LUMINOSITY CONSIDERATIONS FOR INTERNAL AND EXTERNAL EXPERIMENTS AT COSY

The future physics program at the Cooler-Synchrotron COSY [1,2] in Julich requires intense beams to provide high luminosities up to 10 32 cm -2 s -1 for internal and external experiments [3]. In 2003 the number of unpolarized protons could be significantly increased. This was achieved by careful study and adjustment of all subsystems in the accelerator chain of COSY. The intensity for polarized beams in COSY is typically one order of magnitude lower compared to the one for unpolarized beams. In this paper, luminosity considerations for polarized and unpolarized beams at COSY are presented taking different machine cycles and operation modes for internal and external experiments into account.