A Calibration System for Compton Polarimetry at $e^{+}{e}^{-}$ Linear Colliders

Abstract

Polarimetry with permille-level precision is essential for future electron-positron linear colliders. Compton polarimeters can reach negligible statistical uncertainties within seconds of measurement time. The dominating systematic uncertainties originate from the response and alignment of the detector which records the Compton scattered electrons. The robust baseline technology for the Compton polarimeters foreseen at future linear colliders is based on an array of gas Cherenkov detectors read out by photomultipliers. In this paper, we will present a calibration method which promises to monitor nonlinearities in the response of such a detector at the level of a few permille. This method has been implemented in an LED-based calibration system which matches the existing prototype detector. The performance of this calibration system is sufficient to control the corresponding contribution to the total uncertainty on the extracted polarisation to better than $0.1\%$.

27 pages, 17 figures

References in corpus (6)

• ILC Operating Scenarios
• Characterising WIMPs at a future $e^{+}{e}^{-}$ Linear Collider
• Polarimeters and Energy Spectrometers for the ILC Beam Delivery System
• Spin Transport and Polarimetry in the Beam Delivery System of the International Linear Collider
• Simulation Studies and Detector Scenarios for an ILC Polarimeter
• A Quartz Cherenkov Detector for Compton-Polarimetry at Future e+e- Colliders

Cited by in corpus (3)

• Conceptual Design Report for the LUXE Experiment
• Tests of the Standard Model at the International Linear Collider
• Letter of Intent for the LUXE Experiment