Actions for Study of the radiation damage of Nd-Fe-B permanent magnets [electronic resource].

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Study of the radiation damage of Nd-Fe-B permanent magnets [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2002.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
9 pages : digital, PDF file
Additional Creators
Argonne National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Nd-Fe-B permanent magnets are highly desirable for use in the insertion devices of synchrotron radiation sources due to their high remanence, or residual magnetic induction, and intrinsic coercivity. However, the radiation environment within high-energy electron storage rings necessitates the determination of the degree of radiation sensitivity as well as the mechanisms of radiation-induced demagnetization. A 0.5% change in the residual induction due to radiation damage cannot be tolerated in these devices. Sample Nd-Fe-B permanent magnets were irradiated at the Advanced Photon Source (APS) with bending magnet x-rays up to an absorbed dose of approximately 280 Mrad (1 Mrad = 10 kGy). Sample magnets were also irradiated with 60 Co γ-rays up to an absorbed dose of 700 Mrad at the National Institute of Standards and Technology's (NIST) standard gamma irradiation facility. Changes in the residual induction were found to be within the experimental uncertainties for both the x-ray and γ-ray irradiations. Sample Nd-Fe-B permanent magnets were then irradiated at Oak Ridge National Laboratory's (ORNL) Californium User Facility for Neutron Science with fast neutrons up to a total fast fluence of 1.61 x 10¹⁴ n/cm² and with thermal neutrons up to a total thermal fluence of 2.94 x 10¹² n/cm². The fast-neutron irradiation with a ²⁵²Cf spontaneous fission source revealed significant changes in residual induction of the sample magnets.
Report Numbers
E 1.99:anl/aod/cp-106006
anl/aod/cp-106006
Subject(s)
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Note
Published through SciTech Connect.
02/14/2002.
"anl/aod/cp-106006"
RPSD Topical Meeting, Santa Fe, NM (US), 04/14/2002--04/17/2002.
Martin, R.C.; Simmons, C.M.; Job, P.K.; Alderman, J.M.
Funding Information
W-31-109-ENG-38
View MARC record | catkey: 14689561