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Design criteria for a beam-driven resonant passive transverse deflector for longitudinal beam diagnostics

Dmitry Bazyl*, Winfried Decking, Sergey Tomin, and Igor Zagorodnov

  • *Contact author: dmitry.bazyl@desy.de
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Phys. Rev. Accel. Beams 29, 114002 – Published 5 November, 2026

DOI: https://doi.org/10.1103/g8fg-s5pd

Abstract

Conventional radio-frequency (rf) transverse deflecting structures provide high-resolution longitudinal beam diagnostics, but require externally generated high-power rf, waveguide distribution, synchronization, and input coupling at the operating frequency. We propose design criteria for a beam-driven resonant passive transverse deflector that does not require an external rf source. A leading drive bunch excites long-range wakefields in an off-axis periodic copper structure and a delayed witness bunch experiences the transverse wake near a zero crossing. The concept is based on the large temporal slope available from high-frequency wake components. A structure designed for installation after the second bunch compressor in the three-bunch-compressor layout of the European XFEL is optimized to place the zero crossing of the drive-bunch-induced transverse wake potential approximately one rf-bucket spacing of the 1.3  GHz linac behind the drive bunch. The selected geometry produces a multimode transverse kick dominated by TM-like modes. We use time-domain wake simulations, frequency-domain decomposition, cell-number scaling, mechanical-tolerance scans, orbit-offset studies, and uniform thermal scaling to determine the operating point and its sensitivity. For this geometry, the zero crossing occurs at s0≃230.6  mm, with a per-cell temporal slope of Scell=1.186  mV/(pC fs cell). For a compact 1  m structure operated with a 250  pC drive bunch and a 700  MeV witness beam, the estimated temporal resolution is about 33  fs.

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References (27)

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Phys. Rev. Accel. Beams 29, 114002– Published 5 November, 2026
  • Received 23 June 2026
  • Accepted 21 October 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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