Abstract
Raytheon Mahwah Electro-Optics Center has been developing a Stirling-cycle cryocooler for infrared imaging applications. This new linearly driven cooler has the same weight, fit and function as the current HM7060 series coolers with significant improvement in performance in three areas: cooling capacity, motor efficiency and range of ambient temperature. The cooling capacity has been increased by more than 10 percent by increasing the compressor swept volume. This change will allow faster cooling as well as the more cooling capacity. The design of the magnetic circuit of the linear motor has been further optimized to obtain a 15 percent improvement in motor efficiency. Material selection and clearance seal configuration have been improved to allow smooth operation at high temperature environment with average cooler case temperature at 90 degrees Celsius. As a typical example of the improved performance, the new cooler is capable of providing over 350 mW of cooling at 80 K with a cooler case temperature of 90 degrees Celsius and an ac input power of about 25 W. This paper describes the design, fabrication, and performance test results of this new cooler.
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