Experimental results of ITER cold circulators towards the performance demonstration

性能実証に向けたITER低温循環装置の実験結果

Bhattacharya, R.*; Vaghela, H.*; Sarkar, B.*; Patel, P.*; Das, J.*; Srinivasa, M.*; 礒野 高明; 河野 勝己

Bhattacharya, R.*; Vaghela, H.*; Sarkar, B.*; Patel, P.*; Das, J.*; Srinivasa, M.*; Isono, Takaaki; Kawano, Katsumi

The design point for the cold circulator of ITER cryo-distribution system has been specified as 2.21 kg/s at 4.3 K inlet temperature having 1.5 bar pressure head dedicated for the nominal operation of toroidal field superconducting magnet. Two cold circulators, manufactured by two independent suppliers, have been installed in the Test Auxiliary Cold Box (TACB) followed by integration of TACB system with the 5.0 kW at 4.5 K class cryogenic test facility at JAEA. Final cold acceptance test of the complete system has been performed in order to validate the design conditions of TACB and cold circulators. Qualification tests of the circulators have been executed at closed loop operating condition. The paper will describe the cool-down of cold circulators down to 4.5 K and normal operating results as well as the experimental validation of performance along with the obtained isentropic efficiencies at the operating conditions meeting the system level requirements of ITER cryo-distribution.