Abstract

A method for controlling the focusing of an ionizing-radiation beam, for example, a beam of charged particles, is proposed. Ionization is one of the most widely used radiation-detection methods. The effect of the recombination of charge carriers in the working substance of the detector, accompanying ionization, is usually considered as undesirable, which reduces the accuracy of measuring the radiation parameters. However, this effect can be useful and be the basis of a method for determining the maximum degree of focusing of a beam of particles or ionizing radiation. At a fixed value of the total beam current (ionizing-radiation flux), the maximum focusing is determined from the minimum value of the ionization current in a wide-aperture ionization chamber, which is used as a detector. The signal of the ionization chamber changes during focusing even at a fixed value of the beam current due to the dependence of the intensity of the recombination of charge carriers in the working substance of the chamber on their bulk density. The bulk density of carriers, in turn, is proportional to the distribution density of particles of the ionizing-radiation beam in the volume of the working medium of the ionization chamber.

中文翻译：

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电离复合过程作为指示带电粒子束或电离辐射的聚焦程度的方法

摘要

提出了一种用于控制电离辐射束(例如，带电粒子束)的聚焦的方法。电离是最广泛使用的辐射检测方法之一。检测器工作物质中电荷载流子的复合效应，伴随着电离，通常被认为是不希望的，这会降低测量辐射参数的准确性。然而，这种效应可能是有用的并且是确定粒子束或电离辐射的最大聚焦程度的方法的基础。在总束流（电离辐射通量）的固定值下，最大聚焦由用作检测器的大口径电离室中的电离电流的最小值确定。由于电离室工作物质中电荷载流子的复合强度与其体积密度的相关性，电离室的信号在聚焦期间甚至在束流的固定值下也会发生变化。载体的体积密度又与电离辐射束的粒子在电离室的工作介质体积中的分布密度成比例。