Alcator C-Mod Run 1080109 Information

Miniproposals

Miniproposal: 518

Date Filed: 11/30/2007

Title: LH_B and LH_D NINJA Capillary Testing

First Author: Greg Wallace

Session Leader: Greg Wallace (shots 1-30)

Operators
Session leader(s):	Greg Wallace
Physics operator(s):	Joseph Snipes
Engineering operator(s):	Andy Pfeiffer,Ed Fitzgerald,Bill Parkin

Engineering Operator Run Comment
Session Leader: G. Wallace Physics Operator: J. Snipes MP518 LH_B and LH

Session Leader Plans

Entered: Jan 9 2008 08:33:49:213AM

Author: Greg Wallace

Session Leader Plan for 1080109

Session Leader: G. Wallace
Physics Operator: J. Snipes

MP518 LH_B and LH_D NINJA Capillary Testing

This will be a full day run to continue testing the new LH NINJA
capillaries. Since we already confirmed on 1071219 that the system can operate
at up to 700kW without arcing we will now move on to see if gas injection can
help with coupling over long distances between the grill and the seperatrix.

Plasma Setup:
Overnight ECDC. Cryopump on all shots. Start with 1071219032.

LH Setup:
90 degree current drive phasing, 1.5mm behind limiter, start at 40kV beam voltage and 85kW per klystron, firing
from .7 to 1.3 seconds.

Shot Plan:
1) Start at 90kW per klystron. NINJA off and outer gap constant at 1.5cm during
LH pulse for the first shot to get a baseline for the coupling. Repeat shot
with different control gains if density varies by more than +/-10%.

2) Repeat shot 1 with ~5psi NINJA puff on B and D side with puff triggering
from 0.55s to 1.25s.

2a) Repeat shot 1 with ~5psi NINJA puff on B and D side but LH turned off.

3) Increase outer gap to 2.5cm with NINJA and LH on.

4) If waves are able to couple at 2.5cm, increase outer gap to 3.5cm with NINJA
and LH on.

5) If waves are able to couple at 3.5cm outer gap, increase outer gap to a
maximum of 4.5cm during LH pulse with NINJA and LH on.

6-9) Repeat shots 2-5 with ~10psi NINJA puff on B and D side.

10) Sweep outer gap from 1.5cm at .7s to 4.5cm at 1.3s. Keep NINJA off.

11) Repeat shot 10 with ~5psi NINJA puff on B and D side with puff triggering from
0.55s to 1.25s.

12) Repeat shot 10 with ~10psi NINJA puff on B and D side with puff triggering
from 0.55s to 1.25s.

13) Cell access to move launcher to 5mm behind limiter. Repeat shot 1 to get a baseline at this grill location.

14-21) Repeat shots 2-9 with launcher at 5mm behind limiter.

If time allows: Increase power to maximum available.

Physics Operators Plans

Entered: Jan 8 2008 03:00:45:400PM

Author: Joseph Snipes

Physop Run Plan for Wednesday, 9 January 2008; 1080109

MP518 LH_B and LH_D NINJA Capillary Testing

Session Leader: G. Wallace
Physics Operator: J. A. Snipes

-----------------
Engineering Setup
-----------------

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

Power systems as on: 1071219032 upper single null, 5.4 T, 0.8 MA

Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid 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)
fill NINJA with 5 psi D2 Disabled

Enable gatevalves and shutters: ECE, VUV, DNB, Z-bolo

Overnight ECDC in deuterium and 60 C bake
------------------------------
ECDC Parameters
------------------------------
gas and pressure: D2 at 2e-4 Torr
sweep: 44/45/103 cm
scan: 20/120 s

ICRF: not required
LH: required with 90 degree current drive phasing
DNB: not required but may operate
Cryopump: on and cold for the first shot
Vessel temperature: 35/35/35

Session Leader Summaries

Entered: Jan 11 2008 03:57:51:937PM

Author: Greg Wallace

Session Leader Summary for 1080109

MP518: LH_B and LH_D NINJA Capillary Testing
Session Leader: G. Wallace
Physics Operator: J. Snipes

This was the second day of operation for MP518. The first run day, 1071219,
was cut short due to the so-called "Wallace Phenomenon," better known as the
afternoon fizzles. Initial results from 1071219 showed that the
combination of a gas puff from the LH NINJA capillaries and LH power levels in
excess of 500kW produced higher density at the LH grill for the same line
integrated density in lower null, however the LH coupling did not improve as
dramatically as we would have hoped. Unfortunately we were unable to keep
core densities as low as we wished in lower null, hence the move to upper null
with cryopump to control the density during puffing.
Overall, the machine performed well in the afternoon with only 3 fizzles, 2
early disruptions, and 1 no power shot. Not bad for an LH run.

Given the low densities (nl_04=3.5-4e19m^-2) we were flirting with the locked
mode threshold for much of the day and needed to repeat several shots due to
locked modes. An interesting phenomenon was observed during these locked
modes in shots 6, 8, and 11. Despite very low line integrated density and
upwards of 0.5MW of LH power, there were no signs of current drive on the loop
voltage. HXR and ECE diagnostics still show significant signs of fast
electrons during these shots, however. Sudden spikes followed by slow decays
in the non-thermal ECE signal (similar to inverted sawteeth but not of the
correct frequency) during the LH are seen as well.

The coupling experiments at the core of this run had some very surprising
results. The first surprising result was that the LH system was able to
couple into low density (nl_04=3.5-4e19m^-2) upper null plasmas with outer
gaps of up to 3.5cm and a grill position of 1.5mm behind the LH limiter. This
was totally unexpected due to the experience from the 2007 campaign that
showed a need for outer gaps of 0.5cm or less to obtain good coupling in low
density plasmas. Edge densities of 4-5e17m^-3 as measured by the LH Langmuir
probes are consistent with the observed reflection coefficients. NINJA
puffing under these conditions did little to effect the edge density or the LH
wave coupling, which was already reasonable (20-30% reflected power).

The second result came as we moved the LH launcher further behind its limiter.
After getting great coupling with large outer gaps at a 1.5mm distance from
the launcher to the limiter, we moved the launcher back to 5mm. As expected,
coupling without the NINJA at this position was poor (80-100% reflected
power). As we increased the NINJA puff to 10psi and decreased the outer gap
to 0.5cm, we found that coupling improved only slightly, despite increasing
the density measured by the LH probes around twice the cutoff density of
2.6e17m^-3. Why exactly this is happening is unclear however this indicates
that there may be a change in the density gradient which is causing the higher
reflections.

Due to lack of time, we were unable to manually move the launcher to an
intermediate position of 3.5mm behind the limiter. This run clearly showed
the importance of the future upgrade to a remote launcher position system.

As a follow on to the results of this run, we will be conducting experiments
on long distance LH coupling into ICRF heated upper null L-mode plasmas on
1080115. It is hoped that the large outer gap plasmas developed on this day
will allow us to avoid the glowing seen on the LH antenna during ICRF
operation with grill to limiter distances in the range 1.5-2.5mm.

Physics Operator Summaries

Entered: Jan 9 2008 05:16:13:330PM

Author: Joseph Snipes

There were a few problems today that cost some run time, but overall the machine ran pretty well. There were a few disruptions in flattop first with LHCD and then a couple late in the day early in the pulse before LHCD turned on. There were also a number of fizzles, sometimes due to the preceding disruption, but other times because the cryopump warmed up just before INIT so that the neutral pressure at breakdown was too high. Bill Parkin also noticed after shot 21 that one of the TF converters was not working properly and had not been working properly since last Friday. So, we had an hour delay to replace six fuses on the TF. Still, the main physics program of the run was achieved. See the session leader summary for the physics details. There were 30 shots, 26 plasmas, 3 fizzles, and one TF test shot. Of the plasma shots, there were three that disrupted before the LHCD pulse and one during the LHCD pulse. The startup was ugly for almost all shots today despite multiple changes in prepuff duration, Br0, EF4, and even RCUR offset. However, the startup was surprisingly robust to these changes except when the cryopump was too warm and led to very high neutral pressure at breakdown or there was a preceding disruption that led to high carbon level.

Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result
| 01 0.794 0.831 Plasma | 02 1.971 0.825 Plasma |
| 03 1.972 0.824 Plasma | 04 1.971 0.817 Plasma |
| 05 1.971 0.822 Plasma | 06 1.969 0.815 Plasma |
| 07 1.973 0.823 Plasma | 08 1.967 0.813 Plasma |
| 09 1.971 0.816 Plasma | 10 1.971 0.820 Plasma |
| 11 1.968 0.815 Plasma | 12 1.972 0.820 Plasma |
| 13 1.972 0.822 Plasma | 14 1.680 0.817 Plasma |
| 15 0.000 0.054 Fizzle | 16 1.971 0.817 Plasma |
| 17 1.971 0.820 Plasma | 18 1.969 0.809 Plasma |
| 19 1.794 0.811 Plasma | 20 1.970 0.814 Plasma |
| 21 0.411 0.798 Plasma | 22 0.000 0.003 Dud |
| 23 0.000 0.038 Fizzle | 24 0.315 0.789 Plasma |
| 25 1.970 0.813 Plasma | 26 0.412 0.786 Plasma |
| 27 0.000 0.048 Fizzle | 28 1.970 0.815 Plasma |
| 29 1.970 0.814 Plasma | 30 1.970 0.814 Plasma |

Date 1080109: 30 shots. 26 plasmas. 3 fizzles. 1 test shot.
(Plasma = Ip gt 60.0 kA Dud = H_alpha lt 0.40 V)
Total plasma duration: 44.82 s (exceeding -83 kA)

Session Leader Comments

Jan 9 2008 09:23:32:977AM 1080109001 Greg Wallace Disruption at .787 due to an injection from the LH grill. Will retry on next shot.

Interesting spike in the nonthermal ECE right as LH is about to trip out.

Jan 9 2008 09:31:19:410AM 1080109002 Greg Wallace Good shot! Lots of nonthermal ECE, good .4V reduction in Vloop, lots of hard xrays. Coupling pretty noisy around 25-30% with edge density around 4-5e17 on mid and bottom probes. Density data from top probe looks missing/unreliable. nl_04 3.2-3.5e19.

Next shot will repeat with NINJA on at a 5psi puff from .55s to 1.25s.

Jan 9 2008 09:48:26:153AM 1080109003 Greg Wallace One trip at 1.155s due to a small vacuum breakdown on the D row near column 20.

Otherwise the shot looked good and retried successfully. Density increase not obvious on the LH probes. Next shot will repeat without LH on to get a baseline with gas puff and no power.

Jan 9 2008 09:55:32:340AM 1080109004 Greg Wallace Line averaged density looked same as for shot 3 but the edge density on the LH probes was higher by a factor of 2 with the LH turned off? Next shot will increase outer gap to 2.5cm and turn LH back on.

Jan 9 2008 10:10:33:443AM 1080109005 Greg Wallace LH ran clean at larger outer gap with the NINJA on. Next shot will repeat but with NINJA off.

Coupling around 25% reflected power with edge density around 3-5e17 on mid and 2-4e17 on bottom. Top probe still doesn't look reliable. nl_04 slightly higher around 4.2-4.4e19.

Jan 9 2008 10:25:12:967AM 1080109006 Greg Wallace Very interesting shot. Looks like we went into a locked mode which possibly killed any signs of current drive. We see a "sawtooth" nonthermal ECE signal and the loop voltage stays completely flat.

Despite the NINJA being off, lots of edge density. nl_04=3.7e19 and the mid probes at 1e18 and bottom probes at .6-1e18. LH coupling at 30% reflected power.

Will repeat while trying to eliminate the locked mode.

Jan 9 2008 10:39:14:383AM 1080109007 Greg Wallace No locked mode, lots of current drive. Coupling was quite good (25% reflected power) despite no NINJA puff. nl_04 dropping from 4.3 to 3.8e19. Grill density around 3-4e17.

Next shot will keep NINJA on but turn off the LH power.

Jan 9 2008 11:00:11:703AM 1080109008 Greg Wallace nl_04 stayed steady around 3.9 to 4.2e19 with LH off and NINJA on. LH probes measured around 1e18 with no LH power.

Steve Wolfe reports a locked mode during this shot so that may be the source of the high edge density.

Next shot will repeat (NINJA on, LH off) trying to eliminate the locked mode.

Jan 9 2008 11:07:42:497AM 1080109009 Greg Wallace No locked mode on this shot but density was a bit higher ~4-4.5e19 on nl_04. Probe density a bit lower around 8e17 but still pretty high for this large outer gap with no LH power.

Next shot will move to 3.5cm outer gap with LH and NINJA on.

Jan 9 2008 11:22:26:180AM 1080109010 Greg Wallace Cryo "burped" and was not working correctly on this shot. Will retry on the next shot with the cryo on to keep the density down.

Coupling did not look great at beginning of shot but improved by .8s as the line averaged density rose to nearly 5.4e19.

Jan 9 2008 11:41:02:233AM 1080109011 Greg Wallace Another locked mode, again with no current drive. LH ran clean with so-so coupling. More "sawtooth" activity on the non-thermal ECE.

Will try again to see if we can make the locked mode go away.

Jan 9 2008 11:50:21:827AM 1080109012 Greg Wallace No locked mode. Good signs of current drive with density factor of 2 lower than previous shot at the LH probes (~4e17). Coupling improved during shot as density increased from 4.5 to 5e19 on nl_04. Next shot will disable NINJA and keep LH on.

Jan 9 2008 12:10:46:067PM 1080109013 Greg Wallace No NINJA on this shot with the LH turned on. Coupling was pretty good towards the end of the shot although the line averaged density decreased from .7 to 1.1s. Next shot will turn on NINJA and turn off LH.

Jan 9 2008 12:21:09:783PM 1080109014 Greg Wallace Locked mode at .5s according to Steve Wolfe. This shot had NINJA but no LH. Will retry to eliminate the locked mode.

nl_04 between 3.8 and 4.2e19, mid and bottom probes between .5 and 1e18.

Jan 9 2008 12:32:56:683PM 1080109015 Greg Wallace Fizzle.

Jan 9 2008 12:40:32:697PM 1080109016 Greg Wallace Shot ran well without locked mode. nl_04 steady around 4.8e19 and LH probes 4-5e17.

Next shot will be cryo off, NINJA off, LH on.

Jan 9 2008 01:23:31:167PM 1080109017 Greg Wallace Shot ran well with no cryo and no NINJA. LH coupling pretty good despite falling line integrated density. nl_04 falling from 4.5 to 4e19 and LH probes between 3 and 4e17.

Cell access to move launcher to 5mm behind the LH limiter. Hopefully this will cause coupling to get worse without the NINJA???

Next shot will be a repeat of shot 1 with the grill moved farther back.

Jan 9 2008 01:46:25:297PM 1080109018 Greg Wallace No feedback on the density control. Will repeat with TCI fixed.

LH could not couple without the NINJA on. Density is around 1-5e16 on the LH probes.

Jan 9 2008 01:58:46:370PM 1080109019 Greg Wallace Another locked mode. Will repeat one more time to get a baseline before turning on NINJA.

Jan 9 2008 02:09:17:680PM 1080109020 Greg Wallace This shot worked as requested. LH could not couple with the low edge density (<1e17 on LH probes) and nl_04 was steady around 4-4.2e19.

Scopes show LH launcher at 5.5mm behind the grill.

Next shot will turn on NINJA and keep LH on.

Jan 9 2008 02:20:28:133PM 1080109021 Greg Wallace Disruption at .4s. Will repeat.

Jan 9 2008 03:35:03:540PM 1080109022 Greg Wallace Test shot.

Jan 9 2008 03:35:09:370PM 1080109023 Greg Wallace Fizzle

Jan 9 2008 03:50:32:817PM 1080109024 Greg Wallace Disruption at 0.31s.

Jan 9 2008 04:06:21:890PM 1080109025 Greg Wallace LH was not able to couple with the NINJA on. No appreciable increase in density measured at the LH grill despite seeing the ionization on the LH camera. Density at the grill is 1.5-2e16 on top, 5-8e16 on mid, and .6-1.2e17 on bottom.

Next shot will increase puff to 10psi from 5psi.

Jan 9 2008 04:09:18:043PM 1080109026 Greg Wallace Another early disruption.

Jan 9 2008 04:25:11:647PM 1080109027 Greg Wallace Fizzle.

Jan 9 2008 04:44:57:513PM 1080109028 Greg Wallace Still no coupling during early part of pulse when LH was restriking. After restrikes ended density at the grill continued to rise. Next shot will move NINJA puff earlier.

NINJA puff will trigger at .35s on the next shot.

Jan 9 2008 04:58:38:213PM 1080109029 Greg Wallace Still no coupling although the grill density is where it was this morning where we had good coupling (3-4e17). Next shot will decrease outer gap to 0.5cm.

Jan 9 2008 05:53:40:207PM 1080109030 Greg Wallace Many trips mostly due to big spikes in reflection, maybe from breakdown in the region in front of the grill. Nothing on the LH camera looks like breakdown in a guide but there are bright lines across the grill along the field lines.

This is the only shot at 5mm behind the limiter where there was any coupling at all. Between trips the coupling was not good (~50% reflected power) although the density at the grill was ~5-6e17. This is actually greater than the density at which we had good coupling than with the 3.5cm outer gap (~4e17 for shot 17).

Physics Operator Comments

Jan 9 2008 09:14:14:853AM 1080109001 Joseph Snipes Shot 1: Loaded shot 1071219032 and then reloaded segment 1 from shot 1080108022, which has prepuff ending at -0.4 s with a 35 ms long pulse for cryopump operation.
Note that the live segment is segment 3 for an upper null 0.8 MA, 5.4 T discharge.
nl04 is programmed to 3.5 x 10^19 m^-2. NINJA is off for the first shot. Disrupted at 0.79 s during the LHCD. There are bright flashes on the LH grill just before the disruption indicating a plasma surface interaction with the grill that probably caused the disruption. The startup does not look very good either.

Jan 9 2008 09:27:30:100AM 1080109002 Joseph Snipes Shot 2: Repeat. Good shot.

Jan 9 2008 09:39:53:000AM 1080109003 Joseph Snipes Shot 3: Repeat with NINJA puffing deuterium from 0.55 - 1.25 s. Runaways early.
Startup does not look good. Otherwise it was a good shot.

Jan 9 2008 09:50:45:277AM 1080109004 Joseph Snipes Shot 4: Increased prepuff by 5 ms to 40 ms duration. Repeat without LHCD to see the effect of the NINJA puff. Good shot.

Jan 9 2008 10:03:35:477AM 1080109005 Joseph Snipes Shot 5: Reduced Br0 by 0.5 mT to -0.0005 T. Reduced RCUR by 0.5 cm to increase the outer gap by 1 cm. LHCD turned back on. Good shot.

Jan 9 2008 10:16:54:330AM 1080109006 Joseph Snipes Shot 6: Reduced EF4 current from -1340 to -1325 A to raise Bz more positive at breakdown. Good shot. Breakdown has improved.

Jan 9 2008 10:33:50:323AM 1080109007 Joseph Snipes Shot 7: Repeat. Breakdown is worse but the shot is good.

Jan 9 2008 11:43:09:657AM 1080109008 Joseph Snipes Shot 8: Increased prepuff by 3 ms to 43 ms duration. Turned off LHCD. Good shot. Turned on argon puff at 50 ms duration. Startup is still bad.

Jan 9 2008 11:04:09:970AM 1080109009 Joseph Snipes Shot 9: Try reducing the prepuff to 35 ms duration. Redo this shot to try to get it without the locked mode. Good shot. Startup is still bad.

Jan 9 2008 11:20:52:807AM 1080109010 Joseph Snipes Shot 10: Increased EF4 current from -1325 to -1345 A. Decreased RCUR by 5 mm to get a 3.5 cm outer gap. Good shot. Startup is no better. Cryopump warmed up just before the shot so it was not pumping during the shot and the prepuff pressure was very high.

Jan 9 2008 11:28:49:850AM 1080109011 Joseph Snipes Shot 11: Repeat with the cryopump cold. Good shot. Startup still looks bad.

Jan 9 2008 11:44:31:920AM 1080109012 Joseph Snipes Shot 12: Increased RCUR offset in segment 1 from 1000 to 1500 to try to improve the startup. Increased Argon puff by 50 ms to 100 ms duration. Good shot. Startup still looks bad.

Jan 9 2008 11:59:34:307AM 1080109013 Joseph Snipes Shot 13: Increased EF4 current by 10 A to -1355 A to reduce Bz at breakdown. Good shot.

Jan 9 2008 12:12:43:443PM 1080109014 Joseph Snipes Shot 14: Increased prepuff by 4 ms to 39 ms duration. Startup is still not looking very good. Disrupted in rampdown at about 1.67 s.

Jan 9 2008 12:26:54:000PM 1080109015 Joseph Snipes Shot 15: Decreased prepuff to 33 ms duration. Cryopump warmed up just before the shot so the pressure was too high. Fizzle!

Jan 9 2008 12:38:27:400PM 1080109016 Joseph Snipes Shot 16: Repeat with cryopump cold. Good shot.

Jan 9 2008 12:53:07:490PM 1080109017 Joseph Snipes Shot 17: Turned cryopump off. Reduced prepuff to 17 ms duration. Good shot.

Jan 9 2008 12:53:48:083PM 1080109017 Joseph Snipes Cell access to move the LH launcher back from -1.5 to -5 mm behind the LH limiter.

Jan 9 2008 01:41:42:330PM 1080109018 Joseph Snipes Shot 18: Cryopump back on. Increased prepuff to 38 ms duration taking into account an extra 5 ms because the DNB will be opening for the next shot and it pumps on the machine. Increased RCUR by 1 cm to reduce the outer gap to 1.5 cm. Good shot. TCI failed to provide density feedback but the density remained low.

Jan 9 2008 01:56:45:950PM 1080109019 Joseph Snipes Shot 19: Repeat with density feedback. Good shot. Locked mode leading to disruptions in the rampdown ending at 1.79 s.

Jan 9 2008 02:11:56:583PM 1080109020 Joseph Snipes Shot 20: Repeat without locked mode. Cryopump was warming up just before the shot but the shot went nonetheless amazingly. Indeed, the breakdown looks good at this high pressure 0.098 mTorr. Good shot.

Jan 9 2008 02:21:27:177PM 1080109021 Joseph Snipes Shot 21: Increased prepuff to 44 ms duration. NINJA puff on. Disrupted at 0.405 s.

Jan 9 2008 02:39:37:290PM 1080109021 Joseph Snipes It seems 6 fuses have been blown on the TF since last Friday and Bill Parkin just noticed that one of the TF converters is not working properly. So, we are stopping to replace the fuses. It will mean about an hour delay at least.

Jan 9 2008 03:29:29:920PM 1080109022 Joseph Snipes Shot 22: Test shot for TF. OK.

Jan 9 2008 03:31:19:590PM 1080109023 Joseph Snipes Shot 23: Increased prepuff to 50 ms duration. Fizzle!

Jan 9 2008 04:29:25:240PM 1080109024 Joseph Snipes Shot 24: Decreased prepuff to 45 ms duration. Increased EF4 current by 10 A to -1360 A. Disrupted at 0.31 s.

Jan 9 2008 04:29:36:333PM 1080109025 Joseph Snipes Shot 25: Br0 changed by -2 mT on shot 23. Add 1 mT to make Br0 = +0.5 mT. Good shot. Startup looks good finally.

Jan 9 2008 04:30:04:147PM 1080109026 Joseph Snipes Shot 26: Raised NINJA pressure to 10 psi. LH has difficulty operating at -5 mm behind the limiter. Perhaps, more pressure will help. Disrupted at 0.41 s.

Jan 9 2008 04:32:00:050PM 1080109027 Joseph Snipes Shot 27: Repeat without the disruption. Cryopump was apparently too warm as the neutral pressure was rather high around 0.09 mTorr. Fizzle!

Jan 9 2008 04:37:20:893PM 1080109028 Joseph Snipes Shot 28: Repeat with plasma and without the disruption and with the cryopump cold. Good shot.

Jan 9 2008 04:47:58:560PM 1080109029 Joseph Snipes Shot 29: NINJA puff start time changed to 0.35 s so that the puff should enter the plasma around 0.5 s. Increased prepuff by 4 ms to 49 ms duration. Reduced Br0 offset to 0. Good shot.

Jan 9 2008 05:02:03:070PM 1080109030 Joseph Snipes Shot 30: Increased RCUR by 4 mm to decrease the outer gap to about 0.5 cm. Decreased abs(EF4) current by 15 A to -1350 A. Good shot.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:09:20:577AM Plasma Ok

2 09:22:05:460AM Plasma Ok

3 09:36:23:660AM Plasma Ok

4 09:49:00:467AM Plasma Ok

5 10:01:50:680AM Plasma Ok

6 10:14:42:347AM Plasma Ok

7 10:27:15:310AM Plasma Ok

8 10:39:50:197AM Plasma Ok

9 11:01:51:720AM Plasma Ok

10 11:14:20:370AM Plasma Ok

11 11:26:38:303AM Plasma Ok

12 11:41:56:860AM Plasma Ok

13 11:57:06:713AM Plasma Ok

14 12:09:38:257PM Plasma Ok

15 12:22:45:940PM Plasma Ok

16 12:35:12:637PM Plasma Ok

17 12:47:38:647PM Plasma Ok

18 01:37:52:130PM Plasma Ok

19 01:51:16:810PM Plasma Ok

20 02:03:44:477PM Plasma Ok

21 02:16:56:583PM Plasma Ok

22 03:17:15:953PM Test Ok 100KA TF test PLC control

23 03:29:37:123PM Plasma Ok

24 03:42:16:587PM Plasma Ok

25 03:55:03:160PM Plasma Ok

26 04:07:25:797PM Plasma Ok PF breaker pulled after plasma disrupted

27 04:20:19:790PM Plasma Ok

28 04:32:57:753PM Plasma Ok

29 04:46:19:577PM Plasma Ok

30 04:59:36:040PM Plasma Ok

System Availability

Jan 9 2008 09:08:57:543AM

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 yes Diode 2pi working fine, foil 2pi being low-pass filtered to remove noise. Outboard miidplane AXUV fine. Midplane foils working fine, but need to fill tree with calibrations. 2D AXUV arrays are being digitized but need further debugging and calibration. Dec 19 2007 07:16PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization no First Boronization 5/9/07 Bottle has been removed from the cell Sep 14 2007 12:42PM (dekow) Jim Irby Boronization dekow,irby
CNPA yes Single channel CNPA available as of 12/1707 Dec 17 2007 05:48PM (parker) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor yes Cryopump is operational Dec 11 2007 10:13AM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard
CXRS yes The pedestal toroidal array was installed, spatially and absolutely calibrated. There are 10 chords intersect the beam at the major_R_range=[74.2:86.3]cm. Spatial resolution: 1.2 cm. The F-top poloidal array was installed and spatially calibrated. There are 19 chords intersect the beam at the major_R_range=[67.8:91.0]cm. Spatial resolution: 1.22 cm. Nov 27 2007 10:21AM (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 Nov 26 2007 04:23PM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes optics repaired, camera re-installed, and view has been re-calibrated Nov 27 2007 09:54AM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation no Nov 20 2007 10:47PM (granetz) Robert 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,terry
DNB no Nov 20 2007 10:47PM (granetz) Robert Granetz Diagnostic Neutral Beam beals,granetz
FRC-ECE yes Chs 17-32 working - low freq. mixer being repaired Nov 26 2007 11:41AM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes Gauge is operational and calibrated against G-side MKS on shot#1071127002 Nov 27 2007 01:25PM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
GPC yes All 9 channels operational as of new year. Jan 03 2008 09:31AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Most channels operational. Jan 02 2008 12:22PM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI no Neither the Xpt-view nor the midplane-view camera is operational. Nov 26 2007 04:25PM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes Should be operational for the FY08 campaign Nov 27 2007 09:54AM (marmar) Earl Marmar H/D Ratio marmar
Hirex Jr yes Mar 06 2007 08:59AM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr no Be Window has a leak and so the gate valve is closed Nov 23 2007 12:50PM (ince) 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 available (quarter-wave transformer for pre-matching) Dec 11 2007 09:01AM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes available (with FFT for automatical matching) Dec 11 2007 09:01AM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes normally in [0,pi,pi,0] phase for heating. current drive phase available if requested. Dec 11 2007 09:03AM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Lower Hybrid yes Body I Fault Circuits Repaired and tested. High power tests completed Dec 05 2007 06:40PM (dterry) Ron Parker Lower Hybrid dterry,parker
LPI no Oct 12 2007 12:41PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha yes Midplane working fine, emissivity profiles being stored in tree, but still need to apply in-vessel calibrations to data. WB1-LY being digitized, but not processed in tree. Dec 09 2007 06:53PM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes Working fine. Nov 29 2007 01:36PM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Working, moderate speed for now. Jan 02 2008 01:19PM (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 Initial tests on the A-port scanning probe went well. We need to take care of some control glitches that caused some component failures. May 30 2007 08:01PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE no We are basically awaiting the DNB & its new aperture. MSE itself is OK. 5 photo detectors have been shipped out for repair, so currently only 5 channels are available. We expect the full channels will be available late in Jan 08. Jan 04 2008 01:11PM (jinseok) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Voltage is on for the He3 bank. Voltage will be turned on for the global system at the first plasma attempts. Nov 26 2007 08:31AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes calibration unchanged from 2007 campaign Dec 04 2007 08:56PM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby
NINJA yes All capillaries displayed by the NINJA_CONTROL GUI have been tested. Nov 26 2007 04:26PM (terry) Brian LaBombard NINJA gas puff labombard,terry
PCI no Both CO2 and HeNe Lasers are disabled----- safe for machine entry. Sep 14 2007 03:21PM (lianglin) Miklos Porkolab Phase Contrast Imaging edlund,lianglin,ntsujii,porkolab
Penning Gauges yes All gauges except B_DivL are operating Nov 27 2007 01:31PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Nov 26 2007 04:27PM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter no Safe for Machine Entry Sep 14 2007 12:17PM (irby) Jim Irby C-Mod Polarimeter irby
Probe Array - ISD yes Operational Nov 27 2007 01:40PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes Operational Nov 27 2007 01:40PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Operational Nov 27 2007 01:41PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes Operational Nov 27 2007 01:41PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes 50, 60, 75 and 88GHz channels are connected and being tested for the campaign Dec 18 2007 10:28AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Operational, but needs to be checked with plasma. Nov 27 2007 01:45PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes FSP is operational Dec 11 2007 10:13AM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes A- and K-port WASP electrodes have been replaced/tested. Nov 27 2007 01:44PM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
TCI yes CO2 Laser is on --- initial alignment complete Nov 16 2007 01:23PM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes 8 polychromators, 1 laser. Density is uncalibrated. Jan 03 2008 08:31AM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes,yma
TS - Edge yes System is working. Alignment w.r.t. YAG is not optimized yet, so measurements may be noisy. Density is uncalibrated. Jan 09 2008 09:07AM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes,yma
Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf
XTOMO yes Data being collected in digitizers and SIGNALS nodes updated. Still playing switch-a-roo with cPCI digitizers, but data should be available. Dec 19 2007 07:14PM (mlreinke) Bob Granetz X-Ray Tomography granetz,mlreinke

Jan 9 2008 03:29:22:623PM

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 yes Diode 2pi working fine, foil 2pi being low-pass filtered to remove noise. Outboard miidplane AXUV fine. Midplane foils working fine, but need to fill tree with calibrations. 2D AXUV arrays are being digitized but need further debugging and calibration. Dec 19 2007 07:16PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization no First Boronization 5/9/07 Bottle has been removed from the cell Sep 14 2007 12:42PM (dekow) Jim Irby Boronization dekow,irby
CNPA yes Single channel CNPA available as of 12/1707 Dec 17 2007 05:48PM (parker) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor yes Cryopump is operational Dec 11 2007 10:13AM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard
CXRS yes The pedestal toroidal array was installed, spatially and absolutely calibrated. There are 10 chords intersect the beam at the major_R_range=[74.2:86.3]cm. Spatial resolution: 1.2 cm. The F-top poloidal array was installed and spatially calibrated. There are 19 chords intersect the beam at the major_R_range=[67.8:91.0]cm. Spatial resolution: 1.22 cm. Nov 27 2007 10:21AM (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 Nov 26 2007 04:23PM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes optics repaired, camera re-installed, and view has been re-calibrated Nov 27 2007 09:54AM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation no Nov 20 2007 10:47PM (granetz) Robert 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,terry
DNB no Nov 20 2007 10:47PM (granetz) Robert Granetz Diagnostic Neutral Beam beals,granetz
FRC-ECE yes Chs 17-32 working - low freq. mixer being repaired Nov 26 2007 11:41AM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes Gauge is operational and calibrated against G-side MKS on shot#1071127002 Nov 27 2007 01:25PM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
GPC yes All 9 channels operational as of new year. Jan 03 2008 09:31AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Most channels operational. Jan 02 2008 12:22PM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI no Neither the Xpt-view nor the midplane-view camera is operational. Nov 26 2007 04:25PM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes Should be operational for the FY08 campaign Nov 27 2007 09:54AM (marmar) Earl Marmar H/D Ratio marmar
Hirex Jr yes Mar 06 2007 08:59AM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr no Be Window has a leak and so the gate valve is closed Nov 23 2007 12:50PM (ince) 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 available (quarter-wave transformer for pre-matching) Dec 11 2007 09:01AM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes available (with FFT for automatical matching) Dec 11 2007 09:01AM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes normally in [0,pi,pi,0] phase for heating. current drive phase available if requested. Dec 11 2007 09:03AM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Lower Hybrid yes Body I Fault Circuits Repaired and tested. High power tests completed Dec 05 2007 06:40PM (dterry) Ron Parker Lower Hybrid dterry,parker
LPI yes 1/9/08 Jan 09 2008 03:23PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha yes Midplane working fine, emissivity profiles being stored in tree, but still need to apply in-vessel calibrations to data. WB1-LY being digitized, but not processed in tree. Dec 09 2007 06:53PM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes Working fine. Nov 29 2007 01:36PM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Working, moderate speed for now. Jan 02 2008 01:19PM (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 Initial tests on the A-port scanning probe went well. We need to take care of some control glitches that caused some component failures. May 30 2007 08:01PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE no We are basically awaiting the DNB & its new aperture. MSE itself is OK. 5 photo detectors have been shipped out for repair, so currently only 5 channels are available. We expect the full channels will be available late in Jan 08. Jan 04 2008 01:11PM (jinseok) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Voltage is on for the He3 bank. Voltage will be turned on for the global system at the first plasma attempts. Nov 26 2007 08:31AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes calibration unchanged from 2007 campaign Dec 04 2007 08:56PM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby
NINJA yes All capillaries displayed by the NINJA_CONTROL GUI have been tested. Nov 26 2007 04:26PM (terry) Brian LaBombard NINJA gas puff labombard,terry
PCI no Both CO2 and HeNe Lasers are disabled----- safe for machine entry. Sep 14 2007 03:21PM (lianglin) Miklos Porkolab Phase Contrast Imaging edlund,lianglin,ntsujii,porkolab
Penning Gauges yes All gauges except B_DivL are operating Nov 27 2007 01:31PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Nov 26 2007 04:27PM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter no Safe for Machine Entry Sep 14 2007 12:17PM (irby) Jim Irby C-Mod Polarimeter irby
Probe Array - ISD yes Operational Nov 27 2007 01:40PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes Operational Nov 27 2007 01:40PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Operational Nov 27 2007 01:41PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes Operational Nov 27 2007 01:41PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes 50, 60, 75 and 88GHz channels are connected and being tested for the campaign Dec 18 2007 10:28AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Operational, but needs to be checked with plasma. Nov 27 2007 01:45PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes FSP is operational Dec 11 2007 10:13AM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes A- and K-port WASP electrodes have been replaced/tested. Nov 27 2007 01:44PM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
TCI yes CO2 Laser is on --- initial alignment complete Nov 16 2007 01:23PM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes 8 polychromators, 1 laser. Density is uncalibrated. Jan 03 2008 08:31AM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes,yma
TS - Edge yes System is working. Alignment w.r.t. YAG is not optimized yet, so measurements may be noisy. Density is uncalibrated. Jan 09 2008 09:07AM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes,yma
Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf
XTOMO yes Data being collected in digitizers and SIGNALS nodes updated. Still playing switch-a-roo with cPCI digitizers, but data should be available. Dec 19 2007 07:14PM (mlreinke) Bob Granetz X-Ray Tomography granetz,mlreinke

Session Leader Comments
Jan 9 2008 09:23:32:977AM	1080109001	Greg Wallace	Disruption at .787 due to an injection from the LH grill. Will retry on next shot. Interesting spike in the nonthermal ECE right as LH is about to trip out.
Jan 9 2008 09:31:19:410AM	1080109002	Greg Wallace	Good shot! Lots of nonthermal ECE, good .4V reduction in Vloop, lots of hard xrays. Coupling pretty noisy around 25-30% with edge density around 4-5e17 on mid and bottom probes. Density data from top probe looks missing/unreliable. nl_04 3.2-3.5e19. Next shot will repeat with NINJA on at a 5psi puff from .55s to 1.25s.
Jan 9 2008 09:48:26:153AM	1080109003	Greg Wallace	One trip at 1.155s due to a small vacuum breakdown on the D row near column 20. Otherwise the shot looked good and retried successfully. Density increase not obvious on the LH probes. Next shot will repeat without LH on to get a baseline with gas puff and no power.
Jan 9 2008 09:55:32:340AM	1080109004	Greg Wallace	Line averaged density looked same as for shot 3 but the edge density on the LH probes was higher by a factor of 2 with the LH turned off? Next shot will increase outer gap to 2.5cm and turn LH back on.
Jan 9 2008 10:10:33:443AM	1080109005	Greg Wallace	LH ran clean at larger outer gap with the NINJA on. Next shot will repeat but with NINJA off. Coupling around 25% reflected power with edge density around 3-5e17 on mid and 2-4e17 on bottom. Top probe still doesn't look reliable. nl_04 slightly higher around 4.2-4.4e19.
Jan 9 2008 10:25:12:967AM	1080109006	Greg Wallace	Very interesting shot. Looks like we went into a locked mode which possibly killed any signs of current drive. We see a "sawtooth" nonthermal ECE signal and the loop voltage stays completely flat. Despite the NINJA being off, lots of edge density. nl_04=3.7e19 and the mid probes at 1e18 and bottom probes at .6-1e18. LH coupling at 30% reflected power. Will repeat while trying to eliminate the locked mode.
Jan 9 2008 10:39:14:383AM	1080109007	Greg Wallace	No locked mode, lots of current drive. Coupling was quite good (25% reflected power) despite no NINJA puff. nl_04 dropping from 4.3 to 3.8e19. Grill density around 3-4e17. Next shot will keep NINJA on but turn off the LH power.
Jan 9 2008 11:00:11:703AM	1080109008	Greg Wallace	nl_04 stayed steady around 3.9 to 4.2e19 with LH off and NINJA on. LH probes measured around 1e18 with no LH power. Steve Wolfe reports a locked mode during this shot so that may be the source of the high edge density. Next shot will repeat (NINJA on, LH off) trying to eliminate the locked mode.
Jan 9 2008 11:07:42:497AM	1080109009	Greg Wallace	No locked mode on this shot but density was a bit higher ~4-4.5e19 on nl_04. Probe density a bit lower around 8e17 but still pretty high for this large outer gap with no LH power. Next shot will move to 3.5cm outer gap with LH and NINJA on.
Jan 9 2008 11:22:26:180AM	1080109010	Greg Wallace	Cryo "burped" and was not working correctly on this shot. Will retry on the next shot with the cryo on to keep the density down. Coupling did not look great at beginning of shot but improved by .8s as the line averaged density rose to nearly 5.4e19.
Jan 9 2008 11:41:02:233AM	1080109011	Greg Wallace	Another locked mode, again with no current drive. LH ran clean with so-so coupling. More "sawtooth" activity on the non-thermal ECE. Will try again to see if we can make the locked mode go away.
Jan 9 2008 11:50:21:827AM	1080109012	Greg Wallace	No locked mode. Good signs of current drive with density factor of 2 lower than previous shot at the LH probes (~4e17). Coupling improved during shot as density increased from 4.5 to 5e19 on nl_04. Next shot will disable NINJA and keep LH on.
Jan 9 2008 12:10:46:067PM	1080109013	Greg Wallace	No NINJA on this shot with the LH turned on. Coupling was pretty good towards the end of the shot although the line averaged density decreased from .7 to 1.1s. Next shot will turn on NINJA and turn off LH.
Jan 9 2008 12:21:09:783PM	1080109014	Greg Wallace	Locked mode at .5s according to Steve Wolfe. This shot had NINJA but no LH. Will retry to eliminate the locked mode. nl_04 between 3.8 and 4.2e19, mid and bottom probes between .5 and 1e18.
Jan 9 2008 12:32:56:683PM	1080109015	Greg Wallace	Fizzle.
Jan 9 2008 12:40:32:697PM	1080109016	Greg Wallace	Shot ran well without locked mode. nl_04 steady around 4.8e19 and LH probes 4-5e17. Next shot will be cryo off, NINJA off, LH on.
Jan 9 2008 01:23:31:167PM	1080109017	Greg Wallace	Shot ran well with no cryo and no NINJA. LH coupling pretty good despite falling line integrated density. nl_04 falling from 4.5 to 4e19 and LH probes between 3 and 4e17. Cell access to move launcher to 5mm behind the LH limiter. Hopefully this will cause coupling to get worse without the NINJA??? Next shot will be a repeat of shot 1 with the grill moved farther back.
Jan 9 2008 01:46:25:297PM	1080109018	Greg Wallace	No feedback on the density control. Will repeat with TCI fixed. LH could not couple without the NINJA on. Density is around 1-5e16 on the LH probes.
Jan 9 2008 01:58:46:370PM	1080109019	Greg Wallace	Another locked mode. Will repeat one more time to get a baseline before turning on NINJA.
Jan 9 2008 02:09:17:680PM	1080109020	Greg Wallace	This shot worked as requested. LH could not couple with the low edge density (<1e17 on LH probes) and nl_04 was steady around 4-4.2e19. Scopes show LH launcher at 5.5mm behind the grill. Next shot will turn on NINJA and keep LH on.
Jan 9 2008 02:20:28:133PM	1080109021	Greg Wallace	Disruption at .4s. Will repeat.
Jan 9 2008 03:35:03:540PM	1080109022	Greg Wallace	Test shot.
Jan 9 2008 03:35:09:370PM	1080109023	Greg Wallace	Fizzle
Jan 9 2008 03:50:32:817PM	1080109024	Greg Wallace	Disruption at 0.31s.
Jan 9 2008 04:06:21:890PM	1080109025	Greg Wallace	LH was not able to couple with the NINJA on. No appreciable increase in density measured at the LH grill despite seeing the ionization on the LH camera. Density at the grill is 1.5-2e16 on top, 5-8e16 on mid, and .6-1.2e17 on bottom. Next shot will increase puff to 10psi from 5psi.
Jan 9 2008 04:09:18:043PM	1080109026	Greg Wallace	Another early disruption.
Jan 9 2008 04:25:11:647PM	1080109027	Greg Wallace	Fizzle.
Jan 9 2008 04:44:57:513PM	1080109028	Greg Wallace	Still no coupling during early part of pulse when LH was restriking. After restrikes ended density at the grill continued to rise. Next shot will move NINJA puff earlier. NINJA puff will trigger at .35s on the next shot.
Jan 9 2008 04:58:38:213PM	1080109029	Greg Wallace	Still no coupling although the grill density is where it was this morning where we had good coupling (3-4e17). Next shot will decrease outer gap to 0.5cm.
Jan 9 2008 05:53:40:207PM	1080109030	Greg Wallace	Many trips mostly due to big spikes in reflection, maybe from breakdown in the region in front of the grill. Nothing on the LH camera looks like breakdown in a guide but there are bright lines across the grill along the field lines. This is the only shot at 5mm behind the limiter where there was any coupling at all. Between trips the coupling was not good (~50% reflected power) although the density at the grill was ~5-6e17. This is actually greater than the density at which we had good coupling than with the 3.5cm outer gap (~4e17 for shot 17).

Physics Operator Comments
Jan 9 2008 09:14:14:853AM	1080109001	Joseph Snipes	Shot 1: Loaded shot 1071219032 and then reloaded segment 1 from shot 1080108022, which has prepuff ending at -0.4 s with a 35 ms long pulse for cryopump operation. Note that the live segment is segment 3 for an upper null 0.8 MA, 5.4 T discharge. nl04 is programmed to 3.5 x 10^19 m^-2. NINJA is off for the first shot. Disrupted at 0.79 s during the LHCD. There are bright flashes on the LH grill just before the disruption indicating a plasma surface interaction with the grill that probably caused the disruption. The startup does not look very good either.
Jan 9 2008 09:27:30:100AM	1080109002	Joseph Snipes	Shot 2: Repeat. Good shot.
Jan 9 2008 09:39:53:000AM	1080109003	Joseph Snipes	Shot 3: Repeat with NINJA puffing deuterium from 0.55 - 1.25 s. Runaways early. Startup does not look good. Otherwise it was a good shot.
Jan 9 2008 09:50:45:277AM	1080109004	Joseph Snipes	Shot 4: Increased prepuff by 5 ms to 40 ms duration. Repeat without LHCD to see the effect of the NINJA puff. Good shot.
Jan 9 2008 10:03:35:477AM	1080109005	Joseph Snipes	Shot 5: Reduced Br0 by 0.5 mT to -0.0005 T. Reduced RCUR by 0.5 cm to increase the outer gap by 1 cm. LHCD turned back on. Good shot.
Jan 9 2008 10:16:54:330AM	1080109006	Joseph Snipes	Shot 6: Reduced EF4 current from -1340 to -1325 A to raise Bz more positive at breakdown. Good shot. Breakdown has improved.
Jan 9 2008 10:33:50:323AM	1080109007	Joseph Snipes	Shot 7: Repeat. Breakdown is worse but the shot is good.
Jan 9 2008 11:43:09:657AM	1080109008	Joseph Snipes	Shot 8: Increased prepuff by 3 ms to 43 ms duration. Turned off LHCD. Good shot. Turned on argon puff at 50 ms duration. Startup is still bad.
Jan 9 2008 11:04:09:970AM	1080109009	Joseph Snipes	Shot 9: Try reducing the prepuff to 35 ms duration. Redo this shot to try to get it without the locked mode. Good shot. Startup is still bad.
Jan 9 2008 11:20:52:807AM	1080109010	Joseph Snipes	Shot 10: Increased EF4 current from -1325 to -1345 A. Decreased RCUR by 5 mm to get a 3.5 cm outer gap. Good shot. Startup is no better. Cryopump warmed up just before the shot so it was not pumping during the shot and the prepuff pressure was very high.
Jan 9 2008 11:28:49:850AM	1080109011	Joseph Snipes	Shot 11: Repeat with the cryopump cold. Good shot. Startup still looks bad.
Jan 9 2008 11:44:31:920AM	1080109012	Joseph Snipes	Shot 12: Increased RCUR offset in segment 1 from 1000 to 1500 to try to improve the startup. Increased Argon puff by 50 ms to 100 ms duration. Good shot. Startup still looks bad.
Jan 9 2008 11:59:34:307AM	1080109013	Joseph Snipes	Shot 13: Increased EF4 current by 10 A to -1355 A to reduce Bz at breakdown. Good shot.
Jan 9 2008 12:12:43:443PM	1080109014	Joseph Snipes	Shot 14: Increased prepuff by 4 ms to 39 ms duration. Startup is still not looking very good. Disrupted in rampdown at about 1.67 s.
Jan 9 2008 12:26:54:000PM	1080109015	Joseph Snipes	Shot 15: Decreased prepuff to 33 ms duration. Cryopump warmed up just before the shot so the pressure was too high. Fizzle!
Jan 9 2008 12:38:27:400PM	1080109016	Joseph Snipes	Shot 16: Repeat with cryopump cold. Good shot.
Jan 9 2008 12:53:07:490PM	1080109017	Joseph Snipes	Shot 17: Turned cryopump off. Reduced prepuff to 17 ms duration. Good shot.
Jan 9 2008 12:53:48:083PM	1080109017	Joseph Snipes	Cell access to move the LH launcher back from -1.5 to -5 mm behind the LH limiter.
Jan 9 2008 01:41:42:330PM	1080109018	Joseph Snipes	Shot 18: Cryopump back on. Increased prepuff to 38 ms duration taking into account an extra 5 ms because the DNB will be opening for the next shot and it pumps on the machine. Increased RCUR by 1 cm to reduce the outer gap to 1.5 cm. Good shot. TCI failed to provide density feedback but the density remained low.
Jan 9 2008 01:56:45:950PM	1080109019	Joseph Snipes	Shot 19: Repeat with density feedback. Good shot. Locked mode leading to disruptions in the rampdown ending at 1.79 s.
Jan 9 2008 02:11:56:583PM	1080109020	Joseph Snipes	Shot 20: Repeat without locked mode. Cryopump was warming up just before the shot but the shot went nonetheless amazingly. Indeed, the breakdown looks good at this high pressure 0.098 mTorr. Good shot.
Jan 9 2008 02:21:27:177PM	1080109021	Joseph Snipes	Shot 21: Increased prepuff to 44 ms duration. NINJA puff on. Disrupted at 0.405 s.
Jan 9 2008 02:39:37:290PM	1080109021	Joseph Snipes	It seems 6 fuses have been blown on the TF since last Friday and Bill Parkin just noticed that one of the TF converters is not working properly. So, we are stopping to replace the fuses. It will mean about an hour delay at least.
Jan 9 2008 03:29:29:920PM	1080109022	Joseph Snipes	Shot 22: Test shot for TF. OK.
Jan 9 2008 03:31:19:590PM	1080109023	Joseph Snipes	Shot 23: Increased prepuff to 50 ms duration. Fizzle!
Jan 9 2008 04:29:25:240PM	1080109024	Joseph Snipes	Shot 24: Decreased prepuff to 45 ms duration. Increased EF4 current by 10 A to -1360 A. Disrupted at 0.31 s.
Jan 9 2008 04:29:36:333PM	1080109025	Joseph Snipes	Shot 25: Br0 changed by -2 mT on shot 23. Add 1 mT to make Br0 = +0.5 mT. Good shot. Startup looks good finally.
Jan 9 2008 04:30:04:147PM	1080109026	Joseph Snipes	Shot 26: Raised NINJA pressure to 10 psi. LH has difficulty operating at -5 mm behind the limiter. Perhaps, more pressure will help. Disrupted at 0.41 s.
Jan 9 2008 04:32:00:050PM	1080109027	Joseph Snipes	Shot 27: Repeat without the disruption. Cryopump was apparently too warm as the neutral pressure was rather high around 0.09 mTorr. Fizzle!
Jan 9 2008 04:37:20:893PM	1080109028	Joseph Snipes	Shot 28: Repeat with plasma and without the disruption and with the cryopump cold. Good shot.
Jan 9 2008 04:47:58:560PM	1080109029	Joseph Snipes	Shot 29: NINJA puff start time changed to 0.35 s so that the puff should enter the plasma around 0.5 s. Increased prepuff by 4 ms to 49 ms duration. Reduced Br0 offset to 0. Good shot.
Jan 9 2008 05:02:03:070PM	1080109030	Joseph Snipes	Shot 30: Increased RCUR by 4 mm to decrease the outer gap to about 0.5 cm. Decreased abs(EF4) current by 15 A to -1350 A. Good shot.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:09:20:577AM	Plasma	Ok
2	09:22:05:460AM	Plasma	Ok
3	09:36:23:660AM	Plasma	Ok
4	09:49:00:467AM	Plasma	Ok
5	10:01:50:680AM	Plasma	Ok
6	10:14:42:347AM	Plasma	Ok
7	10:27:15:310AM	Plasma	Ok
8	10:39:50:197AM	Plasma	Ok
9	11:01:51:720AM	Plasma	Ok
10	11:14:20:370AM	Plasma	Ok
11	11:26:38:303AM	Plasma	Ok
12	11:41:56:860AM	Plasma	Ok
13	11:57:06:713AM	Plasma	Ok
14	12:09:38:257PM	Plasma	Ok
15	12:22:45:940PM	Plasma	Ok
16	12:35:12:637PM	Plasma	Ok
17	12:47:38:647PM	Plasma	Ok
18	01:37:52:130PM	Plasma	Ok
19	01:51:16:810PM	Plasma	Ok
20	02:03:44:477PM	Plasma	Ok
21	02:16:56:583PM	Plasma	Ok
22	03:17:15:953PM	Test	Ok	100KA TF test PLC control
23	03:29:37:123PM	Plasma	Ok
24	03:42:16:587PM	Plasma	Ok
25	03:55:03:160PM	Plasma	Ok
26	04:07:25:797PM	Plasma	Ok	PF breaker pulled after plasma disrupted
27	04:20:19:790PM	Plasma	Ok
28	04:32:57:753PM	Plasma	Ok
29	04:46:19:577PM	Plasma	Ok
30	04:59:36:040PM	Plasma	Ok