Journal
NATURE PHOTONICS
Volume 6, Issue 5, Pages 308-311Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2012.82
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Funding
- European Research Council through the PARIS ERC [226424]
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One of the major goals of research for laser-plasma accelerators(1) is the realization of compact sources of femtosecond X-rays(2-4). In particular, using the modest electron energies obtained with existing laser systems, Compton scattering a photon beam off a relativistic electron bunch has been proposed as a source of high-energy and high-brightness photons. However, laser-plasma based approaches to Compton scattering have not, to date, produced X-rays above 1 keV. Here, we present a simple and compact scheme for a Compton source based on the combination of a laser-plasma accelerator and a plasma mirror. This approach is used to produce a broadband spectrum of X-rays extending up to hundreds of keV and with a 10,000-fold increase in brightness over Compton X-ray sources based on conventional accelerators(5,6). We anticipate that this technique will lead to compact, high-repetition-rate sources of ultrafast (femtosecond), tunable (X-through gamma-ray) and low-divergence (similar to 1 degrees) photons from source sizes on the order of a micrometre.
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