Irradiation of Nd-Fe-B permanent magnets with APS bending magnet x-rays and {sup 60}Co {gamma}-rays

Alderman, J. ; Job, P. K. ; Puhl, J.

Argonne National Laboratory

关键词: Advanced Photon Source;    Demagnetization;    Bremsstrahlung;    Light Sources;    Irradiation;   

DOI  :  10.2172/764212
RP-ID  :  LS-288
RP-ID  :  W-31109-ENG-38
RP-ID  :  764212

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Advanced Photon Source (APS), as well as other third-generation synchrotron light sources, uses permanent magnets in the insertion devices to produce x-rays for scientific research. When placed in a high-energy storage ring, these permanent magnets are subjected to irradiation from synchrotron radiation, high-energy bremsstrahlung, and bremsstrahlung-produced photoneutrons. Previous investigations have exhibited varying degrees of degradation in the intensity of magnetization of these magnets due to irradiation from electron beams, {sup 60}Co {gamma}rays, and high-energy neutrons. The APS specifically uses Nd-Fe-B permanent magnets in their insertion devices. Although no detectable radiation-induced demagnetization has been observed in the APS insertion devices so far, partial demagnetization has been observed in at least one insertion device at the European Synchrotron Radiation Facility (ESRF), where Nd-Fe-B permanent magnets are also used.