No abstract

No abstract

No abstract

A superconducting High Gradient Magnetic Separation (HGMS) sample test facility has been constructed at the IEE CAS. In order to shorten the magnet charging time, it is necessary not only to reduce the magnet inductance, but also to increase the cryogenic stability. Based on our experience, narrow LHe channel cooling inside the high current density magnet is a good solution. In this paper, design, construction and test results are described. The solenoid is wound with 1.46 mm x 2.4 mm and 1.26 mm x 2.4 mm rectangular NbTi-Cu composite, the filament diameter is about 25 pm, and the length, the inner and outer diameter are 420 mm, 176 mm and 232 mm, respectively. The channel between two layers is formed by 0.5 mm x 4 mm epoxy fibreglass strip along the axis. The central field of 5.45 T has been reached and the charging speed of 9 T/min has been achieved.

A superconducting magnat system for MHD propulsion research is being constructed at the IEE CAS. The magnet is a large bore dipole with the inner diameter of 205mm, the winding is a layer wound 600 rircular saddle with the design central field of 4T and the length of 830". The outer diameter, the total length and height of the cryostat are 650mm, 1300" and 1390" respectively. Equipped with a removable current lead and a superconducting switch, the system will be operated for 5 days with ;an available liquid helium of 50 liters. The magnet system will be used for a MHD propulsion model ship.