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Author Marini, Samuel ♦ Rizzato, Felipe B. ♦ Pakter, Renato
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ ACCURACY ♦ COMPUTERIZED SIMULATION ♦ CROSSED FIELDS ♦ ELECTRON BEAMS ♦ ELECTRONS ♦ EQUIPMENT ♦ FLUCTUATIONS ♦ INJECTION ♦ NONLINEAR PROBLEMS ♦ SPACE CHARGE
Abstract The previous results based on numerical simulations showed that a cold electron beam injected in a crossed field gap does not reach a time independent stationary state in the space charge limited regime [P. J. Christenson and Y. Y. Lau, Phys. Plasmas 1, 3725 (1994)]. In this work, the effect of finite injection temperature in the transition from stationary to nonstationary states is investigated. A fully kinetic model for the electron flow is derived and used to determine the possible stationary states of the system. It is found that although there is always a stationary solution for any set of parameters, depending on the injection temperature the electron flow becomes very sensitive to fluctuations and the stationary state is never reached. By investigating the nonlinear dynamics of a characteristic electron, a theory based on a single free parameter is constructed to predict when the transition between stationary and nonstationary states occurs. In agreement with the previous numerical results, the theory indicates that for vanishing temperatures the system never reaches the time independent stationary state in the space charge limited regime. Nevertheless, as the injection temperature is raised it is found a broad range of system parameters for which the stationary state is indeed attained. By properly adjusting the free parameter in the theory, one can be able to describe, to a very good accuracy, when the transition occurs.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-03-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 23
Issue Number 3


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