Optimal Charge of a Photocathode Gun for a Compact X-ray Free-Electron Laser

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Published 22 February 2010 Copyright (c) 2010 The Japan Society of Applied Physics
, , Citation Tae-Yeon Lee et al 2010 Jpn. J. Appl. Phys. 49 022701 DOI 10.1143/JJAP.49.022701

1347-4065/49/2R/022701

Abstract

For a photocathode gun, the optimal charge per gun pulse is derived to give the theoretically allowed smallest saturation length of the X-ray free-electron laser based on the self amplified spontaneous emission scheme. The derivation is approximate, but the result is practically independent of specific machine design. The objective is to contribute to the study of a compact X-ray free-electron laser.

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10.1143/JJAP.49.022701