Design and performance of the HESSI cryostat

摘要

The high energy solar spectroscopic imager (HESSI)spacecraft, to be launched in July 2000, will be used to observe thesun with the finest angular and energy resolutions ever achievedfrom a few keV to hundreds of keV. The spacecraft will use anarray of nine germanium (Ge) detectors, each 7.1 cm in diameterand 8.5 cm long, operating at 75K. The detectors are mounted in acryostat on a common coldplate, and cooled by a small Stirling-cycle cryocooler. This paper describes the design of the cryostat,special accommodations for the Ge detectors, interfaces with thecryocooler, and thermal performance of the engineering test unit.2000 Published by Elsevier Science Ltd. All rights reserved.