Measurement of Magnetic-Field Structures in a Laser-Wakefield Accelerator
Measurement of Magnetic-Field Structures in a Laser-Wakefield Accelerator
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DOI：
10.1103/physrevlett.105.115002
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发表时间：
2010-09-07
影响因子：
8.6
通讯作者：
Krushelnick, K. M.
中科院分区：
文献类型：
--
作者：
Kaluza, M. C.;Schlenvoigt, H. -P.;Krushelnick, K. M.
本文介绍了自注入激光尾流场加速器腔内磁场的实验测量结果。法拉第旋转被用来确定存在的多兆高斯场，约束到一个横向尺寸相当于等离子体波长类似于λ（p）和几个λ（p）纵向。场快速产生并随驱动激光移动。在我们的实验中，磁场的出现与相对论电子的产生相关，这表明它们与非线性等离子体波的增长和破波有着内在的联系。数值模拟证实了这种演变，表明这些测量提供了高的空间和时间分辨率的韦克菲尔德的演变洞察。
Experimental measurements of magnetic fields generated in the cavity of a self-injecting laser-wakefield accelerator are presented. Faraday rotation is used to determine the existence of multimegagauss fields, constrained to a transverse dimension comparable to the plasma wavelength similar to lambda(p) and several lambda(p) longitudinally. The fields are generated rapidly and move with the driving laser. In our experiment, the appearance of the magnetic fields is correlated with the production of relativistic electrons, indicating that they are inherently tied to the growth and wave breaking of the nonlinear plasma wave. This evolution is confirmed by numerical simulations, showing that these measurements provide insight into the wakefield evolution with high spatial and temporal resolution.