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Thermodynamic analysis of the 3-stage adr for the astro-h soft x-ray spectrometer instrument
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bialas, Tom Porter, Scott Shirron, Peter Kimball, Mark DiPirro, Michael Sneiderman, Gary Kelley, Richard |
| Copyright Year | 2015 |
| Description | The Soft X-ray Spectrometer (SXS) instrument on Astro-H will use a 3-stage ADR 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. In the secondary mode, which is activated when the liquid helium is depleted, two of the stages continuously cool the (empty) helium tank using a 4.5 K Joule-Thomson cooler as the heat sink, and the third stage cools the detectors. In the design phase, a high-fidelity model of the ADR was developed in order to predict both the cooling capacity and heat rejection rates in both operating modes. The primary sources of heat flow are from the salt pills, hysteresis heat from the magnets and magnetic shields, and power dissipated by the heat switches. The flight instrument dewar, ADR, detectors and electronics were integrated in mid-2014 and have since undergone extensive performance testing, in part to validate the performance model. This paper will present the thermodynamic performance of the ADR, including cooling capacity, heat rejection to the heat sinks, and various measures of efficiency. |
| File Size | 1853590 |
| Page Count | 34 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150018891 |
| Archival Resource Key | ark:/13960/t20c9zh77 |
| Language | English |
| Publisher Date | 2015-06-24 |
| Access Restriction | Open |
| Subject Keyword | Space Cryogenics Adiabatic Demagnetization Refrigerator Magnetic Refrigeration Adiabatic Demagnetization Cooling Performance Tests Cryogenic Equipment Cooling Refrigerators Thermodynamics Efficiency Liquid Helium Heat Transmission X Ray Astronomy Heat Radiators Heat Sinks Hysteresis X Ray Spectrometers Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Presentation |
