Design of a 13T Nb3Al/Nb3Sn common coil magnet

徐慶金, 佐々木憲一, 中本建志, 寺島昭男, 土屋清澄, 山本明（KEK）；菊池章弘, 竹内孝夫（NIMS ）
qingjin*post.kek.jp

Abstract:A high field Nb3Al/Nb3Sn combined magnet is under development，as a R&D program of “Advanced Superconducting Magnets for the LHC Luminosity Upgrade”，in the framework of the CERN-KEK cooperation program. As the first stage of the whole program，the goal of this project is to demonstrate the feasibility of high field magnet wound with Nb3Al cable.
The magnetic and mechanical design of the magnet is finished. The fabrication，assembly and test processes will be carried out in the following two years. With a common coil design，there are totally 5 superconducting coils in this magnet，3 Nb3Al coils sandwiching 2 Nb3Sn coils. For the Nb3Al coils，the peak field is 13.2T，located at the center of straight part; for the Nb3Sn coils，it is 11.9T，located at the end part. Shell structure was adopted in the mechanical design，to simplify the future assembly process. The detailed 3D design is presented in this paper.