Study of a converging short pressure pulse generated in a cylindrical polymer shell by an electron beam

This paper presents experimental and theoretical results from an investigation of the excitation and propagation of converging pressure waves in cylindrical shells made of polymethyl methacrylate (PMMA) producing spalling phenomena in the inner surface of the shell. It is found that fracture of the inner surface of a cylindrical shell requires a greater load as compared to the fracture of the rear side of a planar plate of the same material. The reasons for the observed phenomena are analyzed. The experimental results are compared with the results of a numerical simulation that takes into account phenomena occurring in the nonlinear region of elastoplastic deformation of polymer materials used as a base and in composite materials. Zh. Tekh. Fiz. 67, 88–94 (January 1997)     

Structural and Magnetic Properties of the Al2O3/Ge-p/Al2O3/Co System

Technical Physics - The Al2O3/Ge-p/Al2O3/Co system with an Al2O3 buffer layer deposited by ion-plasma sputtering has been experimentally investigated. The dependences of the magnetic properties of...     

Successive Compression of Microwave Pulses in a Coupled-Resonator System

We briefly analyze systems of successive resonance compression of microwave pulses and present the results of a study of resonance compression in a system of coupled resonators with energy output via interference switches. A power gain of about 18 dB was experimentally achieved in the 3 cm wavelength interval in a two-stage system with a superdimensional resonator in the first stage and a single-mode resonator in the second stage with output pulse duration of about 2.5 ns, peak power 3 MW, and efficiency 17 %.     

Generation of Submillisecond Beams of Deuterium Ions Based on a Vacuum Arc with a Gas-Saturated Zirconium Cathode

Russian Physics Journal - A vacuum arc discharge with a zirconium cathode saturated with deuterium is used to produce deuterium plasma in thermonuclear reaction studies and to generate deuterium...     

Generation of Deuterium Ions in a Vacuum Arc with Composite Gas-Saturated Cathode and in a Low-pressure Arc

Russian Physics Journal - Plasma containing deuterium ions is used, for example, to generate neutron flows. Neutrons are generated in nuclear reactions of interaction of accelerated ion beams...     

Effect of the Semiconductor Spacer on Positive Exchange Bias in the CoNi/Si/FeNi Three-Layer Structure

JETP Letters - Films consisting of a hard magnetic ferromagnet CoNi and a soft magnetic ferromagnet FeNi interacting through a nonmagnetic Si semiconductor spacer are experimentally studied. The...     

Surface Structure and Properties of Niobium Zirconium Alloy After Boron-10 Ion Implantation

Russian Physics Journal - The boron-10 ion implantation in layers on the core components can provide lower nuclear reactivity due to an abnormally large neutron-capture cross-section during the...     

Time-of-flight mass spectrometry studies of an ion beam generated by the titan source

The TITAN source generates wide-aperture beams of gas and metal ions of different materials. This is achieved because of two types of cold-cathode arc discharges, which operate simultaneously in the discharge system of the source. For metal ions to be obtained, use is made of the vacuum arc initiated between an ion-forming cathode and a hollow anode. To produce gas ions, a constricted low-pressure arc discharge is initiated with the same hollow anode. The constitution of ion beams generated by the TITAN source has been investigated using a homemade time-of-flight spectrometer. This paper describes the design of the latter and the principle of its operation, and discusses the physical peculiarities of the spectrometer operation, which affect the ion beam constitution. Institute of High Current Electronics. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 21–28, February, 2000.     

Experimental investigation of a 25-MW microwave (3-cm range) compressor prototype

An experimental study of a resonance microwave (3-cm-range) compressor with gas insulation and energy output through a superdimensional coaxial interference switch is reported. The rated parameters of the compressor are output signal power ∼25 MW, signal duration 2 ns, gain 26 dB, and efficiency ∼57%. A gain of 20 dB was achieved at a peak output signal power of 12 MW, signal duration of 2 ns, efficiency of ∼24%, and traveling wave power of 24 MW.     

On Vector Form of Differential Variational Principles of Mechanics

We introduce variation of a vector δx which can be interpreted either as a virtual displacement of a system, or as variation of the velocity of a system, or as variation of the acceleration of a system. This vector is used to obtain a unified form of differential variational principles of mechanics from the scalar representative equations of motion. Conversely, this notation implies the original equations of motion, which enables one to consider the obtained scalar products as principles of mechanics. Using the same logical scheme, one constructs a differential principle on the basis of the vector equation of constrained motion of a mechanical system. In this form of notation, it is proposed to conserve the zero scalar products of reactions of ideal constraints and the vector δx. This enables one to obtain also the equations involving generalized constrained forces from this form of notation.