Coherent Cherenkov radiation as an intense THz source

V Bleko,A Konkov,P Karataev,T Vaughan,K Kruchinin,A Potylitsyn,G Naumenko

doi:10.1088/1742-6596/732/1/012006

Abstract

Diffraction and Cherenkov radiation of relativistic electrons from a dielectric target has been proposed as mechanism for production of intense terahertz (THz) radiation. The use of an extremely short high-energy electron beam of a 4th generation light source (X-ray free electron laser) appears to be very promising. A moderate power from the electron beam can be extracted and converted into THz radiation with nearly zero absorption losses. The initial experiment on THz observation will be performed at CLARA/VELA FEL test facility in the UK to demonstrate the principle to a wider community and to develop the radiator prototype. In this paper, we present our theoretical predictions (based on the approach of polarization currents), which provides the basis for interpreting the future experimental measurements. We will also present our hardware design and discuss a plan of the future experiment.

Highlights

The THz frequency of electromagnetic radiation always ranges from 10 – 0.1 THz and corresponds to the wavelength range from 30 μm to 3 mm [1]
We propose a scheme to generated intense THz radiation beams using the Cherenkov radiation (ChR) mechanism at CLARA (Compact Linear Accelerator for Research and Application) facility in Daresbury Laboratory (UK) with intermediate energy of 50 MeV
ChR maximum intensity corresponds to the angle of θCh = 43◦ with respect to the particle trajectory determined by the equation (4)

Summary

Introduction

The THz frequency of electromagnetic radiation always ranges from 10 – 0.1 THz and corresponds to the wavelength range from 30 μm to 3 mm [1]. We propose a scheme to generated intense THz radiation beams using the ChR mechanism at CLARA (Compact Linear Accelerator for Research and Application) facility in Daresbury Laboratory (UK) with intermediate energy of 50 MeV. 2. Theoretical background In this paper we used polarization current method enabling us to calculate polarization radiation characteristics for conditions close to the experimental ones.

Results

Conclusion