首页|Diagnosing ratio of electron density to collision frequency of plasma surrounding scaled model in a shock tube using low-frequency alternating magnetic field phase shift

Diagnosing ratio of electron density to collision frequency of plasma surrounding scaled model in a shock tube using low-frequency alternating magnetic field phase shift

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A non-contact low-frequency(LF)method of diagnosing the plasma surrounding a scaled model in a shock tube is proposed.This method utilizes the phase shift occurring after the transmission of an LF alternating magnetic field through the plasma to directly measure the ratio of the plasma loop average electron density to collision frequency.An equivalent circuit model is used to analyze the relationship of the phase shift of the magnetic field component of LF electromagnetic waves with the plasma electron density and collision frequency.The applicable range of the LF method on a given plasma scale is analyzed.The upper diagnostic limit for the ratio of the electron density(unit:m-3)to collision frequency(unit:Hz)exceeds 1 × 1011,enabling an electron density to exceed 1 × 1020 m-3 and a collision frequency to be less than 1 GHz.In this work,the feasibility of using the LF phase shift to implement the plasma diagnosis is also assessed.Diagnosis experiments on shock tube equipment are conducted by using both the electrostatic probe method and LF method.By comparing the diagnostic results of the two methods,the inversion results are relatively consistent with each other,thereby preliminarily verifying the feasibility of the LF method.The ratio of the electron density to the collision frequency has a relatively uniform distribution during the plasma stabilization.The LF diagnostic path is a loop around the model,which is suitable for diagnosing the plasma that surrounds the model.Finally,the causes of diagnostic discrepancy between the two methods are analyzed.The proposed method provides a new avenue for diagnosing high-density enveloping plasma.

low-frequency alternating magnetic field phase shiftshock-tube plasma diagnosiselectron den-sitycollision frequency

吴明兴、谢楷、刘艳、徐晗、张宝、田得阳

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School of Aerospace Science and Technology,Xidian University,Xi'an 710071,China

Hypervelocity Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China

国家自然科学基金国家自然科学基金Science and Technology Projects of Shaanxi Province,ChinaScience and Technology Projects of Shaanxi Province,Chinascience and Technology Projects of Xi'an City,Chinascience and Technology Projects of Xi'an City,China

52107162122024792022CGBX-122022KXJ-5723KGDW0023-202223GXFW0011

2024

10.1088/1674-1056/ad2d56

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(5)
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