Beam-generated waves in a large plasma chamber
Plasma waves generated in a large vacuum chamber (20 x 30 m) by an electron beam of energy 0.5 to 2 keV, are measured. Both pre-beam plasma discharge (pre-BPD) and beam plasma discharge (BPD) states are investigated. The measured waves fall roughly into three categories: 1) a low-frequency spectrum with f << f/sub ce/, f/sub rho/; 2) a whistler mode spectrum; and 3) a high-frequency spectrum. The extremely low frequency waves are shown to be surface waves on a (nonneutral) plasma column but a higher frequency part of the low-frequency spectrum was not thoroughly investigated. It is speculated that it also represents surface waves on a nonneutral column. Its measured properties are consistent with the lower hybrid drift instability. The whistler mode spectrum seems to be a Cerenkov resonance with the lower Trivelpiece-Gould mode. It does not seem to play an important role in modifying the particle distributions. The high frequency spectrum is a Cerenkov resonance with the upper Trivelpiece-Gould mode. It is responsible for the major perturbation of the beam energy in BPD.
- Research Organization:
- School of Physics and Astronomy, Univ. of Minnesota, Minneapolis, MN 55455
- OSTI ID:
- 6742841
- Journal Information:
- IEEE Trans. Plasma Sci.; (United States), Journal Name: IEEE Trans. Plasma Sci.; (United States) Vol. PS-14:6; ISSN ITPSB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BEAM-PLASMA SYSTEMS
BEAMS
DISTURBANCES
DRIFT INSTABILITY
ELECTRON BEAMS
ENERGY RANGE
FREQUENCY DEPENDENCE
INSTABILITY
KEV RANGE
KEV RANGE 01-10
LEPTON BEAMS
MEASURING METHODS
PARTICLE BEAMS
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA MICROINSTABILITIES
PLASMA WAVES
RESONANCE
VACUUM SYSTEMS
WHISTLER INSTABILITY