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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Nuclear Technology
Fusion Science and Technology
July 2025
Latest News
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.
R. Gangradey, J. Mishra, S. Mukherjee, P. Nayak, P. Panchal, J. Agarwal, V. Gupta
Fusion Science and Technology | Volume 77 | Number 5 | July 2021 | Pages 333-339
Technical Paper | doi.org/10.1080/15361055.2021.1904770
Articles are hosted by Taylor and Francis Online.
A cryopump works on the principle of cooling down a metal surface or a surface coated with a porous material, namely, cryopanels, to cryogenic temperature. The gases stick to cryopanels thus lowering pressure and thereby creating a vacuum in an enclosed space. Materials used in the development of cryopumps include metals like copper and steel as structural materials, composite material like G10 for supports, thermal insulation, adhesive to fix sorbent to the metal surface, Vespel as an insulator, and various kinds of coatings on metal surfaces. Thermal properties govern heat load management and thereby the temperature of the cryopanels and hence pumping phenomena. This paper focuses on the experimental investigation of properties like specific heat, thermal diffusivity, thermal conductivity of materials, and their variation with lowering of temperature to cryogenic levels. A study was carried out to quantify the thermal properties of adhesive to fix the sorbent, the metal sheet of the cryopanel coated with activated charcoal granules using the adhesive, materials like G10 and Vespel, and high-emissivity black coating. The thermal conductivity (studied up to −150°C) for different kinds of adhesives was found to be in the range of 0.48 to 0.9 W/m‧K; for Vespel SP21 and G10, it is 0.58 and 0.8 W/m‧K, respectively. The emissivity at room temperature of the sorbent-coated cryopanels was 0.94, and for the high-emissivity black coating, it was in the range of 0.93 to 0.94.