ࡱ> a /jbjbtt ^%-$nPL2n (666,tRCQ9|C 66 66 t$J N=A QN0A 0,~ ~`A nnJS/nnS Princeton Plasma Physics Laboratory NSTX Experimental ProposalTitle: Edge Electrode Biasing for SOL Control OP-XP-802Revision: v. 1Effective Date: 1/9/08 Expiration Date: (2 yrs. unless otherwise stipulated)PROPOSAL APPROVALSResponsible Author: Zweben, Maqueda, Roquemore, Marsala, Raitses, KaitaDate 1/9/08ATI ET Group Leader: V. SoukhanovskiiDateRLM - Run Coordinator: M. Bell / R. RamanDateResponsible Division: Experimental Research OperationsChit Review Board (designated by Run Coordinator) MINOR MODIFICATIONS (Approved by Experimental Research Operations) NSTX EXPERIMENTAL PROPOSAL TITLE: Edge Electrode Biasing for SOL Control No. OP-XP-802 AUTHOR: Zweben, Maqueda, Roquemore, Raitses, Marsala, Kaita Date: 1/9/08 1. Overview of planned experiment This XP will use the newly installed upgrades to the Biased Electrode and Probe system (BEaP) to continue tests of whether a local poloidal electric field can affect the SOL transport in NSTX. The electrode hardware is essentially the same as used for XP#744 in 2007. Upgrades for 2008 include increased bias current capability (from 10 to 30 Amps), a radial probe array between two electrodes, and a capability to view BEaP with fast cameras. This XP will use these new capabilities, try a test of a new double-probe bias configuration, and try electrode biasing with NBI and RF (the latter most likely by piggybacking). 2. Theoretical/ empirical justification This XP will continue to test one of the very few existing theoretical ideas for modifying the SOL in magnetically confined plasmas. If successful, this could lead to methods to control and reduce the peak particle and heat flux in any magnetic fusion device. The theory and its previous application to the MAST experiment has been described in: R.H. Cohen et al, Plasma Convection Induced by Toroidal Asymmetries of the Divertor Plates and Gas Puffing, Nucl. Fusion 37 (1997) 621 ; D.D. Ryutov et al, On the Possibility of Inducing Strong Plasma Convection in the Divertor of MAST, Plasma Phys. Cont. Fusion 43 (2001) 1388 ; G.F. Counsell et al, Reduction of Divertor Power Loading in MAST, 30th EPS Conference (2003) paper P-3.202 ; and R.H. Cohen et al, Current and Potential Distribtion in a Divertor with Toroidally-Asymmetric Biasing of the Divertor Plate, Plasma Phys. Cont. Fusion 49 (2007) 1. The basic idea is very simple: the application of a local poloidal (DC) electric field will cause a local Vr = Epol x B drift in the radial direction, which can in principle move and/or broaden the SOL. The electric field needed to do this in NSTX should be quite low (~ 10 V/cm) since the B field is quite low. This field level can be created by the small electrode set installed in the shadow of the RF antenna for this run. The main physics question is how far the potential induced by the electrodes penetrates along and across the B field. Some success was obtained by using a (somewhat differently designed) electrode set in MAST. A secondary physics question is to determine whether the application of this local bias affects the edge turbulence locally, which could cause additional changes in the SOL width. 3. Experimental run plan The run plan is based on repeating the plasma condition used in XM-744 (Edge Electrode Bias for SOL Control), i.e. shot #124688 (B= 4.5 kG, I=0.8 MA, Ohmic, outer gap slowly reduced from ~ 5 cm to ~ 1 cm over the 0.3 sec duration of the discharge). This condition had the proper B field line angle for connecting the biased electrodes to the GPI diagnostic. The nominal day XP will be divided into 4 parts, each of which will need to be done on a separate day due to hardware reconfigurations and analysis required between parts: 1st hour: single-electrode voltage scan up to +100 V (d" 30 A) monitor BEaP probe array, local D( light at BEaP, GPI images look for effects on plasma (impurities, radiation, divertor) after this, check probe-GPI correlations for alignment 2nd hour: optimize alignment based on shots #1-5 (i.e. adjust Ip) try four electrode biasing +/-/+/- (VExB outward at array) 3rd hour: reconfigure for double-probe biasing (pending review) 4th hour: repeat best case, or try with NBI (using ~5 cm gap) Approximate Shot Sequence XP #802 shot # plasma type bias voltage (1,2,3,4) comments 1 OH, 0.8 MA, 4.5 kG 0, 0, 0, 0 recover #124688 2  same 0, 0, +25, 0  3  same 0, 0, +50, 0  4  same 0, 0, +75, 0 stop if near 30 amps 5  same 0, 0, +100, 0 stop if near 30 amps 6  same 0, 0, 0, 0 repeat shot #1 7  same +25, -25, +25, -25  8  same +50, -50, +50, -50  9  same +50, -50, +50, -50  10  same +75, -75, +75, -75  11  same +100, -100, +100, -100  12  same +25, -25, +25, -25 try double probe bias 13  same +50, -50, +50, -50 try double probe bias 14  same +75, -75, +75, -75 try double probe bias 15  same +100, -100, +100, -100 try double probe bias 16  same but with 1 NB +25, -25, +25, -25 gap constant at 5 cm 17  same but with 1 NB +50, -50, +50, -50 gap constant at 5 cm 18  same but with 1 NB +50, -50, +50, -50 gap constant at 5 cm 19  same but with 1 NB +75, -75, +75, -75 gap constant at 5 cm 20 same but with 1 NB +100, -100, +100, -100 gap constant at 5 cm  4. Required machine, NBI, RF, CHI and diagnostic capabilities Ohmic plasmas, for most of shots. One source NBI for last part, but with 5 cm outer gap. Necessary Diagnostics: GPI with gas puff and fast camera with close-up view of BEaP electrodes(Maqueda), fast camera to view electrode region from the other side of the machine (Roquemore) SPRED to monitor plasma for possible iron influx from electrodes (Robinson). Desirable diagnostics: Divertor Dalpha views to monitor effects at divertor strike point. CHERS and edge rotation diagnostics. 5. Planned analysis The effect of the electrodes on the local SOL can be determined by the GPI and by the Langmuir probes mounted in the biased electrode holder. If there is a fast radial convection induced by the electrode bias, the GPI gas cloud should also move radially (as seen in the MAST experiment). The turbulence radial speed can also be measured by the GPI images. The edge turbulence fluctuation levels, correlation lengths, and autocorrelation times between the electrodes can be measured by the local probes. The results will be directly compared with the analytical models mentioned above. Comparisons with the XGC code of CS Chang will be attempted. Comparison with the MAST results will also be made. 6. Planned publication of results The results will be used in a contributed paper in the PSI 2008 conference and (probably) a paper at the 2008 Diagnostics conference. They will also be written as a full-length paper in Phys. Plasmas, NF, or PPCF. PHYSICS OPERATIONS REQUEST Title Edge Electrode Biasing for SOL Control OP-XP-802 Machine conditions (specify ranges as appropriate) ITF (kA): 4.5 kG and 3.0 kG Flattop start/stop (s): IP (MA): 800 KA Flattop start/stop (s): Configuration: Shots #1-15 same as #124688. Shots #15-20 same but constant 5 cm gap with one NBI source. Outer gap (m): down to ~ 1 cm Inner gap (m): Elongation k: Triangularity d: Z position (m): Gas Species: Injector(s): NBI - Species: D Sources: Voltage (kV): Duration (s): ICRF  Power (MW): Phasing: Duration (s): CHI: Either: List previous shot numbers for setup: #124688 Or: Sketch the desired time profiles, including inner and outer gaps, k, d, heating, fuelling, etc. as appropriate. Accurately label the sketch with times and values. DIAGNOSTIC CHECKLIST Title OP-XP-744 DiagnosticNeedDesireInstructionsBolometer tangential arrayXBolometer divertor XCHERS toroidalCHERS poloidalDivertor fast cameraXDust detectorEBW radiometersEdge deposition monitorsEdge pressure gaugesEdge rotation diagnosticXFast ion D_alpha - FIDAXFast lost ion probes - IFLIPFast lost ion probes - SFLIPFilterscopesXFIReTIPXGas puff imagingXHa camera - 1DXHigh-k scatteringInfrared camerasXInterferometer - 1 mmXLangmuir probes - divertorXLangmuir probes RF antennaXMagnetics DiamagnetismXMagnetics - Flux loopsXMagnetics - Locked modesXMagnetics - Pickup coilsXMagnetics - Rogowski coilsXMagnetics - RWM sensorsXMirnov coils high frequencyXMirnov coils poloidal arrayXMirnov coils toroidal arrayXMSENPA ExB scanningNPA solid stateNeutron measurementsPlasma TVXReciprocating probeXReflectometer 65GHzXReflectometer correlationXReflectometer FM/CWXReflectometer fixed fXReflectometer SOLXRF edge probesXSpectrometer SPREDXSpectrometer VIPSXSWIFT 2D flowXThomson 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