The Cherenkov detector for proton Flux Measurements (CpFM).
The Cherenkov detector for proton Flux Measurements (CpFM) developed in the frame of the UA9 collaboration is presented. The UA9 experiment at CERN-SPS is investigating the feasibility of crystal-assisted collimation for hadronic beams. The CpFM detector has been conceived to count the protons deflected by the crystal with a precision of 5% per 100 incoming particles. It is a radiation resistant in-vacuum detector consisting of a fused silica radiator bar coupled to a bundle of quartz fibers guiding the light to a photomultiplier (PMT). The readout of the PMT is realized by an ultra-fast (3.2 GHz) analog memory, the WaveCatcher. Another CpFM with a different acquisition chain is now under development to characterize the harmonic content of an extracted beam.