7 May 2013 Fabrication of three-dimensionally structured plasma waveguide and application to induction of electron injection and betatron oscillation in a laser wakefield electron accelerator
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Abstract
By adding a transverse heater pulse with controlled intensity distribution into the axicon ignitor-heater scheme for optically producing a plasma waveguide, three-dimensionally structured plasma waveguide can be fabricated. The additional heater pulse generates further heating of the plasma filament produced by the axicon pulses in a spatially and temporally controlled manner. The succeeding evolution of the plasma leads to a properly structured plasma waveguide that suits for targeted application. With this technique, induction of electron injection in a plasma-waveguide-based laser wakefield accelerator was achieved and resulted in production of a quasi-monoenergetic electron beam with an electron energy reaching 280 MeV and an energy spread as low as 1% in a 4-mm-long gas jet by properly setting the transverse heater pulse delay with respect to the axicon pulses. Furthermore, strong hard X-ray beam was observed upon further increase of transverse heater delay so that the irradiated section in the plasma waveguide acts as a plasma kicker to enhance betatron oscillation.
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Y.-C. Ho, Y.-C. Ho, T.-S. Hung, T.-S. Hung, J.-G. Jhou, J.-G. Jhou, H. Qayyum, H. Qayyum, W.-H. Chen, W.-H. Chen, H.-H. Chu, H.-H. Chu, J.-Y. Lin, J.-Y. Lin, J. Wang, J. Wang, S.-Y. Chen, S.-Y. Chen, } "Fabrication of three-dimensionally structured plasma waveguide and application to induction of electron injection and betatron oscillation in a laser wakefield electron accelerator", Proc. SPIE 8779, Laser Acceleration of Electrons, Protons, and Ions II; and Medical Applications of Laser-Generated Beams of Particles II; and Harnessing Relativistic Plasma Waves III, 877906 (7 May 2013); doi: 10.1117/12.2017195; https://doi.org/10.1117/12.2017195
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