Controlling fast electron beam divergence using two laser pulses
R. H. H. Scott, C. Beaucourt, H. -P. Schlenvoigt, K. Markey, K. L. Lancaster, C. P. Ridgers, C. M. Brenner, J. Pasley, R. J. Gray, I. O. Musgrave, A. P. L Robin… 展开作者
R. H. H. Scott, C. Beaucourt, H. -P. Schlenvoigt, K. Markey, K. L. Lancaster, C. P. Ridgers, C. M. Brenner, J. Pasley, R. J. Gray, I. O. Musgrave, A. P. L Robinson, K. Li, M. M. Notley, J. R. Davies, S. D. Baton, J. J. Santos, J. -L. Feugeas, Ph. Nicolaï, G. Malka, V. T. Tikhonchuk, P. McKenna, D. Neely, S. J. Rose, P. A. Norreys
This paper describes the first experimental demonstration of the guiding of a relativistic electron beam in a solid target using two co-linear, relativistically intense, picosecond laser pulses. The first pulse creates a magnetic field which guides the higher current fast electron beam generated by the second pulse. The effects of intensity ratio, delay, total energy and intrinsic pre-pulse are examined. Thermal and Kα imaging showed reduced emission size, increased peak emission and increased total emission at delays of 4 - 6 ps, an intensity ratio of 10 : 1 (second:first) and a total energy of 186 J. In comparison to a single, high contrast shot, the inferred fast electron divergence is reduced by 2.7 times, while the fast electron current density is increased by a factor of 1.8. The enhancements are reproduced with modelling and are shown to be due to the self-generation of magnetic fields. Such a scheme could be of considerable benefit to fast ignition inertial fusion.
Laguerre-Gaussian pulses for spin-polarized ion beam acceleration
Forschungszentrum Jülich（于利希研究中心）；Heinrich-Heine-Universität Düsseldorf（杜塞尔多夫大学）；National University of Defense Technology（国防科技大学）；Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf（杜塞尔多夫大学理论物理研究所I）
Two-Pulse Ionization Injection into Quasi-Linear Laser Wakefields
我们描述了一种用于控制电子注入到由引导驱动脉冲驱动的准线性尾场的方案，该方案通过具有短瑞利范围的共线注入激光脉冲电离掺杂剂物种。该方案通过粒子模拟进行了分析，结果显示电子的受控注入和加速达到370 MeV的能量，相对能量扩展为2%，归一化横向发射度为3.0 μm。这是原始APS论文的arXiv版本。它应该被引用为N。Bourgeois，J. Cowley，and S. M. Hooker，Phys. Rev. Lett. 111，155004（2013）。APS链接：http://link.aps.org/doi/10.1103/PhysRevLett.111.155004
