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Fusion Science and Technology
Latest News
Strontium: Supply-and-demand success for the DOE’s Isotope Program
The Department of Energy’s Isotope Program (DOE IP) announced last week that it would end its “active standby” capability for strontium-82 production about two decades after beginning production of the isotope for cardiac diagnostic imaging. The DOE IP is celebrating commercialization of the Sr-82 supply chain as “a success story for both industry and the DOE IP.” Now that the Sr-82 market is commercially viable, the DOE IP and its National Isotope Development Center can “reassign those dedicated radioisotope production capacities to other mission needs”—including Sr-89.
S.C. McCool, A.J. Wootton, R.V. Bravenec, P.H. Edmonds, K.W. Gentle, H. Huang, J.W. Jagger, B. Richards, David W. Ross, E.R. Solano, J. Uglum, P.M. Valanju
Fusion Science and Technology | Volume 27 | Number 3 | April 1995 | Pages 444-450
Advanced Tokamak And Steady-State Sustainment Systems | doi.org/10.13182/FST95-A11947125
Articles are hosted by Taylor and Francis Online.
Recent favorable results on START have caused renewed interest in low aspect ratio tokamaks. To design an economical next-step spherical tokamak to study confinement scaling and high beta plasmas, we have developed a transport scaling and device optimization code. This code OPT, benchmarked against START, includes 10 empirical confinement scaling laws and essential tokamak physics such as stability limits. Parameters are optimized separately for each scaling law and physics goal. Using OPT we find for R/a=1.2 to 2.0 one can achieve βN=5 and <β>=30% with just two neutral beams (PNB<3.5 MW) for Ip≥0.75 MA, and Ro≥0.6 m. In contrast, if one insists on using the nominal device parameters, Ip=1 MA and Ro=0.8 m, with each scaling law, achieving βN=5 requires typically PNB⋍7.5 MW.