Effect of intrinsic microwave emission from a plasma on the development of the high-frequency beam-plasma instability of a relativistic electron beam in a metal chamber
Results are presented from an experimental investigation of the beam-plasma high-frequency (electron-electron) dissipative instability associated with the interaction between a long-pulse REB ({tau} = 100 {mu}s, E = 300 keV, I = 2-15 A) and a gas at a pressure of 0.02-8 torr in the absence of an external magnetic field. A description of the experimental device and the measurement technique (current, optical, and microwave diagnostics) are presented. The plasma was formed by the action of the beam itself in ionizing the neutral gas filling a metal chamber whose walls were coated with a radio-absorbent material during the course of the experiments. The critical current at which instability occurs was obtained as a function of the gas pressure and the distance over which the REB was transported. The spatial distribution of the microwave radiation emitted by the plasma when the instability was fully developed is presented. The effect on the instability was discovered of the intrinsic plasma microwave radiation reflected from the walls of the pressure chamber, which is related to the presence of feedback. The probable mechanism by which it arises are discussed. 26 refs., 8 figs.
- OSTI ID:
- 133225
- Journal Information:
- Soviet Journal of Plasma Physics, Vol. 18, Issue 3; Other Information: PBD: Mar 1992; TN: Translated from Fiz. Plazmy; 18: No. 3, 346-354(Mar 1992)
- Country of Publication:
- United States
- Language:
- English
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