Abstract
Cascaded laser wakefield acceleration (LWFA) of electrons is promising for producing monoenergetic electron beams well beyond 1 GeV by separating and controlling electron injection and postacceleration in two LWFA stages. We have demonstrated that electrons with Maxwellian spectra generated from the first LWFA assisted by tunnel-ionization-induced injection were seeded into the second LWFA and then accelerated to be a 0.8 GeV quasi-monoenergetic electron beam. Further acceleration toward multi-GeV may be fulfilled with a long plasma channel. Optical guiding of intense femtosecond laser pulses for powers up to 160 TW over a 4-cm long ablative capillary discharge plasma channel and laser wakefield acceleration of electrons well beyond 1 GeV were experimentally demonstrated. By employing an oxygen-containing ablative capillary, electron beams with energies extending up to 1.8 GeV were generated by using 130 TW, 55 fs laser pulses.
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Acknowledgements
This work was supported by the National 973 Program of China (Contract No: 2011CB808100), NNSF of China (Contract Nos: 10974214, 60921004 and 10834008), the State Key Laboratory Program of Chinese Ministry of Science and Technology, and the Knowledge Innovation Program of CAS. K. Nakajima is supported by CAS visiting professorship for senior international scientists.
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Liu, J. et al. (2012). Cascaded Laser Wakefield Acceleration Scheme for Monoenergetic High-Energy Electron Beam Generation. In: Yamanouchi, K., Nisoli, M., Hill, W. (eds) Progress in Ultrafast Intense Laser Science VIII. Springer Series in Chemical Physics, vol 103. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-28726-8_8
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DOI: https://doi.org/10.1007/978-3-642-28726-8_8
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