angles. In addition, the first stage holds a Ring-Imaging CHerenkov detector ("RICH"), able to distinguish pions and kaons between 10 and 50 GeV. The following detector types for measuring charged particles are used: MicroMegas, micro mesh gas detector, Pixelised MicroMegas, GEMs, gaseous electron multiplier, Pixelised GEMs, Drift chambers, Straws , SciFis, scintillating fibre stations, MWPC, multi wire proportional chambers, Hodoscopes, scintillator counter used for triggering on scattered muons. Neutral particles, i.e. photons are detected with electro-magnetic calorimeters. The energy of produced hadrons are determined with hadronic calorimeters. See also List of Super Proton Synchrotron experiments External links Collaboration Official website COMPASS experimental setup "COMPASS homes in on the nucleon spin", The CERN Courier, 25 July 2006 (accessed 26 June 2008). CERN-NA-058 (COMPASS) experiment record on INSPIRE-HEP CERN experiments Particle experiments Fixed-target experiments