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Cryogenic permanent magnet undulator by evaporative cooling of liquid nitrogen

Jui-Che Huang1,*, Hideo Kitamura2, Ping-Shun Chuang1,†, Hsing-Chieh Li1, Chih-Sheng Yang1, Chun-Yi Wu1, Chih-Yu Liao1, Huang-Hsiu Tsai1, Chih-Wei Chen1 et al.

Wun-Rong Liao1 and Chin-Kang Yang1

  • *Contact author: huang.juiche@nsrrc.org.tw
  • †Contact author: chuang.phd@nsrrc.org.tw
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Phys. Rev. Accel. Beams 28, 093501 – Published 5 September, 2025

DOI: https://doi.org/10.1103/ysbx-qqsc

Abstract

CUT18, a cryogenic permanent magnet undulator at the Taiwan Photon Source, represents a significant advancement in undulator technology, offering enhanced flexibility, sustainability, and reliability. It uses a cooling method based on the latent heat of vaporization of liquid nitrogen (LN2), utilizing the facility’s existing LN2 supply line to improve resource efficiency and reduce operational costs. The LN2 evaporative cooling system delivers exceptional thermal management, with cooling margins far exceeding the heat load at a beam current of 500 mA, ensuring stable operation even under high beam-induced heating conditions. In addition to this, the adoption of advanced NdFeB magnets, optimized with a 17° magnetization tilt, significantly enhances magnetic field performance and achieves a high deflection parameter (K>2).

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References (11)

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Phys. Rev. Accel. Beams 28, 093501– Published 5 September, 2025
  • Received 15 March 2025
  • Accepted 23 July 2025
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