RADIATION DAMAGE TO BSCCO-2223 FROM 50 MEV PROTONS Page: 2 of 7
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FIGURE 1. Irradiation sample holder
The one uncertainty is the radiation resistance of the HTS material. There have been
a few studies of the radiation tolerance of HTS materials [2,3], but they have been at fluxes
lower than the estimated lifetime 101 n/cm2  that coils will be exposed to. The current
material that is under consideration is BSCCO-2223, so we have undertaken irradiation of
Because the only high neutron fluxes that are readily available are in reactors where
the energy spectrum does not match the very high-energy neutrons that produce most of the
dose in the magnet, we substitute protons from an accelerator. This will not give us a direct
estimate of the expected lifetime, but the known sensitivity 1 of Nb3Sn to high-energy
protons can be used as a reference.
BSCCO-2223 tape from American Superconductor (ASC) and Sumitomo Electric
Industries (SEI) were used for the irradiation studies. The tapes were about 4 mm wide and
approximately 0.2 mm thick. The tapes were mainly silver (60-70%) and did not have a
stainless steel reinforcing. The stainless steel produces long-lived activities, so was not
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Zeller, A.F.; Ronningen, R.M.; Godeke, Arno; Heibronn, L.H; McMahan-Norris, P. & Gupta, R. RADIATION DAMAGE TO BSCCO-2223 FROM 50 MEV PROTONS, article, November 1, 2007; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc893522/m1/2/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.