パルス管冷凍機の近室温領域への適用化研究

摘要

パルス管冷凍機は，膨張部にピストン機構などのrn可動部をいっさい持たないシンプル構造で低振動であrnることなどから，高温超伝導デバイスや赤外線検出素rn子の冷却をはじめ様々な分野での応用が期待されていrnる．しかし，その適用冷凍温度域は，おおよそrn100K以下に限定されており，それより高温度域でのrn適用例はほとんど見当たらない．%In recent years, much interest has been poured for the development of pulse tube refrigerators that have a simple construction and do not use the ozone depleting fluids. But, the application of pulse tube refrigerators has been limited to the deep freeze range and has not been performed in the near-room-temperature region. In the region, the performance of the pulse tube refrigerators is very low because basically the expansion work of pulse tube refrigerators cannot be recovered. In this paper, we suggest a new type of the pulse tube refrigerator that overcomes the conventional fault. It is the series type pulse tube refrigerator that has some pulse tubes connected in series. We attempted to make clear the characteristics of the series type refrigerator by employing a numerical cycle simulation based on the nodal analysis. The results prove that the series type pulse tube refrigerator has a high potential for the near-room-temperature region use.