An Adsorption Pumped 3He Cooled ir Detector

Abstract

An ir bolometer is described which demonstrates the use of cryopumping on ³He to achieve temperatures of ∼0.3 K for sensitive detector operation without the usual encumbrances of an external diffusion or mechanical pump. This technique provides a new versatility for ³He cryostats, as demonstrated by the operation of a telescope mounted detector for the past year at Mauna Kea Observatory.