Труды сотрудников ИВМ СО РАН

[Text] / H. Gunell [et al.] // Planet Space Sci. - 2005. - Vol. 53, Is. 4. - P433-441, DOI 10.1016/j.pss.2004.07.021. - Cited References: 21 . - ISSN 0032-0633РУБ Astronomy & Astrophysics

Аннотация: We present simulated images of energetic neutral atoms (ENAs) produced in charge exchange collisions between solar wind protons and neutral atoms in the exosphere of Venus, and make a comparison with earlier results for Mars. The images are found to be dominated by two local maxima. One produced by charge exchange collisions in the solar wind, upstream of the bow shock, and the other close to the dayside ionopause. The simulated ENA fluxes at Venus are lower than those obtained in similar simulations of ENA images at Mars at solar minimum conditions, and close to the fluxes at Mars at solar maximum. Our numerical study shows that the ENA flux decreases with an increasing ionopause altitude. The influence of the Venus nighttime hydrogen bulge on the ENA emission is small. (C) 2004 Elsevier Ltd. All rights reserved.


Доп.точки доступа:
Gunell, H.; Holmstrom, M.; Biernat, H.K.; Erkaev, N.V.; Еркаев, Николай Васильевич

[Text] / I. V. Krasnov, L. P. Kamenshchikov // Opt. Commun. - 2014. - Vol. 312. - P192-198, DOI 10.1016/j.optcom.2013.09.036. - Cited References: 21 . - ISSN 0030-4018. - ISSN 1873-0310РУБ Optics

Аннотация: We present and analyze a novel method of long-time ion trapping. This purely optical method is based on the action of rectified gradient forces on the ions in a 3D dissipative polychromatic optical superlattice which allows one to form super-deep potential wells for the ions. The ion trap presented ensures the possibility of long-time confinement both of single ions and small ordered ensembles of strongly coupled ions, i.e. ion (Coulomb) clusters. We demonstrate, by the numerical simulations of stochastic ion motion, the trapping of two-ion clusters for times exceeding several seconds. (C) 2013 Elsevier B.V. All rights reserved,

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Держатели документа:
ИВМ СО РАН

Доп.точки доступа:
Krasnov, I.V.; Краснов, Игорь Васильевич; Kamenshchikov, L.P.; Каменщиков, Леонид Петрович

[Text] / I. V. Krasnov // Chin. Phys. B. - 2015. - Vol. 24, Is. 6. - Ст. 063701, DOI 10.1088/1674-1056/24/6/063701. - Cited References:22 . - ISSN 1674-1056. - ISSN 1741-4199РУБ Physics, Multidisciplinary

Аннотация: Conditions have been studied under which a polychromatic optical superlattice can form and trap the Coulomb cluster of two strongly interacting ions. In our previous work (Krasnov I V and Kamenshchikov L P 2014 Opt. Comm. 312 192) this new all-optical method of obtaining and confining the Coulomb clusters was demonstrated by numerical simulations for special values of the optical superlattice parameters and in the case of Yb ions. In the present paper the conditions are explicitly formulated, under which the long-lived two-ion cluster in the superlattice cell is formed. The peculiarity of these conditions is the renormalization of the ion-ion Coulomb interaction. Notably, the renormalized Coulomb force is determined by the effective charge which depends on the light field parameters and can strongly differ from the "bare" ion charge. This result can be accounted for by the combined manifestation of the quantum fluctuations of optical forces, nonlinear dependence of these forces on the velocity, and non-Maxwellian (Tsallis type) velocity distribution of the ions in the optical superlattice. Explicit analytical formulas are also obtained for the parameters of the optical two-ion cluster.

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Держатели документа:
Russian Acad Sci, Siberian Div, Inst Computat Modeling, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Krasnov, I.V.; Краснов, Игорь Васильевич

[Text] / I. V. Krasnov, L. P. Kamenshchikov // Laser Phys. - 2015. - Vol. 25, Is. 11. - Ст. 115501, DOI 10.1088/1054-660X/25/11/115501. - Cited References:26 . - ISSN 1054-660X. - ISSN 1555-6611РУБ Optics + Physics, Applied

Аннотация: On the basis of numerical simulations and analytical calculations it is proved that the dissipative optical superlattice induced by the rectified gradient force is able to create and trap cold ion Coulomb clusters. In contrast to our previous work (2014 Opt. Commun. 312 192), in the present paper, we do not use the approximation of slow ions (SI), but take into account the non-conservative nature of the trapping force in the optical superlattice as well as the velocity dependence of the friction coefficient of ions and multiplicative nature of the quantum fluctuations of optical forces. It is shown that these factors significantly affect both the formations conditions of the ion Coulomb clusters and their characteristics. It is also demonstrated that their consequences can be well-described by the renormalized SI model. In this model, the electric ion charge is replaced by the effective charge which depends on the light field parameters.

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Держатели документа:
Russian Acad Sci, Inst Computat Modelling, Siberian Div, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Kamenshchikov, L.P.; Каменщиков, Леонид Петрович; Краснов, Игорь Васильевич

/ I. L. Isaev, A. P. Gavriliuk // J. Phys. B-At. Mol. Opt. Phys. - 2018. - Vol. 51, Is. 2. - Ст. 025701, DOI 10.1088/1361-6455/aa9b98. - Cited References:26 . - ISSN 0953-4075. - ISSN 1361-6455РУБ Optics + Physics, Atomic, Molecular & Chemical

Аннотация: The method of molecular dynamics is used to study the behavior of an ultracold non-ideal ion-electron Be+ plasma in a uniform magnetic field. Our simulations yield an estimate for the rate of electron-ion collisions which is non-monotonically dependent on the magnetic field magnitude. Also they explicitly show that there are two types of diffusion: a classical one, corresponding to Brownian motion of particles, and Bohm diffusion when the trajectory of particles (guiding centers) includes substantial lengths of drift motion.

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Держатели документа:
Russian Acad Sci, Inst Computat Modeling, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660028, Russia.

Доп.точки доступа:
Isaev, I. L.; Gavriliuk, A. P.

/ I. V. Krasnov, L. P. Kamenshchikov // Laser Phys. - 2018. - Vol. 28, Is. 10. - Ст. 105701, DOI 10.1088/1555-6611/aaceee. - Cited References:28 . - ISSN 1054-660X. - ISSN 1555-6611РУБ Optics + Physics, Applied

Аннотация: We demonstrate that the earlier suggested new all-optical method of creating long-term small (containing two or three particles) ion clusters using the rectified optical forces (RFs) can be used to create cold trapped Coulomb crystals (consisting of several tens of resonant ions). The results of the supercomputer simulations of the dynamics of a mercury ion cloud in a polychromatic optical superlattice (induced by RFs) are presented and analysed. Such a cloud (including 49 ions) in the absence of the optical field expands rapidly (during the characteristic time of the order of 10(-4) s) as a result of the Coulomb explosion. It is shown that the polychromatic optical field can result in the 'quenching' of the Coulomb explosion and crystallisation of the ion cloud: creation of a quasi-2D array of ordered and strongly coupled cold ions (with the Coulomb coupling parameter Gamma similar to 10 and temperature similar to 10(-3) K). The mean destruction time of the studied metastable crystal is of the order of 10 s. Moreover, the central core of the ion cloud can retain its crystalline configuration for a much longer time.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Computat Modeling, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Krasnov, I. V.; Kamenshchikov, L. P.