Alcator C-Mod Run 950308 Information

Miniproposals

Miniproposal:

Date Filed:

Title:

First Author:

Session Leader: Brian Labombard (shots 1-42)

Operators
Session leader(s):	Brian Labombard
Physics operator(s):	Robert Granetz
Engineering operator(s):	Vinny Bertolino,Joe Daigle

Engineering Operator Run Comment
granetz/labombard

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:12:507PM

Author: To Be Determined

Session Leader's summary of run 950308

MP# 084 Scrape_off Layer Characterization II

Physics Operator: Granetz
Session Leader: LaBombard
Engineering Operator: Bertolino/Daigle

The goal of this run was to study the scaling of scrape-off layer conditions
in single null diverted plasmas with plasma currents of 0.4, 0.6, 0.8, and 1.0 MA.

*** The run plan was:

5.3 Tesla deuterium plasmas, no impurity gas injection, no special wall preconditioning

(0) - start programming with 950228006 which is an 0.8 MA shot with very good constant
strike point programming (probe 2 on outer divertor), very good scanning probe targeting,
and good gaps.
Five key equilibrium shape parameters need to be watched during this run:
inner gap > 1.5 cm, outer gap > 1.5 cm, distance to second separatrix (SSEP on EFIT scope)
> 1.7 cm, constant outer divertor strike point location, and constant scanning probe target
flux surface location.

(1) - tune up a density ramp from NL_04 = 0.5e20 at 0.5 sec to 1.0e20 at 1 sec. Fire the
scanning probe at 0.5, 0.75 and 1.0 sec. (3 shots)

(2) - density ramp from NL_04 = 0.8e20 at 0.5 sec to 1.5e20 at 1 sec, fire probe (3 shots)

(2a) - optional at 1.0 MA: density ramp from NL_04 = 1.0e20 at 0.5 sec to 2.0e20 at 1 sec,
fire probe (3 shots)

- repeat steps (1) and (2) for plasma currents of 0.6, 0.4, and 1.0 MA.

(3) - for last 2 shots, return to 0.8 MA with density ramp NL_04 = 0.5e20 at 0.5 sec to
1.0e20 at 1 sec, fire probe

*** The actual run was:

We were successful in setting up the 0.8 MA and 1.0 MA plasmas with the three (or more)
density ramps as stated in steps (2), (2a) and (3) above. A bit more time was taken than
originally planned at the 1.0 MA level. This was partly due to the disruption-fizzle mode of operation
that we had to live with and partly due to the need to optimize the data from the fast-scanning probe.
It appears that the probe could not be inserted to the LCFS without over-currenting the bias
power supplies (2 amps per probe at -200 volts). We had to settle for 2-3 mm outside the
LCFS as the deepest penetration.
The 1.0 MA plasmas came at a cost: we managed to get 3 disruption 'strikes' exceeding 200kA
of halo current. Fortunately, the three strikes and you're out rule does not apply to tokamak
disruptions, even though they are a violent offense.
By 3:00 P.M. we were ready to attack the low current (0.4, 0.6 MA) part of the
miniproposal. Due to limited time, we decided to focus on 0.4 MA in order to get the widest
range in current. These plasmas were not to be. They typically disrupted early. Apparently they
were vertically unstable despite attempts by Bob (with some help from the wire-heads at large)
to adjust feedback gain on ZCUR. In the end we gave up on 0.4 MA thinking that 0.6 MA would be
easier (more stable). Still, the 0.6 MA plasmas behaved the same way. This is puzzling since
we were successful on 02-FEB-1995 to get some nice 0.5 MA plasmas. Bob's statement was
something like "looks like we need some more discharge development in order to do these plasmas".
I agree. The remainder of this miniproposal could be tougher to complete than the first part.

I would declare the first part of the miniproposal (diverted part) half done. Although
the point of it really was to perform a complete current scan ON THE SAME RUN DAY in order to
eliminate any systematic variations between runs (probe area changes, EFIT reconstruction
changes, other). However, given that this run is the backup for when the RF is not ready,
we may still have a chance to do a the full current scan in a single day.

See the phys_op_summary for a complete shot-by-shot commentary. Also entries were made
in the logbook under the physics operator and session leader topics.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:53:473PM

Author: To Be Determined

Physics operator's summary for run 950308.

SL: B. Labombard
PO: R. Granetz
EO: V. Bertolino

Today's run is devoted to MP #084, Scrape-off Layer Characterization II)
This was first attempted a week ago (950228), but was prematurely cancelled
due to disk quota problems. The run basically requires a well-diverted
plasma, into which Brian fires the scanning probe assembly three times
during the shot. Parameters to be scanned are density (ramped during the
shot) and plasma current. The goal is to get data at 0.4, 0.6, 0.8, and
1.0 MA.

Machine operation today was typical. At 0.8 and 1.0 MA we managed to get
plenty of good probe data. We eventually had numerous shots at these
currents that were disruption free, although it was a struggle. Nearly all
of the disruptions were due to loss of vertical control, and the reasons
for this are not obvious...kappa was not excessive. Most of the
1.0 MA disruptions were followed by a fizzle.

However, operation at 0.4 and 0.6 MA was not satisfactory. First of all,
the finely tuned plasma shape (x-point locations, strike points, etc) that
we had setup at the higher currents did not carry over to the lower currents.
I conclude that our so-called `orthogonal' controllers (and probably also
our estimators) are not very othogonal to plasma current. Secondly, the
plasma was even less vertically stable, and we didn't manage to get any
shot that made it to the end of flattop at these lower currents, although
lots of tweaks to slow and fast ZCUR PD gains were made. Very little useful
probe data was obtained at the low currents.

Detailed shot log follows:

Shot 001 - Plasma, disrupted at 1.135 s during rampdown, due to VDE. Lots
of moly injections. A few bits of hard x-rays. Gaps look
good, SSEP is marginal (1.5 cm). Multiple PF faults after the
shot ended.
Next shot: correct RCUR by entering offset of 8000 and adding 1 cm
to demand waveform. Also increase early gas puff.

Shot 002 - Dud. EF2U upper didn't switch on, due to operator error (mine!).
Next shot: import segment 01 from yesterday's run, and reset all
switch times to yesterday's as well. Increase ZXU by 0.5 cm in
order to increase SSEP from 1.5 to 2.0

Shot 003 - Runaway shot.
Next shot: adjust pre-fill from 2.0 to 2.4e-5 torr.

Shot 004 - Plasma, disrupted at 1.12 s during rampdown, due to a VDE. No
hard x-rays. Density had a lot of wobbles on it.
Next shot: lower proportional gain on density feedback. Also
lower the proportional gain on fast ZCUR after 1.0 s. Density
program was also changed slightly, in order to accomodate probe
firing times.

Shot 005 - Plasma, disrupted at 1.07 s, due to VDE. There were a few hard
x-rays. Density still had wobbles.
Next shot: lower derivative gain on fast ZCUR after 1 sec, and
also turn down proportional gain on density again. Also raise
pre-fill from 2.4 to 2.5e-5 torr.

Shot 006 - Plasma, disrupted at 1.06 s, VDE. Density wobbles are gone.
Next shot: tweak ZXL programming to try and keep the probe target
point fixed better (it's varying by 2 mm). Also reduce proportional
gain on slow ZCUR after 1 s.

Shot 007 - Plasma, disrupted at 1.06 s, VDE. Density did not reach the
requested maximum.
Next shot: tweak up the max demand density. Return all fast and
slow ZCUR gains (P's and D's) to the settings at the beginning
of today's run. Change CLEARIN to push the plasma against the
inner wall shortly after 1 s.

Shot 008 - Fizzle.
Next shot: reduce pre-fill from 2.5 to 2.4e-5 torr.

Shot 009 - Plasma, disrupted at 1.10 s. Density was okay, but there were some
hard x-rays.
Next shot: tweak ZXU to keep SSEP more constant. Increase range
of density ramp. Set it for nl_04=0.8e20 at 0.55 s, and
1.6e20 at 1.0 s. Also increase early gas puffing a little.

Shot 010 - Fizzle.
Next shot: on Earl's advice, lower OH1 voltage by 20 volts between
t=5 to 15 ms.

Shot 011 - Plasma, made it to 1.35 s before disrupting. Density makes it
only to 1.3e20 m-2.
Next shot: Change density pre-programmed voltage to better match
what we got.

Shot 012 - Plasma, made it to 1.35 s again before disrupting. Density ramp
was pretty good.
Next shot: move CLEARIN even further in after 1.3 s. Tweak ZXL
at bit to keep probe target point fixed better, and also increase
the density ramp: nl_04=1.0e20 at 0.55 s and 2.0e20 at 1.0 s

Shot 013 - Plasma, disrupted upward at 0.97 s. Density made it to 1.7e20 m-2.
This ends the probe dataset at 0.8 MA.
Next shot: raise plasma current to 1.0 MA and return density ramp
to lower values (copy nl_04 programming from shot 009)

Shot 014 - Plasma, bad VDE disruption at 0.58 s, with Ihalo_l=236 kA.
Kappa=1.66.
Next shot: lower proportional gain on fast ZCUR after 0.35 s.

Shot 015 - Fizzle.
Next shot: try again.

Shot 016 - Plasma, VDE disruption upwards at 0.56 s.
Next shot: half the slow ZCUR proportional gain, and return the
fast ZCUR gain to its earlier value.

Shot 017 - Dud. Caused by multiple power supply misbehavior.
Next shot: try again

Shot 018 - Fizzle. Way too much vertical field. No reason why.
Next shot: try again

Shot 019 - Plasma, disrupted downwards at 0.71 s with Ihalo_l=245 kA.
Next shot: tweak fast ZCUR gain down. Raised EF4 to account
for higher plasma current.

Shot 020 - Fizzle.
Next shot: load in higher density ramp, and the corresponding
pre-programmed voltage.

Shot 021 - Plasma. Nice shot (finally!).
Next shot: repeat.

Shot 022 - Plasma, but it terminates at 0.30 s due to a fault in EF1L at 0.2 s.
Next shot: repeat.

Shot 023 - Plasma. No disruption. Some hard x-rays. Some of Brian's scanning
probes had problems.
Next shot: increase early gas puff and repeat

Shot 024 - Plasma, nice shot. Brian's going to change the scanning probe
position by a few mm again on next shot.
Next shot: repeat

Shot 025 - Plasma, disrupted at 0.62 s. VDE, but there's a huge injection
of something at 0.59 s.
Next shot: repeat

Shot 026 - Fizzle.
Next shot: repeat

Shot 027 - Plasma, nice shot. Scanning probe data looks good.
Next shot: higher density; set ramp to go from 1.0e20 at 0.55 s to
2.0e20 at 1.0 s

Shot 028 - Plasma, nice shot. Density made it to 1.8e20 m-2.
Next shot: increase plenum pressure by about 20% and repeat.

Shot 029 - Plasma, nice shot. Magnetics Traq_2 failed. Because of that, we
have to repeat this shot.
Next shot: repeat

Shot 030 - Plasma, nice shot. Really good repeat.
Next shot: lower density; set ramp to go from 0.5e20 at 0.55 s to
1.0e20 at 1.0 s.

Shot 031 - Plasma, disrupted at 1.05 s. Scanning probe was pulled back for
safety purposes.
Next shot: repeat (probably will be a fizzle though)

Shot 032 - Fizzle.
Next shot: try again, one last time at this 1 MA level.

Shot 033 - Plasma, disrupted at 0.64 s, with Ihalo_l=216 kA. Got scanning
probe data at the lowest density, which is what we were really after
Next shot: Change plasma current to only 0.4 MA. Adjust EF4
accordingly. Note that this will probably be a fizzle anyway.

Shot 034 - Fizzle.
Next shot: try again.

Shot 035 - Plasma, 0.4 MA, disrupts upward at 0.98 s. There's a very large
and very fast increase in density at 0.86 s, which is probably
a detachment. The lower x-point rides up very far onto the
inner divertor. So much for our othogonal controllers and
estimators.
Next shot: Move RXL out by 1.5 cm and ZXL down by 1.5 cm.

Shot 036 - Plasma, but disrupted at only 0.30 s. Kappa=1.59.
Next shot: move plasma down by 0.5 cm to reduce kappa.

Shot 037 - Plasma, disrupted upward at 0.85 s. Magnetics traq_2 failed again.
Disruption happened at the same time as the density burst on
shot 035.
Next shot: lower the density ramp; 0.4e20 at 0.55 s to 0.8e20 at
1.0 s

Shot 038 - Plasma, but disrupted early at 0.33 s.
Next shot: minor changes to lower x-point programming time.

Shot 039 - Plasma, but disrupted early at 0.30 s due to VDE.
Give up on 0.4 MA.
Next shot: raise Ip to 0.6 MA, adjust EF4 accordingly, and return
density ramp to 0.5-1.0e20 m-2.

Shot 040 - Plasma, 0.6 MA, disrupted early at 0.42 s. Weird stuff on 2pi bolo
and x-rays starting at 0.3 s. Plasma is momentarily upper x-point.
Next shot: lower slow ZCUR P and D gains from 1.5 to 1.0.

Shot 041 - Plasma, but disrupted early at 0.41 s. There was a big impurity
injection at 0.39 s.
Next shot: return slow ZCUR P and D gains to 1.5, and boost up
the fast ZCUR derivative gain from 6 to 9.

Shot 042 - Plasma, but disrupted early at 0.42 s. Can't seem to overcome
the vertical instability problems at low plasma currents.

End of run.

Session Leader Comments

Mar 8 1995 08:46:55:700AM 950308001 Brian Labombard Shot: 1
No FSP. 0.8 MA plasma. Gaps look good ~ 2 cm. SSEP is 1.5 cm.
Strike points looks good. Density ramp from 0.5e20 @ .5 sec
to 1.0e20 at 1 sec - some wiggles though.

Mar 8 1995 08:50:13:710AM 950308002 Brian Labombard Shot: 2
FSP firing at .5, .75 and 1.0 sec. Rest position 5 mm.
No EF2 upper.

Mar 8 1995 09:03:00:790AM 950308003 Brian Labombard Shot: 3
FSP firing at .6, .8 and 1.0 sec. Rest position 5 mm.
very ulgy. disruption at 0.38 sec.

Mar 8 1995 09:18:20:770AM 950308004 Brian Labombard Shot: 4
FSP firing at .6, .8 and 1.0 sec. Rest position 5 mm.
Plasma. Still wobble on density. Made it to 2 mm outside LCFS.

Mar 8 1995 09:33:33:130AM 950308005 Brian Labombard Shot: 5
FSP firing at .6, .78 and .96 sec. Rest position 7 mm.
samples densities: .45, .77, .92 e10
First scan is 3 mm out. Second and third scans make it to LCFS

Mar 8 1995 09:42:44:460AM 950308006 Brian Labombard Shot: 6
FSP firing at .6, .78 and .96 sec. Rest position 7 mm.
samples densities: .5, .69, .88 e20
First scan is 2 mm outside, last two are at LCFS.

Mar 8 1995 09:52:46:190AM 950308007 Brian Labombard Shot: 7
FSP firing at .6, .78 and .96 sec. Rest position 7 mm.
samples densities: .47, .63, .76e20
2 mm outside on all three scans.

Mar 8 1995 09:59:48:660AM 950308008 Brian Labombard Shot: 8
FSP firing at .6, .78 and .96 sec. Rest position 9 mm.
No plasma

Mar 8 1995 10:15:05:120AM 950308009 Brian Labombard Shot: 9
FSP firing at .6, .78 and .96 sec. Rest position 9 mm.
samples densities: .47, .7, .92e20
First two scans make it to LCFS, last scan is 1mm inside.
SSEP ramps down from 1.8 @ .6 sec to .12 @ 1. sec
Try to fix this on next shot.

Mar 8 1995 10:29:43:040AM 950308010 Brian Labombard Shot: 10
FSP firing at .6, .78 and .96 sec. Rest position 9 mm.
no plasma

Mar 8 1995 10:48:50:040AM 950308011 Brian Labombard Shot: 11
FSP firing at .6, .78 and .96 sec. Rest position 9 mm.
samples denmsities: .8, 1., 1.3 e20
all three scans make it to LCFS.
Moly injection at .48 sec.

Mar 8 1995 11:13:56:470AM 950308012 Brian Labombard Shot: 12
FSP firing at .6, .78 and .96 sec. Rest position 9 mm.
samples denmsities: .86, 11., 1.5 e20
first two scans make it to LCFS. third scan is 3 mm out.

Mar 8 1995 11:18:08:770AM 950308013 Brian Labombard Shot: 13
FSP firing at .6, .78 and .96 sec. Rest position 9 mm.
samples denmsities: 1.0, 1.35., 1.7 e20
All three scans make it to LCFS

Mar 8 1995 11:31:54:130AM 950308014 Brian Labombard Shot: 14
FSP firing at .6, .78 and .96 sec. Rest position 0 mm.
This is a 1 MA shot. Disrupted just before first scan.

Mar 8 1995 11:36:58:910AM 950308015 Brian Labombard Shot: 15
FSP firing at .6, .78 and .96 sec. Rest position -5 mm.
fizzle.

Mar 8 1995 11:48:00:170AM 950308016 Brian Labombard Shot: 16
FSP firing at .6, .78 and .96 sec. Rest position -5 mm.
1MA disruption before first scan.

Mar 8 1995 11:58:50:600AM 950308017 Brian Labombard Shot: 17
FSP firing at .6, .78 and .96 sec. Rest position -5 mm.
Dud.

Mar 8 1995 12:07:57:610PM 950308018 Brian Labombard Shot: 18
FSP firing at .6, .78 and .96 sec. Rest position -5 mm.
Fizzle.

Mar 8 1995 12:37:03:120PM 950308020 Brian Labombard Shot: 20
FSP firing at .6, .78 and .96 sec. Rest position -5 mm.
Guess what - fizzle!

Mar 8 1995 12:53:17:760PM 950308022 Brian Labombard Shot: 22
FSP firing at .6, .78 and .96 sec. Rest position +5 mm.
Disrupted at .3 sec.

Mar 8 1995 01:13:44:160PM 950308023 Brian Labombard Shot: 23
FSP firing at .6, .78 and .96 sec. Rest position 6 mm.
Sampled densities: .9, 1.2, 1.4 e20
second scan is overinserted by 1 mm. Other two scans
are at LCFS.

Mar 8 1995 01:38:20:610PM 950308025 Brian Labombard Shot: 25
FSP firing at .6, .78 and .96 sec. Rest position 3 mm.
diruption at .625 sec, just after first scan.

Mar 8 1995 01:41:51:260PM 950308026 Brian Labombard Shot: 26
FSP firing at .6, .78 and .96 sec. Rest position 3 mm.
Fizzle.

Mar 8 1995 02:03:59:970PM 950308027 Brian Labombard Shot: 27
FSP firing at .6, .78 and .96 sec. Rest position 3 mm.
samples densities: .88, 1.17, 1.4 e20
data looks the best so far. 3mm, 1mm, and 3mm outside LCFS

Mar 8 1995 02:18:49:890PM 950308028 Brian Labombard Shot: 28
FSP firing at .6, .78 and .96 sec. Rest position 3 mm.
samples densities: 1.28, 1.4, 1.7 e20
FSP data looks good. 2 mm outside LCFS.

Mar 8 1995 02:30:56:030PM 950308029 Brian Labombard Shot: 29
FSP firing at .6, .78 and .96 sec. Rest position 3 mm.
samples densities: 1.2, 1.53, 2.0 e20
FSP data looks good. FSP position=???.
Traq digitizers crapped out on this shot. For EFIT to run, it will
have to use a different coil set. Since this could change the
estimate of the LCFS target for the scanning probe, we would rather
repeat the shot and use the same coil set.

Mar 8 1995 02:42:34:300PM 950308030 Brian Labombard Shot: 30
FSP firing at .6, .78 and .96 sec. Rest position 4.5 mm.
samples densities: 1.2, 1.5, 2.0 e20
FSP data looks good. 3 mm, 1mm, 3mm outisde.

Mar 8 1995 02:56:59:740PM 950308031 Brian Labombard Shot: 31
FSP firing at .6, .78 and .96 sec. Rest position -5 mm.
Setting up target

Mar 8 1995 03:01:23:240PM 950308032 Brian Labombard Shot: 32
FSP firing at .6, .78 and .96 sec. Rest position 3 mm.
Fizzle as expected.

Mar 8 1995 03:16:07:330PM 950308033 Brian Labombard Shot: 33
FSP firing at .6, .78 and .96 sec. Rest position 3 mm.
Disruption after first scan. First density scan at .5e20
Now changing to 0.4 MA.

Mar 8 1995 03:28:30:990PM 950308034 Brian Labombard Shot: 34
FSP firing at .6, .78 and .96 sec. Rest position 0 mm.
This is the required fizzle after a disruption.

Mar 8 1995 03:43:43:590PM 950308035 Brian Labombard Shot: 35
FSP firing at .6, .78 and .96 sec. Rest position 0 mm.
Divertor detaches gradually as density rises.
Full plasma detachment at 0.845 sec.
Target is above 25 mm.

Mar 8 1995 04:10:27:260PM 950308037 Brian Labombard Shot: 37
FSP firing at .6, .78 and .96 sec. Rest position 0 mm.
Plasma makes it to .86 sec. This should set the target for
the next shot.

Mar 8 1995 04:12:15:360PM 950308038 Brian Labombard Shot: 38
FSP firing at .6, .78 and .96 sec. Rest position 8 mm.
Disrupts just after .3 sec.

.

Mar 8 1995 04:47:10:930PM 950308040 Brian Labombard Shot: 40
FSP firing at .6, .78 and .96 sec. Rest position 8 mm.
Disrupts again just after .3 sec.
Changing to 0.6 MA on next shot.
Disrupts at .43 sec

Mar 8 1995 04:55:32:230PM 950308041 Brian Labombard Shot: 41
FSP firing at .6, .78 and .96 sec. Rest position 0 mm.
Disrupts again just after .3 sec.
Changing to 0.6 MA on next shot.
Disrupts at .415 sec

Mar 8 1995 05:01:24:000PM 950308042 Brian Labombard Shot: 42
FSP firing at .6, .78 and .96 sec. Rest position 0 mm.
Disrupts again just after .423

Physics Operator Comments

Mar 8 1995 08:28:42:520AM Robert Granetz SL: B. Labombard
PO: R. Granetz
EO: V. Bertolino

Today's run is devoted to MP #084, Scrape-off Layer Characterization II)
This was first attempted a week ago (950228), but was prematurely cancelled
due to disk quota problems. See the previous run summary and logbook
entries for general run plans and background info.

Mar 8 1995 08:46:59:810AM 950308001 Robert Granetz Shot 001 - Plasma, disrupted at 1.135 s during rampdown, due to VDE. Lots
of moly injections. A few bits of hard x-rays. Gaps look
good, SSEP is marginal (1.5 cm). Multiple PF faults after the
shot ended.
Next shot: correct RCUR by entering offset of 8000 and adding 1 cm
to demand waveform. Also increase early gas puff.

Mar 8 1995 08:56:42:130AM 950308002 Robert Granetz Shot 002 - Dud. EF2U upper didn't switch on, due to operator error (mine!).
Next shot: import segment 01 from yesterday's run, and reset all
switch times to yesterday's as well. Increase ZXU by 0.5 cm in
order to increase SSEP from 1.5 to 2.0

Mar 8 1995 09:03:34:320AM 950308003 Robert Granetz Shot 003 - Runaway shot.
Next shot: adjust pre-fill from 2.0 to 2.4e-5 torr

Mar 8 1995 09:16:17:820AM 950308004 Robert Granetz Shot 004 - Plasma, disrupted at 1.12 s during rampdown, due to a VDE. No
hard x-rays. Density had a lot of wobbles on it.
Next shot: lower proportional gain on density feedback. Also
lower the proportional gain on fast ZCUR after 1.0 s.

Mar 8 1995 09:47:10:920AM 950308005 Robert Granetz Shot 005 - Plasma, disrupted at 1.07 s, due to VDE. There were a few hard
x-rays. Density still had wobbles.
Next shot: lower derivative gain on fast ZCUR after 1 sec, and
also turn down proportional gain on density again. Also raise
pre-fill from 2.4 to 2.5e-5 torr.

Mar 8 1995 09:45:33:040AM 950308006 Robert Granetz Shot 006 - Plasma, disrupted at 1.06 s, VDE. Density wobbles are gone.
Next shot: tweak ZXL programming to try and keep the probe target
point fixed better (it's varying by 2 mm). Also reduce proportional
gain on slow ZCUR after 1 s.

Mar 8 1995 09:56:12:440AM 950308007 Robert Granetz Shot 007 - Plasma, disrupted at 1.06 s, VDE. Density did not reach the
requested maximum.
Next shot: tweak up the max demand density. Return all fast and
slow ZCUR gains (P's and D's) to the settings at the beginning
of today's run. Change CLEARIN to push the plasma against the
inner wall shortly after 1 s.

Mar 8 1995 10:01:12:260AM 950308008 Robert Granetz Shot 008 - Fizzle.
Next shot: reduce pre-fill from 2.5 to 2.4e-5 torr.

Mar 8 1995 10:15:57:740AM 950308009 Robert Granetz Shot 009 - Plasma, disrupted at 1.10 s. Density was okay, but there were some
hard x-rays.
Next shot: tweak ZXU to keep SSEP more constant. Increase range
of density ramp. Set it for nl_04=0.8e20 at 0.55 s, and
1.6e20 at 1.0 s. Also increase early gas puffing a little.

Mar 8 1995 10:33:21:710AM 950308010 Robert Granetz Shot 010 - Fizzle.
Next shot: on Earl's advice, lower OH1 voltage by 20 volts between
t=5 to 15 ms

Mar 8 1995 10:49:48:470AM 950308011 Robert Granetz Shot 011 - Plasma, made it to 1.35 s before disrupting. Density makes it
only to 1.3e20 m-2.
Next shot: Change density pre-programmed voltage to better match
what we got.

Mar 8 1995 11:01:09:620AM 950308012 Robert Granetz Shot 012 - Plasma, made it to 1.35 s again before disrupting. Density ramp
was pretty good.
Next shot: move CLEARIN even further in after 1.3 s. Tweak ZXL
at bit to keep probe target point fixed better, and also increase
the density ramp: nl_04=1.0e20 at 0.55 s and 2.0e20 at 1.0 s

Mar 8 1995 11:12:57:860AM 950308013 Robert Granetz Shot 013 - Plasma, disrupted upward at 0.97 s. Density made it to 1.7e20 m-2.
This ends the probe dataset at 0.8 MA.
Next shot: raise plasma current to 1.0 MA.

Mar 8 1995 11:31:50:110AM 950308014 Robert Granetz Shot 014 - Plasma, bad VDE disruption at 0.58 s, with Ihalo_l=236 kA.
Kappa=1.66.
Next shot: lower proportional gain on fast ZCUR after 0.35 s.

Mar 8 1995 11:39:52:250AM 950308015 Robert Granetz Shot 015 - Fizzle.
Next shot: try again.

Mar 8 1995 11:53:36:170AM 950308016 Robert Granetz Shot 016 - Plasma, VDE disruption upwards at 0.56 s.
Next shot: half the slow ZCUR proportional gain, and return the
fast ZCUR gain to its earlier value.

Mar 8 1995 11:59:25:820AM 950308017 Robert Granetz Shot 017 - Dud. Caused by multiple power supply misbehavior.
Next shot: try again

Mar 8 1995 12:18:25:170PM 950308018 Robert Granetz Shot 018 - Fizzle. Way too much vertical field. No reason why.
Next shot: try again

Mar 8 1995 12:26:57:320PM 950308019 Robert Granetz Shot 019 - Plasma, disrupted downwards at 0.71 s with Ihalo_l=245 kA.
Next shot: tweak fast ZCUR gain down. Raised EF4 to account
for higher plasma current.

Mar 8 1995 12:33:03:200PM 950308020 Robert Granetz Shot 020 - Fizzle.
Next shot: load in higher density ramp, and the corresponding
pre-programmed voltage.

Mar 8 1995 12:42:01:900PM 950308021 Robert Granetz Shot 021 - Plasma. Nice shot (finally!).
Next shot: repeat.

Mar 8 1995 12:54:25:350PM 950308022 Robert Granetz Shot 022 - Plasma, but it terminates at 0.30 s due to a fault in EF1L at 0.2 s.
Next shot: repeat.

Mar 8 1995 01:12:59:180PM 950308023 Robert Granetz Shot 023 - Plasma. No disruption. Some hard x-rays. Some of Brian's scanning
probes had problems.
Next shot: increase early gas puff and repeat

Mar 8 1995 01:25:51:120PM 950308024 Robert Granetz Shot 024 - Plasma, nice shot. Brian's going to change the scanning probe
position by a few mm again on next shot.
Next shot: repeat

Mar 8 1995 01:36:02:020PM 950308025 Robert Granetz Shot 025 - Plasma, disrupted at 0.62 s. VDE, but there's a huge injection
of something at 0.59 s.
Next shot: repeat

Mar 8 1995 01:43:53:540PM 950308026 Robert Granetz Shot 026 - Fizzle.
Next shot: repeat

Mar 8 1995 01:58:17:080PM 950308027 Robert Granetz Shot 027 - Plasma, nice shot. Scanning probe data looks good.
Next shot: higher density; set ramp to go from 1.0e20 at 0.55 s to
2.0e20 at 1.0 s

Mar 8 1995 02:16:38:760PM 950308028 Robert Granetz Shot 028 - Plasma, nice shot. Density made it to 1.8e20 m-2.
Next shot: increase plenum pressure by about 20% and repeat.

Mar 8 1995 02:28:34:120PM 950308029 Robert Granetz Shot 029 - Plasma, nice shot. Magnetics Traq_2 failed. Because of that, we
have to repeat this shot.
Next shot: repeat

Mar 8 1995 02:40:06:540PM 950308030 Robert Granetz Shot 030 - Plasma, nice shot. Really good repeat.
Next shot: lower density; set ramp to go from 0.5e20 at 0.55 s to
1.0e20 at 1.0 s.

Mar 8 1995 02:57:16:880PM 950308031 Robert Granetz Shot 031 - Plasma, disrupted at 1.05 s. Scanning probe was pulled back for
safety purposes.
Next shot: repeat (probably will be a fizzle though)

Mar 8 1995 03:00:50:100PM 950308032 Robert Granetz Shot 032 - Fizzle.
Next shot: try again, one last time at this 1 MA level.

Mar 8 1995 03:15:38:480PM 950308033 Robert Granetz Shot 033 - Plasma, disrupted at 0.64 s, with Ihalo_l=216 kA. Got scanning
probe data at the lowest density, which is what we were really after
Next shot: Change plasma current to only 0.4 MA. Adjust EF4
accordingly. Note that this will probably be a fizzle anyway.

Mar 8 1995 03:21:32:700PM 950308034 Robert Granetz Shot 034 - Fizzle.
Next shot: try again.

Mar 8 1995 03:43:16:840PM 950308035 Robert Granetz Shot 035 - Plasma, 0.4 MA, disrupts upward at 0.98 s. There's a very large
and very fast increase in density at 0.86 s, which is probably
a detachment. The lower x-point rides up very far onto the
inner divertor. So much for our othogonal controllers and
estimators.
Next shot: Move RXL out by 1.5 cm and ZXL down by 1.5 cm

Mar 8 1995 03:54:49:060PM 950308036 Robert Granetz Shot 036 - Plasma, but disrupted at only 0.30 s. Kappa=1.59.
Next shot: move plasma down by 0.5 cm to reduce kappa.

Mar 8 1995 04:09:19:620PM 950308037 Robert Granetz Shot 037 - Plasma, disrupted upward at 0.85 s. Magnetics traq_2 failed again.
Disruption happened at the same time as the density burst on
shot 035.
Next shot: lower the density ramp; 0.4e20 at 0.55 s to 0.8e20 at
1.0 s

Mar 8 1995 04:20:02:310PM 950308038 Robert Granetz Shot 038 - Plasma, but disrupted early at 0.33 s.
Next shot: minor changes to lower x-point programming time.

Mar 8 1995 04:29:43:800PM 950308039 Robert Granetz Shot 039 - Plasma, but disrupted early at 0.30 s due to VDE.
Give up on 0.4 MA.
Next shot: raise Ip to 0.6 MA, adjust EF4 accordingly, and return
density ramp to 0.5-1.0e20 m-2

Mar 8 1995 04:42:41:520PM 950308040 Robert Granetz Shot 040 - Plasma, 0.6 MA, disrupted early at 0.42 s. Weird stuff on 2pi bolo
and x-rays starting at 0.3 s. Plasma is momentarily upper x-point.
Next shot: lower slow ZCUR P and D gains from 1.5 to 1.0.

Mar 8 1995 05:00:59:750PM 950308041 Robert Granetz Shot 041 - Plasma, but disrupted early at 0.41 s. There was a big impurity
injection at 0.39 s.
Next shot: return slow ZCUR P and D gains to 1.5, and boost up
the fast ZCUR derivative gain from 6 to 9.

Mar 8 1995 05:01:15:100PM 950308042 Robert Granetz Shot 042 - Plasma, but disrupted early at 0.42 s. Can't seem to overcome
the vertical instability problems at low plasma currents.

End of run.

Engineering Operator Comments

Shot Time Type Status Comment

1 08:28:47:300AM Plasma Ok comm faults after fizzle

2 08:47:22:640AM Plasma Ok no faults

3 08:56:53:080AM Plasma Ok no faults

4 09:05:33:300AM Plasma Ok no faults

5 09:19:35:170AM Plasma Ok disruption, comm faults oh2u + oh1

6 09:33:37:460AM Plasma Ok disruption induced comm faults oh2u, ef1u, oh1

7 09:44:07:920AM Plasma Ok disruption induced comm faults oh2u, oh1

8 09:56:57:390AM Plasma Ok no faults

9 10:05:14:100AM Plasma Ok disruption induced comm faults

10 10:23:46:490AM Plasma Ok no faults

11 10:36:50:720AM Plasma Ok power supplies operating at optimum

12 10:49:52:700AM Plasma Ok disruption induced comm faults

13 11:04:52:760AM Plasma Ok disruption induced comm faults

14 11:21:59:630AM Plasma Ok no faults

15 11:33:58:990AM Plasma Ok no faults

16 11:42:52:010AM Plasma Ok disruption induced comm faults

17 11:54:51:400AM Plasma Bad oh2s no good

18 12:05:11:850PM Plasma Ok no faults

19 12:13:50:960PM Plasma Ok disruption induced comm faults

20 12:27:52:400PM Plasma Ok no faults

21 12:36:34:410PM Plasma Ok disruption induced comm faults

22 12:49:27:700PM Plasma Ok Comm fault oh2 u&l EF1 U&l

23 01:02:54:380PM Plasma Ok disruption induced comm faults

24 01:17:47:610PM Plasma Ok No Faults.

25 01:29:20:850PM Plasma Ok No Faults.

26 01:39:44:390PM Plasma Ok No Faults

27 01:51:31:350PM Plasma Ok Comm faults OH2L, EF1U&L, OH1

28 02:05:24:370PM Plasma Ok Comm fault oh2U&L, EF1U&L, OH1

29 02:18:30:160PM Plasma Ok No Faults.

30 02:32:06:490PM Plasma Ok Comm fault OH1U&L, EF1U&L, OH1

31 02:45:59:260PM Plasma Ok Comm fault OH2U, OH1, EF1U

32 02:59:06:850PM Plasma Ok No Faults

33 03:07:49:700PM Plasma Ok Comm fault OH2L & EF1L

34 03:19:29:010PM Plasma Ok No Faults

35 03:28:03:380PM Plasma Ok Comm Fault OH2L

36 03:44:05:100PM Plasma Ok Comm Fault EF1L

37 03:56:52:840PM Plasma Ok comm Fault OH2L

38 04:09:16:530PM Plasma Ok Comm Fault OH2L

39 04:22:19:110PM Plasma Ok Comm Fault OH2L EF1U

40 04:35:07:320PM Plasma Ok No Faults.

41 04:45:18:800PM Plasma Ok NO FAULTS>

42 04:57:11:750PM Plasma Ok No Faults.

Session Leader Comments
Mar 8 1995 08:46:55:700AM	950308001	Brian Labombard	Shot: 1 No FSP. 0.8 MA plasma. Gaps look good ~ 2 cm. SSEP is 1.5 cm. Strike points looks good. Density ramp from 0.5e20 @ .5 sec to 1.0e20 at 1 sec - some wiggles though.
Mar 8 1995 08:50:13:710AM	950308002	Brian Labombard	Shot: 2 FSP firing at .5, .75 and 1.0 sec. Rest position 5 mm. No EF2 upper.
Mar 8 1995 09:03:00:790AM	950308003	Brian Labombard	Shot: 3 FSP firing at .6, .8 and 1.0 sec. Rest position 5 mm. very ulgy. disruption at 0.38 sec.
Mar 8 1995 09:18:20:770AM	950308004	Brian Labombard	Shot: 4 FSP firing at .6, .8 and 1.0 sec. Rest position 5 mm. Plasma. Still wobble on density. Made it to 2 mm outside LCFS.
Mar 8 1995 09:33:33:130AM	950308005	Brian Labombard	Shot: 5 FSP firing at .6, .78 and .96 sec. Rest position 7 mm. samples densities: .45, .77, .92 e10 First scan is 3 mm out. Second and third scans make it to LCFS
Mar 8 1995 09:42:44:460AM	950308006	Brian Labombard	Shot: 6 FSP firing at .6, .78 and .96 sec. Rest position 7 mm. samples densities: .5, .69, .88 e20 First scan is 2 mm outside, last two are at LCFS.
Mar 8 1995 09:52:46:190AM	950308007	Brian Labombard	Shot: 7 FSP firing at .6, .78 and .96 sec. Rest position 7 mm. samples densities: .47, .63, .76e20 2 mm outside on all three scans.
Mar 8 1995 09:59:48:660AM	950308008	Brian Labombard	Shot: 8 FSP firing at .6, .78 and .96 sec. Rest position 9 mm. No plasma
Mar 8 1995 10:15:05:120AM	950308009	Brian Labombard	Shot: 9 FSP firing at .6, .78 and .96 sec. Rest position 9 mm. samples densities: .47, .7, .92e20 First two scans make it to LCFS, last scan is 1mm inside. SSEP ramps down from 1.8 @ .6 sec to .12 @ 1. sec Try to fix this on next shot.
Mar 8 1995 10:29:43:040AM	950308010	Brian Labombard	Shot: 10 FSP firing at .6, .78 and .96 sec. Rest position 9 mm. no plasma
Mar 8 1995 10:48:50:040AM	950308011	Brian Labombard	Shot: 11 FSP firing at .6, .78 and .96 sec. Rest position 9 mm. samples denmsities: .8, 1., 1.3 e20 all three scans make it to LCFS. Moly injection at .48 sec.
Mar 8 1995 11:13:56:470AM	950308012	Brian Labombard	Shot: 12 FSP firing at .6, .78 and .96 sec. Rest position 9 mm. samples denmsities: .86, 11., 1.5 e20 first two scans make it to LCFS. third scan is 3 mm out.
Mar 8 1995 11:18:08:770AM	950308013	Brian Labombard	Shot: 13 FSP firing at .6, .78 and .96 sec. Rest position 9 mm. samples denmsities: 1.0, 1.35., 1.7 e20 All three scans make it to LCFS
Mar 8 1995 11:31:54:130AM	950308014	Brian Labombard	Shot: 14 FSP firing at .6, .78 and .96 sec. Rest position 0 mm. This is a 1 MA shot. Disrupted just before first scan.
Mar 8 1995 11:36:58:910AM	950308015	Brian Labombard	Shot: 15 FSP firing at .6, .78 and .96 sec. Rest position -5 mm. fizzle.
Mar 8 1995 11:48:00:170AM	950308016	Brian Labombard	Shot: 16 FSP firing at .6, .78 and .96 sec. Rest position -5 mm. 1MA disruption before first scan.
Mar 8 1995 11:58:50:600AM	950308017	Brian Labombard	Shot: 17 FSP firing at .6, .78 and .96 sec. Rest position -5 mm. Dud.
Mar 8 1995 12:07:57:610PM	950308018	Brian Labombard	Shot: 18 FSP firing at .6, .78 and .96 sec. Rest position -5 mm. Fizzle.
Mar 8 1995 12:37:03:120PM	950308020	Brian Labombard	Shot: 20 FSP firing at .6, .78 and .96 sec. Rest position -5 mm. Guess what - fizzle!
Mar 8 1995 12:53:17:760PM	950308022	Brian Labombard	Shot: 22 FSP firing at .6, .78 and .96 sec. Rest position +5 mm. Disrupted at .3 sec.
Mar 8 1995 01:13:44:160PM	950308023	Brian Labombard	Shot: 23 FSP firing at .6, .78 and .96 sec. Rest position 6 mm. Sampled densities: .9, 1.2, 1.4 e20 second scan is overinserted by 1 mm. Other two scans are at LCFS.
Mar 8 1995 01:38:20:610PM	950308025	Brian Labombard	Shot: 25 FSP firing at .6, .78 and .96 sec. Rest position 3 mm. diruption at .625 sec, just after first scan.
Mar 8 1995 01:41:51:260PM	950308026	Brian Labombard	Shot: 26 FSP firing at .6, .78 and .96 sec. Rest position 3 mm. Fizzle.
Mar 8 1995 02:03:59:970PM	950308027	Brian Labombard	Shot: 27 FSP firing at .6, .78 and .96 sec. Rest position 3 mm. samples densities: .88, 1.17, 1.4 e20 data looks the best so far. 3mm, 1mm, and 3mm outside LCFS
Mar 8 1995 02:18:49:890PM	950308028	Brian Labombard	Shot: 28 FSP firing at .6, .78 and .96 sec. Rest position 3 mm. samples densities: 1.28, 1.4, 1.7 e20 FSP data looks good. 2 mm outside LCFS.
Mar 8 1995 02:30:56:030PM	950308029	Brian Labombard	Shot: 29 FSP firing at .6, .78 and .96 sec. Rest position 3 mm. samples densities: 1.2, 1.53, 2.0 e20 FSP data looks good. FSP position=???. Traq digitizers crapped out on this shot. For EFIT to run, it will have to use a different coil set. Since this could change the estimate of the LCFS target for the scanning probe, we would rather repeat the shot and use the same coil set.
Mar 8 1995 02:42:34:300PM	950308030	Brian Labombard	Shot: 30 FSP firing at .6, .78 and .96 sec. Rest position 4.5 mm. samples densities: 1.2, 1.5, 2.0 e20 FSP data looks good. 3 mm, 1mm, 3mm outisde.
Mar 8 1995 02:56:59:740PM	950308031	Brian Labombard	Shot: 31 FSP firing at .6, .78 and .96 sec. Rest position -5 mm. Setting up target
Mar 8 1995 03:01:23:240PM	950308032	Brian Labombard	Shot: 32 FSP firing at .6, .78 and .96 sec. Rest position 3 mm. Fizzle as expected.
Mar 8 1995 03:16:07:330PM	950308033	Brian Labombard	Shot: 33 FSP firing at .6, .78 and .96 sec. Rest position 3 mm. Disruption after first scan. First density scan at .5e20 Now changing to 0.4 MA.
Mar 8 1995 03:28:30:990PM	950308034	Brian Labombard	Shot: 34 FSP firing at .6, .78 and .96 sec. Rest position 0 mm. This is the required fizzle after a disruption.
Mar 8 1995 03:43:43:590PM	950308035	Brian Labombard	Shot: 35 FSP firing at .6, .78 and .96 sec. Rest position 0 mm. Divertor detaches gradually as density rises. Full plasma detachment at 0.845 sec. Target is above 25 mm.
Mar 8 1995 04:10:27:260PM	950308037	Brian Labombard	Shot: 37 FSP firing at .6, .78 and .96 sec. Rest position 0 mm. Plasma makes it to .86 sec. This should set the target for the next shot.
Mar 8 1995 04:12:15:360PM	950308038	Brian Labombard	Shot: 38 FSP firing at .6, .78 and .96 sec. Rest position 8 mm. Disrupts just after .3 sec. .
Mar 8 1995 04:47:10:930PM	950308040	Brian Labombard	Shot: 40 FSP firing at .6, .78 and .96 sec. Rest position 8 mm. Disrupts again just after .3 sec. Changing to 0.6 MA on next shot. Disrupts at .43 sec
Mar 8 1995 04:55:32:230PM	950308041	Brian Labombard	Shot: 41 FSP firing at .6, .78 and .96 sec. Rest position 0 mm. Disrupts again just after .3 sec. Changing to 0.6 MA on next shot. Disrupts at .415 sec
Mar 8 1995 05:01:24:000PM	950308042	Brian Labombard	Shot: 42 FSP firing at .6, .78 and .96 sec. Rest position 0 mm. Disrupts again just after .423

Physics Operator Comments
Mar 8 1995 08:28:42:520AM		Robert Granetz	SL: B. Labombard PO: R. Granetz EO: V. Bertolino Today's run is devoted to MP #084, Scrape-off Layer Characterization II) This was first attempted a week ago (950228), but was prematurely cancelled due to disk quota problems. See the previous run summary and logbook entries for general run plans and background info.
Mar 8 1995 08:46:59:810AM	950308001	Robert Granetz	Shot 001 - Plasma, disrupted at 1.135 s during rampdown, due to VDE. Lots of moly injections. A few bits of hard x-rays. Gaps look good, SSEP is marginal (1.5 cm). Multiple PF faults after the shot ended. Next shot: correct RCUR by entering offset of 8000 and adding 1 cm to demand waveform. Also increase early gas puff.
Mar 8 1995 08:56:42:130AM	950308002	Robert Granetz	Shot 002 - Dud. EF2U upper didn't switch on, due to operator error (mine!). Next shot: import segment 01 from yesterday's run, and reset all switch times to yesterday's as well. Increase ZXU by 0.5 cm in order to increase SSEP from 1.5 to 2.0
Mar 8 1995 09:03:34:320AM	950308003	Robert Granetz	Shot 003 - Runaway shot. Next shot: adjust pre-fill from 2.0 to 2.4e-5 torr
Mar 8 1995 09:16:17:820AM	950308004	Robert Granetz	Shot 004 - Plasma, disrupted at 1.12 s during rampdown, due to a VDE. No hard x-rays. Density had a lot of wobbles on it. Next shot: lower proportional gain on density feedback. Also lower the proportional gain on fast ZCUR after 1.0 s.
Mar 8 1995 09:47:10:920AM	950308005	Robert Granetz	Shot 005 - Plasma, disrupted at 1.07 s, due to VDE. There were a few hard x-rays. Density still had wobbles. Next shot: lower derivative gain on fast ZCUR after 1 sec, and also turn down proportional gain on density again. Also raise pre-fill from 2.4 to 2.5e-5 torr.
Mar 8 1995 09:45:33:040AM	950308006	Robert Granetz	Shot 006 - Plasma, disrupted at 1.06 s, VDE. Density wobbles are gone. Next shot: tweak ZXL programming to try and keep the probe target point fixed better (it's varying by 2 mm). Also reduce proportional gain on slow ZCUR after 1 s.
Mar 8 1995 09:56:12:440AM	950308007	Robert Granetz	Shot 007 - Plasma, disrupted at 1.06 s, VDE. Density did not reach the requested maximum. Next shot: tweak up the max demand density. Return all fast and slow ZCUR gains (P's and D's) to the settings at the beginning of today's run. Change CLEARIN to push the plasma against the inner wall shortly after 1 s.
Mar 8 1995 10:01:12:260AM	950308008	Robert Granetz	Shot 008 - Fizzle. Next shot: reduce pre-fill from 2.5 to 2.4e-5 torr.
Mar 8 1995 10:15:57:740AM	950308009	Robert Granetz	Shot 009 - Plasma, disrupted at 1.10 s. Density was okay, but there were some hard x-rays. Next shot: tweak ZXU to keep SSEP more constant. Increase range of density ramp. Set it for nl_04=0.8e20 at 0.55 s, and 1.6e20 at 1.0 s. Also increase early gas puffing a little.
Mar 8 1995 10:33:21:710AM	950308010	Robert Granetz	Shot 010 - Fizzle. Next shot: on Earl's advice, lower OH1 voltage by 20 volts between t=5 to 15 ms
Mar 8 1995 10:49:48:470AM	950308011	Robert Granetz	Shot 011 - Plasma, made it to 1.35 s before disrupting. Density makes it only to 1.3e20 m-2. Next shot: Change density pre-programmed voltage to better match what we got.
Mar 8 1995 11:01:09:620AM	950308012	Robert Granetz	Shot 012 - Plasma, made it to 1.35 s again before disrupting. Density ramp was pretty good. Next shot: move CLEARIN even further in after 1.3 s. Tweak ZXL at bit to keep probe target point fixed better, and also increase the density ramp: nl_04=1.0e20 at 0.55 s and 2.0e20 at 1.0 s
Mar 8 1995 11:12:57:860AM	950308013	Robert Granetz	Shot 013 - Plasma, disrupted upward at 0.97 s. Density made it to 1.7e20 m-2. This ends the probe dataset at 0.8 MA. Next shot: raise plasma current to 1.0 MA.
Mar 8 1995 11:31:50:110AM	950308014	Robert Granetz	Shot 014 - Plasma, bad VDE disruption at 0.58 s, with Ihalo_l=236 kA. Kappa=1.66. Next shot: lower proportional gain on fast ZCUR after 0.35 s.
Mar 8 1995 11:39:52:250AM	950308015	Robert Granetz	Shot 015 - Fizzle. Next shot: try again.
Mar 8 1995 11:53:36:170AM	950308016	Robert Granetz	Shot 016 - Plasma, VDE disruption upwards at 0.56 s. Next shot: half the slow ZCUR proportional gain, and return the fast ZCUR gain to its earlier value.
Mar 8 1995 11:59:25:820AM	950308017	Robert Granetz	Shot 017 - Dud. Caused by multiple power supply misbehavior. Next shot: try again
Mar 8 1995 12:18:25:170PM	950308018	Robert Granetz	Shot 018 - Fizzle. Way too much vertical field. No reason why. Next shot: try again
Mar 8 1995 12:26:57:320PM	950308019	Robert Granetz	Shot 019 - Plasma, disrupted downwards at 0.71 s with Ihalo_l=245 kA. Next shot: tweak fast ZCUR gain down. Raised EF4 to account for higher plasma current.
Mar 8 1995 12:33:03:200PM	950308020	Robert Granetz	Shot 020 - Fizzle. Next shot: load in higher density ramp, and the corresponding pre-programmed voltage.
Mar 8 1995 12:42:01:900PM	950308021	Robert Granetz	Shot 021 - Plasma. Nice shot (finally!). Next shot: repeat.
Mar 8 1995 12:54:25:350PM	950308022	Robert Granetz	Shot 022 - Plasma, but it terminates at 0.30 s due to a fault in EF1L at 0.2 s. Next shot: repeat.
Mar 8 1995 01:12:59:180PM	950308023	Robert Granetz	Shot 023 - Plasma. No disruption. Some hard x-rays. Some of Brian's scanning probes had problems. Next shot: increase early gas puff and repeat
Mar 8 1995 01:25:51:120PM	950308024	Robert Granetz	Shot 024 - Plasma, nice shot. Brian's going to change the scanning probe position by a few mm again on next shot. Next shot: repeat
Mar 8 1995 01:36:02:020PM	950308025	Robert Granetz	Shot 025 - Plasma, disrupted at 0.62 s. VDE, but there's a huge injection of something at 0.59 s. Next shot: repeat
Mar 8 1995 01:43:53:540PM	950308026	Robert Granetz	Shot 026 - Fizzle. Next shot: repeat
Mar 8 1995 01:58:17:080PM	950308027	Robert Granetz	Shot 027 - Plasma, nice shot. Scanning probe data looks good. Next shot: higher density; set ramp to go from 1.0e20 at 0.55 s to 2.0e20 at 1.0 s
Mar 8 1995 02:16:38:760PM	950308028	Robert Granetz	Shot 028 - Plasma, nice shot. Density made it to 1.8e20 m-2. Next shot: increase plenum pressure by about 20% and repeat.
Mar 8 1995 02:28:34:120PM	950308029	Robert Granetz	Shot 029 - Plasma, nice shot. Magnetics Traq_2 failed. Because of that, we have to repeat this shot. Next shot: repeat
Mar 8 1995 02:40:06:540PM	950308030	Robert Granetz	Shot 030 - Plasma, nice shot. Really good repeat. Next shot: lower density; set ramp to go from 0.5e20 at 0.55 s to 1.0e20 at 1.0 s.
Mar 8 1995 02:57:16:880PM	950308031	Robert Granetz	Shot 031 - Plasma, disrupted at 1.05 s. Scanning probe was pulled back for safety purposes. Next shot: repeat (probably will be a fizzle though)
Mar 8 1995 03:00:50:100PM	950308032	Robert Granetz	Shot 032 - Fizzle. Next shot: try again, one last time at this 1 MA level.
Mar 8 1995 03:15:38:480PM	950308033	Robert Granetz	Shot 033 - Plasma, disrupted at 0.64 s, with Ihalo_l=216 kA. Got scanning probe data at the lowest density, which is what we were really after Next shot: Change plasma current to only 0.4 MA. Adjust EF4 accordingly. Note that this will probably be a fizzle anyway.
Mar 8 1995 03:21:32:700PM	950308034	Robert Granetz	Shot 034 - Fizzle. Next shot: try again.
Mar 8 1995 03:43:16:840PM	950308035	Robert Granetz	Shot 035 - Plasma, 0.4 MA, disrupts upward at 0.98 s. There's a very large and very fast increase in density at 0.86 s, which is probably a detachment. The lower x-point rides up very far onto the inner divertor. So much for our othogonal controllers and estimators. Next shot: Move RXL out by 1.5 cm and ZXL down by 1.5 cm
Mar 8 1995 03:54:49:060PM	950308036	Robert Granetz	Shot 036 - Plasma, but disrupted at only 0.30 s. Kappa=1.59. Next shot: move plasma down by 0.5 cm to reduce kappa.
Mar 8 1995 04:09:19:620PM	950308037	Robert Granetz	Shot 037 - Plasma, disrupted upward at 0.85 s. Magnetics traq_2 failed again. Disruption happened at the same time as the density burst on shot 035. Next shot: lower the density ramp; 0.4e20 at 0.55 s to 0.8e20 at 1.0 s
Mar 8 1995 04:20:02:310PM	950308038	Robert Granetz	Shot 038 - Plasma, but disrupted early at 0.33 s. Next shot: minor changes to lower x-point programming time.
Mar 8 1995 04:29:43:800PM	950308039	Robert Granetz	Shot 039 - Plasma, but disrupted early at 0.30 s due to VDE. Give up on 0.4 MA. Next shot: raise Ip to 0.6 MA, adjust EF4 accordingly, and return density ramp to 0.5-1.0e20 m-2
Mar 8 1995 04:42:41:520PM	950308040	Robert Granetz	Shot 040 - Plasma, 0.6 MA, disrupted early at 0.42 s. Weird stuff on 2pi bolo and x-rays starting at 0.3 s. Plasma is momentarily upper x-point. Next shot: lower slow ZCUR P and D gains from 1.5 to 1.0.
Mar 8 1995 05:00:59:750PM	950308041	Robert Granetz	Shot 041 - Plasma, but disrupted early at 0.41 s. There was a big impurity injection at 0.39 s. Next shot: return slow ZCUR P and D gains to 1.5, and boost up the fast ZCUR derivative gain from 6 to 9.
Mar 8 1995 05:01:15:100PM	950308042	Robert Granetz	Shot 042 - Plasma, but disrupted early at 0.42 s. Can't seem to overcome the vertical instability problems at low plasma currents. End of run.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:28:47:300AM	Plasma	Ok	comm faults after fizzle
2	08:47:22:640AM	Plasma	Ok	no faults
3	08:56:53:080AM	Plasma	Ok	no faults
4	09:05:33:300AM	Plasma	Ok	no faults
5	09:19:35:170AM	Plasma	Ok	disruption, comm faults oh2u + oh1
6	09:33:37:460AM	Plasma	Ok	disruption induced comm faults oh2u, ef1u, oh1
7	09:44:07:920AM	Plasma	Ok	disruption induced comm faults oh2u, oh1
8	09:56:57:390AM	Plasma	Ok	no faults
9	10:05:14:100AM	Plasma	Ok	disruption induced comm faults
10	10:23:46:490AM	Plasma	Ok	no faults
11	10:36:50:720AM	Plasma	Ok	power supplies operating at optimum
12	10:49:52:700AM	Plasma	Ok	disruption induced comm faults
13	11:04:52:760AM	Plasma	Ok	disruption induced comm faults
14	11:21:59:630AM	Plasma	Ok	no faults
15	11:33:58:990AM	Plasma	Ok	no faults
16	11:42:52:010AM	Plasma	Ok	disruption induced comm faults
17	11:54:51:400AM	Plasma	Bad	oh2s no good
18	12:05:11:850PM	Plasma	Ok	no faults
19	12:13:50:960PM	Plasma	Ok	disruption induced comm faults
20	12:27:52:400PM	Plasma	Ok	no faults
21	12:36:34:410PM	Plasma	Ok	disruption induced comm faults
22	12:49:27:700PM	Plasma	Ok	Comm fault oh2 u&l EF1 U&l
23	01:02:54:380PM	Plasma	Ok	disruption induced comm faults
24	01:17:47:610PM	Plasma	Ok	No Faults.
25	01:29:20:850PM	Plasma	Ok	No Faults.
26	01:39:44:390PM	Plasma	Ok	No Faults
27	01:51:31:350PM	Plasma	Ok	Comm faults OH2L, EF1U&L, OH1
28	02:05:24:370PM	Plasma	Ok	Comm fault oh2U&L, EF1U&L, OH1
29	02:18:30:160PM	Plasma	Ok	No Faults.
30	02:32:06:490PM	Plasma	Ok	Comm fault OH1U&L, EF1U&L, OH1
31	02:45:59:260PM	Plasma	Ok	Comm fault OH2U, OH1, EF1U
32	02:59:06:850PM	Plasma	Ok	No Faults
33	03:07:49:700PM	Plasma	Ok	Comm fault OH2L & EF1L
34	03:19:29:010PM	Plasma	Ok	No Faults
35	03:28:03:380PM	Plasma	Ok	Comm Fault OH2L
36	03:44:05:100PM	Plasma	Ok	Comm Fault EF1L
37	03:56:52:840PM	Plasma	Ok	comm Fault OH2L
38	04:09:16:530PM	Plasma	Ok	Comm Fault OH2L
39	04:22:19:110PM	Plasma	Ok	Comm Fault OH2L EF1U
40	04:35:07:320PM	Plasma	Ok	No Faults.
41	04:45:18:800PM	Plasma	Ok	NO FAULTS>
42	04:57:11:750PM	Plasma	Ok	No Faults.