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Fusion Science and Technology
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EPA issues final rule regulating “forever chemicals”
The Environmental Protection Agency announced that it will issue a rule aimed at limiting public exposure to per- and polyfluoroalkyl substances (PFAS). The final rule will designate two widely used PFAS chemicals, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), as hazardous substances under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), also known as Superfund.
According to the EPA, both PFOA and PFOS meet the statutory criteria for designation as hazardous substances.
Alexander A. Skovoroda
Fusion Science and Technology | Volume 35 | Number 1 | January 1999 | Pages 238-242
Oral Presentations | doi.org/10.13182/FST99-A11963859
Articles are hosted by Taylor and Francis Online.
The symmetrization of the magnetic trap allows to reduce the transversal losses and to increase the equilibrium β at preservation the axial asymmetry. The symmetrization principles are obtained using the topography of the module of a magnetic field B. Two principles are formulated: “Natural” Principle and “Isometric” Principle. “Natural” Principle: the isomagnetic lines (isolines B on the equilibrium magnetic surface Ψ) do not form the islands, i.e. all isomagnetic lines are closed around the magnetic axis (for closed systems around the torus as in tokamak). “Isometric” Principle: at fulfilment the “Natural” Principle the equality of the field lines lengths between any isomagnetic lines on an equilibrium surface Ψ is necessary. The known omnigenous, quasi-symmetric and orthogonal magnetic traps satisfy to this last principle.