Spectroscopic Measurement of Shock Waves in an Arcjet Plasma Expanding Through a Conical Nozzle  

作　　者：K.KOZUE G.KUMAKAWA S.NAMBA T.ENDO K.TAKIYAMA K.SATO N.TAMURA 

机构地区：[1]Graduate school of Engineering, Hiroshima University,1-4-1 Kagamiyama,Higashi-Hiroshima,Hiroshima 739-8527,Japan [2]National Institute for Fusion Science,322-6 Oroshi-cyo, Toki,Gifu 509-5292,Japan

出　　处：《Plasma Science and Technology》2013年第2期89-92,共4页等离子体科学和技术（英文版）

摘　　要：A diamond-shaped shock wave was created in a helium arcjet plasma. Visi- ble/ultraviolet emission spectroscopy was used to investigate the condition for the formation of stable shocks and to determine characteristics of the plasma. Dependence of the position of the shock front on the gas pressure in the expansion region was investigated. It was found that the shock wave arises from the collision of plasma particles and residual neutral atoms in that region. Continuum and line spectra of neutral helium were measured, from which the electron temper- atures were derived. The electron density was deduced from the Inglis-Teller limit of the He I 2p3p-3d3D series. The temperature and density were found to have almost constant values of 0.2 eV and 8.5x 1013 cm-3, respectively, across the shock front.A diamond-shaped shock wave was created in a helium arcjet plasma. Visi- ble/ultraviolet emission spectroscopy was used to investigate the condition for the formation of stable shocks and to determine characteristics of the plasma. Dependence of the position of the shock front on the gas pressure in the expansion region was investigated. It was found that the shock wave arises from the collision of plasma particles and residual neutral atoms in that region. Continuum and line spectra of neutral helium were measured, from which the electron temper- atures were derived. The electron density was deduced from the Inglis-Teller limit of the He I 2p3p-3d3D series. The temperature and density were found to have almost constant values of 0.2 eV and 8.5x 1013 cm-3, respectively, across the shock front.

关 键 词：arcjet plasma shock wave plasma spectroscopy atomic and molecular pro-cesses 

分 类 号：O539[理学—等离子体物理]