Gradient-drift (collisionless Simon-Hoh) instability is a robust instability often considered to be important for Hall plasma discharges supported by the electron current due to the E Â B drift. Most of the previous studies of this mode were based on the local approximation. Here, we consider the nonlocal model which takes into account the electron inertia as well as the effects of the entire profiles of plasma parameters such as the electric, magnetic fields, and plasma density. Contrary to local models, nonlocal analysis predicts multiple unstable modes, which exist in the regions, where local instability criteria are not satisfied. This is especially pronounced for the long wavelength modes which provide larger contribution to the anomalous transport. Published by AIP Publishing.

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The work is devoted to theoretical calculations of compression and energy release processes in the target, which is used in a magnetoinertial fusion (MIF) concept consisting of pulsed jets and intense laser radiation. A numerical technique, describing plasma-physical processes occurring in MIF system, is developed. The results of the calculation of the combined effects (pulsed jets and laser radiation acting on a cylindrical target in the end and perpendicular directions) of intense energy flows on a single-layer cylindrical target are presented. All the main plasma dynamic and radiative parameters of the compressed target plasma were found.

Using scanning tunneling microscopy ͑STM͒, we have studied the formation and structure of the Si(100)2ϫ3-Na surface phase. It has been found that both the formation process and atomic arrangement of the Si(100)2ϫ3-Na surface differ substantially from those known for 2ϫ3 reconstructions induced by other alkali and alkaline earth metals, since the Si͑100͒2ϫ3-Na phase is the only one in which the top Si layer undergoes a substantial reordering. The Si-atom density in the Si(100)2ϫ3-Na surface phase has been determined to be 1/3 ML. A structural model of the Si͑100͒2ϫ3-Na reconstruction has been proposed, and its registry to STM images has been discussed. ͓S0163-1829͑98͒01131-X͔

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