Simulation of deflection and photon emission of ultra-relativistic electrons and positrons in a quasi-mosaic bent silicon crystal

IF 1.5 4区 物理与天体物理 Q3 OPTICS
Paulo E Ibañez-Almaguer, Germán Rojas-Lorenzo, Maykel Márquez-Mijares, Jesús Rubayo-Soneira, Gennady B Sushko, Andrei V Korol, Andrey V Solov’yov
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Abstract

A comprehensive numerical investigation has been conducted on the angular distribution and spectrum of radiation emitted by 855 MeV electron and positron beams while traversing a ‘quasi-mosaic’ bent silicon (111) crystal. This interaction of charged particles with a bent crystal gives rise to various phenomena such as channeling, dechanneling, volume reflection, and volume capture. The crystal’s geometry, emittance of the collimated particle beams, as well as their alignment with respect to the crystal, have been taken into account as they are essential for an accurate quantitative description of the processes. The simulations have been performed using a specialized relativistic molecular dynamics module implemented in the MBN Explorer package. The angular distribution of the particles after traversing the crystal has been calculated for beams of different emittances as well as for different anticlastic curvatures of the bent crystals. For the electron beam, the angular distributions of the deflected particles and the spectrum of radiation obtained in the simulations are compared with the experimental data collected at the Mainz Microtron facility. For the positron beam such calculations have been performed for the first time. We predict significant differences in the angular distributions and the radiation spectra for positrons versus electrons.
模拟准马赛克弯曲硅晶体中超相对论电子和正电子的偏转与光子发射
我们对 855 兆电子伏电子束和正电子束穿过 "准马赛克 "弯曲硅 (111) 晶体时发出的辐射的角度分布和光谱进行了全面的数值研究。带电粒子与弯曲晶体的相互作用会产生各种现象,如通道、去通道、体积反射和体积捕获。晶体的几何形状、准直粒子束的发射率以及它们相对于晶体的排列方式都被考虑在内,因为它们对于准确定量地描述这些过程至关重要。模拟是使用 MBN Explorer 软件包中专门的相对论分子动力学模块进行的。针对不同发射率的光束以及弯曲晶体的不同反弹性曲率,计算了粒子穿过晶体后的角度分布。对于电子束,模拟得到的偏转粒子的角度分布和辐射光谱与在美因茨微创设备上收集到的实验数据进行了比较。对于正电子束,我们首次进行了此类计算。我们预测正电子与电子的角度分布和辐射光谱存在明显差异。
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来源期刊
CiteScore
3.60
自引率
6.20%
发文量
182
审稿时长
2.8 months
期刊介绍: Published twice-monthly (24 issues per year), Journal of Physics B: Atomic, Molecular and Optical Physics covers the study of atoms, ions, molecules and clusters, and their structure and interactions with particles, photons or fields. The journal also publishes articles dealing with those aspects of spectroscopy, quantum optics and non-linear optics, laser physics, astrophysics, plasma physics, chemical physics, optical cooling and trapping and other investigations where the objects of study are the elementary atomic, ionic or molecular properties of processes.
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