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- W1648888923 abstract "The quasilinear relaxation of a fast ion beam due to unstable Alfven waves is analyzed in connection with the problem of a two-component tokamak. Quasilinear relaxation is incorporated in a calculation of the thermonuclear efficiency (Q) of a two-component--tokamak fusion reactor. If the quasilinear relaxation is assumed to occur instantaneously, the thermonuclear Q is lower than the classical value, calculated for purely Coulomb relaxation of the beam, by an average factor of five. Magnetic shear causes a nearly instantaneous quasilinear relaxation by stable Alfven noise in the absence of shear) to convert into a slow diffusive spreading of the beam distribution function. This spreading comes to a halt in a time comparable to the characteristic Coulomb time. The local value of Q falls off significantly in this case only near the center of the plasma column, where the shear is small. Q averaged over the column, on the other hand, decreases by only a few percent from the classical value if the beam density does not have a maximum at the center of the plasma column." @default.
- W1648888923 created "2016-06-24" @default.
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- W1648888923 date "1978-07-01" @default.
- W1648888923 modified "2023-09-26" @default.
- W1648888923 title "Relaxation of a fast ion beam in a tokamak plasma" @default.
- W1648888923 hasPublicationYear "1978" @default.
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