Precision Polarimetry at the International Linear Collider

Details Precision Polarimetry at the International Linear Collider Precision Polarimetry at the International Linear Collider

2008-09-26

arxiv.org/abs/0809.4485v2

Physics

Instrumentation and Detectors

3 pages, 4 figures, proceedings to poster (ICHEP'08) Version change due to cosmetic changes made by the ICHEP08 Proceedings Te

Scientific paper

The International Linear Collider (ILC) will collide polarised electrons and positrons at beam energies of 45.6 GeV to 250 GeV and optionally up to 500 GeV. To fully exploit the physics potential of this machine, not only the luminosity and beam energy have to be known precisely, but also the polarisation of the particles has to be measured with an unprecedented precision of dP/P ~ 0.25% for both beams. An overall concept of high precision polarisation measurements at high beam energies will be presented. The focus will be on the polarimeters (up- and downstream of the e+e- interaction point) embedded in the ILC beam delivery system. Some challenges concerning the design of the Compton spectrometers and the appropriate Cherenkov detectors for each polarimeter are discussed. Detailed studies of photodetectors and their readout electronics are presented focusing specifically on the linearity of the device, since this is expected to be the limiting factor on the precision of the polarisation measurement at the ILC.

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