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Development of superconducting combined function magnet for the J-PARC neutrino experiment

The JAERI-KEK Joint Facility for High Intensity Proton Accelerators, called the J-PARC Project, is in rapidly progess. The long baseline neutrino oscillation experiment is one of the main projects of J-PARC. A superconducting magnet system is adopted for bending the proton beam extracted from 50GeV main ring to an angle of about 90 degree in the limited site.

A remarkable feature of the magnet developing now is a super-conducting combined function magnet, which can generate both dipole and quadrupole magnetic field. This structure allows to reduce the number of magnets, that is, to save the cost. In order to minimize cost, some other features, e.g. the use of plastic spacer and the design of quench protection system without quench protection heater etc., are adoped.

Fig.1. Cross sectional view of superconducting combined function magnet.

Fig.2. Magnetic field calculated by FEM.

1-1 Oho, Tsukuba, Ibaraki 305-0801 Japan