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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Experimental investigations of the nonlinear dynamics of a complex space-charge configuration inside and around a grid cathode with hole
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Experimental investigations of the nonlinear dynamics of a complex space-charge configuration inside and around a grid cathode with hole

机译：带有孔的网格阴极内部和周围的复杂空间电荷构型的非线性动力学的实验研究

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By negatively biasing a metallic grid with a small hole, down to a critical value of the applied potential a complex space-charge structure appears inside and around the grid cathode. The static current-voltage characteristic of the discharge shows one or two current jumps (the number of current jumps depending on the working gas pressure), one of them being of hysteretic type. Electrical probe measurements show a positive potential inside the grid cathode with respect to the potential applied on it. This is interpreted as being due to the hollow cathode effect. Thus, the inner fireball appears around the virtual anode inside the grid cathode. For more negative potentials, the electrons inside the cathode reach sufficient energy to penetrate the inner sheath near the cathode, passing through the hole and giving rise to a second fireball-like structure located outside the cathode. This second structure interacts with the negative glow of the discharge. The recorded time series of the discharge current oscillations reveal strongly nonlinear dynamics of the complex space-charge structure: by changing the negative potential applied on the grid cathode, the structure passes through different dynamic states involving chaos, quasi-periodicity, intermittency and period-doubling bifurcations, appearing like a competition of different routes to chaos.
机译：通过将带有小孔的金属栅极负偏压到施加电势的临界值，可以在栅极阴极内部和周围出现复杂的空间电荷结构。放电的静态电流-电压特性显示一个或两个电流跃变（电流跃变的数量取决于工作气体压力），其中之一是滞后类型的。电探针测量显示出相对于施加在栅极阴极上的电势，栅极阴极内部的正电势。这被解释为是由于空心阴极效应引起的。因此，内部火球出现在栅格阴极内部的虚拟阳极周围。对于更多的负电势，阴极内部的电子达到足够的能量以穿透阴极附近的内部护套，穿过该孔并产生位于阴极外部的第二个类似火球的结构。该第二结构与放电的负光相互作用。记录的放电电流振荡的时间序列揭示了复杂的空间电荷结构的强烈非线性动力学：通过改变施加在栅极上的负电势，结构可以通过不同的动态状态，包括混沌，准周期性，间歇性和周期-分叉增加一倍，就像是一条通往混乱的不同路线的竞赛。

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