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The expertise of ANL and FNAL has led to the production of Nb3Sn undulator magnets for the ANL Advanced Photon Source (APS). These magnets showed performance reproducibility ~100% of the short sample limit, and a design field increase of 20% at 820A. However, the long training did not allow obtaining the expected 50% increase of the on-axis magnetic field with respect to the 1.1 T produced at 450 A current in the ANL NbTi undulator. To address this, 10-pole long prototypes were fabricated, and CTD-101K® was replaced as impregnation material with TELENE®, an organic olefin-based thermosetting dicyclopentadiene resin produced by RIMTEC Corporation, Japan. Training and magnet retraining after a thermal cycle were nearly eliminated, with only a couple of quenches needed before reaching short sample limit at over 1,100 A. TELENE will enable operation of Nb3Sn undulators much closer to their short sample limit, expanding the energy range and brightness intensity of light sources. TELENE is Co-60 gamma radiation resistant up to 7-8 MGy, and therefore already applicable to impregnate planar, helical and universal devices operating in lower radiation environments than high energy colliders.

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  © 2025 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Keyword: Dicyclopentadiene, light source, impregnation, superconducting undulator, training

Date published: 2025-03-19

Publisher: Institute of Electrical and Electronics Engineers (IEEE)

Journal:

• IEEE Transactions on Applied Superconductivity (ISSN: 10518223) vol. 35 issue. 5 p. 1-5

Funding:

• Fermi Research Alliance, LLC DE-AC02-07CH11359

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5591

First published URL: https://doi.org/10.1109/tasc.2025.3540817

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Updated at: 2025-07-16 12:30:25 +0900

Published on MDR: 2025-07-16 12:18:01 +0900