Simplified algorithm of electrostatic fields analysis

Abstract

Cross-field diffusion due to the convective cells in a magnetoactive uniform plasma has been of current interest in plasma physics [I-31. In present report the diffusion in turbulent plasma under conditions of parametric interaction of lower hybrid waves with short-wavelength (kp,, >> I , k, = 0 ) and long-wavelength (kp,, << 1, k, # 0 ) convective cell modes is studied.For the parametric decay of lower-hybrid pump wave into a daughter wave and the modified convective cells plasma diffusion coefficient is found.Numerical calculations show that the diffusion term due to the pump wave is dominated in comparison with the diffusion which takes place in the plasma in the presence of the thermal fluctuations only.The present results can be of interest for the investigation of anomalous transport processes in laboratory and space plasmas.Algorithm of electrostatic field analysis formed by complex configuration electrode system is considered. The algorithm is based on Fourier transmission of electrode profile. The function of electrode profile is smoothed out with help of low-pass filter to produce equipotential line. In dependently on distance between the equipotential line and the electrode the frequency response of low-pass filter is changed. Reducing of cut-off frequency of filter corresponds to increasing of distance.With help of proposed algorithm to obtain equipotential line for electrostatic systems with electrode profile describer by unambiguous functions easily succeed. Typical examples are different inserts into waveguides and strip transmission lines. 220

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