Speaker
Description
A conceptual design for the new conduction-cooled niobium-tin (Nb3Sn) superconducting undulator (SCU) cryostat is underway. The cryostat houses Nb3Sn SCU magnets up to 1.5 m in length and is a modification of the niobium–titanium (Nb-Ti) SCU cryostat that operated in the previous Advanced Photon Source (APS) storage ring. Cooling is provided by four cryocoolers arranged in two thermal circuits. The Nb3Sn magnets are conduction-cooled by the second stages of all four 4-K cryocoolers via 4-K copper busbars and arrays of flexible thermal links. A thermal shield and the warm sections of the current leads are cooled by the first stages of all four cryocoolers. The room-temperature guide tube for the magnetic measurement system is positioned between the SCU magnets and is thermally isolated from the Nb3Sn SCUs at ~4 K. An ANSYS model has been developed based on this conceptual design to include all thermal circuits. This paper presents a thermal and mechanical analysis of the new conduction-cooled cryostat under static and dynamic heat loads.
Funding Agency
Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
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