Design of the SNS Cryomodule

Download or read book Design of the SNS Cryomodule written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Plans are underway to develop a medium beta (0.61) and a high beta (0.81) cryomodule for the super-conducting portion of the Spallation Neutron Source. This paper describes the design of these cryomodules that provide a significant portion of the total acceleration to the proton beam. The design minimizes the effect of losses on cavity performance by preserving cavity cleanliness, maintaining high vacuum and shielding the cavity from the earth's magnetic field. A modal analysis was performed to maintain resonance by minimizing cavity microphonics and provide cavity tuning. The cryomodule design optimizes the cryostat heat load to the refrigerator on the primary (2 K), secondary (5 K) and shield (50 K) circuits and facilitates production of multiple modules (thirty-two maximum) at a reasonable cost. The paper describes the two types of cavities, the helium vessel, the tuner, the magnetic shields, the thermal shield, the power couplers, the space frame, the vacuum tank and the end cans t hat make up the medium and high beta cryomodules.