Bright x-ray radiation from plasma bubbles in an evolving laser wakefield accelerator
oleh: M. S. Bloom, M. J. V. Streeter, S. Kneip, R. A. Bendoyro, O. Cheklov, J. M. Cole, A. Döpp, C. J. Hooker, J. Holloway, J. Jiang, N. C. Lopes, H. Nakamura, P. A. Norreys, P. P. Rajeev, D. R. Symes, J. Schreiber, J. C. Wood, M. Wing, Z. Najmudin, S. P. D. Mangles
| Format: | Article |
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| Diterbitkan: | American Physical Society 2020-06-01 |
Deskripsi
We show that the properties of the electron beam and bright x rays produced by a laser wakefield accelerator can be predicted if the distance over which the laser self-focuses and compresses prior to self-injection is taken into account. A model based on oscillations of the beam inside a plasma bubble shows that performance is optimized when the plasma length is matched to the laser depletion length. With a 200 TW laser pulse, this results in an x-ray beam with a median photon energy of 20 keV, >6×10^{8} photons above 1 keV per shot, and a peak brightness of 3×10^{22} photons s^{-1} mrad^{-2} mm^{-2} (0.1% BW)^{−1}.