Temporal Profile of the LCLS Photocathode Ultraviolet Drive Laser Tolerated by the Microbunching Instability | Zendy

Juhao Wu | Zendy

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Temporal Profile of the LCLS Photocathode Ultraviolet Drive Laser Tolerated by the Microbunching Instability

Author(s) -

Juhao Wu

Publication year - 2004

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/826984

Subject(s) - photocathode , cathode ray , laser , lasing threshold , optics , instability , physics , laser beam quality , cathode , extreme ultraviolet , plasma channel , electron , ultraviolet , beam (structure) , plasma , materials science , laser beams , chemistry , nuclear physics , mechanics

The LCLS electron beam generated in the photoinjector is subject to various instabilities in the downstream acceleration and compression. The instability can be initiated by e-beam density modulation at birth. In this paper, we prescribe the tolerance on the initial e-beam density modulation possibly introduced by the ultraviolet (uv) laser at the cathode. Our study shows that the initial rms density modulation of the e-beam at the photocathode shall be less than 5 % to ensure the FEL lasing and saturation.

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