Systematic investigation of the barrier discharge operation in helium, nitrogen, and mixtures: discharge development, formation and decay of surface charges
Systematic investigation of the barrier discharge operation in helium, nitrogen, and mixtures: discharge development, formation and decay of surface charges
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DOI：
10.1088/0022-3727/47/36/365204
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发表时间：
2014-08
期刊：
影响因子：
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通讯作者：
R. Tschiersch;M. Bogaczyk;H. Wagner
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文献类型：
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作者：
R. Tschiersch;M. Bogaczyk;H. Wagner
作为先前对氦气和氮气中势垒放电 (BD) 研究的逻辑延伸，目前的工作报告了两种纯气体的任何混合物中的操作。使用完善的平面平行放电单元配置可以研究 He/N2 混合比对不同放电模式形成的影响。它们的表征是通过测量氧化硅铋（Bi12SiO20，BSO）晶体上的放电发射发展以及表面电荷的形成和衰减来进行的。这是通过同时应用时空分辨光学发射光谱和电光泡克尔斯效应并结合 CCD 高速相机来实现的。扩散和丝状 BD 的存在图是通过改变所施加电压的幅度和形状来确定的。在 He/N2 比率的整个范围内，扩散模式可以在中等电压幅度下运行，而丝状化发生在显着的过电压下，并且有利于高电压转换速率。无论放电模式如何，放电击穿期间的总体电荷转移与累积的表面电荷量非常一致。超过典型放电周期的 LED 照明会导致沉积在 BSO 晶体上的表面电荷呈指数衰减。在衰变过程中，观察到源自先前微放电的正表面电荷点和负表面电荷点的径向分布变宽。这些研究有助于更好地理解电介质中的电荷积累。
As a logical extension to previous investigations of the barrier discharge (BD) in helium and nitrogen, the present work reports on the operation in any mixtures of both pure gases. Using a well-established plane-parallel discharge cell configuration allows to study the influence of the He/N2 mixing ratio on the formation of different discharge modes. Their characterization was made by measuring the discharge emission development together with the formation and decay of surface charges on a bismuth silicon oxide (Bi12SiO20, BSO) crystal. This was realized by the simultaneous application of the spatio-temporally resolved optical emission spectroscopy, and the electro-optic Pockels effect in combination with a CCD high speed camera. The existence diagram for diffuse and filamentary BDs was determined by varying the amplitude and shape of the applied voltage. Over the entire range of the He/N2 ratio, the diffuse mode can be operated at moderate voltage amplitudes whereas filamentation occurs at significant overvoltage and is favoured by a high voltage slew rate. Irrespective of the discharge mode, the overall charge transfer during a discharge breakdown is found to be in excellent agreement with the amount of accumulated surface charges. An exponential decay of the surface charge deposited on the BSO crystal is induced by LED illumination beyond a typical discharge cycle. During the decay process, a broadening of the radial profiles of positive as well as negative surface charge spots originating from previous microdischarges is observed. The investigations contribute to a better understanding of the charge accumulation at a dielectric.