An Experimental Study of Radiation-Induced Demagnetization of Insertion Device Permanent Magnets

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High brilliance in the 3GeV new light source NSLS II is obtained from the high magnetic fields in insertion devices (ID). The beam lifetime is limited to 3h by single Coulomb scattering in the Bunch (Touschek effect). This effect occurs everywhere around the circumference and there is unavoidable beam loss in the adjacent low aperture insertion devices. This raises the issue of degradation and damage of the permanent magnetic material by irradiation with high energy electrons and corresponding shower particles. It is expected that IDs, especially those in-vacuum, would experience changes resulting from exposure to gamma rays, x-rays, electrons and ... continued below

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Simos,N.; Job, P.K. & Mokhov, N. June 23, 2008.

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High brilliance in the 3GeV new light source NSLS II is obtained from the high magnetic fields in insertion devices (ID). The beam lifetime is limited to 3h by single Coulomb scattering in the Bunch (Touschek effect). This effect occurs everywhere around the circumference and there is unavoidable beam loss in the adjacent low aperture insertion devices. This raises the issue of degradation and damage of the permanent magnetic material by irradiation with high energy electrons and corresponding shower particles. It is expected that IDs, especially those in-vacuum, would experience changes resulting from exposure to gamma rays, x-rays, electrons and neutrons. By expanding an on-going material radiation damage study at BNL the demagnetization effect of irradiation consisting primarily of neutrons, gamma rays and electrons on a set of NdFeB magnets is studied. Integrated doses ranging from several Mrad to a few Grad were achieved at the BNL Isotope Facility with a 112 MeV, 90 {micro}A proton beam. Detailed information on dose distributions as well as on particle energy spectra on the NdFeB magnets was obtained in realistic simulations with the MARS15 Monte-Carlo code. This paper summarizes the results of this study.

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  • 11th Biennial European Particle Accelerator Conference; Genoa, Italy; 20080623 through 20080627

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  • Report No.: BNL--81453-2008-CP
  • Grant Number: DE-AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 939172
  • Archival Resource Key: ark:/67531/metadc894391

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  • June 23, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 1, 2016, 2:31 p.m.

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Simos,N.; Job, P.K. & Mokhov, N. An Experimental Study of Radiation-Induced Demagnetization of Insertion Device Permanent Magnets, article, June 23, 2008; United States. (digital.library.unt.edu/ark:/67531/metadc894391/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.