Process simulations for the LCLS-II cryogenic systems

Cryogenic Engineering Conference 2017

材料科学;物理学

Ravindranath, V.^1 ; Bai, H.^1 ; Heloin, V.^1 ; Fauve, E.^1 ; Pflueckhahn, D.^1 ; Peterson, T.^1 ; Arenius, D.^2 ; Bevins, M.^2 ; Scanlon, C.^2 ; Than, R.^3 ; Hays, G.^1 ; Ross, M.^1

SLAC National Accelerator Lab, 2575 Sand Hill Road, Menlo Park

CA

94025, United States^1

Jefferson Lab, 1200 Jefferson Avenue, Newport News

VA

23606, United States^2

Brookhaven National Lab, PO Box 5000, Upton

NY

11973, United States^3

关键词: Cold compressors;    Continuous waves;    Cryogenic cooling;    Cryogenic process;    Electron linear accelerator;    Linac Coherent Light Source;    Process simulations;    Refrigeration capacity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012106/pdf
DOI  :  10.1088/1757-899X/278/1/012106

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Linac Coherent Light Source II (LCLS-II), a 4 GeV continuous-wave (CW) superconducting electron linear accelerator, is to be constructed in the existing two mile Linac facility at the SLAC National Accelerator Laboratory. The first light from the new facility is scheduled to be in 2020. The LCLS-II Linac consists of thirty-five 1.3 GHz and two 3.9 GHz superconducting cryomodules. The Linac cryomodules require cryogenic cooling for the super-conducting niobium cavities at 2.0 K, low temperature thermal intercept at 5.5-7.5 K, and a thermal shield at 35-55 K. The equivalent 4.5 K refrigeration capacity needed for the Linac operations range from a minimum of 11 kW to a maximum of 24 kW. Two cryogenic plants with 18 kW of equivalent 4.5 K refrigeration capacity will be used for supporting the Linac cryogenic cooling requirements. The cryogenic plants are based on the Jefferson Lab's CHL-II cryogenic plant design which uses the "Floating Pressure" design to support a wide variation in the cooling load. In this paper, the cryogenic process for the integrated LCLS-II cryogenic system and the process simulation for a 4.5 K cryoplant in combination with a 2 K cold compressor box, and the Linac cryomodules are described.