Operational experience from LCLS-II cryomodule testing

Cryogenic Engineering Conference 2017

材料科学;物理学

Wang, R.^1 ; Hansen, B.^1 ; White, M.^1 ; Hurd, J.^1 ; Al Atassi, O.^1 ; Bossert, R.^1 ; Pei, L.^1 ; Klebaner, A.^1 ; Makara, J.^1 ; Theilacker, J.^1 ; Kaluzny, J.^1 ; Wu, G.^1 ; Harms, E.^1

Fermi National Accelerator Laboratory, MS 347, P.O. Box 500, Batavia

IL

60510, United States^1

关键词: Cold compressors;    Control valves;    Linac Coherent Light Source;    Operational experience;    Power compensation;    Pumping configurations;    Stable liquids;    Superconducting radio frequency;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012187/pdf
DOI  :  10.1088/1757-899X/278/1/012187

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This paper describes the initial operational experience gained from testing Linac Coherent Light Source II (LCLS-II) cryomodules at Fermilab's Cryomodule Test Facility (CMTF). Strategies for a controlled slow cooldown to 100 K and a fast cooldown past the niobium superconducting transition temperature of 9.2 K will be described. The test stand for the cryomodules at CMTF is sloped to match gradient in the LCLS-II tunnel at Stanford Linear Accelerator (SLAC) laboratory, which adds an additional challenge to stable liquid level control. Control valve regulation, Superconducting Radio-Frequency (SRF) power compensation, and other methods of stabilizing liquid level and pressure in the cryomodule 2.0 K SRF cavity circuit will be discussed. Several different pumping configurations using cold compressors and warm vacuum pumps have been used on the cryomodule 2.0 K return line and the associated results will be described.