Spiral 2 Cryogenic System for The Superconducting LINAC

A. Ghribi (1) , P.E. Bernaudin (1) , Y. Bert (2) , C. Commeaux (2) , M. Houeto (1) , G. Lescalié (1)

1 GANIL - Grand Accélérateur National d'Ions Lourds
2 HELTECH

SPIRAL 2 is a rare isotope accelerator dedicated to the production of high intensity beams (E = 40MeV , I = 5mA). The driver is a linear accelerator (LINAC) that uses bulk Niobium made quarter wave RF cavities. 19 cryomodules inclose one or two cavities respectively for the low and the high energy sections. To supply the 1300W at 4:2K required to cool down the LINAC, a cryogenic system has been set up. The heart of the latter is a 3 turbines geared HELIAL®LF (ALAT) cold box that delivers both the liquid helium for the cavities and the 60K Helium gaz for the thermal screens. 19 valve-boxes insure cryogenic uid distribution and management. Key issues like cool down speed or cavity RF frequency stability are closely linked to the cryogenic system management. To overcome these issues, modelling and simulation efforts are being undertaken prior to the first cool down trials. In this paper, we present a status update of the Spiral 2 cryogenic system and the cool down strategy considered for its commissioning.

Domaines: Physique des accélérateurs [physics.acc-ph]

A. Ghribi, P.E. Bernaudin, Y. Bert, C. Commeaux, M. Houeto, et al.. Spiral 2 Cryogenic System for The Superconducting LINAC. 26 International Cryogenic Engineering Conference International Cryogenic Materials Conference 2016, Mar 2016, New Delhi, India. pp.012115, ⟨10.1088/1757-899X/171/1/012115⟩. ⟨in2p3-01518359⟩