Abstract
We have developed a new approach to characterize betatron X-ray radiation that is excited by the wiggling of relativistic electrons inside laser wakefield driven cavities. This approach can measure the average critical energy, E c , of the betatron radiation by using the reflection off a grazing incidence mirror (ROGIM). This technique relies on the reflectivity change of a high-Z-coated mirror with the grazing angle of incidence for the betatron X-rays. The average E c measured with this approach is in agreement with the one measured with a photon-counting X-ray CCD. This approach suggests that grazing incidence mirrors coupled to X-ray detectors can be used as online monitors of E c in betatron applications.
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Contribution to the Topical Issue “X-ray Generation from Ultrafast Lasers”, edited by Germán J. de Valcárcel, Luis Roso and Amelle Zaïr
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Mo, M., Fourmaux, S., Ali, A. et al. Characterization of laser wakefield generated betatron X-ray radiation using grazing incidence mirror reflection. Eur. Phys. J. D 68, 301 (2014). https://doi.org/10.1140/epjd/e2014-50346-5
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DOI: https://doi.org/10.1140/epjd/e2014-50346-5