期刊
NATURE COMMUNICATIONS
卷 4, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/ncomms2988
关键词
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资金
- US Department of Energy (DOE) [DE-FG03-96ER40954, DE-FG02-07ER54945]
- US National Science Foundation [PHY-0936283]
- DOE [DE-FG02-12ER41794]
- NNSA [DE-FC52-08NA28512]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1004321] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [0936283] Funding Source: National Science Foundation
Laser-plasma accelerators of only a centimetre's length have produced nearly monoenergetic electron bunches with energy as high as 1 GeV. Scaling these compact accelerators to multi-gigaelectronvolt energy would open the prospect of building X-ray free-electron lasers and linear colliders hundreds of times smaller than conventional facilities, but the 1 GeV barrier has so far proven insurmountable. Here, by applying new petawatt laser technology, we produce electron bunches with a spectrum prominently peaked at 2 GeV with only a few per cent energy spread and unprecedented sub-milliradian divergence. Petawatt pulses inject ambient plasma electrons into the laser-driven accelerator at much lower density than was previously possible, thereby overcoming the principal physical barriers to multi-gigaelectronvolt acceleration: dephasing between laser-driven wake and accelerating electrons and laser pulse erosion. Simulations indicate that with improvements in the laser-pulse focus quality, acceleration to nearly 10 GeV should be possible with the available pulse energy.
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