レーザー駆動プラズマ風洞による高密度酸素原子流の生成

概要

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High density atomic oxygen flows were generated by a laser driven plasma wind tunnel using a 2 kW class continuous wave laser. Using argon and oxygen as working gases, laser sustained plasma (LSP) was successfully produced in the plenum pressure range from 0.20 MPa to 0.95 MPa, and then the LSP was expanded to the vacuum chamber through the convergent-divergent nozzle. Plume characteristics were evaluated by laser absorption spectroscopy using an absorption line of ArI 772.38 nm. As a result, the specific enthalpy has almost flat distributions around 3.7 MJ/kg – 4.8 MJ/kg in the radial region less than 3 mm, where oxygen was found fully dissociated. The maximum flux density of atomic oxygen was estimated to be 2.2×1021 cm-2s-1.
プラズマ応用科学会,東京大学大学院工学系研究科,東京大学大学院新領域新領域創成科学研究科,Department of Aeronautics and Astronautics, The University of Tokyo,Department of Advanced Energy, The University of Tokyoの論文