Proposed warm bore beam-pipe assemblies and associated vacuum systems for the worlds two largest particle detectors

Abstract

In Ellis County, 35 miles south of Dallas, Texas, the Superconducting Super Collider is being constructed. The dominant element is the 54-mile underground collider ring, which is oval in shape with a major axis of 19 miles and a minor axis of 15 miles. When completed, opposing beams of protons at maximum energies of 20 TeV will be brought into collision at each of four experimental areas. This paper describes the long warm beam pipe assemblies and vacuum systems proposed for the two massive detectors [Gammas Electrons, and Muons (GEM) Collaboration and Solenoidal Dector Collaboration (SDC)] which will occupy the two underground experimental halls (each 300 ft long and 100×180 ft cross section) situated on the east side of the collider ring. The driving factors which influence the beam pipe geometry and vacuum system are discussed together with presentations of graphic average pressure profiles of the interaction regions. Pressure requirements are identified and the influence of the synchrotron-radiation-induced gas desorption, ion-induced pressure instability, and electron multipactoring are examined.