Theoretical Justification of Application Possibility of Different Order Root-polynomial Functions for Interpolation and Approximation of Boundary Trajectory of Electron Beam

Igor Melnyk, A. V. Pochynok
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Abstract

In this paper on a basis of functional analysis methods we justified theoretically the possibility of different orders root-polynomial functions application for interpolation and approximation of the boundary trajectory of an electron beam in case of its propagation in ionized gas with compensation of the space charge of the beam electrons. It is shown, that the root-polynomial functions satisfy to the second-order differential equation, describing the boundary trajectory of the beam electrons under such physical conditions. The results of interpolation and approximation of the boundary trajectory of the electron beam by root-polynomial functions from the second to the fifth order under the following physical conditions are presented. The interpolation results are compared with the corresponded results of the differential equation solution for the boundary trajectory of the electron beam using Runge-Kutta numerical method of the fourth order. These results are considered as reference ones for the interpolation task. To solve the approximation problem, in this paper an iterative algorithm based on the calculation of both values of the function and its derivatives at reference points is proposed. The approximation task is solved for a sample of numerical data obtained by experimental electron-beam equipment for real processes of current electron-beam technologies, which led to a rather large value of the experimental measurement error due to the effect of random factors associated with thermal treatment of products with electron beam. Test calculations show that the error of interpolation and approximation of numerical data, describing the boundary trajectory of electron beam in case of its propagation in ionized gas, does not exceed a few percent. The theoretical and practical results obtained in this paper are interesting for a wide range of specialists who are engaged in the physics of electron beams, the development of electron-beam technological equipment and implementation of current electron-beam technologies into industry.

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不同阶次的根-多项式函数在电子束边界轨迹插值和逼近中的应用可能性的理论依据
摘要 本文以函数分析方法为基础,从理论上论证了在补偿电子束空间电荷的情况下,电子束在电离气体中传播时,应用不同阶次的根-多项式函数对电子束的边界轨迹进行插值和近似的可能性。研究表明,根多项式函数满足二阶微分方程,描述了电子束在这种物理条件下的边界轨迹。本文介绍了在以下物理条件下,根多项式函数从二阶到五阶对电子束边界轨迹进行插值和近似的结果。插值结果与使用四阶 Runge-Kutta 数值方法求解电子束边界轨迹微分方程的相应结果进行了比较。这些结果被视为插值任务的参考结果。为了解决近似问题,本文提出了一种基于计算参考点的函数值及其导数的迭代算法。近似任务是通过实验电子束设备获得的数值数据样本来解决的,这些数据是在当前电子束技术的实际过程中获得的,由于与电子束热处理产品相关的随机因素的影响,导致实验测量误差值相当大。试验计算表明,描述电子束在电离气体中传播的边界轨迹的插值和近似数值数据的误差不超过百分之几。对于从事电子束物理学、电子束技术设备开发以及将现有电子束技术应用于工业领域的众多专家来说,本文所获得的理论和实践成果具有重要意义。
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来源期刊
Radioelectronics and Communications Systems
Radioelectronics and Communications Systems Engineering-Electrical and Electronic Engineering
CiteScore
2.10
自引率
0.00%
发文量
9
期刊介绍: Radioelectronics and Communications Systems  covers urgent theoretical problems of radio-engineering; results of research efforts, leading experience, which determines directions and development of scientific research in radio engineering and radio electronics; publishes materials of scientific conferences and meetings; information on scientific work in higher educational institutions; newsreel and bibliographic materials. Journal publishes articles in the following sections:Antenna-feeding and microwave devices;Vacuum and gas-discharge devices;Solid-state electronics and integral circuit engineering;Optical radar, communication and information processing systems;Use of computers for research and design of radio-electronic devices and systems;Quantum electronic devices;Design of radio-electronic devices;Radar and radio navigation;Radio engineering devices and systems;Radio engineering theory;Medical radioelectronics.
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