Preliminary analyses and development tests are beginning to define the Gravity Probe B (GP-B) superfluid helium dewar and probe that contain the scientific instrument. The status of the current dewar and probe concept is reported, and supporting analyses used to define the neck tube region are described.
R. T. Parmley,
"Gravity Probe B Dewar/Probe Concept", Proc. SPIE 0619, Cryogenic Optical Systems and Instruments II, (18 July 1986); doi: 10.1117/12.966645; https://doi.org/10.1117/12.966645