Transverse phase space diagnostics for ionization injection in laser plasma acceleration using permanent magnetic quadrupoles
Published in Plasma Physics and Controlled Fusion, 2018
Abstract: We report the transverse phase space diagnostics for electron beams generated through ionization injection in a laser-plasma accelerator. Single-shot measurements of both ultimate emittance and Twiss parameters are achieved by means of permanent magnetic quadrupole. Beams with emittance of μm rad level are obtained in a typical ionization injection scheme, and the dependence on nitrogen concentration and charge density is studied experimentally and confirmed by simulations. A key feature of the transverse phase space, matched beams with Twiss parameter αT≃ 0, is identified according to the measurement. Numerical simulations that are in qualitative agreement with the experimental results reveal that a sufficient phase mixing induced by an overlong injection length leads to the matched phase space distribution.
Recommended citation: Fei Li, Zan Nie, Yipeng Wu, Bo Guo, Xiaohui Zhang, Shan Huang, Jie Zhang, Zhi Cheng, Yue Ma, Yu Fang, Chaojie Zhang, Yang Wan, Xinlu Xu, Jianfei Hua, Chi-Hao Pai, Wei Lu, Warren B. Mori, "Transverse phase space diagnostics for ionization injection in laser plasma acceleration using permanent magnetic quadrupoles," Plasma Phys. Control. Fusion 60, 054008 (2018).
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