On Plasma Rotation Induced by Traveling Fast Alfvin Waves

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Absorption of fast Alfven waves by the minority fundamental ion-cyclotron resonance, coupled with finite banana width physics, generates torque distributions and ultimately rotational shear layers in the bulk plasma, even when the toroidal wavenumber k(subscript ''phi'') = n/R of the fast wave vanishes (n=0) and cyclotron absorption introduces no angular momentum nor canonical angular momentum [F.W. Perkins, R.B. White, P.T. Bonoli, and V.S. Chan, Phys. Plasmas 8 (2001) 2181]. The present work extends these results to travelling waves with non-zero n where heating directly introduces angular momentum. Since tokamak fast-wave antennas have approximately one wavelength per toroidal field coil, the ... continued below

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265 Kilobytes pages

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Perkins, F.W.; White, R.B. & Chan, and V.S. August 9, 2001.

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Absorption of fast Alfven waves by the minority fundamental ion-cyclotron resonance, coupled with finite banana width physics, generates torque distributions and ultimately rotational shear layers in the bulk plasma, even when the toroidal wavenumber k(subscript ''phi'') = n/R of the fast wave vanishes (n=0) and cyclotron absorption introduces no angular momentum nor canonical angular momentum [F.W. Perkins, R.B. White, P.T. Bonoli, and V.S. Chan, Phys. Plasmas 8 (2001) 2181]. The present work extends these results to travelling waves with non-zero n where heating directly introduces angular momentum. Since tokamak fast-wave antennas have approximately one wavelength per toroidal field coil, the toroidal mode number n lies in the range n = 10-20, independent of machine size. A zero-dimensional analysis shows that the rotation rate arising from direct torque is comparable to that of the rotational shear layer and has the same scaling. Nondimensional rotation profiles for n = (-10, 10) show modest changes from the n = 0 case in the expected direction. For a balanced antenna spectrum, the nondimensional rotational profile (averaged over n = -10, 10) lies quite close to the n = 0 profile.

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265 Kilobytes pages

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INIS; OSTI as DE00788205

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  • Other Information: PBD: 9 Aug 2001

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  • Report No.: PPPL-3605
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/788205 | External Link
  • Office of Scientific & Technical Information Report Number: 788205
  • Archival Resource Key: ark:/67531/metadc718642

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  • August 9, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 15, 2016, 10:05 p.m.

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Perkins, F.W.; White, R.B. & Chan, and V.S. On Plasma Rotation Induced by Traveling Fast Alfvin Waves, report, August 9, 2001; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc718642/: accessed May 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.