Alcator C-Mod Run 1070411 Information

Miniproposals

Miniproposal: 473

Date Filed: 3/9/2007

Title: Lower Hybrid System Check-out and Initial operation

First Author: J. Randall Wilson

Session Leader: Andrea Schmidt (shots 1-26)

Operators
Session leader(s):	Andrea Schmidt
Physics operator(s):	Joseph Snipes
Engineering operator(s):	Andy Pfeiffer,Ed Fitzgerald,Gary Dekow

Engineering Operator Run Comment
MP 473: Lower Hybrid Checkout Session leaders: A. Schmidt and G. Wallace

Session Leader Plans

Entered: Apr 10 2007 04:05:33:327PM

Author: Andrea Schmidt

Morning run plan
SL: Schmidt
MP: 473

Shot plan:
1) Try to duplicate results from shot 1060728011 (same current, same density, same LH parameters)
2) Try to duplicate results from shot 1060728014 (same current, same density, same LH parameters)
purpose: lower the density to try to see hxr signal levels similar to last campaign
3) Start ne scan with long LH pulses, 60 deg phasing, ~500 kW. Scan peak densities 1e20, 1.25e20, 1.5e20 (if we have time, 1.75e20, 2e20, and 0.75e20)

Entered: Apr 10 2007 04:12:41:783PM

Author: Greg Wallace

This will be a half day run in the afternoon following Andrea. The plan is to investigate the effect of using NINJA to modify the edge density in front of the LH grill. We hope to find that puffing D2 gas from the A/B limiter will locally increase density in front of the top rows of the LH antenna (the two are magnetically connected), thus decreasing reflection coef for low density shots.

NINJA firing D2 gas at 1 second, LH at .7 seconds. Starting shot will be 1070330007.

NINJA will start with 12psi. We will increase the pressure by 5psi per shot until we see a increase in density and/or decrease in reflection coef. (4 shots)

At this point, move the plasma away from the outer wall by 10mm( 4 shots), then 20mm (4 shots) and repeat NINJA pressure scan.

Physics Operators Plans

Entered: Apr 10 2007 04:00:53:577PM

Author: Joseph Snipes

Engineering setup for Wednesday 11 April 2007

MP 473: Lower Hybrid Checkout

Session leaders: A. Schmidt and G. Wallace
Physics operator: J. A. Snipes

Overnight ECDC in Deuterium.

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

Power systems as on 1070330007

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 as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
pumpout and fill NINJA with 12 psi D2 Hybrid disabled

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

Torvac setup: Gate valves open

Key diagnostics: Hard x ray array

-------------------------------------------------------------------------------
ICRF Setup: No ICRF

--------------------------------------------------------------------------------
LH Setup: LH required at moderate power ~ 1 MW
------------------------------------------------------------------------------
Run plan: First load from shot 1070330007 except reduce Ip to 0.6 MW and go to as low
a density as possible perhaps nl04 ~ 3 x 10^19 m^-2. We will be trying
to reproduce shots 1060728011 and 014 at 0.6 MA and 1 MA at low density
but we will use the setup from this year's shot to avoid DPCS problems.
Then increase the density in steps up to perhaps nl04 ~ 8 x 10^19 m^-2
looking for changes in LH coupling and hard x ray profiles.
For the later part of the run, we will sit at nl04 = 8 x 10^19 m^-2
and vary the NINJA gas puff to look for effects on LH coupling.

Session Leader Summaries

Entered: Apr 11 2007 05:05:06:097PM

Author: Andrea Schmidt

Summary:

We started the day trying to reproduce conditions from the 2006 campaign (so far this campaign, there has been little/no HXR signal during LH). We established high HXR signal, high ECE nonthermal signal, and significant loop voltage drops in shots 1-3 and 5 (shot 4 was at higher density and showed no fast electron evidence). At this point, we had seen clear evidence of fast electrons and current drive at nl04=4e19 and NO evidence of fast electrons at nl04=8e19. Moving in steps of 1e19, we raised the density from nl04=4e19 to nl04=7.5e19 during shots 8-10 to see where the density threshold was. Fast electrons were detectable at nl04=6e19, but not nl04=7.5e19.

Thinking this might be an accessibility issue, we raised the field from 5.4 T to 7 T and lowered density back to 6e19. Then we slowly raised density in increments of 1e19, successfully up to nl04=1e20, where fast electron evidence disappeared (shots 12-16).

Thinking that we were again hitting an accessibility limit, we changed from 60 degree phasing to 90 degree phasing and 120 degree phasing. We found evidence of fast electrons at nl04=1e20 for both of the higher phasings (shots 17-20).

For shots 21+, we brought the density back down to nl04=8e19, brought the phasing back to 60 degrees, and raised the current from 800 kA to 1.2 MA (there is some evidence that higher total current is correlated with higher LHCD efficiency). This resulted in a number of LH trips, followed by disruptions and fizzles. It appears that the LH trips were due to extremely low density at the grill due to the increased current. We attempted to get the LH coupling back by puffing gas with the ninja system, with no success. The gas puffing brought up the core density as much as it brought up the edge density (we were hoping to bring up the edge density preferentially).

Physics Operator Summaries

Entered: Apr 11 2007 05:12:18:257PM

Author: Joseph Snipes

It was a good run with some interesting results on the Lower Hybrid operation for a number of plasma conditions.
Density was scanned over a fairly broad range. The TF was varied from 4.3 T to 7 T and the plasma current was
varied from 0.5 MA to 1.2 MA. The high field discharges were set to rampdown the TF at 1.2 s, but all of the
shape parameters were not adjusted in time accordingly and this may have contributed to the disruptions in the
rampdown for the high current discharges. This programming was corrected for the last two discharges 25 and 26
but they were both fizzles, so it was not possible to test them. I recommend to the next physop to start with
shot 25 to run a 1.2 MA, 7T shot in the future and it should go. The startup was not varied hardly at all
throughout the day and was quite reliable until we got disruptions. There were some runaways in the startup
and they were eliminated by a PG3 gas tweak in the breakdown phase on shot 17. There were some TF fuses blown
when we went to high TF, but they were quickly replaced. Otherwise, the machine ran very well today. Of 26
shots, there were 22 full length plasmas, 4 fizzles following disruptions, no duds, and no system faults.

Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result
| 01 1.994 0.626 Plasma | 02 1.997 0.624 Plasma |
| 03 1.999 0.627 Plasma | 04 1.991 0.826 Plasma |
| 05 1.994 0.837 Plasma | 06 1.994 0.833 Plasma |
| 07 1.994 0.830 Plasma | 08 1.995 0.834 Plasma |
| 09 1.996 0.822 Plasma | 10 1.996 0.826 Plasma |
| 11 1.981 0.817 Plasma | 12 1.998 0.839 Plasma |
| 13 1.995 0.829 Plasma | 14 2.000 0.833 Plasma |
| 15 1.997 0.838 Plasma | 16 1.996 0.830 Plasma |
| 17 1.998 0.832 Plasma | 18 1.993 0.831 Plasma |
| 19 1.997 0.831 Plasma | 20 1.995 0.828 Plasma |
| 21 1.664 1.209 Plasma | 22 0.000 0.046 Fizzle |
| 23 1.324 1.209 Plasma | 24 0.000 0.050 Fizzle |
| 25 0.000 0.046 Fizzle | 26 0.000 0.043 Fizzle |

Date 1070411: 26 shots. 22 plasmas. 4 fizzles. 0 duds. 0 System Error.
(Plasma = Ip gt 51.0 kA Dud = H_alpha lt 0.40 V)
Total plasma duration: 42.89 s (exceeding -62 kA)

Session Leader Comments

Apr 11 2007 11:03:30:207AM 1070411005 Andrea Schmidt Lowered density to 4e19. Will lower further to 3e19 on next shot to increase current drive efficiency.

Apr 11 2007 11:01:46:783AM 1070411006 Andrea Schmidt Lowered density to 3e19 --> LH coupling went away. Will try gas puffing on next shot.

Apr 11 2007 11:01:05:457AM 1070411007 Andrea Schmidt Puffed gas to get density higher near grill. Density shot up, still no LH coupling. Will raise density to 4e19 nl04 for next shot.

Apr 11 2007 10:59:33:283AM 1070411008 Andrea Schmidt Still no LH coupling. Next shot will raise density to 6e19 nl04.

Apr 11 2007 11:13:11:180AM 1070411009 Andrea Schmidt Raised density to 6e19. LH coupling came back. Loop voltage dropped, ECE nonthermal signal strong. HXR has no baseline drift, but appears to increase during LH (post-processing needed). Will raise density to 7e19 for next shot.

Apr 11 2007 11:42:37:470AM 1070411010 Andrea Schmidt Raised density to 7e19 nl04. LH coupling still fine. Lost most visible nonthermal ECE, loop voltage change, and probably hxr too (post-processing needed). Next shot will be back at 6e19 nl04, at 4.3 T field, for an ECE calibration.

Apr 11 2007 11:51:32:583AM 1070411011 Andrea Schmidt Lowered density to 6e19 nl04. Lowered field to 4.3 T for an ECE calibration. Next shot will be at high field (7 T).

Apr 11 2007 12:55:24:640PM 1070411012 Andrea Schmidt Raised field to 7 T. LH tripped a little early. Will redo this shot for 13.

Apr 11 2007 01:10:31:583PM 1070411013 Andrea Schmidt Same as shot 12 to get full LH pulse. Next shot will be same but with higher density (7e19 nl04).

Apr 11 2007 01:42:40:860PM 1070411014 Andrea Schmidt Raised density (7e19 nl04). Nonthermal ECE and HXR still present. Very little loop voltage response. Will raise density to 8e19 nl04 on next shot.

Apr 11 2007 02:23:31:017PM 1070411015 Andrea Schmidt Density did not get raised in this shot. Same results as shot 14. Next shot will raise density.

Apr 11 2007 02:33:07:017PM 1070411016 Andrea Schmidt Density raised to 1e20 nl04 (9e19 requested). No more ECE. Will try same shot, 90 degree approx phasing next shot.

Apr 11 2007 02:34:13:717PM 1070411017 Andrea Schmidt Phasing changed to 90 degree approximate. ECE nonthermal signal still apparent.

Apr 11 2007 02:34:59:530PM 1070411017 Andrea Schmidt Phasing changed to 90 degree approximate. ECE nonthermal signal still apparent. Next shot will be same (hopefully density will be more constant during the shot and LH won't trip).

Apr 11 2007 02:44:37:980PM 1070411018 Andrea Schmidt Same as shot 17. ECE present (but low), no loop voltage change. Next shot will change LH phasing to 120 approx, everything else the same.

Apr 11 2007 03:02:49:190PM 1070411019 Andrea Schmidt Changed to 120 approx phasing. LH tripped and density not very constant. Will repeat for shot 20.

Apr 11 2007 03:25:59:920PM 1070411020 Andrea Schmidt 120 approx phasing. Some ECE (very small), no loop voltage change. Next shot will be 1.2 MA, phasing changed back to 60 degrees, requested density back down to 7e19 nl04.

Apr 11 2007 03:49:01:037PM 1070411021 Andrea Schmidt 1.2 MA, phasing changed back to 60 degrees, requested density back down to 7e19 nl04. Disrupted at ~1.65 s, LH tripped out continually (edge density very low). Next shot will be same with gas puffing at 0.8 s.

Apr 11 2007 04:43:15:213PM 1070411022 Andrea Schmidt Fizzle. Same parameters next shot.

Apr 11 2007 04:43:43:433PM 1070411023 Andrea Schmidt Lh trips and disruption again. Same parameters next shot

Apr 11 2007 05:07:10:490PM 1070411024 Andrea Schmidt fizzle. Same parameters next shot.

Apr 11 2007 05:15:50:977PM 1070411025 Andrea Schmidt fizzle. Same parameters next shot.

Apr 11 2007 05:15:18:790PM 1070411026 Andrea Schmidt fizzle.

Physics Operator Comments

Apr 11 2007 08:37:05:557AM 1070411001 Joseph Snipes Shot 1: Loaded shot 1070330007 and then changed Ip to 0.5 MA and nl04 to 3 x 10^19 m^-2. This should nearly
repeat the desired shot 1060728011 without having to change all of the DPCS settings for the old shot.

Apr 11 2007 09:10:56:617AM 1070411001 Joseph Snipes Shot 1: Good shot. Got a brief LH pulse from 0.7 to 0.72 s. Highly non-thermal ECE on GPC8. GPC1 is dead
for some reason. Got the desired density. Lots of runaways after 0.7 s.

Apr 11 2007 09:26:50:373AM 1070411002 Joseph Snipes Shot 2: Good shot. Got a brief LH pulse from 0.72 to 0.8 s up to 300 kW. Highly non-thermal ECE on GPC8.
GPC1 is still dead for some reason.

Apr 11 2007 09:35:06:547AM 1070411003 Joseph Snipes Shot 3: Good shot. Runaways starting early. Flash visible in the video image on the LH grill at 1.2 s.
LH pulse from 0.7 to 1.2 s at 700 kW.

Apr 11 2007 09:48:45:473AM 1070411004 Joseph Snipes Shot 4: Loaded shot 1070330007 with Ip = 0.8 MA and nl04 = 8 x 10^19 m^-2. Good shot.

Apr 11 2007 10:05:45:403AM 1070411005 Joseph Snipes Shot 5: Enabled DNB gatevalve. DNB should be on from 0.4 to 1.4 s. Lowered nl04 to 4 x 10^19 m^-2. Good shot.

Apr 11 2007 10:27:21:630AM 1070411006 Joseph Snipes Shot 6: Lowered nl04 to 3 x 10^19 m^-2. Good shot.

Apr 11 2007 10:36:04:477AM 1070411007 Joseph Snipes Shot 7: NINJA puff at 1.0 s to change LH coupling. Good shot. Density increases to nl04 = 6 x 10^19 m^-2
after the NINJA puff.

Apr 11 2007 10:49:17:060AM 1070411008 Joseph Snipes Shot 8: Increased nl04 to 4 x 10^19 m^-2. NINJA turned off. Good shot.

Apr 11 2007 11:03:14:237AM 1070411009 Joseph Snipes Shot 9: Increased nl04 to 6 x 10^19 m^-2. Good shot.

Apr 11 2007 11:27:39:123AM 1070411010 Joseph Snipes Shot 10: Increased nl04 to 7 x 10^19 m^-2. Got an Ohmic ELMy H-mode from 1.2 to 1.49 s. It appears that the LH
induced the H-mode, but it remained in H-mode long after the LH turned off. Good shot.

Apr 11 2007 12:04:30:010PM 1070411011 Joseph Snipes Shot 11: Lowered TF current to 119 kA to go to 4.3 T after t=0.
Ohmic H-mode from 1.39 to 1.57 s. Good shot.

Apr 11 2007 12:49:20:857PM 1070411012 Joseph Snipes Shot 12: Raised TF current to 194 kA to go to 7 T from 0 to 1.2 s. Good shot but LH tripped early.
Short delay to replace two fuses on the TF.

Apr 11 2007 12:54:35:983PM 1070411013 Joseph Snipes Shot 13: Repeat. Good shot.

Apr 11 2007 01:19:27:057PM 1070411014 Joseph Snipes Shot 14: Raised nl04 to 7 x 10^19 m^-2. Good shot.

Apr 11 2007 01:51:31:613PM 1070411015 Joseph Snipes Shot 15: Raised nl04 to 8 x 10^19 m^-2. Good shot. Still have early runaways.
Forgot to load the density change into the model so the density programming
remained at 7 x 10^19 m^-2.

Apr 11 2007 02:07:18:730PM 1070411016 Joseph Snipes Shot 16: Increased prepuff by 3 ms to 27 ms duration. Raised nl04 to 8 x 10^19 m^-2. Still got early
runaways. Startup looks a bit worse also. Othwerwise a good shot.

Apr 11 2007 02:30:17:613PM 1070411017 Joseph Snipes Shot 17: Increased PG3 gas in segment 1 from 0.014 s to 0.03 s to attempt to get rid of the early runaways.
That got rid of the early runaways. Good shot.

Apr 11 2007 02:43:28:013PM 1070411018 Joseph Snipes Shot 18: Repeat. Good shot.

Apr 11 2007 03:04:14:330PM 1070411019 Joseph Snipes Shot 19: Repeat. Good shot.

Apr 11 2007 03:18:28:837PM 1070411020 Joseph Snipes Shot 20: Repeat. Good shot.

Apr 11 2007 03:57:42:523PM 1070411021 Joseph Snipes Shot 21: Raised Ip to 1.2 MA and reduced nl04 to 7 x 10^19 m^-2. Disrupted in the rampdown at 1.66 s
around 0.8 MA. EF2U coil stress > 50% of allowable apparently because the
Ip ramp rate is too large on the rampup. Otherwise, it is a good shot.

Apr 11 2007 04:04:58:980PM 1070411022 Joseph Snipes Shot 22: Reduced Ip ramp up rate so that it is programmed to reach 0.9 MA at 0.4 s and 1.2 MA at 0.6 s.
Started Ip rampdown at 1.2 s to match the TF rampdown. NINJA puff at 0.8 s. Fizzle!

Apr 11 2007 04:33:28:413PM 1070411024 Joseph Snipes Shot 23: Try again. Disrupted in rampdown at 1.32 s at 1 MA.

Apr 11 2007 04:34:08:117PM 1070411024 Joseph Snipes Shot 24: Fizzle!

Apr 11 2007 04:47:32:043PM 1070411025 Joseph Snipes Shot 25: Changed the parameters in All Ps in segment 2 to ramp down at 1.2 s with Ip and BT so that the shape
ramps down with the field and current. LPI to fire a Li pellet at 1.3 s. Fizzle!

Apr 11 2007 04:49:16:967PM 1070411025 Joseph Snipes Shot 26: Try again.

Apr 11 2007 04:59:18:190PM 1070411026 Joseph Snipes Shot 26: Try again. Fizzle. Didn't wait long enough.

Engineering Operator Comments

Shot Time Type Status Comment

1 08:59:10:783AM Plasma Ok

2 09:16:35:103AM Plasma Ok

3 09:29:28:450AM Plasma Ok

4 09:46:19:567AM Plasma Ok

5 10:03:51:573AM Plasma Ok

6 10:19:29:910AM Plasma Ok

7 10:33:19:257AM Plasma Ok

8 10:46:40:077AM Plasma Ok

9 11:01:32:270AM Plasma Ok

10 11:16:25:913AM Plasma Ok

11 11:40:19:457AM Plasma Ok

12 12:06:09:497PM Plasma Ok

13 12:52:43:950PM Plasma Ok

14 01:12:43:490PM Plasma Ok

15 01:44:26:347PM Plasma Ok

16 02:02:32:713PM Plasma Ok

17 02:21:00:703PM Plasma Ok

18 02:39:38:153PM Plasma Ok

19 02:59:00:470PM Test Bad

20 03:16:35:993PM Test Bad

21 03:35:21:593PM Plasma Ok

22 04:03:14:950PM Plasma Ok

23 04:15:30:983PM Plasma Ok

24 04:32:40:803PM Plasma Ok

25 04:44:54:167PM Plasma Ok

26 04:57:16:483PM Plasma Ok

System Availability

Apr 11 2007 08:58:45:737AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD yes Fully operational Mar 28 2007 09:19PM (sears) Joe Snipes Active MHD Antenna sears,snipes
BES yes vertical array of six views at R ~ 87.3 cm, radial array of three views out to R ~ 89 cm, both at outboard midplane. Three discrete fiber views of beam at R ~ 70.0, 76.5 and 82.5 cm. Feb 06 2007 10:00AM (bravenec) Ron Bravenec Beam Emission Spectroscopy bravenec
Bolometers no 2Pi diode operational, 2Pi foil has 180 Hz noise source. Preparing external amplifiers and DAQ. Midplane ready soon, 2D ready by start of science runs. Mar 27 2007 05:30PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization no Jan 14 2007 01:47PM Jim Irby Boronization dekow,irby
CNPA no Jan 14 2007 02:06PM Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor no In-vessel hardware is installed; in-vessel cryogenic systems are leak-tight and have passed LN2 cool-down tests. Work is proceeding on external LHe and LN2 transfer lines as well as PLC control system. Mar 30 2007 10:53AM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard
CXRS yes The pedestal toroidal array was installed, spatially and absolutely calibrated. There are 10 chords intersects the beam at the range major_R=[75,4:87.4]cm. Spatial resolution: 1.2 cm. The F-top poloidal array was installed and spatially calibrated. There are 19 chords intersects the beam at the range major_R=[67.8:91.0]cm. Spacial resolution: 1.22 cm. Apr 04 2007 01:39PM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,rachmcd,rowan
D Alpha yes \ha2_bright and \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 are available Mar 11 2007 10:28PM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes camera is re-installed, and view has been calibrated Feb 26 2007 03:28PM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation no Jan 14 2007 02:02PM Bob Granetz Gas Jet granetz,whyte
Divertor IR no Mar 06 2007 10:50AM Glen Wurden Divertor IR Digital Video gwurden,terry
Divertor IR Spectroscopy no Mar 06 2007 10:51AM Glen Wurden Divertor IR Spectroscopy gwurden,ldorf,terry
DNB yes All systems are operational, but as of 28 March 2007, the beam needs additional conditioning for full performance shots Mar 28 2007 09:36AM (beals) Bob Granetz Diagnostic Beam beals,granetz
FRC-ECE yes All channels now working. Apr 04 2007 11:04AM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes The gauge is operational. Mar 30 2007 10:54AM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
GPC yes Chs 1-8 operational, cross-calibrated. Apr 04 2007 02:08PM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Most slow channels (except 1,8,10,17) operational. Apr 03 2007 03:54PM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI yes New view just outside of the lower X-point is operational, but data is being archived locally , not to the tree. Midplane GPI is not operational. Mar 27 2007 01:59PM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes spectral calibration needs to be checked, but system should be ready for the run Feb 26 2007 03:28PM (marmar) Earl Marmar H/D Ratio marmar
Hirex III no Jan 14 2007 01:53PM John Rice High Resolution X-Ray ince,rice
Hirex Jr yes Mar 06 2007 08:59AM (rice) John Rice High Resolution X-Ray ince,rice
HXR yes Something might be wrong with channel 26; all others working fine. Mar 23 2007 10:43AM (schmidt) Ron Parker Hard X-Ray Array parker,schmidt
ICRF D-Antenna yes 80.5 MHz. ready Mar 28 2007 08:50AM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna no 80 MHz. FFT installation/coaxial line needs more work Mar 16 2007 09:32AM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes 78 MHz Apr 04 2007 08:56AM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Lower Hybrid yes System ready for tests into plasma Apr 10 2007 08:43AM (dterry) Ron Parker Lower Hybrid dterry,parker
LPI no available by 4/2 Mar 27 2007 04:44PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha no Preparing external amplifiers and DAQ. Midplane ready soon, 2D ready by start of science runs. Mar 27 2007 05:30PM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes still a problem with the post shot script; this is being fixed by hand at present Mar 29 2007 11:45AM (terry) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Operational. Mar 28 2007 08:33AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes E-Top, E-Bottom, F-top (cryo), G-side, and B-bottom are operational. F-top gauge has a 'sniffer tube' to measure pressures in cryopump gas box. Mar 20 2007 06:42PM (g) Brian LaBombard Baratron pressure gauges labombard
MLP no Bench tests are proceeding on a prototype MLP system. We hope to roll the system into the cell for testing in a few weeks, powering up a single electrode on the A-port scanning probe. Mar 13 2007 09:57PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE no (1) Bandpass filters replacement underway (2) Beam-into-gas spectrum measurement underway (3) Shutter mechanism currently unstable; remains open. (4) Expect beam-into-gas calibrations complete about 4/24. Apr 03 2007 12:05PM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Both neutron systems are fully operational Apr 05 2007 11:19AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes operational Mar 21 2007 04:29PM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby
NINJA yes All capillaries displayed by the NINJA_CONTROL GUI have been tested. NINJA puffed on 1070329009 (A-B limiter). Mar 29 2007 11:47AM (terry) Brian LaBombard NINJA gas puff labombard,terry
PCI no System unavailable. The laser is under repair. Apr 04 2007 11:16PM (lianglin) Miklos Porkolab Phase Contrast Imaging edlund,lianglin,ntsujii,porkolab
Penning Gauges yes 8 in-situ Penning ionization gauges appear to be operational: CB_DivU, CB_OutL, CB_DivL, KA_OutU, KA_OutL, B_DivL, Cryo_1, Cryo_2. Cryo_1 and Cryo_2 are new and installed in the upper cryopump 'gas-box'. Mar 13 2007 10:01PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV (without an ND filter) are operational. Mar 27 2007 01:53PM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter no Retro shutter closed Mar 15 2007 11:00AM (irby) Jim Irby C-Mod Polarimeter irby
Probe Array - ISD yes Probes at 15 of the 16 poloidal locations ('ramped' geometry) are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:47PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes All 6 probes on the lower hybrid launcher (tungsten, 1.5 mm projection) are operational. Mar 13 2007 09:46PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Probes at 10 poloidal locations (one 'ramped' and one 'flush') are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:45PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes 14 probes are operational ('ramped' geometry). n,Te, particle flux reported every 10 ms.Two high-gain channels are installed and operational for ECDC plasma diagnosis. Mar 13 2007 12:46PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes The 60, 75 and 88GHz (no sidebands) channels are connected and being tested. The rest are disconnected Apr 10 2007 10:32PM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Perpendicular Mach probe head is installed. The drive is operational. Mar 15 2007 09:09PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Perpendicular Mach probe head is installed. The probe drive is now operational. Mar 13 2007 09:51PM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP no A-port WASP successfully collected data on 04/04. Working on final plunge calibration. Some intermittent open circuit on SE Electrode. No data yet taken with K-WASP. Apr 05 2007 10:19AM (nsmick) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
TCI yes NL04 at 71.04 cm from 3/9/07 calibration Mar 09 2007 05:47PM (irby) Jim Irby Two-Color Interferometer (TCI) irby,murray
TS - Core yes 2 lasers, 8 polychromators + 3 old (and less accurate) spectrometers. Density is not calibrated yet. Temperatures from polychromators should be reliable. Apr 11 2007 12:24AM (jwhughes) Jerry Hughes Thomson Scattering - Core jwhughes
TS - Edge no Expected operational after Apr. 13, following recalibration of new spectral channel Apr 11 2007 12:22AM (jwhughes) Jerry Hughes Thomson Scattering - Edge jwhughes
Vispec no Apr 06 2007 08:51AM (agraf) Alex Graf Visible Spectrometer agraf

Apr 11 2007 09:46:02:880AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD yes Fully operational Mar 28 2007 09:19PM (sears) Joe Snipes Active MHD Antenna sears,snipes
BES yes vertical array of six views at R ~ 87.3 cm, radial array of three views out to R ~ 89 cm, both at outboard midplane. Three discrete fiber views of beam at R ~ 70.0, 76.5 and 82.5 cm. Feb 06 2007 10:00AM (bravenec) Ron Bravenec Beam Emission Spectroscopy bravenec
Bolometers no 2Pi diode operational, 2Pi foil has 180 Hz noise source. Preparing external amplifiers and DAQ. Midplane ready soon, 2D ready by start of science runs. Mar 27 2007 05:30PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization no Jan 14 2007 01:47PM Jim Irby Boronization dekow,irby
CNPA no Jan 14 2007 02:06PM Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor no In-vessel hardware is installed; in-vessel cryogenic systems are leak-tight and have passed LN2 cool-down tests. Work is proceeding on external LHe and LN2 transfer lines as well as PLC control system. Mar 30 2007 10:53AM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard
CXRS yes The pedestal toroidal array was installed, spatially and absolutely calibrated. There are 10 chords intersects the beam at the range major_R=[75,4:87.4]cm. Spatial resolution: 1.2 cm. The F-top poloidal array was installed and spatially calibrated. There are 19 chords intersects the beam at the range major_R=[67.8:91.0]cm. Spacial resolution: 1.22 cm. Apr 04 2007 01:39PM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,rachmcd,rowan
D Alpha yes \ha2_bright and \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 are available Mar 11 2007 10:28PM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes camera is re-installed, and view has been calibrated Feb 26 2007 03:28PM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation no Jan 14 2007 02:02PM Bob Granetz Gas Jet granetz,whyte
Divertor IR no Mar 06 2007 10:50AM Glen Wurden Divertor IR Digital Video gwurden,terry
Divertor IR Spectroscopy no Mar 06 2007 10:51AM Glen Wurden Divertor IR Spectroscopy gwurden,ldorf,terry
DNB yes All systems are operational, but as of 28 March 2007, the beam needs additional conditioning for full performance shots Mar 28 2007 09:36AM (beals) Bob Granetz Diagnostic Beam beals,granetz
FRC-ECE yes All channels now working. Apr 04 2007 11:04AM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes The gauge is operational. Mar 30 2007 10:54AM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
GPC yes Chs 2-8 operational, cross-calibrated. Apr 11 2007 09:34AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Most slow channels (except 1,8,10,17) operational. Set to lower freqs for LHCD. Apr 11 2007 09:34AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI yes New view just outside of the lower X-point is operational, but data is being archived locally , not to the tree. Midplane GPI is not operational. Mar 27 2007 01:59PM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes spectral calibration needs to be checked, but system should be ready for the run Feb 26 2007 03:28PM (marmar) Earl Marmar H/D Ratio marmar
Hirex III no Jan 14 2007 01:53PM John Rice High Resolution X-Ray ince,rice
Hirex Jr yes Mar 06 2007 08:59AM (rice) John Rice High Resolution X-Ray ince,rice
HXR yes Something might be wrong with channel 26; all others working fine. Mar 23 2007 10:43AM (schmidt) Ron Parker Hard X-Ray Array parker,schmidt
ICRF D-Antenna yes 80.5 MHz. ready Mar 28 2007 08:50AM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna no 80 MHz. FFT installation/coaxial line needs more work Mar 16 2007 09:32AM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes 78 MHz Apr 04 2007 08:56AM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Lower Hybrid yes System ready for tests into plasma Apr 10 2007 08:43AM (dterry) Ron Parker Lower Hybrid dterry,parker
LPI no available by 4/2 Mar 27 2007 04:44PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha no Preparing external amplifiers and DAQ. Midplane ready soon, 2D ready by start of science runs. Mar 27 2007 05:30PM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes still a problem with the post shot script; this is being fixed by hand at present Mar 29 2007 11:45AM (terry) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Operational. Mar 28 2007 08:33AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes E-Top, E-Bottom, F-top (cryo), G-side, and B-bottom are operational. F-top gauge has a 'sniffer tube' to measure pressures in cryopump gas box. Mar 20 2007 06:42PM (g) Brian LaBombard Baratron pressure gauges labombard
MLP no Bench tests are proceeding on a prototype MLP system. We hope to roll the system into the cell for testing in a few weeks, powering up a single electrode on the A-port scanning probe. Mar 13 2007 09:57PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE no (1) Bandpass filters replacement underway (2) Beam-into-gas spectrum measurement underway (3) Shutter mechanism currently unstable; remains open. (4) Expect beam-into-gas calibrations complete about 4/24. Apr 03 2007 12:05PM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Both neutron systems are fully operational Apr 05 2007 11:19AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes operational Mar 21 2007 04:29PM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby
NINJA yes All capillaries displayed by the NINJA_CONTROL GUI have been tested. NINJA puffed on 1070329009 (A-B limiter). Mar 29 2007 11:47AM (terry) Brian LaBombard NINJA gas puff labombard,terry
PCI no System unavailable. The laser is under repair. Apr 04 2007 11:16PM (lianglin) Miklos Porkolab Phase Contrast Imaging edlund,lianglin,ntsujii,porkolab
Penning Gauges yes 8 in-situ Penning ionization gauges appear to be operational: CB_DivU, CB_OutL, CB_DivL, KA_OutU, KA_OutL, B_DivL, Cryo_1, Cryo_2. Cryo_1 and Cryo_2 are new and installed in the upper cryopump 'gas-box'. Mar 13 2007 10:01PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV (without an ND filter) are operational. Mar 27 2007 01:53PM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter no Retro shutter closed Mar 15 2007 11:00AM (irby) Jim Irby C-Mod Polarimeter irby
Probe Array - ISD yes Probes at 15 of the 16 poloidal locations ('ramped' geometry) are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:47PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes All 6 probes on the lower hybrid launcher (tungsten, 1.5 mm projection) are operational. Mar 13 2007 09:46PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Probes at 10 poloidal locations (one 'ramped' and one 'flush') are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:45PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes 14 probes are operational ('ramped' geometry). n,Te, particle flux reported every 10 ms.Two high-gain channels are installed and operational for ECDC plasma diagnosis. Mar 13 2007 12:46PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes The 60, 75 and 88GHz (no sidebands) channels are connected and being tested. The rest are disconnected Apr 10 2007 10:32PM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Perpendicular Mach probe head is installed. The drive is operational. Mar 15 2007 09:09PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Perpendicular Mach probe head is installed. The probe drive is now operational. Mar 13 2007 09:51PM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP no A-port WASP successfully collected data on 04/04. Working on final plunge calibration. Some intermittent open circuit on SE Electrode. No data yet taken with K-WASP. Apr 05 2007 10:19AM (nsmick) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
TCI yes NL04 at 71.04 cm from 3/9/07 calibration Mar 09 2007 05:47PM (irby) Jim Irby Two-Color Interferometer (TCI) irby,murray
TS - Core yes 2 lasers, 8 polychromators + 3 old (and less accurate) spectrometers. Density is not calibrated yet. Temperatures from polychromators should be reliable. Apr 11 2007 12:24AM (jwhughes) Jerry Hughes Thomson Scattering - Core jwhughes
TS - Edge no Expected operational after Apr. 13, following recalibration of new spectral channel Apr 11 2007 12:22AM (jwhughes) Jerry Hughes Thomson Scattering - Edge jwhughes
Vispec no Apr 06 2007 08:51AM (agraf) Alex Graf Visible Spectrometer agraf

Session Leader Comments
Apr 11 2007 11:03:30:207AM	1070411005	Andrea Schmidt	Lowered density to 4e19. Will lower further to 3e19 on next shot to increase current drive efficiency.
Apr 11 2007 11:01:46:783AM	1070411006	Andrea Schmidt	Lowered density to 3e19 --> LH coupling went away. Will try gas puffing on next shot.
Apr 11 2007 11:01:05:457AM	1070411007	Andrea Schmidt	Puffed gas to get density higher near grill. Density shot up, still no LH coupling. Will raise density to 4e19 nl04 for next shot.
Apr 11 2007 10:59:33:283AM	1070411008	Andrea Schmidt	Still no LH coupling. Next shot will raise density to 6e19 nl04.
Apr 11 2007 11:13:11:180AM	1070411009	Andrea Schmidt	Raised density to 6e19. LH coupling came back. Loop voltage dropped, ECE nonthermal signal strong. HXR has no baseline drift, but appears to increase during LH (post-processing needed). Will raise density to 7e19 for next shot.
Apr 11 2007 11:42:37:470AM	1070411010	Andrea Schmidt	Raised density to 7e19 nl04. LH coupling still fine. Lost most visible nonthermal ECE, loop voltage change, and probably hxr too (post-processing needed). Next shot will be back at 6e19 nl04, at 4.3 T field, for an ECE calibration.
Apr 11 2007 11:51:32:583AM	1070411011	Andrea Schmidt	Lowered density to 6e19 nl04. Lowered field to 4.3 T for an ECE calibration. Next shot will be at high field (7 T).
Apr 11 2007 12:55:24:640PM	1070411012	Andrea Schmidt	Raised field to 7 T. LH tripped a little early. Will redo this shot for 13.
Apr 11 2007 01:10:31:583PM	1070411013	Andrea Schmidt	Same as shot 12 to get full LH pulse. Next shot will be same but with higher density (7e19 nl04).
Apr 11 2007 01:42:40:860PM	1070411014	Andrea Schmidt	Raised density (7e19 nl04). Nonthermal ECE and HXR still present. Very little loop voltage response. Will raise density to 8e19 nl04 on next shot.
Apr 11 2007 02:23:31:017PM	1070411015	Andrea Schmidt	Density did not get raised in this shot. Same results as shot 14. Next shot will raise density.
Apr 11 2007 02:33:07:017PM	1070411016	Andrea Schmidt	Density raised to 1e20 nl04 (9e19 requested). No more ECE. Will try same shot, 90 degree approx phasing next shot.
Apr 11 2007 02:34:13:717PM	1070411017	Andrea Schmidt	Phasing changed to 90 degree approximate. ECE nonthermal signal still apparent.
Apr 11 2007 02:34:59:530PM	1070411017	Andrea Schmidt	Phasing changed to 90 degree approximate. ECE nonthermal signal still apparent. Next shot will be same (hopefully density will be more constant during the shot and LH won't trip).
Apr 11 2007 02:44:37:980PM	1070411018	Andrea Schmidt	Same as shot 17. ECE present (but low), no loop voltage change. Next shot will change LH phasing to 120 approx, everything else the same.
Apr 11 2007 03:02:49:190PM	1070411019	Andrea Schmidt	Changed to 120 approx phasing. LH tripped and density not very constant. Will repeat for shot 20.
Apr 11 2007 03:25:59:920PM	1070411020	Andrea Schmidt	120 approx phasing. Some ECE (very small), no loop voltage change. Next shot will be 1.2 MA, phasing changed back to 60 degrees, requested density back down to 7e19 nl04.
Apr 11 2007 03:49:01:037PM	1070411021	Andrea Schmidt	1.2 MA, phasing changed back to 60 degrees, requested density back down to 7e19 nl04. Disrupted at ~1.65 s, LH tripped out continually (edge density very low). Next shot will be same with gas puffing at 0.8 s.
Apr 11 2007 04:43:15:213PM	1070411022	Andrea Schmidt	Fizzle. Same parameters next shot.
Apr 11 2007 04:43:43:433PM	1070411023	Andrea Schmidt	Lh trips and disruption again. Same parameters next shot
Apr 11 2007 05:07:10:490PM	1070411024	Andrea Schmidt	fizzle. Same parameters next shot.
Apr 11 2007 05:15:50:977PM	1070411025	Andrea Schmidt	fizzle. Same parameters next shot.
Apr 11 2007 05:15:18:790PM	1070411026	Andrea Schmidt	fizzle.

Physics Operator Comments
Apr 11 2007 08:37:05:557AM	1070411001	Joseph Snipes	Shot 1: Loaded shot 1070330007 and then changed Ip to 0.5 MA and nl04 to 3 x 10^19 m^-2. This should nearly repeat the desired shot 1060728011 without having to change all of the DPCS settings for the old shot.
Apr 11 2007 09:10:56:617AM	1070411001	Joseph Snipes	Shot 1: Good shot. Got a brief LH pulse from 0.7 to 0.72 s. Highly non-thermal ECE on GPC8. GPC1 is dead for some reason. Got the desired density. Lots of runaways after 0.7 s.
Apr 11 2007 09:26:50:373AM	1070411002	Joseph Snipes	Shot 2: Good shot. Got a brief LH pulse from 0.72 to 0.8 s up to 300 kW. Highly non-thermal ECE on GPC8. GPC1 is still dead for some reason.
Apr 11 2007 09:35:06:547AM	1070411003	Joseph Snipes	Shot 3: Good shot. Runaways starting early. Flash visible in the video image on the LH grill at 1.2 s. LH pulse from 0.7 to 1.2 s at 700 kW.
Apr 11 2007 09:48:45:473AM	1070411004	Joseph Snipes	Shot 4: Loaded shot 1070330007 with Ip = 0.8 MA and nl04 = 8 x 10^19 m^-2. Good shot.
Apr 11 2007 10:05:45:403AM	1070411005	Joseph Snipes	Shot 5: Enabled DNB gatevalve. DNB should be on from 0.4 to 1.4 s. Lowered nl04 to 4 x 10^19 m^-2. Good shot.
Apr 11 2007 10:27:21:630AM	1070411006	Joseph Snipes	Shot 6: Lowered nl04 to 3 x 10^19 m^-2. Good shot.
Apr 11 2007 10:36:04:477AM	1070411007	Joseph Snipes	Shot 7: NINJA puff at 1.0 s to change LH coupling. Good shot. Density increases to nl04 = 6 x 10^19 m^-2 after the NINJA puff.
Apr 11 2007 10:49:17:060AM	1070411008	Joseph Snipes	Shot 8: Increased nl04 to 4 x 10^19 m^-2. NINJA turned off. Good shot.
Apr 11 2007 11:03:14:237AM	1070411009	Joseph Snipes	Shot 9: Increased nl04 to 6 x 10^19 m^-2. Good shot.
Apr 11 2007 11:27:39:123AM	1070411010	Joseph Snipes	Shot 10: Increased nl04 to 7 x 10^19 m^-2. Got an Ohmic ELMy H-mode from 1.2 to 1.49 s. It appears that the LH induced the H-mode, but it remained in H-mode long after the LH turned off. Good shot.
Apr 11 2007 12:04:30:010PM	1070411011	Joseph Snipes	Shot 11: Lowered TF current to 119 kA to go to 4.3 T after t=0. Ohmic H-mode from 1.39 to 1.57 s. Good shot.
Apr 11 2007 12:49:20:857PM	1070411012	Joseph Snipes	Shot 12: Raised TF current to 194 kA to go to 7 T from 0 to 1.2 s. Good shot but LH tripped early. Short delay to replace two fuses on the TF.
Apr 11 2007 12:54:35:983PM	1070411013	Joseph Snipes	Shot 13: Repeat. Good shot.
Apr 11 2007 01:19:27:057PM	1070411014	Joseph Snipes	Shot 14: Raised nl04 to 7 x 10^19 m^-2. Good shot.
Apr 11 2007 01:51:31:613PM	1070411015	Joseph Snipes	Shot 15: Raised nl04 to 8 x 10^19 m^-2. Good shot. Still have early runaways. Forgot to load the density change into the model so the density programming remained at 7 x 10^19 m^-2.
Apr 11 2007 02:07:18:730PM	1070411016	Joseph Snipes	Shot 16: Increased prepuff by 3 ms to 27 ms duration. Raised nl04 to 8 x 10^19 m^-2. Still got early runaways. Startup looks a bit worse also. Othwerwise a good shot.
Apr 11 2007 02:30:17:613PM	1070411017	Joseph Snipes	Shot 17: Increased PG3 gas in segment 1 from 0.014 s to 0.03 s to attempt to get rid of the early runaways. That got rid of the early runaways. Good shot.
Apr 11 2007 02:43:28:013PM	1070411018	Joseph Snipes	Shot 18: Repeat. Good shot.
Apr 11 2007 03:04:14:330PM	1070411019	Joseph Snipes	Shot 19: Repeat. Good shot.
Apr 11 2007 03:18:28:837PM	1070411020	Joseph Snipes	Shot 20: Repeat. Good shot.
Apr 11 2007 03:57:42:523PM	1070411021	Joseph Snipes	Shot 21: Raised Ip to 1.2 MA and reduced nl04 to 7 x 10^19 m^-2. Disrupted in the rampdown at 1.66 s around 0.8 MA. EF2U coil stress > 50% of allowable apparently because the Ip ramp rate is too large on the rampup. Otherwise, it is a good shot.
Apr 11 2007 04:04:58:980PM	1070411022	Joseph Snipes	Shot 22: Reduced Ip ramp up rate so that it is programmed to reach 0.9 MA at 0.4 s and 1.2 MA at 0.6 s. Started Ip rampdown at 1.2 s to match the TF rampdown. NINJA puff at 0.8 s. Fizzle!
Apr 11 2007 04:33:28:413PM	1070411024	Joseph Snipes	Shot 23: Try again. Disrupted in rampdown at 1.32 s at 1 MA.
Apr 11 2007 04:34:08:117PM	1070411024	Joseph Snipes	Shot 24: Fizzle!
Apr 11 2007 04:47:32:043PM	1070411025	Joseph Snipes	Shot 25: Changed the parameters in All Ps in segment 2 to ramp down at 1.2 s with Ip and BT so that the shape ramps down with the field and current. LPI to fire a Li pellet at 1.3 s. Fizzle!
Apr 11 2007 04:49:16:967PM	1070411025	Joseph Snipes	Shot 26: Try again.
Apr 11 2007 04:59:18:190PM	1070411026	Joseph Snipes	Shot 26: Try again. Fizzle. Didn't wait long enough.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:59:10:783AM	Plasma	Ok
2	09:16:35:103AM	Plasma	Ok
3	09:29:28:450AM	Plasma	Ok
4	09:46:19:567AM	Plasma	Ok
5	10:03:51:573AM	Plasma	Ok
6	10:19:29:910AM	Plasma	Ok
7	10:33:19:257AM	Plasma	Ok
8	10:46:40:077AM	Plasma	Ok
9	11:01:32:270AM	Plasma	Ok
10	11:16:25:913AM	Plasma	Ok
11	11:40:19:457AM	Plasma	Ok
12	12:06:09:497PM	Plasma	Ok
13	12:52:43:950PM	Plasma	Ok
14	01:12:43:490PM	Plasma	Ok
15	01:44:26:347PM	Plasma	Ok
16	02:02:32:713PM	Plasma	Ok
17	02:21:00:703PM	Plasma	Ok
18	02:39:38:153PM	Plasma	Ok
19	02:59:00:470PM	Test	Bad
20	03:16:35:993PM	Test	Bad
21	03:35:21:593PM	Plasma	Ok
22	04:03:14:950PM	Plasma	Ok
23	04:15:30:983PM	Plasma	Ok
24	04:32:40:803PM	Plasma	Ok
25	04:44:54:167PM	Plasma	Ok
26	04:57:16:483PM	Plasma	Ok