Interaction region vacuum system design at the PEP-II B Factory

Author

Bertolini, L. ; Alford, O. ; Duffy, P. ; Holmes, R. ; Mullins, L. ; Ng, C. ; Sullivan, M.

Author_Institution

Lawrence Livermore Nat. Lab., California Univ., Livermore, CA, USA

Volume

3

fYear

1997

fDate

12-16 May 1997

Firstpage

3562

Abstract

The interaction region vacuum system in the PEP-II B-Factory at SLAC must produce average pressures in the 10^-10 Torr range. Low beamline pressures will minimize the background radiation encountered by the BaBar Detector. A combination of copper and stainless steel vacuum chambers with continuous antechambers are used to make up the beam tubes. Linear non-evaporable getter (NEG) pumps are used to produce distributed pumping along the length of these beam tubes. High conductance “microwave” type screens provide RF shields between the beam aperture and the NEG pumps. In this paper the design features of the beam tubes, NEG pumps, and RF pump screens are described and the vacuum and impedance analyses conducted in support of the design are discussed

Keywords

accelerator RF systems; colliding beam accelerators; electron accelerators; getters; storage rings; vacuum apparatus; vacuum pumps; 1E-10 torr; Cu; PEP-II B-Factory; RF shields; beam aperture; continuous antechambers; distributed pumping; interaction region vacuum system; linear nonevaporable getter pumps; microwave type screens; vacuum chambers; Copper; Electron tubes; Gettering; Laser excitation; Production facilities; Radiation detectors; Radio frequency; Steel; Structural beams; Vacuum systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.753274

Filename

753274