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An HVEM Study of Displacement Cascade Damage in Nb3Sn at 13 K

MC. BakerRT. KampwirthBJ. KestelMA. KirkHW. Weber

出版	ASTM International, 1990
URL	http://books.google.com.hk/books?id=wPd1zgEACAAJ&hl=&source=gbs_api

註釋We have begun a series of experiments to study the defect structure produced by ion irradiation in A15 superconductors. Low temperature irradiations and microscopy are performed in the high voltage electron microscope (HVEM) accelerator facility at Argonne National Laboratory, Argonne, IL. The first transmission electron microscope (TEM) images of the martensitic structure in niobium three tin (Nb3Sn) were recorded at various temperatures between 12 and 30 K. The transition to the superconducting state was observed by a slight deflection of the electron beam due to a perturbation of the magnetic field of the objective lens at the sample. The primary interest is in irradiation effects due to fast neutrons from a fusion reactor, and therefore, ion irradiation conditions that are somewhat comparable to this were selected. These consisted of 50 keV Xe+ irradiations to simulate neutron produced cascades in a near surface region (