A technique for optimization of the parameters of the cryostatted screen in a cryovacuum test bench

Abstract
Analytical formulae have been obtained to identify the requirements for the parameters of the cryostatted screen applied in cryovacuum test benches for optoelectronic instruments where the environments are as close to the cold outer space as possible.  These formulae may be used for trade-off selection of a set of such parameters as mass flow of helium vapour and its temperature at the inlet of the heat exchanger; length of the heat exchanger pipeline to provide full recuperation; thickness of the screen and distance between the pipe coils to provide for the required isothermal effect of the screen with minimum weight; pipe diameter to make the cryoagent flow rate conformable to the requirements for allowable hydraulic losses in the heat exchanger circuit.