Issue 1, 2023, p. 65-69


Behavior of Magnetization Changes of Nb3Sn Multifilamentary Wires after Fast Proton Irradiation with Energy up to 32 MeV

P. N. Degtyarenko

Joint Institute for High Temperatures of the Russian Academy of Sciences, 125412 , Moscow, Russia


S. Yu. Gavrilkin

Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia

A. Yu. Tsvetkov

Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia



Nb3Sn-based superconducting wires are promising candidates for use in large magnetic systems such as accelerators and future fusion reactors.Therefore it is an important task to investigate the changes of critical properties of these wires after intense irradiation by fast particles. Here we present the results on magnetization measurements of Nb3Sn multifilamentary wires after fast proton irradiation. We have investigated 4 types of wires (each samples with different diameter and ~3 mm length). The irradiation of all samples was performed at room temperature in the cyclotron by 32 MeV protons at 4 fluencies up to 1×1018 p/cm2. The magnetization measurements were carried out on unirradiated and irradiated Nb3Sn wires in a VSM device (Quantum Design PPMS system) at fields up to 6 Tesla at temperatures of 7 and 12 K. The transition temperature Tc of all samples was determined using the residual magnetic moment. The analyses of the experimental data showed that irradiation has a strong effect on both the magnitude and functional dependence of the normalized pinning force.

Keywords: low temperature superconductors, pinning, critical temperature, proton irradiation, critical current density.


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