[en] The diffusion of magnetized charged particles, considered as test particles, in a turbulent plasma is analyzed. It is assumed that there is a regular, quasiuniform magnetic field B_O in the plasma. There are also large-scale stochastic fluctuations of the field, B, and of the velocity of the medium, u, which satisfy the MHD equations. The length scales of the velocity and field fluctuations are greater than the local transport mean free path of the test particles. The drift kinetic equation for the particle distribution function is averaged over an ensemble of realizations of statistically uniform and isotropic fluctuations of the magnetic field and the velocity of the medium. No upper limit is imposed on the amplitudes. A renormalization method is used to calculate the average diffusion tensor. This method leads to a system of transcendental equations for the components of the diffusion tensor. These equations can be studied analytically and numerically. Some simple analytic expressions are derived to describe the various regimes of the particle diffusion across the regular magnetic field

[en] There are many Monte Carlo biasing techniques that require approximate importance information. Often the geometry is complicated, and Monte Carlo estimates of the importance function are used in lieu of a deterministic calculation that has problems with the geometry. There are a number of Monte Carlo techniques that can be used to provide importance/biasing information. The technique described here is unique because it allows the user to divide the phase space into user-selected regions and use Monte Carlo to estimate the average region i to region j transport parameters and scores for the transport. This information is then used to form a discrete state transport problem that can be solved deterministically

[en] The reduction in the transport of particles and heat by a strong mean shear flow is studied, in the context of interchange and ion-temperature gradient turbulence models. Compared to passive scalar transport, a stronger reduction in the transport (scaling with the shearing rate Ω as ∝Ω^-3 ln Ω) results from a severe reduction in the amplitude of turbulent velocity in both models. However, the cross phase is only modestly reduced, as in the scalar field case. These results are in qualitative agreement with the results from both gyrokinetic and gyrofluid simulations of toroidal ion-temperature gradient turbulence [Lin et al., Phys. Rev. Lett. 83, 3645 (1999); Falchetto and Ottaviani, Phys. Rev. Lett. 92, 025002 (2004)], but contradict recent claims in some literature, highlighting the importance of the detailed properties of the flow in determining the overall transport level

[en] Standardization of beam line representations means that a single set of data can be used in many situations to represent a beam line. This set of data should be the same no matter what the program to be run or the calculation to be made. We have concerned ourselves with three types of standardization: (1) The same set of data should be usable by different programs. (2) The inclusion of other items in the data, such as calculations to be done, units to be used, or preliminary specifications, should be in a notation similar to the lattice specification. (3) A single set of data should be used to represent a given beam line, no matter what is being modified or calculated. The specifics of what is to be modified or calculated can be edited into the data as part of the calculation. These three requirements all have aspects not previously discussed in a public forum. Implementations into TRANSPORT will be discussed

[en] This manual provides the technical information that a FORTRAN programmer needs to write graphics computer programs. The purpose of this graphics package is to provide an internally consistent, easy-to-use set of graphic subprograms for making publication style plots and illustrations on a variety of display devices. The descriptions in this chapter give an introduction to simple plotting. The intent has been to present an overview in the hope that, with an idea of what is going on, more general methods will be easier to learn

[en] It is shown that the presence of a critical field amplitude below which velocity space diffusion can be accurately described by the quasilinear theory, but above which the diffusion coefficient becomes too small to be explained by the resonance broadening theory. The departure of the diffusion coefficient is accompanied by a simultaneous deviation of the friction coefficient from the quasilinear theory. (author)

No abstract available

[en] We reconsider the important question of the effect of a strong mean shear flow on the transport of a passive scalar field. By incorporating the effect of resonance, we show that the flux scales with the mean shear Ω as Ω^-1. The results also indicate that the scaling of the flux and cross phase with shear is rather weak and that the cross phase is not always more heavily suppressed than the amplitude of the turbulence. Furthermore, we show that the scalings of flux and cross phase with Ω depend on the statistics of the turbulent flow

[en] We have considered the transport property and the origin of the quasigap in the randomly distributed system of the aggregation that corresponds to the correlated unit-cell configurations, in which the nearest distance between each configuration is ∼2π/2k_F

[en] Some mathematical properties of steady-state equation of even flux are shown in variational formalism. This theoretical frame allows to study the existence of a solution and its asymptotical behavior in opaque media (i.e. the relation with scattering equation). At last it allows to qualify the convergence velocity of resolution iterative processes used practically