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

Understand

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.