• R. Stassen, F.J. Etzkorn, R. Maier, D. Prasuhn, H. Stockhorst
  FZJ, Jülich
• L. Thorndahl
  CERN, Geneva

The COoler SYnchrotron COSY at the Forschungszentrum Jülich is operating now since 1992. Up to 5*10¹⁰ protons can be delivered over a momentum range of 600 MeV/c to 3.6 GeV/c. The prototype of the HESR barrier bucket cavity was installed into COSY and many measurements have been performed. Especially the co-operation of barrier bucket with stochastic cooling has been studied. During the measurements the internal WASA Pellet target was available which is similar to the PANDA target at the HESR. A 1.2m long cryo-tank has been designed and installed to measure the sensitivities of new pickup structures for the HESR stochastic cooling system. Tank design and structures arrangement correspond to the projected HESR stochastic cooling layout. The recent results will be presented.