Miniproposals

Miniproposal: 619 Date Filed: 9/30/2010 Title: Effects of ICRF and LH power on SOL density pofiles First Author: Cornwall Lau Session Leader: Cornwall Lau (shots 1-7)

Engineering Operator Run Comment

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Session Leader Plans

Entered: Dec 6 2010 05:24:51:280PM

Author: Cornwall Lau

This is MP 619: Effects of ICRF and LH on SOL density profiles. This is a continuation in understanding the density profiles due to ICRF and LH. This section will focus on the effects due to high ICRF power in both L and H-modes. This run is scheduled for the first half of the day. If the neutral beam is not working, however, I have prepared extra shots for the second half of the day. Gas request: D2. No boronization and standard ECDC. Fill H-bottom with 20 psi N2 Hybrid DISABLED (PG5). I only need N2 if I get the afternoon part, but it's best to have it prepared. ICRF: E and J requested at maximum power LH: No, although the LH launcher needs to be moved in to .1mm. Cryopump: No DNB: Not required, but can be used. Requested diagnostics: Thomson scattering, LH langmuir probes Desired diagnostics: emissive/ion sensitive probes Run plan: Part a) Outer gap scan (4 shots). Load shot 1101203011. This was with helium; make sure this is with deuterium. Do this without ICRF, with 500kW E port ICRF, and 1.5MW E port ICRF. Switch to 5.1T for either 500kW or 1.5MW case Part b) H-modes (5 shots) Load 1101020001. Change current to 1MA. Power scan at high E/J power. (E will run at 1/1.5/.5 from .6 to .9 and J will run from 2/2.5/1 from 1.1 to 1.4). If H-modes are tough at low powers, move on to current scan at highest powers possible Current scan. Choose one of above case and do at .8 and 1.2MA. Part c) L-modes (5 shots). Repeat part b) with USN geometry. Load 1101116024 The rest will be extra shots in case I do get the afternoon too. Part d) Using upper and lower reflectometer horn (4 shots) Choose 1 shot from part b). and 1 shot from part c). Switch to upper and lower reflectometer horn. Cell access will be required to switch to a different reflectometer horn location. Part e) Repeat as much of a), b), c),d) as possible with nitrogen seeding. 70V from .4 to 1.4s is a good starting point, I think. I'm definitely willing to take suggestions if this part occurs.

Entered: Dec 6 2010 06:47:20:843PM

Author: Mike Churchill

These experiments will continue the edge transport studies of boron, but without the R-gap scans of the previous run days. Running today will be contingent on the DNB running succesfully during the first half of the day. Cryopump: On Working Gas Species: D2 Density: nl04 of .6, 2.5e20 Standard ECDC Overnight NINJA: Filled with 10psi D2 DISABLED Toroidal Field: 5.4 T Plasma Current: 0.8,1.0 ICRF Power: D & E antennae: 80 MHZ, maximum power J-antennae: 78 MHz, maximum power needed to supplement D and E to get to 4 MW DNB required: Current > 6A 80ms on 30ms off starting from 0.4s Required Diagnostics: Thomson Scattering (ne and Te) ECE (Te) TCI (ne) Soft X-ray arrays (all 4) CX measurements from gas puffs and DNB Requested Diagnostics (not required but desired) Reflectometry LLNL (XUES) Spectrometer RUN PLAN EDA H-modes Operate in Lower Single Null (LSN) reference is: 1100305019 1) Target is Steady State EDA H-Mode: Ip=0.8 MA and L mode target nl04=1e20 - 2) Target is Steady State EDA H-Mode: Ip=1.0 MA and L mode target nl04=1e20 If we obtain enough shots at these densities, we will try same current but lowering densities.

Physics Operators Plans

Entered: Dec 6 2010 08:56:19:167PM

Author: David Pace

------------------------------------------ Engineering Setup for Tuesday, December 7 ------------------------------------------ [AM Run] MP 619: Effects of ICRF and LH on SOL density profiles [PM Run] MP 595a: Analysis of the Radial Impurity Transport at the Pedestal Region Run begins at 09:00 and ends at 17:00 Power systems as on: 1101203011 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 Fill H-bottom with 20 psi N2 Hybrid DISABLED (PG5) 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, standard settings ICRF(yes/no): YES LH(yes/no): no (see Note 1) Cryopump (yes/no): YES (see Note 2) DNB (yes/no): not required, but can be used Note 1: there will not be any LH power injected into the plasma, but the launcher needs to be moved so that the SL's LH-SOL reflectometer can acquire data. Note 2: SL plan for the afternoon run requests cryopump. The cryopump has not been requested for the morning run. Vessel temperature: 35/35/35 --------- Run Plan --------- (a) Will load 1101203011 as first shot of the day. In that shot, PG4 is 25 ms wide, which is reasonable for a non-cryopump startup. No changes are necessary, so no temporary shot has been created. This shot also has a current rampdown, so we will be sure to monitor the limiter heat loads during this section. Magnetic field of 5.1 T is achieved with TF current of 141.7 kA. ** NOTE: in the reference shot, Segment 4 is the active flattop. ** (b) SL will revise this section based on comments from Y. Lin: H-mode is achieved by P_RF > 1.0 MW, making the 0.5 MW case unrealistic. (c) The reference shot, 1101116024, appears to have a crypump startup (PG4 at 50 ms width). Before moving on to this section it will be necessary to create a new shot program that uses the best startup segment (developed over the first few shots of the morning) and then imports Segment 2 from this reference shot. (d)-(e) These sections are contingent upon the SL receiving the afternoon for the continuation of this experiment. The plans involve additional shots based on achieved plasmas from the morning session so there is nothing to plan for ahead of time.

Session Leader Summaries

Entered: Dec 7 2010 06:12:26:593PM

Author: Cornwall Lau

Alternator issues were not fixed until 3:30, so we started extremely late and got in 7 plasmas shots, all of which were inner wall limited outer gap scans. There was one ohmic helium shot, so as to compare with a helium inner wall limited outer gap scan shot on Friday (1101203011). The rest used ICRF. The most interesting shot was shot 7 where we coupled ICRF into a 11.5cm outer gap plasma! The loading resistance also changed from about 10 to 5 on this shot, although there were a lot of ICRF trips at the beginning of the pulse. Other shots (3-6) also had pretty large changes in loading resistance and in nl04 demand; analysis of loading resistance compared with evanescent layer cutoff distance and nl04 can be done today. A small change in magnetic field will be done tomorrow.

Physics Operator Summaries

Entered: Dec 7 2010 05:33:21:270PM

Author: David Pace

Run Delayed until 3:30 pm --- The alternator developed a problem before the first shot this morning and most of the day was spent on dealing with the issue. We originally announced that there would be no plasma operations, but then the alternator reached operating speed earlier than expected. The SL seized the opportunity to further his research endeavor and opted to use the 1.5 hours of operation that were available. Startup --- Segment 1 from 1101203011 served as our startup segment with no alterations. All breakdowns were satisfactory and B_z0 held near zero. This suggests that the final shot of the day might be a good starting point for the rest of this week's experiments. Last shot = 1101207007 ** Note: do not use shot 1 from today as a startup because the Segment 1 gas programming was increased for use in the test shot. ** Operation --- Shot 1 was a successful test shot for the EF2 supply and the main gas puff. Shots 2 - 7 were all full length plasmas. In order to improve ICRF coupling during the greater reaches of the outer gap scan we increased the density request (nl04). This was done in addition to any RF changes performed by Y. Lin. Coupling improved on shots 6 and 7, with 7 providing the best shot of the day in this regard.

Session Leader Comments
Dec 7 2010 04:10:57:720PM	1101207002	Cornwall Lau	After extremely long delay, we've decided we can get a few shots in today. Attempt: repeat Matt's outer gap scan from Friday, except now with deuterium Result: Excellent. nl04 looks identical. A good comparision between deuterium and helium in ohmic. Next shot: Repeat except with 500kW E port ICRF from .6 to 1.5s
Jul 21 2011 02:17:19:203PM	1101207003	Cornwall Lau	Attempt: repeat RF except with .5MW ICRF Result: Pretty good. ICRF trips out a bit after .9s at a outer gap a bit above 6cm. There was a decent bit of change on E-port DC2 loading resistance, so maybe it's enough to see the outer gap's dependence on ICRF coupling Next shot: Repeat except with 1.3MW E port ICRF from .6 to 1.5s. Yijun is making some adjustments in hopes that we can extend the pulse a bit further.
Dec 7 2010 04:30:21:300PM	1101207004	Cornwall Lau	Attempt: repeat RF except with 1.3MW ICRF Result: RF trips out pretty early, but the loading resistance has changed significantly. It's quite possible that I'll get some useful data if I take data over only that blip. I'll have to look carefully. Next shot: Repeat except with .5MW E port ICRF from .8 to 1.5s. Yijun is making some adjustments to see if we can optimize to large outer gaps. That way, we can combine with shot 2
Dec 7 2010 04:45:16:903PM	1101207005	Cornwall Lau	Attempt: repeat RF except with .5MW ICRF Result: The loading resistance is really low (3.6 ohms), which is most likely causing the RF to trip. Yijun believes that the density is too low. We'll try that and 500kW from .6 to 1.5s again. Next shot: Increase the density and move ICRF back to .6 to 1.5
Dec 7 2010 04:52:05:890PM	1101207006	Cornwall Lau	Attempt: repeat with higher nl04 demand. Move RF back to .6 to 1.5s Result: Best one of today. Stopped at outer gap of 6.5cm. Next shot: We'll raise the density demand to .9 for next shot. This will also allow us to compare loading as a function of nl04 as well as outer gap.
Jul 21 2011 02:17:47:953PM	1101207007	Cornwall Lau	Attempt: repeat with higher nl04 demand of .9 Result: ICRF pulse ramped all the way to an outer gap of 11.5cm!!! This will require analysis. Next shot: No more. Last shot of the day. Thanks Dave for waiting the entire day and Yijun for making good changes (cheating the FFT), so as to keep the ICRF on at extremely high outer gaps. Is this reflectometer data even correct?

Physics Operator Comments
Dec 7 2010 03:39:28:710PM	1101207001	David Pace	*** Setting up for Plasma Operations *** Alternator returns to service ahead of schedule. SL would like to make use of 1+ hour of plasma operations (PO is not aware of any policy prohibiting this, so we are proceeding). Shot 1 Plan: Test shot for gas (B-main PG3) and EF2 power supply. Shot programming is changed in Segment 1 to test B-main, peak value at 90.0 is extended to 40 ms wide (the remaining square shape at 30.0 extends to 0.1 s). Shot 1 Actuality: Delayed start, - alternator issue caused it to operate at reduced RPM (Engineering Team investigating) - no one available to bring up ICRF (unforeseeable issues) Engineering reports test shot was successful (EF2 and PG3).
Dec 7 2010 05:24:16:217PM	1101207002	David Pace	Shot 2 Plan: Load shot 1101203011, then copy Segment 4 from that shot into Segment 2 of the newly programmed shot (because that reduces the odds of PO error by adjusting the inactive segment). Shot 2 Actuality: Full length shot, achieved outer gap scan as requested.
Dec 7 2010 04:18:40:667PM	1101207003	David Pace	Shot 3 Plan: Repeat shot 2, only ICRF changes requested. Shot 3 Actuality: Full length shot. Startup looks good, with B_z0 < 0.0006 and breakdown current matches that of good shots from last week.
Dec 7 2010 04:20:23:443PM	1101207004	David Pace	Shot 4 Plan: Repeat shot 3, only ICRF changes requested. Shot 4 Actuality: Full length shot, equilibrium behaving as requested.
Dec 7 2010 04:40:10:093PM	1101207005	David Pace	Shot 5 Plan: Repeat shot 4, only ICRF changes requested. Shot 5 Actuality: Shot ran, though there was an EF1 trip at the end that caused abnormal waveforms on OH supplies. Engineering is checking fuses.
Dec 7 2010 04:50:31:307PM	1101207006	David Pace	Shot 6 Plan: Begin with shot 5, increase nl04 request to 7e19 (was 5e19). Shot 6 Actuality: Full length shot, modest density increase achieved.
Dec 7 2010 05:03:47:620PM	1101207007	David Pace	Shot 7 Plan: Begin with shot 7, increase nl04 request to 9e19 (was 7e19). Shot 7 Actuality: Shot ran full, provided best density evolution of the day.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	03:34:49:623PM	Test	Ok
2	03:49:04:883PM	Plasma	Ok
3	04:04:16:120PM	Plasma	Ok
4	04:16:46:307PM	Plasma	Ok
5	04:29:49:433PM	Plasma	Bad	EF1 type 1 fault, fuses OK
6	04:45:30:553PM	Plasma	Ok
7	04:58:55:377PM	Plasma	Ok

System Availability

Dec 7 2010 03:34:33:873PM

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