Miniproposals

Miniproposal: 673 Date Filed: 11/9/2011 Title: Study of L-H transition and H-mode at low plasma density with improved C-Mod diagnostics First Author: Yunxing Ma Session Leader: Yunxing Ma (shots 1-34)

Engineering Operator Run Comment

MP 673, Study of L-H transition and H-mode at low plasma density with im

Session Leader Plans

Entered: Feb 22 2012 04:27:01:463PM

Author: Yunxing Ma

Run plan for MP673 (02/23/2012) ================================================== Purpose: The primary objective of this experiment is two-fold: (1) studying the plasma density dependence of divertor geometry effect on H-mode threshold power and plasma behaviors close to L-H transition in (2) characterizing the density and divertor geometry dependence of GAM-like low-frequency (~3KHz) plasma fluctuation preceding and near the onset of L-H transition. ********************************************* ********************************************* Machine Operation Parameters: Gas: D2 Bt/Ip: 5.4T/1.0MA L-mode target nl04 (10^20m^-2): 0.35-0.45, 0.7-0.8, 1.1-1.2 ICRF: up to ~3.0MW Cryopump: on ********************************************** ********************************************** Diagnostics Requirement: Profiles: TS (edge+core), ECE (GPC1, GPC2, FRC), Hirex (Ar), CXRS (providing DNB working), X-mode reflectometry, divertor probes, Ly edge Fluctuations: O-mode reflectometry (in particular 50~88GHz), magnetic coils, PCI, GPI (providing J.Terry on site) ********************************************** ********************************************** Shot Sequence (20~24 shots): Part 1, nl04~0.35 (8~10 shots): Load target shot from 1120209012: nl04~0.35, Bt=5.3T, Ip=1MA, vertical-plate divertor, Prf implemented at 0.6s and linearly ramped up to ~3.0MW before terminated at 1.4s. After the target shot is successfully repeated, the run will proceed to develop H-mode at low density (nl04~0.4) with slot divertor geometry. Based on experience gained from previous experiments, this magnetic configuration can be realized by decreasing (2~3cm) RXL and/or ZXL while maintaining the shaping (elongation, triangularity, etc) nearly fixed. The phys op may reference the magnetic geometry of shot 1101221012 to get some direction. To ensure the maximum likelihood of H-mode access, the same RF wave form as of the target shot (1120209012) will be used (ramp-up to ~3.0MW). One major foreseen difficulty based on what we encountered in the past, is how to maintain the strike point in the slot through the discharge to before L-H transition, while the RF power is continuously raised and the flux swing tend to move the strike point up to the vertical plate. Considering the potential impedance, it might take a few (2~3) discharges to successfully establish this scenario. After a low density L-H transition with slot divertor is successfully produced and repeated, the session leader will evaluate the threshold power. The next stage then is to iterate between vertical-plate and slot divertor for 4~6 shots to collect sufficient (statistically meaningful) plasma data from various C-Mod diagnostics. If necessary, the RF wave form may be programmed in staircase close to Pth for each divertor geometry to optimize the diagnostics performance. Approximately 3~5 shots are aimed in each divertor geometry by the end of this part (6~10 shots in total). Part 3, nl04~1.1 (6~8 shots): Increase target density to nl04~1.1 and repeat part 1. Part 4, nl04~0.8 (~6 shots): set target density to nl04~0.8 and repeat part 1.

Physics Operators Plans

Entered: Feb 22 2012 05:38:34:893PM

Author: Earl Marmar

PO Plan for Thursday, Feb 23, 2012 MP 673, Study of L-H transition and H-mode at low plasma density with improved C-Mod diagnostics SL Y. Ma PO E. Marmar ----------------- Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 Power systems as on: 1120209012 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 enabled (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 10 psi D2 DISABLED Enable gate-valves and shutters: ECE, VUV, HiREX Sr, Xeus Leave z-bolo shutter as is (should be open) Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): yes ICRF(yes/no): yes (3MW all antennas at 78 or 80 MHz) LH(yes/no): no Cryopump (yes/no): yes DNB (yes/no): no Vessel temperature: 35/35/35 ------------------------------ ECDC Parameters ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s

Session Leader Summaries

Entered: Feb 23 2012 06:22:32:830PM

Author: Yunxing Ma

Today's run went faily well despite many fizzles and disruptions in the first 2/3 of the expreriment. Totally 17 plasmas were produced, 14 of them have clear L-H transition in the Ip flattop. Most of the transitions were realized with the slot divertor, and cover a reasonably broad density range of 0.8~2.2n20. The run has reproduced the earlier observation of H-mode threshold power reduction in slot divertor operation at moderate- to high-density, while it seems at low density, the H-mode threshold power with slot divertor could be similar to the value with vertical-plate divertor operation. More analysis will be carried out.

Physics Operator Summaries

Session Leader Comments
Feb 23 2012 08:59:58:030AM	1120223001	Yunxing Ma	shot 1: load target shot 1120209012, and repeat it
Feb 23 2012 09:13:32:450AM	1120223001	Yunxing Ma	Good shot and clear L-H transition at 0.845sec. Strike point on the vertical divertor at transition. nebar at transition~1.0n20, slightly higher than the target shot, but still in the low-density regime
Feb 23 2012 09:28:14:360AM	1120223002	Yunxing Ma	clear L-h transition at 1.104sec, density at transition higher with nl04~0.6 the strike point is kind on the lowest tile of the vertical divertor at transition, close to the slot but not in. Next shot, try recuding RXL by 0.5cm, reducing ZXL by 0.5cm.
Feb 23 2012 11:26:23:687AM	1120223003	Yunxing Ma	Good shot, H-mode transition at 1.255sec, nebar~1.0n20, strike point curl up to hit the bottom tile on vertical divertor plate before L-H while maintained reasaonably long in slot beforehand
Feb 23 2012 11:26:59:167AM	1120223004	Yunxing Ma	Good shot, H-mode transition at 1.317sec, nebar~1.0n20, strike point curl up to hit the bottom tile on vertical divertor plate before L-H while maintained reasaonably long in slot beforehand
Feb 23 2012 11:31:23:373AM	1120223005	Yunxing Ma	Increase the initial RF power to 2MW, get a true slot H-mode at low density at 0.643sec, nbar~0.9n20 Pth~1.6MW
Feb 23 2012 11:31:56:120AM	1120223006	Yunxing Ma	fizzle
Feb 23 2012 11:33:31:130AM	1120223007	Yunxing Ma	density lower to 0.7n20 no H-mode, early disruption at 1.1sec
Feb 23 2012 11:38:20:940AM	1120223008	Yunxing Ma	plasma last through flattop, density lower at ~0.7n20 no H-mode
Feb 23 2012 11:39:31:370AM	1120223009	Yunxing Ma	fizzle
Feb 23 2012 11:39:43:143AM	1120223010	Yunxing Ma	another fizzle
Feb 23 2012 11:39:57:803AM	1120223011	Yunxing Ma	early disruption
Feb 23 2012 11:51:45:663AM	1120223012	Yunxing Ma	early disruption at 0.58sec
Feb 23 2012 12:09:43:120PM	1120223013	Yunxing Ma	fizzle
Feb 23 2012 01:10:09:047PM	1120223014	Yunxing Ma	Good shots. Get H-mode in slot geometry. transiton time at ~0.8sec, nebar~0.8, Prf~2MW
Feb 23 2012 01:10:17:570PM	1120223015	Yunxing Ma	fizzle
Feb 23 2012 01:10:26:757PM	1120223016	Yunxing Ma	early disruption
Feb 23 2012 01:10:36:323PM	1120223017	Yunxing Ma	early disruption
Feb 23 2012 01:19:39:180PM	1120223018	Yunxing Ma	fizzle
Feb 23 2012 01:39:49:017PM	1120223019	Yunxing Ma	early disruption
Feb 23 2012 06:05:07:430PM	1120223020	Yunxing Ma	fizzzzzzzzzle
Feb 23 2012 01:59:12:307PM	1120223021	Yunxing Ma	Good shots, many H-modes
Feb 23 2012 02:25:58:920PM	1120223022	Yunxing Ma	fizzle next shot: increase nl04 to 7e19
Feb 23 2012 03:41:42:960PM	1120223023	Yunxing Ma	early disruption
Feb 23 2012 03:42:36:920PM	1120223024	Yunxing Ma	Good shot, L-H at 0.732, slot divertor, nebar~1.25n20
Feb 23 2012 03:42:47:990PM	1120223025	Yunxing Ma	fizzle
Feb 23 2012 03:43:17:050PM	1120223026	Yunxing Ma	fizzle
Feb 23 2012 03:46:10:577PM	1120223027	Yunxing Ma	good shot, L-H at 0.79sec, nebar~1.4n20,
Feb 23 2012 05:38:07:337PM	1120223028	Yunxing Ma	good shot, L-H transition at 0.85sec, nebar~1.9n20
Feb 23 2012 05:38:41:683PM	1120223029	Yunxing Ma	good shot, no L-H due to the RF power from D-ant was missing
Feb 23 2012 05:39:11:253PM	1120223030	Yunxing Ma	fizzle
Feb 23 2012 05:41:44:917PM	1120223031	Yunxing Ma	dithering transition from 0.7 to 0.76 sec, nebar~1.75 at 0.7sec nebar~2.3 at 0.76 sec
Feb 23 2012 05:47:26:737PM	1120223032	Yunxing Ma	dithering transition from 0.7 to 0.73 sec,
Feb 23 2012 05:48:28:477PM	1120223033	Yunxing Ma	good shot, L-H transition at 0.65 sec, nebar~1.3n20
Feb 23 2012 05:50:14:110PM	1120223034	Yunxing Ma	good shot, L-H transition at 0.607 sec, nebar~1.0n20

Physics Operator Comments
Feb 23 2012 09:16:19:497AM	1120223001	Earl Marmar	load from 1120209012 import segment 1 from 1120222016 into segment 1 plasma, full length startup looks ok
Feb 23 2012 09:28:21:870AM	1120223002	Earl Marmar	decrease RXL in segment 2, attempting to match shape of 1101221012 (but at 1 MA instead of 0.9 MA). plasma, full length strike point is on the bottom vertical-plate tile for most of the flattop.
Feb 23 2012 09:40:38:907AM	1120223003	Earl Marmar	decrease ZXL 5 mm, RXL 4 mm plasma, disrupt in rampdown (0.66 MA)
Feb 23 2012 09:58:50:900AM	1120223004	Earl Marmar	tweak shape during rampdown plasma, disrupted later in rampdown (0.35 MA)
Feb 23 2012 10:14:22:327AM	1120223005	Earl Marmar	no dpcs changes plasma went into H-mode early, then disrupt at .85 s G-H limiter is getting quite hot on the damaged tiles near the midplane
Feb 23 2012 10:19:05:900AM	1120223006	Earl Marmar	decrease RXL further after 1 second; try to keep the strike point in the slot longer tweak plasma current rise to try to get to 1 MA earlier fizzle
Feb 23 2012 10:48:53:057AM	1120223007	Earl Marmar	no additional dpcs changes plasma, disrupt at 1 s reports of A-port probe causing trouble G-H limiter also getting warm
Feb 23 2012 11:06:39:133AM	1120223008	Earl Marmar	BT to 5.4 T reduce prefill puff to 27 ms (from 30 ms) increase outer gap by 4 mm plasma, disrupt in rampdown
Feb 23 2012 11:11:19:083AM	1120223009	Earl Marmar	reduce RXL 5 mm during flattop increase nl_04 target to 4e19 (from 3.5e19) fizzle
Feb 23 2012 11:25:21:440AM	1120223010	Earl Marmar	increase prefill puff to 29 ms (from 27 ms) fizzle
Feb 23 2012 11:55:40:767AM	1120223011	Earl Marmar	EF4 10 A more negative for t<0 (now -1320 A) plasma, short, ugly, disrupt during current rise (0.35 MA)
Feb 23 2012 12:01:57:687PM	1120223012	Earl Marmar	no dpcs changes plasma, disrupt early in flattop (1 MA, 0.59 s)
Feb 23 2012 12:11:19:500PM	1120223013	Earl Marmar	tweak ZXL programming through flattop fizzle
Feb 23 2012 12:36:00:590PM	1120223014	Earl Marmar	no additional dpcs changes plasma, disrupt in rampdown
Feb 23 2012 12:42:04:993PM	1120223015	Earl Marmar	reduce prefill puff by 1 ms (now 28 ms) reduce segment 2 TF current to -149 kA (5.4 tesla instead of 5.5) fizzle
Feb 23 2012 01:03:38:180PM	1120223016	Earl Marmar	no dpcs changes plasma, short, ugly looks a lot like shot 11
Feb 23 2012 01:06:49:553PM	1120223017	Earl Marmar	no dpcs changes plasma, disrupt at .615 s looks a lot like shot 12
Feb 23 2012 01:24:10:823PM	1120223018	Earl Marmar	no dpcs changes fizzle, looks a lot like 13
Feb 23 2012 01:39:46:970PM	1120223019	Earl Marmar	tweak rcur and clearin during rampdown plasma, disrupt at 0.625 s on these early full-current disruptions, sawteeth are getting very small (locked mode?)
Feb 23 2012 01:52:46:997PM	1120223020	Earl Marmar	reduce prefill puff to 25 ms (from 28) increase nl_04 target to 5e19 (from 4e19) fizzle
Feb 23 2012 02:07:25:850PM	1120223021	Earl Marmar	increase prefill puff to 27 ms nl_04 target to 6e19 plasma, disrupt at start of rampdown
Feb 23 2012 02:25:30:010PM	1120223022	Earl Marmar	decrease prefill puff to 25 ms EF4 current to -1330 A (from -1320) fizzle
Feb 23 2012 02:58:54:770PM	1120223023	Earl Marmar	increase prefill puff to 27 ms EF4 current to -1320 A (from -1330) nl_04 target to 7e19 short, ugly
Feb 23 2012 02:59:20:273PM	1120223024	Earl Marmar	no dpcs changes plasma, disrupt at start of rampdown
Feb 23 2012 03:05:04:887PM	1120223025	Earl Marmar	cryopump on standby prefill puff to 12 ms nl_04 target to 8e19 tweak RCUR, CLEARIN, RXL during rampdown fizzle
Feb 23 2012 03:25:14:877PM	1120223026	Earl Marmar	prefill puff to 11 ms (from 12) fizzle
Feb 23 2012 03:33:00:470PM	1120223027	Earl Marmar	reduce early PG3 puff (t<0) plasma, full length
Feb 23 2012 03:53:20:950PM	1120223028	Earl Marmar	nl_04 target to 1e20 plasma, rampdown disrupt at 0.5 MA
Feb 23 2012 04:07:05:877PM	1120223029	Earl Marmar	nl_04 target to 1.1e20 plasma, disrupt at start of rampdown
Feb 23 2012 04:16:26:823PM	1120223030	Earl Marmar	prefill puff to 10 ms (from 11) fizzle
Feb 23 2012 04:33:37:740PM	1120223031	Earl Marmar	import segment 2 from 1120223028 into segment 2 (nl_04 target = 1.0e20) plasma, disrupt at start of ramp-down
Feb 23 2012 04:33:19:363PM	1120223032	Earl Marmar	no dpcs changes
Feb 23 2012 04:57:46:610PM	1120223033	Earl Marmar	import segment 2 from 1120223024 into segment 2 (nl_04 target = 7e19) plasma, rampdown disrupt (0.5 MA)
Feb 23 2012 05:21:48:433PM	1120223034	Earl Marmar	nl_04 target = 4e19 plasma, full length

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:02:36:450AM	Plasma	Ok
2	09:16:07:613AM	Plasma	Ok
3	09:29:08:410AM	Plasma	Ok
4	09:43:06:977AM	Plasma	Ok
5	09:58:40:157AM	Plasma	Ok
6	10:16:08:733AM	Plasma	Ok
7	10:30:38:187AM	Plasma	Ok
8	10:48:24:937AM	Plasma	Ok
9	11:06:27:027AM	Plasma	Ok
10	11:19:31:940AM	Plasma	Ok
11	11:32:20:983AM	Plasma	Ok
12	11:46:37:417AM	Plasma	Ok
13	12:04:50:733PM	Plasma	Ok
14	12:20:22:553PM	Plasma	Ok
15	12:36:05:250PM	Plasma	Ok
16	12:49:10:583PM	Plasma	Ok
17	01:02:03:967PM	Plasma	Ok
18	01:17:20:917PM	Plasma	Ok
19	01:30:37:473PM	Plasma	Ok
20	01:43:30:780PM	Plasma	Ok
21	01:56:17:793PM	Plasma	Ok
22	02:21:14:510PM	Plasma	Ok
23	02:34:00:783PM	Plasma	Ok
24	02:47:53:623PM	Plasma	Ok
25	03:01:14:860PM	Plasma	Ok
26	03:13:58:337PM	Plasma	Ok
27	03:26:55:270PM	Plasma	Ok
28	03:43:19:353PM	Plasma	Ok
29	03:56:51:380PM	Plasma	Ok
30	04:11:18:513PM	Plasma	Ok
31	04:24:16:137PM	Plasma	Ok
32	04:37:09:713PM	Plasma	Ok
33	04:50:38:703PM	Plasma	Ok
34	05:03:21:790PM	Plasma	Ok

System Availability

Feb 23 2012 09:02:18:227AM

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 golfit BES yes BES system is online Nov 22 2011 02:21PM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan Bolometers yes Midplane and LEDGE-AX diodes functioning properly. Midplane bolometers working and calibrated. LEDGE/DIV bolometers working, but toaster calibration not yet complete. Jan 23 2012 12:02PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke Boronization no Bottle Removed. System has been tested and will be ready once bottle is installed Jan 09 2012 06:32AM (dekow) Jim Irby Boronization dekow,irby CECE no   Jan 06 2012 03:48PM  Anne White Correlation ECE whitea CNPA yes Multiple channel CNPA available, no safety risk for in-vessel access Apr 14 2011 12:01PM (parker) Ron Parker Compact Neutral Analyzer parker Cryopump - Upper Divertor yes Operational. He level meter not working on 500L dewar. Frank will take manual readings. Jan 11 2012 11:46AM (labombard) Brian LaBombard Upper Divertor Cryopump dekow,irby,labombard CXRS yes core-CXRS system is online Nov 22 2011 02:21PM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,liao,rachmcd,rowan CXRS edge yes Michael CHurchill has primary responsibility at the moment Apr 19 2011 11:44AM (blip) Bruce Lipshultz Measurement of CXR light in the pedestal region at both the high- and low-field sides blip,rmchurch 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 no system is is installed and aligned, but not functional (appears to be a broken cable) Dec 05 2011 02:41PM (marmar) Earl Marmar Visible Bremsstrahlung Imaging marmar Disruption Mitigation no gas jet valve disabled on 2011/04/13 Apr 13 2011 02:04PM (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 DMBolo AXUV diodes yes Diodes are taking usable data. Not all post-processing code is working yet. Feb 01 2012 01:24PM (golynyk) Geoff Olynyk Set of six AXUV diodes in a toroidal array of midplane wall boxes. golynyk,granetz,mlreinke,whyte DNB yes   Dec 01 2011 11:46AM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,mochung ECDC yes Operational as of 11/19/11 Nov 22 2011 03:01PM (irby) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer FRC-ECE no Power off to RF and IF sections- Power on to DA Apr 11 2011 02:54PM (phillips) Perry Phillips Heterodyne ECE-32 channels bespam,liao,phillips,rowan,whitea FTCI no   Jan 06 2012 04:36PM  Jim Irby Fast two-color interferometer irby G-Side Ratiomatic yes   Dec 02 2011 12:24PM (toland) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland Glow Discharge no Power supply unplugged and redtagged, HV cables removed Apr 14 2011 08:03AM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby GPC yes Using new preamps. Nov 30 2011 07:51AM (hubbard) Amanda Hubbard ECE Polychromater hubbard GPC2 yes Dewar cold. Nov 21 2011 09:55AM (hubbard) Amanda Hubbard ECE Polychromater hubbard 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 system is functional and taking data Dec 05 2011 02:42PM (marmar) Earl Marmar H/D Ratio marmar HEAT yes   Jan 09 2012 06:32AM (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 Installed and aligned. Will be available for Ti/Vr profiles after focusing tests and locked modes are taken. Dec 06 2011 08:21AM (ypodpaly) John Rice High Resolution X-Ray cgao,ldelgado,rice,ypodpaly HXR yes 32 Channels operational,, no safety risk for in-vessel access Apr 14 2011 12:05PM (parker) Ron Parker Hard X-Ray Array faust,parker,schmidt ICRF D-Antenna no secured Apr 14 2011 08:55AM (wukitch) Steve Wukitch D-port antenna wukitch,ylin ICRF E-Antenna no secured Apr 14 2011 08:55AM (wukitch) Steve Wukitch E-port antenna wukitch,ylin ICRF J-Antenna no secured Apr 14 2011 08:56AM (wukitch) Steve Wukitch J-port antenna wukitch,ylin Impurity Spectroscopy yes Being upgraded with better optics and new spectrographs. Dan Miller has primary responsibility. Apr 19 2011 11:46AM (blip) Bruce Lipshultz Measurement of recycling light and impurity source rates at multiple surfaces around the tokamak blip,miller Laser Blow-Off yes Operational and tested Jan 06 2012 03:50PM (g) Martin Greenwald Impurity Injection System g,nthoward Lower Hybrid no LH HV Breaker Opened and Tagged, TPS Upgrade Underway Nov 10 2011 03:51PM (dterry) Ron Parker Lower Hybrid dterry,parker,wallaceg Lower Hybrid Reflectometer no off Apr 15 2011 08:24AM (dominguez) Arturo Dominguez Lower Hybrid Reflectometer dominguez,marmar,parker,sgbaek LoWEUS yes LoWEUS viewing the 10-30 nm region, spectral brightness vs. lambda and time are being stored in tree. Jan 23 2012 12:03PM (mlreinke) Matthew L. Reinke Long Wavelength Extreme Ultraviolet Spectrometer markchil,mlreinke LPI no Beam line removed May 30 2008 02:09PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar Ly-alpha yes Midplane Lyman-a and LEDGE-LY working normally. New B-PORT Lyman (BPLY) still being debugged. Jan 23 2012 12:04PM (mlreinke) Matt Reinke Lyman alpha cameras faustian,labombard,mlreinke Magnetics yes   Dec 01 2011 11:51AM (g) Robert Granetz Bp coils and flux loops for equilibrium control granetz,wolfe McPherson no **vacuum system problem*** McPherson viewing the 10-14 nm region for molybdenum monitoring. It's days are numbered as LoWEUS has demonstrated superiority. Jan 31 2012 08:15AM (mlreinke) Jim Terry VUV Spectrometer markchil,mlreinke,terry Michelson yes Front end at 4.5e-8 T. Reduced speed for initial operation. Nov 30 2011 07:51AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt MKS yes   Dec 02 2011 12:27PM (toland) Brian LaBombard Baratron pressure gauges labombard,toland 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 1/3/2011: push-pull mechanism broken. MSE inoperative Jan 03 2012 11:47AM (sscott) Steve Scott Motional Stark Effect jinseok,sscott Neutrons yes High voltage is on. We're ready for plasma. Nov 21 2011 12:58PM (fiore) Catherine Fiore Neutron Detectors fiore Neuts and Hards yes All detectors Powered On --- Waiting for neutrons for calibration Nov 22 2011 01:05PM (irby) Jim Irby X-Ray/Neutron Detectors at K-Hor irby NINJA yes C-bottom and new F-bottom system ready. Dec 02 2011 12:28PM (toland) Brian LaBombard NINJA gas puff labombard,terry,toland PCI yes Operational. Nov 30 2011 12:45PM (ntsujii) Miklos Porkolab Phase Contrast Imaging emd,ennever,ntsujii,porkolab Penning Gauges yes Operational. High voltage comes on during INIT and off at RECOOL. Dec 09 2011 09:48AM (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 yes 3 chords operational but with high noise level Jan 06 2012 04:22PM (irby) Jim Irby C-Mod Polarimeter irby Power - Alternator Air Switch yes   Jan 09 2012 06:33AM (dekow) Gary Dekow feeds all the other supplies cochran,dekow,dterry,irby Power - PEI yes   Jan 09 2012 06:33AM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby Power - TMX yes   Jan 09 2012 06:33AM (dekow) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby Power Systems yes   Jan 09 2012 06:33AM (dekow) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby Probe Array - ISD yes Operational, except for probe #1 (open circuit) and probe #16 (not installed). Dec 09 2011 09:50AM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard Probe Array - LH yes Operational, except for bottom-D probe (open circuit). Dec 09 2011 09:52AM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard Probe Array - OSD yes F-divertor ok. J-divertor ok, except for JDIV_06 which is shorted out. Dec 09 2011 09:54AM (labombard) Brian LaBombard Outer Lower Divertor Probe Array (F and J) labombard Probe Array - UDIV yes Operational except for probes #4, 5 and 13 (open) Dec 09 2011 09:56AM (labombard) Brian LaBombard Upper Divertor Probe Array labombard Reflectometer yes As of 1120105xxx, all channels are connected Jan 05 2012 09:14AM (dominguez) Earl Marmar Reflectometer dominguez,marmar Scanning Probe - ASP yes Ion Sensitive Probe head installed. Testing in piggy-back mode. Dec 20 2011 12:33PM (labombard) Brian LaBombard A-Port Scanning Probe labombard Scanning Probe - FSP yes Operational. Dec 09 2011 09:57AM (labombard) Brian LaBombard F-Port Scanning Probe labombard Scanning Probe - WASP yes A-port WASP is operational. K-port WASP is dead (all probes melted together). Dec 09 2011 09:58AM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick Shoelace Antenna yes Fixed frequency operation available (100kHz) at moderate power (< 0.5kW). Otherwise in receiver mode. Jan 11 2012 11:50AM (labombard) Brian LaBombard High-k active MHD antenna, for QCM, WCM studies golfit,labombard SOL reflectometer yes c-port waveguides operational, h-port waveguides are not. Nov 29 2011 12:04PM (cornwall) Cornwall Lau SOL reflectometer cornwall,wukitch,ylin Sparker yes New Type II sparker replaced Type I on 11/17/2011 Nov 23 2011 08:53AM (irby) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin Surface Science Station no SSS is up to air, no safety issues Apr 14 2011 12:06PM (ochoukov) Bruce Lipschultz Radially scanning probe located on K-port blip,ochoukov TCI yes TCI Operational. Density feedback operational. Nov 10 2011 11:47AM (irby) Jim Irby Two-Color Interferometer irby,murray TS - Core yes Operating with one 50Hz laser, precise density calibration still required. Feb 22 2012 08:37AM (jwhughes) Jerry Hughes Core Thomson scattering jrwalk,jwhughes,yma TS - Edge yes System taking data. Requires calibration. Feb 03 2012 04:05AM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jrwalk,jwhughes,yma Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf XEUS yes XEUS viewing the 1-6 nm region, spectral brightness vs. lambda and time are being stored in tree. Jan 23 2012 12:13PM (mlreinke) Matt Reinke X-ray Extended Ultraviolet Spectrometer markchil,mlreinke XTOMO yes ARRAY1->4 working normally, ARRAY5 (new core view) working but spatial calibration issues not yet resolved Jan 23 2012 12:13PM (mlreinke) Robert Granetz X-Ray Tomography faustian,granetz,mlreinke