Demonstration Poloidal Coil Test Facility

The Performance Test Results of the Cryogenic Circulation Pump

Abstract

The world largest supercritical helium pump is developed by Japan Atomic Energy Research Institute (JAERI) in collaboration with Kawasaki Heavy Industries, Ltd. (KHI) in order to supply supercritical helium for the Demonstration Poloidal Coil (DPC) which are forced-flow cooled type superconducting pulse coils. The helium pump is one of key components of the DPC test facility, which was completed in the middle of March 1988. This pump development is a step for a large helium pump development for the Fusion Experimental Reactor (FER) which requests supercritical helium with mass flow rate of a few thousand gram per second. Double acting bellows mechanism is adopted for this pump to realize a high pump efficiency with large mass flow rate. In the performance test, the design flow rate of 350g/s is achieved with a pump head of 1.0 bar at both working pressure of 10 bar and 6 bar. The pump efficiency, indicated by adiabatic efficiency, is measured to be 64% in the design operation points, which exceeds to the design value of 60%. Maximum flow rate of 680g/s and 640g/s are obtained with pump head of 1.0 bar at the preliminary performance test and the final performance test in the DPC test facility, respectively.