Status of non-destructive bunch length measurement based on coherent Cherenkov radiation

TL;DR

This paper discusses the development and initial observations of a non-destructive method for measuring electron bunch length using coherent Cherenkov radiation from a dielectric crystal, with potential applications in linear accelerators.

Contribution

It introduces a novel experimental approach for non-destructive bunch length measurement based on coherent Cherenkov radiation from a dielectric crystal, including design and initial results.

Findings

First angular distribution observations of coherent Cherenkov radiation

Successful experimental setup demonstration

Potential for non-destructive bunch length diagnostics

Abstract

As a novel non-destructive bunch length diagnostic of the electron beam, an experimental observation of the coherent Cherenkov radiation generated from a dielectric caesium iodide crystal with large spectral dispersion was proposed for the 30MeV femtosecond linear accelerator at Shanghai Institute of Applied Physics (SINAP). In this paper, the theoretical design, the experimental setup, the terahertz optics, the first angular distribution observations of the coherent Cherenkov radiation, and the future plans are presented.