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

Technical Report · Wed Oct 03 00:00:00 EDT 2001

DOI:https://doi.org/10.2172/788445· OSTI ID:788445

Fredrickson, E D ^[1]; Gorelenkov, N; Cheng, C Z; Bell, R; Darrow, D; Johnson, D; Kaye, S; LeBlanc, B; Menard, J; Kubota, S; Peebles, W

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1. Princeton Plasma Physics Laboratory

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.

• Research Organization: Princeton Plasma Physics Lab., NJ (US)
• Sponsoring Organization: USDOE Office of Science (US)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 788445
• Report Number(s): PPPL-3615
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
BEAM INJECTION HEATING
FREQUENCY RANGE
NSTX DEVICE
PLASMA DENSITY