Alcator C-Mod Run 1110126 Information

Miniproposals

Miniproposal: 614

Date Filed: 7/23/2010

Title: Pedestal modifications with lower hybrid in EDA H-mode

First Author: Jerry Hughes

Session Leader: Jerry Hughes (shots 1-31)

Operators
Session leader(s):	Jerry Hughes
Physics operator(s):	Syunichi Shiraiwa
Engineering operator(s):	Bill Parkin,Bill Byford,Gary Dekow

Engineering Operator Run Comment
MP 614. Pedestal modifications with lower hybrid in EDA H-mode

Session Leader Plans

Entered: Jan 25 2011 04:47:46:720PM

Author: Jerry Hughes

Run plan for 1110126
MP 614. Pedestal modifications with lower hybrid in EDA H-mode

Overnight boronization requested, followed by He ECDC. Use recipe from latest
boronization.

Special gas request:
Fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1)
Fill H-bottom with 2 psi Ne Hybrid DISABLED (PG5)
Fill NINJA with 8 psi He.

ICRF: all transmitters available
LH: make available, but not on first shot, set up as on 1101202:
>>50kV
>>90 Degree phasing
>>start at 0.9 sec
>>stop at 1.4 sec
>>launcher at 0.1 mm or 1270

Cryopump: yes, available on first shot.
DNB: yes

Requested diagnostics: TS, ECE, TCI, HXR camera, div probes, bolos, Ly-a,
reflectometry, fast magnetics, Edge CXRS, SOL reflectomery, PCI.
Special request for LH group: spectrum analyzer connected to probe on LH grill

Starting shot:

Load from 1101202030. 5.4T, 600kA, target nl04=6x1019m-2. SSEP=-0.8cm.
Cryopump ON. Pulse PG1 from 0.30 to 0.35s for diagnostic Ar, but leave
B-side lower disabled for first shot. Set H-bottom to chop and program a 70V
PG5 pulse from 0.35 to 0.45s.

Shot plan:

(1) Begin boronization recovery. Allow ICRF to exercise antennas from 0.6 to
1.5s in each shot until >2MW is cleanly obtained from some combination of
J+E. Exercise D also. Lower Ne pulse steadily shot to shot and confirm
steady EDA H-mode can be maintained. Attempt to proceed with zero Ne puffing,
although if heat loading or injections begin to look problematic, seed some more. Allow NINJA puff after 1.1s for GPI shake-down.
NO LOWER HYBRID YET!
(3--5 shots)

(2) Turn off NINJA. Program flat Prf=2MW. Inject LH power at n_||=1.9,
ramping Plh from 100kW to 600kW from 0.9 to 1.4s. Use this ramp for the first
guess for threshold power, P0, for the density pump-out effect. Put NINJA
back on and repeat shot with flat LH power program at levels of P0, P0-100kW,
and P0+100kW. If the NINJA puffs are detrimental, reduce them or turn them off.
If the NINJA puffs seem non-perturbative, run a case with GPI and zero LH power.
(5--6 shots)

(3) Launch LH power from only the central sets of columns, at maximum
level feasible, using the same n_||. This configuration should allow
phase change on demand. Take comparison shot with counter-Ip phasing,
and then one with heating phasing.
(4--5 shots)

(4) Taking a suitable case from above, increase Ip by 0.1MA shot
by shot until either pedestal modification is no longer observed, or we
can no longer get steady H-modes. If plasmas go ELM-free, try putting in
LH before ICRF, or attempt to ramp Ip up during an already established
H-mode.
(5--7 shots)

(5) ICRF power scan. Take a well-established case from earlier steps and
increase power. At 1.1s, step ICRF power up by 0.5MW, and at 1.25s, step up
again by 0.5MW (or to max available). It is okay to try D-port out.
Next, run a case in which ICRF is stepped down by 0.5MW at 1.1s,
and then again at 1.25s. Then, to establish a control, rerun these shots
with Plh=0.
(4--6 shots)

Physics Operators Plans

Entered: Jan 25 2011 05:36:30:960PM

Author: Syunichi Shiraiwa

Run plan for 1110126
MP 614. Pedestal modifications with lower hybrid in EDA H-mode

Session leaders: J. Hughes
Physics operator: S. Shiraiwa

Run will start at 09:00 and end at 17:00

Overnight boronization requested, followed by He ECDC. Use recipe from latest
boronization.

Power systems as on: 1101202030. (LSN, 5.4T, 600kA, target nl04=6x1019m-2, Cryopump on)

A-coil configuration: +Dtop -Dbot -Jtop +Jbot; Hybrid enabled (standard
configuration)

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 He Hybrid enabled (PG3)
fill NINJA with 8 psi He DISABLED
Fill H-bottom with 2 psi Ne Hybrid DISABLED (PG5)

Requested diagnostics: See SL plan

Session Leader Summaries

Entered: Jan 26 2011 05:28:50:143PM

Author: Jerry Hughes

SL summary for 1110126
MP614.

The goal of today's run was to further explore and understand the
pedestal modifications that are observed in some EDA H-modes upon
application of lower hybrid power. We began the run by reproducing a
suitable target shot, 1101202030. This is a 600kA, 5.4T shot with SSEP
of of -8mm. With 500kW of LH power, this target shot exhibited a clear
density reduction and temperature boost. We spent much of today's run
trying to emulate this result. Somewhat complicating the
interpretation of today's result was the fact that the main fueling
was set up with He, rather than D2, by mistake. This was suspected and
reported by C. Fiore, based on low neutron rates, by mid-afternoon. It
was in fact found to be the case by S. Wolfe around 4:30 after a
series of duds led us to look carefully at the discharge setup. I will
have to examine the data to try to determine what, if any data, have
enough D fraction to be useful. But it seems unlikely at this stage
that we can study these alongside the D plasmas of previous runs.

Nonetheless, there are some things to report:

On several shots we were successful inobtaining steady EDA H-modes
with reduced density and enhanced Te,ped. However the effect was not
as strong as had been previously observed in D plasmas, and the
evolution following LH turn-on or turn-off seemed to happen on slower
time scales.

We had fairly clean H-modes early (002, 003, 007, 008, 009), but the
Mo started to hit us hard after a few shots, and we had a distressing
series of shots in which the rate of rise of radiation in the H-modes
was increasing shot to shot. Ultimately we ameliorated this with an
increase in target density, although after that we never got the
H-mode density back down to the levels of earlier in the day.

I decided not to try the piece of the plan that involved a phasing
scan from the central columns of the LH launcher, at reduced
power. This looked unlikely to pay off, since we were having trouble
seeing much effect on the plasma at the 200-300kW level, and
G. Wallace estimated it could take several shots even to condition the
central columns to that level of power.

As Mo radiation had risen anyway, it made sense to move forward with
the ICRF power scan. Shots 024, 026 and 027 coupled between 3.8 and 4.9MW of
ICRF concurrent with LH being injected into EDA H-modes. Notably, LH
tolerated up to 1MW from D-port, which conventional wisdom says is not
feasible, at least in D discharges.

Physics Operator Summaries

Entered: Jan 27 2011 11:23:23:600AM

Author: Syunichi Shiraiwa

PO mistake day.

B-main (C-side) was requested to be He instead of D, in PO plan.

During a run, there were couple of Indications of this mistake
1) very small neutron rate (as suggested by C. Fiore)
2) low Ha signal compared to the reference
However, it was not determined until we had two dud in shot 25 and 26 and S. Wolfe, J. Irby,
and SL checked the all setup.

Besides the mistake, C-Mod itself run well. 23 plasmas continued until the ramp-down phase.
We had three dud in late afternoon and 5 Xray shutdown in the morning. X-ray shutdown also might have been the indication of He.

Session Leader Comments

Jan 26 2011 09:02:41:577AM 1110126001 Jerry Hughes Shot 1:

We are delayed waiting for ICRF to get through test shots.

Jan 26 2011 09:38:51:447AM 1110126001 Jerry Hughes Shot 1.

Attempt: Boronization recovery.

Result: Plasma, L-mode. Got some RF from J and D.
Ne puffing seems to have worked, although it was incorrectly programmed
to be 50ms instead of 100ms. PO is correcting for next shot.
Thomson data look pretty clean.
Shape looks decent.
PCI, magnetics, reflectometry are taking data.

Jan 26 2011 09:48:53:830AM 1110126002 Jerry Hughes Shot 2:

Attempt: More boronization recovery.

Result: Plasma, with RF from D and J. H-mode. ne,ped~1.8e20
Looks like we got the Ne in that we wanted.

FFT on E-port still not working. Rick will try to get 2MW out of J-port on next
shot.

Jan 26 2011 10:04:27:030AM 1110126003 Jerry Hughes Shot 3.

Attempt: Continue bringing up J, try for some E-port.

Result: Plasma. Steady H-mode.
Not bad. 2MW from J-port. E-port fired without FFT.
D-port working well at 1MW level.

Next shot. Put in some LH on next shot.

Jan 26 2011 10:19:10:697AM 1110126004 Jerry Hughes Shot 4.

Attempt: Move on to first piece of actual run plan. Put in a LH ramp.

Result: Early disruption

Jan 26 2011 10:33:43:537AM 1110126005 Jerry Hughes Shot 5.

Attempt: Retry

Result: Another early disruption. Impurities are coming in, starting at 0.26s.
I can't find anything obviously wrong with the discharge/startup. Injections
are reported from the D-port area. Fe/Mo. Thanks, Matt.

Jan 26 2011 10:44:54:810AM 1110126006 Jerry Hughes Shot 6.

Attempt: Retry

Result: Plasma. Brief H-mode. J-port faults and the plasma drops back into
L-mode before the LH comes on. The LH looks good, and seems to make some
non-thermals. However, the LH program is actually not what was
requested. Put in ramp for next shot. Also, we will add some power from
E-port.

Jan 26 2011 11:03:40:740AM 1110126007 Jerry Hughes Shot 7.

Result: Good H-mode, steady RF from J+E.
Clean LH too, although the ramp doesn't seem to have much of an effect
on the plasma. Confinement steadily degrades.

May be over dense with neutrals, post-boronization. Radiation seems to be
pretty small, and constant, so that doesn't seem to be the problem.
Take another shot with 600kW flat LH power. See what happens.

Jan 26 2011 11:18:48:087AM 1110126008 Jerry Hughes Shot 8.

Result: Long, steady H-mode with steady ne drop and Prad drop.
Some hash on the Dalpha during the LH pulse.
When LH turns off at 1.4s, nebar comes back up.

Jan 26 2011 11:31:36:893AM 1110126009 Jerry Hughes Shot 9.

Attempt. Repeat shot 8 with reduced Ne. PG5 from 70V to 40V.

Result: Pretty clean H-mode. Desnity drop and Te rise is a little more
evident when LH comes on.
Matt informs me I may have the optimimum level of Ne, based on the Mo
time trace when RF comes on.

Next. Have PO raise ZCUR while LH is on, and see if that has an impact on
density. Will probably stay LSN.

Jan 26 2011 11:48:21:190AM 1110126010 Jerry Hughes Shot 10.

Very early disruption.

Jan 26 2011 12:00:56:030PM 1110126011 Jerry Hughes Shot 11.

Attempt: Retry 9, with ZCUR ramp from 1.0 to 1.4s.

Result: H-modes, 2nd one steady. Density reduction begins around 1.23s. SSEP
is ~-5mm.

Next: Keep ZCUR flat at a somewhat higher value, giving SSEP~-5mm.
Also, NINJA will puff He at 1.3s

Jan 26 2011 12:07:28:483PM 1110126012 Jerry Hughes Shot 12.

Result: DPCS shut down discharge early due to early hards.

Jan 26 2011 12:25:42:317PM 1110126013 Jerry Hughes
Shot 13.

Result: Got the plasma back. ZCUR is up early, and may be making it harder to
access H-mode. Dithers from 0.7s to 0.9s, then H-mode. LH power may have
been the thing that kicked it in.
With LH on, H-mode nebar is 1.8e20. neped is 1.3e20.
Density rises after LH turn-off.

GPI has plenty of signal from the He puff at 1.3s.

Next: More RF power.

Jan 26 2011 12:35:16:630PM 1110126014 Jerry Hughes Shot 14.

Attempt: Retry 13 with more ICRF power.

Result: H-mode, back to L at 0.896s due to radiation. Bad Mo rising.
2nd H-mode has reduced density, Prad.

Next: up the Ne. PG5 to 60V.

Jan 26 2011 12:56:05:870PM 1110126015 Jerry Hughes Shot 15.

Attempt: Retry 14 with more Ne.

Result: EDA H-mode interuptted by an injection at 1.3s.
Early H-mode pretty radiative. This seems to be fixed by the LH turn
on.
GPI getting good time series data before and after LH turn-off at 1.4s.

Next: Let's advance the entire LH pulse by 0.1s.

Jan 26 2011 01:08:54:820PM 1110126016 Jerry Hughes Shot 16:

Attempt: Shot 15 with early LH onset.

Result: Another drop in radiation as the H-mode evolves. It is delayed until
well after LH turn-on. Density re-rises after LH turn-off.

The previously observed pedestal effects are pretty weak today, although
we are getting a lot of new data from the GPI and SOL reflectometer.

Before going to the co vs. counter scan, we need to see whether 300kW
is enough to have a measurable effect on the plasma. That will be the next
shot.

Jan 26 2011 01:33:12:643PM 1110126017 Jerry Hughes Shot 17:

Attempt: Repeat with reduced LH power

Result: Multiple H-modes, relatively high Prad.
LH never fired. So, we have a control shot.

No TS.

Jan 26 2011 01:42:45:880PM 1110126018 Jerry Hughes Shot 18.

Attempt: Repeat 16 with 300kW LH power.

Result: Similar traces all around, except a faster Prad rise and a H-L
transition at 0.85s.
Discharge conditions at 1.3s are very similar to shot 016, except higher Prad,
lower Tped.

Jan 26 2011 01:59:26:607PM 1110126019 Jerry Hughes
Shot 19.

Attempt: Ne pulse delayed 50ms (MLR's suggestion).
Also reduce LH power to 200kW, see whether any effect remains.

Result: Not so pretty.
1st H-mode evolves the same way, radiating to a H-L. 2nd H-mode is not much
better. Disrupts at 1.25s.

Jan 26 2011 02:13:28:510PM 1110126020 Jerry Hughes
Shot 20.

Greg says 300kW is possible from the center columns, but it would take a few
shots to work up to it. Based on the 200kW and 300kW results so far,
I would not expect a strong payoff, assuming we accomplished this.

So, for this shot, we will raise the LH power to the level it was at on shot 15.

Result: More transient, radiative H-modes.
LH is not so well behaved anymore. It only successfully injects power
when we are in L-mode.

Jan 26 2011 02:35:03:127PM 1110126021 Jerry Hughes
Shot 21

Attempt: Change things up a little bit. Put in LH starting at 0.55s, pre-ICRF.

Result: Not much better in terms of initial H-mode quality.

Next: Ohmic-phase density has come down between shot 15 and now. Maybe it's
time to push it up and see if we can't steady out the initial H-mode.

Jan 26 2011 02:42:20:990PM 1110126022 Jerry Hughes Shot 22.

Result: Shut down early due to runaways.

Jan 26 2011 03:05:16:050PM 1110126023 Jerry Hughes Shot 23

Result: Multiple H-modes. Edge Te is pretty low, Prad high.
Looking marginal to sustaining the H-mode at this level of Pnet.

Next request more ICRF.

Jan 26 2011 03:22:55:790PM 1110126024 Jerry Hughes Shot 24.

Attempt: Repeat with more ICRF

Result: That's better. After some initial transient H-modes, we have a
steady EDA period with a density reduction, then a density rebuild after
LH turns off.

Jan 26 2011 03:31:52:273PM 1110126025 Jerry Hughes Shot 25:

Attempt: Repeat shot 24, but put in some D-port power at 1.2s.

Result: Dud

Jan 26 2011 03:51:06:857PM 1110126026 Jerry Hughes Shot 26.

Attempt: Repeat shot 24, but put in some D-port power at 1.2s.

Result: Continuous H-mode from 0.68s to 1.5s!
Almost 4MW of RF until 1.2s, then D-port injects 0.5MW.
LH stays on during D-port pulse.
Interestingly, the density starts to rise, when D-port turns on.

Jan 26 2011 04:06:14:727PM 1110126027 Jerry Hughes Shot 27

Attempt: More RF from D

Result: And LH doesn't mind! Density creeps up with D on still. Perhaps
just outgassing?

This makes things a little ambiguous, so turn off D for next shot.
Next: Repeat shot 024 with Ip increased to 700kA.

Jan 26 2011 04:14:32:717PM 1110126028 Jerry Hughes Shot 28:

Attempt: Ip=700kA

Result: Short H-mode (J-port faults and doesn't recover.)

Next Yijun will try to keep J on. PO will put in a slight increase to the nl04
target.

Jan 26 2011 04:22:56:143PM 1110126029 Jerry Hughes Shot 29.

Result: Dud. 2nd one today.

Jan 26 2011 04:35:58:550PM 1110126030 Jerry Hughes Shot 30.

Result: Dud III

Jan 26 2011 05:28:03:560PM 1110126031 Jerry Hughes Shot 31.

Result: Shot ran.

It has been discovered that the main fueling puff was He all day today, and not
D2.

Physics Operator Comments

Jan 26 2011 09:33:13:367AM 1110126001 Syunichi Shiraiwa Load 1101202030, PG1 and PG5 program modified.
PG5 (H-buttom) Enabled

Looks ok. PG5 was 0.05s instead of 0.1 s.

Next : correct pg5 pulse length

Jan 26 2011 09:55:59:450AM 1110126002 Syunichi Shiraiwa Looks Okey

Next : fix GPC2 Te0

Jan 26 2011 10:08:06:947AM 1110126003 Syunichi Shiraiwa Looks Okey

Next : No change in PCS

Jan 26 2011 10:26:00:653AM 1110126004 Syunichi Shiraiwa Something dropped from the top...?

Jan 26 2011 10:26:46:937AM 1110126005 Syunichi Shiraiwa Appears to be same but plasma continued a little longer
Something dropped from the top...?

Jan 26 2011 11:00:44:800AM 1110126007 Syunichi Shiraiwa Full length. Clean H-mode

Jan 26 2011 11:05:44:680AM 1110126008 Syunichi Shiraiwa Full length. Clean H-mode

Jan 26 2011 11:11:41:503AM 1110126008 Syunichi Shiraiwa Good H-mod

Next: PG5 voltage will be reduced from 70 to 40 V

Jan 26 2011 11:31:28:110AM 1110126009 Syunichi Shiraiwa Good shot

Next : move ZCUR upward by 1cm from 1.0s to 1.4s

Jan 26 2011 11:50:58:263AM 1110126010 Syunichi Shiraiwa Disrupted during a ramp-up

Next: retry

Jan 26 2011 11:59:47:733AM 1110126011 Syunichi Shiraiwa Full length

Next : Add Ninja puff and adjust ZCUR so that it stays the position at 1.25 s of shot 10.
(ZCUR = -0.002)

Jan 26 2011 12:08:35:503PM 1110126012 Syunichi Shiraiwa Soft ramp-down due to X-ray.

Next : retry. ZCUR was made to be the same as shot 10 until 0.45s

Jan 26 2011 12:26:15:367PM 1110126013 Syunichi Shiraiwa Full length.
Entered the steady H-mode after LH.

Next : Repeat with more ICRF

Jan 26 2011 12:34:56:400PM 1110126014 Syunichi Shiraiwa Full length.

Next : Raise Ne puff from 40V to 60V

Jan 26 2011 12:51:54:340PM 1110126015 Syunichi Shiraiwa Full length
Injection at 1.35s

Next:

Jan 26 2011 12:54:03:943PM 1110126015 Syunichi Shiraiwa Full length
Injection at 1.35s

Next: No change in PCS

Jan 26 2011 01:22:04:577PM 1110126017 Syunichi Shiraiwa Full length, No LH

Jan 26 2011 01:47:00:743PM 1110126018 Syunichi Shiraiwa LH ok this time.

Next: Move PG5 by 50 ms later (from 0.4 to 0.5s)

Jan 26 2011 01:58:57:970PM 1110126019 Syunichi Shiraiwa Disrupted at 1.25s

Next:

Jan 26 2011 02:58:23:430PM 1110126022 Syunichi Shiraiwa Shut down due to early disruption

Jan 26 2011 02:58:07:220PM 1110126023 Syunichi Shiraiwa Full length

Jan 26 2011 03:58:48:440PM 1110126026 Syunichi Shiraiwa Full length

Next: No change in PCS

Jan 26 2011 04:03:16:077PM 1110126027 Syunichi Shiraiwa Ok

Next: Increase Ip to 700kA from 600kA

Jan 26 2011 04:14:36:703PM 1110126028 Syunichi Shiraiwa LH/ICRF many trips.

Next: Increase target density to 8e19, hoping H-mode improves the LH coupling too.

Jan 26 2011 04:26:47:047PM 1110126029 Syunichi Shiraiwa Dud

Next: Repeat

Engineering Operator Comments

Shot Time Type Status Comment

1 09:22:27:547AM Plasma Ok

2 09:38:06:617AM Plasma Ok

3 09:54:58:470AM Plasma Ok

4 10:09:45:487AM Plasma Ok

5 10:22:24:003AM Plasma Ok

6 10:34:54:323AM Plasma Ok

7 10:48:18:770AM Plasma Ok

8 11:02:30:623AM Plasma Ok

9 11:16:31:333AM Plasma Ok

10 11:31:10:480AM Plasma Ok

11 11:45:00:373AM Plasma Ok

12 11:59:05:653AM Plasma Ok

13 12:11:53:727PM Plasma Ok

14 12:25:55:377PM Plasma Ok

15 12:39:40:343PM Plasma Ok

16 12:59:39:663PM Plasma Ok

17 01:14:27:180PM Plasma Ok

18 01:33:11:940PM Plasma Ok

19 01:51:49:367PM Plasma Ok

20 02:07:35:590PM Plasma Ok

21 02:23:20:417PM Plasma Ok

22 02:38:24:260PM Plasma Ok

23 02:53:56:397PM Plasma Ok

24 03:08:38:147PM Plasma Ok

25 03:23:16:383PM Plasma Ok

26 03:36:29:160PM Plasma Ok

27 03:50:03:097PM Plasma Ok

28 04:04:43:267PM Plasma Ok

29 04:18:32:647PM Plasma Ok

30 04:32:04:283PM Plasma Ok

31 04:50:51:220PM Plasma Ok

System Availability

Jan 26 2011 09:20:20:860AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD no secured - tagged out Jun 02 2008 11:03AM (sears) Joe Snipes Active MHD Antenna sears,snipes
BES yes BES system is online Oct 21 2010 11:33AM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan
Bolometers yes 2pi (D+F) working. All midplane and off-midplane diode arrays working except WB1AX. Midplane foils calibrated and PRAD_MAIN is being filled. Divertor/Ledge foils not yet ready. Jul 15 2010 08:27AM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization yes Nov 16 2010 02:36PM (dekow) Jim Irby Boronization dekow,irby
CNPA yes Multiple channel CNPA available Oct 21 2010 07:11PM (parker) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor no Shut down. Helium dewar removed. LN2 manual valve and solenoid valves are closed and tagged. Apr 06 2010 10:51AM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard
CXRS yes Wide-view CXRS system is online Oct 21 2010 11:33AM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,liao,rachmcd,rowan
D Alpha yes \ha2_bright is available; \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 is not available Jul 01 2009 09:45AM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes system is aligned; new calibrations (relative brightness and position) not yet implemented Jun 29 2010 10:27AM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation yes operational, but turned off Nov 03 2009 04:59PM (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 in test mode only Nov 03 2009 05:01PM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,gung
ECDC yes Operational Jun 26 2010 09:28PM (irby) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer
FRC-ECE yes All channels working and calibrated. Oct 27 2010 03:41PM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes Gauges are operational. Jun 28 2010 08:02PM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
Glow Discharge no Plugs for Power Supply and Controls have been unplugged and red tagged making system safe for In-Vessel Access. Apr 05 2010 11:18AM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby
GPC yes Operational. Jul 28 2009 04:23PM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Most channels operational. Oct 22 2010 11:46AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI yes The Xpt-view, the midplane-view cameras are operational. The innerwall GPI (coupled to the fast-diodes) is available. Jul 01 2009 09:45AM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes operating normally Jun 29 2010 10:26AM (marmar) Earl Marmar H/D Ratio marmar
HEAT yes Jun 26 2010 11:19PM (dekow) Gary Dekow - Machine Heaters - burke,dekow
Hirex Jr yes Hirex-Jr has been installed Jun 28 2010 03:36PM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr yes System installed and aligned. Inverted Profiles for Ti are available upon request. Vtor profiles still under revision. Dec 17 2010 09:25AM (ypodpaly) John Rice High Resolution X-Ray ince,rice,ypodpaly
HXR yes 32 Channels operational Oct 23 2010 01:41PM (parker) Ron Parker Hard X-Ray Array faust,parker,schmidt
ICRF D-Antenna yes system checked out ok on 11006728. Jun 28 2010 04:57PM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes system checked out ok on 1100628 Jun 28 2010 04:57PM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes system checked out ok. conditioned to vacuum. Jun 28 2010 04:58PM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Laser Blow-Off yes operational and tested Jul 20 2010 04:42PM (g) Martin Greenwald Impurity Injection System g,nthoward
Lower Hybrid yes LH working. New directional couplers installed at input to each klystron. Oct 21 2010 11:42AM (dterry) Ron Parker Lower Hybrid dterry,parker,wallaceg
Lower Hybrid Reflectometer yes 50GHz: up-, 60 GHz up- and down- Oct 21 2010 11:31AM (sgbaek) Arturo Dominguez Lower Hybrid Reflectometer dominguez,marmar,parker,sgbaek
Lower Hybrid SOL reflectometer yes profiles and fluctuations both working. If requested, please request LH launcher to be moved in. Jan 18 2011 03:07PM (cornwall) Cornwall Lau Lower Hybrid SOL reflectometer cornwall,wukitch,ylin
LPI no Beam line removed May 30 2008 02:09PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha no WB4LY and LLY working but not during ICRF. WB1LY not attached due to pickup problems. LYMID attached but have profile problems. Aug 24 2010 09:17AM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes Spectra being collected and tree filled. Wavelength scan is broken so fixed on the Mo XXXI and XXXII lines. Jul 15 2010 08:28AM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Operational. Oct 22 2010 11:46AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes Gauges are operational Jun 28 2010 08:02PM (labombard) Brian LaBombard Baratron pressure gauges labombard
MLP no System is in edge lab. Version 2 drivers ready to test. Needs a student to help work on it. Jul 14 2009 09:20PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE no As of 6/10/09, MSE is calibrated & ready to go. Awaiting DNB. Jun 10 2009 10:34AM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes All systems are on and functional Jun 29 2010 12:56PM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes PMT Neuts_hards, ssd_x01, ssd_x02, ssd_x03 Jun 26 2010 09:21PM (irby) Jim Irby X-Ray/Neutron Detectors at K-Hor irby
NINJA no Capillaries tested in-vessel. Jun 28 2010 08:08PM (labombard) Brian LaBombard NINJA gas puff labombard,terry
PCI yes Operational. AM (2 * 39.51) MHz. Dec 13 2010 05:29PM (ntsujii) Miklos Porkolab Phase Contrast Imaging ennever,ntsujii,porkolab
Penning Gauges no High voltage power supplies are turned off, waiting for work at A-port horizontal to be finished. Jun 28 2010 08:07PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Jul 01 2009 09:46AM (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
Power - Alternator Air Switch yes Jun 26 2010 11:19PM (dekow) Gary Dekow feeds all the other supplies cochran,dekow,dterry,irby
Power - PEI yes Jun 26 2010 11:19PM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby
Power - TMX yes Jun 26 2010 11:19PM (dekow) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby
Power Systems yes Jun 26 2010 11:20PM (dekow) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby
Probe Array - ISD yes Operational. Jun 28 2010 08:03PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes Operational. Jun 28 2010 08:03PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes F and J outer divertor probes are operational. Jun 28 2010 08:04PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes Operational, except probe#13 Jun 28 2010 08:04PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes As of 1101123, the 60, 88u, 88l, 140 and variable set at 115GHz are operational. The 50, 75 and 112 are nonoperational. On 1101123, the noise band at ~200kHz is again seen on the 88u and 88l channels. Nov 23 2010 09:30AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Operational. New Langmuir-Mach probe head installed. Jun 28 2010 08:05PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Operational. Jun 28 2010 08:05PM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes Both A and K units are operational. Coil polarity needs to be checked. Jun 28 2010 08:06PM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
Sparker yes HV supply on, cable run to sparker at k-hor Jun 23 2010 02:41PM (irby) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin
Surface Science Station yes SSS installed and leak tested. Oct 21 2010 11:31AM (ochoukov) Bruce Lipschultz Radially scanning probe located on K-port blip,ochoukov
TCI yes No new CO2 detector, so still missing edge channels Jun 23 2010 02:40PM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes Operating with 2 lasers Oct 22 2010 01:06PM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes,yma
TS - Edge yes Operational Jul 14 2010 11:54AM (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
XEUS yes Raw spectra stored but not line brightness time histories are going into the tree yet. Jan 20 2011 10:45AM (mlreinke) Matt Reinke X-ray Extended Ultraviolet Spectrometer mlreinke
XTOMO yes Core system working. Edge system waiting for H-modes. Jul 01 2010 11:55AM (mlreinke) Bob Granetz X-Ray Tomography granetz,mlreinke

Session Leader Comments
Jan 26 2011 09:02:41:577AM	1110126001	Jerry Hughes	Shot 1: We are delayed waiting for ICRF to get through test shots.
Jan 26 2011 09:38:51:447AM	1110126001	Jerry Hughes	Shot 1. Attempt: Boronization recovery. Result: Plasma, L-mode. Got some RF from J and D. Ne puffing seems to have worked, although it was incorrectly programmed to be 50ms instead of 100ms. PO is correcting for next shot. Thomson data look pretty clean. Shape looks decent. PCI, magnetics, reflectometry are taking data.
Jan 26 2011 09:48:53:830AM	1110126002	Jerry Hughes	Shot 2: Attempt: More boronization recovery. Result: Plasma, with RF from D and J. H-mode. ne,ped~1.8e20 Looks like we got the Ne in that we wanted. FFT on E-port still not working. Rick will try to get 2MW out of J-port on next shot.
Jan 26 2011 10:04:27:030AM	1110126003	Jerry Hughes	Shot 3. Attempt: Continue bringing up J, try for some E-port. Result: Plasma. Steady H-mode. Not bad. 2MW from J-port. E-port fired without FFT. D-port working well at 1MW level. Next shot. Put in some LH on next shot.
Jan 26 2011 10:19:10:697AM	1110126004	Jerry Hughes	Shot 4. Attempt: Move on to first piece of actual run plan. Put in a LH ramp. Result: Early disruption
Jan 26 2011 10:33:43:537AM	1110126005	Jerry Hughes	Shot 5. Attempt: Retry Result: Another early disruption. Impurities are coming in, starting at 0.26s. I can't find anything obviously wrong with the discharge/startup. Injections are reported from the D-port area. Fe/Mo. Thanks, Matt.
Jan 26 2011 10:44:54:810AM	1110126006	Jerry Hughes	Shot 6. Attempt: Retry Result: Plasma. Brief H-mode. J-port faults and the plasma drops back into L-mode before the LH comes on. The LH looks good, and seems to make some non-thermals. However, the LH program is actually not what was requested. Put in ramp for next shot. Also, we will add some power from E-port.
Jan 26 2011 11:03:40:740AM	1110126007	Jerry Hughes	Shot 7. Result: Good H-mode, steady RF from J+E. Clean LH too, although the ramp doesn't seem to have much of an effect on the plasma. Confinement steadily degrades. May be over dense with neutrals, post-boronization. Radiation seems to be pretty small, and constant, so that doesn't seem to be the problem. Take another shot with 600kW flat LH power. See what happens.
Jan 26 2011 11:18:48:087AM	1110126008	Jerry Hughes	Shot 8. Result: Long, steady H-mode with steady ne drop and Prad drop. Some hash on the Dalpha during the LH pulse. When LH turns off at 1.4s, nebar comes back up.
Jan 26 2011 11:31:36:893AM	1110126009	Jerry Hughes	Shot 9. Attempt. Repeat shot 8 with reduced Ne. PG5 from 70V to 40V. Result: Pretty clean H-mode. Desnity drop and Te rise is a little more evident when LH comes on. Matt informs me I may have the optimimum level of Ne, based on the Mo time trace when RF comes on. Next. Have PO raise ZCUR while LH is on, and see if that has an impact on density. Will probably stay LSN.
Jan 26 2011 11:48:21:190AM	1110126010	Jerry Hughes	Shot 10. Very early disruption.
Jan 26 2011 12:00:56:030PM	1110126011	Jerry Hughes	Shot 11. Attempt: Retry 9, with ZCUR ramp from 1.0 to 1.4s. Result: H-modes, 2nd one steady. Density reduction begins around 1.23s. SSEP is ~-5mm. Next: Keep ZCUR flat at a somewhat higher value, giving SSEP~-5mm. Also, NINJA will puff He at 1.3s
Jan 26 2011 12:07:28:483PM	1110126012	Jerry Hughes	Shot 12. Result: DPCS shut down discharge early due to early hards.
Jan 26 2011 12:25:42:317PM	1110126013	Jerry Hughes	Shot 13. Result: Got the plasma back. ZCUR is up early, and may be making it harder to access H-mode. Dithers from 0.7s to 0.9s, then H-mode. LH power may have been the thing that kicked it in. With LH on, H-mode nebar is 1.8e20. neped is 1.3e20. Density rises after LH turn-off. GPI has plenty of signal from the He puff at 1.3s. Next: More RF power.
Jan 26 2011 12:35:16:630PM	1110126014	Jerry Hughes	Shot 14. Attempt: Retry 13 with more ICRF power. Result: H-mode, back to L at 0.896s due to radiation. Bad Mo rising. 2nd H-mode has reduced density, Prad. Next: up the Ne. PG5 to 60V.
Jan 26 2011 12:56:05:870PM	1110126015	Jerry Hughes	Shot 15. Attempt: Retry 14 with more Ne. Result: EDA H-mode interuptted by an injection at 1.3s. Early H-mode pretty radiative. This seems to be fixed by the LH turn on. GPI getting good time series data before and after LH turn-off at 1.4s. Next: Let's advance the entire LH pulse by 0.1s.
Jan 26 2011 01:08:54:820PM	1110126016	Jerry Hughes	Shot 16: Attempt: Shot 15 with early LH onset. Result: Another drop in radiation as the H-mode evolves. It is delayed until well after LH turn-on. Density re-rises after LH turn-off. The previously observed pedestal effects are pretty weak today, although we are getting a lot of new data from the GPI and SOL reflectometer. Before going to the co vs. counter scan, we need to see whether 300kW is enough to have a measurable effect on the plasma. That will be the next shot.
Jan 26 2011 01:33:12:643PM	1110126017	Jerry Hughes	Shot 17: Attempt: Repeat with reduced LH power Result: Multiple H-modes, relatively high Prad. LH never fired. So, we have a control shot. No TS.
Jan 26 2011 01:42:45:880PM	1110126018	Jerry Hughes	Shot 18. Attempt: Repeat 16 with 300kW LH power. Result: Similar traces all around, except a faster Prad rise and a H-L transition at 0.85s. Discharge conditions at 1.3s are very similar to shot 016, except higher Prad, lower Tped.
Jan 26 2011 01:59:26:607PM	1110126019	Jerry Hughes	Shot 19. Attempt: Ne pulse delayed 50ms (MLR's suggestion). Also reduce LH power to 200kW, see whether any effect remains. Result: Not so pretty. 1st H-mode evolves the same way, radiating to a H-L. 2nd H-mode is not much better. Disrupts at 1.25s.
Jan 26 2011 02:13:28:510PM	1110126020	Jerry Hughes	Shot 20. Greg says 300kW is possible from the center columns, but it would take a few shots to work up to it. Based on the 200kW and 300kW results so far, I would not expect a strong payoff, assuming we accomplished this. So, for this shot, we will raise the LH power to the level it was at on shot 15. Result: More transient, radiative H-modes. LH is not so well behaved anymore. It only successfully injects power when we are in L-mode.
Jan 26 2011 02:35:03:127PM	1110126021	Jerry Hughes	Shot 21 Attempt: Change things up a little bit. Put in LH starting at 0.55s, pre-ICRF. Result: Not much better in terms of initial H-mode quality. Next: Ohmic-phase density has come down between shot 15 and now. Maybe it's time to push it up and see if we can't steady out the initial H-mode.
Jan 26 2011 02:42:20:990PM	1110126022	Jerry Hughes	Shot 22. Result: Shut down early due to runaways.
Jan 26 2011 03:05:16:050PM	1110126023	Jerry Hughes	Shot 23 Result: Multiple H-modes. Edge Te is pretty low, Prad high. Looking marginal to sustaining the H-mode at this level of Pnet. Next request more ICRF.
Jan 26 2011 03:22:55:790PM	1110126024	Jerry Hughes	Shot 24. Attempt: Repeat with more ICRF Result: That's better. After some initial transient H-modes, we have a steady EDA period with a density reduction, then a density rebuild after LH turns off.
Jan 26 2011 03:31:52:273PM	1110126025	Jerry Hughes	Shot 25: Attempt: Repeat shot 24, but put in some D-port power at 1.2s. Result: Dud
Jan 26 2011 03:51:06:857PM	1110126026	Jerry Hughes	Shot 26. Attempt: Repeat shot 24, but put in some D-port power at 1.2s. Result: Continuous H-mode from 0.68s to 1.5s! Almost 4MW of RF until 1.2s, then D-port injects 0.5MW. LH stays on during D-port pulse. Interestingly, the density starts to rise, when D-port turns on.
Jan 26 2011 04:06:14:727PM	1110126027	Jerry Hughes	Shot 27 Attempt: More RF from D Result: And LH doesn't mind! Density creeps up with D on still. Perhaps just outgassing? This makes things a little ambiguous, so turn off D for next shot. Next: Repeat shot 024 with Ip increased to 700kA.
Jan 26 2011 04:14:32:717PM	1110126028	Jerry Hughes	Shot 28: Attempt: Ip=700kA Result: Short H-mode (J-port faults and doesn't recover.) Next Yijun will try to keep J on. PO will put in a slight increase to the nl04 target.
Jan 26 2011 04:22:56:143PM	1110126029	Jerry Hughes	Shot 29. Result: Dud. 2nd one today.
Jan 26 2011 04:35:58:550PM	1110126030	Jerry Hughes	Shot 30. Result: Dud III
Jan 26 2011 05:28:03:560PM	1110126031	Jerry Hughes	Shot 31. Result: Shot ran. It has been discovered that the main fueling puff was He all day today, and not D2.

Physics Operator Comments
Jan 26 2011 09:33:13:367AM	1110126001	Syunichi Shiraiwa	Load 1101202030, PG1 and PG5 program modified. PG5 (H-buttom) Enabled Looks ok. PG5 was 0.05s instead of 0.1 s. Next : correct pg5 pulse length
Jan 26 2011 09:55:59:450AM	1110126002	Syunichi Shiraiwa	Looks Okey Next : fix GPC2 Te0
Jan 26 2011 10:08:06:947AM	1110126003	Syunichi Shiraiwa	Looks Okey Next : No change in PCS
Jan 26 2011 10:26:00:653AM	1110126004	Syunichi Shiraiwa	Something dropped from the top...?
Jan 26 2011 10:26:46:937AM	1110126005	Syunichi Shiraiwa	Appears to be same but plasma continued a little longer Something dropped from the top...?
Jan 26 2011 11:00:44:800AM	1110126007	Syunichi Shiraiwa	Full length. Clean H-mode
Jan 26 2011 11:05:44:680AM	1110126008	Syunichi Shiraiwa	Full length. Clean H-mode
Jan 26 2011 11:11:41:503AM	1110126008	Syunichi Shiraiwa	Good H-mod Next: PG5 voltage will be reduced from 70 to 40 V
Jan 26 2011 11:31:28:110AM	1110126009	Syunichi Shiraiwa	Good shot Next : move ZCUR upward by 1cm from 1.0s to 1.4s
Jan 26 2011 11:50:58:263AM	1110126010	Syunichi Shiraiwa	Disrupted during a ramp-up Next: retry
Jan 26 2011 11:59:47:733AM	1110126011	Syunichi Shiraiwa	Full length Next : Add Ninja puff and adjust ZCUR so that it stays the position at 1.25 s of shot 10. (ZCUR = -0.002)
Jan 26 2011 12:08:35:503PM	1110126012	Syunichi Shiraiwa	Soft ramp-down due to X-ray. Next : retry. ZCUR was made to be the same as shot 10 until 0.45s
Jan 26 2011 12:26:15:367PM	1110126013	Syunichi Shiraiwa	Full length. Entered the steady H-mode after LH. Next : Repeat with more ICRF
Jan 26 2011 12:34:56:400PM	1110126014	Syunichi Shiraiwa	Full length. Next : Raise Ne puff from 40V to 60V
Jan 26 2011 12:51:54:340PM	1110126015	Syunichi Shiraiwa	Full length Injection at 1.35s Next:
Jan 26 2011 12:54:03:943PM	1110126015	Syunichi Shiraiwa	Full length Injection at 1.35s Next: No change in PCS
Jan 26 2011 01:22:04:577PM	1110126017	Syunichi Shiraiwa	Full length, No LH
Jan 26 2011 01:47:00:743PM	1110126018	Syunichi Shiraiwa	LH ok this time. Next: Move PG5 by 50 ms later (from 0.4 to 0.5s)
Jan 26 2011 01:58:57:970PM	1110126019	Syunichi Shiraiwa	Disrupted at 1.25s Next:
Jan 26 2011 02:58:23:430PM	1110126022	Syunichi Shiraiwa	Shut down due to early disruption
Jan 26 2011 02:58:07:220PM	1110126023	Syunichi Shiraiwa	Full length
Jan 26 2011 03:58:48:440PM	1110126026	Syunichi Shiraiwa	Full length Next: No change in PCS
Jan 26 2011 04:03:16:077PM	1110126027	Syunichi Shiraiwa	Ok Next: Increase Ip to 700kA from 600kA
Jan 26 2011 04:14:36:703PM	1110126028	Syunichi Shiraiwa	LH/ICRF many trips. Next: Increase target density to 8e19, hoping H-mode improves the LH coupling too.
Jan 26 2011 04:26:47:047PM	1110126029	Syunichi Shiraiwa	Dud Next: Repeat

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:22:27:547AM	Plasma	Ok
2	09:38:06:617AM	Plasma	Ok
3	09:54:58:470AM	Plasma	Ok
4	10:09:45:487AM	Plasma	Ok
5	10:22:24:003AM	Plasma	Ok
6	10:34:54:323AM	Plasma	Ok
7	10:48:18:770AM	Plasma	Ok
8	11:02:30:623AM	Plasma	Ok
9	11:16:31:333AM	Plasma	Ok
10	11:31:10:480AM	Plasma	Ok
11	11:45:00:373AM	Plasma	Ok
12	11:59:05:653AM	Plasma	Ok
13	12:11:53:727PM	Plasma	Ok
14	12:25:55:377PM	Plasma	Ok
15	12:39:40:343PM	Plasma	Ok
16	12:59:39:663PM	Plasma	Ok
17	01:14:27:180PM	Plasma	Ok
18	01:33:11:940PM	Plasma	Ok
19	01:51:49:367PM	Plasma	Ok
20	02:07:35:590PM	Plasma	Ok
21	02:23:20:417PM	Plasma	Ok
22	02:38:24:260PM	Plasma	Ok
23	02:53:56:397PM	Plasma	Ok
24	03:08:38:147PM	Plasma	Ok
25	03:23:16:383PM	Plasma	Ok
26	03:36:29:160PM	Plasma	Ok
27	03:50:03:097PM	Plasma	Ok
28	04:04:43:267PM	Plasma	Ok
29	04:18:32:647PM	Plasma	Ok
30	04:32:04:283PM	Plasma	Ok
31	04:50:51:220PM	Plasma	Ok