Miniproposals

Miniproposal: 495a Date Filed: 6/22/2007 Title: Alfvén Cascades studies with ICRH and LHCD First Author: Eric Edlund Session Leader: Eric Edlund (shots 1-24)

Engineering Operator Run Comment

automatically entered by signon - please replace with real comment

Session Leader Plans

Entered: Aug 22 2007 06:40:39:487PM

Author: Eric Edlund

MP #495a Alfven Cascade studies with ICRH and LHCD The purpose of these experiemnts is to investigate the excitation of Alfven Cascades in the current ramp phase, utilizing ICRH for heating and a fast ion source, and LHCD to maintain a reversed shear q-profile. With the help of ICRF for early heating, the LH system will be operated at mid and high n|| to achieve off-axis current drive. These experiments will adjust the relative timing of the ICRH and LHCD to try to maintain q>1 for as long as possible. ---------------------------- SETUP: target: 1070619006 Try to smooth the initial density rise as in shots 1070712017, 1070626017 and 1070712006. RF will turn on at 0.080 seconds and be off by 0.700 seconds. We will run plasmas to 1.5 seconds to allow MSE some time for calibrations - try to achieve steady density throughout the flattop and from 1.0 to 1.5 seconds. ICRF: all transmitters run-on by 8:30am LH: 90 degree ideal phasing, normal field, current direction waveform: step from 0 to 0.3 MW at 0.150 seconds, pulse length of 0.4 seconds, 75 kW per klystron. Set grill at 1.5 mm behind limiter. Diagnostics: 1) PCI and magnetics digitized at 10 MHz 2) Thomson and ECE required 3) Hirex requested with 1 or 2 ms integration time. No initial Ar puffing, can try Ar in the flattop 4) MSE will run in the Ohmic flattop after the RF is off. ---------------------------- SHOT SEQUENCE: 001: ICRF on at 0.080 seconds (E and J only), ramp to 2.0 MW at 0.100 seconds, full power to 0.700 seconds. *NO* LH on this shot. 002-005: increase ICRF power to 3.0 MW. Adjust plasma geometry as needed, perhaps running inner-nose limited. Increase rate of current ramp to reach 600 kA at 0.100 seconds. 006-007: Try running at 600 and 500 kA max plasma current. 008-013: Use 800 kA discharge and apply LHCD at 0.3 MW. Attempt to increase LH power to 0.4 MW or beyond. Move LH start time to 0.100 seconds. 014-015: Attempt to couple LH starting at 0.020 seconds. 016-023: Change LH to 120 degree phasing. Initial LH operation at 0.3 MW, turn on at 0.150 seconds, pulse length of 0.4 seconds. Over the next 7 next 7 shots, move the start time of LH earlier, and increase power to 0.4 or 0.5 MW. 024-025: Repeat best perfromance from prior 8 shots at 600 kA.

Physics Operators Plans

Entered: Aug 22 2007 09:18:56:507AM

Author: Bill Rowan

Engineering Setup for Thursday, 23 August 2007; Run 1070823 MP495A Alfven Cascade Studies with LHCD and ICRF SL: Eric Edlund PO: Bill Rowan Engineering Setup ------------------ Overnight ECDC Run begins at 09:00 and ends at 17:00 Power systems as on 1070619006 Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled Gas setup: --------- Fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 10 psi D2 DISABLED Enable the following gate valves and shutters, assuming no vacuum problems: ECE, VUV, DNB, Z-bolo shutters Torvac setup: Gate valves open after the shot ICRF Setup: ICRF required for this run LH Setup: LHCD required for this run DNB: DNB required for this run Cryopump: No cryopump for this run

Session Leader Summaries

Entered: Aug 23 2007 06:19:04:570PM

Author: Eric Edlund

MP #495a Disruptions were a present factor in initial operation, until shot 008. To try to reduce the impurity concentration, we tried pulling the plasma off the inner wall, this seemed to help. ICRF systems ran well, reaching 4 MW in the ramp on shot 014. LH experienced some troubles, losing an optical arc detection on klystron #10. Turned off the third crate and reduced power to about 240 kW. Main results are that cascades seem to be killed by the presence of LH. Simialar shots with and without LH show significant changes in RSAE activity, though TAE activity is, at first observation, unaffected. Initial results from hard x-ray data show that LH current is being driven on-axis in all cases. This may explain the loss of RSAEs. The slight amount of central reversed shear may be destroyed by the on-axis current drive. AE activity was never as clear today as it was on 1040406. Possible reasons are the plasma positioning on the inner wall and impurity concentration in the ramp-up. We did no run a plasma with LH operating prior to the ICRH. This would be a useful case to compare to, as we would be able to test if the current drive is capable of being localized off-axis in the absence of ICRF, or if it will always be centrally localized during the ramp because of lower temperatures and densities.

Physics Operator Summaries

Entered: Aug 24 2007 08:05:36:730AM

Author: Bill Rowan

C-Mod ran well today. There was an apparent EF1L power supply problem on the first shot which resulted in a dud. Engineering investigation did not identify a problem, and the failure did not recur. A computer problem caused the loss of one shot. ICRF and LH difficulties caused the loss of a couple of hours in the afternoon. No significant changes were made to segment 1 during the day. There were several disruptions. One (006) was associated with molybdenum influx. For the others, there was no measurement due to spectrometer HV shutdown during the shot. The disruptions were still useful for the SL since they occured after the end of the experimental period which was from 0.1 s to 0.2 s. Although requested in the run plan, ECDC was not run overnight prior to the run. Score card 17 plasmas (003,005,006,008,010,012,013,014,015,017,018,019,020,021,022,023,024) 04 fizzles (004,007,009,011) 03 engineering (001,002, 016) 24 total

Session Leader Comments
Aug 23 2007 10:03:17:953AM	1070823003	Eric Edlund	disruption at 0.73 seconds strong traces of coherent modes on magnetics, t=0.15, f~550 kHz faint traces on PCI
Aug 23 2007 10:31:33:480AM	1070823005	Eric Edlund	TAE traces seen on magnetics and PCI, no cascades. Increase RF power to 3 MW. adjust flattop current to 800 kA.
Aug 23 2007 10:48:22:257AM	1070823006	Eric Edlund	early disruption, moly injection try to pull the plasma off the inner wall Rf is going to try to ramp to full power around 0.12 seconds
Aug 23 2007 11:30:50:650AM	1070823008	Eric Edlund	some TAE modes disruption at 0.28 seconds reduce RF power and move LH to 0.120 seconds
Aug 23 2007 11:46:03:140AM	1070823010	Eric Edlund	good shot. some TAEs during the ramp and chirping modes during sawteeth try to put the plasma on the nose and repeat at same settings
Aug 23 2007 12:09:56:230PM	1070823012	Eric Edlund	good shot no cascades, early TAE activity try turning off LH and increasing ICRF power to 4 MW
Aug 23 2007 12:20:42:260PM	1070823013	Eric Edlund	good shot no cascades, early TAE activity D port did not fire. try to reduce ramp-up target density by about 10%, reduce flattop density t0 0.8
Aug 23 2007 01:40:55:720PM	1070823014	Eric Edlund	cascade activity. no LH
Aug 23 2007 01:41:37:533PM	1070823015	Eric Edlund	return after long break for ICRF no cascades, some TAE activity repeat again with no LH
Aug 23 2007 03:37:11:617PM	1070823018	Eric Edlund	return after long break for LH some TAE modes, no cascades LH tripped, running at 120 degrees ICRF running at 3+ MW sawteeth enter at about 0.210 seconds
Aug 23 2007 03:55:08:880PM	1070823019	Eric Edlund	good shot. LH set to 90 degrees to recover. No power to D cascadesm seen to start around 0.13 seconds, cut out midway through ramp sugessting that the reversed shear vanishes
Aug 23 2007 04:15:40:190PM	1070823020	Eric Edlund	good shot. LH set to 105 degrees TAES and some chirping modes after 0.150 seconds
Aug 23 2007 04:32:45:030PM	1070823021	Eric Edlund	good shot. LH set to 120 degrees TAEs, no cascades
Aug 23 2007 04:43:48:220PM	1070823022	Eric Edlund	good shot. LH set to 120 degrees some weak cascades showing up around 0.13 seconds LH this time starting at 0.16 seconds suggests that LH is killing cascades

Physics Operator Comments
Aug 23 2007 08:01:12:860AM		Bill Rowan	No overnight ECDC
Aug 23 2007 08:38:58:870AM		Bill Rowan	Loaded from 1070619006 Reminded to recalculate predictors Recalculated predictors for segments 2-3 (segment 4 is beam into gas test) Loaded segment 1 from 1070822027 seg 1 Loaded shot
Aug 23 2007 08:54:56:753AM		Bill Rowan	Loaded from seg 3 shot 1070629006 into seg 2. correction from SL
Aug 23 2007 09:23:38:157AM	1070823001	Bill Rowan	001. Dud. Problem with EF1L
Aug 23 2007 09:39:58:307AM	1070823002	Bill Rowan	002. PLC communtation test for EF1L for this test, the engineers loaded 1070315019 test shot worked. Next shot. Try for plasma again
Aug 23 2007 09:52:57:327AM	1070823003	Bill Rowan	003. Disruption at 0.72 s Long enough for SL, I think, but ...
Aug 23 2007 09:57:59:583AM	1070823003	Bill Rowan	Sharp increase on soft x-ray before the disruption. Next shot. No PCS changes
Aug 23 2007 10:06:24:050AM	1070823004	Bill Rowan	004. Take this to be the post-disruption fizzle Next shot. No PCS changes
Aug 23 2007 10:25:22:940AM	1070823005	Bill Rowan	005. Full length shot. For this shot we did increase the RF by 200 ms so that it now turns off at 0.9s Delay before this shot due to computer problems.
Aug 23 2007 10:27:29:427AM	1070823005	Bill Rowan	Next shot. Reduced ip to 0.8 MA
Aug 23 2007 10:29:12:367AM	1070823005	Bill Rowan	Extend the TF flattop to 2 s
Aug 23 2007 10:46:54:533AM	1070823006	Bill Rowan	006. Disruption at 0.4 s Spectroscopy reports moly influx
Aug 23 2007 10:49:47:710AM	1070823006	Bill Rowan	006. Disruption at 0.4 s Spectroscopy reports moly influx Next shot No pcs changes
Aug 23 2007 10:58:17:647AM	1070823007	Bill Rowan	007. The usual post disruption fizzle. Next shot. Increased the inner gap by approximately 4 mm
Aug 23 2007 11:09:38:070AM	1070823008	Bill Rowan	008. Plasma. Early disruption Next shot Increased the inner gap by another 5 mm
Aug 23 2007 11:16:14:440AM	1070823008	Bill Rowan	ncreased the outer gap by 5 mm at the request of LH
Aug 23 2007 11:20:06:150AM	1070823009	Bill Rowan	009. Post disruption fizzle Next shot. No further PCS changes
Aug 23 2007 11:44:27:170AM	1070823010	Bill Rowan	10. plasma Next shot RXL increased by approx 1.0 cm
Aug 23 2007 11:57:13:393AM	1070823011	Bill Rowan	011. Fizzle Next shot Add 2 ms to the prefill for a total of 19 ms
Aug 23 2007 12:20:36:840PM	1070823012	Bill Rowan	012. Plasma. Full length Next shot Reduced density slightly
Aug 23 2007 12:34:12:543PM	1070823013	Bill Rowan	013. Plasma
Aug 23 2007 12:33:40:667PM	1070823014	Bill Rowan	014. Plasma. Full length SL would prefer that the plasma have a larger outer gap and that it ride more on the inner nose Next shot. Increased the outer gap by approx 5 mm RXL reduce by 5 mm early ZXL reduced by 5 mm early
Aug 23 2007 01:44:38:617PM	1070823016	Bill Rowan	016. No power shot Computer problems.
Aug 23 2007 01:57:59:043PM	1070823017	Bill Rowan	017. Plasma. distuption at 0.5 s Next shot. reload 1070823015
Aug 23 2007 03:07:32:163PM	1070823017	Bill Rowan	LH problems. SL decided to reduce the LH by one cart of 8. This reduces the power, of course
Aug 23 2007 03:41:15:233PM	1070823018	Bill Rowan	018. plasma, full length Next shot. ZXL reduced by 5 mm between 0.1 and 0.2 s
Aug 23 2007 03:50:30:370PM	1070823019	Bill Rowan	019. plasma full length Next shot zxl reduced by 5 mm between 0.1 and 0.2 s
Aug 23 2007 04:07:51:273PM	1070823020	Bill Rowan	020. plasma, full length next shot. No pcs changes
Aug 23 2007 04:27:15:913PM	1070823021	Bill Rowan	021. plasma. full length next shot reduced nl_04 to 5e+19 at 0.2 s
Aug 23 2007 04:42:17:187PM	1070823022	Bill Rowan	022. plasma, full length next shot No PCS changes
Aug 23 2007 04:59:55:260PM	1070823023	Bill Rowan	023. plasma, full length next shot no pcs changes
Aug 23 2007 05:05:55:940PM	1070823024	Bill Rowan	024. plasma. early disruption Last shot.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:08:37:650AM	Plasma	Bad	EF1L com fault
2	09:36:39:800AM	Test	Ok	EF1 Commutation Test
3	09:49:18:103AM	Plasma	Ok
4	10:02:49:357AM	Plasma	Ok
5	10:21:14:200AM	Plasma	Ok
6	10:37:39:927AM	Plasma	Ok
7	10:51:28:823AM	Plasma	Ok
8	11:04:03:343AM	Plasma	Ok
9	11:17:07:503AM	Plasma	Ok
10	11:29:41:977AM	Plasma	Ok
11	11:45:28:310AM	Plasma	Ok
12	11:58:08:830AM	Plasma	Ok
13	12:11:16:450PM	Plasma	Ok
14	12:25:25:407PM	Plasma	Ok
15	01:21:47:737PM	Plasma	Ok
16	01:43:04:067PM	Plasma	Bad	No Power pcdaqenq 1 server problem
17	01:52:50:177PM	Plasma	Ok
18	03:31:42:717PM	Plasma	Ok
19	03:44:38:550PM	Plasma	Ok
20	03:58:15:603PM	Plasma	Ok
21	04:13:00:373PM	Plasma	Ok
22	04:31:44:077PM	Plasma	Ok
23	04:49:24:460PM	Plasma	Ok
24	05:03:51:047PM	Plasma	Ok

System Availability

Aug 23 2007 09:08:09:977AM

System Available Comment Availability Changed Owner Description Who Can Change Active MHD yes Fully operational Mar 28 2007 09:19PM (sears) Joe Snipes Active MHD Antenna sears,snipes BES yes vertical array of six views at R ~ 87.3 cm, radial array of three views out to R ~ 89 cm, both at outboard midplane. Three discrete fiber views of beam at R ~ 70.0, 76.5 and 82.5 cm. Feb 06 2007 10:00AM (bravenec) Ron Bravenec Beam Emission Spectroscopy bravenec Bolometers yes 2Pi diode operational, 2Pi foil being upgrade for noise resistance. Midplane foils calibrated and operational, data in the tree. Outboard midplane AXUV calibrated and operational, data in the tree. Full midplane and divertor views being digitized. Jul 19 2007 04:48PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke Boronization yes First Boronization 5/9/07 May 10 2007 04:55PM (irby) Jim Irby Boronization dekow,irby CNPA no   Jan 14 2007 02:06PM  Ron Parker Compact Neutral Analyzer parker Cryopump - Upper Divertor yes The cryopump is operational in a manual mode. We will be working on interfacing its control system with the C-Mod state machine for semi-automatic operation. May 30 2007 07:58PM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard CXRS yes The pedestal toroidal array was installed, spatially and absolutely calibrated. There are 10 chords intersect the beam at the major_R_range=[75,4:87.4]cm. Spatial resolution: 1.2 cm. The F-top poloidal array was installed and spatially calibrated. There are 19 chords intersect the beam at the major_R_range=[67.8:91.0]cm. Spatial resolution: 1.22 cm. Jun 20 2007 05:35PM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,rachmcd,rowan D Alpha yes \ha2_bright and \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 are available Mar 11 2007 10:28PM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe Dalsa yes camera is re-installed, and view has been calibrated Feb 26 2007 03:28PM (marmar) Earl Marmar Visible Bremsstrahlung marmar Disruption Mitigation no   Jan 14 2007 02:02PM  Bob Granetz Gas Jet granetz,whyte Divertor IR no   Mar 06 2007 10:50AM  Glen Wurden Divertor IR Digital Video gwurden,terry Divertor IR Spectroscopy no   Mar 06 2007 10:51AM  Glen Wurden Divertor IR Spectroscopy gwurden,ldorf,terry DNB yes All systems are operational, but as of 28 March 2007, the beam needs additional conditioning for full performance shots Mar 28 2007 09:36AM (beals) Bob Granetz Diagnostic Beam beals,granetz FRC-ECE no Still problems with low freq. RF section. Upper 16 channel working Aug 16 2007 02:45PM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips G-Side Ratiomatic yes The gauge is operational. Mar 30 2007 10:54AM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland GPC yes Chs 1-8 operational. May 24 2007 08:40AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt GPC2 yes Most channels (except 1,5,8,10,17) operational. Jun 08 2007 08:29AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt GPI yes New view just outside of the lower X-point is operational, but data is being archived locally , not to the tree. Midplane GPI is not operational. Mar 27 2007 01:59PM (terry) Jim Terry Gas Puff Imaging terry,zweben H/D yes spectral calibration needs to be checked, but system should be ready for the run Feb 26 2007 03:28PM (marmar) Earl Marmar H/D Ratio marmar Hirex Jr yes   Mar 06 2007 08:59AM (rice) John Rice High Resolution X-Ray ince,rice Hirex Sr yes Storing Data, but profiles not yet available Apr 27 2007 01:20PM (ince) John Rice High Resolution X-Ray ince,rice HXR yes Something might be wrong with channel 26; all others working fine. Mar 23 2007 10:43AM (schmidt) Ron Parker Hard X-Ray Array parker,schmidt ICRF D-Antenna yes 80.5 MHz. Max power is about 1.5 MW Jun 20 2007 09:23AM (ylin) Steve Wukitch D-port antenna wukitch,ylin ICRF E-Antenna yes 80 MHz. Maxc power is about 1.5 MW Jun 20 2007 09:23AM (ylin) Steve Wukitch E-port antenna wukitch,ylin ICRF J-Antenna yes 78 MHz. 4-strap configuration. Max ~ 3 MW. Jul 17 2007 03:52PM (ylin) Steve Wukitch J-port antenna wukitch,ylin Lower Hybrid no 6B Pressure window failed. Arcing in 6B, 8B,9B & 23B. May 04 2007 03:44PM (dterry) Ron Parker Lower Hybrid dterry,parker LPI yes   Apr 26 2007 08:35PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar Ly-alpha yes Midplane calibrated and operational, data being stored in tree. Divertor views showing significant noise, and not available. Upper view being digitized and analyzed. Jul 19 2007 04:49PM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke McPherson yes Working normally. Apr 19 2007 09:52AM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry Michelson yes Operational. Mar 28 2007 08:33AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt MKS yes E-Top, E-Bottom, F-top (cryo), G-side, and B-bottom are operational. F-top gauge has a 'sniffer tube' to measure pressures in cryopump gas box. Mar 20 2007 06:42PM (g) Brian LaBombard Baratron pressure gauges labombard MLP no Initial tests on the A-port scanning probe went well. We need to take care of some control glitches that caused some component failures. May 30 2007 08:01PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard MSE no (1) Bandpass filters replacement underway (2) Beam-into-gas spectrum measurement underway (3) Shutter mechanism currently unstable; remains open. (4) Expect beam-into-gas calibrations complete about 4/24. Apr 03 2007 12:05PM (sscott) Steve Scott Motional Stark Effect jinseok,sscott Neutrons yes Both neutron systems are fully operational Apr 05 2007 11:19AM (fiore) Catherine Fiore Neutron Detectors fiore Neuts and Hards yes operational Mar 21 2007 04:29PM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby NINJA yes All capillaries displayed by the NINJA_CONTROL GUI have been tested. NINJA puffed on 1070329009 (A-B limiter). Mar 29 2007 11:47AM (terry) Brian LaBombard NINJA gas puff labombard,terry PCI yes The system is to be optimized. May 30 2007 01:12PM (lianglin) Miklos Porkolab Phase Contrast Imaging edlund,lianglin,ntsujii,porkolab Penning Gauges yes 8 in-situ Penning ionization gauges appear to be operational: CB_DivU, CB_OutL, CB_DivL, KA_OutU, KA_OutL, B_DivL, Cryo_1, Cryo_2. Cryo_1 and Cryo_2 are new and installed in the upper cryopump 'gas-box'. Mar 13 2007 10:01PM (labombard) Brian LaBombard Penning Ionization Gauges labombard Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV (without an ND filter) are operational. Mar 27 2007 01:53PM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe Polarimeter no Retro shutter closed Mar 15 2007 11:00AM (irby) Jim Irby C-Mod Polarimeter irby Probe Array - ISD yes Probes at 15 of the 16 poloidal locations ('ramped' geometry) are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:47PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard Probe Array - LH yes All 6 probes on the lower hybrid launcher (tungsten, 1.5 mm projection) are operational. Mar 13 2007 09:46PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard Probe Array - OSD yes Probes at 10 poloidal locations (one 'ramped' and one 'flush') are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:45PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard Probe Array - UDIV yes 14 probes are operational ('ramped' geometry). n,Te, particle flux reported every 10 ms.Two high-gain channels are installed and operational for ECDC plasma diagnosis. Mar 13 2007 12:46PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard Reflectometer yes The 50, 60, 75 and 88 (u,l and center) are installed. The variable frequency channel is being tested. 110 is not functioning Aug 16 2007 01:45PM (dominguez) Earl Marmar Reflectometer dominguez,marmar Scanning Probe - ASP yes Perpendicular Mach probe head is installed. The drive is operational. Mar 15 2007 09:09PM (labombard) Brian LaBombard A-Port Scanning Probe labombard Scanning Probe - FSP yes Perpendicular Mach probe head is installed. The probe drive is now operational. Mar 13 2007 09:51PM (labombard) Brian LaBombard F-Port Scanning Probe labombard Scanning Probe - WASP yes A-port WASP successfully collected data on 04/04. Some intermittent open circuit on SE Electrode. K-WASP took data on 04/11. Both ready to scan as needed. Apr 12 2007 04:18PM (nsmick) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick TCI yes NL_04 at 71.04 cm from 3/9/07 calibration May 23 2007 07:38AM (irby) Jim Irby Two-Color Interferometer irby,murray TS - Core yes 2 lasers, 8 spatial channels. Density is calibrated based on ECE cutoffs obtained on 4 May 2007. Old spectrometers have been removed. Additional spatial channels have been added, but are not yet calibrated. Aug 07 2007 10:08AM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes,yma TS - Edge yes 2 lasers, 20 spatial channels. Fiber holder position is -121.0mm. Density is calibrated according to Raman scattering results from 26 May, supplemented with ECE cutoffs obtained on shot 1070531015. Aug 07 2007 10:08AM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes,yma Vispec yes 350 and 670 nm, 4 spatial channels May 04 2007 01:02PM (agraf) Alex Graf Visible Spectrometer agraf