Compact high-power terahertz radiation source

G A Krafft

doi:10.1103/physrevstab.7.060704

Abstract

In this paper a new type of THz radiation source, based on recirculating an electron beam through a high gradient superconducting radio frequency cavity, and using this beam to drive a standard electromagnetic undulator on the return leg, is discussed. Because the beam is recirculated and not stored, short bunches may be produced that radiate coherently in the undulator, yielding exceptionally high average THz power for relatively low average beam power. Deceleration from the coherent emission, and the detuning it causes, limits the charge-per-bunch possible in such a device.

Highlights

In the past two years, there have been a number of papers published addressing the subject of producing THz radiation through the coherent synchrotron radiation (CSR) emission process [1,2,3]
These studies assume a storage ring source; the CSR is produced by coherent synchrotron emission from density variations at wavelengths short compared to the overall bunch length in the storage ring
THz radiation offer the promise of higher power compared to ring-based sources, primarily because the electron pulse lengths possible from recirculated linacs may be made shorter than the emission wavelength, whereas the emission in storage rings is limited by the density modulation possible

Summary

Introduction

In the past two years, there have been a number of papers published addressing the subject of producing THz radiation through the coherent synchrotron radiation (CSR) emission process [1,2,3]. These studies assume a storage ring source; the CSR is produced by coherent synchrotron emission from density variations at wavelengths short compared to the overall bunch length in the storage ring.

Objectives

Results

Conclusion