Abstract
A concentric double solenoid magnet, which can generate a magnetic field up to 10T, is constructed with V3Ga, Nb3Sn, Nb-Ti materials. The Nb3Sn tape of the least current density is put on the extreme parts of the inner solenoid to avoid the magnetic instability due to perpendicular field. The magnet quenches regularly at the limit of current capacity in both solenoids. It is observed, as expected, that the influence of magnetization in the internal solenoid is important on field distribution even by charging only the external solenoid. The residual field and the field distribution at increase or decrease of current are measured on the axis at several conditions, charging only the external solenoid, only the internal solenoid or the both.
