Landau Damping Of The LH Grill Spectrum By Tokamak Edge Electrons

Recent experiments during lower hybrid (LH) current drive on Tore Supra have indicated the existence of suprathermal electrons in the scrape-off layer (SOL) all the way from the LH grill mouth to the last closed flux surface (LCFS). This finding contradicts the prediction of a narrow, less than abou...

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Bibliographic Details
Main Authors: Fuchs, V, Gunn, J P, Petrzilka, V, Horacek, J, Seidl, J, Ekedahl, A, Goniche, M, Hillairet, J
Format: Conference Proceeding
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABSORPTION
DISTRIBUTION FUNCTIONS
ELECTRONS
FLUTE INSTABILITY
LANDAU DAMPING
LOWER HYBRID CURRENT DRIVE
LOWER HYBRID HEATING
MAGNETIC SURFACES
ORAL CAVITY
PLASMA
PLASMA SCRAPE-OFF LAYER
TORE SUPRA TOKAMAK
TURBULENCE
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Summary:Recent experiments during lower hybrid (LH) current drive on Tore Supra have indicated the existence of suprathermal electrons in the scrape-off layer (SOL) all the way from the LH grill mouth to the last closed flux surface (LCFS). This finding contradicts the prediction of a narrow, less than about 5mm thick, LH power absorption zone adjacent to the grill mouth. The present contribution discusses the edge electron distribution function in a typical tenuous f and cold SOL, which supports relatively dense and hot blobs propagating outwards from the LCFS due to the interchange instability. The LH spectrum easily penetrates inward with little I damping but on encountering a blob it strongly damps and generates fast electrons at the blob I radial position.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.3273772