Evaluation of Para-Perp Type Mach Probe by Using a Fast Flowing Plasma

概要

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Mach probe with two collecting tips facing to the direction parallel and perpendicular to the plasma flow, named para-perp type one, is evaluated by using a directional Langmuir probe (DLP) in a fast flowing plasma produced by an MPD (Magneto-Plasma-Dynamic) arcjet. We present simple formulas to determine an ion acoustic Mach number M_<i >from the ratio of collected ion saturation currents. The formulas and experimentally-obtained data are compared with Hutchinson's simulation results which are calculated using a particle-in-cell(PIC) code in an unmagnetized plasma condition. [I.H. Hutchinson, Plasma Phys. Control. Fusion, 44 1953 (2002).] Good agreements are obtained among these data in both subsonic and supersonic plasma flows. Correction factor TC to determine M_<i >is presented under various conditions of T_<i/>T_<e >and the specific heat ratio for ions γ_<i.>
社団法人プラズマ・核融合学会の論文
2005-06-25