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Modeling of RHIC insulating vacuum for system pumpdown characteristics [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1993.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
10 pages : digital, PDF file
Additional Creators
Brookhaven National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
This paper presents a model for predicting the pumpdown characteristics of a 480 m RHIC (Relativistic Heavy Ion Collider) vacuum cryostat. The longitudinal and transverse conductances of a typical cryostat were calculated. A voltage analogue of these conductances was constructed for room temperature conditions. The total longitudinal conductance of a room temperature cryostat was thereby achieved. This conductance was then used to calculate the diameter of an equivalent long outgassing tube, having more convenient analytical expressions for pressure profiles when pumped. The equivalent of a unit outgassing rate for this tube was obtained using previously published MLI (multi-layer insulation) outgassing data. With this model one is then able to predict a cryostat pumpdown rate as a function of the location and size of roughing pumps.
Report Numbers
E 1.99:bnl--49181
bnl--49181
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
06/01/1993.
"bnl--49181"
"DE93017607"
Todd, R.J.; Welch, K.M.; Pate, D.J.
Type of Report and Period Covered Note
Topical; 06/01/1993 - 06/01/1993
Funding Information
AC02-76CH00016
View MARC record | catkey: 14691587