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Fusion Science and Technology
Latest News
WIPP improves utility shaft safety, begins infrastructure project
Harrison Western Shaft Sinkers (HWSS), the company drilling a new utility shaft at the Department of Energy’s Waste Isolation Pilot Plant in New Mexico, has retained a safety culture expert following a near-miss accident in the shaft late last year. The safety expert will conduct monthly facilitated discussions with crews working on the shaft to reinforce expectations for identifying concerns regarding unsafe circumstances, according to a recent report by the Defense Nuclear Facilities Safety Board (DNFSB).
S. W. Haan, D. S. Clark, S. H. Baxamusa, J. Biener, L. Berzak Hopkins, T. Bunn, D. A. Callahan, L. Carlson, T. R. Dittrich, M. J. Edwards, B. A. Hammel, A. Hamza, D. E. Hinkel, D. D. Ho, D. Hoover, W. Hsing, H. Huang, O. A. Hurricane, M. A. Johnson, O. S. Jones, A. L. Kritcher, O. L. Landen, J. D. Lindl, M. M. Marinak, A. J. MacKinnon, N. B. Meezan, J. Milovich, A. Nikroo, J. L. Peterson, P. Patel, H. F. Robey, J. D. Salmonson, V. A. Smalyuk, B. K. Spears, M. Stadermann, S. V. Weber, J. L. Kline, D. C. Wilson, A. N. Simakov, A. Yi
Fusion Science and Technology | Volume 70 | Number 2 | August-September 2016 | Pages 121-126
Technical Paper | doi.org/10.13182/FST15-244
Articles are hosted by Taylor and Francis Online.
Experiments and analysis in the 3 years since the 2012 Target Fabrication Meeting have resulted in significant improvement in understanding of the requirements for high-performance layered implosions. Three issues have been identified that significantly degrade the performance of the implosions as they were originally configured for National Ignition Facility experiments: capsule support system, time-dependent radiation asymmetry, and transverse oxygen nonuniformity in the glow discharge polymer (GDP) ablator. Analyses suggest that the shortfalls in these three areas can explain the degraded performance of the National Ignition Campaign implosions. We present the status of work toward curing these three problems in the standard GDP ablator/gold hohlraum configuration as they affect target fabrication priorities. We also summarize the prospects for alternate ablators that might reduce these degradation mechanisms.