Computer Science – Performance
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998esoc...55..214m&link_type=abstract
NICMOS and the VLT: A New Era of High Resolution Near Infrared Imaging and Spectroscopy, Pula, Sardinia, Italy, June 26-27th 199
Computer Science
Performance
Scientific paper
NASA is developing the NICMOS Cooling System (NCS) to provide operation of NICMOS beyond the exhaustion of its stored solid nitrogen cryogen. It is planned that the NCS will be installed into HST in early 2000 during the Third HST Servicing Mission (SM3). This development was motivated by the development of a thermal short within the NICMOS dewar which has reduced the cryogen lifetime from a planned 4.5+ years to slightly less than 2 years. While the acceleration of the the NICMOS observing program and the selection of a second round of General Observer proposals will permit NICMOS to obtain up to 70 percent of its originally anticipated observations, the extension of the NICMOS operational period will both enable additional science programs and provide HST with a near infrared capability potentially until the end of the HST mission. The NCS combines an external radiator identical in design to the ACS/STIS Aft Shroud Cooling System (ASCS) planned for SM3, a Creare, Inc. reverse-Brayton cycle turbine cooler, and an EVA installed neon loop to the NICMOS dewar's cooling coil. This system has been assembled and is undergoing system level testing in May 1998. A validation flight on the HOST pallet onboard STS-95 in October 1998 is planned. We discuss the design of the NCS and the expected post-SM3 performance of NICMOS with the NCS.
Cheng Edward S.
MacKenty John W.
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