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In the COMPASS Drell-Yan programme a negative pion beam with momentum of 190 GeV/c and intensity up to 108 particles/s is used. The polarizable solid state NH3 target is placed inside the mixing chamber of a large horizontal helium-3/4 dilution cryostat. A large acceptance superconducting solenoid magnet with a nominal field of 2.5 T is used to polarize the protons by microwave pumping around electron spin frequency. Due to the space needed by the hadron absorber the target platform had to be moved 2.3 m upstream from deep inelastic scattering position of run 2011. The upgrade of the target system and the initial commissioning are presented.

Large COMPASS polarized solid state target for Drell-Yan physics