Operational experience from LCLS-II cryomodule testing

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 temp...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2017-12, Vol.278 (1), p.12187
Main Authors: Wang, R, Hansen, B, White, M, Hurd, J, Al Atassi, O, Bossert, R, Pei, L, Klebaner, A, Makara, J, Theilacker, J, Kaluzny, J, Wu, G, Harms, E
Format: Article
Language:English
Subjects:
Circuits
Coherent light
Compressors
Light sources
Liquid levels
Niobium
Slope gradients
Superconductivity
Test facilities
Test stands
Transition temperature
Vacuum pumps
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Summary: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.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/278/1/012187