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In-vacuum thin eddy-current septum magnet for innovative off-axis beam injection in next-generation light source

Shiro Takano1,2,*, Kenji Fukami1,2, Takahiro Inagaki2,1, Taiki Iwashita3,4, Chikara Kondo1,2, Mitsuhiro Masaki1, Kanichiro Ogata5, Masaya Oishi1,2, Yoshiyuki Saito5 et al.

Masazumi Shoji1,2, Minori Tajima1, Kazuhiro Tamura1,2, Tsutomu Taniuchi1, Takahiro Watanabe1,2, Hiroshi Yamaguchi1, and Hitoshi Tanaka2

  • *Contact author: takano@spring8.or.jp
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Phys. Rev. Accel. Beams 28, 092401 – Published 10 September, 2025

DOI: https://doi.org/10.1103/rvbw-ml5n

Abstract

Beam injection is one of the most crucial issues for next-generation light sources such as diffraction-limited storage rings. We propose a novel transparent off-axis beam injection scheme for low-emittance storage rings of future light sources. The scheme aims to achieve efficient beam injection into a narrow dynamic aperture with small injection amplitude, while minimizing perturbation to the stored beam with transparent beam injection. An in-vacuum thin eddy-current septum magnet is one of the key components of the scheme to achieve the small injection amplitude. A prototype of the magnet with an accommodating ultrahigh vacuum (UHV) chamber was designed and fabricated. Magnet performance of the prototype demonstrated that an injection amplitude as small as 3 mm is feasible, fulfilling the tight constraint of injection amplitude in off-axis beam injection for next-generation light sources. The prototype achieved a UHV pressure of better than 1×10−7  Pa, ensuring the vacuum performance required for stable operation in storage rings.

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Phys. Rev. Accel. Beams 28, 092401– Published 10 September, 2025
  • Received 6 March 2025
  • Accepted 18 August 2025
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