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Longitudinal current profile reconstruction from a wakefield response in plasmas and structures
Physical Review Accelerators and Beams ( IF 1.7 ) Pub Date : 2020-12-17 , DOI: 10.1103/physrevaccelbeams.23.121303
R. Roussel , G. Andonian , J. B. Rosenzweig , S. S. Baturin

Present-day and next-generation accelerators, particularly for applications in driving wakefield-based schemes, require longitudinal beam shaping and attendant longitudinal characterization for experimental optimization. Here we present a diagnostic method which reconstructs the longitudinal beam profile at the location of the wakefield-generating source. The methods described derive the longitudinal profile of a charged particle beam solely from measurement of the time-resolved centroid energy change due to wakefield effects. As such, they are insensitive to the beam losses in post-interaction transport often found in common diagnostics. The reconstruction technique is based on a deconvolution algorithm that is fully generalizable to any analytically or numerically calculable Green’s function for the wakefield excitation mechanism. This method is shown to yield precise features in the longitudinal current distribution reconstruction. We demonstrate the accuracy and efficacy of this technique using simulations and experimental examples, in both plasmas and dielectric structures, and compare them to experimentally measured longitudinal beam profiles. The limits of resolution and applicability to relevant scenarios are also examined.

中文翻译:

根据等离子体和结构中的尾场响应重建纵向电流分布

当前和下一代加速器,特别是用于驱动基于尾场的方案中的加速器,需要纵向波束成形和伴随的纵向特性以进行实验优化。在这里,我们提出一种诊断方法,该方法可以在产生尾波场的源位置重建纵向光束轮廓。所描述的方法仅通过测量由于尾波场效应而引起的时间分辨质心能量变化来得出带电粒子束的纵向轮廓。这样,它们对通常在诊断程序中经常发现的相互作用后传输中的光束损失不敏感。重建技术基于反卷积算法,该算法可以完全推广到用于尾场激励机制的任何可解析或数值计算的格林函数。该方法在纵向电流分布重建中显示出精确的特征。我们使用模拟和实验示例在等离子体和介电结构中演示了该技术的准确性和有效性,并将它们与实验测量的纵向光束轮廓进行了比较。还检查了分辨率和适用于相关方案的限制。
更新日期:2020-12-17
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