Abstract
A single pass, THz spectral range free-electron laser (FEL) driven by a photocathode hybrid rf-LINAC is considered, taking the Israeli THz FEL project developed in Ariel University as an example. Two possible configurations of such FEL are discussed: an enhanced coherent spontaneous emission FEL, and a prebunched FEL utilizing periodically modulated short electron beam pulses. A general study of the FEL configurations is carried out in the framework of a space-frequency approach, realized in WB3D numerical code. The configurations are studied and compared based on preliminary parameters of a drive hybrid rf-LINAC gun under development in University of California, Los Angeles.
Highlights
Tera-Hertz electromagnetic radiation is currently of interest for many applications such as basic science, medical and biological applications, spectrometry, remote detection, and more
enhanced coherent spontaneous emission (ECSE) free-electron lasers (FELs) [2] utilizes a constructive energy-phase correlation [3], which results in an enhancement of undulator coherent spontaneous emission (CSE) of short electron pulses
Enhanced coherent spontaneous emission is obtained in FELs driven by short electron pulses which are subjected to a controlled energy chirp
Summary
Tera-Hertz electromagnetic radiation is currently of interest for many applications such as basic science, medical and biological applications, spectrometry, remote detection, and more. Modern THz free-electron lasers (FELs) often can fit a “table-top” size They are able to provide intense coherent radiation over a wide range of THz frequencies. Note that a hybrid rf-LINAC structure including both standing and traveling waves sections enables production of short (picosecond or sub-picosecond scale long) electron beam pulses with a controlled energy chirping. Two possible configurations of the FEL are considered and compared in this work: an enhanced coherent spontaneous emission (ECSE) FEL discussed in [2], and a prebunched FEL utilizing periodically modulated short electron beam pulses. ECSE FEL [2] (called in the publication as an “enhanced super-radiance” FEL) utilizes a constructive energy-phase correlation [3], which results in an enhancement of undulator coherent spontaneous emission (CSE) of short (a radiation wavelength long or shorter) electron pulses. The model was realized in a numerical code WB3D and has been successfully applied to the analysis of various effects in FEL devices [6,7,8,9,10,11,12]
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