Tunable Plasma Linearizer for Compensation of Nonlinear Energy Chirp

Yipeng Wu, Jianfei Hua, Zheng Zhou, Jie Zhang, Shuang Liu, Bo Peng, Yu Fang, Xiaonan Ning, Zan Nie, Qili Tian, Chih-Hao Pai, Yingchao Du, Wei Lu, Warren B. Mori, and Chan Joshi
Phys. Rev. Applied 16, 024056 – Published 30 August 2021
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Abstract

The removal of undesired nonlinear time-energy correlation (energy chirp) present in relativistic electron beams is crucial for many accelerator-based scientific applications, such as free-electron lasers, high-energy electron radiography, and MeV ultrafast electron microscopy. Here, we propose and demonstrate that a low-density plasma section can be used as a passive “linearizer” to significantly compensate for the nonlinear energy chirp imprinted on a beam by the curvature of the radio-frequency field in a conventional accelerator. Physically, the passage of the beam through the plasma excites a strong quasi-cosinoidal longitudinal decelerating wakefield that acts to mitigate the beam’s nonlinear energy chirp by superimposing a reverse chirp on the beam. Time-resolved phase-space measurements, combined with high-fidelity three-dimensional particle-in-cell simulations show that the longitudinal phase space of the beam core is almost completely linearized, leading to a fourfold reduction of the beam overall energy spread from 0.148% to 0.036% (FWHM).

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  • Received 23 May 2021
  • Revised 29 June 2021
  • Accepted 14 July 2021

DOI:https://doi.org/10.1103/PhysRevApplied.16.024056

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Accelerators & BeamsPlasma Physics

Authors & Affiliations

Yipeng Wu1,2, Jianfei Hua1,*, Zheng Zhou1,†, Jie Zhang1, Shuang Liu1, Bo Peng1, Yu Fang1, Xiaonan Ning1, Zan Nie1,2, Qili Tian1, Chih-Hao Pai1, Yingchao Du1, Wei Lu1,‡, Warren B. Mori2, and Chan Joshi2

  • 1Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  • 2University of California, Los Angeles, California 90095, USA

  • *jfhua@tsinghua.edu.cn
  • z-zhou14@tsinghua.org.cn
  • weilu@tsinghua.edu.cn

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Vol. 16, Iss. 2 — August 2021

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