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Title: Instabilities in magnetically insulated ion diodes

Abstract

Magnetically insulated ion diodes are being developed to drive inertial confinement fusion (ICF). To achieve this goal, very high beam intensities are required. Thus reducing the ion beam divergence is of considerable importance. Three dimensional particle-in-cell simulations have demonstrated that instability induced fluctuations cause significant ion beam divergence. These simulations exhibit a fast growing mode early in time, which has been identified as the diocotron instability. The divergence generated by this mode is modest due to the relatively high frequency. Later a low-frequency low phase-velocity instability develops. This instability couples effectively to the ions and can generate unacceptably large ion divergences, since the frequency is approximately the reciprocal of the ion transit time. A review of the linear stability theory of magnetically insulated ion diodes, indicates that the results depend rather sensitively on the details of the diode equilibrium model and the completeness of the stability analysis. The authors present new results based on a realistic family of ion diode equilibrium models using a fully relativistic electromagnetic stability analyses, which includes electron and ion perturbations both parallel and perpendicular to the applied magnetic field.

Authors:
;  [1]
  1. Sandia National Labs., Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Laboratory
OSTI Identifier:
182759
Report Number(s):
CONF-950612-
ISBN 0-7803-2669-5; TRN: IM9608%%124
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Book
Resource Relation:
Conference: 22. international conference on plasma science, Madison, WI (United States), 5-8 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of IEEE conference record -- abstracts: 1995 IEEE international conference on plasma science; PB: 312 p.
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; THERMIONIC DIODES; PLASMA INSTABILITY; INERTIAL CONFINEMENT; BEAM PRODUCTION; COMPUTERIZED SIMULATION; FOCUSING; THEORETICAL DATA

Citation Formats

Slutz, S.A., and Lemke, R.W. Instabilities in magnetically insulated ion diodes. United States: N. p., 1995. Web.
Slutz, S.A., & Lemke, R.W. Instabilities in magnetically insulated ion diodes. United States.
Slutz, S.A., and Lemke, R.W. Sun . "Instabilities in magnetically insulated ion diodes". United States.
@article{osti_182759,
title = {Instabilities in magnetically insulated ion diodes},
author = {Slutz, S.A. and Lemke, R.W.},
abstractNote = {Magnetically insulated ion diodes are being developed to drive inertial confinement fusion (ICF). To achieve this goal, very high beam intensities are required. Thus reducing the ion beam divergence is of considerable importance. Three dimensional particle-in-cell simulations have demonstrated that instability induced fluctuations cause significant ion beam divergence. These simulations exhibit a fast growing mode early in time, which has been identified as the diocotron instability. The divergence generated by this mode is modest due to the relatively high frequency. Later a low-frequency low phase-velocity instability develops. This instability couples effectively to the ions and can generate unacceptably large ion divergences, since the frequency is approximately the reciprocal of the ion transit time. A review of the linear stability theory of magnetically insulated ion diodes, indicates that the results depend rather sensitively on the details of the diode equilibrium model and the completeness of the stability analysis. The authors present new results based on a realistic family of ion diode equilibrium models using a fully relativistic electromagnetic stability analyses, which includes electron and ion perturbations both parallel and perpendicular to the applied magnetic field.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {12}
}

Book:
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