基于“端点”中瞬时电荷加速的电磁辐射过程的一般描述
General description of electromagnetic radiation processes based on instantaneous charge acceleration in `endpoints'
摘要：
提出了一种计算加速带电粒子电磁辐射的新方法。我们的配方-“终点配方”-结合了文献中开发的许多结果，这些结果与使用一个完整的、完全通用的治疗方法从粒子加速产生的辐射有关。我们通过一系列离散的、瞬时加速度事件或“终点”来描述粒子运动，每个这样的事件都被视为一个发射源。这种方法隐含地允许粒子的创建/销毁，并适合于直接在时域或频域中的数值实现。在本文中，我们证明了我们的方法计算带电粒子加速辐射场的完整的一般性，并显示它如何减少到经典的命名辐射过程，如同步加速器，塔姆的描述瓦维洛夫切伦科夫，过渡辐射在适当的限制。使用这个公式，我们立即能够回答悬而未决的问题，无线电发射的现象，从超高能粒子相互作用在地球大气层和月球。特别是，我们的配方使它明显的Askaryan效应（相干无线电波辐射从高能量粒子级联在稠密介质）的主要发射组件来自相干的'韧致辐射'从粒子加速，而不是相干瓦维洛夫-切伦科夫辐射。
英文摘要：
We present a new methodology for calculating the electromagnetic radiation from accelerated charged particles. Our formulation --- the `endpoint formulation' --- combines numerous results developed in the literature in relation to radiation arising from particle acceleration using a complete, and completely general, treatment. We do this by describing particle motion via a series of discrete, instantaneous acceleration events, or `endpoints', with each such event being treated as a source of emission. This method implicitly allows for particle creation/destruction, and is suited to direct numerical implementation in either the time- or frequency-domains. In this paper, we demonstrate the complete generality of our method for calculating the radiated field from charged particle acceleration, and show how it reduces to the classical named radiation processes such as synchrotron, Tamm's description of Vavilov-Cherenkov, and transition radiation under appropriate limits. Using this formulation, we are immediately able to answer outstanding questions regarding the phenomenology of radio emission from ultra-high-energy particle interactions in both the Earth's atmosphere and the Moon. In particular, our formulation makes it apparent that the dominant emission component of the Askaryan Effect (coherent radio-wave radiation from high-energy particle cascades in dense media) comes from coherent `bremsstrahlung' from particle acceleration, rather than coherent Vavilov-Cherenkov radiation.
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