Observation of Compressional Alfven Modes during Neutral Beam Heating on the National Spherical Torus Experiment

Fredrickson, E.D. ; Gorelenkov, N. ; Cheng, C.Z. ; Bell, R. ; Darrow, D. ; Johnson, D. ; Kaye, S. ; LeBlanc, B. ; Menard, J. ; Kubota, S. ; Peebles, W.

Princeton University. Plasma Physics Laboratory.

关键词: Nstx Device;    Beam Injection Heating;    70 Plasma Physics And Fusion Technology;    Plasma Density;    Alfven Waves;   

DOI  :  10.2172/788445
RP-ID  :  PPPL-3615
RP-ID  :  AC02-76CH03073
RP-ID  :  788445

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来源: UNT Digital Library

【 摘 要 】

Neutral-beam-driven compressional Alfven eigenmodes (CAE) at frequencies below the ion cyclotron frequency have been observed and identified for the first time in the National Spherical Torus Experiment (NSTX). The modes are observed as a broad spectrum of nearly equally spaced peaks in the frequency range from approximately 0.2 to approximately 1.2 omega(subscript ''ci''). The frequency has a scaling with toroidal field and plasma density consistent with Alfven waves. The modes have been observed with high bandwidth magnetic pick-up coils and with a reflectometer.