Replacement monochromator cryocoolers for NE-CAT

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Project Summary The Northeast Collaborative Access Team (NE-CAT) operates two undulator beamlines (24-ID- C and 24-ID-E) at the Advanced Photon Source. Both beamlines are equipped with MD2 microdiffractometers, cryocooling systems, sample automounters, and pixel array detectors. Access is provided to a large user community with 546 unique users performing 657 data collection trips in calendar year 2021 (3003 total user visits). The NE-CAT beamlines collect data resulting in approximately 180 publications and over 400 PDB deposits per year. Both NE-CAT beamlines employ FMB Oxford liquid nitrogen cryocoolers to maintain the temperature of their silicon monochromator crystals at an operational temperature of 90 K. The current cryocoolers were installed when the beamlines were originally constructed and are now approximately 15 years old. Over their many years of service, the FMB Oxford cryocoolers have been dependable and only required routine maintenance and minor repairs to their control systems. Anticipating their eventual failure and to reduce beam vibrations, we propose to replace both cryocoolers with FMB Oxford Cryocooler XV systems. The FMB Oxford Cryocooler XV is a proven design that will provide many years of dependable service while also improving beam stability by reducing liquid nitrogen flow-induced vibrations of the silicon monochromator crystals.