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  • Letter
  • Open Access

Breakthrough in field amplitude of high-temperature superconductors staggered-array undulators

Ryota Kinjo* and Satoshi Sato

Marco Calvi

  • *Contact author: ryota.kinjo@oit.ac.jp
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Phys. Rev. Research 7, L042018 – Published 17 October, 2025

DOI: https://doi.org/10.1103/1f8q-lbfj

Abstract

The fundamental wavelength of undulator radiation and free-electron lasers depends on the period and magnetic field strength of the undulator. Shortening the undulator period and increasing the magnetic field strength are essential for achieving higher-energy radiation and increased flux. The most promising approach to date has been an undulator utilizing high-temperature superconductors (HTSs), particularly the bulk HTS staggered-array undulator (BHSAU). In this Letter, we demonstrated that adding a ring HTS can increase the magnetic field strength of the BHSAU to two to three times. It was found that the ring HTS not only provides an additional undulator magnetic field but also shields the solenoid magnetic field, allowing for stronger solenoid field variations without affecting the electron beam. This, in turn, enhances the magnetic field generated by the bulk HTS itself, resulting in an exceptionally strong undulator field. The magnetic field of the undulator is more than ten times stronger than that of in-vacuum permanent magnet-based structures of similar design, significantly enhancing the performance of synchrotron radiation and free-electron lasers.

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Phys. Rev. Research 7, L042018– Published 17 October, 2025
  • Received 16 December 2024
  • Accepted 11 May 2025
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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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