Image charge focusing of relativistic electron beams
作者:
S. Humphries,
Carl B. Ekdahl,
期刊:
Journal of Applied Physics
(AIP Available online 1988)
卷期:
Volume 63,
issue 2
页码: 583-585
ISSN:0021-8979
年代: 1988
DOI:10.1063/1.340094
出版商: AIP
数据来源: AIP
摘要:
Experimental results are reported on the transport of a relativistic electron beam by image charge effects. The transport system consisted of a cylindrical metal tube periodically interrupted by transverse conducting grids with high transparency. Partial cancellation of the beam electric fields increased the space‐charge‐limited current level, allowing propagation in a magnetically self‐pinched mode. A 400‐keV, 4‐kA beam traveled 30 cm in high vacuum through 10 focusing foils. Capture of the beam was almost 100% efficient; beam emittance was not severely degraded during capture and transport. The radius of the self‐contained beam was 1.4 cm; the beam position was centered by the image current in the transport tube to within 1 mm. The favorable results imply that image charge focusing could be considered for transport in high‐current linear induction accelerators.
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