Anomaly of One-Stage Double-inlet Pulse Tube Refrigerator

Publisher Summary Among many modifications of the pulse tube refrigerator, the double-inlet type devised has great advantages in its improved performance and its simplicity. This chapter investigates the performance of one-stage double-inlet pulse tube refrigerator in detail. One-stage double-inlet pulse tube refrigerator generates a low temperature 23.9 K. Anomalous temperature variation occurred in the pulse tube against the bypass valve opening, which is considered to be common in this type of the pulse tube refrigerator. In order to make clear the reason for this anomaly, experiments are performed and reasonable conclusion is obtained. With opening the bypass valve, the temperature distribution along the pulse tube changes from the one with low temperature (∼220 K ) at the position T4 of the pulse tube to the other with high temperature ( ∼270 K ) at the position T4.