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

Abstract

Niobium superconducting rf cavities are proposed for use in the proton LINAC accelerators for spallation-neutron applications. The potential for accidental beam loss and continual halo losses along the accelerator path cause concern for the degradation of the superconducting properties of the cavities with the accumulating damage. Residual-resistivity-ratio (RRR) specimens of Nb, with a range of initial RRRs, were irradiated at room temperature with protons at energies from 200 to 2,000 MeV. Four-probe resistance measurements were made at room temperature and at 4.2K, 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. Irradiations to 2--3 x 10{sup 15}p/cm{sup 2} produce degradations up to the 10% level in materials that had a RRR = 316. Such a change is deemed operationally acceptable for an rf cavity. However, without periodic warming to room temperature, the accumulated damage energy would be up to a factor of greater than ten, resulting in unacceptable degradations. Likewise, the same damage energy imparted to higher RRR material would cause larger percentage changes in the RRR.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab., Upton, NY (US)
Sponsoring Org.:
USDOE
OSTI Identifier:
20020754
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 43; Journal Issue: 2-3; Other Information: PBD: Aug-Sep 1999; Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; 45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; NIOBIUM; SUPERCONDUCTING CAVITY RESONATORS; PHYSICAL RADIATION EFFECTS; LINEAR ACCELERATORS; SUPERCONDUCTIVITY; TRITIUM; ISOTOPE PRODUCTION

Citation Formats

Snead, C.L. Jr., Hanson, A., Greene, G.A., Ghosh, A., Czajkowski, C.J., Chan, K.C.D., Ward, T.E., and Safa, H. Resistivity changes in superconducting cavity-grade Nb following high-energy proton irradiation. United States: N. p., 1999. Web. doi:10.1016/S1044-5803(99)00037-6.
Snead, C.L. Jr., Hanson, A., Greene, G.A., Ghosh, A., Czajkowski, C.J., Chan, K.C.D., Ward, T.E., & Safa, H. Resistivity changes in superconducting cavity-grade Nb following high-energy proton irradiation. United States. doi:10.1016/S1044-5803(99)00037-6.
Snead, C.L. Jr., Hanson, A., Greene, G.A., Ghosh, A., Czajkowski, C.J., Chan, K.C.D., Ward, T.E., and Safa, H. Wed . "Resistivity changes in superconducting cavity-grade Nb following high-energy proton irradiation". United States. doi:10.1016/S1044-5803(99)00037-6.
@article{osti_20020754,
title = {Resistivity changes in superconducting cavity-grade Nb following high-energy proton irradiation},
author = {Snead, C.L. Jr. and Hanson, A. and Greene, G.A. and Ghosh, A. and Czajkowski, C.J. and Chan, K.C.D. and Ward, T.E. and Safa, H.},
abstractNote = {Niobium superconducting rf cavities are proposed for use in the proton LINAC accelerators for spallation-neutron applications. The potential for accidental beam loss and continual halo losses along the accelerator path cause concern for the degradation of the superconducting properties of the cavities with the accumulating damage. Residual-resistivity-ratio (RRR) specimens of Nb, with a range of initial RRRs, were irradiated at room temperature with protons at energies from 200 to 2,000 MeV. Four-probe resistance measurements were made at room temperature and at 4.2K, 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. Irradiations to 2--3 x 10{sup 15}p/cm{sup 2} produce degradations up to the 10% level in materials that had a RRR = 316. Such a change is deemed operationally acceptable for an rf cavity. However, without periodic warming to room temperature, the accumulated damage energy would be up to a factor of greater than ten, resulting in unacceptable degradations. Likewise, the same damage energy imparted to higher RRR material would cause larger percentage changes in the RRR.},
doi = {10.1016/S1044-5803(99)00037-6},
journal = {Materials Characterization},
issn = {1044-5803},
number = 2-3,
volume = 43,
place = {United States},
year = {1999},
month = {9}
}