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- W1969929409 abstract "In the guiding center theory, smooth unit vectors perpendicular to the magnetic field are required to define the gyrophase. The question of global existence of these vectors is addressed using a general result from the theory of characteristic classes. It is found that there is, in certain cases, an obstruction to global existence. In these cases, the gyrophase cannot be defined globally. The implications of this fact on the basic structure of the guiding center theory are discussed. In particular it is demonstrated that the guiding center asymptotic expansion of the equations of motion can still be performed in a globally consistent manner when a single global convention for measuring gyrophase is unavailable. The latter fact is demonstrated directly by deriving a new expression for the guiding-center Poincar'e-Cartan form exhibiting no dependence on the choice of perpendicular unit vectors." @default.
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- W1969929409 date "2012-05-01" @default.
- W1969929409 modified "2023-09-26" @default.
- W1969929409 title "Gyrosymmetry: Global considerations" @default.
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- W1969929409 doi "https://doi.org/10.1063/1.4719700" @default.
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