Anomalous Absorption of Electromagnetic Energy through Parametrically Induced Lower-Hybrid Turbulence

Rogister, A.

doi:10.1103/physrevlett.34.80

Cited by 25 publications

(10 citation statements)

References 8 publications

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“…It was first invoked by Sagdeev and Galeev [29] in relation to drift waves and by the authors of Ref. [30] in connection with parametric heating of plasmas. It was recognized in Ref.…”

Section: Review Of Non-linear Theorymentioning

confidence: 99%

Theoretical interpretation of experimental dibaryon resonance data

Simonov¹

1982

Sov. Phys. Usp.

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The purpose of this paper is to demonstrate that the turbulence spectra and the electron heat fluxes derived from the theory of drift wave saturation presented recently are consistent with the discharge data from two tokamaks. It is shown that the calculated rapid increase in transport with increasing linear growth rate explains the observed relaxation of the profiles towards a weakly unstable state with respect to the trappedelectron instability. It is further suggested that the occurrence of sawtooth oscillations of the core can be interpreted in terms of drift instability quenching and anomalous heat flux clamping in the surrounding gradient layer. The high-density limit derived from this assumption agrees well with the observations.

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“…It was first invoked by Sagdeev and Galeev [29] in relation to drift waves and by the authors of Ref. [30] in connection with parametric heating of plasmas. It was recognized in Ref.…”

Section: Review Of Non-linear Theorymentioning

confidence: 99%

Theoretical interpretation of experimental dibaryon resonance data

Simonov¹

1982

Sov. Phys. Usp.

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“…We also found that for kX D > 1, the growth rates were small [34], hence saturation due to ion Landau damping and convection will easily be achieved. Let us now compare these results with saturation predicted by cascading [26]:…”

Section: Orbit Diffusion Near the Lower Hybrid Frequencymentioning

confidence: 99%

“…In Table I we list some of these results. Other uses may be obtained from the literature (see Refs [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]). We note that the growth rates are obtained by replacing 7 X 7 2 -»• y 2 (or y 2 -> 7 for quasi-modes and…”

Section: (C) Purely Growing Mode (Otsi)mentioning

confidence: 99%

“…Cascading as a mechanism for saturation of the quasi-mode decay instability has been discussed recently by a number of authors [26,[45][46][47]. The low-frequency response is assumed to be represented as a highly damped wave, and the sideband is represented by its linear response in the cold plasma approximation.…”

Section: Cascading Near the Lower Hybrid Frequencymentioning

confidence: 99%

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Parametric processes in magnetically confined CTR plasmas

Porkoláb

1978

Nucl. Fusion

120

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The theory and present experimental status of parametric instabilities in CTR oriented magnetized plasmas is reviewed. Both linearized theory and the most recent non-linear theory are summarized in a compact form. The regimes of upper hybrid frequency, lower hybrid frequency, ion cyclotron frequency, Alfvén wave, and TTMP are covered. In each case the important parametric processes are discussed, including some work on the coupling to drift waves. Then recent experimental results which indicate the importance of parametric phenomena are presented.

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“…It has also been proposed that renormalized wave drag plays an important role [ Robinson , 1994], or that wave electric fields parallel to the geomagnetic field are the cause [ St.‐Maurice , 1990]. Accounts of the processes which lead to a particular form of the density spectrum in the plasma can be found in a number of papers, see for example Weinstock and Sleeper [1972], Rogister [1975], Volosevich and Liperovsky [1979], Janhunen [1995], or Liperovsky et al [1999]. Recently Dimant and Milikh [2003] and Milikh and Dimant [2003] used a particular turbulent electric field spectrum to model explicitly the electron temperature increase in the plasma turbulence and the resulting transfer of thermal energy to the neutrals.…”

Section: Introductionmentioning

confidence: 99%

Effect of electrojet irregularities on DC current flow

Buchert¹,

Hagfors²,

McKenzie³

2006

J. Geophys. Res.

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[1] A study is presented of the effect of plasma density irregularities in the auroral and equatorial electrojets on the DC currents giving rise to these irregularities. It is shown that the theory predicts extra dissipation and deviation in the direction of the mean current flow from that of E 0 Â B 0 /B 2 , in general agreement with observations. The average power input to the turbulent plasma, equal to the product of the externally applied electric field and the mean current, can be equated to the power input with that resulting in a plasma devoid of irregularities but with an increased collision frequency. Similarly one can compute the deviation in direction of the current flow due to the irregularities and compare this with the deviation caused in a plasma without irregularities, but with an increased collision frequency, and from this comparison assign an anomalous dissipation in the plasma caused by the irregularities. Our study applies elementary principles and deals with the mean current driven by an external field, including effects of the mean values of second order terms in the perturbed quantities. We do not discuss the elementary processes giving rise to the irregularities in the plasma; only their effect on the mean current flow. The anomalous dissipation or the increased apparent collision frequency, is related directly to the angular power spectrum of plasma density fluctuations. It is shown that the power dissipated by the DC current in these anomalous collisions is exactly the same as the power dissipated through normal collisions by the wave modes making up the power spectrum leading to the anomalous DC current dissipation. The study also suggests that the saturation of the instabilities, giving rise to the electrojet turbulence, is likely to be caused by the control of the current by the anomalous resistivity rather than by local nonlinear effects.

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Anomalous Absorption of Electromagnetic Energy through Parametrically Induced Lower-Hybrid Turbulence

Cited by 25 publications

References 8 publications

Theoretical interpretation of experimental dibaryon resonance data

Theoretical interpretation of experimental dibaryon resonance data

Parametric processes in magnetically confined CTR plasmas

Effect of electrojet irregularities on DC current flow

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