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Fusion Science and Technology
July 2025
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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.
R. W. Luo, A. L. Greenwood, A. Nikroo, C. Chen
Fusion Science and Technology | Volume 55 | Number 4 | May 2009 | Pages 456-460
Technical Paper | Eighteenth Target Fabrication Specialists' Meeting | doi.org/10.13182/FST09-A7426
Articles are hosted by Taylor and Francis Online.
One suggested approach to decreasing preheat of Laboratory for Laser Energetics cryotargets is to add a silicon dopant ~4 to 6 at.% to normal plasma polymer. As in the case of pure CH and CD shells used previously, the physical properties of these shells are of utmost importance to allow proper fielding for cryogenic shots. We have fabricated and characterized two types of Si-doped glow discharge polymer (GDP) capsules: single-layer Si-doped GDP shells (SiGDP) and double-layer Si-doped GDP/SCD shells (SiGDP/SCD).The Si-doped GDP shells with an ~870-m diameter and 5-m-thick walls were fabricated to meet the cryogenic direct laser fusion experiment requirements. Si-doped GDP shells with <0.25-m wall variation and 5% silicon dopant level were delivered. These cryogenic shells can survive a 1000-atm D2 or deuterium-tritium fill and cryogenic cooling without bursting or buckling. With an average buckle strength of 70 psi, a half-life of 12 s, and a D2 permeability at 20°C of 2.4 × 10-14 (mol × m/m2 × Pa × s), Si-doped GDP shells meet the criteria for cryogenic experiments. A possible drawback of the SiGDP layer is its rapid OH pickup due to exposure to air, which can increase the amount of infrared light absorbed in the shell wall as compared to D2 ice and possibly result in a poor ice uniformity during the cryogenic layering process. The absorption coefficient of the SiGDP at 3160 cm-1 measured by Fourier transform infrared spectroscopy is ~48 cm-1 at 0.1 h to ~130 cm-1 at 167 h of air exposure.