Here, a microplasma channel was investigated. The design was developed from a recently presented modular microplasma array. The setup consists of three stacked layers: a magnet, a dielectric foil and two nickel foils that are separated by a 120 μm wide gap. The magnet is grounded while the two nickel foils are powered. The channel is in two dimensions identical (50 μm high and 120 μm wide) to a single cavity of the microplasma arrays while it is two orders of magnitude longer. Unlike the microplasma arrays, the channel provides an additional optical access to the inside of the cavity from the side. The setup was operated with a triangular voltage with a frequency of 10 kHz and an amplitude of up to 700V at atmospheric pressure. Phase resolved emission images were used to investigate the microplasma channel dynamics with line of sight from the top and from the side to the inside of the cavity. The top view images revealed that the discharge in the microplasma channel and the microplasma arrays behave similar. The already known asymmetric discharge behavior, the self-pulsing and the wavelike ignition was also observed in the microplasma channel. For the wavelike ignition in the channel a simple one dimensional model was proposed. With the additional side view images the asymmetric discharge behavior was examined more thoroughly. Unlike in the microplasma arrays, the discharge expands here in both half periods of the applied voltage above the upper edge of the powered electrodes. The discharge extends over a larger width in the half period, in which the potential of the upper electrodes is increasing, while it extends over a larger height in the other half period. Phase resolved images were also used to investigate the ignition phase of the discharge. The discharge ignites in the two half periods on a different height. This was explained by modeling the drift and diffusion of the charged particles between two discharge pulses. The new insights into the discharge dynamics in the microplasma channel will help to understand the behavior of the discharge in the microplasma arrays.

在这里，研究了微等离子体通道。该设计是根据最近提出的模块化微等离子体阵列开发的。设置包括三个堆叠层：一个磁铁，介电箔和由一个120分开的两个镍箔μ米宽间隙。在两个镍箔通电时，磁铁已接地。该信道是在两个维度上是相同的（50 μ米高，120 μm宽）到微等离子体阵列的单个腔，而长度要长两个数量级。与微等离子体阵列不同，该通道提供了从侧面到腔体内部的附加光学通道。该装置在大气压下以三角电压工作，该三角电压的频率为10 kHz，振幅最高为700V。相分辨发射图像用于研究微等离子体通道动力学，其视线从腔体的顶部，侧面到内部。顶视图图像显示微等离子体通道和微等离子体阵列中的放电行为相似。在微等离子体通道中还观察到已知的不对称放电行为，自脉冲和波状点火。对于通道中的波状点火，提出了一种简单的一维模型。使用附加的侧视图图像，可以更彻底地检查不对称放电行为。与微等离子体阵列不同，放电在施加电压的两个半周期中都在通电电极的上边缘上方扩展。放电在上半周期的较大宽度上延伸，其中上电极的电势在增加，而在下半周期的较大范围内延伸。相分辨图像也用于研究放电的点火相。放电在两个半周期内以不同的高度点燃。这是通过对两个放电脉冲之间带电粒子的漂移和扩散进行建模来解释的。