期刊
SCIENCE ADVANCES
卷 6, 期 22, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aaz7240
关键词
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资金
- National Key Research and Development Program of China [2018YFA0404802]
- National Natural Science Foundation of China [11721091, 11991074, 11775144, 11774227, 11622547, 11775302]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA25050100, XDA25050300]
- Science Challenge Project [TZ2018005]
- China Scholarship Council
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie [743949]
- project EuPRAXIA [653782]
- LASERLAB-EUROPE [654148]
- EuCARD-2 [312453]
- ARIES [730871]
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/N028694/1]
- Extreme Light Infrastructure (ELI) European Projects
- EPSRC [EP/G056803/1, EP/L000237/1, EP/R029148/1]
- Marie Curie Actions (MSCA) [743949] Funding Source: Marie Curie Actions (MSCA)
- EPSRC [EP/R029148/1, EP/N028694/1, EP/L000237/1] Funding Source: UKRI
- STFC [ST/P002056/1] Funding Source: UKRI
Recent developments in laser-wakefield accelerators have led to compact ultrashort X/gamma-ray sources that can deliver peak brilliance comparable with conventional synchrotron sources. Such sources normally have low efficiencies and are limited to 10(7-8) photons/shot in the keV to MeV range. We present a novel scheme to efficiently produce collimated ultrabright gamma-ray beams with photon energies tunable up to GeV by focusing a multi-petawatt laser pulse into a two-stage wakefield accelerator. This high-intensity laser enables efficient generation of a multi-GeV electron beam with a high density and tens-nC charge in the first stage. Subsequently, both the laser and electron beams enter into a higher-density plasma region in the second stage. Numerical simulations demonstrate that more than 10(12) gamma-ray photons/shot are produced with energy conversion efficiency above 10% for photons above 1 MeV, and the peak brilliance is above 10(26) photons s(-1) mm(-2) mrad-(2) per 0.1% bandwidth at 1 MeV. This offers new opportunities for both fundamental and applied research.
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