The beam energy calibration system for the BEPC-II collider

TL;DR

This paper proposes a beam energy calibration system for the BEPC-II collider using Compton backscattering and HPGe detectors, achieving high-precision measurements of electron or positron beam energy.

Contribution

It introduces a novel calibration system based on laser Compton backscattering and high-purity germanium detectors for precise beam energy measurement.

Findings

Achieves relative accuracy of about 3×10^-5 in beam energy determination.

Utilizes Compton backscattering of CO2 laser radiation.

Employs HPGe detector for accurate energy spectrum measurement.

Abstract

This document contains a proposal of the BEPC-II collider beam energy calibration system (IHEP, Beijing). The system is based on Compton backscattering of carbon dioxide laser radiation, producing a beam of high energy photons. Their energy spectrum is then accurately measured by HPGe detector. The high-energy spectrum edge will allow to determine the average electron or positron beam energy with relative accuracy about 3x10^-5.