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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.
W. M. Stacey, Jr.
Fusion Science and Technology | Volume 27 | Number 3 | May 1995 | Pages 277-291
Technical Paper | Plasma Engineering | doi.org/10.13182/FST95-A30390
Articles are hosted by Taylor and Francis Online.
The strong radial gradients that exist in the plasma edge (scrape-off layer and divertor) of tokamaks increase the magnitude of some previously neglected viscous terms to the same order as the other terms traditionally included in fluid plasma transport calculations. The standard fluid equations are modified to include these new viscous force and heat flux terms that are important in the plasma edge. These new terms give rise to viscous-driven radial particle and energy fluxes that are estimated to cause an order unity reduction in the radial peaking of energy fluxes incident on divertor collector platesy thus illustrating the importance of taking them into account in fluid calculations of divertor operation. A viscous drift velocity is found to be comparable in magnitude to the standard E × B and pressure gradient-driven drift velocities. The modified fluid equations are formulated to facilitate the inclusion of these important new viscous terms into fluid transport codes used for tokamak edge modeling.