Abstract

The results of a numerical analysis of the dynamics of electrons in a beam injected into air with an energy of several tens of MeV and focused by the field of an accompanying electromagnetic radiation (EMR) wave at a full stopping distance are presented. The main feature is that the electrons travel the main part of the path in a radial focusing field, which provides beam transport. During the motion of an electron beam, multiple collisions occur between the particles of the beam and air molecules. As a result of these collisions, the radius of the electron beam increases. To determine the increase in the beam radius, the external fields under which the electron moves between two neighboring collisions should be taken into account. Since electrons collude with gas molecules randomly, the root-mean-square radial deviation of electrons from the accelerator axis was calculated. Transverse dimension of the electron beam and characteristics of the tracking field are considered. A twofold increase in the permissible root-mean-square deviation is shown to lead to a significant (by a factor of 16) decrease in the required microwave power of the tracking wave. A scheme for obtaining electron beams (and the corresponding bremsstrahlung flow) is theoretically substantiated.

中文翻译：

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使用线性电子加速器的轫致辐射处理大型物体

摘要

提出了对以数十 MeV 能量注入空气中并在全停止距离处由伴随电磁辐射 (EMR) 波场聚焦的电子束动力学进行数值分析的结果。主要特征是电子在径向聚焦场中行进路径的主要部分，从而提供束流传输。在电子束运动过程中，电子束粒子与空气分子之间会发生多次碰撞。这些碰撞的结果是，电子束的半径增加。为了确定光束半径的增加，应考虑电子在两次相邻碰撞之间移动的外部场。由于电子与气体分子随机串扰，因此计算了电子相对于加速器轴的均方根径向偏差。考虑了电子束的横向尺寸和跟踪场的特性。允许的均方根偏差增加两倍会导致跟踪波所需的微波功率显着降低（16 倍）。从理论上证实了一种获得电子束（以及相应的轫致辐射流）的方案。