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Träfflista för sökning "WFRF:(Lisak Mietek 1947 ) ;pers:(Lisak Mietek 1947)"

Sökning: WFRF:(Lisak Mietek 1947 ) > Lisak Mietek 1947

  • Resultat 41-50 av 167
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41.
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42.
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43.
  • Fülöp, Tünde, 1970, et al. (författare)
  • Magnetic field threshold for runaway generation in tokamak disruptions
  • 2008
  • Ingår i: 35th European Physical Society Conference on Plasma Physics, EPS 2008 Combined with the 10th International Workshop on Fast Ignition of Fusion Targets; Hersonissos, Crete; Greece; 9 June 2008 through 13 June 2008. - 9781622763351 ; 32:2, s. 1014-1017
  • Konferensbidrag (refereegranskat)abstract
    • Experimental observations on large tokamaks show that the number of runaway electrons produced in disruptions depends sensitively on the magnetic field strength. The presence of a whistler wave instability (WWI) excited by runaway electrons may be the reason for this observation since the linear growth rates of these waves are such that they are stable for high magnetic field (so the runaway beam can form) but unstable for low magnetic field. The quasi-linear diffusion process due to the WWI represents a very efficient pitch-angle scattering mechanism for runaways and consequently may stop runaway beam formation. In this work, the criterion for runaway suppression by WWI is compared with a criterion for substantial runaway production obtained by calculating how many runaway electrons can be produced before the induced toroidal electric field diffuses out of the plasma.
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44.
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46.
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47.
  • Galant, Grzegorz, 1985, et al. (författare)
  • Simplified models for the nonlinear evolution of two fast-particle-driven modes near the linear stability threshold
  • 2011
  • Ingår i: Physica Scripta. - : IOP Publishing. - 1402-4896 .- 0031-8949. ; 83:5, s. 055502-
  • Tidskriftsartikel (refereegranskat)abstract
    • An analytical model that is based on purely differential equations of the nonlinear dynamics of two plasma modes driven resonantly by high-energy ions near the instability threshold is presented here. The well-known integro-differential model of Berk and Breizman (BB) extended to the case of two plasma modes is simplified here to a system of two coupled nonlinear differential equations of fifth order. The effects of the Krook, diffusion and dynamical friction (drag) relaxation processes are considered, whereas shifts in frequency and wavenumber between the modes are neglected. In spite of these simplifications the main features of the dynamics of the two plasma modes are retained. The numerical solutions to the model equations show competition between the two modes for survival, oscillations, chaotic regimes and 'blow-up' behavior, similar to the BB model.
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48.
  • Garnier, J., et al. (författare)
  • Toward a wave turbulence formulation of statistical nonlinear optics
  • 2012
  • Ingår i: Journal of the Optical Society of America B: Optical Physics. - 1520-8540 .- 0740-3224. ; 29:8, s. 2229-2242
  • Tidskriftsartikel (refereegranskat)abstract
    • During this last decade, several remarkable phenomena inherent to the nonlinear propagation of incoherent optical waves have been reported in the literature. This article is aimed at providing a generalized wave turbulence kinetic formulation of random nonlinear waves governed by the nonlinear Schrodinger equation in the presence of a nonlocal or a noninstantaneous nonlinear response function. Depending on the amount of nonlocal (noninstantaneous) nonlinear interaction and the amount of inhomogeneous (nonstationary) statistics of the incoherent wave, different types of kinetic equations are obtained. In the spatial domain, when the incoherent wave exhibits fluctuations that are statistically homogeneous in space, the relevant kinetic equation is the wave turbulence (Hasselmann) kinetic equation. It describes, in particular, the process of optical wave thermalization to thermodynamic equilibrium, which slows down significantly as the interaction becomes highly nonlocal. When the incoherent wave is characterized by inhomogeneous statistical fluctuations, different forms of the Vlasov equation are derived, which depend on the amount of nonlocality in the system. This Vlasov approach describes, in particular, the processes of incoherent modulational instability and the formation of localized incoherent soliton structures. In the temporal domain, the noninstantaneous nonlinear response function is constrained by the causality condition. It turns out that the relevant kinetic equation has a form analogous to the weak Langmuir turbulence equation, which describes, in particular, the formation of nonlocalized spectral incoherent solitons. In the regime of a highly noninstantaneous nonlinear response and a stationary statistics of the incoherent wave, the weak Langmuir turbulence equation reduces to the Korteweg-de Vries equation. Conversely, in the regime of a highly noninstantaneous response in the presence of a nonstationary statistics, we derive a long-range Vlasov-like kinetic equation in the temporal domain, whose self-consistent potential is constrained by the causality condition. From a broader perspective, this work indicates that the wave turbulence theory may constitute the appropriate theoretical framework to formulate statistical nonlinear optics.
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49.
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50.
  • Hall, Björn, 1973, et al. (författare)
  • Pump-probe collision in optical fibers : Four-wave-mixing induced frequency jump
  • 2001
  • Ingår i: Journal of the Optical Society of America. B, Optical physics. - : Optical Society of America (OSA). - 0740-3224 .- 1520-8540. ; 18:11, s. 1652-1658
  • Tidskriftsartikel (refereegranskat)abstract
    • An investigation is made of ultrafast pump-probe pulse collisions near the zero-dispersion wavelength in an optical single-mode fiber. A steplike probe frequency shift is observed when the pump power is gradually increased. The magnitude of this frequency jump is shown to depend on the phase difference between the pulses. This new effect is investigated numerically and experimentally and is attributed to four-wave mixing.
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  • Resultat 41-50 av 167
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Anderson, Dan, 1943 (138)
Puech, J. (70)
Semenov, V.E. (51)
Semenov, V. (29)
Rasch, Joel, 1982 (22)
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Fülöp, Tünde, 1970 (17)
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Buyanova, M. (12)
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Jordan, Ulf, 1974 (11)
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Lapierre, L. (10)
Breizman, B. N. (9)
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Smith, Håkan, 1976 (8)
Udiljak, R. (8)
Olsson, T (7)
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Hall, Björn, 1973 (3)
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