Two samples of Nb3Sn
multifilamentary wires 0.82 mm diameter were prepared by the bronze
method. One of the samples was internally doped with 7 vol% of
PrB6,
a large heat capacity substance (LHCS), while the other sample did not contain any LHCS and
was used for comparison. The influence of LHCS internal doping on the stability toward short (∼1 ms) heat disturbances and critical currents in a transverse external magnetic field up to 3 T
was investigated both experimentally and computationally. The average heat capacity for
the doped sample in the temperature range 4–10 K was three times larger than for the
undoped one. For the LHCS-doped sample its critical current was found to be
slightly larger than for the comparison sample (6–8% depending on the external
field), while its critical energies towards external heat disturbances were five times
larger.
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