Dense Attosecond Electron Sheets from Laser Wakefields Using an Up-Ramp Density Transition
Physical Review Letters
2013) Dense attosecond electron sheets from laser wakefields using an up-ramp density transition. Physical Review Letters, 110 (13). ISSN 0031-9007 Strathprints is designed to allow users to access the research output of the University of Strathclyde. Controlled electron injection into a laser-driven wakefield at a well defined space and time is reported based on particle-in-cell simulations. Key novel ingredients are an underdense plasma target with an upramp density profile followed by a
... followed by a plateau and a fairly large laser focus diameter that leads to an essentially one-dimensional (1D) regime of laser wakefield, which is different from the bubble (complete blowout) regime occurring for tightly focused drive beams. The up-ramp profile causes 1D wave breaking to occur sharply at the up-ramp-plateau transition. As a result, it generates an ultrathin (few nanometer, corresponding to attosecond duration), strongly overdense relativistic electron sheet that is injected and accelerated in the wakefield. A peaked electron energy spectrum and high charge ($ nC) distinguish the final sheet.