Abstract

The undulator radiation of positrons channeled in a crystalline undulator with sections (CUS) is investigated theoretically taking into account the effect of dielectric polarization of the crystalline medium. The configuration of CUS preserves planar channeling of positrons with a given energy. An analytical expression is obtained for the spectral distribution of the number of radiated photons. The features of this spectrum are presented. As expected, such a modification of the crystalline undulator results in the gain of radiation owing to the constructive interference of the radiation fields formed in separate sections. The optimal parameters of the CUS are found. Such micro-emitters will find wide practical applications because they generate directional beams of both hard and soft photons.

中文翻译：

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带截面的晶体波荡器中正电子辐射的增益和特征

摘要

考虑到晶体介质的介电极化的影响，理论上研究了在具有截面的晶体波荡器 (CUS) 中引导的正电子的波荡器辐射。CUS 的配置保留了具有给定能量的正电子的平面通道。获得了辐射光子数的光谱分布的解析表达式。介绍了该频谱的特征。正如预期的那样，由于在单独部分中形成的辐射场的相长干涉，晶体波荡器的这种修改导致辐射增益。找到了 CUS 的最佳参数。这种微型发射器会产生广泛的实际应用，因为它们会产生硬光子和软光子的定向光束。