Radiation Damage Studies of Materials and Electronic Devices Using Hadrons
Abstract
We have irradiated NdFeB permanent magnet samples from different manufacturers and with differing values of coercivity and remanence using stepped doses of 1 MeV equivalent neutrons up to a fluence of 0:64 1015n=cm2 to evaluate effects on magnetization and B field distributions. The samples with high coercivity, irradiated in open circuit configurations, showed no or minimal effects when compared with unirradiated samples, whereas the lower coercivity magnets suffered significant losses of magnetization and changes in the shapes of their field patterns. One such magnet underwent a fractional magnetization loss of 13.1% after a fluence of 0:59 1015 n=cm2. This demagnetization was not uniform. With increasing fluence, B field scans along the centerlines of the pole faces revealed that the normal component of B decreased more near the midpoint of the scan than near the ends. In addition, a fit to the curve of overall magnetization loss with fluence showed a significant deviation from linearity. The results are discussed in light of other measurements and theory. The high coercivity materials appear suitable for use in accelerator applications subject to irradiation by fast neutrons such as dipoles where the internal demagnetizing field is comparable to or less than that of the openmore »
- Authors:
- Publication Date:
- Research Org.:
- The Regents of the University of California, Davis
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Department of Physics, University of California, Davis
- OSTI Identifier:
- 1132076
- Report Number(s):
- DOE-DAVIS-ER41280
- DOE Contract Number:
- FG02-03ER41280
- Resource Type:
- Technical Report
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Pellett, David, Baldwin, Andrew, Gallagher, Garratt, Olson, David, and Styczinski, Marshall. Radiation Damage Studies of Materials and Electronic Devices Using Hadrons. United States: N. p., 2014.
Web. doi:10.2172/1132076.
Pellett, David, Baldwin, Andrew, Gallagher, Garratt, Olson, David, & Styczinski, Marshall. Radiation Damage Studies of Materials and Electronic Devices Using Hadrons. United States. https://doi.org/10.2172/1132076
Pellett, David, Baldwin, Andrew, Gallagher, Garratt, Olson, David, and Styczinski, Marshall. 2014.
"Radiation Damage Studies of Materials and Electronic Devices Using Hadrons". United States. https://doi.org/10.2172/1132076. https://www.osti.gov/servlets/purl/1132076.
@article{osti_1132076,
title = {Radiation Damage Studies of Materials and Electronic Devices Using Hadrons},
author = {Pellett, David and Baldwin, Andrew and Gallagher, Garratt and Olson, David and Styczinski, Marshall},
abstractNote = {We have irradiated NdFeB permanent magnet samples from different manufacturers and with differing values of coercivity and remanence using stepped doses of 1 MeV equivalent neutrons up to a fluence of 0:64 1015n=cm2 to evaluate effects on magnetization and B field distributions. The samples with high coercivity, irradiated in open circuit configurations, showed no or minimal effects when compared with unirradiated samples, whereas the lower coercivity magnets suffered significant losses of magnetization and changes in the shapes of their field patterns. One such magnet underwent a fractional magnetization loss of 13.1% after a fluence of 0:59 1015 n=cm2. This demagnetization was not uniform. With increasing fluence, B field scans along the centerlines of the pole faces revealed that the normal component of B decreased more near the midpoint of the scan than near the ends. In addition, a fit to the curve of overall magnetization loss with fluence showed a significant deviation from linearity. The results are discussed in light of other measurements and theory. The high coercivity materials appear suitable for use in accelerator applications subject to irradiation by fast neutrons such as dipoles where the internal demagnetizing field is comparable to or less than that of the open circuit samples tested in this study.},
doi = {10.2172/1132076},
url = {https://www.osti.gov/biblio/1132076},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed May 14 00:00:00 EDT 2014},
month = {Wed May 14 00:00:00 EDT 2014}
}