A Small Long-Life Dewar for Explorer-Type Space Experiments
Present and future space experiments are being designed to be small, lightweight, low cost, and if superfluid helium (SfHe) cooled, often will fly in a solar orbit. This paper presents the design of a 90-liter SfHe dewar that fulfills these requirements. The dewar is constructed from aluminum with stainless steel plumbing, has thermally efficient gamma alumina supports, multilayer insulation, and low thermal conductance electrical ribbon cables. With a vacuum shell radiantly cooled to < 60 K , the anticipated lifetime is 2 years. The dewar is fully instrumented with mass quantity gages, and temperature and pressure sensors. It also has strain and accelerometer gages to permit detailed performance measurement which will be used to identify future design improvements. An instrument cavity is provided for housing instruments at < 1.4 K.
KeywordsGamma Alumina Insulation System Superfluid Helium Instrument Cavity Porous Plug
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