English: Artistic view of the 60 m long Common Muon and Proton Apparatus for Structure and Spectroscopy (COMPASS) experiment. COMPASS takes beams from the SPS accelerator at CERN. This beam enters from the lower left and passes through the cylindrical target solenoid. COMPASS is used to study the internal structure of hadrons (composite particles interacting via the strong force) by looking at a property called spin and a phenomenon known as glueballs.
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