The development of a cryogenic over-pressure pump
2014
A cryogenic over-pressure pump (OPP) was tested in the prototype telescope
liquid nitrogen(LN2) cooling system for the
Dark EnergySurvey (DES) Project. This OPP consists of a process cylinder (PC),
gas generator, and solenoid operated valves (SOVs). It is a positive displacement pump that provided intermittent
liquid nitrogen(LN2) flow to an array of
charge couple devices(CCDs) for the prototype
Dark EnergyCamera (DECam). In theory, a heater submerged in liquid would generate the drive gas in a closed loop cooling system. The drive gas would be injected into the PC to displace that liquid volume. However, due to limitations of the prototype closed loop nitrogen system (CCD cooling system) for DECam, a quasiclosed-loop nitrogen system was created. During the test of the OPP, the CCD array was cooled to its designed set point temperature of 173K. It was maintained at that temperature via electrical heaters. The performance of the OPP was captured in pressure, temperature, and flow rate in the CCD LN2 c...
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