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As part of the Laser Megajoule Facility for cryogenic targets, we have studied the heat transfer at low temperature (6 K<T<20 K) between two coaxial cylinders whose annular space was filled with helium gas. We have built a cryostat and carried out many experiments on the conduction/convection heat transfer transition in closed annular spaces. We found that gas convection begins as soon as a...
An experimental study was carried out on the tribological behaviour of materials of interest in cryogenic applications, focusing on diamond and graphite. Both natural diamond (referred in the text as diamond) and chemical-vapour-deposition (CVD) diamond (CVD-diamond) were used. The experiment was carried out using a pin-on-disc tribometer capable of operating at cryogenic temperatures, from 4.2...
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