亚拉莫尔尺度磁场辐射
Radiation from sub-Larmor scale magnetic fields
摘要：
强磁场的自发快速增长在高能量密度环境中相当普遍，伽马射线暴和相对论冲击），重联，激光等离子体相互作用的实验室实验，在那里，它们是由动力学流动不稳定性的韦伯型。通过这些亚拉莫尔尺度的磁场传播的相对论电子辐射的抖动制度，其中的各向异性的磁场和粒子分布产生的辐射有很强的影响。在这里，我们开发的一般理论的抖动辐射，其中包括（i）各向异性磁场和电子速度分布，（ii）被困电子的影响和（iii）扩展的描述，从而建立一个交叉之间的经典抖动和同步加速器制度的辐射粒子的大偏转角。我们的结果是在显着的协议与经典的韦伯不稳定性的粒子模拟得到的辐射光谱。特别有趣的是发病的字段增长时，瞬态硬同步违反光谱是常见的被困人口的主导作用的结果。这种效应可以作为天体物理源和实验室实验中剧烈场增长的独特观测特征。同样有趣的是，具有小尺度场的系统倾向于向小角度抖动区域演化，在某些条件下，小角度抖动区域可以主导源的整体发射。
英文摘要：
Spontaneous rapid growth of strong magnetic fields is rather ubiquitous in high-energy density environments ranging from astrophysical sources (e.g., gamma-ray bursts and relativistic shocks), to reconnection, to laser-plasma interaction laboratory experiments, where they are produced by kinetic streaming instabilities of the Weibel type. Relativistic electrons propagating through these sub-Larmor-scale magnetic fields radiate in the jitter regime, in which the anisotropy of the magnetic fields and the particle distribution have a strong effect on the produced radiation. Here we develop the general theory of jitter radiation, which includes (i) anisotropic magnetic fields and electron velocity distributions, (ii) the effects of trapped electrons and (iii) extends the description to large deflection angles of radiating particles thus establishing a cross-over between the classical jitter and synchrotron regimes. Our results are in remarkable agreement with the radiation spectra obtained from particle-in-cell simulations of the classical Weibel instability. Particularly interesting is the onset of the field growth, when the transient hard synchrotron-violating spectra are common as a result of the dominant role of the trapped population. This effect can serve as a distinct observational signature of the violent field growth in astrophysical sources and lab experiments. It is also interesting that a system with small-scale fields tends to evolve toward the small-angle jitter regime, which can, under certain conditions, dominate the overall emission of a source.
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