Journal
RADIATION PHYSICS AND CHEMISTRY
Volume 78, Issue 12, Pages 1106-1111Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radphyschem.2009.05.009
Keywords
Femtosecond electron beam; Ultrafast electron diffraction; Photocathode rf gun
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A near-relativistic 100-fs MeV electron beam is developed by using a photocathode rf gun for revealing the hidden ultrafast dynamics of intricate molecular and atomic processes in materials through experimentation of ultrafast time-resolved electron diffraction (LIED). The transverse and longitudinal dynamics of femtosecond electron beam in the rf gun were studied theoretically by particle simulation. The growths of the emittance, bunch length and energy spread due to the rf and space charge effects were investigated by changing the laser parameters, field gradient and electron charge. The theoretical studies indicate that a 100-fs MeV electron beam with the transverse emittance of 0.1 mm mrad and the relative energy spread of 10(-3)-10(-4) at bunch charge of 0.1-2 pC (10(6)-10(7) electrons per pulse) is achievable for LIED, in which the intensity is three orders of magnitude higher than that produced by the conventional dc or pulsed guns. (C) 2009 Elsevier Ltd. All rights reserved.
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