To conduct plasma research with a steady-state high magnetic field, a magnetic mirror system with a pair of superconducting magnets (SCMs), named Superconducting Magnet Plasma Research Facility (SPRF), is under development. Major components of the system are a pair of NbTi solenoid SCMs, two cryostats, a plasma chamber, and a dc power supply. Each SCMs is separated by 1-m distance and operated at 800 A. The magnetic flux density on the axis of the SPRF is 0.23 T at the mid point and 3.1 T at the magnet center, which gives the mirror ratio of 13.4.

In this paper, we describe the design consideration of SPRF, including the development activities of the magnets and the cryostats. Also, the test results of the magnets and the cryostats are described.