Observation of ICRF (ion cyclotron range of frequencies) wave-packet propagation in a tokamak plasma
Experimental observation of ICRF wave-packet propagation in a tokamak plasma is reported. Studies were carried out in the Caltech Research Tokamak in a pure hydrogen plasma and in a regime where fast-wave damping was sufficiently small to permit multiple toroidal transits of the wave-packet. Waves were launched by exciting a small loop antenna with a short burst of rf current and were detected with shielded magnetic probes. Probe scans revealed a large increase in wave-packet amplitude at smaller minor radii, and the packet velocity was found to be independent of radial position. Measurement of the packet transit time yielded direct information about the wave group velocity. Packet velocity was investigated as a function of the fundamental excitation frequency, plasma density, and toroidal magnetic field. Results are compared with the predictions of a cold plasma model which includes a vacuum layer at the edge. 24 refs., 8 figs.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); California Institute of Technology (CalTech), Pasadena, CA (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 5702341
- Report Number(s):
- PPPL-2428; ON: DE88003472
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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ELECTRON DENSITY
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MAGNETIC FIELDS
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WAVE PACKETS
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700108* - Fusion Energy- Plasma Research- Wave Phenomena
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