SNS* 2.1K cold box turn-down studies

F. Casagrande, P. Gurd, D. Hatfield, M. Howell, H. Strong, D. Arenius, V. Ganni, P. Knudsen, J. Creel

Research output: Contribution to conferencePaperpeer-review

6 Scopus citations

Abstract

The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory is nearing completion. The cold section of the Linac consists of 81 superconducting radio frequency cavities cooled to 2.1K by a 2400 watt cryogenic refrigeration system. The 2.1K cold box consists of four stages of centrifugal compressors with LN2-cooled variable speed electric motors and magnetic bearings. The cryogenic system successfully supported the Linac beam commissioning at both 4.2K and 2.1K and has been fully operational since June 2005. This paper describes the control principles utilized and the experimental results obtained for the SNS cold compressors turn-down capability to about 30% of the design flow, and possible limitation of the frequency-dependent power factor of the cold compressor electric motors, which was measured for the first time during commissioning. These results helped to support the operation of the Linac over a very broad and stable cold compressor operating flow range (refrigeration capacity) and pressure. This in turn helped to optimise the cryogenic system operating parameters, minimizing the utilities and improving system reliability and availability.

Original languageEnglish
Pages514-516
Number of pages3
StatePublished - 2006
Event10th European Particle Accelerator Conference, EPAC 2006 - Edinburgh, United Kingdom
Duration: Jun 26 2006Jun 30 2006

Conference

Conference10th European Particle Accelerator Conference, EPAC 2006
Country/TerritoryUnited Kingdom
CityEdinburgh
Period06/26/0606/30/06

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