A new probe for measuring small electric fields in plasmas
A new probe for measuring small electric fields in plasmas
复制标题
用于测量等离子体中小电场的新型探针
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
R. Stenzel
中科院分区：
文献类型：
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作者：
R. Stenzel
偶极双探头已开发用于实验室等离子体中小电场的原位测量。该探头以高灵敏度 (Emin≂10 μV/cm) 测量直流到交流电场 (0≤f≲20 MHz)，并对空间电荷电场 (Esc(Esc= −∇φp) 和感应电场 (Ei = −∂A/∂t) 做出响应。使用电压频率转换，可以获得没有误差和传输线负载效应的探头信号。介绍了新探头的各种有用应用示例，例如作为（i）直流双极场，（ii）离子声波的交流空间电荷场，（iii）哨声波的交流感应场，以及（iv）载流磁等离子体中的混合感应和空间电荷电场的测量。
A dipolar double probe has been developed for in situ measurements of small electric fields in laboratory plasmas. The probe measures dc to ac electric fields (0≤f≲20 MHz) with high sensitivity (Emin≂10 μV/cm) and responds to both space charge electric fields (Esc(Esc= −∇φp) and inductive electric fields (Ei = −∂A/∂t). Using voltage‐to‐frequency conversion, the probe signal is obtained free of errors and loading effects by a transmission line. Various examples of useful applications for the new probe are presented, such as measurements of (i) dc ambipolar fields, (ii) ac space‐charge fields of ion acoustic waves, (iii) ac inductive fields of whistler waves, and (iv) mixed inductive and space‐charge electric fields in current‐carrying magnetoplasmas.