May 29, 2017 to June 2, 2017
Intercontinental Hotel
Europe/Zurich timezone
There is a live webcast for this event.

Neutron irradiation

May 30, 2017, 5:00 PM
2h 24m
Intercontinental Hotel

Intercontinental Hotel

Budapester Str. 2, 10787 Berlin, Germany
Board: 2TUP78

Speaker

Stephan Pfeiffer (TU Vienna)

Description

For the design of FCC-hh superconducting magnets an increase of the high field critical currents in commercial Nb3Sn wires by about 50 % is required. Feasibility of reaching this target has already been demonstrated by fast neutron irradiation induced defects. In this study, the underlying mechanisms are investigated through combined microstructural and magnetic analysis for realization in an industrial process.

A research reactor was used to irradiate Nb3Sn wires and TEM samples. Micro- and nanostructural examinations of grain geometry, grain boundary morphology, compositional gradients, local texture and defect structure were performed by transmission electron microscopic methods such as HRTEM, EDX, EELS and selected area diffraction before and after irradiation. The results thereof are correlated with superconducting measurements such as transport, magnetometry and scanning Hall probe experiments to determine the global critical current as well as the local critical current density within the subelements.

This study contributes to a better understanding of the influence of irradiation damage and the resulting microstructure on local superconducting properties and ultimately on the macroscopic performance of the superconductor.

Primary author

Stephan Pfeiffer (TU Vienna)

Co-authors

Amalia Ballarino (CERN) Dr Johannes Bernardi (Technische Universität Wien (TU Wien)) Michael Eisterer Michael Stöger-Pollach (TU Vienna) Thomas Baumgartner (TU Wien, Atominstitut)

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