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- W3201337029 abstract "Experiments and modeling have been conducted toinvestigate the heat transfer from a thermal background similarwith that from an IFE chamber filled with a protective gas to adeuterium ice layer mimicking an IFE target. Simulations predictthat the heat transferred to the deuterium ice layer depends onsticking and accommodation coefficients but their values are notavailable in the literature. Depending upon these values the targetcould melt completely, so accurate values of these parametersdetermine the viability of different operational conditions for anIFE plant. An experiment was designed to estimate the stickingcoefficient and the heat transferred through Xe atoms condensation.The experiment developed the high-temperature, high-velocityconditions that a target will experience in the fusion reactorexpanding Xe gas (T> 2000 K) through a nozzle (atom velocity400m/s) and the gas-surface interactions by directing this beamonto a planar cryogenic target. Reflection High Energy ElectronDiffraction was used to measure the rate of Xe condensation on thecryogenic substrate. It was measured that less than a monolayer(ML) occurred on a Si substrate at 200, 100, 85 and 70 K at aseparation distance of 6.5 cm from nozzle. The heat of condensationwas negligible and the implications of this result for the IFEtarget heating during injection in the fusion chamber wereanalyzed. Ablation of at least 1 monolayer of Si was also observedwhen Si (70 K) was exposed to an Ar beam (at 6.5 cm fromsubstrate). A second method (3-ω method) was developed andinvestigated to measure the total heat flux transferred to the IFEtarget which is provided mainly through collisions (for anegligible sticking coefficient) of Xe atoms with the target. Thismethod successfully measured the rate heat was extracted from aliquid deuterium volume when it was frozen (1.2 J/s). Heat sourcesare to overcome the cooling capacity of the cryogenic system inorder to measure the rate heat flows into the deuteriumice." @default.
- W3201337029 created "2021-09-27" @default.
- W3201337029 creator A5084674184 @default.
- W3201337029 date "2009-01-01" @default.
- W3201337029 modified "2023-09-23" @default.
- W3201337029 title "Measurements of heat transferred to solid deuterium froma source similar to the thermal background in an IFEchamber" @default.
- W3201337029 hasPublicationYear "2009" @default.
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