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- W85594429 abstract "This chapter measures the Kapitza conductance at the niobium-helium II interface for temperatures ranging from 1.5 K to 2.1 K, using a new experimental method in which the heat flux is directed from the liquid to the solid. These experiments clearly explore the effects of chemically polishing rough surfaces and the influence of surface oxides on the heat transfer process. The experiment shows that heat is evacuated more easily across a Nb-He II interface than expected on the basis of the Khalatnikov theory. The results suggest that this is due to the nature of the boundary rather than bulk properties of each medium. The Kapitza conductance for rough surfaces is of the order of 0.057xT 3 ( W.cm -2 K -1 ). The conductance is a factor ∼2 larger for surfaces that underwent a chemical treatment. Finally, for samples that were treated for impurities by a titanification process, the Kapitza conductance is of the order of O.15xT 3 (W.cm -2 K -1 ) , that is, heat is removed at a rate of 0.86W.cm -2 .K -1 at T = 1.8K, the optimum temperature of a S.R.F. cavity." @default.
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- W85594429 date "1997-01-01" @default.
- W85594429 modified "2023-09-25" @default.
- W85594429 title "Kapitza Conductance of Niobium for S. R. F. Cavities" @default.
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- W85594429 doi "https://doi.org/10.1016/b978-008042688-4/50131-9" @default.
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