J/sub c/ changes after neutron irradiation of Nb/sub 3/Sn at 8 K

Journal Article · Sat Jan 01 04:00:00 EST 1977 · IEEE Trans. Magn.; (United States)

DOI:https://doi.org/10.1109/TMAG.1977.1059313· OSTI ID:5379396

Brown, B S; Blewitt, T H; Scott, T L; Wozniak, D G

In order to understand radiation effects in fusion magnet materials under operating conditions, the critical current (J/sub c/) and critical temperature (T/sub c/) have been measured up to 3.2 T as a function of dose after fast neutron irradiation at 6/sup 0/K in Nb/sub 3/Sn and after thermal neutron irradiation at 8/sup 0/K in 0.1 a/o /sup 235/U--Nb/sub 3/Sn. Experimentally determining an equivalent fast-neutron dose for the latter fission-fragment damage allows comparison of the irradiations. Increases in high J/sub c/ material (1.5 x 10/sup 6/ A/cm/sup 2/ at 4.5 K and 3.2 T) were observed after 1 x 10/sup 18/ n/cm/sup 2/ (E greater than 0.1 MeV). An extension of the dose up to 2.5 x 10/sup 19/ n/cm/sup 2/ resulted in decreases in J/sub c/ by a factor of 20 and decreases in T/sub c/ from 18 to 11/sup 0/K. The results are explained by a model that considers enhanced flux pinning (F/sub p/) by the radiation-induced defect cascades at low doses. At higher doses the decreases in T/sub c/ dominate and lower F/sub p/. The field dependence of the F/sub p/ changes can be explained by considering changes in H/sub c2/. The model predicted the observed J/sub c/ changes in the /sup 235/U--Nb/sub 3/Sn. The J/sub c/ changes differ from those found after neutron irradiations at 400/sup 0/K due to the different flux pinning characteristics of the different defect structures.

• Research Organization: Argonne National Lab., IL
• OSTI ID: 5379396
• Journal Information: IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. MAG-13:1; ISSN IEMGA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
360106 -- Metals & Alloys-- Radiation Effects
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALLOYS
ALPHA DECAY RADIOISOTOPES
BARYONS
CRITICAL CURRENT
CRITICAL FIELD
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CURRENT DENSITY
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
EVEN-ODD NUCLEI
FERMIONS
HADRONS
HEAVY NUCLEI
INTERMETALLIC COMPOUNDS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MAGNETIC FIELDS
MAGNETIC FLUX
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
NUCLEI
NUCLEONS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIOISOTOPES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TIN ALLOYS
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE
URANIUM 235
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES