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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Hash Hashemian: Visionary leadership
As Dr. Hashem M. “Hash” Hashemian prepares to step into his term as President of the American Nuclear Society, he is clear that he wants to make the most of this unique moment.
A groundswell in public approval of nuclear is finding a home in growing governmental support that is backed by a tailwind of technological innovation. “Now is a good time to be in nuclear,” Hashemian said, as he explained the criticality of this moment and what he hoped to accomplish as president.
Don M. Parkin, Donald G. Schweitzer
Nuclear Technology | Volume 22 | Number 1 | April 1974 | Pages 108-114
Technical Paper | Fusion Reactor Materials / Material | doi.org/10.13182/NT74-A16279
Articles are hosted by Taylor and Francis Online.
Multifilamentary composite wires of Nb Ti and Nb3Sn have been irradiated at 60 ± 5°C with fast neutrons to fluences of 6 × 1019 n/cm2. Measurements of the superconducting critical current, Ic , as a function of transverse field show that the NbTi wires are only moderately affected by neutron irradiation. At a fluence of 6 × 1019 n/cm2, Ic (40 kG) is 82% of the unirradiated value. The Nb3Sn composites undergo a catastrophic reduction in Ic with an apparent threshold at a fluence of 2 to 3 × 1018 n/cm2. Between 2 to 3 × 1018 and 1.1 × 1019 n/cm2, Ic (40 kG) has been reduced to 4% of the unirradiated value. At a fluence of 6×1019 n/cm2, the upper critical field of Nb3Sn has been reduced from 240 kG to 9 ± 0.5 kG. The corresponding Tc has been decreased from 16.4 to 6°K. Annealing of Nb3Sn samples irradiated to 1.1 × 1019 n/cm2 produces only 19% recovery in Ic after h at 400°C.
