A quantitative study of systematic uncertainties due to QED corrections in accurate Compton polarimetry experiments
Résumé
Several new high-energy physics accelerators will exploitbeam polarization as a core part of their program. In several casesthe beam polarization needs to be accurately measured with aprecision better than one per-mille. At this level of precision, α$^{3}$ QED corrections must be accounted for. In this paper, weestimate the related correction for the detectors considered forseveral projects as ILC and FCC-ee. Two different techniques toextract the beam polarization are investigated and found to providecomplementary information. The related measurements are dominated bydifferent sources of systematic uncertainties, either related to QEDcorrections or likely to uncontrolled variations of experimentalconditions at the per-mille level. It is found in particular thatthe measurement of the spatial distribution of photons, besidesexperimental challenges, is more sensitive to QED corrections thanthe technique consisting in measuring electrons spatial and energydistribution.
Mots clés
Accelerator Subsystems and Technologies
Beam-line instrumentation (beam position and profile monitors
beam-intensity monitors
bunch length monitors)
Instrumentation for particle accelerators and storage rings - high energy (linear accelerators
synchrotrons)
quantum electrodynamics
correction
beam
polarization
energy
high
photon
spatial distribution
monitoring
accelerator
synchrotron
beam transport
ILC Coll
electron
linear accelerator
FCC-ee
beam position
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