Enhancing the Radiation Resistance of Undulator Permanent Magnets by Tilting the Easy Axis of Magnetization

Teruhiko Bizen, Ryota Kinjo, and Takashi Tanaka
Phys. Rev. Lett. 121, 124801 – Published 17 September 2018

Abstract

The undulator is a magnetic device usually consisting of a series of rare-earth permanent magnets (REPMs) arranged to generate a sinusoidal magnetic field, and is installed in synchrotron radiation and free electron laser facilities to periodically deflect high-energy electrons. Because the undulator is operated under a high-radiation environment, it is important to take possible measures to avoid the quality degradation, in particular the radiation damage of REPMs. We present a simple scheme to enhance the radiation resistance of REPMs in undulators, in which the easy axis of each REPM is tilted by 45°. Experimental studies have revealed that the radiation resistance of REPMs in this configuration is enhanced by an order of magnitude compared to that in the conventional undulator.

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  • Received 7 June 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.124801

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

Teruhiko Bizen1, Ryota Kinjo2, and Takashi Tanaka2,*

  • 1Japan Synchrotron Radiation Research Institute, Koto 1-1-1, Sayo, Hyogo 679-5198, Japan
  • 2RIKEN SPring-8 Center, Koto 1-1-1, Sayo, Hyogo 679-5148, Japan

  • *ztanaka@spring8.or.jp

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Issue

Vol. 121, Iss. 12 — 21 September 2018

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