Time-of-flight jitter reduction based on an energy spectrometer for ultrafast electron diffraction

Yan Shen; Kuanjun Fan; Jian Wang; Xiaofei Li; Jinfeng Yang

doi:10.1117/12.2605586

9 September 2021 Time-of-flight jitter reduction based on an energy spectrometer for ultrafast electron diffraction

Yan Shen, Kuanjun Fan, Jian Wang, Xiaofei Li, Jinfeng Yang

Proceedings Volume 11909, Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021); 119090T (2021) https://doi.org/10.1117/12.2605586
Event: Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021), 2021, Chengdu, China

Abstract

An Ultrafast Electron Diffraction (UED) based on an RF photocathode electron gun has the advantage of producing MeV relativistic probing electron beams, which can maintain a high time resolution of ~100 fs while keeping more electrons to improve the S/R ratio of the image. However, the jitter of driving RF power in the electron gun between pulse to pulse has an indispensable impact on the electron energy stability leading to the Time of Flight (ToF) jitter, which creates asynchronization between the pump laser and the probing electron worsening the time resolution. To stabilize the beam energy to the designed value 3 MeV and reduce the ToF jitter further, we propose controlling the electron energy based on an energy spectrometer directly. An electron spectrometer based on a C-type dipole is being designed to achieve high energy resolution. This paper will introduce the design of the energy spectrometer, and particle tracking is implemented to demonstrate the feasibility of the design.

Citation Download Citation

Yan Shen, Kuanjun Fan, Jian Wang, Xiaofei Li, and Jinfeng Yang "Time-of-flight jitter reduction based on an energy spectrometer for ultrafast electron diffraction", Proc. SPIE 11909, Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021), 119090T (9 September 2021); https://doi.org/10.1117/12.2605586

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