Abstract

The principles and results of the development of an electron spectrometer for a facility for the laser acceleration of electrons, which is being created at the Institute of Laser Physics, Siberian Branch, Russian Academy of Sciences, jointly with the Institute of Nuclear Physics (BINP), Siberian Branch, Russian Academy of Sciences, are described. The spectrometer uses a permanent dipole magnet and a phosphor screen and is designed for an energy range of 15–150 MeV. The main requirements that determine the features of this spectrometer are as follows: the location of the basic elements in a vacuum chamber of limited volume and operation in the mode of single pulses at small charges in a pulse, at a level of 1–10 pC. Methods for selecting the measurement scheme and geometry and the requirements for the elements that constitute the spectrometer and their selection are described. It is demonstrated that the beam collimation at the spectrometer entrance allows achievement of an energy resolution of up to 5% at the high-energy limit of the measurement range. The results of testing a spectrometer prototype on the VEPP-5 beam at the BINP, at which the sensitivity of registering the charge density at a level of 0.01 pC/mm² was experimentally achieved, are presented.

中文翻译：

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用于测量小电荷的单个激光加速电子束的特性的光谱仪

摘要

开发用于电子激光加速的电子光谱仪的原理和结果，该光谱仪是由俄罗斯科学院西伯利亚分校激光物理研究所和核物理研究所（BINP）共同创建的描述了俄罗斯科学院西伯利亚分校的资料。该光谱仪使用永久性偶极磁体和荧光屏，设计用于15–150 MeV的能量范围。决定此光谱仪功能的主要要求如下：有限体积的真空室内基本元件的位置，以及在单个脉冲下以小脉冲电荷在1–10 pC的水平下工作的方式。描述了选择测量方案和几何形状的方法以及构成光谱仪的元素的要求及其选择。证明了在分光计入口处的光束准直允许在测量范围的高能量极限下实现高达5％的能量分辨率。在BINP上的VEPP-5光束上测试光谱仪原型的结果，在该波长下记录电荷密度的灵敏度为0.01 pC / mm²是通过实验实现的，现介绍。