Vacuum System Design of the Third Generation Synchrotron Radiation Source PETRA III

Böspflug, R.1; Boster, J.1; Giesske, W.1; Keese, D.1; Köhler, R.1; Mildner, N.1; Nagorny, B.1; Naujoks, U.1; Remde, H.1; Schulz, E.1; Seidel, M.2; Tiessen, J.1; Wedekind, H.P.1; Zapfe, K.1 1Germany; 2Switzerland

Within the next two years the 2.3 km long storage ring PETRA will be rebuild into one of the most brilliant x-ray sources worldwide (PETRA III). The large bending radius and the use of damping wigglers allow to achieve very small beam emittances and extrem brilliant x-ray beams. In this paper we describe the design and the expected performance of the vacuum system for the storage ring. It consists of standard arc sections, an experimental octant which is equipped with undulators and several straight sections that include the damping wigglers. Because of the long length of the storage ring a cost effectiv solution has to be found. Besides the requirement to quickly provide acceptable residual gas pressures the technical challenges of the system include the provision of high thermal stability with respect to magnets and beam position monitors, and the design of thin walled insertion device chambers as well as high power synchrotron radiation absorbers.

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