LINEAR ELECTROSTATIC INSTABILITY OF THE ELECTRON BEAM ION SOURCE
Linear plasma fluid theory is used to study the stability of a cold electron beam in Brillouin equilibrium which passes through a stationary cold ion background, with particular interest in stability for parameters relevant to EBIS devices. Dispersion is studied both analytically and numerically. For {ell}=0, the usual infinite medium two stream instability condition is shown to correspond to a requirement that beam perveance exceed a minimum value, P>33 {micro}pervs; hence, this mode is stable for EBIS (P {approx} l{micro}perv). The Brillouin equilibrium rotation is shown to cause an electron-ion rotating stream instability, which is convectively unstable. The {ell}=1 mode is also found to be unstable. Higher modes numbers, {ell}>1, are unstable, but have reduced growth. Instability is only weakly affected by finite beam radius and boundary conditions.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Accelerator& Fusion Research Division
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 937097
- Report Number(s):
- LBL-13770; NUIMAL; TRN: US200820%%101
- Journal Information:
- Nuclear Instruments and Methods, Journal Name: Nuclear Instruments and Methods; ISSN 0029-554X
- Country of Publication:
- United States
- Language:
- English
Similar Records
3D Plasma Equilibrium and Stability with Hot Particle Anisotropic Pressure
Linear study of the beam-plasma interaction as a source mechanism for the broadband electrostatic emissions observed in the electron foreshock