SPIRAL2 Cryogenic System Thermodynamic Behavior Prediction Through Dynamic Modeling

Abstract : 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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Adrien Vassal, Pierre-Emmanuel Bernaudin, Patrick Bonnay, François Bonne, Adnan Ghribi, et al.. SPIRAL2 Cryogenic System Thermodynamic Behavior Prediction Through Dynamic Modeling. 29th International Linear Accelerator Conference, Sep 2018, Beijing, China. pp.TUPO019, ⟨10.18429/JACoW-LINAC2018-TUPO019⟩. ⟨hal-02008862⟩



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