thereof the wire mesh 40 preferably comprises 120 wire per inch stainless steel wire mesh and is provided along an internal surface or internal diameter 44 of the heat pipe 28 the wire mesh 40 provides an even distribution of additional surface area for evaporation of liquid ammonia thus those skilled in the art will appreciate that the end 42 of each heat pipe 28 preferably is coupled to the heat rejector block 30 of a cryocooler unit 24 as alluded to above the heat pipes 28 preferably are shaped such that when the heat pipes 28 are mounted and thermally coupled to a cryocooler unit 24 and related heat dissipation assembly 14 an upper section 46 of the heat pipes 28 forms an angle of approximately 7 u00b0 with respect to horizontal this ensures that even if an htsc filter system 10 incorporating the heat pipes 28 is installed 5 u00b0 from true the upper sections 46 of the heat pipes 28 will remain tilted with respect to horizontal this ensures proper drainage of condensed ammonia from the upper sections 46 of the heat pipes 28 as further shown in fig2 the heat pipes 28 preferably comprise 0 5 inch diameter stainless steel tubing and have end caps 50 and 52 provided at the respective ends thereof the end caps 50 and 52 preferably are tig welded to.