A Simple Method of Temperature Stabilization for 4 K GM Cryocooler

Abstract

This chapter develops a simple method of temperature stabilization for 4 K GM cryocooler. It applies the high volumetric specific heat of pressurized helium at 4 K region to reduce the temperature fluctuation of the 4 K stage. It describes the experimental details and the results. In a proposed simple method of temperature stabilization for 4 K G M cryocooler a copper pot connected to compressor unit by a capillary tube is mounted on the 4 K stage of a GM cryocooler. The utilization of high volumetric specific heat of pressurized helium in the pot at 4 K region produces good temperature stability on the 4 K stage. The periodic temperature fluctuation of the 4 K stage is, 43.5 K (peak-to-peak) typically, but the helium pot reduces the temperature fluctuation effectively down to, 43.05 K (peak-to peak). The system can be operated continuously, and is easy to cool down, furthermore it is safe to use.