RF wave observations in beam-plasma discharge. Final Report
The Beam Plasma Discharge (BPD) was produced in the large vacuum chamber at Johnson Space Center (20 x 30 m) using an energetic electron beam of moderately high perveance. A more complete expression of the threshold current I sub c taking into account the pitch angle injection dependence is given. Ambient plasma density inferred from wave measurements under various beam conditions are reported. Maximum frequency of the excited RF band behaves differently than the frequency of the peak amplitude. The latter shows signs of parabolic saturation consistent with the light data. Beam plasma state (pre-BPD or BPD) does not affect the pitch angle dependence. Unexpected strong modulation of the RF spectrum at half odd integer of the electron cyclotron frequency (n + 1/2)f sub ce is reported (5 n 10). Another new feature, the presence of wave emission around 3/2 f sub ce for I sub b is approximate I sub c is reported.
- Research Organization:
- Rice Univ., Houston, TX (USA)
- OSTI ID:
- 5654416
- Report Number(s):
- N-86-20141; NASA/CR-176574
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700104* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Experimental-- (-1987)
BACKSCATTERING
BEAM-PLASMA SYSTEMS
BEAMS
DATA
ELECTRIC DISCHARGES
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
EXPERIMENTAL DATA
INFORMATION
LEPTON BEAMS
NUMERICAL DATA
PARTICLE BEAMS
PLASMA DENSITY
PLASMA JETS
RADIATIONS
RADIOWAVE RADIATION
SCATTERING
TEST FACILITIES