Hybrid capillary discharge waveguide for laser wakefield acceleration

Zhiyong Qin, Wentao Li, Jiansheng Liu, Jiaqi Liu, Changhai Yu, Wentao Wang, Rong Qi, Zhijun Zhang, Ming Fang, Ke Feng, Ying Wu, Lintong Ke, Yu Chen, Cheng Wang, Ruxin Li, Zhizhan Xu

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Abstract

A hybrid capillary discharge waveguide formed by injecting low-pressure hydrogen (< 3.8 Torr) into a pure ablative capillary is presented to supply the stable guiding for multi-GeV laser wakefield acceleration. The injected low-pressure gas only provides the seed plasma for ablative discharge breakdown, like the adsorbed gas in the inner wall of the ablative capillary. With this hybrid capillary, a stable discharge with low jitter (~ 5 ns) can be achieved in a simple way, and the plasma density inside can also be controlled in a range of ~0.7 x 1018cm-3-1.2 x 1018cm-3 within a 150-ns plasma channel temporal window. Furthermore, the hybrid capillary can also be easily extended to a longer length by adding multiple segments, and femtosecond laser pulses can be well guided both in the single and multiple segments mode. With these advantages, the hybrid capillary may provide an attractive plasma channel for multi-GeV-scale laser wakefield acceleration.
Original languageEnglish
Number of pages8
JournalPhysics of Plasmas
Volume25
Issue number7
DOIs
Publication statusPublished - 3 Jul 2018

Keywords

  • mode locking
  • laser plasma acceleration
  • plasma density
  • particle acceleration

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