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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.
G.M.D. Hogeweij
Fusion Science and Technology | Volume 37 | Number 2 | March 2000 | Pages 305-312
Instabilities and Transport | doi.org/10.13182/FST00-A11963225
Articles are hosted by Taylor and Francis Online.
By inducing a small electron temperature perturbation in a plasma in steady state one can in principle determine the conductive and convective components of the electron heat flux, and the associated thermal diffusivity and convection velocity. The same can be done for other plasma parameters, like density or ion temperature.
Experiments show that the response of the temperature in most cases is determined by diffusion. It is in principle possible to determine elements of the matrix of transport coefficients. Interestingly, off-diagonal elements in the transport matrix appear to be important.
In this paper experimental techniques, analysis techniques, basic formulas etc. are briefly reviewed. Experimental results are summarized. The fundamental question whether the fluxes are linear functions of the gradients or not is discussed.
When inducing edge perturbations, often plasma responses are observed which cannot be explained by a local transport model. These so-called ‘non-local’ phenomena have drawn strong attention in the last couple of years, and we will review this class of experiments as well.