We describe the performance of a photon detector based on the Gas Electron Multiplier (GEM). With a CsI photocathode deposited on the first GEM in a cascade, the device permits to efficiently detect and localize single photoelectrons produced by UV photons between the CsI threshold (~6.2 eV) and the quartz window cutoff (~7.5 eV). The single-photon position accuracy achieved, ~55 µm rms, and the excellent multi-photon resolution makes it well suited for Cherenkov Ring Imaging applications
Future requirements on higher beam intensity and brightness will need an upgrade of the present CERN accelerator chain. Linac4 will be an essential part of the upgrade of the proton accelerator facility. The source for this H(-) linac will be based on a copy of the DESY rf driven H(-) source. New possible radio frequency quadrupole alternatives (with different injection energies) and a pressing linac schedule made it necessary to develop a flexible two-source design.
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