Performance Test of Pulse Tube Cooler with Integrated Circulator
Maddocks, J. R.
Helvensteijn, B. P. M.
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To address the need for remote and broad area cooling using regenerative cryocoolers, Atlas Scientific is developing a lightweight, continuous-flow Integrated Circulator (IC) for installation on Pulse Tube Cryocoolers (PTCs). The basis of the IC is a rectifier that converts the oscillating flow of a regenerative cryocooler into a steady flow of cold gas that can readily be distributed over distances of several meters to multiple or broad area thermal loads. The Integrated Circulator has advantages over competing technologies, such as the use of a secondary mechanical or capillary pump dedicated to circulating cryogens through a cold heat exchanger conductively coupled to the coldhead of the cryocooler, in that it eliminates the pump, its potential reliability problems, its parasitic power consumption, and the additional temperature rise introduced by the presence of the conductively coupled heat exchanger at the PTC coldhead. Here, we report on PTC performance measurements made both with and without the presence of an Integrated Circulator. Such measurements are necessary in order to make quantitative comparisons of the IC to competing technologies. The results indicate that the IC is indeed a viable alternative.