Ion beam divergence from unstable fluctuations in applied-[ital B] diodes
- Laboratory of Plasma Studies, Cornell University, Ithaca, New York 14853 (United States)
An electron plasma oscillation driven unstable by ion streaming is identified with the low-frequency mode observed in QUICKSILVER [[ital Computational] [ital Physics], edited by A. Tenner (World Scientific, Singapore, 1991), pp. 475--482] numerical simulations. This mode heats the electrons along the magnetic field and is ultimately stabilized by the thermal spread. A quasilinear theory determines the saturation level of the fluctuations, the ion divergence, and the ion energy and momentum spread as they exit the diode. The ion divergence is predicted to be independent of the ion mass for fixed diode voltage and scales as the product of the effective gap and the ion beam enhancement factor over Child--Langmuir current.
- OSTI ID:
- 5409018
- Journal Information:
- Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 5:5; ISSN PFBPEI; ISSN 0899-8221
- Country of Publication:
- United States
- Language:
- English
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426000 -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
661220* -- Particle Beam Production & Handling
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAM DYNAMICS
BEAMS
DIODE TUBES
ELECTRON PLASMA WAVES
ELECTRON TUBES
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FLUCTUATIONS
INSTABILITY
ION BEAMS
LEPTONS
NUMERICAL SOLUTION
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
PLASMA WAVES
Ta
Targets-- (1992-)
VARIATIONS