AVS 47th International Symposium
    Vacuum Technology Wednesday Sessions
       Session VT-WeP

Paper VT-WeP10
CESR Phase-III Interaction Region Vacuum Chamber

Wednesday, October 4, 2000, 11:00 am, Room Exhibit Hall C & D

Session: Poster Session
Presenter: Y. He, Cornell University
Authors: Y. He, Cornell University
Y. Li, Cornell University
N.B. Mistry, Cornell University
S. Greenwald, Cornell University
Correspondent: Click to Email
Two 115" long copper UHV chambers for the Cornell Electron Storage Ring (CESR) Interaction Region were fabricated. These chambers are a part of the "Phase-III" upgrade project for the CESR storage ring. They incorporate several novel features including a remotely engaging differentially pumped Viton O-ring sealed UHV flange, two RF shielded bellows joints, and inner stepped masking for synchrotron radiation. The fabrication of these chambers incorporates multi-stage electron beam welding to maintain the strict tolerance required for installation through superconducting and permanent quadrupole magnets. Before final welding, a series of EB welding setup tests were done to work out a welding procedure for optimizing welding parameters and avoiding contamination in the weld zone. This paper will describe the design, fabrication, welding, leak checking, and final UHV performance testing of these chambers.