| Popis: |
Since the efficiency of high power components, such as doped Yttrium Aluminum Garnet (YAG) laser amplifiers, improves dramatically at cryogenic temperatures, a cooling system capable of high performance at cryogenic temperatures is desirable. Because of its many favorable qualities, pool boiling liquid nitrogen (LN2) is the cryogenic cooling system of choice. However, as the power density of systems increases and laser systems migrate to agile hosts; the limitations of pool boiling become more restrictive. To expand beyond the flux and orientation limits of LN2 pool boiling, two systems based on jet impingement were developed and tested. The first cooled fluxes up to 70 W/cm 2 at a heat load of 1500 W. It demonstrated temperature stability, variations less than 1.5 K at 60 W/cm 2 over 20 minutes. The second system provided 50 W/cm 2 cooling (500 W total) while inverted, operating against gravity. |
