Characteristics of coherent diffraction terahertz radiation at SDUV-FEL

SYNCHROTRON TECHNOLOGY AND APPLICATIONS

Characteristics of coherent diffraction terahertz radiation at SDUV-FEL

LIU Ai-Qin，

LIU Gui-Min，

DAI Zhi-Min

Nuclear Science and Techniques

Vol.16, No.2

pp.70-75

Published in print 01 Apr 2005

CLC：TL54+4,O434.1

21400

Coherent diffraction radiation (CDR), generated by relativistic femtosecond electron bunches passing through an aperture in a metallic foil, is becoming widely used as a high brightness, coherent, polarized, and broadband terahertz radiation source. It is one of the most promising technique for non-destructive beam diagnostics in accelerators. In this paper, how to produce CDR is studied by utilizing femtosecond electron bunches at wavelengths equal to or longer than the bunch length with the aperture size at the condition of a≤γλ/(2π), which is provided by Shanghai Deep Ultraviolet-Free Electron Laser (SDUV-FEL) facility. General characteristics of CDR at SDUV-FEL are analyzed and numerically calculated. The results show that the radiance of this radiation within the frequency range from 0.2 up to 5 terahertz greatly exceeds that available from conventional black body radiation or synchrotron radiation.

Coherent diffraction radiationTerahertz radiation sourceSDUV-FEL

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