Turbulence scattering of high harmonic fast waves

Ono, M.; Hosea, J.; LeBlanc, B.; Menard, J.; Phillips, C. K.; Wilson, R.; Ryan, P. M.; Swain, D.; Wilgen, J.B.; Kubota, S.; Mau, T. K.

doi:10.1063/1.1424169

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Recent contributions to the literature have studied rf scattering from turbulence in the LH and electron-cyclotron frequency ranges 19,20 as well as the high harmonic fast wave regime. 21,22 The standard theoretical paradigm has been to model the fluctuations as a randomized spectrum of plane wave perturbations superimposed on a background plasma. Then the trajectory of the waves in configuration and k-space upon encountering many scattering events can, for example, be treated in a Fokker-Planck approximation.…”

Section: Introductionmentioning

confidence: 99%

Scattering of radio frequency waves by blob-filaments

Myra¹,

D’Ippolito²

2010

Physics of Plasmas

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Radio frequency waves used for heating and current drive in magnetic confinement experiments must traverse the scrape-off-layer (SOL) and edge plasma before reaching the core. The edge and SOL plasmas are strongly turbulent and intermittent in both space and time. As a first approximation, the SOL can be treated as a tenuous background plasma upon which denser filamentary field-aligned blobs of plasma are superimposed. The blobs are approximately stationary on the rf time scale. The scattering of plane waves in the ion-cyclotron to lower-hybrid frequency range from a cylindrical blob is treated here in the cold plasma fluid model. Scattering widths are derived for incident fast and slow waves, and the scattered power fraction is estimated. Processes such as scattering-induced mode conversion, scattering resonances, and shadowing are investigated.

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Section: Introductionmentioning

confidence: 99%

Scattering of radio frequency waves by blob-filaments

Myra¹,

D’Ippolito²

2010

Physics of Plasmas

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Fast wave evanescence in filamentary boundary plasmas

Myra

2014

Physics of Plasmas

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Radio frequency waves for heating and current drive of plasmas in tokamaks and other magnetic confinement devices must first traverse the scrape-off-layer (SOL) before they can be put to their intended use. The SOL plasma is strongly turbulent and intermittent in space and time. These turbulent properties of the SOL, which are not routinely taken into account in wave propagation codes, can have an important effect on the coupling of waves through an evanescent SOL or edge plasma region. The effective scale length for fast wave (FW) evanescence in the presence of short-scale field-aligned filamentary plasma turbulence is addressed in this paper. It is shown that although the FW wavelength or evanescent scale length is long compared with the dimensions of the turbulence, the FW does not simply average over the turbulent density; rather, the average is over the exponentiation rate. Implications for practical situations are discussed.

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Turbulence scattering of high harmonic fast waves

Cited by 2 publications

References 4 publications

Scattering of radio frequency waves by blob-filaments

Scattering of radio frequency waves by blob-filaments

Fast wave evanescence in filamentary boundary plasmas

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