Alcator C-Mod Run 950602 Information

Miniproposals

Miniproposal: 078

Date Filed: 2/8/1995

Title: ICRF Heating in H-mode Plasmas

First Author: Yuichi Takase

Session Leader: Steve Golovato (shots 1-31)

Operators
Session leader(s):	Steve Golovato
Physics operator(s):	Joseph Snipes
Engineering operator(s):	Vinny Bertolino,Joe Daigle

Engineering Operator Run Comment
snipe

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:13:867PM

Author: To Be Determined

run summary - 950602
---------------------
SL: golovato
PO: snipes
EO: bertolino/daigle

The goal of the run was to continue the search for better h-modes at 5.3 T,
better meanig higher h-factor, or at least longer elm-free phases.
Specifiically we proposed the following approaches.

(1) start with shot 950523017, a higher triangularity configuration,
vary outer gap to keep rf from tripping during h-mode.
(2) go to higher triangularity, at the expense of elongation and
running limited if necessary.
(3) density scan, revisit lower densities where thresholds are lower,
see how much power we can get in.

We tried the above and some other things but got neither higher h-factors
nor longer elm-free phases. We did get FSP and laser blowoff data. It seems
clear from the laser blowoff that particle confinement is strongly enhanced
and this causes both a fast density rise and impurity accumulation. Some
combination of these effects may be our current limitation. Brian
LaBombard has noted that we only get rf h-modes when the midplane neutral
pressure falls below 0.4 mtorr. This may be true before rf, in which
case we quickly go into elm-free h-mode, or it may fall during rf, in which
case we get h-modes later in the rf pulse when it falls below the "magic"
value of 0.4 mtorr. The new, improved 2pi bolomater is a sensitive diagnostic
of elms and can be used to evaluate h-mode quality.

We started out with shot 950523017 but the configuration with these settings
had an inner wall x-point, which it didn't have on 950523. We did not get
h-modes through shot 006 so we went back to our "standard" elm-free h-mode
shot (950523009) and got back the h-modes on shots 007-009. We the went back
to shot 006 and began tweaking it to get h-modes. By lowering the initial
nl04 to 1.35e20 from 1.5e20 and cutting off the gas voltage programming, we
got h-modes on shot 013. Shots 013-020 were a density scan down to 0.7e20.
The h-modes deteriorated with decreasing density with no h-modes at the lowest
density, even with 2,2 MW of power. We then tried to control the midplane
pressure by better mapping the SOL flux into the divertor. We got a highly
triangular plasma (ltriang=0.7) on shot 023 with the desired flux mapping,
but no better h-modes. This was done mainly by moving the upper x-point more
up. We then tried moving it down on shots 027 and 031, making the h-modes
worse. On shots 028 and 029 we tried extreme edge gas control. We fired in
a Li pellet and turned off the gas completely. On shot 028 the pellet didn't
fire and we got h-modes which held up the density even though the gas was off.
On shot 029, the pellet fired but we got no h-modes and the density fell to
nl04=0.5e20 by the end of the shot, with 2.8 MW of power.

Some suggestions include:

(1) a 2.6 T run to look at h-mode thresholds and factors. We have seen
good 2nd harmonic heating here and might learn a lot about B-field vs size
scaling.

(2) Boronization to control the Moly influx.

(3) Better gas control (divertor pumping, pellet fueling) to control the
density rise.

We have a summer to think about it.

The session leader shot-to-shot summary can be found in the logbook under the
session_leader topic. Details on technical difficulties can be found in the
physics operator summary.

The shot summary was: 29 plasmas (3 early disruptions, 1 runaway)
2 fizzles

RUN: 950602 SHOT: 950602001 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 08:54:58.40
TEXT: shot 950602001 - loaded shot 950523017
plasma and rf worked. no h-modes. 2.3mw, 1.5e20
got x-point on upper inner wall, unlike shot 950523017.
got disruptions with configurations like this last time.

RUN: 950602 SHOT: 950602002 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 09:03:12.12
TEXT: shot 950602002 - disrupted early before rf
looks like moly injection, we'll have moly mon next shot.

RUN: 950602 SHOT: 950602003 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 09:19:31.35
TEXT: shot 950602003 - plasma, no h-modes, 2.1mw. still have
upper inner wall x-point. will try to get rid of it.

RUN: 950602 SHOT: 950602004 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 09:36:28.58
TEXT: shot 950602004 - plasma, 2.2mw. similar to shot 003.
inner wall x-point later in time, making progress.
camac problems for rf data on shots 003 and 004, timing incorrect.

RUN: 950602 SHOT: 950602005 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 09:49:41.69
TEXT: shot 950602005 - plasma, 2.2mw. no h-modes.
rf camac problems continue.

RUN: 950602 SHOT: 950602006 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 10:02:12.26
TEXT: shot 950602006- plasma, 2.2mw. same as previous shots.
rf data timing fixed.

RUN: 950602 SHOT: 950602007 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 10:26:00.36
TEXT: shot 950602007- reload shot 950523009, the standard configuration
which gave multiple h-modes. see if we still get them.
plasma, h-modes. daq1 problems this shot.

RUN: 950602 SHOT: 950602008 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 10:40:19.76
TEXT: shot 950602008 - repeat but moved upper x-point up a little, see
effect on h-modes.

plasma, multiple h-modes. 2.5mw, some rf trips.

RUN: 950602 SHOT: 950602008 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 10:50:23.90
TEXT: shot 950602008 - repeat but moved upper x-point up a little, see
effect on h-modes.

plasma, multiple h-modes. 2.5mw, some rf trips.

RUN: 950602 SHOT: 950602009 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 11:05:00.69
TEXT: shot 950602009 - repeat. plasma. continuous elmy h-mode.
2.65mw.

RUN: 950602 SHOT: 950602010 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 11:06:53.35
TEXT: shot 950602010 - back to shot 006, higher triangularity.
move plasma out at 750ms.

plasma, no rf. no h-modes.

RUN: 950602 SHOT: 950602011 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 11:33:18.28
TEXT: shot 950602011 - lower nl04 to 1.4 form 1.5e20. shots with h-mode
today and on 950523 had lower nl04.

brian has been telling us the last two h-mode runs that getting h-modes
is well correlated with midplane pressure. we get them when it is
below 0.4mtorr. this is consistent with today's data. we get higher
edge pressure when the upper x-point is closer in.

plasma, no h-mode.

RUN: 950602 SHOT: 950602012 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 11:39:37.96
TEXT: shot 950602012 - lower nl04 to 1.4 form 1.5e20. this was not done
for previous shot.

plasma. 2.55mw. got very brief h-mode at 930ms. we're moving in right
direction, still have nl too high.

RUN: 950602 SHOT: 950602013 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 12:00:39.93
TEXT: shot 950602013 - nl04 to 1.35, less pre-programmed gas.

plasma, h-modes, two elm-free periods. midplane gas below 0.4mtorr
nl04=1.4e20, 2.55mw.

RUN: 950602 SHOT: 950602014 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 12:18:54.48
TEXT: shot 950602014 - lower nl, gas off earlier.

plasma, 3 h-modes. rf trips end elm-free periods.

RUN: 950602 SHOT: 950602015 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 12:34:50.91
TEXT: shot 950602015 - tune rf to avoid trips.

plasma, 4 elm-free periods, no trips. 2.55mw.

RUN: 950602 SHOT: 950602016 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 12:48:32.96
TEXT: shot 950602016 - lower nl04 to 1.1e20.

plasma, initial elm-free density rise followed by jumps back
and forth from l to h, but no clear elmy phases. 2pi bolo
sees oscillation from low level elms to elm-free which correlate
with density downs and ups.

RUN: 950602 SHOT: 950602017 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 12:56:07.68
TEXT: shot 950602017 - lower nl04 to 0.9e20.

runaway shot.

RUN: 950602 SHOT: 950602018 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 13:10:44.25
TEXT: shot 950602018 - try again.

plasma. early disruption.

RUN: 950602 SHOT: 950602019 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 13:21:19.56
TEXT: shot 950602019 - plasma, dithering. 2.25mw, nl04=1.e20

RUN: 950602 SHOT: 950602020 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 13:36:46.04
TEXT: shot 950602020 - lower to nl04 to 0.7e20.

plasma, early disruption, moly injection.

RUN: 950602 SHOT: 950602021 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 13:58:30.35
TEXT: shot 950602021 - try again.

plasma, disrupted at 860ms. no h-mode at 2.2mw, nl04=0.7e20.

RUN: 950602 SHOT: 950602022 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 14:13:42.84
TEXT: shot 950602022 - reload shot 015, which had nl04=1.25e20. moving
plasma up and lower x-point in to get more sol flux to map into
divertor.

fizzle.

RUN: 950602 SHOT: 950602023 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 15:10:46.78
TEXT: shot 950602023 - plasma, some hards, h-modes. 2.25mw.

got more flux into divertor on outside. h-modes not as good.

RUN: 950602 SHOT: 950602024 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 15:28:01.13
TEXT: shot 950602024 - move upper x-point further out to get more sol
to map around to inner lower divertor, which is on top of nose
for this configuration. lower triang = 0.7 for last shot.

plasma. several h-modes but not longer.

RUN: 950602 SHOT: 950602025 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 15:47:02.57
TEXT: shot 950602025 - more configuration twiddling.

plasma, several h-modes. much like the last shot.

RUN: 950602 SHOT: 950602026 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 15:59:41.87
TEXT: shot 950602026 - raise density to nl04=1.4e20

plasma with several h-modes, simlar to other shots. 40ms elm-free

RUN: 950602 SHOT: 950602027 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 16:22:14.03
TEXT: shot 950602027 - move upper x-point down instead of up as we have been
moving it.

plasma, no h-modes. 2.6mw. midplane pressure much higher.

RUN: 950602 SHOT: 950602028 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 16:45:12.27
TEXT: shot 950602028 - reload shot 026, shoot Li pellet at 650ms and turn off
gas. fire rf at 750ms after pellet density decays but with no gas
fueling.

plasma. several h-modes. 2.65mw.

RUN: 950602 SHOT: 950602029 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 16:47:05.90
TEXT: shot 950602029 - last shot had no pellet. this one with pellet
had no h-modes and density fell to nl04=0.5e20. 2.8mw

RUN: 950602 SHOT: 950602030 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 16:49:05.77
TEXT: shot 950602030 - reload shot 026 and adjust zxu to be about half the
change made for shot 027, lowering it by 3.cm instead of 5cm.

fizzle.

RUN: 950602 SHOT: 950602031 TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 17:03:30.33
TEXT: shot 950602031 - try it again.

plasma, two wimpy h-modes. 2.7mw.

RUN: 950602 SHOT: NULL TOPIC: SESSION_LEADER USERNAME: GOLOVATO
ENTERED: 2-JUN-1995 08:39:43.83

Physics Operator Summaries

Entered: Jul 7 2004 04:36:54:660PM

Author: To Be Determined

MP078A ICRF H-mode Run
Engineer in charge: Vince Bertolino
Physics Operator: Joseph Snipes
Session Leader: Steve Golovato

This run will take over from where we left off on 950523 and we will set up
with shot 950523017. ECDC was performed in deuterium for 1 hour and 45
min. before the run, then shut off by 7:45 am or so to allow the machine
to pump out before the run. The plan is to first start with our previous
good shot, 950523017 with relatively high triangularity, high density (nl =
1.4 x 10^20 m^-2), 1 MA, 5.3 T, and try to keep the RF power up and
maintain ELM-free H-modes. We will then scan the density down to as low as
nl = 8 x 10^19 m^-2. After spending a number of shots trying to increase
the ELM-free H-mode durations, we will then change to a limited or nearly
inner wall limited plasma shifted above the midplane with low elongation
and high triangularity. For this, we will start with shot 950526031,
shifting the plasma up and trying to increase the triangularity to attempt
to reach triangularities above 0.7. This requires running above the nose of
the divertor. If we succeed in getting decent plasmas under these
conditions, we will again scan the density to try to optimize ICRF H-modes
with high triangularity.

It was a very good run. We succeeded in accomplishing much of what
was planned. However, the H-modes were not significantly better than in
previous runs. We did learn some things about getting H-modes. The most
important thing appears to be that the midplane neutral pressure does indeed
correlate with getting the H-mode and that the midplane pressure correlates
with how much flux maps from the inboard to the outboard plate. By
comparing shots 26, 27 and 31, one sees that the more flux that maps around
from the inboard to the outboard plate, the lower the neutral pressure at
the midplane and the better the H-mode. This difference in the recycling
outweighed differences in the triangularity. Still, the ELM-free H-modes
only lasted at most 40 - 50 msec. The direction to head seems to be to
increase the inner gap, increase the amount of flux that maps around the
plasma from the inner to the outer plate, and then try to also increase the
triangularity beyond 0.7.

From the technical side, the machine ran quite well, though there
were a couple of problems. About shot 22, Earl noticed that the TF was at
5.1 T rather than 5.3 T. In fact, it had been low since shot 15. We spent
some time looking into it, but then decided to ask for more TF current to
get the field that we wanted. That worked fine until shot 31, when we
actually got 5.5 T. This problem should be looked into some more. There
was also a disruption caused by an EF1U fault on shot 29 that was resolved
immediately. There were 31 shots, 30 plasmas, and 1 Fizzle. There were no
warnings or strikes.

Shot 1 : Copied shot 950523017. Good shot. No H-mode with 2.3 MW
of RF
2 : Removed step in RCUR from 0.75 to 1.05 sec. Disrupted at
0.74 sec. Probably a moly injection at 0.69 sec.
3 : Try again. Good shot. No H-mode. RF at 2 MW (timing error).
4 : Moved ZXU up from 0.5 sec to 4.5 cm then up to 4.75 cm from
0.6 to 1 sec. Extended gas pre-programming on both A side
and B top valves to 1 sec. No H-mode with 2.3 MW of RF.
RF timing error.
5 : Moved ZXU up to 5 cm from 0.6 to 1 sec. Good shot. No
H-mode. RF up to 2.3 MW.
6 : Moved RXU out by 0.5 cm and ZXU up by 0.5 cm. Good shot. No
H-mode. RF up to 2.3 MW. Good configuration with high
triangularity.
7 : Reloaded shot 950523009. Good shot. ELM-free 0.8 - 0.85
sec then ELMy 0.9 to 1.01 sec.
8 : Moved ZXU up to 5.5 cm from 0.5 to 1 sec. Zirconium
injection at 0.94 sec. Good shot. ELM-free and ELMy
H-modes from 0.79 - 1.02 sec. Zirconium at 0.94 sec.
9 : Repeat. Good shot. ELMy H-mode from 0.79 - 0.95 sec.
10: Returned to shot 6 with a step in RCUR from 0.75 to 1.05
sec. No RF. No H-mode.
11: Repeat. Good shot. No H-mode.
12: Lowered nel to 1.4 x 10^20 m^-2. Good shot. Short H-mode
0.94 - 0.95 sec.
13: Reduced nel to 1.35 x 10^20 m^-2. Turned off
pre-programmed gas feed at 0.8 sec. Good shot. H-modes
0.88 - 0.92 and 0.99 - 1.01 sec.
14: Reduced nel to 1.25 x 10^20 m^-2. Turned off
pre-programmed gas feed at 0.75 sec. Good shot. 3 ELM-free
H-modes 0.85 - 1.01 sec.
15: Repeat to tune RF. Good shot. 4 ELM-free H-modes 0.85 -
1.01 sec.
16: Lowered nel to 1.1 x 10^20 m^-2. Good shot. In and out of
H-mode from 0.85 - 1.03 sec.
17: Lowered nel to 0.9 x 10^20 m^-2. Bad shot. Hard x rays
from the current rise. Disrupted at 0.38 sec.
18: Try again. Increased prefill to 1.9 x 10^-5 Torr. Bad
shot. Disrupted at 0.48 sec.
19: Reduced early gas a bit. OK shot. 2.2 MW of RF with
dithering. Very high radiated power.
20: Reduced nel to 7 x 10^19 m^-2. Bad shot. Disrupted at 0.6
sec.
21: Try again. Bad shot. Disrupted at 0.86 sec during RF.
22: Returning to shot 15 with B top enabled. RXL moved in 2 cm,
ZXL moved up 3 cm, and ZCUR moved up to +0.5 cm. ZXU moved
up by 2 cm to 7.5 cm. There is a problem with the TF in
that the field only reaches 5.1 T. The problem has been
there since shot 15. Short delay to investigate.
23: Prefill set to 1.7 x 10^-5 Torr. Good shot. 2 ELM-free
H-modes from 0.85 - 0.92 sec.
24: Prefill set to 1.8 x 10^-5 Torr. Changed ZXU controller
reference to 0.44 m and shifted the waveform to start at
-5 cm and ramp to + 5 cm. Good shot. Several H-modes from
0.81 - 0.99 sec.
25: Increased ZXU to 7.5 cm. Moved ramp in RXL to 0.45 sec.
Good shot. H-modes from 0.81 to 1.01 sec.
26: Increased nel to 1.4 x 10^20 m^-2. Good shot. H-modes from
0.82 - 1.01 sec.
27: Lowered ZXU to 0. No H-mode. RF up to 2.5 MW. No H-mode.
Neutral pressure much higher apparently prevented the
H-mode through changes in recycling.
28: Reloaded shot 26. Gas and density feedback shut off at
0.65 sec. Med Li pellet at 0.65 sec. No pellet. H-modes
from 0.82 - 0.97 sec.
29: Li pellet at 0.65 sec. 2.8 MW of RF. No H-mode. Disrupted
at 1.03 sec. EF1U fault at 1.0 sec.
30: Reloaded shot 26, then set ZXU to 2 cm. Fizzle.
31: Try again. Good shot. Two very short H-modes 0.83 - 0.84
and 0.9 - 0.91 sec.

Session Leader Comments

Jun 2 1995 08:39:43:830AM Steve Golovato run 950602 - continue search for better h--modes at 5.3 T

(1) start with shot 950523017, a higher triangularity configuration,
vary outer gap to keep rf from tripping during h-mode.
(2) go to higher triangularity, at the expense of elongation and
running limited if necessary.
(3) density scan, revisit lower densities where thresholds are lower,
see how much power we can get in.

Jun 2 1995 08:54:58:400AM 950602001 Steve Golovato shot 950602001 - loaded shot 950523017
plasma and rf worked. no h-modes. 2.3mw, 1.5e20
got x-point on upper inner wall, unlike shot 950523017.
got disruptions with configurations like this last time.

Jun 2 1995 09:03:12:120AM 950602002 Steve Golovato shot 950602002 - disrupted early before rf
looks like moly injection, we'll have moly mon next shot.

Jun 2 1995 09:19:31:350AM 950602003 Steve Golovato shot 950602003 - plasma, no h-modes, 2.1mw. still have
upper inner wall x-point. will try to get rid of it.

Jun 2 1995 09:36:28:580AM 950602004 Steve Golovato shot 950602004 - plasma, 2.2mw. similar to shot 003.
inner wall x-point later in time, making progress.
camac problems for rf data on shots 003 and 004, timing incorrect.

Jun 2 1995 09:49:41:690AM 950602005 Steve Golovato shot 950602005 - plasma, 2.2mw. no h-modes.
rf camac problems continue.

Jun 2 1995 10:02:12:260AM 950602006 Steve Golovato shot 950602006- plasma, 2.2mw. same as previous shots.
rf data timing fixed.

Jun 2 1995 10:26:00:360AM 950602007 Steve Golovato shot 950602007- reload shot 950523009, the standard configuration
which gave multiple h-modes. see if we still get them.
plasma, h-modes. daq1 problems this shot.

Jun 2 1995 10:40:19:760AM 950602008 Steve Golovato shot 950602008 - repeat but moved upper x-point up a little, see
effect on h-modes.

plasma, multiple h-modes. 2.5mw, some rf trips.

Jun 2 1995 10:50:23:900AM 950602008 Steve Golovato shot 950602008 - repeat but moved upper x-point up a little, see
effect on h-modes.

plasma, multiple h-modes. 2.5mw, some rf trips.

Jun 2 1995 11:05:00:690AM 950602009 Steve Golovato shot 950602009 - repeat. plasma. continuous elmy h-mode.
2.65mw.

Jun 2 1995 11:06:53:350AM 950602010 Steve Golovato shot 950602010 - back to shot 006, higher triangularity.
move plasma out at 750ms.

plasma, no rf. no h-modes.

Jun 2 1995 11:33:18:280AM 950602011 Steve Golovato shot 950602011 - lower nl04 to 1.4 form 1.5e20. shots with h-mode
today and on 950523 had lower nl04.

brian has been telling us the last two h-mode runs that getting h-modes
is well correlated with midplane pressure. we get them when it is
below 0.4mtorr. this is consistent with today's data. we get higher
edge pressure when the upper x-point is closer in.

plasma, no h-mode.

Jun 2 1995 11:39:37:960AM 950602012 Steve Golovato shot 950602012 - lower nl04 to 1.4 form 1.5e20. this was not done
for previous shot.

plasma. 2.55mw. got very brief h-mode at 930ms. we're moving in right
direction, still have nl too high.

Jun 2 1995 12:00:39:930PM 950602013 Steve Golovato shot 950602013 - nl04 to 1.35, less pre-programmed gas.

plasma, h-modes, two elm-free periods. midplane gas below 0.4mtorr
nl04=1.4e20, 2.55mw.

Jun 2 1995 12:18:54:480PM 950602014 Steve Golovato shot 950602014 - lower nl, gas off earlier.

plasma, 3 h-modes. rf trips end elm-free periods.

Jun 2 1995 12:34:50:910PM 950602015 Steve Golovato shot 950602015 - tune rf to avoid trips.

plasma, 4 elm-free periods, no trips. 2.55mw.

Jun 2 1995 12:48:32:960PM 950602016 Steve Golovato shot 950602016 - lower nl04 to 1.1e20.

plasma, initial elm-free density rise followed by jumps back
and forth from l to h, but no clear elmy phases. 2pi bolo
sees oscillation from low level elms to elm-free which correlate
with density downs and ups.

Jun 2 1995 12:56:07:680PM 950602017 Steve Golovato shot 950602017 - lower nl04 to 0.9e20.

runaway shot.

Jun 2 1995 01:10:44:250PM 950602018 Steve Golovato shot 950602018 - try again.

plasma. early disruption.

Jun 2 1995 01:21:19:560PM 950602019 Steve Golovato shot 950602019 - plasma, dithering. 2.25mw, nl04=1.e20

Jun 2 1995 01:36:46:040PM 950602020 Steve Golovato shot 950602020 - lower to nl04 to 0.7e20.

plasma, early disruption, moly injection.

Jun 2 1995 01:58:30:350PM 950602021 Steve Golovato shot 950602021 - try again.

plasma, disrupted at 860ms. no h-mode at 2.2mw, nl04=0.7e20.

Jun 2 1995 02:13:42:840PM 950602022 Steve Golovato shot 950602022 - reload shot 015, which had nl04=1.25e20. moving
plasma up and lower x-point in to get more sol flux to map into
divertor.

fizzle.

Jun 2 1995 03:10:46:780PM 950602023 Steve Golovato shot 950602023 - plasma, some hards, h-modes. 2.25mw.

got more flux into divertor on outside. h-modes not as good.

Jun 2 1995 03:28:01:130PM 950602024 Steve Golovato shot 950602024 - move upper x-point further out to get more sol
to map around to inner lower divertor, which is on top of nose
for this configuration. lower triang = 0.7 for last shot.

plasma. several h-modes but not longer.

Jun 2 1995 03:47:02:570PM 950602025 Steve Golovato shot 950602025 - more configuration twiddling.

plasma, several h-modes. much like the last shot.

Jun 2 1995 03:59:41:870PM 950602026 Steve Golovato shot 950602026 - raise density to nl04=1.4e20

plasma with several h-modes, simlar to other shots. 40ms elm-free

Jun 2 1995 04:22:14:030PM 950602027 Steve Golovato shot 950602027 - move upper x-point down instead of up as we have been
moving it.

plasma, no h-modes. 2.6mw. midplane pressure much higher.

Jun 2 1995 04:45:12:270PM 950602028 Steve Golovato shot 950602028 - reload shot 026, shoot Li pellet at 650ms and turn off
gas. fire rf at 750ms after pellet density decays but with no gas
fueling.

plasma. several h-modes. 2.65mw.

Jun 2 1995 04:47:05:900PM 950602029 Steve Golovato shot 950602029 - last shot had no pellet. this one with pellet
had no h-modes and density fell to nl04=0.5e20. 2.8mw

Jun 2 1995 04:49:05:770PM 950602030 Steve Golovato shot 950602030 - reload shot 026 and adjust zxu to be about half the
change made for shot 027, lowering it by 3.cm instead of 5cm.

fizzle.

Jun 2 1995 05:03:30:330PM 950602031 Steve Golovato shot 950602031 - try it again.

plasma, two wimpy h-modes. 2.7mw.

Physics Operator Comments

Jun 2 1995 08:56:02:440AM 950602001 Joseph Snipes MP078A ICRF H-mode Run
Engineer in charge: Vince Bertolino
Physics Operator: Joseph Snipes
Session Leader: Steve Golovato

Shot 1
Copied shot 950523017. Good shot.

Jun 2 1995 09:05:57:020AM 950602002 Joseph Snipes Shot 2
Removed the step in RCUR from 0.75 sec to 1.05 sec. to try to increase the
outer gap. Disrupted at 0.74 sec. Probably a moly injection at 0.69 sec.

Jun 2 1995 09:32:43:230AM 950602004 Joseph Snipes Shot 4
Moved ZXU up from 0.5 sec to 4.5 cm then up to 4.75 cm from 0.6 to 1 sec.
Extended gas pre-programming on both A side and B top valves to 1 sec. Good
shot. No H-mode with 2.3 MW of RF. RF timing error.

Jun 2 1995 09:59:50:460AM 950602005 Joseph Snipes Shot 5
Moved ZXU up to 5 cm from 0.6 to 1 sec. Good shot. No H-mode. RF up to 2.3 MW.

Jun 2 1995 10:11:03:260AM 950602006 Joseph Snipes Shot 6
Moved ZXU up by 0.5 cm and RXU out by 0.5 cm. Good shot. No H-mode.
RF up to 2.3 MW. Good configuration with high triangularity.

Jun 2 1995 10:26:22:750AM 950602007 Joseph Snipes Shot 7
Reloaded shot 950523009. Good shot. ELM-free 0.8 - 0.85 sec then ELMy 0.9 to
1.01 sec.

Jun 2 1995 10:41:49:490AM 950602008 Joseph Snipes Shot 8
Moved ZXU up to 5.5 cm from 0.5 to 1 sec. Zirconium injection at 0.94 sec.
Good shot. ELM-free and ELMy H-modes from 0.79 - 1.02 sec.

Jun 2 1995 11:07:00:090AM 950602009 Joseph Snipes Shot 9
Repeat. Good shot. ELMy H-mode from 0.79 - 0.95 sec.

Jun 2 1995 11:08:50:660AM 950602010 Joseph Snipes Shot 10
Returned to shot 6 with a step in RCUR from 0.75 to 1.05 sec. Good shot.
No RF. No H-mode.

Jun 2 1995 11:35:57:660AM 950602011 Joseph Snipes Shot 11
Repeat. Good shot. No H-mode.

Jun 2 1995 11:38:53:220AM 950602012 Joseph Snipes Shot 12
Lowered nel to 1.4 x 10^20 m^-2. Good shot. Short H-mode 0.94 - 0.95 sec.

Jun 2 1995 11:58:22:620AM 950602013 Joseph Snipes Shot 13
Lowered nel to 1.35 x 10^20 m^-2. Turned off pre-programmed gas feed at 0.8
sec. Good shot. H-modes 0.88 - 0.92 and 0.99 - 1.01 sec.

Jun 2 1995 12:08:52:460PM 950602014 Joseph Snipes Shot 14
Lowered nel to 1.25 x 10^20 m^-2. Turned off pre-programmed gas feed at 0.75
sec. Good shot. 3 ELM-free H-modes 0.85 - 1.01 sec.

Jun 2 1995 12:42:07:120PM 950602015 Joseph Snipes Shot 15
Repeat to tune RF. Good shot. 4 ELM-free H-modes 0.85 - 1.01 sec.

Jun 2 1995 12:45:48:600PM 950602016 Joseph Snipes Shot 16
Lowered nel to 1.1 x 10^20 m^-2. Good shot. In and out of H-mode from 0.85 -
1.03 sec.

Jun 2 1995 12:55:23:950PM 950602017 Joseph Snipes Shot 17
Lowered nel to 0.9 x 10^20 m^-2. Bad shot. Hard x rays from the current rise.
Disrupted at 0.38 sec.

Jun 2 1995 01:08:51:550PM 950602018 Joseph Snipes Shot 18
Try again. Bad shot. Disrupted at 0.48 sec.

Jun 2 1995 01:10:36:040PM 950602018 Joseph Snipes Shot 18
Try again. Bad shot. Disrupted at 0.48 sec. Increased prefill to 1.9 x 10^-5
Torr.

Jun 2 1995 01:25:27:800PM 950602019 Joseph Snipes Shot 19
Reduced early gas a bit. OK shot. 2.2 MW of RF, dithering during RF. Very
high radiated power.

Jun 2 1995 01:39:17:220PM 950602020 Joseph Snipes Shot 20
Reduced nel to 7 x 10^19 m^-2. Bad shot. Disrupted at 0.6 sec.

Jun 2 1995 01:49:51:700PM 950602021 Joseph Snipes Shot 21
Bad shot. Disrupted at 0.86 sec. during the RF.

Jun 2 1995 02:33:35:340PM 950602022 Joseph Snipes Shot 22
Returning to shot 15 with B top enabled. RXL moved in 2 cm, ZXL moved up 3 cm,
and ZCUR moved up to +0.5 cm. ZXU moved up by 2 cm to 7.5 cm. Fizzle.
There is a problem with the TF in that the field only reaches 5.1 T. The
problem has been there since shot 15. Short delay to investigate.

Jun 2 1995 03:11:24:500PM 950602023 Joseph Snipes Shot 23
Prefill set to 1.7 x 10^-5 Torr. Good shot. 2 ELM-free H-modes from 0.85 -
0.92 sec.

Jun 2 1995 03:26:42:190PM 950602024 Joseph Snipes Shot 24
Prefill set to 1.8 x 10^-5 Torr. Changed ZXU controller reference to 0.44 m
and shifted the waveform to start at - 5 cm and ramp to + 5 cm. Good shot.
Several H-modes from 0.81 - 0.99 sec.

Jun 2 1995 04:01:41:500PM 950602025 Joseph Snipes Shot 25
Increased ZXU to 7.5 cm. Moved ramp in RXL to 0.45 sec. Good shot. H-modes
from 0.81 to 1.01 sec.

Jun 2 1995 04:05:51:380PM 950602026 Joseph Snipes Shot 26
Increased nel to 1.4 x 10^20 m^-2. Good shot. H-modes from 0.81 to 1.01 sec.

Jun 2 1995 04:21:11:250PM 950602027 Joseph Snipes Shot 27
Lowered ZXU to 0. Good shot. RF up to 2.5 MW. No H-mode. Neutral pressure
much higher apparently prevented the H-mode through changes in recycling.

Jun 2 1995 04:36:30:840PM 950602028 Joseph Snipes Shot 28
Reloaded shot 26. Gas and density feedback shut off at 0.65 sec. Med Li pellet
at 0.65 sec. No pellet. H-modes from 0.82 - 0.97 sec.

Jun 2 1995 04:46:37:400PM 950602029 Joseph Snipes Shot 29
Medium Li pellet at 0.65 sec. 2.8 MW of RF. No H-mode. Disrupted at 1.03 sec.

Jun 2 1995 04:55:22:420PM 950602029 Joseph Snipes Shot 29
EF1U failed at 1.0 sec, leading to the disruption.

Jun 2 1995 04:49:56:070PM 950602030 Joseph Snipes Shot 30
Reloaded shot 26, then set ZXU to 2 cm. Fizzle.

Jun 2 1995 05:09:59:910PM 950602031 Joseph Snipes Shot 31
Try again. Good shot. Two very short H-modes 0.83 - 0.84 and 0.9 - 0.91 sec.

Engineering Operator Comments

Shot Time Type Status Comment

1 08:38:02:560AM Plasma Ok

2 08:56:37:280AM Plasma Ok

3 09:07:21:630AM Plasma Ok

4 09:22:27:110AM Plasma Ok

5 09:35:27:070AM Plasma Ok

6 09:56:21:760AM Plasma Ok

7 10:10:22:660AM Plasma Ok

8 10:28:52:410AM Plasma Ok

9 10:43:55:670AM Plasma Ok

10 11:01:32:040AM Plasma Ok

11 11:16:39:940AM Plasma Ok

12 11:29:53:610AM Plasma Ok

13 11:43:02:790AM Plasma Ok

14 12:00:17:920PM Plasma Ok

15 12:16:32:080PM Plasma Ok

16 12:32:39:000PM Plasma Ok

17 12:46:27:970PM Plasma Ok

18 12:56:27:380PM Plasma Ok

19 01:08:20:040PM Plasma Ok

20 01:28:12:580PM Plasma Ok

21 01:38:41:640PM Plasma Ok

22 02:07:10:940PM Plasma Ok

23 02:42:49:080PM Plasma Bad tf current low

24 03:11:53:010PM Plasma Ok

25 03:30:19:720PM Plasma Ok

26 03:43:07:160PM Plasma Ok

27 04:00:35:140PM Plasma Ok

28 04:23:17:910PM Plasma Ok

29 04:36:29:950PM Plasma Ok Ef1U one SCR not conducting

30 04:47:33:090PM Plasma Ok

31 04:57:40:460PM Plasma Ok

Session Leader Comments
Jun 2 1995 08:39:43:830AM		Steve Golovato	run 950602 - continue search for better h--modes at 5.3 T (1) start with shot 950523017, a higher triangularity configuration, vary outer gap to keep rf from tripping during h-mode. (2) go to higher triangularity, at the expense of elongation and running limited if necessary. (3) density scan, revisit lower densities where thresholds are lower, see how much power we can get in.
Jun 2 1995 08:54:58:400AM	950602001	Steve Golovato	shot 950602001 - loaded shot 950523017 plasma and rf worked. no h-modes. 2.3mw, 1.5e20 got x-point on upper inner wall, unlike shot 950523017. got disruptions with configurations like this last time.
Jun 2 1995 09:03:12:120AM	950602002	Steve Golovato	shot 950602002 - disrupted early before rf looks like moly injection, we'll have moly mon next shot.
Jun 2 1995 09:19:31:350AM	950602003	Steve Golovato	shot 950602003 - plasma, no h-modes, 2.1mw. still have upper inner wall x-point. will try to get rid of it.
Jun 2 1995 09:36:28:580AM	950602004	Steve Golovato	shot 950602004 - plasma, 2.2mw. similar to shot 003. inner wall x-point later in time, making progress. camac problems for rf data on shots 003 and 004, timing incorrect.
Jun 2 1995 09:49:41:690AM	950602005	Steve Golovato	shot 950602005 - plasma, 2.2mw. no h-modes. rf camac problems continue.
Jun 2 1995 10:02:12:260AM	950602006	Steve Golovato	shot 950602006- plasma, 2.2mw. same as previous shots. rf data timing fixed.
Jun 2 1995 10:26:00:360AM	950602007	Steve Golovato	shot 950602007- reload shot 950523009, the standard configuration which gave multiple h-modes. see if we still get them. plasma, h-modes. daq1 problems this shot.
Jun 2 1995 10:40:19:760AM	950602008	Steve Golovato	shot 950602008 - repeat but moved upper x-point up a little, see effect on h-modes. plasma, multiple h-modes. 2.5mw, some rf trips.
Jun 2 1995 10:50:23:900AM	950602008	Steve Golovato	shot 950602008 - repeat but moved upper x-point up a little, see effect on h-modes. plasma, multiple h-modes. 2.5mw, some rf trips.
Jun 2 1995 11:05:00:690AM	950602009	Steve Golovato	shot 950602009 - repeat. plasma. continuous elmy h-mode. 2.65mw.
Jun 2 1995 11:06:53:350AM	950602010	Steve Golovato	shot 950602010 - back to shot 006, higher triangularity. move plasma out at 750ms. plasma, no rf. no h-modes.
Jun 2 1995 11:33:18:280AM	950602011	Steve Golovato	shot 950602011 - lower nl04 to 1.4 form 1.5e20. shots with h-mode today and on 950523 had lower nl04. brian has been telling us the last two h-mode runs that getting h-modes is well correlated with midplane pressure. we get them when it is below 0.4mtorr. this is consistent with today's data. we get higher edge pressure when the upper x-point is closer in. plasma, no h-mode.
Jun 2 1995 11:39:37:960AM	950602012	Steve Golovato	shot 950602012 - lower nl04 to 1.4 form 1.5e20. this was not done for previous shot. plasma. 2.55mw. got very brief h-mode at 930ms. we're moving in right direction, still have nl too high.
Jun 2 1995 12:00:39:930PM	950602013	Steve Golovato	shot 950602013 - nl04 to 1.35, less pre-programmed gas. plasma, h-modes, two elm-free periods. midplane gas below 0.4mtorr nl04=1.4e20, 2.55mw.
Jun 2 1995 12:18:54:480PM	950602014	Steve Golovato	shot 950602014 - lower nl, gas off earlier. plasma, 3 h-modes. rf trips end elm-free periods.
Jun 2 1995 12:34:50:910PM	950602015	Steve Golovato	shot 950602015 - tune rf to avoid trips. plasma, 4 elm-free periods, no trips. 2.55mw.
Jun 2 1995 12:48:32:960PM	950602016	Steve Golovato	shot 950602016 - lower nl04 to 1.1e20. plasma, initial elm-free density rise followed by jumps back and forth from l to h, but no clear elmy phases. 2pi bolo sees oscillation from low level elms to elm-free which correlate with density downs and ups.
Jun 2 1995 12:56:07:680PM	950602017	Steve Golovato	shot 950602017 - lower nl04 to 0.9e20. runaway shot.
Jun 2 1995 01:10:44:250PM	950602018	Steve Golovato	shot 950602018 - try again. plasma. early disruption.
Jun 2 1995 01:21:19:560PM	950602019	Steve Golovato	shot 950602019 - plasma, dithering. 2.25mw, nl04=1.e20
Jun 2 1995 01:36:46:040PM	950602020	Steve Golovato	shot 950602020 - lower to nl04 to 0.7e20. plasma, early disruption, moly injection.
Jun 2 1995 01:58:30:350PM	950602021	Steve Golovato	shot 950602021 - try again. plasma, disrupted at 860ms. no h-mode at 2.2mw, nl04=0.7e20.
Jun 2 1995 02:13:42:840PM	950602022	Steve Golovato	shot 950602022 - reload shot 015, which had nl04=1.25e20. moving plasma up and lower x-point in to get more sol flux to map into divertor. fizzle.
Jun 2 1995 03:10:46:780PM	950602023	Steve Golovato	shot 950602023 - plasma, some hards, h-modes. 2.25mw. got more flux into divertor on outside. h-modes not as good.
Jun 2 1995 03:28:01:130PM	950602024	Steve Golovato	shot 950602024 - move upper x-point further out to get more sol to map around to inner lower divertor, which is on top of nose for this configuration. lower triang = 0.7 for last shot. plasma. several h-modes but not longer.
Jun 2 1995 03:47:02:570PM	950602025	Steve Golovato	shot 950602025 - more configuration twiddling. plasma, several h-modes. much like the last shot.
Jun 2 1995 03:59:41:870PM	950602026	Steve Golovato	shot 950602026 - raise density to nl04=1.4e20 plasma with several h-modes, simlar to other shots. 40ms elm-free
Jun 2 1995 04:22:14:030PM	950602027	Steve Golovato	shot 950602027 - move upper x-point down instead of up as we have been moving it. plasma, no h-modes. 2.6mw. midplane pressure much higher.
Jun 2 1995 04:45:12:270PM	950602028	Steve Golovato	shot 950602028 - reload shot 026, shoot Li pellet at 650ms and turn off gas. fire rf at 750ms after pellet density decays but with no gas fueling. plasma. several h-modes. 2.65mw.
Jun 2 1995 04:47:05:900PM	950602029	Steve Golovato	shot 950602029 - last shot had no pellet. this one with pellet had no h-modes and density fell to nl04=0.5e20. 2.8mw
Jun 2 1995 04:49:05:770PM	950602030	Steve Golovato	shot 950602030 - reload shot 026 and adjust zxu to be about half the change made for shot 027, lowering it by 3.cm instead of 5cm. fizzle.
Jun 2 1995 05:03:30:330PM	950602031	Steve Golovato	shot 950602031 - try it again. plasma, two wimpy h-modes. 2.7mw.

Physics Operator Comments
Jun 2 1995 08:56:02:440AM	950602001	Joseph Snipes	MP078A ICRF H-mode Run Engineer in charge: Vince Bertolino Physics Operator: Joseph Snipes Session Leader: Steve Golovato Shot 1 Copied shot 950523017. Good shot.
Jun 2 1995 09:05:57:020AM	950602002	Joseph Snipes	Shot 2 Removed the step in RCUR from 0.75 sec to 1.05 sec. to try to increase the outer gap. Disrupted at 0.74 sec. Probably a moly injection at 0.69 sec.
Jun 2 1995 09:32:43:230AM	950602004	Joseph Snipes	Shot 4 Moved ZXU up from 0.5 sec to 4.5 cm then up to 4.75 cm from 0.6 to 1 sec. Extended gas pre-programming on both A side and B top valves to 1 sec. Good shot. No H-mode with 2.3 MW of RF. RF timing error.
Jun 2 1995 09:59:50:460AM	950602005	Joseph Snipes	Shot 5 Moved ZXU up to 5 cm from 0.6 to 1 sec. Good shot. No H-mode. RF up to 2.3 MW.
Jun 2 1995 10:11:03:260AM	950602006	Joseph Snipes	Shot 6 Moved ZXU up by 0.5 cm and RXU out by 0.5 cm. Good shot. No H-mode. RF up to 2.3 MW. Good configuration with high triangularity.
Jun 2 1995 10:26:22:750AM	950602007	Joseph Snipes	Shot 7 Reloaded shot 950523009. Good shot. ELM-free 0.8 - 0.85 sec then ELMy 0.9 to 1.01 sec.
Jun 2 1995 10:41:49:490AM	950602008	Joseph Snipes	Shot 8 Moved ZXU up to 5.5 cm from 0.5 to 1 sec. Zirconium injection at 0.94 sec. Good shot. ELM-free and ELMy H-modes from 0.79 - 1.02 sec.
Jun 2 1995 11:07:00:090AM	950602009	Joseph Snipes	Shot 9 Repeat. Good shot. ELMy H-mode from 0.79 - 0.95 sec.
Jun 2 1995 11:08:50:660AM	950602010	Joseph Snipes	Shot 10 Returned to shot 6 with a step in RCUR from 0.75 to 1.05 sec. Good shot. No RF. No H-mode.
Jun 2 1995 11:35:57:660AM	950602011	Joseph Snipes	Shot 11 Repeat. Good shot. No H-mode.
Jun 2 1995 11:38:53:220AM	950602012	Joseph Snipes	Shot 12 Lowered nel to 1.4 x 10^20 m^-2. Good shot. Short H-mode 0.94 - 0.95 sec.
Jun 2 1995 11:58:22:620AM	950602013	Joseph Snipes	Shot 13 Lowered nel to 1.35 x 10^20 m^-2. Turned off pre-programmed gas feed at 0.8 sec. Good shot. H-modes 0.88 - 0.92 and 0.99 - 1.01 sec.
Jun 2 1995 12:08:52:460PM	950602014	Joseph Snipes	Shot 14 Lowered nel to 1.25 x 10^20 m^-2. Turned off pre-programmed gas feed at 0.75 sec. Good shot. 3 ELM-free H-modes 0.85 - 1.01 sec.
Jun 2 1995 12:42:07:120PM	950602015	Joseph Snipes	Shot 15 Repeat to tune RF. Good shot. 4 ELM-free H-modes 0.85 - 1.01 sec.
Jun 2 1995 12:45:48:600PM	950602016	Joseph Snipes	Shot 16 Lowered nel to 1.1 x 10^20 m^-2. Good shot. In and out of H-mode from 0.85 - 1.03 sec.
Jun 2 1995 12:55:23:950PM	950602017	Joseph Snipes	Shot 17 Lowered nel to 0.9 x 10^20 m^-2. Bad shot. Hard x rays from the current rise. Disrupted at 0.38 sec.
Jun 2 1995 01:08:51:550PM	950602018	Joseph Snipes	Shot 18 Try again. Bad shot. Disrupted at 0.48 sec.
Jun 2 1995 01:10:36:040PM	950602018	Joseph Snipes	Shot 18 Try again. Bad shot. Disrupted at 0.48 sec. Increased prefill to 1.9 x 10^-5 Torr.
Jun 2 1995 01:25:27:800PM	950602019	Joseph Snipes	Shot 19 Reduced early gas a bit. OK shot. 2.2 MW of RF, dithering during RF. Very high radiated power.
Jun 2 1995 01:39:17:220PM	950602020	Joseph Snipes	Shot 20 Reduced nel to 7 x 10^19 m^-2. Bad shot. Disrupted at 0.6 sec.
Jun 2 1995 01:49:51:700PM	950602021	Joseph Snipes	Shot 21 Bad shot. Disrupted at 0.86 sec. during the RF.
Jun 2 1995 02:33:35:340PM	950602022	Joseph Snipes	Shot 22 Returning to shot 15 with B top enabled. RXL moved in 2 cm, ZXL moved up 3 cm, and ZCUR moved up to +0.5 cm. ZXU moved up by 2 cm to 7.5 cm. Fizzle. There is a problem with the TF in that the field only reaches 5.1 T. The problem has been there since shot 15. Short delay to investigate.
Jun 2 1995 03:11:24:500PM	950602023	Joseph Snipes	Shot 23 Prefill set to 1.7 x 10^-5 Torr. Good shot. 2 ELM-free H-modes from 0.85 - 0.92 sec.
Jun 2 1995 03:26:42:190PM	950602024	Joseph Snipes	Shot 24 Prefill set to 1.8 x 10^-5 Torr. Changed ZXU controller reference to 0.44 m and shifted the waveform to start at - 5 cm and ramp to + 5 cm. Good shot. Several H-modes from 0.81 - 0.99 sec.
Jun 2 1995 04:01:41:500PM	950602025	Joseph Snipes	Shot 25 Increased ZXU to 7.5 cm. Moved ramp in RXL to 0.45 sec. Good shot. H-modes from 0.81 to 1.01 sec.
Jun 2 1995 04:05:51:380PM	950602026	Joseph Snipes	Shot 26 Increased nel to 1.4 x 10^20 m^-2. Good shot. H-modes from 0.81 to 1.01 sec.
Jun 2 1995 04:21:11:250PM	950602027	Joseph Snipes	Shot 27 Lowered ZXU to 0. Good shot. RF up to 2.5 MW. No H-mode. Neutral pressure much higher apparently prevented the H-mode through changes in recycling.
Jun 2 1995 04:36:30:840PM	950602028	Joseph Snipes	Shot 28 Reloaded shot 26. Gas and density feedback shut off at 0.65 sec. Med Li pellet at 0.65 sec. No pellet. H-modes from 0.82 - 0.97 sec.
Jun 2 1995 04:46:37:400PM	950602029	Joseph Snipes	Shot 29 Medium Li pellet at 0.65 sec. 2.8 MW of RF. No H-mode. Disrupted at 1.03 sec.
Jun 2 1995 04:55:22:420PM	950602029	Joseph Snipes	Shot 29 EF1U failed at 1.0 sec, leading to the disruption.
Jun 2 1995 04:49:56:070PM	950602030	Joseph Snipes	Shot 30 Reloaded shot 26, then set ZXU to 2 cm. Fizzle.
Jun 2 1995 05:09:59:910PM	950602031	Joseph Snipes	Shot 31 Try again. Good shot. Two very short H-modes 0.83 - 0.84 and 0.9 - 0.91 sec.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:38:02:560AM	Plasma	Ok
2	08:56:37:280AM	Plasma	Ok
3	09:07:21:630AM	Plasma	Ok
4	09:22:27:110AM	Plasma	Ok
5	09:35:27:070AM	Plasma	Ok
6	09:56:21:760AM	Plasma	Ok
7	10:10:22:660AM	Plasma	Ok
8	10:28:52:410AM	Plasma	Ok
9	10:43:55:670AM	Plasma	Ok
10	11:01:32:040AM	Plasma	Ok
11	11:16:39:940AM	Plasma	Ok
12	11:29:53:610AM	Plasma	Ok
13	11:43:02:790AM	Plasma	Ok
14	12:00:17:920PM	Plasma	Ok
15	12:16:32:080PM	Plasma	Ok
16	12:32:39:000PM	Plasma	Ok
17	12:46:27:970PM	Plasma	Ok
18	12:56:27:380PM	Plasma	Ok
19	01:08:20:040PM	Plasma	Ok
20	01:28:12:580PM	Plasma	Ok
21	01:38:41:640PM	Plasma	Ok
22	02:07:10:940PM	Plasma	Ok
23	02:42:49:080PM	Plasma	Bad	tf current low
24	03:11:53:010PM	Plasma	Ok
25	03:30:19:720PM	Plasma	Ok
26	03:43:07:160PM	Plasma	Ok
27	04:00:35:140PM	Plasma	Ok
28	04:23:17:910PM	Plasma	Ok
29	04:36:29:950PM	Plasma	Ok	Ef1U one SCR not conducting
30	04:47:33:090PM	Plasma	Ok
31	04:57:40:460PM	Plasma	Ok