Compton Polarimetry at a TEV Collider

TL;DR

This paper discusses the design and potential accuracy of a Compton polarimeter for measuring electron beam polarization at a 1 TeV Linear Collider, emphasizing the importance of precise polarization measurements for collider experiments.

Contribution

It presents design considerations and feasibility analysis for a Compton polarimeter capable of 1% accuracy in a high-energy collider environment.

Findings

Parasitic polarization measurements with 1% accuracy are feasible.

Design challenges are similar for electron-positron and electron-electron modes.

Beam disruption complicates polarization measurement in electron-electron mode.

Abstract

An electron beam polarization of 80% or greater will be a key feature of a 1 TeV Linear Collider. Accurate measurements of the beam polarization will therefore be needed. We discuss design considerations and capabilities for a Compton-scattering polarimeter located in the extraction line from the Interaction Point. Polarization measurements with 1% accuracy taken parasitic to collision data look feasible, but detailed simulations are needed. Polarimeter design issues are similar for both electron-positron and electron-electron collider modes, though beam disruption creates more difficulties for the electron-electron mode.