4K V-M Type Pulse Tube Refrigerator
Institute of Quantum Science, Nihon University
@Dai Wei, Y.Matsubara, H.Kobayashi
This report gives the newest result on V-M type pulse tube refrigerator. By increasing work transfer tube volume, we obtained high to low pressure ratio around 1.3. We also changed the branch line position from the cold end of regenerator to cold end of work transfer tube, which improved working condition for the displacer. After these modifications we obtained lowest temperature below 4K.