Thermal Analysis of a Superconducting Undulator Cryostat for the APS Upgrade

Conference · 01 January 2020

DOI:https://doi.org/10.1088/1757-899X/755/1/012125· OSTI ID:1798825

Shiroyanagi, Y.; Anliker, E.; Hasse, Q.; Ivanyushenkov, Y.; Kasa, M.; Fuerst, Joel

The Advanced Photon Source Upgrade includes four 4.8-m-long superconducting undulator (SCU) cryostats, each containing two planar undulator NbTi magnets up to 1.9 m long. The cooling is provided by six cryocoolers arranged in three thermal circuits. The magnets are indirectly cooled with LHe penetrating through channels in the magnet cores. This 4 K circuit, which also includes a LHe tank, is cooled by five 4 K cryocooler 2nd stages. A beam vacuum, which is thermally isolated from the magnets, is cooled by one 10 K cryocooler 2nd stage. A thermal shield and warm parts of current leads are cooled by the 1st stages of all six cryocoolers. This paper presents an ANSYS-based thermal analysis of the new SCU cryostat including all thermal circuits. The benchmarked thermal conductance between the cryocooler cold heads and the LHe tank are used in the calculations as well as the measured cryocooler load lines. The model predicts temperatures in the system, total 4 K heat loads, and excess cooling power for various operational modes of the undulator.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1798825
• Resource Relation: Conference: 2019 Cryogenic Engineering Conference and International Cryogenic Materials Conference, 07/21/19 - 07/25/19, Hartford, CT, US
• Country of Publication: United States
• Language: English