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Fusion Science and Technology
Latest News
DNFSB’s Summers ends board tenure, extending agency’s loss of quorum
Lee
Summers
The Defense Nuclear Facilities Safety Board, the independent agency responsible for ensuring that Department of Energy facilities are protective of public health and safety, announced that the board’s acting chairman, Thomas Summers, has concluded his service with the agency, having completed his second term as a board member on October 18.
Summers’ departure leaves Patricia Lee, who joined the DNFSB after being confirmed by the Senate in July 2024, as the board’s only remaining member and acting chair. Lee’s DNFSB board term ends in October 2027.
T. Endo, K. Shibata, Y. Fujima, T. Norimatsu
Fusion Science and Technology | Volume 38 | Number 1 | July 2000 | Pages 34-41
Technical Paper | Thirteenth Target Fabrication Specialists’ Meeting | doi.org/10.13182/FST00-A36112
Articles are hosted by Taylor and Francis Online.
We carried out experiments on cooling-induced deformation (CID) of inertial-fusion fuel capsules. Polystyrene spherical shells were used as test samples. In the experiments, approximately 90 shells were cooled using liquid nitrogen and observed with an optical microscope. Pictures of each shell were recorded at 0°C and −190°C, and they were compared with each other. About a half of the tested shells showed CID, where the maximum deformation was in the order of 1% of the shell radius. Although the polystyrene shells were fabricated by a density-matched emulsion method using both hand-shaken microencapsulation and triple-orifice droplet-generator techniques, we recognized no significant difference in deformation characteristics between these two techniques. The observed CID showed poor reproducibility. We tried annealing in order to prevent CID, but no apparent improvement was recognized.