Cryomodules and cryogenics
Paper Title Page
FRIB Cavities and Cryomodule Production  
  • C. Compton
    FRIB, East Lansing, Michigan, USA
  FRIB is producing 49 cryomodules (CMs) with six types (four types of accelerating CMs and two types of matching CMs). Four types of SRF cavities are installed; β = 0.041 Quarter Wave Resonator (QWR), β = 0.085 QWR, β = 0.29 Half Wave Resonator (HWR), and β = 0.53 HWR. The superconducting focusing solenoids and diagnostics are installed in the CMs. By the end of October, 2017, 13 CMs were integrated tested and have been placed at the FRIB tunnel. In addition, 3 CMs were assembled, and 7 cold masses were completed. The remaining 26 CMs production is on track. Challenges overcome during the course of CMs development and production were presented with the updated status.  
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TUPO019 SPIRAL2 Cryogenic System Thermodynamic Behavior Prediction Through Dynamic Modeling 366
  • A.V. Vassal, P.-E. Bernaudin, A. Ghribi
    GANIL, Caen, France
  • P.-E. Bernaudin
    CEA/DSM/IRFU, France
  • P. Bonnay, F. Bonne
    CEA/INAC, Grenoble Cedex 9, France
  • F. Millet
    CEA, Grenoble, France
  SPIRAL 2 (Caen, France) is a state of the art superconducting linear accelerator composed of 26 quarter wave accelerating cavities. Each cavity is plunged in a liquid helium bath at 4.4 K itself surrounded by a thermal shield at 70 K. In this paper, a dynamic model of the cryogenic systemof the LINAC is proposed. Thismodel simulates the dynamic behaviour of the 19 cryomodules and their respective valves box connected through the cryodistribution. Model accuracy is evaluated through a comparison between simulation and experimental data. Using the model we should be able to predict the behaviour of the cryogenic system for different beam operating conditions of the accelerator. The model also highlights the link between the cryogenic system and the cavity RF losses through a dynamic estimator of those RF losses in the cavity walls. The latter could be used as a rough estimator of the quality factor of a cavity.  
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About • paper received ※ 13 September 2018      issue date ※ 18 January 2019  
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