Journal
NATURE PHOTONICS
Volume 8, Issue 1, Pages 29-32Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2013.314
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Funding
- US Department of Energy [DE-FG02-05ER15663]
- Defense Threat Reduction Agency [HDTRA1-11-C-0001]
- Air Force Office for Scientific Research [FA 9550-08-1-0232, FA9550-11-1-0157]
- Department of Homeland Security [2007-DN-077-ER0007-02]
- Defense Advanced Research Projects Agency [FA9550-09-1-0009]
- USSTRATCOM [FA4600-12-D-9000]
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The maximum achievable photon energy of compact, conventional, Compton-scattering X-ray sources is currently limited by the maximum permissible field gradient of conventional electron accelerators(1,2). An alternative compact Compton X-ray source architecture with no such limitation is based instead on a high-field-gradient laser-wakefield accelerator(3-6). In this case, a single high-power (100 TW) laser system generates intense laser pulses, which are used for both electron acceleration and scattering. Although such all-laser-based sources have been demonstrated to be bright and energetic in proof-of-principle experiments(7-10), to date they have lacked several important distinguishing characteristics of conventional Compton sources. We now report the experimental demonstration of all-laser-driven Compton X-rays that are both quasi-monoenergetic (similar to 50% full-width at half-maximum) and tunable (similar to 70 keV to >1 MeV). These performance improvements are highly beneficial for several important X-ray radiological applications(2,11-15).
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