Author: Weisend, J.
Paper Title Page
WEPPD006 Design of the FRIB Cryomodule 2507
  • M.J. Johnson, M. Barrios, J. Binkowski, S. Bricker, F. Casagrande, A.D. Fox, B.R. Lang, M. Leitner, S.J. Miller, T. Nellis, J.P. Ozelis, X. Rao, J. Weisend, Y. Xu
    FRIB, East Lansing, Michigan, USA
  • D. Arenius, V. Ganni, W.J. Schneider, M. Wiseman
    JLAB, Newport News, Virginia, USA
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
An advanced, modular bottom-supported cryomodule design is described which is highly optimized for mass-production and efficient precision-assembly. The FRIB driver linac uses 4 types of superconducting resonators and 2 solenoid lengths which in turn require 7 individual cryomodule configurations. To meet alignment tolerances a precision-machined bolted cryomodule rail system is described. A novel, kinematic mounting system of the cold mass is introduced which allows for thermal contractions while preserving alignment. A first prototype will incorporate a wire position monitor for alignment verification. The cold alignment structure is supported by composite posts which also function as thermal isolators. The cryogenic system provides separate 2 K and 4.5 K liquid helium lines to cavities and solenoids. Details of the JT valves, heat exchanger, cool-down circuit and junction to cryogenic line will be provided. Transient cool-down was simulated for stresses and buckling failure. A 1100-O Aluminum shield is used as a thermal radiation shield. The paper also describes cryomodule interfaces with the linac tunnel, the RF input cables, and the cryogenic distribution system.
Michigan State University designs and establishes FRIB as a DOE Office of Science National User Facility in support of the mission of the Office of Nuclear Physics.