Cryogenic Heat Pipe Diode

Period of Performance: 07/20/1992 - 07/20/1994

$495K

Phase 2 SBIR

Recipient Firm

Creare, Inc.
16 Great Hollow Road Array
Hanover, NH 03755
Principal Investigator

Abstract

Creare, Inc., has designed a light-weight high performance cryogenic heat pipe diode which yields separation distances of 2m and allows effective noise and vibration isolation of the optics from the cryocooler with optimal positioning of the components. Creare has turned to the poor wicking ability (i.e. low surface tension) of cryogenic liquids to Creare's advantage. Using an evaporator section wick and by drilling 10 micron diameter holes in a metal foil to produce a diode heat pipe design. Creare obviates the need for any traps. Through the use of computer controlled laser drilling, the laser power and pulse duration was empirically determined to yield this phenomenal hole density. A potential spin-off application is a high purity filter; since the foil manufacturing does not require binders or talcs, it is ideal for medical applications where there are stringent purity requirements.