Faraday-rotation self-interference method for electron beam duration measurement in the laser wakefield accelerator

Jiaqi Liu, Wentao Li, Jiansheng Liu, Zhiyong Qin, Wentao Wang, Rong Qi, Zhijun Zhang, Changhai Yu, Ming Fang, Cheng Wang, Ruxin Li

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Real-time single-shot measurement of the femtosecond electron beam duration in laser wakefield accelerators is discussed for both experimental design and theoretical analysis that combines polarimetry and interferometry. The probe pulse polarization is rotated by the azimuthal magnetic field of the electron beam and then introduced into a Michelson-type interferometer for self-interference. The electron beam duration is obtained from the region size of the interference fringes, which is independent of the pulse width of the probe laser. Using a larger magnification system or incident angle, the measurement resolution can be less than 1 fs.
Original languageEnglish
Number of pages11
JournalChinese Optics Letters
Issue number7
Publication statusPublished - 10 Jul 2018



  • Faraday rotation
  • laser wakefield accelerator
  • electron beam

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