作者:S. Zivanov、J. Zivkovic、I. Stefanovic、S. Vrhovac、Z. Lj. Petrovic
DOI:10.1051/epjap:2000145
日期:2000.7
We have measured the basic characteristics of low current diffuse discharges in argon for low pressures. The data for the voltage current characteristics and negative differential resistance were obtained together with the data for the frequency and for the damping coefficient of the induced oscillations. These data were compared with the predictions of a simple analytic model of Phelps, Petrović and Jelenković [A.V. Phelps, Z.Lj. Petrović and B.M. Jelenković, Phys. Rev. E 47, 2825 (1993)] and it was found that, while most observables may be represented correctly, there is a systematic discrepancy between the predictions for frequency of induced oscillations based on the data for transport coefficients from the literature and measurements. The basic idea of the present work is thus to check the fundamental assumptions of the theory and to extend the application of the experiment to study the transition to constrictions in order to initiate modifications of the theory to cover the transition to the constricted regime. Very good agreement was found between the spatial profiles of the electric field calculated from the model and the data obtained from the spatial profiles of emission and these data may be extended to follow the transition to the constricted regime and the development of the cathode sheath.
我们测量了低压氩气中低电流漫射放电的基本特性。我们获得了电压电流特性和负微分电阻的数据,以及频率和诱导振荡阻尼系数的数据。这些数据与 Phelps、Petrović 和 Jelenković 的简单分析模型[A.V. Phelps, Z.Lj. Petrović and B.M. Jelenković] 的预测进行了比较。Petrović和B.M. Jelenković,Phys. Rev. E 47, 2825 (1993)],结果发现,虽然大多数观测数据都能正确表示,但根据文献中的传输系数数据对诱导振荡频率的预测与测量结果之间存在系统性差异。因此,本研究的基本思路是检验理论的基本假设,并将实验的应用扩展到研究向约束的过渡,从而开始对理论进行修改,以涵盖向约束机制的过渡。根据模型计算出的电场空间剖面与根据发射空间剖面获得的数据之间存在很好的一致性,这些数据可用于跟踪向收缩状态的过渡和阴极鞘的发展。