Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Instrumentierung

HK 27.9: Talk

Tuesday, March 18, 2014, 18:45–19:00, HZ 8

Commissioning and performance studies of a proton recoil detector at the COMPASS-II experiment — •Philipp Jörg, Maximilian Büchele, Horst Fischer, Matthias Gorzellik, Tobias Grussenmeyer, Florian Herrmann, Kay Königsmann, Paul Kremser, and Sebastian Schopferer — for the COMPASS collaboration, Physikalisches Institut, Albert-Ludwigs-Universität Freiburg

The COMPASS-II experiment is a fixed target experiment situated at CERN. A tertiary myon beam from the SPS scattered of protons from a liquid hydrogen target is used to measure Deeply Virtual Compton Scattering (DVCS) and Hard Exclusive Meson Production (HEMP). These processes offer a unique way to determine Generalized Parton Distributions, which are related to the total angular momentum of quarks, antiquarks and gluons in the nucleon by Ji’s Sume Rule.

One of the major parts of the COMPASS-II upgrade is the CAMERA detector. CAMERA is a proton recoil detector surrounding the COMPASS-II liquid hydrogen target. Its purpose is to measure the recoiled target proton in DVCS and HEMP reactions and viz to act as a veto to ensure the exclusivity of the measurement.

The talk will give an outline of the detector and its readout electronics. It is focused on the commissioning and performance of the CAMERA detector and will give a brief insight into the ongoing DVCS analysis. Supported by BMBF and EU FP7 (Grant Agreement 283286).