EUDET-Memo-2007-11 EUDET Test Beams at DESY

This document is motivated by the need of clarification of possible interference between the operation of PETRA III and the DESY test beam. The document is intended to describe shortly the DESY test beam performance and the expected conditions after the start-up of PETRA III. We evaluate the possible impact of PE-TRA III on the availability, the intensity, and the energy of the electrons/positrons provided to the test beam lines at DESY II. In the interest of a very large com-munity of test beam users we intend to identify, and eventually resolve, possible conflicts between the two main programs of the DESY II machine, namely the filling of PETRA III and DORIS and the beam delivery to test beam facilities