Abstract
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.
Highlights
Fermi National Accelerator Laboratory (Fermilab) is fabricating cryomodules for the Linac Coherent Light Source II (LCLS-II) located at Stanford Linear Accelerator (SLAC)
By utilizing Superconducting Radio Frequency (SRF) cavities in the accelerator instead of normal conducting radio frequency cavities, the X-ray pulse repletion rate is expected to increase from 120 times per second in the LCLS to 1 million pulses per second in the LCLS-II at 4 GeV[1]
LCLS-II Cryomodules are tested on the Cryomodule Test Stand (CMTS) in Fermilab’s Cryomodule Test Facility (CMTF) before installation in LCLS-II tunnel
Summary
Fermi National Accelerator Laboratory (Fermilab) is fabricating cryomodules for the Linac Coherent Light Source II (LCLS-II) located at SLAC. This paper focus on the operational experience gained from testing the three cryomoduless including: slow cooldown from 300 K to 100 K, fast cooldown from 50 K to 9.2 K, operation at 2.0 K with static heat load, and operation at 2.0 K with additional SRF and heater power (RF compensation mode).
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