Toward a linear theory of high current dielectric amplifiers using relativistic electron beams
Toward a linear theory of high current dielectric amplifiers using relativistic electron beams
A.F. Aleksandrov, M.V. Kuzelev, O.E. Pyrkina
An idealized model - a uniform dielectric waveguide permeated by a dense, magnetized electron beam - is examined. It is found that an increase in the beam current results in a narrowing of the amplification zone and its shift into a frequency range greater than the resonant. At the same time the Compton mode of operation of the amplifier shifts into a Raman mode or into an anomalous Doppler mechanism. The dependence of the amplification coefficient on the misalignment of the frequency at different values of the beam current is cited.
Show AbstractThe effect of resonant radiation capture on polarization of the active medium of gas lasers
The effect of resonant radiation capture on polarization of the active medium of gas lasers
V.A. Klivadenko, G.E. Puzyrevskaya
Polarization of the active medium of a gas laser is calculated on the basis of a system of quantum kinetic equations for density matrix elements with consideration of radiation capture. A precise expression for the actual and imaginary parts of complex polarizability is acquired within the cited approximation. The results are valid for arbitrary fields and for any relations between the relaxation constants. It is shown that capture may noticeably affect the size of the complex polarizability.
Show AbstractGeneration of a second harmonic and a total frequency with reflection from a silicon surface implanted with phosphorus ions: diagnosis of crystalline structure randomization
Generation of a second harmonic and a total frequency with reflection from a silicon surface implanted with phosphorus ions: diagnosis of crystalline structure randomization
M.F. Galyautdinov, S.V. Govorkov, N.I. Koroteev, I.B. Khaibullin, I.L. Shumai
Observation of orientational relations of the intensity of the second harmonic and the total frequency generated with reflection from the (111) cut of a silicon surface implanted with phosphorus ions is reported. The experiment showed that a rise in the implantation dose results in a drop in the relative value of the anisotropic contribution to the signal, which corresponds to a gradual rise in the degree of randomization of the crystalline structure.
Show AbstractPulsed optical effects on near-electrode processes
Pulsed optical effects on near-electrode processes
P.V. Kozlov, E.K. Kozlova, A.I. Portnyagin
The characteristics are studied of the behavior of electrode potential with pulsed optical effects on an electrochemical cell when a simultaneous displacement of the thermal, chemical, and electrical equilibrium occurs on the metal and electrolyte interface. It is discovered that the surge in potential reaches 0.5-0.6 V. The times it takes for the system to lose equilibrium and to return exceed the laser pulse duration by several orders of magnitude.
Show AbstractHyperfine fields in $^{27}$Al nuclei in (Co$_{1-x}$Cu$_x$)$_2$MnAl alloys
Hyperfine fields in $^{27}$Al nuclei in (Co$_{1-x}$Cu$_x$)$_2$MnAl alloys
P.N. Stetsenko, V.V. Surikov, V.S. Pokatilov, A.I. Laskin, Yu.I. Avksentev
The values of the lattice parameter, the mean magnetic moment, and the hyperfine field are experimentally determined in $^{27}$Al nuclei at T = 4.2 K in (Co$_{1-x}$Cu$_x$)$_2$MnAl alloys. A space overlap model is used in discussing the results.
Show AbstractExperiment on the nuclear composition and energy spectra of solar cosmic rays on the Prognoz-9 spacecraft
Experiment on the nuclear composition and energy spectra of solar cosmic rays on the Prognoz-9 spacecraft
S.A. Belyakov, Ju.P. Gordeev, Yu.I. Denisov, G.Ya. Kolesov, A.N. Podorol'skii, B.A. Nikitin
An instrument with semiconductor telescopes is described; the basic factors determining its resolving power are considered; experimental data characterizing the operation of the instrument on a spacecraft are given.
Show AbstractSolution of the Helmholtz equation in a strip with piecewise-constant non-self-conjugate boundary conditions
Solution of the Helmholtz equation in a strip with piecewise-constant non-self-conjugate boundary conditions
V.P. Modenov
A scheme for the orthogonal Galerkin method is constructed on the basis of generalization of the partial-region method to a complex space with a pseudoscalar product. This scheme is applicable to the solution of the boundary problem for the Helmholtz equation in a strip with piecewise-constant non-self-conjugate boundary conditions of impedance type.
Show AbstractAccuracy and reliability of experimental interpretation
Accuracy and reliability of experimental interpretation
Yu.P. Pyt'ev
The accuracy of experimental interpretation is determined by the model of the measurement scheme adopted and so does not allow the experimental results to be fully characterized if the reliability of the model is unknown. The concept of the reliability of the model is defined and analyzed in the present work as the minimum probability of erroneous rejection of the model on the basis of measurement results in some set of alternatives.
Show AbstractAsymptotic investigation of the rapid growth in the second moment of a magnetic field in a mirror-symmetric flow
Asymptotic investigation of the rapid growth in the second moment of a magnetic field in a mirror-symmetric flow
O.V. Artamonova, D.D. Sokolov
An asymptotic solution of the Kazantsev equation is constructed in the limit of high magnetic Reynolds numbers; the rate of growth in the energy, the excitation threshold, and the structure of the magnetic-field correlation function are calculated, and compared with the results of numerical integration of the Kazantsev equation.
Show AbstractRelativistic spectrum of a two-meson bound state in scalar electrodynamics
Relativistic spectrum of a two-meson bound state in scalar electrodynamics
A.P. Martynenko, R.N. Faustov
Within the framework of scalar electrodynamics, the construction of an interaction operator of two scalar particles is considered for the local quasi-potential equation obtained by the "rationalization" method from the Logunov-Tavkhelidze equation. The relativistic spectrum of a two-meson bound state is calculated with an accuracy of $\alpha^{4}$.
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