Upon the interaction of 60 TW Ti: sapphire laser pulses with 4 mm long supersonic nitrogen gas jet, a directional x-ray emission was generated along with the generation of stable quasi-monoenergetic electron beams having a peak energy of 130 MeV and a relative energy spread of ∼ 20%. The betatron x-ray emission had a small divergence of 7.5 mrad and a critical energy of 4 keV. The laser wakefield acceleration process was stimulated in a background plasma density of merely 5.4 × 1017 cm−3 utilizing ionization injection. The non-self-focusing and stable propagation of the laser pulse in the pure nitrogen gaseous plasma should be responsible for the simultaneous generation of the high-quality X-ray and electron beams. Those ultra-short and naturally-synchronized beams could be applicable to ultrafast pump-probe experiments.
Simultaneous generation of quasi-monoenergetic electron and betatron X-rays from nitrogen gas via ionization injection
K. Huang, D. Z. Li, W. C. Yan, M. H. Li, M. Z. Tao, Z. Y. Chen, X. L. Ge, F. Liu, Y. Ma, J. R. Zhao, N. M. Hafz, J. Zhang, L. M. Chen; Simultaneous generation of quasi-monoenergetic electron and betatron X-rays from nitrogen gas via ionization injection. Appl. Phys. Lett. 17 November 2014; 105 (20): 204101. https://doi.org/10.1063/1.4902127
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