Status of MSBS Study at NAL

A superconductive solenoid model core was suspended successfully in the NAL 60-cm MSBS. The cryostat containing the solenoid is 600 mm long and its diameter is 87ram and the solenoid works at 4.2K. Its material is NbTi. Duration time of the permanent current mode is about 1 hour. According to several test results, the available time for wind tunnel tests is around 30 minutes for the system. The superconducting solenoid core has the same characteristics, up to 20A in coil current, in the MSBS as the permanent magnet core does. The model position sensing system was improved to be easy to use. An auto-calibration system was built. The lighting system was improved to light up with red and green lights respectively from upper and side ways in order to avoid the interference between lateral and longitudinal position components. The 60cm MSBS was installed in a low speed wind tunnel with a closed circuit. A cylindrical model and a cone-cylinder model were suspended at various flow speeds up to 28.5m/s without any extra motion comparedwith flow off.