A time-of-flight study of waves guided by a plasma column

Demokan, O.; Hsuan, H.; Lonngren, Karl E.; Aničin, B. A.

doi:10.1088/0032-1028/13/1/003

Cited by 7 publications

(1 citation statement)

References 15 publications

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“…Pulse measurements on wave supporting structures have the general advantage that they give information on group velocities directly. Experiments with a wave packet in the dipolar surface wave mode have been reported recently (Demokan et al 1970). The wave packet in these experiments was obtained by passing subnanosecond pulses through a band pass filter.…”

Section: Introductionmentioning

confidence: 99%

Excitation of nanosecond waves on positive columns

Aničin¹,

Babović²,

Lonngren

1972

J. Plasma Phys.

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Nanosecond pulses are launched, and propagate on a positive column in the form of electron waves. The dispersion of the pulses is studied experimentally, and is found to be in agreement with monochromatic experiments and theory. Apart from wave attenuation, which is observed to depress signals of higher frequencies, Fourier analysis of the received pulses has revealed that the launching mechanism favours frequencies in the vicinity of 1/6ωp A full-wave theory, based on an extension of Goubau's excitation theorem, is derived, and successfully contrasted with experiment.

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Section: Introductionmentioning

confidence: 99%

Excitation of nanosecond waves on positive columns

Aničin¹,

Babović²,

Lonngren

1972

J. Plasma Phys.

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Surface-Wave Propagation in Homogeneous Plasmas

Aliev

Schüter

Shivarova

2000

Guided-Wave-Produced Plasmas

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Observation of wave-packet propagation in the ion cyclotron range of frequencies in a tokamak plasma

Greene

Gould

1991

Physics of Fluids B: Plasma Physics

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Experimental observation of wave-packet propagation in the ion cyclotron range of frequencies in a tokamak plasma is reported. Studies were carried out in the Caltech Research Tokamak [Phys. Fluids 23,614 ( 1980) ] 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 radio-frequency 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 that includes a vacuum layer at the edge.

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A time-of-flight study of waves guided by a plasma column

Cited by 7 publications

References 15 publications

Excitation of nanosecond waves on positive columns

Excitation of nanosecond waves on positive columns

Surface-Wave Propagation in Homogeneous Plasmas

Observation of wave-packet propagation in the ion cyclotron range of frequencies in a tokamak plasma

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