57 MA Te = 1.07 keV Pin = 2.72 MW NL04 = 1.21 Nebar = 2.01 a = 22.3552 Zeff = 1.39 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.572952 1.21887 1.07783 2.76450 3.50000 0.771282 1.81169 1.31406 5.00963 5.30000 1.16794 3.15037 1.73282 11.4874 8.00000 1.76293 5.45482 2.28015 26.1728 RHOSTAR: 0.0179563 NUSTAR: 32.5453 BETAP: 0.194341
Feb 1 1996 05:11:54:480PM	960201031	Jeff Schachter	another attempt... got RF but can't see data Heating ok. WIll post stats when RF data is fixed.
Feb 1 1996 05:09:39:360PM	960201032	Jeff Schachter	D port not available - didn't wait for the RF people to tune (oops). Heating therefore not as good. Te ~ 1.2 keV max. Shot: 960201032 Time: 0.991500 Window: 0.108500 Bt = 2.58 T Ip = 0.55 MA Te = 0.93 keV Pin = 2.15 MW NL04 = 1.13 Nebar = 1.96 a = 22.3756 Zeff = 1.32 FIELD (T) IP (MA) NL04(e20/m3) TE (keV) PINPUT (MW) --------- -------- ------------ -------- ----------- 2.60000 0.556472 1.14177 0.937766 2.18497 3.50000 0.749097 1.69709 1.14329 3.95945 5.30000 1.13435 2.95109 1.50763 9.07927 8.00000 1.71222 5.10977 1.98383 20.6861 RHOSTAR: 0.0167446 NUSTAR: 38.4454 BETAP: 0.158390
Feb 1 1996 05:12:33:470PM	960201033	Jeff Schachter	Baseline shot for diamagnetic loops - need to get better measurement of absorbed power - NO PLASMA
Feb 1 1996 05:12:55:920PM	960201034	Jeff Schachter	Fiducial - as shot 960201001

Physics Operator Comments
Feb 1 1996 07:06:00:560AM		Steve Wolfe	Run 960201 MP# 122A SL: Schachter PO: wolfe Engineering setup: ------------------ No ECDC A-side 20psi D2 B-top 5psi D2 B-side lower 4psi Ar Fiducial setup as on 960131001 (do not enable Ar) After Fiducial start with setup from 951218031 Enable A-side,B-top,B-side lower. TF on Hybrid control. Experimental plan: ------------------ This run will be a continuation of the first rho-star scaling run, 18-DEC-1995. In the first run, we identified four different L-Mode regimes at 2.6 T that can be scaled up to 5.3 T. I label the regimes A-D. We will attempt to complete the scans for as many of the four regimes as possible. We will also try to do a rho-star scan for H-Mode (this was not in the original miniproposal).
Feb 1 1996 07:45:30:330AM		Steve Wolfe	Fiducial shot loaded from 960131001 last night. Coldstart ok at 1-FEB-1996 06:53:19.65 951218031 loaded into PCS (for after fiducial) last night. The first group of shots is described by Jeff as: * 5.3 T, group A 5 shots reload shot 951218031. try to hold NL04 at 1.1e20 (good period=0.72-0.80). Looking for: Ip = 620 kA NL04 = 1.1 e20 Te0(ECE) = 1.5 keV Prf = 0.8 MW or even a bit higher Run for Ti from Hirex Start by rerunning 951218031 as is. Unfortunately, the density on that shot ramped up over the time range of interest. If we can reproduce the shot on 960201, we should attempt to hold the density flat at 1.1e20. There was a brief flattop in 951218031 between 0.72s and 0.80s which may help in determining the proper settings for 960201. Once we can reliably obtain the proper density, rerun 3-4 times to get Hirex profiles. ********************************************************************** Looking at the shot in question, the density ramp he is complaining about seems to be from 1.09 to 1.16e20! The programming was for 1.25 and it was trying to reach it. John was playing a lot with PG3 feed-forward on that sequence, and I may need to do the same if he really cares about 10% changes. I also note that the current waveform is drawn as a ramp from 615kA to 635, to end up with Ip nearly flat around 620kA.
Feb 1 1996 08:08:50:450AM		Steve Wolfe	960201 0805h: They are having some difficulty cooling down, as a leak opens up when they turn on the cooling, even at 5pounds. There is an LN2 leak especially around B-port, which is the suspected site of the vacuum problem. The TF arms are essentially cold, but the core is still high by 20C and some PF coils ate warm.
Feb 1 1996 08:50:35:030AM	960201001	Steve Wolfe	Shot 960201001 - fiducial (from 960131001) : PLasma looked good. Irby noted that water came up on the RGA about 2sec before the shot. All gate valve systems appear to have good pressure, so its not clear where it came from. Fiducial shot loked ok.
Feb 1 1996 09:26:53:960AM	960201002	Steve Wolfe	Shot 960201002 Start of MP122A: Load 951218031 with no changes Disrupted at 0.5sec ? TF wasn't on hybrid control, so it went to 156kA (setting 160) instead of 145. Might have died from an injection. It looks resistive. ELM free ohmic H-mode starting at .43 sec! Radiation starts up so we must be accumulating impurities. It looks like EF1U is misbehaving , giving more voltage than requested during the same timne as the H-mode. JR reports he may have too much Argon for this current; presumably H-mode accumulation. Turn it off until we establish the shot.
Feb 1 1996 09:36:13:050AM	960201003	Steve Wolfe	Shot 960201003 Turn off Argon. TF really on Hybrid control this time. FS is looking at the EF1 problem as we run this one. Plasma full length (1.7sec). No H-mode. density rising a bit during flattop, also current rising 2Pi bolo says 50kW ohmic, 100kW RF (at 1MW) 35kJ. Grating TE0 seems to be set wrong, Michelson says 1.65keV
Feb 1 1996 09:50:53:480AM	960201004	Steve Wolfe	Shot 960201004 Reduce programmed Ip ramp Drop last NL04 point to 1.1 (what we want) Drop RF power a little. fizzle
Feb 1 1996 10:09:37:460AM	960201005	Steve Wolfe	Shot 960201005 Reduce pre-pulse from 18msec to 14msec Br may be a tad negative, but leave it alone for now. Plasma full length, PF crowbar at end. Ohmic H-mode again! It goes in after the Argon pulse. Maybe the increased ohmic power is enough to kick it into H-mode? Try turning it off with no other changes. EF1 blew fuses this time, some delay to check and fix.
Feb 1 1996 11:00:31:340AM	960201006	Steve Wolfe	Shot 960201006 Repeat except no Ar. Thomson laser may have also blown a fuse. Ed is checking before this shot. Snipes & Stek say 2 and 5 are not H-modes. They hve big MARFEs and may be shark-fin effects. Plasma-no fin or H or whatever. Jeff says it's golden.
Feb 1 1996 11:16:36:080AM	960201007	Steve Wolfe	Shot 960201007 Reducxe Argon to 2.16lbs and move argon pulse to .6sec. Otherwise repeat to start profile scan. Plasma- EF1U crowbars again at end, killing plasma. It seems the current is hitting the 6KA level at which it faults. Joe Daigle will fix this. I'll see about the rampdown.
Feb 1 1996 11:49:20:580AM	960201009	Steve Wolfe	Shot 960201009 Go to group D. Raise current to 800kA Extend ZCUR3 gain to 2 sec (was turning off at 1.6) Plasma - H-mode. Need to lower RF power.
Feb 1 1996 12:09:10:770PM	960201009	Steve Wolfe	Shot 960201010 MOve RCUR in 2mm (gap was smaller) Put bigger jog at 1.5 where I changed the offset H-mode again.
Feb 1 1996 12:09:22:720PM	960201010	Steve Wolfe	Shot 960201010 MOve RCUR in 2mm (gap was smaller) Put bigger jog at 1.5 where I changed the offset H-mode again.
Feb 1 1996 12:25:06:030PM	960201011	Steve Wolfe	Shot 960201011 Try again at even lower power. Still an H-mode. The YAG analysis program bombs because the shots are too long and the logic is screwy.
Feb 1 1996 12:32:30:590PM	960201012	Steve Wolfe	Shot 960201012 Load 951218022. Reduce pre-puff back to 14msec. This should be 2.6T, 300kA Plasma- disrupts just into rampdown at around 1.6 sec. Any longer and the YAG program will barf. Jeff says density is 10% too high.
Feb 1 1996 12:34:48:690PM	960201012	Steve Wolfe	Shot 960201012 Load 951218022. Reduce pre-puff back to 14msec. This should be 2.6T, 300kA Plasma- disrupts just into rampdown at around 1.6 sec. Any longer and the YAG program will barf. Jeff says density is 10% too high. The gas valve is off after .2sec
Feb 1 1996 12:51:09:390PM	960201013	Steve Wolfe	Shot 960201013 Reduce early density demand. The flattop request is at .3 already. Raise plenum pressure on Argon back to 4 lbs Disruption. .45 sec. OH2L crowbarred before disruption.
Feb 1 1996 01:01:51:640PM	960201014	Steve Wolfe	Shot 960201014 Argon pressure to 3 pounds (JR says signal was up by a factor of 6 last time). PLasma - ok, move along to group D
Feb 1 1996 01:24:43:030PM	960201016	Steve Wolfe	Shot 960201016 Reduce early density and force current to zero at 1.7sec fizzle. Null looks ok, maybe a little negative Br.
Feb 1 1996 01:41:04:640PM	960201017	Steve Wolfe	Shot 960201017 Drop pre-pulse to 12msec and increase Br from .0064 to .007 JR goes to cell to swap a CAMAC module. Disrupted at .5sec.
Feb 1 1996 01:49:08:720PM	960201018	Steve Wolfe	Shot 960201018 Put back some early density demand. I don't know why 17 disrupted. It also had a pretty ratty breakdown. fizzle.
Feb 1 1996 01:58:08:310PM	960201019	Steve Wolfe	Shot 960201019 Drop pre-pulse to 11msec. Br looked still a bit negative. Plasma- full length. Density is 10% too high! Te is 20% too low. A hint of hards early.
Feb 1 1996 02:21:05:670PM	960201021	Steve Wolfe	Shot 960201021 INcrease NL04 program to 4e19 Plasma- Got 5.7e19! Magnetics data corrupted (TRAQ2). EFIT bombed.
Feb 1 1996 02:25:32:560PM	960201022	Steve Wolfe	Shot 960201022 Repeat. Jeff says this will qualify for Group C. Dud. EF2L seems to have a problem.
Feb 1 1996 02:40:43:000PM	960201023	Steve Wolfe	Shot 960201023 Try again. Disrupts at 0.92. Possible injection. The density was back down to .4 again., Jeff says Te is still too low.
Feb 1 1996 02:46:58:660PM	960201024	Steve Wolfe	Shot 960201024 Try again. Plasma- back at .56e20.
Feb 1 1996 02:59:03:600PM	960201025	Steve Wolfe	Shot 960201025 Enough of this. Try raising density to 7.3e19 (ask for 8). This is an unscripted attempt to get a 2.6T H-mode point. Plasma- 8e19, and its cooooold
Feb 1 1996 03:08:58:050PM	960201026	Steve Wolfe	Shot 960201026 Lower request to 7e19. Yuichi will fire RF at 1.1sec Plasma- 8e19. RF didn't go.
Feb 1 1996 03:28:28:120PM	960201027	Steve Wolfe	Shot 960201027 Lower request to 6e19. Yuichi will fire RF at 1.1sec Start mixing in the plenum. Go to 12 psi D2, 8psi H2. Plasma-Still getting 8e19. No H-mode, a little RF
Feb 1 1996 03:52:31:340PM	960201028	Steve Wolfe	Shot 960201028 Turn off PG3 voltage after .5sec. Leave request at 6e19. Backed out of the shot. Gas fill fault on A-side piezo (red indicator) This was symptom before last week's TORVAC disaster. Bosco being called by Irby. Bosco thinks its not the same problem. Proceed after clearing. fizzle.
Feb 1 1996 04:11:07:170PM	960201029	Steve Wolfe	Shot 960201029 Go to 16msec prepulse. Change EF4 from -1150 to -1130A Plasma- RF causes a density increase, but Halpha goes up. No H-mode. Density is now at 6e19.
Feb 1 1996 04:30:50:030PM	960201030	Steve Wolfe	Shot 960201030 Load 960118033. We are now back to .0066 on Br, -1150 on EF4, 11msec on the puff. Also, these shots are shorter, Ip ramps down from 1.2sec Plasma- H-modes, PF crowbar. Disrupts at 1.25s Berakdown looks bad, try boosting the pre-pulse.
Feb 1 1996 04:36:04:510PM	960201031	Steve Wolfe	Shot 960201031 Pre-pulse back to 14msec. PLasma, H-modes, still disrupts, probably hitting q=3
Feb 1 1996 04:47:11:220PM	960201032	Steve Wolfe	Shot 960201032 Extend shape programming into rampdown to try to keep it from shrinking faster than the current rampdown. Also spped up the rampdown. PLasma-disrupted a litle earlier, before any of my changes.
Feb 1 1996 04:52:44:440PM	960201033	Steve Wolfe	Shot 960201033 Baseline shot for Granetz diamagnetic. Turn off gas and take TF off fizzle detector.
Feb 1 1996 05:10:24:160PM	960201034	Steve Wolfe	Shot 960201034 Fiducial:reload shot 1 Fiducial ok.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:43:33:560AM	Plasma	Ok	fiducial
2	09:01:53:340AM	Plasma	Ok
3	09:27:20:600AM	Plasma	Ok
4	09:44:27:160AM	Plasma	Ok
5	09:57:59:480AM	Plasma	Ok
6	10:50:31:900AM	Plasma	Ok
7	11:04:26:670AM	Plasma	Ok
8	11:23:08:410AM	Plasma	Ok
9	11:35:07:650AM	Plasma	Ok
10	11:51:12:110AM	Plasma	Ok
11	12:10:59:730PM	Plasma	Ok
12	12:28:27:790PM	Plasma	Ok
13	12:43:14:770PM	Plasma	Bad	oh2l comm fault
14	12:58:06:120PM	Plasma	Ok
15	01:08:17:350PM	Plasma	Ok
16	01:17:37:410PM	Plasma	Ok
17	01:29:41:370PM	Plasma	Ok
18	01:41:35:870PM	Plasma	Ok
19	01:50:26:240PM	Plasma	Ok
20	02:01:33:210PM	Plasma	Ok
21	02:11:53:080PM	Plasma	Ok
22	02:22:28:750PM	Plasma	Ok
23	02:31:46:480PM	Plasma	Ok
24	02:43:10:780PM	Plasma	Ok
25	02:52:36:670PM	Plasma	Ok
26	03:03:27:590PM	Plasma	Ok
27	03:22:22:510PM	Plasma	Ok
28	03:32:58:080PM	Plasma	Ok
29	04:00:41:270PM	Plasma	Ok
30	04:20:50:790PM	Plasma	Ok	Self powered c-bar OH2U.
31	04:32:44:290PM	Plasma	Ok
32	04:41:54:880PM	Plasma	Ok	Self powered fired C-Bar OH2u&l.
33	04:50:39:520PM	Plasma	Ok
34	05:00:14:070PM	Plasma	Ok