APT cryomodule assembly process and mockup model

Abstract

The cryomodule for the APT β=0.64 high energy accelerator incorporates either two or three RF cavities, two sets of magnetic shields, one active heat shield, multilayer insulation blankets, cryogenic plumbing for the shields and cavities, power couplers, cavity spokes and cavity frequency tuners. Maintaining cavity cleanliness is the most important aspect of the cryomodule assembly. The clean assembly of the cryomodule is done in a class 100 clean room. The final assembly, such as tungsten inert gas welding used to join the cryogenic plumbing, is done in a controlled environment. To address the assembly issues early in the design process, a full-scale mock-up of the entire cryomodule was fabricated. In this paper we will also describe the assembly process, and illustrate how the mock-up facilitated the procedures.