Study of transport of the electron beam produced by a pseudospark

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:42956

Liu, C J; Rhee, M J ^[1]

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1. Univ. of Maryland, College Park, MD (United States)

High-brightness electron beam produced by the pseudospark discharge has potential applications to such areas as the free-electron lasers, high-power microwave tubes, plasma processing, and advanced accelerators. In order for the electron beam to be useful for most of such applications, the beam energy is needed to be substantially increased. This requires that the beam must be transported at least to a distance necessary for the post acceleration. The electron beam is born in a low pressure gas filled chamber and accelerated by the voltage between the anode and cathode of the pseudospark. The extracted beam current in excess of 1 kA propagates through the same background low pressure gas. The gas in turn provides a background plasma by which the beam space charge can be effectively neutralized. Despite the high degree of the space charge neutralization, the beam is rapidly expanding radially in the drift tube due mainly to an exceedingly high current of low energy beam. In this work, the profile, divergence angle and emittance of the electron beam are measured at various axial positions. The experimental results are then compared with analytical results based on a simple model. Preliminary results of the beam envelope calculation are in qualitative agreement with the experiments. The details of the experimental and theoretical results will be presented.

• OSTI ID: 42956
• Report Number(s): CONF-940604--; ISBN 0-7803-2006-9
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BEAM EMITTANCE
BEAM EXTRACTION
BEAM PRODUCTION
BEAM PROFILES
BEAM TRANSPORT
COMPARATIVE EVALUATIONS
ELECTRIC POTENTIAL
ELECTRON BEAMS
USES