Intense electron beam propagation by charge neutralization from a dielectric collimator

Author

Vijayan, T. ; Roychowdhury, P. ; Iyyengar, S.K.

Author_Institution

Accel. & Pulse Power Div., Bhabha Atomic Res. Centre, Bombay, India

Volume

22

Issue

2

fYear

1994

fDate

4/1/1994 12:00:00 AM

Firstpage

199

Lastpage

204

Abstract

An intense beam is not propagated in vacuum because of its space charge. In this work, an intense electron beam of 250 keV, 6 kA, 80 ns is propagated after initial collimation inside a short length of dielectric tube and further confinement provided by ions attributed to beam irradiation. Such beams have important potential in particle beam and controlled fusion research. It is seen that electrons are slowed down to the ion velocity, while ions are collectively accelerated by the beam space-charge. Collimator geometry is varied for space-charge control. Elongation of the beam pulse width to 100-300 ns is observed depending on propagation distance. Explanations are presented through physical model and scaling laws

Keywords

beam handling techniques; electron beams; particle beam diagnostics; space charge; 100 to 300 ns; 250 keV; 6 kA; 80 ns; beam irradiation; beam space-charge; charge neutralization; collimator geometry; controlled fusion research; dielectric collimator; dielectric tube; electron beam propagation; initial collimation; intense beam; ion velocity; particle beam research; propagation distance; scaling laws; space charge; Acceleration; Collimators; Dielectrics; Electron beams; Electron tubes; Geometry; Ion beams; Particle beams; Space charge; Space vector pulse width modulation;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.279023

Filename

279023