Magnetic fluctuations can contribute to plasma transport, ''self-consistency constraints'' notwithstanding

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The recent conclusion that in a turbulent, collisionless plasma ''magnetic transport including quasilinear magnetic flutter transport ... does not contribute to the relaxation of (f), and thus is not responsible for electron energy or momentum transport'' is shown to be incorrect for a variety of situations of physical interest, including saturation by quasilinear plateau formation, induced scattering, and, most importantly, conventional mode coupling. The well-established theory of the mean infinitesimal response function and the spectral balance equation provides a unifying framework for understanding the above conclusion. In particular, the cancellations which lead to their conclusion are special cases of well-known ... continued below

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Pages: 41

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Krommes, J.A. & Kim, Chang-Bae September 1, 1987.

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Description

The recent conclusion that in a turbulent, collisionless plasma ''magnetic transport including quasilinear magnetic flutter transport ... does not contribute to the relaxation of (f), and thus is not responsible for electron energy or momentum transport'' is shown to be incorrect for a variety of situations of physical interest, including saturation by quasilinear plateau formation, induced scattering, and, most importantly, conventional mode coupling. The well-established theory of the mean infinitesimal response function and the spectral balance equation provides a unifying framework for understanding the above conclusion. In particular, the cancellations which lead to their conclusion are special cases of well-known relationships between the response function, particle propagator, and dielectric function. A more general, concise, and manifestly gauge-invariant algebraic derivation of the cancellations is given. Though the cancellations occur in a certain limit, these conclusions do not follow in general: The picture of steady-state turbulence as consisting of small-scale ''incoherent'' ballistic ''clumps'' shielded by long-wavelength ''coherent'' dielectric response is physically misleading and mathematically incomplete, as it ignores or mistreates the often dominant process of renormalized n-wave coupling. Thus, when ion nonlinearities are considered, formulas for the magnetic contribution to transport emerge which are quite similar to the quasilinear one. Furthermore, limits are possible in which all or part of the noise can be negligible, yet in which the total fluctuation spectrum remains finite. 56 refs.

Physical Description

Pages: 41

Notes

NTIS, PC A03/MF A01; 1.

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  • Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted

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  • Other: DE88003458
  • Report No.: PPPL-2473
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/5867927 | External Link
  • Office of Scientific & Technical Information Report Number: 5867927
  • Archival Resource Key: ark:/67531/metadc1099000

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  • September 1, 1987

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • May 11, 2018, 3:24 p.m.

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Krommes, J.A. & Kim, Chang-Bae. Magnetic fluctuations can contribute to plasma transport, ''self-consistency constraints'' notwithstanding, report, September 1, 1987; New Jersey. (digital.library.unt.edu/ark:/67531/metadc1099000/: accessed August 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.