GETaLM: A generator for electron tagger and luminosity monitor for electron - proton and ion collisions

The study of elastic bremsstrahlung and electron tagging in electron-proton or ion collisions is gaining importance with the planned construction of several experimental facilities focused on deep-inelastic scattering (DIS) measurements. This paper describes a program which generates bremsstrahlung photons in electron-proton and electron-ion interactions as well as scattered electrons in bremsstrahlung processes and in a quasi-real photon approximation to the general DIS process. The effects of electron beam divergence and the spread of the interaction vertex are implemented. The program can be used as an input to simulations of instrumentation for bremsstrahlung photon detection, luminosity measurements, electron tagging, and the determination of the cross sections of corresponding processes.

随着若干聚焦于深度非弹性散射（deep-inelastic scattering, DIS）测量的实验装置规划建设，电子-质子或离子碰撞中的弹性韧致辐射（elastic bremsstrahlung）与电子标记研究正日益受到重视。本文介绍一款程序，可生成电子-质子与电子-离子相互作用过程中的韧致辐射光子，同时还可生成韧致辐射过程中的散射电子，以及采用准实光子近似（quasi-real photon approximation）的一般深度非弹性散射过程中的散射电子。该程序已纳入电子束发散度与相互作用顶点展宽的效应修正。此程序可作为韧致辐射光子探测装置模拟、束流亮度测量、电子标记以及对应反应截面测定等相关模拟的输入文件。