Alcator C-Mod Run 1101210 Information

Miniproposals

Miniproposal: 575

Date Filed: 8/28/2009

Title: ITER-like Discharge Rampdown Studies

First Author: Chuck Kessel

Session Leader: Chuck Kessel (shots 1-31)

Operators
Session leader(s):	Chuck Kessel
Physics operator(s):	Ian Hutchinson
Engineering operator(s):	Sam Pierson,Gary Dekow,Bill Byford

Engineering Operator Run Comment
Alcator C-Mod Run 1101210

Session Leader Plans

Entered: Dec 10 2010 07:59:29:133AM

Author: Chuck Kessel

4.1 Machine and Plasma Parameters

Give values or range for:

Toroidal Field: 5.4 T
Plasma Current: 1.35 MA
Working Gas Species: D
Density: flattop H-mode density range 2.5 x 1020 m-2, variable (cryopump not precluded).

4.2 Auxiliary Systems

ICRF Power, pulse length, phasing: up to 4 MW, 2 s duration
LHCD Power, pulse length, phasing: no
Pellet Injection (species): no
Impurity blow-off injection: no
Diagnostic Neutral Beam: Highly desirable
Special gas puffing: NINJA (with D2) should be available.
Non-axisymmetric Coils (Connections, Current); Yes; optimized to reduce locked modes.
Other: boronization required

4.3 Diagnostics
List required diagnostics, and any special setup or configuration, e.g. non-standard digitization rate.

Essential: Thomson, Magnetics, Hard x-rays, ECE, TCI.
Desirable: MSE, CXRS, Hirex, SOL probes.

RUN PLAN: (we are not doing the strike point control!)
Recover discharge 1091006002, all were 750 ms rampdown times (500 ms Ip rampup t=0-500 ms, 700 ms flattop t=500-1200 ms, 750 ms rampdown t=1200-1950 ms)
This includes midplane coupling (vertically centered in front of ICRF launcher) with kappa reduction.
The plasma must begin the rampdown from an H-mode flattop state with EDA H-mode, rampdown times of 0.5 and 1.25 s.
--�?? ICRF power will be varied to access EDA H-mode
---> we are trying to establish rampdown discharges with different H-L transition times, for 2 Ip rampdown rates

· establish ohmic discharge with 0.5 s rampdown time
· establish H-mode in flattop with 0.5 s rampdown time, inject ICRF power 2-3 MW at 0.7 s
· 0.5 s rampdown, all power off at end of flattop
· 0.5 s rampdown, 1 MW ICRF heating fixed
· 0.5 s rampdown, 2 MW ICRF heating fixed to half way down then go to 1 MW

· establish ohmic discharge with 1.25 s rampdown time
· establish H-mode in flattop with 1.25 s rampdown time, inject ICRF power 2-3 MW at 0.7 s
· 1.25 s rampdown, all power off at end of flattop
· 1.25 s rampdown, 1 MW ICRF heating fixed
· 1.25 s rampdown, 2 MW ICRF heating fixed to half way down then go to 1 MW

Physics Operators Plans

Entered: Dec 9 2010 01:52:32:120PM

Author: Ian Hutchinson

********************************************************************************
Overnight boronization. Procedure as Per SMW
------------------------------
Boronization Parameters as for 1101130
------------------------------
dP=120 psi
** optimized sweep parameters **
rmin/rdwell/rmax: 44/75/80 cm
tdwell/tsweep: 60/120 s
Zero EF4 current
Pulser 0.7 on 0.3 off
----------------------------------
Post-boronization ECDC parameters:
----------------------------------
* Note: using He only *
----------------------
1st Gas Setup
Gas: He
sweep: 44/45/103 cm
scan: 20/120 s
Pressure: 5e-5 Torr
Duration: 3 hrs
*********************************************************
Note: If there are problems with helium ecdc staying on
with these parameters, I suggest the following steps:
1) Try either purging and refilling the B-top plenum with Helium
or running directly off the Helium bottle
2) Try raising the pressure set point to 1e-4 Torr
3) Try changing sweep to avoid going out on inner wall,
such as 45/46/103 cm, or to avoid going out at outer limit,
such as changing max value from 103 to 100cm
*********************************************************

Engineering Setup as per shot 1091006002.
Note: this is an early diversion shot with an early (but slow) ramp-down.

Session Leader Summaries

Entered: Dec 10 2010 11:04:54:423AM

Author: Amanda Hubbard

Strong cutoff, right into central GPC channel, in H-modes.

Entered: Dec 10 2010 05:13:15:490PM

Author: Chuck Kessel

MP575 ITER-like rampdown studies

Super run day, lots of good shots, long EDA H-modes into rampdown
2 Ip rampdown times (from 1.35 MA) 0.5s and 1.25 (actual 1.0 s)
ICRF powers in flattop to get EDA was 1.25 MW
higher power made ELM-free, injections, and higher prad in flattop
various powers in the rampdown from 0 to 0.75 to 1.5-0.75 MW

stored energies dropping faster than Ip
densities drop with Ip

faster Ip ramps make these drops faster, and visa versa

q95 between 3 and 3.25

nl04's up to 2.8e20 in EDA H-mode

do we need ICRF in the rampdown for the best behavior, seems like it

tried Ar to time H to L transition, but no luck

008-016 are 500 ms rampdown time
017-031 are 1000 ms rampdown time

lots of feedback control/discharge setup work, thanks Ian and Steve

Physics Operator Summaries

Entered: Dec 10 2010 05:08:14:010PM

Author: Ian Hutchinson

Physop Summary.
---------------

Using the controlled ramp-up (early crowbar, early diversion)
programming, it took 4 shots to fix the vertical instability in the
vicinity of .1s. This was mostly caused by the plasma being too far
in, and was fixed by programming the rcur further out. Thereafter
various clean-up adjustments to this scenario were added.

The required rampdowns in 0.5 and 1.2(5)s were obtained fairly
straightforwardly. At the end of the long-rampdown shots the plasma
shape is very bad because of current limits in EF1 (mostly). But it
proved possible to avoid OH2 current limits by accelerating the ramp
down in the last one third, which naturally reduces total flux
consumption. Nevertheless the shape control does not work well in the
long rampdowns and I don't completely understand why. Even so it
proved possible to attain final currents of about 100kA at which we
are well over the Greenwald limit.

There is another vertical excursion at .2s that we don't understand,
but it never caused a disruption.

We had 25 1.3MA plasmas only one of which disrupted at current higher
than 0.5MA (in ramp up or down).

Sustained H-modes in ramp-down were achieved remarkably well.

Score-Card
----------

Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result | 01 0.089 0.326 Plasma | 02 0.113 0.403 Plasma | | 03 0.110 0.396 Plasma | 04 0.098 0.350 Plasma | | 05 1.927 1.284 Plasma | 06 1.273 1.284 Plasma | | 07 1.927 1.290 Plasma | 08 1.736 1.289 Plasma | | 09 1.736 1.287 Plasma | 10 1.738 1.288 Plasma | | 11 1.737 1.284 Plasma | 12 0.049 0.147 Plasma | | 13 1.747 1.288 Plasma | 14 1.740 1.286 Plasma | | 15 1.728 1.286 Plasma | 16 1.605 1.287 Plasma | | 17 2.220 1.283 Plasma | 18 2.191 1.286 Plasma | | 19 2.070 1.285 Plasma | 20 0.000 0.029 Dud | | 21 2.060 1.286 Plasma | 22 2.080 1.286 Plasma | | 23 2.130 1.288 Plasma | 24 2.150 1.286 Plasma | | 25 2.170 1.286 Plasma | 26 2.169 1.282 Plasma | | 27 2.154 1.292 Plasma | 28 2.165 1.289 Plasma | | 29 2.160 1.287 Plasma | 30 2.178 1.290 Plasma | | 31 2.175 1.284 Plasma Date 1101210: 31 shots. 30 plasmas. 0 fizzles. 1 duds. 0 System Error. (Plasma = Ip gt 60.0 kA Dud = H_alpha lt 0.40 V) Total plasma duration: 49.43 s (exceeding -32 kA)

Session Leader Comments

Dec 10 2010 10:55:26:473AM 1101210007 Chuck Kessel shot all the way thru, H-mode near start of rampdown, ICRF at 1.5 MW in flattop - off at beginning of rampdown, q95 good, kappa reduced somewhat to help with vertical stab
750 ms rampdown, switching to 500 ms rampdown

Dec 10 2010 11:35:47:200AM 1101210010 Chuck Kessel new faster rampdown 500 ms, EDA onset in flattop with PICRF=1.25 MW, lasting into rampdown, great discharges q95 is 3-3.2

Dec 10 2010 11:48:43:763AM 1101210011 Chuck Kessel new faster rampdown 500 ms, trying ICRF power in rampdown 0.75 MW, stepped down from flattop power 1.25 MW, late H-mode, but otherwise a long EDA H-mode in rampdown

Dec 10 2010 12:50:17:470PM 1101210014 Chuck Kessel 500 ms rampdown, ICRF stays at 1.25 MW into rampdown partway, then drop to 0.75MW, good long EDA H-mode in rampdown shot

Dec 10 2010 12:51:31:180PM 1101210015 Chuck Kessel 500 ms rampdown, trying to get H-L transition at beginning of rampdown, using Argon and ICRF shutoff, didn't quite work.....try little earlier ICRF shutoff nd higher Ar

Dec 10 2010 01:38:49:403PM 1101210018 Chuck Kessel 1250 ms rampdown, Ip down to 250 kA, ohmic case (017) and ICRF (018), get H-mode in flattop, and 2nd one in rampdown, trying to get several systems setup with longer rampdown timing

Dec 10 2010 03:12:43:500PM 1101210022 Chuck Kessel 1250 ms rampdown, Ip down to 400 kA, ending at 2.1 s, ICRF from 1.25 MW in flattop to 0.75 MW in rampdown, good long H-modes in rampdown

Dec 10 2010 03:15:09:510PM 1101210024 Chuck Kessel 1250 ms rampdown, Ip down to 150 kA, ending at 2.15 s, slightly faster Ip ramp at end is working well, ICRF from 1.25 MW in flattop to 0 at end of flattop, late H-mode and early H-L

Dec 10 2010 04:30:59:783PM 1101210027 Chuck Kessel 1250 ms rampdown, Ip down to 150 kA, ending at 2.15 s, raise ICRF power in flattop to 1.5 MW, got earier H-mode

Dec 10 2010 04:32:32:183PM 1101210028 Chuck Kessel same as 027, stepdown ICRF from 1.5 MW in flattop to 0.75 MW in rampdown, very long H-mode to 1.95 s

Physics Operator Comments

Dec 10 2010 08:56:22:747AM Ian Hutchinson Load from 1091006002. No messages came up.
Bring up All-Vs for seg 1 and seg 2.
At the segment switch, add a point in seg 2 (80ms) with value equal to that
of seg 1 at the same time:
OH1: 250V
OH2U/L +10V
EF1U/L -110V
EF2U/L 95V (Also copy U->L since they seem to be different.
EF3 1330V

The fill gas puff is 20ms. Leave.
Load
Add point in zcur at 80ms -.0017 seg 2 to avoid discontinuity.
Load

Dec 10 2010 09:25:28:820AM 1101210001 Ian Hutchinson Plasma loses vertical control at segment switch. OH2U current ramps up quickly.
The plasma moves up.

Set seg 1 fast zcur gain to 3P, 3D at 60ms.

Dec 10 2010 09:37:14:537AM 1101210002 Ian Hutchinson Plasma to .1s got through the seg switch, but still unstable.
Click in dpcs_xjump and piezo_chopper.

Set clearin to +0.005 instead of .015 in seg 2.
Load.

Dec 10 2010 09:53:30:150AM 1101210003 Ian Hutchinson Same.

Reduce Ip gain in seg 2 to 2 from 4 at 80ms.
Load

Dec 10 2010 10:08:06:560AM 1101210004 Ian Hutchinson Slightly worse.

Rcur to .67 at 80ms seg 1. To .67 (from .662) in seg 2.
Load.

Dec 10 2010 10:23:01:900AM 1101210005 Ian Hutchinson Plasma to rampdown.

OH2 voltages to 8V at 70ms from 5V, back off on elongation a bit.
Rcur to .675 at 80ms. (from .67)
Increase fill puff to 23ms.
Add ICRF.

Dec 10 2010 10:39:51:663AM 1101210006 Ian Hutchinson Plasma to 1.3s

Clearin to .004 from .007 at >1s

Dec 10 2010 10:56:12:167AM 1101210007 Ian Hutchinson Plasma. In H-mode during rampdown.

Change to .5s rampdown.
Ip
ZXL
RXU
ZXU keep a bit higher to avoid upper null.
Load.

Dec 10 2010 11:09:19:617AM 1101210008 Ian Hutchinson Plasma to rampdown.

Program zcur to ramp to -.01 at end to control late upward motion.
Load.

Dec 10 2010 11:24:01:877AM 1101210009 Ian Hutchinson Plasma to rampdown.

Install a multistep Ip gain ramp at segment switch.

Dec 10 2010 11:48:05:387AM 1101210010 Ian Hutchinson Plasma to rampdown. H-mode in rampdown as required.

Make the Ip drawn identical for seg 1 and seg2 at points .04 and .1s.

Dec 10 2010 11:50:21:103AM 1101210011 Ian Hutchinson Plasma to rampdown. Enters H-mode at start of rampdown.

Dec 10 2010 12:10:15:780PM 1101210012 Ian Hutchinson Terminates at 40ms due to big radiative event, that appears to be associated
with the plasma being rather far inside (c.f. other shots). Perhaps the current
rise is a bit slower. There are a couple of early bounces.

Match Rcur derivative gain across gain switch.
Set ICEF4 to -1300 from -1310A.
Load.

Dec 10 2010 12:18:48:393PM 1101210013 Ian Hutchinson Plasma to rampdown.

Add point at zero to the Br gain trace at the end.
Delay zcur integral gain turn on to .095s, was ~.07

Dec 10 2010 12:43:24:627PM 1101210014 Ian Hutchinson Plasma to rampdown. Moving the integral gain did not do much.

Add seg 1 fast zcur gain point at 60ms 3.5. Note the seg 2 gain is 5 (D3.5). So this gain switch might be significant.

Fill Ar in B-side bottom. In addition to 30m at .3s, 50ms at 1s.
Load
Draw the zcur lower still in the end of rampdown.

Dec 10 2010 12:53:58:343PM 1101210015 Ian Hutchinson Plasma to rampdown.
The change to the fast zcur gain in seg1 has substantially reduced the excursion
induced by the seg switch. Therefore we can identify the zcur excursion as the
change in the _fast_ zcur gain at the seg switch. As a point of principle.
Draw the gains so that they are equal at seg switch, and put the gain changes
elsewhere.

Draw late zcur even lower.
Increase Ar puffs to 50ms, 100ms.
Match fast zcur gains at 4 across the seg switch.
Load

Dec 10 2010 01:25:33:767PM 1101210016 Ian Hutchinson Plasma to rampdown. Disrupts in rampdown at about 400kA probably because of the
Ar.

Turn off second Ar puff. Make first 40ms.

Make Ip ramp till 2.5s
Make integrators till 2.5s
Go through all the wires and extend gains to 2.5s

Dec 10 2010 01:36:09:083PM 1101210017 Ian Hutchinson Plasma disrupts at 2.25s. Pretty good.

Lower ICEF4 gain to 1 from 2 at end.

Dec 10 2010 01:57:20:897PM 1101210018 Ian Hutchinson Plasma. Same. Ef2s still turn off and then disruption.

Draw EF4 to -3000.
Draw Ip ramp faster after 2s.

Dec 10 2010 02:08:08:237PM 1101210019 Ian Hutchinson Plasma disrupts slightly earlier in ramp down.

Disable Ar.
Draw Rcur to .45 at .01s instead of .5 to try to increase the initial Bzramp.

Dec 10 2010 02:25:36:993PM 1101210020 Ian Hutchinson PS Dud. EF1U commutated early (charging through the resistor.) OH2s also imbalanced.

Dec 10 2010 02:37:13:753PM 1101210021 Ian Hutchinson Plasma with H-mode

Drop clearin to zero at 2.2s
Draw rcur rising toward shot end to compensate drift.

Dec 10 2010 02:53:00:103PM 1101210022 Ian Hutchinson Plasma to rampdown.

Draw out the OH1V trace to 2.5V it was terminating subtantially earlier and
that might be a cause of our rcur problem.

Dec 10 2010 03:10:46:570PM 1101210023 Ian Hutchinson Plasma.

Increase ICEF4 gain back to 2. It is now drawn more negative.

Dec 10 2010 03:22:08:453PM 1101210024 Ian Hutchinson Plasma.

Draw TF flat top out to 2.25s
Drop RXU/L to 0 and reduce their gains to 1 at 2s.

Dec 10 2010 03:43:42:270PM 1101210025 Ian Hutchinson Plasma till 2.16s.

Hold OH1V up till 2.5s
Load.

Dec 10 2010 03:57:32:790PM 1101210026 Ian Hutchinson Plasma. Same.

Rcur drawn to .55 at 10ms.

Dec 10 2010 04:21:26:543PM 1101210027 Ian Hutchinson Plasma.

Rcur drawn to 4 at 10ms.

Dec 10 2010 04:33:43:990PM 1101210028 Ian Hutchinson Plasma.

Dec 10 2010 04:43:13:647PM 1101210029 Ian Hutchinson Plasma.

Dec 10 2010 05:07:39:370PM 1101210030 Ian Hutchinson Plasma.

Dec 10 2010 05:07:49:540PM 1101210031 Ian Hutchinson Plasma.

Engineering Operator Comments

Shot Time Type Status Comment

1 08:58:28:757AM Plasma Ok

2 09:20:17:243AM Plasma Ok

3 09:35:35:303AM Plasma Ok

4 09:51:19:300AM Plasma Ok

5 10:06:07:267AM Plasma Ok

6 10:20:59:997AM Plasma Ok

7 10:37:25:370AM Plasma Ok

8 10:54:12:270AM Plasma Ok

9 11:07:25:873AM Plasma Ok

10 11:21:49:050AM Plasma Ok

11 11:35:56:393AM Plasma Ok

12 11:49:16:447AM Plasma Ok

13 12:02:08:370PM Plasma Ok

14 12:16:52:230PM Plasma Ok

15 12:38:00:313PM Plasma Ok

16 12:52:06:200PM Plasma Ok

17 01:14:21:273PM Plasma Ok

18 01:30:20:500PM Plasma Ok

19 01:48:48:623PM Plasma Ok

20 02:05:08:360PM Plasma Bad EF1U Commutated Early

21 02:17:32:103PM Plasma Ok

22 02:31:23:667PM Plasma Ok

23 02:50:05:053PM Plasma Ok

24 03:04:16:937PM Plasma Ok

25 03:20:16:767PM Plasma Ok

26 03:37:17:937PM Plasma Ok

27 03:55:22:697PM Plasma Ok

28 04:12:17:383PM Plasma Ok

29 04:30:57:520PM Plasma Ok

30 04:46:23:100PM Plasma Ok

31 05:02:35:677PM Plasma Ok

System Availability

Dec 10 2010 08:58:10:390AM

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 are still not available. Jul 22 2010 08:41AM (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 differential phase (profile) working since 8/27/2010. full phase (fluctuations + profile) is not. If put on a miniproposal, please request LH launcher to be moved in Oct 05 2010 11:26AM (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 no Down due to broken laser shutter. Nov 22 2010 10:44AM (ntsujii) Miklos Porkolab Phase Contrast Imaging arai,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 Operational. Raw spectra stored but not line brightness time histories are going into the tree yet. Aug 24 2010 09:17AM (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
Dec 10 2010 10:55:26:473AM	1101210007	Chuck Kessel	shot all the way thru, H-mode near start of rampdown, ICRF at 1.5 MW in flattop - off at beginning of rampdown, q95 good, kappa reduced somewhat to help with vertical stab 750 ms rampdown, switching to 500 ms rampdown
Dec 10 2010 11:35:47:200AM	1101210010	Chuck Kessel	new faster rampdown 500 ms, EDA onset in flattop with PICRF=1.25 MW, lasting into rampdown, great discharges q95 is 3-3.2
Dec 10 2010 11:48:43:763AM	1101210011	Chuck Kessel	new faster rampdown 500 ms, trying ICRF power in rampdown 0.75 MW, stepped down from flattop power 1.25 MW, late H-mode, but otherwise a long EDA H-mode in rampdown
Dec 10 2010 12:50:17:470PM	1101210014	Chuck Kessel	500 ms rampdown, ICRF stays at 1.25 MW into rampdown partway, then drop to 0.75MW, good long EDA H-mode in rampdown shot
Dec 10 2010 12:51:31:180PM	1101210015	Chuck Kessel	500 ms rampdown, trying to get H-L transition at beginning of rampdown, using Argon and ICRF shutoff, didn't quite work.....try little earlier ICRF shutoff nd higher Ar
Dec 10 2010 01:38:49:403PM	1101210018	Chuck Kessel	1250 ms rampdown, Ip down to 250 kA, ohmic case (017) and ICRF (018), get H-mode in flattop, and 2nd one in rampdown, trying to get several systems setup with longer rampdown timing
Dec 10 2010 03:12:43:500PM	1101210022	Chuck Kessel	1250 ms rampdown, Ip down to 400 kA, ending at 2.1 s, ICRF from 1.25 MW in flattop to 0.75 MW in rampdown, good long H-modes in rampdown
Dec 10 2010 03:15:09:510PM	1101210024	Chuck Kessel	1250 ms rampdown, Ip down to 150 kA, ending at 2.15 s, slightly faster Ip ramp at end is working well, ICRF from 1.25 MW in flattop to 0 at end of flattop, late H-mode and early H-L
Dec 10 2010 04:30:59:783PM	1101210027	Chuck Kessel	1250 ms rampdown, Ip down to 150 kA, ending at 2.15 s, raise ICRF power in flattop to 1.5 MW, got earier H-mode
Dec 10 2010 04:32:32:183PM	1101210028	Chuck Kessel	same as 027, stepdown ICRF from 1.5 MW in flattop to 0.75 MW in rampdown, very long H-mode to 1.95 s

Physics Operator Comments
Dec 10 2010 08:56:22:747AM		Ian Hutchinson	Load from 1091006002. No messages came up. Bring up All-Vs for seg 1 and seg 2. At the segment switch, add a point in seg 2 (80ms) with value equal to that of seg 1 at the same time: OH1: 250V OH2U/L +10V EF1U/L -110V EF2U/L 95V (Also copy U->L since they seem to be different. EF3 1330V The fill gas puff is 20ms. Leave. Load Add point in zcur at 80ms -.0017 seg 2 to avoid discontinuity. Load
Dec 10 2010 09:25:28:820AM	1101210001	Ian Hutchinson	Plasma loses vertical control at segment switch. OH2U current ramps up quickly. The plasma moves up. Set seg 1 fast zcur gain to 3P, 3D at 60ms.
Dec 10 2010 09:37:14:537AM	1101210002	Ian Hutchinson	Plasma to .1s got through the seg switch, but still unstable. Click in dpcs_xjump and piezo_chopper. Set clearin to +0.005 instead of .015 in seg 2. Load.
Dec 10 2010 09:53:30:150AM	1101210003	Ian Hutchinson	Same. Reduce Ip gain in seg 2 to 2 from 4 at 80ms. Load
Dec 10 2010 10:08:06:560AM	1101210004	Ian Hutchinson	Slightly worse. Rcur to .67 at 80ms seg 1. To .67 (from .662) in seg 2. Load.
Dec 10 2010 10:23:01:900AM	1101210005	Ian Hutchinson	Plasma to rampdown. OH2 voltages to 8V at 70ms from 5V, back off on elongation a bit. Rcur to .675 at 80ms. (from .67) Increase fill puff to 23ms. Add ICRF.
Dec 10 2010 10:39:51:663AM	1101210006	Ian Hutchinson	Plasma to 1.3s Clearin to .004 from .007 at >1s
Dec 10 2010 10:56:12:167AM	1101210007	Ian Hutchinson	Plasma. In H-mode during rampdown. Change to .5s rampdown. Ip ZXL RXU ZXU keep a bit higher to avoid upper null. Load.
Dec 10 2010 11:09:19:617AM	1101210008	Ian Hutchinson	Plasma to rampdown. Program zcur to ramp to -.01 at end to control late upward motion. Load.
Dec 10 2010 11:24:01:877AM	1101210009	Ian Hutchinson	Plasma to rampdown. Install a multistep Ip gain ramp at segment switch.
Dec 10 2010 11:48:05:387AM	1101210010	Ian Hutchinson	Plasma to rampdown. H-mode in rampdown as required. Make the Ip drawn identical for seg 1 and seg2 at points .04 and .1s.
Dec 10 2010 11:50:21:103AM	1101210011	Ian Hutchinson	Plasma to rampdown. Enters H-mode at start of rampdown.
Dec 10 2010 12:10:15:780PM	1101210012	Ian Hutchinson	Terminates at 40ms due to big radiative event, that appears to be associated with the plasma being rather far inside (c.f. other shots). Perhaps the current rise is a bit slower. There are a couple of early bounces. Match Rcur derivative gain across gain switch. Set ICEF4 to -1300 from -1310A. Load.
Dec 10 2010 12:18:48:393PM	1101210013	Ian Hutchinson	Plasma to rampdown. Add point at zero to the Br gain trace at the end. Delay zcur integral gain turn on to .095s, was ~.07
Dec 10 2010 12:43:24:627PM	1101210014	Ian Hutchinson	Plasma to rampdown. Moving the integral gain did not do much. Add seg 1 fast zcur gain point at 60ms 3.5. Note the seg 2 gain is 5 (D3.5). So this gain switch might be significant. Fill Ar in B-side bottom. In addition to 30m at .3s, 50ms at 1s. Load Draw the zcur lower still in the end of rampdown.
Dec 10 2010 12:53:58:343PM	1101210015	Ian Hutchinson	Plasma to rampdown. The change to the fast zcur gain in seg1 has substantially reduced the excursion induced by the seg switch. Therefore we can identify the zcur excursion as the change in the _fast_ zcur gain at the seg switch. As a point of principle. Draw the gains so that they are equal at seg switch, and put the gain changes elsewhere. Draw late zcur even lower. Increase Ar puffs to 50ms, 100ms. Match fast zcur gains at 4 across the seg switch. Load
Dec 10 2010 01:25:33:767PM	1101210016	Ian Hutchinson	Plasma to rampdown. Disrupts in rampdown at about 400kA probably because of the Ar. Turn off second Ar puff. Make first 40ms. Make Ip ramp till 2.5s Make integrators till 2.5s Go through all the wires and extend gains to 2.5s
Dec 10 2010 01:36:09:083PM	1101210017	Ian Hutchinson	Plasma disrupts at 2.25s. Pretty good. Lower ICEF4 gain to 1 from 2 at end.
Dec 10 2010 01:57:20:897PM	1101210018	Ian Hutchinson	Plasma. Same. Ef2s still turn off and then disruption. Draw EF4 to -3000. Draw Ip ramp faster after 2s.
Dec 10 2010 02:08:08:237PM	1101210019	Ian Hutchinson	Plasma disrupts slightly earlier in ramp down. Disable Ar. Draw Rcur to .45 at .01s instead of .5 to try to increase the initial Bzramp.
Dec 10 2010 02:25:36:993PM	1101210020	Ian Hutchinson	PS Dud. EF1U commutated early (charging through the resistor.) OH2s also imbalanced.
Dec 10 2010 02:37:13:753PM	1101210021	Ian Hutchinson	Plasma with H-mode Drop clearin to zero at 2.2s Draw rcur rising toward shot end to compensate drift.
Dec 10 2010 02:53:00:103PM	1101210022	Ian Hutchinson	Plasma to rampdown. Draw out the OH1V trace to 2.5V it was terminating subtantially earlier and that might be a cause of our rcur problem.
Dec 10 2010 03:10:46:570PM	1101210023	Ian Hutchinson	Plasma. Increase ICEF4 gain back to 2. It is now drawn more negative.
Dec 10 2010 03:22:08:453PM	1101210024	Ian Hutchinson	Plasma. Draw TF flat top out to 2.25s Drop RXU/L to 0 and reduce their gains to 1 at 2s.
Dec 10 2010 03:43:42:270PM	1101210025	Ian Hutchinson	Plasma till 2.16s. Hold OH1V up till 2.5s Load.
Dec 10 2010 03:57:32:790PM	1101210026	Ian Hutchinson	Plasma. Same. Rcur drawn to .55 at 10ms.
Dec 10 2010 04:21:26:543PM	1101210027	Ian Hutchinson	Plasma. Rcur drawn to 4 at 10ms.
Dec 10 2010 04:33:43:990PM	1101210028	Ian Hutchinson	Plasma.
Dec 10 2010 04:43:13:647PM	1101210029	Ian Hutchinson	Plasma.
Dec 10 2010 05:07:39:370PM	1101210030	Ian Hutchinson	Plasma.
Dec 10 2010 05:07:49:540PM	1101210031	Ian Hutchinson	Plasma.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:58:28:757AM	Plasma	Ok
2	09:20:17:243AM	Plasma	Ok
3	09:35:35:303AM	Plasma	Ok
4	09:51:19:300AM	Plasma	Ok
5	10:06:07:267AM	Plasma	Ok
6	10:20:59:997AM	Plasma	Ok
7	10:37:25:370AM	Plasma	Ok
8	10:54:12:270AM	Plasma	Ok
9	11:07:25:873AM	Plasma	Ok
10	11:21:49:050AM	Plasma	Ok
11	11:35:56:393AM	Plasma	Ok
12	11:49:16:447AM	Plasma	Ok
13	12:02:08:370PM	Plasma	Ok
14	12:16:52:230PM	Plasma	Ok
15	12:38:00:313PM	Plasma	Ok
16	12:52:06:200PM	Plasma	Ok
17	01:14:21:273PM	Plasma	Ok
18	01:30:20:500PM	Plasma	Ok
19	01:48:48:623PM	Plasma	Ok
20	02:05:08:360PM	Plasma	Bad	EF1U Commutated Early
21	02:17:32:103PM	Plasma	Ok
22	02:31:23:667PM	Plasma	Ok
23	02:50:05:053PM	Plasma	Ok
24	03:04:16:937PM	Plasma	Ok
25	03:20:16:767PM	Plasma	Ok
26	03:37:17:937PM	Plasma	Ok
27	03:55:22:697PM	Plasma	Ok
28	04:12:17:383PM	Plasma	Ok
29	04:30:57:520PM	Plasma	Ok
30	04:46:23:100PM	Plasma	Ok
31	05:02:35:677PM	Plasma	Ok