期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.135002
关键词
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资金
- National Basic Research Program of China
- National Science Foundation of China [11121504, 11129503, 11075105]
- U.S. Department of Energy [DE-FC02-07ER41500, DE-FG02-92ER40727]
- National Science Foundation [NSF PHY-0904039, PHY-0936266]
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 up-ramp density profile 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 (similar to nC) distinguish the final sheet. DOI: 10.1103/PhysRevLett.110.135002
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