We report a systematic numerical study regarding the control of discharge pulse number in an atmospheric helium dielectric-barrier discharge with multiple current pulses per half cycle. The results indicated that by replacing the original sinusoidal applied voltage with a peak-levelled one, the manipulation of current pulse number in each discharge half cycle could be achieved, and the initial moment of flat-top stage t0, which reflects the duration of peak-levelled applied voltage, was set to be the controlling parameter. With the increase of flat-top duration, the current pulse number per half cycle decreased monotonously from the original value to zero. In this process, the current amplitude elevated, the peak phase delayed, and the energy efficiency in terms of electron production enhanced. Further analyses revealed that the above alterations in discharge performance were not caused by changes in seed electron level of the discharge, but by the variations in discharge current components and surface charge level. Finally, based on the criteria of pulse number alteration, a preliminary analytical method was proposed to switch the original multiple-current-pulse discharge into a single-current-pulse one. The results obtained in this work are expected to help achieve the mode manipulation and stabilization of the discharge in industrial application scenarios.

中文翻译：

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用每半周期多个电流脉冲控制大气氦介质阻挡放电中的放电脉冲数

我们报告了关于在每半周期具有多个电流脉冲的大气氦介质阻挡放电中控制放电脉冲数的系统数值研究。结果表明，将原始正弦施加电压替换为峰值电平，可以实现对每个放电半周期电流脉冲数的操纵，平顶阶段的初始时刻t0反映了峰值持续时间-水平施加电压，被设置为控制参数。随着平顶持续时间的增加，每半个周期的电流脉冲数从原始值单调减少到零。在这个过程中，电流幅度升高，峰值相位延迟，电子产生的能量效率提高。进一步的分析表明，上述放电性能的变化不是由放电种子电子能级的变化引起的，而是由放电电流分量和表面电荷水平的变化引起的。最后，基于脉冲数变化的判据，提出了一种将原来的多电流脉冲放电转换为单电流脉冲放电的初步分析方法。这项工作获得的结果有望帮助实现工业应用场景中的模式操纵和放电稳定。提出了一种初步的分析方法，将原来的多电流脉冲放电转换为单电流脉冲放电。这项工作获得的结果有望帮助实现工业应用场景中的模式操纵和放电稳定。提出了一种初步的分析方法，将原来的多电流脉冲放电转换为单电流脉冲放电。这项工作获得的结果有望帮助实现工业应用场景中的模式操纵和放电稳定。