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Feds, state agree on deadlines for treating Hanford’s tank waste
The U.S. Department of Energy, Washington State Department of Ecology, and U.S. Environmental Protection Agency have reached an agreement on revised plans for managing millions of gallons of radioactive and chemical liquid waste stored in 177 underground tanks at the Hanford Site near Richland, Wash.
Ezio Bittoni, Marcel Haegi
Fusion Science and Technology | Volume 18 | Number 3 | November 1990 | Pages 373-383
Alpha Particles in Fusion Research | Technical Paper | doi.org/10.13182/FST90-A29270
Articles are hosted by Taylor and Francis Online.
Calculation of alpha-particle confinement by a guiding center orbit-following numerical code requires the computation of very long particle trajectories. Due to their enormous length, these computations are subject to the possible accumulation of small errors, and the alpha-particle population is usually extrapolated from a single-particle history for every point of the initial parameter space. To overcome these difficulties, a numerical diffusion coefficient is derived for each point of the initial parameter space by averaging over a certain number of single-particle histories for each point of this space. This method has been applied to fast-alpha-particle confinement of the Next European Torus benchmark and the numerically derived diffusion coefficients are compared with analytical expressions from theoretical models.