Corresponding Author

Cheng Cheng

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China

Hefei Institutes of Physical Science, Chinese Academy of Sciences, Center of Medical Physics and Technology, Hefei, China

Anhui Province Key Laboratory of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China

Correspondence Shuheng Hu, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009 Anhui Province, China.

Email: shuheng.hu@163.com

Cheng Cheng, Institute of Plasma Physics, Chinese Academy of Sciences, 230031 Hefei, China.

Email: chengcheng@ipp.ac.cn

Paul K. Chu, Department of Physics and Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Ave., Kowloon, Hong Kong 999077, China.

Email: paul.chu@cityu.edu.hk

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