Carter, T.A.

Caughman, J.

Crombé, Kristel

Gekelman, W.

Lau, C.

Martin, E.

Martin, M.

Perkins, R.

Pribyl, P.

TRIPATHI, S.K.P

Van Compernolle, B.

Van Eester, D.

Vincena, S.

Ghent University Academic Bibliography

Abstract Submittedfor the DPP17 Meeting ofThe American Physical SocietyFast wave experiments in LAPD: RF sheaths, convective cells anddensity modications1 T.A. CARTER, B. VAN COMPERNOLLE, M. MARTIN,W. GEKELMAN, P. PRIBYL, UCLA, D. VAN EESTER, K. CROMBE, Royal Mil-itary Academy, Belgium, R. PERKINS, PPPL, C. LAU, E. MARTIN, J. CAUGH-MAN, ORNL, S.K.P. TRIPATHI, S. VINCENA, UCLA | An overview is presentedof recent work on ICRF physics at the Large Plasma Device (LAPD) at UCLA. TheLAPD has typical plasma parameters ne  1012   1013cm 3, Te  1   10eV andB  1000G. A new high-power (150 kW) RF system and fast wave antenna havebeen developed for LAPD. The source runs at a frequency of 2.4 MHz, correspond-ing to 1  7fci, depending on plasma parameters. Evidence of rectied RF sheathsis seen in large increases ( 10Te) in the plasma potential on eld lines connected tothe antenna. The rectied potential scales linearly with antenna current. The recti-ed RF sheaths set up convective cells of local E B ows, measured indirectly bypotential measurements, and measured directly with Mach probes. At high antennapowers substantial modications of the density prole were observed. The plasmadensity prole initially exhibits transient low frequency oscillations ( 10 kHz). Theamplitude of the fast wave elds in the core plasma is modulated at the same lowfrequency, suggesting fast wave coupling is aected by the density rearrangement.1Work performed at the Basic Plasma Science Facility, supported jointly by theNational Science Foundation and the Department of Energy.Troy CarterUCLADate submitted: 14 Jul 2017 Electronic form version 1.4

Fast wave experiments in LAPD: RF sheaths, convective cells and density modifications

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Fast wave experiments in LAPD: RF sheaths, convective cells and density modifications

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Ghent University Academic Bibliography