Optimization of gas-filled quartz capillary discharge waveguide for high-energy 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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A hydrogen-filled capillary discharge waveguide made of quartz is presented for high-energy laser wakefield acceleration (LWFA). The experimental parameters (discharge current and gas pressure) were optimized to mitigate ablation by a quantitative analysis of the ablation plasma density inside the hydrogen-filled quartz capillary. The ablation plasma density was obtained by combining a spectroscopic measurement method with a calibrated gas transducer. In order to obtain a controllable plasma density and mitigate the ablation as much as possible, the range of suitable parameters was investigated. The experimental results demonstrated that the ablation in the quartz capillary could be mitigated by increasing the gas pressure to similar to 7.5-14.7 Torr and decreasing the discharge current to similar to 70-100 A. These optimized parameters are promising for future high-energy LWFA experiments based on the quartz capillary discharge waveguide.
Original languageEnglish
Article number043117
Number of pages8
JournalPhysics of Plasmas
Issue number4
Publication statusPublished - 25 Apr 2018


  • high-energy laser wakefield acceleration
  • LWFA
  • plasma density
  • hydrogen-filled quartz capillary


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