Alcator C-Mod Run 1050615 Information

Miniproposals

Miniproposal: 404a

Date Filed: 1/31/2005

Title: Parametric Dependence of Moderate n Alfvén Eigenmode Damping Rates

First Author: Joseph Snipes

Session Leader: Joseph Snipes (shots 1-29)

Operators
Session leader(s):	Joseph Snipes
Physics operator(s):	Robert Granetz
Engineering operator(s):	Sam Pierson,Ed Fitzgerald

Engineering Operator Run Comment
MP#404a Alfven mode study w/active MHD EO Pierson PO Grantetz SL Snipe

Session Leader Plans

Entered: Jun 14 2005 04:40:30:090PM

Author: Joseph Snipes

MP 404a Parametric Dependence of Moderate n Alfvén Eigenmode Damping Rates
Session Leader: Joseph Snipes
Physics Operator: Bob Granetz

We will begin with inner wall limited plasmas (0.8 MA, ramping TF from 6 to 4 T) with shape from 1021003007 with kappa = 1.4. Density set to 1 x 10^19 m^-2. We will first check to see if a resonance can be obtained with ramping field and constant frequency. Then, we will go to constant field and scan the active MHD frequency across the TAE frequency at q=1.5 and look for resonances. Then, we will scan the elongation from 1.1 to 1.8 and then scan the triangularity from 0 to 0.8. Time permitting, we will then choose a middle value of the shape parameters and scan the density from 0.5 to 4 x 10^20 m^-3 to vary the collisionality. If we manage to get all of this done, we will then scan the TF from 2 T to 8 T. No ICRF is required for this run. Rotation measurements are desirable even though the rotation will be small.

Physics Operators Plans

Entered: Jun 14 2005 06:15:18:480PM

Author: Robert Granetz

I loaded segment 2 from 1021003007, then made all the required configuration
changes (rog_cd -> rog_fg, pulse_gas5 -> acoil, put proper waveform for a-coil,
remove offset from clearin and ip, etcetera).

Then I adjusted Ip to 0.8 MA (from 0.75) and nl_04 to 1.0e20 m-2 (from 0.9).

I saved this as shot 1050615000 in /home/granetz/pcs_scratch. I also loaded
into the model file.

Entered: Jun 15 2005 09:40:39:490AM

Author: Robert Granetz

My run plan mistakenly called for helium plasmas. This error was caught just as we went into init for
shot 2. We switched to deuterium plasmas after shot 2.

Entered: Jun 15 2005 05:32:23:573PM

Author: Robert Granetz

Engineering setup for Wednesday, 15 June 2005

MP #404a Alfven mode studies w/active MHD

Session leader: J. Snipes
Physics operator: R. Granetz

No overnight ECDC, but bake at 60 C.

Run begins at 09:00 and ends at 17:00.

Power systems as on 1021003007 (0.73 MA, 6 T, inner wall limited)

A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled.

Gas Setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1)
leave B-side upper with whatever Hybrid disabled
fill B-main (C-side) with 30 psi He Hybrid enabled (PG3) <-- Mistake. Should have been D2.
NINJA not used today

Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo shutters

Important Diagnostics:
HIREX, PCI, fast magnetics

-------------------------------------------------------------------------------
ICRF Setup: No ICRF needed.

-------------------------------------------------------------------------------
Run plan: Vary everything over a huge range and use the active MHD antennas
and new amplifiers to drive TAE's, and measure their damping
rate. Read the session leader's run plan for more details.

Session Leader Summaries

Entered: Jun 15 2005 05:39:21:360PM

Author: Joseph Snipes

The run was a struggle from the beginning. The physop called for helium plasmas when the session leader wanted deuterium. Fortunately, Ted Biewer noted it after shot 2 and we changed to deuterium. The automatic capacitor switching amplifiers worked reasonably well with frequency sweeping over +/- 150 kHz range and the DPCS real-time calculation of the TAE frequency worked well together with the sweep to track the TAE frequency throughout the shots including all the changes we made. The lower antenna amplifier has higher harmonics rather than the cleaner sine waves of the upper antenna amplifier. More tests need to be done to track this down and correct it. The elongation was scanned from about 1.65 to 1.15 with inner wall limited plasmas. The last two shots were then taken with SNL for comparison. We also ramped the TF from 6 T down to 4 T and took some shots at constant TF at 5.4 T and at 4.6 T. There were a number of weak resonances found, but further analysis is required to see if we have any clear trends in the damping versus elongation or edge shear. There were 18 useful plasmas for which active MHD data are available. If the resonances are clear enough, we may have a complete elongation scan for inner wall limited plasmas.

Physics Operator Summaries

Entered: Jun 15 2005 05:48:37:553PM

Author: Robert Granetz

Physop summary for Wednesday 15 June 2005:

MP #404a: Alfven mode studies w/active MHD

Session leader: J. Snipes
Physics operator: R. Granetz

Today's run used the new active MHD amplifiers, and involved many inboard
limited plasmas (some also nearly outboard limited), with very low and high
elongations, and Bt sweeps. There were also some diverted plasmas. The
machine ran fairly well, although there were 4 duds and most startups
didn't look very good. There were also a couple of delays due to computer
problems. A number of shots disrupted early due to impurity injections
(for example, see JANT video view, frame 7, shot 1050615021), but there
were also four plasma shots that were essentially wasted by my own physop
errors: shots 1 and 2 were nice plasmas, but they were helium instead of
deuterium because I had inadvertently copied a recent setup from a helium
run and didn't catch that. On shot 14 I moved RCUR by 5 cm instead of 5 mm,
and on shot 28 I loaded most of the PCS programming changes, but then made
some additional changes and forgot to reload them into the model.

Scorecard: 22 plasmas
1 fizzles
4 duds (2 due to power supply problems)
2 tests or no-power shot cycles
----------
29 total shot cycles

Session Leader Comments

Jun 15 2005 09:31:50:820AM 1050615001 Joseph Snipes Granetz went ahead without me on shot 1, when I was seconds away from having the BiRa setup. So, we got a linear frequency ramp from 200 to 800 kHz throughout the shot with a ramp from 6 to 4 T.

Jun 15 2005 09:44:55:130AM 1050615002 Joseph Snipes For shot 2, we were setup with constant frequency at a nominal 420 kHz to attempt to reproduce 2002 resonances with ramping TF and constant active MHD frequency. However, Ted Biewer noticed that we were running helium plasmas because Bob had copied the wrong gas setup from a helium run.

Jun 15 2005 10:02:03:940AM 1050615003 Joseph Snipes Shot 3 is a repeat with deuterium plasmas at constant active MHD frequency. There appears to be a very broad resonance around 1.15 s.

Jun 15 2005 10:14:09:563AM 1050615004 Joseph Snipes Shot 4 has the hybrid TAE frequency enabled ([0,0] on hybrid_local J221:input_09)
with a +/-100 kHz sweep. Density feedback failed at 0.65 s sending the active MHD frequency to 1 MHz.

Jun 15 2005 10:38:25:577AM 1050615005 Joseph Snipes Shot 5 increased the hybrid frequency sweep rate to 1.5 MHz/s. Dud!

Jun 15 2005 10:49:49:087AM 1050615006 Joseph Snipes Shot 6: Ack failure! No power, no data.

Jun 15 2005 11:24:46:390AM 1050615007 Joseph Snipes Shot 7: Good plasma. Hybrid frequency control. Resonances not very clear.

Jun 15 2005 11:24:59:267AM 1050615008 Joseph Snipes Shot 8: Dud!

Jun 15 2005 12:08:04:667PM 1050615009 Joseph Snipes Shot 9: Decrease elongation. Disrupted at 1.5 s.

Jun 15 2005 12:16:33:367PM 1050615010 Joseph Snipes Shot 10: Good shot with higher elongation up to 1.5.

Jun 15 2005 12:17:01:853PM 1050615011 Joseph Snipes Shot 11: Good shot with higher elongation up to 1.7.

Jun 15 2005 12:38:07:500PM 1050615012 Joseph Snipes Shot 12: Repeat with the lower antenna off. Good shot.

Jun 15 2005 12:40:51:490PM 1050615013 Joseph Snipes Shot 13: Changed the sweep amplitude to 150 kHz. Good shot.

Jun 15 2005 01:13:51:610PM 1050615014 Joseph Snipes Shot 14: Increase RCUR to limit outboard. Disrupted at 0.285 s. Physop error.

Jun 15 2005 01:29:04:000PM 1050615015 Joseph Snipes Shot 15: Turned on the lower active MHD antenna again. RCUR increase set to 5 mm instead of 5 cm as on shot 14. Computer problems. No power test shot.

Jun 15 2005 01:49:41:160PM 1050615016 Joseph Snipes Shot 16: Dud!

Jun 15 2005 02:11:16:967PM 1050615017 Joseph Snipes Shot 17: Dud!

Jun 15 2005 02:28:29:357PM 1050615018 Joseph Snipes Shot 18: Finally got a plasma! Good shot.

Jun 15 2005 02:44:07:277PM 1050615019 Joseph Snipes Shot 19: Reduced sweep rate to 0.75 MHz/s. Good shot.

Jun 15 2005 02:45:24:070PM 1050615020 Joseph Snipes Shot 20: Reduced elongation to 1.35. Good shot. Disrupted at 1.38 s.

Jun 15 2005 03:19:00:707PM 1050615021 Joseph Snipes Shot 21: Changed sweep rate to 1.25 MHz/s. Trying for lower elongation. Set constant TF at 5.4 T. Disrupted at 0.128.

Jun 15 2005 03:19:15:520PM 1050615022 Joseph Snipes Shot 22: Constant TF. Good shot.

Jun 15 2005 03:35:54:933PM 1050615023 Joseph Snipes Shot 23: Changed sweep rate to 1 MHz/s and sweep amplitude to 100 kHz. Elongation at 1.27.

Jun 15 2005 03:54:15:397PM 1050615024 Joseph Snipes Shot 24: Trying to lower kappa some more. Disrupted at 0.5 s.

Jun 15 2005 04:17:15:420PM 1050615025 Joseph Snipes Shot 25: Trying to lower kappa some more. Got to kappa = 1.20. Disrupted at 1.5 s.

Jun 15 2005 04:32:51:053PM 1050615026 Joseph Snipes Shot 26: Reduce TF to 4.6 T to center the TAE frequency in a frequency band of the active MHD amplifier. Fizzle!

Jun 15 2005 04:47:08:330PM 1050615027 Joseph Snipes Shot 27: Constant TF at 4.6 T to center the TAE frequency in a frequency band of the active MHD amplifier. Set frequency sweep amplitude to 75 kHz. Disrupted at 0.73 s. Elongation down to 1.15.

Jun 15 2005 05:06:44:480PM 1050615028 Joseph Snipes Shot 28: Try a SNL plasma with small outer gap at 4.6 T. Good shot but the physop did not load the changes and we got 5.4 T instead.

Jun 15 2005 05:18:29:157PM 1050615029 Joseph Snipes Shot 29: Try a SNL plasma with small outer gap at 4.6 T. Disrupted at 1.4 s.

Physics Operator Comments

Jun 15 2005 09:29:00:610AM 1050615001 Robert Granetz Plasma. Good shot. Limited during the flattop. Disrupts upward during rampdown.
Ip=0.8 MA, Btor ramps from 6 to 4 T during flattop. nl_04=1.3 even though gas is
off for most of the shot. Startup was awful...it hit something outside early on.

Next shot: repeat, no changes

NOTE: I mistakenly have the machine set up with helium for the plasma. (I copied
the run plan from a helium run day and didn't catch it.)

Jun 15 2005 09:35:52:430AM 1050615002 Robert Granetz Plasma. Good shot, but helium plasma. We want deuterium. My mistake. Limited, Btor ramp. Density is
still high.

Next shot: change over to D2. Turn on argon (50 ms pulse). Tweak ZXU late in shot.

Jun 15 2005 10:01:16:237AM 1050615003 Robert Granetz Plasma. Good shot. Deuterium plasma this time (and for the rest of the run). Limited, 0.8 MA, Bt sweep.
Startup looked very good. No rampdown disruption this time, but something took a notch out of the plasma
current at t=0.122 during the rampup.

Next shot: Joe will start using the DPCS-calculated real-time Alfven frequency.

Jun 15 2005 10:21:57:417AM 1050615004 Robert Granetz Plasma. Density feedback signal went haywire, resulting in a big density ramp after t=0.7 s.
Startup doesn't look too good...pressure is high.

Next shot: shorten pre-fill pulse by 2 ms.

Jun 15 2005 10:37:51:233AM 1050615005 Robert Granetz Dud. Looks like it wants the higher pre-fill pressure.

Next shot: add the 2 ms back in and another 1 ms for good measure.

Jun 15 2005 10:53:15:233AM 1050615006 Robert Granetz ACK failure. The shot cycle didn't do anything. Strange one.

Next shot: try again.

Jun 15 2005 11:14:01:077AM 1050615007 Robert Granetz Plasma. Good shot. Deuterium. Limited, 0.8 MA, Bt ramp. Kappa=1.35, triangularity=0.22-0.25.
nl_04=1.0e20 m-2, as desired. Still a lousy startup, but don't touch.

Next shot: elongate the plasma by raising ZXL and lowering ZXU, each by 2.5 cm.

Jun 15 2005 11:26:06:633AM 1050615008 Robert Granetz Dud. Null looks okay.

Next shot: add 2 more ms to pre-fill (to 25 ms)

Jun 15 2005 11:43:50:207AM 1050615009 Robert Granetz Plasma. Disrupted at t=1.5 s. Elongation actually went down slightly (1.35 -> 1.30).

Next shot: reload ZXL and ZXU from shot 7 and then increase CLEARIN (i.e. make less negative)
by 1.5 cm.

Jun 15 2005 12:01:35:717PM 1050615010 Robert Granetz Plasma. Good shot. Elongation increased to 1.50-1.55, and still remained limited.
Don't know if it helped the MHD antenna coupling.

Next shot: increase CLEARIN another 0.5 cm to increase elongation even more.

Jun 15 2005 12:11:03:620PM 1050615011 Robert Granetz Plasma. Good shot. Elongation=1.68 - 1.62. Barely stayed limited.

Next shot: repeat, but with only one MHD antenna instead of both.
Also reduce Br0 offset by 0.4 mT.

Jun 15 2005 12:37:53:920PM 1050615012 Robert Granetz Plasma. Good shot. Similar to previous shot.

Next shot: no PCS changes.

Jun 15 2005 12:41:01:630PM 1050615013 Robert Granetz Plasma. Good shot. Similar to previous two shots.

Next shot; increase RCUR by 0.5 cm so that the plasma just barely limits on
the outboard limiter, is still hard limited on the inboard wall, and yet
still maintains high elongation.

Jun 15 2005 01:14:47:270PM 1050615014 Robert Granetz Plasma. Disrupted early because it limited hard on the outer limiter. I moved RCUR by 5 cm rather
that 0.5 cm. Another physop mistake.

Next shot: reload RCUR from shot 13 and move it out 0.5 cm, this time correctly.

Jun 15 2005 01:29:29:767PM 1050615015 Robert Granetz No-power shot cycle. There's a problem with the shot cycle.

Jun 15 2005 01:59:21:780PM 1050615016 Robert Granetz Dud. Br0 is a little low. Pre-fill pressure also dropped a bit.

Next shot: raise Br0 offset back to today's starting value and increase pre-fill
pulse another 2 ms (to 27 ms).

NINJA will puff D2 at t=1.2 s.

Jun 15 2005 02:11:23:670PM 1050615017 Robert Granetz Dud. Everything looks pretty good.

Next shot: add -15 A to IC_EF4 (to -1295 A)

Jun 15 2005 02:28:55:247PM 1050615018 Robert Granetz Plasma. Good shot. Remained limited on inboard wall and outboard gap varied between
3 mm and 0 mm. Kapp=1.6. Startup remains lousy.

Next shot: repeat; no DPCS changes.

Jun 15 2005 02:39:43:793PM 1050615019 Robert Granetz Plasma. Good shot. Similar to previous one.

Next shot: reduce kappa to 1.2-1.3 by decreasing CLEARIN to -4 cm. Keep RCUR the same, so
the outer gap remains close to zero. LPI will move to t=1.6 s (was at 1.75 s).

Jun 15 2005 02:58:28:310PM 1050615020 Robert Granetz Plasma. Disrupted at t=1.38 s. Inboard limited, although the outer gap gets down
to zero just before the disruption. Kappa=1.34.

Next shot: reduce CLEARIN to -4.7 cm and move RCUR in later in the shot.
Also, get rid of the Btor ramp...set Btor to 5.4 T (flat)

Jun 15 2005 03:11:01:337PM 1050615021 Robert Granetz Plasma. Disrupted very early due to impurity injections. Lots of glowing particlulates
can be seen on the JANT video view (frame 7, t=0.211 s)

Next shot: repeat, no changes.

Jun 15 2005 03:27:21:157PM 1050615022 Robert Granetz Plasma. Good shot. Elongation=1.28 until t=1.2 s, then it increases a little.
Outboard gap=2-3 mm.

Next shot: reduce elongation a little more by lowering CLEARIN to -5.0 cm.

Jun 15 2005 03:42:20:997PM 1050615023 Robert Granetz Plasma. Good shot. Elongation=1.26 until t=1.2 s, then increases. So I didn't make
enough of a change to CLEARIN. Also, the outer gap goes to zero late in the flattop.

Next shot: reduce CLEARIN some more (even more later in the shot), and move RCUR in a
little late in the shot.

Jun 15 2005 03:57:21:583PM 1050615024 Robert Granetz Plasma. Disrupted at t=0.50 s due to impurity injection, but I couldn't find it
on any of the video views. Elongation at t=0.5 s is 1.20, which is what we want
for the entire flattop.

Next shot: repeat, no changes.

Jun 15 2005 04:17:01:543PM 1050615025 Robert Granetz Plasma. Good shot. Elongation=1.21 for most of the flattop. Just touched the outer
limiter late in the flattop.

Next shot: lower Bt to 4.6 T and reduce the elongation further (CLEARIN) and move
RCUR a little again, late in the shot.

Jun 15 2005 04:28:12:447PM 1050615026 Robert Granetz Fizzle.

Next shot: reduce pre-fill by 2 ms, lower Br0 offset by 0.1 mT.

Jun 15 2005 04:47:01:517PM 1050615027 Robert Granetz Plasma. Disrupted at t=0.73 s, again due to an injection. Kappa=1.17.

Next shot: load a 1 MA fiducial, but reduce Ip to 0.8 MA, Bt to 4.6 T, and
make the outer gap small.

Jun 15 2005 04:58:19:480PM 1050615028 Robert Granetz Plasma. Good 1 MA, 5.4 T, SNL fiducial, but I didn't want that.

Next shot: 0.8 MA, 4.6 T, small outer gap.

Jun 15 2005 05:18:30:780PM 1050615029 Robert Granetz Plasma. Good shot. Disrupted at t=1.40 s due to an impurity injection. 0.8 MA, 4.6 T, SNL.
Outer gap = 10 -> 9 -> 8 mm. nl_04=1.0e20 m-2.

End of run.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:13:11:737AM Plasma Ok

2 09:26:34:473AM Plasma Ok

3 09:45:34:493AM Plasma Ok

4 10:01:38:440AM Plasma Ok

5 10:34:30:857AM Plasma Ok

6 10:47:02:270AM Plasma Ok ack fail

7 11:00:18:883AM Plasma Ok

8 11:20:53:260AM Plasma Ok

9 11:34:30:660AM Plasma Ok

10 11:47:48:113AM Plasma Ok

11 12:01:00:327PM Plasma Ok

12 12:23:59:457PM Plasma Ok

13 12:36:57:150PM Plasma Ok

14 12:49:32:157PM Plasma Ok

15 01:21:38:010PM Plasma Bad no power, data system hang

16 01:48:07:037PM Plasma Ok

17 02:01:31:090PM Plasma Ok

18 02:14:11:513PM Plasma Ok

19 02:29:33:000PM Plasma Ok

20 02:42:01:857PM Plasma Ok

21 03:00:55:527PM Plasma Ok

22 03:16:26:630PM Plasma Ok

23 03:30:54:407PM Plasma Ok

24 03:45:37:447PM Plasma Bad OH2 and OH1 com fault

25 04:07:23:843PM Plasma Ok

26 04:20:30:293PM Plasma Ok

27 04:36:12:880PM Plasma Ok

28 04:51:34:060PM Plasma Ok

29 05:06:09:883PM Plasma Ok

Session Leader Comments
Jun 15 2005 09:31:50:820AM	1050615001	Joseph Snipes	Granetz went ahead without me on shot 1, when I was seconds away from having the BiRa setup. So, we got a linear frequency ramp from 200 to 800 kHz throughout the shot with a ramp from 6 to 4 T.
Jun 15 2005 09:44:55:130AM	1050615002	Joseph Snipes	For shot 2, we were setup with constant frequency at a nominal 420 kHz to attempt to reproduce 2002 resonances with ramping TF and constant active MHD frequency. However, Ted Biewer noticed that we were running helium plasmas because Bob had copied the wrong gas setup from a helium run.
Jun 15 2005 10:02:03:940AM	1050615003	Joseph Snipes	Shot 3 is a repeat with deuterium plasmas at constant active MHD frequency. There appears to be a very broad resonance around 1.15 s.
Jun 15 2005 10:14:09:563AM	1050615004	Joseph Snipes	Shot 4 has the hybrid TAE frequency enabled ([0,0] on hybrid_local J221:input_09) with a +/-100 kHz sweep. Density feedback failed at 0.65 s sending the active MHD frequency to 1 MHz.
Jun 15 2005 10:38:25:577AM	1050615005	Joseph Snipes	Shot 5 increased the hybrid frequency sweep rate to 1.5 MHz/s. Dud!
Jun 15 2005 10:49:49:087AM	1050615006	Joseph Snipes	Shot 6: Ack failure! No power, no data.
Jun 15 2005 11:24:46:390AM	1050615007	Joseph Snipes	Shot 7: Good plasma. Hybrid frequency control. Resonances not very clear.
Jun 15 2005 11:24:59:267AM	1050615008	Joseph Snipes	Shot 8: Dud!
Jun 15 2005 12:08:04:667PM	1050615009	Joseph Snipes	Shot 9: Decrease elongation. Disrupted at 1.5 s.
Jun 15 2005 12:16:33:367PM	1050615010	Joseph Snipes	Shot 10: Good shot with higher elongation up to 1.5.
Jun 15 2005 12:17:01:853PM	1050615011	Joseph Snipes	Shot 11: Good shot with higher elongation up to 1.7.
Jun 15 2005 12:38:07:500PM	1050615012	Joseph Snipes	Shot 12: Repeat with the lower antenna off. Good shot.
Jun 15 2005 12:40:51:490PM	1050615013	Joseph Snipes	Shot 13: Changed the sweep amplitude to 150 kHz. Good shot.
Jun 15 2005 01:13:51:610PM	1050615014	Joseph Snipes	Shot 14: Increase RCUR to limit outboard. Disrupted at 0.285 s. Physop error.
Jun 15 2005 01:29:04:000PM	1050615015	Joseph Snipes	Shot 15: Turned on the lower active MHD antenna again. RCUR increase set to 5 mm instead of 5 cm as on shot 14. Computer problems. No power test shot.
Jun 15 2005 01:49:41:160PM	1050615016	Joseph Snipes	Shot 16: Dud!
Jun 15 2005 02:11:16:967PM	1050615017	Joseph Snipes	Shot 17: Dud!
Jun 15 2005 02:28:29:357PM	1050615018	Joseph Snipes	Shot 18: Finally got a plasma! Good shot.
Jun 15 2005 02:44:07:277PM	1050615019	Joseph Snipes	Shot 19: Reduced sweep rate to 0.75 MHz/s. Good shot.
Jun 15 2005 02:45:24:070PM	1050615020	Joseph Snipes	Shot 20: Reduced elongation to 1.35. Good shot. Disrupted at 1.38 s.
Jun 15 2005 03:19:00:707PM	1050615021	Joseph Snipes	Shot 21: Changed sweep rate to 1.25 MHz/s. Trying for lower elongation. Set constant TF at 5.4 T. Disrupted at 0.128.
Jun 15 2005 03:19:15:520PM	1050615022	Joseph Snipes	Shot 22: Constant TF. Good shot.
Jun 15 2005 03:35:54:933PM	1050615023	Joseph Snipes	Shot 23: Changed sweep rate to 1 MHz/s and sweep amplitude to 100 kHz. Elongation at 1.27.
Jun 15 2005 03:54:15:397PM	1050615024	Joseph Snipes	Shot 24: Trying to lower kappa some more. Disrupted at 0.5 s.
Jun 15 2005 04:17:15:420PM	1050615025	Joseph Snipes	Shot 25: Trying to lower kappa some more. Got to kappa = 1.20. Disrupted at 1.5 s.
Jun 15 2005 04:32:51:053PM	1050615026	Joseph Snipes	Shot 26: Reduce TF to 4.6 T to center the TAE frequency in a frequency band of the active MHD amplifier. Fizzle!
Jun 15 2005 04:47:08:330PM	1050615027	Joseph Snipes	Shot 27: Constant TF at 4.6 T to center the TAE frequency in a frequency band of the active MHD amplifier. Set frequency sweep amplitude to 75 kHz. Disrupted at 0.73 s. Elongation down to 1.15.
Jun 15 2005 05:06:44:480PM	1050615028	Joseph Snipes	Shot 28: Try a SNL plasma with small outer gap at 4.6 T. Good shot but the physop did not load the changes and we got 5.4 T instead.
Jun 15 2005 05:18:29:157PM	1050615029	Joseph Snipes	Shot 29: Try a SNL plasma with small outer gap at 4.6 T. Disrupted at 1.4 s.

Physics Operator Comments
Jun 15 2005 09:29:00:610AM	1050615001	Robert Granetz	Plasma. Good shot. Limited during the flattop. Disrupts upward during rampdown. Ip=0.8 MA, Btor ramps from 6 to 4 T during flattop. nl_04=1.3 even though gas is off for most of the shot. Startup was awful...it hit something outside early on. Next shot: repeat, no changes NOTE: I mistakenly have the machine set up with helium for the plasma. (I copied the run plan from a helium run day and didn't catch it.)
Jun 15 2005 09:35:52:430AM	1050615002	Robert Granetz	Plasma. Good shot, but helium plasma. We want deuterium. My mistake. Limited, Btor ramp. Density is still high. Next shot: change over to D2. Turn on argon (50 ms pulse). Tweak ZXU late in shot.
Jun 15 2005 10:01:16:237AM	1050615003	Robert Granetz	Plasma. Good shot. Deuterium plasma this time (and for the rest of the run). Limited, 0.8 MA, Bt sweep. Startup looked very good. No rampdown disruption this time, but something took a notch out of the plasma current at t=0.122 during the rampup. Next shot: Joe will start using the DPCS-calculated real-time Alfven frequency.
Jun 15 2005 10:21:57:417AM	1050615004	Robert Granetz	Plasma. Density feedback signal went haywire, resulting in a big density ramp after t=0.7 s. Startup doesn't look too good...pressure is high. Next shot: shorten pre-fill pulse by 2 ms.
Jun 15 2005 10:37:51:233AM	1050615005	Robert Granetz	Dud. Looks like it wants the higher pre-fill pressure. Next shot: add the 2 ms back in and another 1 ms for good measure.
Jun 15 2005 10:53:15:233AM	1050615006	Robert Granetz	ACK failure. The shot cycle didn't do anything. Strange one. Next shot: try again.
Jun 15 2005 11:14:01:077AM	1050615007	Robert Granetz	Plasma. Good shot. Deuterium. Limited, 0.8 MA, Bt ramp. Kappa=1.35, triangularity=0.22-0.25. nl_04=1.0e20 m-2, as desired. Still a lousy startup, but don't touch. Next shot: elongate the plasma by raising ZXL and lowering ZXU, each by 2.5 cm.
Jun 15 2005 11:26:06:633AM	1050615008	Robert Granetz	Dud. Null looks okay. Next shot: add 2 more ms to pre-fill (to 25 ms)
Jun 15 2005 11:43:50:207AM	1050615009	Robert Granetz	Plasma. Disrupted at t=1.5 s. Elongation actually went down slightly (1.35 -> 1.30). Next shot: reload ZXL and ZXU from shot 7 and then increase CLEARIN (i.e. make less negative) by 1.5 cm.
Jun 15 2005 12:01:35:717PM	1050615010	Robert Granetz	Plasma. Good shot. Elongation increased to 1.50-1.55, and still remained limited. Don't know if it helped the MHD antenna coupling. Next shot: increase CLEARIN another 0.5 cm to increase elongation even more.
Jun 15 2005 12:11:03:620PM	1050615011	Robert Granetz	Plasma. Good shot. Elongation=1.68 - 1.62. Barely stayed limited. Next shot: repeat, but with only one MHD antenna instead of both. Also reduce Br0 offset by 0.4 mT.
Jun 15 2005 12:37:53:920PM	1050615012	Robert Granetz	Plasma. Good shot. Similar to previous shot. Next shot: no PCS changes.
Jun 15 2005 12:41:01:630PM	1050615013	Robert Granetz	Plasma. Good shot. Similar to previous two shots. Next shot; increase RCUR by 0.5 cm so that the plasma just barely limits on the outboard limiter, is still hard limited on the inboard wall, and yet still maintains high elongation.
Jun 15 2005 01:14:47:270PM	1050615014	Robert Granetz	Plasma. Disrupted early because it limited hard on the outer limiter. I moved RCUR by 5 cm rather that 0.5 cm. Another physop mistake. Next shot: reload RCUR from shot 13 and move it out 0.5 cm, this time correctly.
Jun 15 2005 01:29:29:767PM	1050615015	Robert Granetz	No-power shot cycle. There's a problem with the shot cycle.
Jun 15 2005 01:59:21:780PM	1050615016	Robert Granetz	Dud. Br0 is a little low. Pre-fill pressure also dropped a bit. Next shot: raise Br0 offset back to today's starting value and increase pre-fill pulse another 2 ms (to 27 ms). NINJA will puff D2 at t=1.2 s.
Jun 15 2005 02:11:23:670PM	1050615017	Robert Granetz	Dud. Everything looks pretty good. Next shot: add -15 A to IC_EF4 (to -1295 A)
Jun 15 2005 02:28:55:247PM	1050615018	Robert Granetz	Plasma. Good shot. Remained limited on inboard wall and outboard gap varied between 3 mm and 0 mm. Kapp=1.6. Startup remains lousy. Next shot: repeat; no DPCS changes.
Jun 15 2005 02:39:43:793PM	1050615019	Robert Granetz	Plasma. Good shot. Similar to previous one. Next shot: reduce kappa to 1.2-1.3 by decreasing CLEARIN to -4 cm. Keep RCUR the same, so the outer gap remains close to zero. LPI will move to t=1.6 s (was at 1.75 s).
Jun 15 2005 02:58:28:310PM	1050615020	Robert Granetz	Plasma. Disrupted at t=1.38 s. Inboard limited, although the outer gap gets down to zero just before the disruption. Kappa=1.34. Next shot: reduce CLEARIN to -4.7 cm and move RCUR in later in the shot. Also, get rid of the Btor ramp...set Btor to 5.4 T (flat)
Jun 15 2005 03:11:01:337PM	1050615021	Robert Granetz	Plasma. Disrupted very early due to impurity injections. Lots of glowing particlulates can be seen on the JANT video view (frame 7, t=0.211 s) Next shot: repeat, no changes.
Jun 15 2005 03:27:21:157PM	1050615022	Robert Granetz	Plasma. Good shot. Elongation=1.28 until t=1.2 s, then it increases a little. Outboard gap=2-3 mm. Next shot: reduce elongation a little more by lowering CLEARIN to -5.0 cm.
Jun 15 2005 03:42:20:997PM	1050615023	Robert Granetz	Plasma. Good shot. Elongation=1.26 until t=1.2 s, then increases. So I didn't make enough of a change to CLEARIN. Also, the outer gap goes to zero late in the flattop. Next shot: reduce CLEARIN some more (even more later in the shot), and move RCUR in a little late in the shot.
Jun 15 2005 03:57:21:583PM	1050615024	Robert Granetz	Plasma. Disrupted at t=0.50 s due to impurity injection, but I couldn't find it on any of the video views. Elongation at t=0.5 s is 1.20, which is what we want for the entire flattop. Next shot: repeat, no changes.
Jun 15 2005 04:17:01:543PM	1050615025	Robert Granetz	Plasma. Good shot. Elongation=1.21 for most of the flattop. Just touched the outer limiter late in the flattop. Next shot: lower Bt to 4.6 T and reduce the elongation further (CLEARIN) and move RCUR a little again, late in the shot.
Jun 15 2005 04:28:12:447PM	1050615026	Robert Granetz	Fizzle. Next shot: reduce pre-fill by 2 ms, lower Br0 offset by 0.1 mT.
Jun 15 2005 04:47:01:517PM	1050615027	Robert Granetz	Plasma. Disrupted at t=0.73 s, again due to an injection. Kappa=1.17. Next shot: load a 1 MA fiducial, but reduce Ip to 0.8 MA, Bt to 4.6 T, and make the outer gap small.
Jun 15 2005 04:58:19:480PM	1050615028	Robert Granetz	Plasma. Good 1 MA, 5.4 T, SNL fiducial, but I didn't want that. Next shot: 0.8 MA, 4.6 T, small outer gap.
Jun 15 2005 05:18:30:780PM	1050615029	Robert Granetz	Plasma. Good shot. Disrupted at t=1.40 s due to an impurity injection. 0.8 MA, 4.6 T, SNL. Outer gap = 10 -> 9 -> 8 mm. nl_04=1.0e20 m-2. End of run.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:13:11:737AM	Plasma	Ok
2	09:26:34:473AM	Plasma	Ok
3	09:45:34:493AM	Plasma	Ok
4	10:01:38:440AM	Plasma	Ok
5	10:34:30:857AM	Plasma	Ok
6	10:47:02:270AM	Plasma	Ok	ack fail
7	11:00:18:883AM	Plasma	Ok
8	11:20:53:260AM	Plasma	Ok
9	11:34:30:660AM	Plasma	Ok
10	11:47:48:113AM	Plasma	Ok
11	12:01:00:327PM	Plasma	Ok
12	12:23:59:457PM	Plasma	Ok
13	12:36:57:150PM	Plasma	Ok
14	12:49:32:157PM	Plasma	Ok
15	01:21:38:010PM	Plasma	Bad	no power, data system hang
16	01:48:07:037PM	Plasma	Ok
17	02:01:31:090PM	Plasma	Ok
18	02:14:11:513PM	Plasma	Ok
19	02:29:33:000PM	Plasma	Ok
20	02:42:01:857PM	Plasma	Ok
21	03:00:55:527PM	Plasma	Ok
22	03:16:26:630PM	Plasma	Ok
23	03:30:54:407PM	Plasma	Ok
24	03:45:37:447PM	Plasma	Bad	OH2 and OH1 com fault
25	04:07:23:843PM	Plasma	Ok
26	04:20:30:293PM	Plasma	Ok
27	04:36:12:880PM	Plasma	Ok
28	04:51:34:060PM	Plasma	Ok
29	05:06:09:883PM	Plasma	Ok