| タイトル | Detector Assembly and the Ultralow-Temperature Refrigerator for XRS |
| 著者（英） | Pham, T.; Stahle, C. K.; Audley, M. D.; Tuttle, J. G.; Szymkowiak, A. E.; Gendraau, K. C.; Kelley, R. L.; Gysax, J. D.; Dipirro, M. J.; Porter, F. S.; Brekosky, R. P. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1999-01-01
1999 |
| 言語 | eng |
| 内容記述 | The X-ray spectrometer (XRS) on the Japanese Astro-E Spacecraft is the first ultra low temperature space borne instrument. The system utilizes a 900g Ferric Ammonium Alum (FAA) Adiabatic Demagnetization Refrigerator (ADR) with a helium-3 gas gap heat switch to cool the detector assembly to 0.060K. The system operates in a "single shot" configuration allowing the system to remain at its operating temperature for about 40 hours in the lab. The on-orbit performance is expected to be about 35 hours with a 97% duty cycle. The detector assembly for XRS consists of a 32 channel microcalorimeter array bias electronics, thermometry, and an anti-coincidence detector that are attached to the cold stage of the ADR. To thermally Isolate the detector system from the superfluid helium reservoir, the detector system is suspended by Kevlar cords and electrical connection in made by L30, 17-micron diameter, tensioned NbTi leads. The detectors are read out in a source-follower arrangement using FET amplifiers operating at 130K mounted in multiply-thermally-isolated assemblies that also use Kevlar and stainless steel wiring. The design and thermal performance of this system will be discussed and compared to the theoretical limits. |
| NASA分類 | Spacecraft Instrumentation |
| 権利 | No Copyright |
|
