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Title: Determination of the damage-energy cross section of 14-MeV neutrons from critical-property changes in irradiated Nb/sub 3/Sn

Abstract

Short samples of single-core and 19-core multifilament wires in bronze jackets have been irradiated with 14-MeV neutrons to a total fluence of 2 x 10/sup 18/ n/cm/sup 2/ using the Livermore Rotating Target Neutron source. At fluences of 1 and 2 x 10/sup 18/ n/cm/sup 2/ the critical temperature was measured, and also the critical current as a function of applied transverse magnetic field up to 175 kG to ascertain the radiation-induced changes in these properties. Measurements as a function of fluence of identical samples following reactor-neutron irradiation established the baseline for comparison of the 14-MeV results. By comparing the changes observed and relating them to the spectrum-averaged damage-energy cross section for the HFBR neutrons, a value for the damage-energy cross section for 14-MeV neutrons has been deduced of 313/sup +50//sub -80/ bkeV. Comparison of the critical current vs applied field for the two types of irradiation indicates that the flux-pinning characteristics are different for equal damage energies. This can be explained by a larger cascade region produced by the 14-MeV neutrons relative to those produced by fission-reactor neutrons with a coupled reduced resistivity increase for 14-MeV neutrons with respect to fission-reactor neutrons for equivalent damage energies.

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab., Upton, NY (USA); Los Alamos Scientific Lab., NM (USA); California Univ., Livermore (USA). Lawrence Livermore Lab.
Sponsoring Org.:
USDOE
OSTI Identifier:
7332711
Report Number(s):
BNL-21953; CONF-760935-38
TRN: 77-004865
DOE Contract Number:  
EY-76-C-02-0016
Resource Type:
Conference
Resource Relation:
Conference: 2. topical meeting on the technology of controlled nuclear fusion, Richland, WA, USA, 21 Sep 1976
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; NIOBIUM ALLOYS; PHYSICAL RADIATION EFFECTS; TIN ALLOYS; CROSS SECTIONS; MEV RANGE 10-100; NEUTRON REACTIONS; SUPERCONDUCTING MAGNETS; THERMONUCLEAR REACTORS; ALLOYS; BARYON REACTIONS; ELECTRICAL EQUIPMENT; ELECTROMAGNETS; ENERGY RANGE; EQUIPMENT; HADRON REACTIONS; MAGNETS; MEV RANGE; NUCLEAR REACTIONS; NUCLEON REACTIONS; RADIATION EFFECTS; SUPERCONDUCTING DEVICES; 360106* - Metals & Alloys- Radiation Effects; 700202 - Fusion Power Plant Technology- Magnet Coils & Fields; 420201 - Engineering- Cryogenic Equipment & Devices

Citation Formats

Snead, Jr, C L, Parkin, D M, Guinan, M W, and Van Konynenburg, A. Determination of the damage-energy cross section of 14-MeV neutrons from critical-property changes in irradiated Nb/sub 3/Sn. United States: N. p., 1976. Web.
Snead, Jr, C L, Parkin, D M, Guinan, M W, & Van Konynenburg, A. Determination of the damage-energy cross section of 14-MeV neutrons from critical-property changes in irradiated Nb/sub 3/Sn. United States.
Snead, Jr, C L, Parkin, D M, Guinan, M W, and Van Konynenburg, A. 1976. "Determination of the damage-energy cross section of 14-MeV neutrons from critical-property changes in irradiated Nb/sub 3/Sn". United States. https://www.osti.gov/servlets/purl/7332711.
@article{osti_7332711,
title = {Determination of the damage-energy cross section of 14-MeV neutrons from critical-property changes in irradiated Nb/sub 3/Sn},
author = {Snead, Jr, C L and Parkin, D M and Guinan, M W and Van Konynenburg, A},
abstractNote = {Short samples of single-core and 19-core multifilament wires in bronze jackets have been irradiated with 14-MeV neutrons to a total fluence of 2 x 10/sup 18/ n/cm/sup 2/ using the Livermore Rotating Target Neutron source. At fluences of 1 and 2 x 10/sup 18/ n/cm/sup 2/ the critical temperature was measured, and also the critical current as a function of applied transverse magnetic field up to 175 kG to ascertain the radiation-induced changes in these properties. Measurements as a function of fluence of identical samples following reactor-neutron irradiation established the baseline for comparison of the 14-MeV results. By comparing the changes observed and relating them to the spectrum-averaged damage-energy cross section for the HFBR neutrons, a value for the damage-energy cross section for 14-MeV neutrons has been deduced of 313/sup +50//sub -80/ bkeV. Comparison of the critical current vs applied field for the two types of irradiation indicates that the flux-pinning characteristics are different for equal damage energies. This can be explained by a larger cascade region produced by the 14-MeV neutrons relative to those produced by fission-reactor neutrons with a coupled reduced resistivity increase for 14-MeV neutrons with respect to fission-reactor neutrons for equivalent damage energies.},
doi = {},
url = {https://www.osti.gov/biblio/7332711}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1976},
month = {Thu Jan 01 00:00:00 EST 1976}
}

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