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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.
Osamu Mitarai, Sigeru Sudo
Fusion Science and Technology | Volume 27 | Number 4 | July 1995 | Pages 377-388
Technical Paper | Plasma Engineering | doi.org/10.13182/FST95-A30358
Articles are hosted by Taylor and Francis Online.
Ignition characteristics in deuterium-tritium helical (stellarator) reactors of various sizes are studied with the operation path method on the plane and the POPCON method. Based on empirical large helical device scaling, confinement must be improved by a factor > 1.5 for reaching ignition and a factor >γH = 2 for optimum fusion power in a helical reactor with R > 8 m, ā = 2 m, and B0 > 6 T. The density limit and the confinement time saturation effect with respect to the density degrade the favorable density scaling of the confinement time (τE ∝ n0.69) and are found to be important limiting factors for ignition characteristics. For a reactor with R = 10 m, ā = 2 m, γH = 2, and B0 = 7 T and with an excess heating power Pex = 100 MW, the minimum auxiliary heating power is ∼55 MW at an operating density 40% below the density limit, and ignition can be reached in a finite time. The ignition characteristics for larger size reactors (R = 15 and 20 m) and gyro-reduced Bohm scaling are also studied.