TESLA Polarimeters

TL;DR

This paper discusses the design and expected performance of high-energy Compton beam polarimeters for TESLA, aiming for precise polarization measurements to enhance collider experiments.

Contribution

It introduces a novel polarimeter setup aligned with TESLA's collision axis, utilizing a laser system similar to DESY's for fast, accurate polarization measurements.

Findings

Expected polarization measurement precision of 0.5%.

Suitable beamline segment identified for polarimetry.

Multiple operating modes for calibration and measurement.

Abstract

We describe a study of high-energy Compton beam polarimeters for the future e+e- linear collider machine TESLA. A segment of the beam delivery system has been identified, which is aligned with the e+e- collision axis and which has a suitable configuration for high-quality beam polarization measurements. The laser envisaged for the polarimeter is similar to an existing facility at DESY. It delivers very short pulses in the 10 ps, 10-100uJ regime and operates with a pattern that matches the pulse and bunch structure of TESLA. This will permit very fast and accurate measurements and an expeditious tune-up of the spin manipulators at the low-energy end of the linac. Electron detection in the multi-event regime will be the principle operating mode of the polarimeter. Other possible operating modes include photon detection and single-event detection for calibration purposes. We expect an overall precision of dP/P=0.5% for the measurement of the beam polarization.