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Observations of Coherent Optical Transition Radiation Interference Fringes Generated by Laser Plasma Accelerator Electron Beamlets

机译:激光等离子加速器电子束产生的相干光学过渡辐射干扰条纹的观察

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We report initial observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched electrons from laser-driven plasma accelerators (LPAs). These are revealed in the angular distribution patterns obtained by a CCD camera with the optics focused at infinity, or the far-field, viewing a Wartski two-foil interferometer. The beam divergences deduced by comparison to results from an analytical model are sub-mrad, and they are smaller than the ensemble vertical beam divergences measured at the downstream screen of the electron spectrometer. The transverse sizes of the beamlet images were obtained with focus at the object, or near field, and were in the few-micron regime as reported by LaBerge et al. [8]. The enhancements in intensity are significant relative to incoherent optical transition radiation (OTR) enabling multiple cameras to view each shot. We present two-foil interferometry effects coherently enhanced in both the 100-TW LPA at 215 MeV energy at Helmholtz-Zentrum Dresden-Rossendorf and the PW LPA at 1.0-GeV energy at the University of Texas-Austin. A transverse emittance estimate is reported for a microbunched beamlet example generated within the plasma bubble.
机译:我们报告了由来自激光驱动的等离子体加速器(LPA)产生的微型光学转换辐射干涉机(COTRI)图案的初始观测。这些在由CCD相机获得的角度分布图案中揭示,其中光学器件聚焦在无穷大,或远场,观察Wartski双箔干涉仪。通过比较与分析模型的结果推导的光束分流是子MRAD,它们小于电子光谱仪的下游屏幕测量的集合垂直束分路。在物体或附近的焦点上获得了横向图像的横向尺寸,并且在Laberge等人报告的几米下方的几微米制度中。 [8]。强度的增强相对于不连贯的光学转换辐射(OTR)是显着的,使得能够查看每个镜头。我们在赫尔莫霍尔茨 - Zentrum Dresden-Rossendorf和德克萨斯州大学的1.0-GEV能量下,在100-TW LPA的两种融合效应在100-TW LPA中连贯地增强的两种铝箔干涉测量效应。据报道,在等离子体泡沫中产生的微型束束示例报告横向发射率估计。

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