Synchrotron Tomography for the Study of Void Formation in Internal Tin ${\hbox {Nb}}_{3}{\hbox {Sn}}$ Superconductors

Synchrotron absorption tomography has been applied for the study of voids formed during the thermal treatment of internal tin Nb
₃
Sn strands. Possible void formation mechanisms and in particular the effect of Sn phase transformations and melting are discussed based on a quantitative void description. Sn melting changes mainly the shape and volume of the individual voids but does not increase the total void volume in the strand