ILC Beam Energy Measurement Using Compton Backscattering
Abstract
An alternative approach to measure the ILC beam energy is suggested. Beam electrons interact with monochromatic laser light so that downstream of the interaction point unscattered beam particles (most of them) and strongly collimated Compton backscat-tered electrons and photons exist. After passing a dipole, these particles are divided into non-deflected high energy photons, less deflected beam particles and scattered elec-trons with some larger deflection. Measuring the spatial distributions of these types of particles permits to infer the beam energy with an accuracy 10−4 or better. Since the systematics of the Compton backscattering approach are quite different from those of the BPM-based energy spectrometer, Compton backscattering provides an independent beam energy calibration system with comparable accuracy. The approach has no strict limitations on the beam energy, so it might be experimentally tested at lower energy machines. 1
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