Kangnan Jiang, K. Feng, Hao Wang, Xiaojun Yang, P. Bai, Yi Xu, Y. Leng, Wentao Wang, Ruxin Li
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引用次数: 0
摘要
摘要利用偶极子聚焦传输线实现了电子发射度的单次测量。由于气泡中纵向加速场和横向聚焦(散焦)场的耦合作用,基于激光尾流场加速(LWFA)的电子的betatron相位是能量依赖的。相对于中心能量,相位补偿后的相空间呈现出切片信息。在实验测得的0.27 mm mrad能谱中,拟合了电子束在不同能量片上的横向尺寸。薄片发射度的诊断有助于局部电子质量的控制,这对基于lwfa的自由电子激光器的发展具有重要意义。准三维细胞内粒子模拟结果与实验结果和分析结果吻合较好。
Measurement of electron beam transverse slice emittance using a focused beamline
Abstract A single-shot measurement of electron emittance was experimentally accomplished using a focused transfer line with a dipole. The betatron phase of electrons based on laser wakefield acceleration (LWFA) is energy dependent owing to the coupling of the longitudinal acceleration field and the transverse focusing (defocusing) field in the bubble. The phase space presents slice information after phase compensation relative to the center energy. Fitting the transverse size of the electron beam at different energy slices in the energy spectrum measured 0.27 mm mrad in the experiment. The diagnosis of slice emittance facilitates local electron quality manipulation, which is important for the development of LWFA-based free electron lasers. The quasi-3D particle-in-cell simulations matched the experimental results and analysis well.
期刊介绍:
High Power Laser Science and Engineering (HPLaser) is an international, peer-reviewed open access journal which focuses on all aspects of high power laser science and engineering.
HPLaser publishes research that seeks to uncover the underlying science and engineering in the fields of high energy density physics, high power lasers, advanced laser technology and applications and laser components. Topics covered include laser-plasma interaction, ultra-intense ultra-short pulse laser interaction with matter, attosecond physics, laser design, modelling and optimization, laser amplifiers, nonlinear optics, laser engineering, optical materials, optical devices, fiber lasers, diode-pumped solid state lasers and excimer lasers.