NASA Technical Reports Server (NTRS) : Thermodynamic pdf

NASA Technical Reports Server (NTRS) : Thermodynamic

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The Soft X-ray Spectrometer (SXS) instrument[1] on Astro-H[2] will use a 3-stage ADR[3] to cool the microcalorimeter array to 50 mK. In the primary operating mode, two stages of the ADR cool the detectors using superfluid helium at =1.20 K as the heat sink[4]. In the secondary mode, which is activated when the liquid helium is depleted, the ADR uses a 4.5 K Joule-Thomson cooler as its heat sink. In this mode, all three stages operate together to continuously cool the (empty) helium tank and singleshot cool the detectors. The flight instrument – dewar, ADR, detectors and electronics – were integrated in 2014 and have since undergone extensive performance testing. This paper presents a thermodynamic analysis of the ADR’s operation, including cooling capacity, heat rejection to the heat sinks, and various measures of efficiency

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 10/23/2015
• Year: 2015
• Book Topics/Themes: NASA Technical Reports Server (NTRS), X RAY SPECTROMETERS, THERMODYNAMICS, PERFORMANCE TESTS, CRYOGENIC EQUIPMENT, COOLING, CALORIMETERS, LIQUID HELIUM, HEAT SINKS, FLIGHT INSTRUMENTS, THERMAL ABSORPTION, SUPERFLUIDITY, Shirron, Peter J., Kimball, Mark O., James, Bryan L., Muench, Theodore, DiPirro, Michael J., Bialas, Thomas G., Sneiderman, Gary A., Porter, Frederick S., Kelley, Richard L

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