Status of the Relativity Mission superfluid helium flight dewar.

Details Status of the Relativity Mission superfluid helium flight dewar. Status of the Relativity Mission superfluid helium flight dewar.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cryo...39..369r&link_type=abstract

Cryogenics, Vol. 39, No. 4, p. 369 - 379

Computer Science

Performance

Space Instrumentation

Scientific paper

The world's largest capacity helium flight dewar has been assembled for use on the Relativity Mission, also known as Gravity Probe-B (GP-B). Acceptance tests have been successfully performed and the dewar has been delivered to Stanford University. The science mission dewar (SMD) is the first piece of flight hardware delivered for GP-B. It will be used in testing to demonstrate payload functionality with a prototypical Science Instrument Assembly, the flight spare probe (Probe-B), and prototypical electronics. This paper reviews the key design features of the dewar, especially those driven by the ultralow magnetic field requirements. The measured mass, helium boil-off, and ground hold performance are compared to those of the previously launched superfluid helium cryostats (IRAS, COBE, and ISO).

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