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电子回旋共振离子推力器(ECRIT)离子源的内部磁场会干扰离子源内等离子体诊断,选择合理的诊断方法需要分析离子源特性,了解磁场对诊断结果的影响。为此,采用朗缪尔(Langmuir)探针诊断了离子源的等离子体信息,根据朗缪尔探针理论得到电子温度、电子数密度、离子数密度,根据Druyvesteyn方法得到电子温度、电子数密度。结合实验现象,对比了不同方法所得诊断参数差异,分析了诊断结果的准确性。诊断结果表明:诊断位置到轴线的径向距离>10 mm后,离子数密度由3.0×1017 m-3增至1.8×1018 m-3,符合离子源的放电原理和实际的放电形貌;不同处理方法所得电子温度、电子数密度接近,电子温度诊断值范围是4~20 e V,电子数密度诊断值范围是(2.0~9.0)×1016 m-3。离子数密度诊断结果较电子数密度诊断结果准确;电子温度较低时,使用积分得到的电子温度更准确;平行于探针的磁场会显著降低诊断得到的电子数密度,探针收集面垂直于磁场可减弱磁场干扰。
Electromagnetic cyclotron resonance ion thrusters (ECRIT) The internal magnetic field of an ion source can interfere with plasma diagnostics within the ion source. Selecting a reasonable diagnostic method requires analyzing the properties of the ion source to understand the effect of the magnetic field on the diagnostic result. For this purpose, the Langmuir probe is used to diagnose the plasma information of the ion source. The electron temperature, the electron density and the ion number density are obtained according to the Langmuir probe theory. The electron temperature, the electron density . Combined with the experimental phenomena, the differences of the diagnostic parameters obtained by different methods were compared, and the accuracy of the diagnostic results was analyzed. The diagnostic results show that the ionic number density increases from 3.0 × 1017 m-3 to 1.8 × 1018 m-3 after the radial distance> 10 mm from the diagnostic location to the axis, which is consistent with the discharge principle and the actual discharge morphology of the ion source. The electronic temperature and electron density obtained by the treatment method are close to each other. The diagnostic value range of electron temperature is 4-20 eV, and the diagnostic value range of electron number density is 2.0-9.0 × 1016 m-3. The diagnostic result of ion number density is more accurate than that of electron number density. When the electron temperature is low, the electron temperature obtained by using integral is more accurate. The magnetic field parallel to the probe can significantly reduce the number density of electrons obtained by the diagnosis. The probe collecting surface is perpendicular to Magnetic field can weaken the magnetic field interference.