TL;DR: The COMPASS Collaboration as discussed by the authors is a large-scale project to study the structure and spectroscopy of hadrons by a series of experiments with muon and hadron beams in the energy range of 100-200 GeV.
Abstract: The COMPASS Collaboration brings together about 220 physicists from 27 institutes from Europe, Russia, Japan and India. The goal is to study the structure and spectroscopy of hadrons by a series of experiments with muon and hadron beams in the energy range of 100–200 GeV. The experiment [1] is located at the M2 beam line at the CERN SPS. In 1995 the project started out with two letters of intent which were merged into a common proposal and which was fully approved in September 1998. The first construction phase ended with a commissioning run in 2001. In this article the results of this commissioning run are presented and an outlook on the 2002 run is given.
TL;DR: The Small Area Tracking System of the COMPASS experiment at CERN includes a set of 20 large area, fast position-sensitive Gas Electron Multiplier detectors, designed to reliably operate in the harsh radiation environment of the experiment as mentioned in this paper.
Abstract: The Small Area Tracking system of the COMPASS experiment at CERN includes a set of 20 large area, fast position-sensitive Gas Electron Multiplier detectors, designed to reliably operate in the harsh radiation environment of the experiment. We describe in detail the design, choice of materials, assembly procedures and quality controls used to manufacture the devices. The test procedure in the laboratory, the performance in test beams and in the initial commissioning phase in the experiment are presented and discussed.
TL;DR: In this paper, the COMPASS experiment at the CERN muon beam was used to investigate the gluon polarisation of the nucleon using polarised deep inelastic scattering and correlated high pT hadron pairs.
Abstract: To investigate the gluon polarisation of the nucleon the COMPASS experiment is being set up at the CERN muon beam. Using polarised deep inelastic scattering the experiment exploits open charm production and correlated high pT hadron pairs to tag photon gluon fusion. The expected precision for the measured asymmetries will allow a significant determination of the gluon polarisation for x
g≈0.1.
TL;DR: In this article, a multi-purpose, high rate capable TDC with digitisation width of 60 ps has been developed for the COMPASS experiment and the integration into the readout system and the flexible input of the CATCH readout driver is presented.
Abstract: In the scope of the COMPASS experiment a multi-purpose, high rate capable TDC with digitisation width of 60 ps has been developed. The integration into the readout system and the flexible input of the CATCH readout driver is presented.