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Title: Optical circular deflector with attosecond resolution for ultrashort electron beam

Abstract

A novel method using high-power laser as a circular deflector is proposed for the measurement of femtosecond (fs) and sub-fs electron beam. In the scheme, the electron beam interacts with a laser pulse operating in a radially polarized doughnut mode ( TEM 01 * ) in a helical undulator, generating angular kicks along the beam in two directions at the same time. The phase difference between the two angular kicks makes the beam form a ring after a propagation section with appropriate phase advance, which can reveal the current profile of the electron beam. Detailed theoretical analysis of the method and numerical results with reasonable parameters are both presented. Lastly, it is shown that the temporal resolution can reach up to ~ 100 attosecond, which is a significant improvement for the diagnostics of ultrashort electron beam.

Authors:
 [1];  [1];  [1];  [2];  [2]
  1. Tsinghua Univ., Beijing (China). Dept. of Engineering Physics
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE; National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1358641
Report Number(s):
SLAC-PUB-16931
Journal ID: ISSN 2469-9888; PRABCJ; TRN: US1702659
Grant/Contract Number:
11375097; 11435015; AC02-76SF00515
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 20; Journal Issue: 5; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Beam diagnostics; free-electron lasers (FELs)

Citation Formats

Zhang, Zhen, Du, Yingchao, Tang, Chuanxiang, Ding, Yuantao, and Huang, Zhirong. Optical circular deflector with attosecond resolution for ultrashort electron beam. United States: N. p., 2017. Web. doi:10.1103/PhysRevAccelBeams.20.050702.
Zhang, Zhen, Du, Yingchao, Tang, Chuanxiang, Ding, Yuantao, & Huang, Zhirong. Optical circular deflector with attosecond resolution for ultrashort electron beam. United States. doi:10.1103/PhysRevAccelBeams.20.050702.
Zhang, Zhen, Du, Yingchao, Tang, Chuanxiang, Ding, Yuantao, and Huang, Zhirong. 2017. "Optical circular deflector with attosecond resolution for ultrashort electron beam". United States. doi:10.1103/PhysRevAccelBeams.20.050702.
@article{osti_1358641,
title = {Optical circular deflector with attosecond resolution for ultrashort electron beam},
author = {Zhang, Zhen and Du, Yingchao and Tang, Chuanxiang and Ding, Yuantao and Huang, Zhirong},
abstractNote = {A novel method using high-power laser as a circular deflector is proposed for the measurement of femtosecond (fs) and sub-fs electron beam. In the scheme, the electron beam interacts with a laser pulse operating in a radially polarized doughnut mode ( TEM01 * ) in a helical undulator, generating angular kicks along the beam in two directions at the same time. The phase difference between the two angular kicks makes the beam form a ring after a propagation section with appropriate phase advance, which can reveal the current profile of the electron beam. Detailed theoretical analysis of the method and numerical results with reasonable parameters are both presented. Lastly, it is shown that the temporal resolution can reach up to ~ 100 attosecond, which is a significant improvement for the diagnostics of ultrashort electron beam.},
doi = {10.1103/PhysRevAccelBeams.20.050702},
journal = {Physical Review Accelerators and Beams},
number = 5,
volume = 20,
place = {United States},
year = 2017,
month = 5
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevAccelBeams.20.050702

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  • A novel method using high-power laser as a circular deflector is proposed for the measurement of femtosecond (fs) and sub-fs electron beam. In the scheme, the electron beam interacts with a laser pulse operating in a radially polarized doughnut mode ( TEM 01 * ) in a helical undulator, generating angular kicks along the beam in two directions at the same time. The phase difference between the two angular kicks makes the beam form a ring after a propagation section with appropriate phase advance, which can reveal the current profile of the electron beam. Detailed theoretical analysis of the methodmore » and numerical results with reasonable parameters are both presented. Lastly, it is shown that the temporal resolution can reach up to ~ 100 attosecond, which is a significant improvement for the diagnostics of ultrashort electron beam.« less
  • The temporal compression of photoelectron pulses obtained by irradiation of the target by femtosecond electron pulses is analysed by using an electrostatic reflectron with a deflecting pulse laser field. It is shown that the use of a reflectron-deflector allows one both to generate and deflect ultrashort, ∼30-fs electron pulses with a countable number of electrons by focusing them into a given region with a focal size about tens of microns. It is found that the laser ponderomotive potential can play a role of a dispersive element in the electrostatic reflectron to spatially separate the electron pulses with different energies. (ultrashortmore » electron pulses)« less
  • For controllable generation of an isolated attosecond relativistic electron bunch [relativistic electron mirror (REM)] with nearly solid-state density, we propose using a solid nanofilm illuminated normally by an ultraintense femtosecond laser pulse having a sharp rising edge. With two-dimensional (2D) particle-in-cell (PIC) simulations, we show that, in spite of Coulomb forces, all of the electrons in the laser spot can be accelerated synchronously, and the REM keeps its surface charge density during evolution. We also developed a self-consistent 1D theory, which takes into account Coulomb forces, radiation of the electrons, and laser amplitude depletion. This theory allows us to predictmore » the REM parameters and shows a good agreement with the 2D PIC simulations.« less
  • A hemispherical deflector analyzer usually consists of an electrostatic input lens, two concentric hemispherical deflector plates and a channel electron multiplier. Input lens system is used to focus electron beam at the entrance of the hemispherical deflector which disperses the beam according to their energy, and a channel electron multiplier is used to detect electrons. In the present work, we investigated the energy resolution of hemispherical electron energy analyzers as a function electron energy, entrance angle of the beam, and analyzer radius both using ray-tracing and analytical method. Distributions of electrons at the exit of the analyzer were calculated formore » the total maximum angular divergences of 10 - 50. We expect this general approach to be of particular interest to investigators using modern HDAs.« less