Resistivity changes in superconducting-cavity-grade Nb following high-energy proton irradiation

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Niobium superconducting rf cavities are proposed for use in the proton LINAC accelerators for spallation-neutron applications. Because of accidental beam loss and continual halo losses along the accelerator path, concern for the degradation of the superconducting properties of the cavities with accumulating damage arises. Residual-resistivity-ratio (RRR) specimens of Nb, with a range of initial RRR`s were irradiated at room temperature with protons at energies from 200 to 2000 MeV. Four-probe resistance measurements were made at room temperature and at 4.2 K both prior to and after irradiation. Nonlinear increases in resistivity simulate expected behavior in cavity material after extended irradiation, ... continued below

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7 p.

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Snead, C.L. Jr.; Hanson, A. & Greene, G.A. December 1, 1997.

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Description

Niobium superconducting rf cavities are proposed for use in the proton LINAC accelerators for spallation-neutron applications. Because of accidental beam loss and continual halo losses along the accelerator path, concern for the degradation of the superconducting properties of the cavities with accumulating damage arises. Residual-resistivity-ratio (RRR) specimens of Nb, with a range of initial RRR`s were irradiated at room temperature with protons at energies from 200 to 2000 MeV. Four-probe resistance measurements were made at room temperature and at 4.2 K both prior to and after irradiation. Nonlinear increases in resistivity simulate expected behavior in cavity material after extended irradiation, followed by periodic anneals to room temperature: For RRR = 316 material, irradiations to (2 - 3) x 10{sup 15} p/cm{sup 2} produce degradations up to the 10% level, a change that is deemed operationally acceptable. Without. periodic warming to room temperature, the accumulated damage energy would be up to a factor of ten greater, resulting in unacceptable degradations. Likewise, should higher-RRR material be used, for the same damage energy imparted, relatively larger percentage changes in the RRR will result.

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7 p.

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INIS; OSTI as DE98001631

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  • 126. annual meeting of the Minerals, Metals and Materials Society, Orlando, FL (United States), 9-13 Feb 1997

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  • Other: DE98001631
  • Report No.: BNL--64951
  • Report No.: CONF-970201--
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 562489
  • Archival Resource Key: ark:/67531/metadc691942

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 25, 2015, 12:47 p.m.

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Snead, C.L. Jr.; Hanson, A. & Greene, G.A. Resistivity changes in superconducting-cavity-grade Nb following high-energy proton irradiation, article, December 1, 1997; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc691942/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.