Future of COMPASS experiment

The COMPASS physics program covers two domains, 1/ the study of nucleon spin structure using a muon beam, which includes the measurement of the gluon contribution to the nucleon spin and of the transversely polarized parton distributions; 2/ the hadron spectroscopy using hadron beams, in particular the study of charmed hadrons, hadron polarisabilities and exotic hadrons. The COMPASS spectrometer has been commissioned in 2001 and the physics data taking has started in 2002. We discuss here the plans for the future data taking and for the set‐up improvements.