围绕介质球旋转的电荷的高功率辐射的角分布
Angular distribution of high power radiation from a charge rotating around a dielectric ball
摘要：
本文研究了相对论带电粒子沿赤道轨道绕介质球作匀速旋转时辐射的角分布。早些时候，它表明，对于某些值的问题参数和在球材料中的弱吸收的情况下，在一个给定的谐波的辐射强度可以基本上大于相同的电荷在真空中旋转，或在均匀的透明介质具有相同的实部的介电常数作为球材料。这种高功率辐射的产生是切伦科夫辐射的电磁振荡的建设性叠加的结果，在粒子的轨道附近诱导并部分锁定在球内。的角度分布的发射量子的数量进行了调查，这样的高功率辐射。结果表明，辐射主要位于旋转平面附近的角范围内的切伦科夫条件所确定的球表面上的电荷图像的速度。数值分析给出了球的钛酸锶，熔融石英和碲在千兆赫和太赫兹的频率范围。
英文摘要：
We study the angular distribution of the radiation from a relativistic charged particle uniformly rotating along an equatorial orbit around a dielectric ball. Earlier it was shown that for some values of the problem parameters and in the case of weak absorption in the ball material, the radiation intensity on a given harmonic can be essentially larger than that for the same charge rotating in the vacuum or in a homogeneous transparent medium having the same real part of dielectric permittivity as the ball material. The generation of such high power radiation is a consequence of the constructive superposition of electromagnetic oscillations of Cherenkov radiation induced near the trajectory of the particle and partially locked inside the ball. The angular distribution of the number of the emitted quanta is investigated for such high power radiation. It is shown that the radiation is mainly located in the angular range near the rotation plane determined by the Cherenkov condition for the velocity of the charge image on the ball surface. The numerical analysis is given for balls made of strontium titanate, melted quartz and teflon in the gigahertz and terahertz frequency ranges.
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