Cherenkov detector prototype for ILC polarimetry

Precise knowledge of all beam parameters is crucial to fully exploit the physics potential of the International Linear Collider (ILC). A sufficiently accurate measurement of the beam polarisation can only be achieved using dedicated high energy Compton polarimeters combined with well-designed Cherenkov detectors. The requirements have been evaluated and a suitable Cherenkov detector prototype has been designed, simulated and constructed accordingly. This prototype allows nearly all aspects of the final detector to be studied and has been operated successfully in a testbeam of which first results are presented as well.