Feasibility of the Spin-Light Polarimetry Technique for Longitudinally Polarized Electron Beams

TL;DR

This paper explores the feasibility of a new spin-light polarimeter that measures synchrotron radiation asymmetry to determine electron beam polarization, supported by simulations and magnetic field analysis.

Contribution

It introduces a novel polarimeter design based on synchrotron radiation asymmetry and evaluates its feasibility through magnetic field effects and GEANT-4 simulations.

Findings

Magnetic field effects are negligible on the polarization measurement.

Ionization chamber response was successfully simulated with GEANT-4.

The proposed polarimeter is feasible for measuring electron beam polarization.

Abstract

A novel polarimeter based on the asymmetry in the spacial distribution of synchrotron radiation will make for a fine addition to the existing M{\o}ller and Compton polarimeters. The spin light polarimeter consists of a set of wiggler magnet along the beam that generate synchrotron radiation. The spacial distribution of synchrotron radiation will be measured by ionization chambers. The up-down (below and above the wiggle) spacial asymmetry in the transverse plain is used to quantify the polarization of the beam. As a part of the design process, effects of a realistic wiggler magnetic field and an extended beam size were studied. The perturbation introduced by these effects was found to be negligible. Lastly, a full fledged GEANT-4 simulation was built to study the response of the ionization chamber.