The results of the experimental studies of the high-power e-beam accelerator producing six radially convergent electron beams are presented. The studies are aimed to increase the energy of the electron beam transported through the foil into the gas-filled chamber by using the rod-shaped current returns in the diode at small inter-electrode gaps. Installation of these rod current returns shields the periphery regions of the diode from the current field in the central part thus reducing the field at the diode edge. The inter-electrode distance, the shape, and the sizes of the cathodes are chosen by taking into account the magnetic field reduction in the diode. It is shown that in such type of the diode the electrons impact the foil almost normally to its surface, and the electron beams enter the output windows completely. Such type of the diode allows increasing the efficiency of the electron beam energy transfer into the gas by 30%.

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Results of the physical simulation and numerical calculations of magnetic field of the high power vacuum diode with a large electron beam cross section in the absence and with diode installed return current conductors in the form of rods are given. It is shown that the use of rods decreases the magnetic induction at the edge of the beam, while the field in the central part of the diode increases. It is found that the distribution of the magnetic field in the interelectrode cathode-anode gap in the presence of rods depends on the gap length between the back side of the cathode and the walls of the vacuum chamber. The location of the rods that halves the induction of the magnetic field at the edge of the cathode with the reasonable induction increase in the central part is found.

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The Schwinger boson mean-field k r i e s of lhe '7-3' model are extended by the consideration of anisotropic order parameters. This has two effects: litst, a collinear phase in which the spins are antiferrornagnetidly aligned in one direction and ferromagnetically aligned in the other, is found lo be stable over a significant range of the phase diagram; second, Lhe (1, I ) and (1,O) spiral phases temme very close in energy. The inclusion of weak intrasublattice coupling may therefore stabilirc the (1.0) spiral with respect to the (1.1) spiral, lhus harmonizing themy and experimenl.