Design of the ESCAR Injection Beam Line

The design features of the elements of the ESCAR (Experimental Superconducting Accelerator Ring) injection beam line are described. The junction of the proton transport system with the ESCAR injection straight section requires the design of mechanical elements compatible with the 10-11 torr vacuum requirements of the main ring. These elements include a novel septum magnet whose salient design features include a current-carrying septum of tapered thickness, to reduce the overall power requirements, and total enclosure of the magnet coil in a metal can for vacuum compatibility. Other elements are a wire electro-static septum, and several fast-rise "bump magnets". A transition cryopump is designed to seperate the main ring vacuum from the relatively poor 10-6 torr vacuum of the conventional beam transport line. A brief description of the conventional beam transport line from the 50 MeV proton linac, recently installed for Bevatron injection, is also included.