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

Read more

Summary

INTRODUCTION

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]

Electromagnetic field
Electron beam dynamics
Initial charge distribution
Space-charge fields
ECSE FEL
PREBUNCHED BEAM THZ FEL
Findings
CONCLUSIONS
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call