Search results for: V. E. Fortov

Items from 1 to 20 out of 106 results

article

Estimates of the Dependence of the Fusion Neutron Yield on the Initial Plasma Density and Temperature in Fast Pinches

A. N. Starostin, A. M. Zhitlukhin, Yu. V. Petrushevich, M. D. Taran, more

JETP Letters > 2019 > 110 > 6 > 405-410

The neutron generation by hot, dense, and fast Z- and Θ-pinch plasma with the parameters achievable at the present development stage of high-power pulsed technology has been calculated. It has been proposed to use a hot plasma with a high density of 10¹⁷ cm⁻³ as an initial state for subsequent compression by Z- and Θ-pinches to achieve the conditions necessary for fusion reactions. Such plasma can...

article

Temperature Measurements of Optically Cooled Calcium Atoms Using Differential Two-Photon Spectroscopy

B. B. Zelener, A. A. Bobrov, E. V. Vilshanskaya, I. D. Arshinova, more

Doklady Physics > 2019 > 64 > 3 > 94-96

A differential two-photon method of measuring the temperature of ⁴⁰Ca atoms in a continuously operating magneto-optical trap is demonstrated. Coherent two-photon resonances at the 4s²¹S₀–50¹S₀ Rydberg transition have been investigated experimentally using resonance laser beams propagating at different angles. The temperature of the cloud of ⁴⁰Ca atoms was measured depending on the frequency detuning...

article

Laboratory Modeling of the Giant Gravitational Shift of Gamma-Radiation Frequency

V. E. Fortov, A. B. Shvartsburg

Doklady Physics > 2019 > 64 > 3 > 90-93

A laboratory experiment modeling the Einsteinian frequency shift of gamma radiation in the gravity field by means of the spectral shift in the field of the centrifugal potential, formed by the ultrafast rotation of a radiation source on a centrifuge is proposed. The resonant detector of gamma radiation immobile with respect to the source is rotating together with the source. These centrifuges traditionally...

article

Coherent Excitation of Rydberg States in the Gas of Cold ⁴⁰Ca Atoms

B. B. Zelener, I. D. Arshinova, A. A. Bobrov, E. V. Vilshanskaya, more

JETP Letters > 2018 > 108 > 12 > 820-824

The spectra of highly excited ⁴⁰Ca atoms prepared using a magneto-optical trap and an ultraviolet laser are experimentally studied. The dependence of the atomic density in the magneto-optical trap on the detuning frequency of cooling radiation and on the magnetic field gradient is determined. By using the technique based on the reduction of resonance fluorescence, the energy of the 76¹S₀ Rydberg state...

article

Measurement of Quasi-Isentropic Compressibility of Gaseous Helium at a Pressure of ~10 TPa

M. A. Mochalov, R. I. Il’kaev, V. E. Fortov, A. L. Mikhailov, more

JETP Letters > 2018 > 108 > 10 > 656-660

A nonideal helium plasma has been compressed to a density of ~9 g/cm³ by a pressure of P ~ 10000 GPa produced by an explosive charge of 85 kg of TNT in a spherical two-cascade device. The experiment has been performed on an X ray setup using simultaneously three betatrons with a boundary energy of about 60 MeV and a multichannel optoelectronic system of recording X-ray images. The pressure of the...

article

Quasi-Isentropic Compressibility of Deuterium at a Pressure of ~12 TPa

M. A. Mochalov, R. I. Il’kaev, V. E. Fortov, A. L. Mikhailov, more

JETP Letters > 2018 > 107 > 3 > 168-174

An experimental result for the quasi-isentropic compressibility of a strongly nonideal deuterium plasma compressed in a spherical device by the pressure P = 11400 GPa (114 Mbar) to the density ρ ≈ 10g/cm³ has been reported. The characteristics of the experimental device, diagnostic methods, and experimental results have been described. The trajectory of motion of metallic shells compressing a deuterium...

article

Latest Results on Complex Plasmas with the PK-3 Plus Laboratory on Board the International Space Station

M. Schwabe, C.-R. Du, P. Huber, A. M. Lipaev, more

Microgravity Science and Technology > 2018 > 30 > 5 > 581-589

Complex plasmas are low temperature plasmas that contain microparticles in addition to ions, electrons, and neutral particles. The microparticles acquire high charges, interact with each other and can be considered as model particles for effects in classical condensed matter systems, such as crystallization and fluid dynamics. In contrast to atoms in ordinary systems, their movement can be traced...

article

Thermodynamic parameters of helium under shock-wave and quasi-isentropic compressions at pressures up to 4800 GPa and compression ratios up to 900

M. A. Mochalov, R. I. Il’kaev, V. E. Fortov, A. L. Mikhailov, more

Journal of Experimental and Theoretical Physics > 2017 > 125 > 5 > 948-963

The thermodynamic parameters of a strongly nonideal helium plasma obtained in experimental devices of hemispherical and spherical geometries are presented. Under shock-wave loading in the hemispherical device, the helium plasma was compressed to a density ρ ≈ 0.76 g cm^–3 by a pressure P ≈ 83 GPa at a temperature T ≈ 51000 K. Two-cascade spherical experimental devices of two types were used under quasi-isentropic...

article

Two-photon Rydberg resonances in lithium-7 obtained by recording reduction of resonance fluorescence

B. B. Zelener, S. A. Saakyan, V. A. Sautenkov, V. E. Fortov

Doklady Physics > 2017 > 62 > 3 > 107-110

In a magneto-optical trap (MOT) of ⁷Li, two-photon Rydberg resonances are recorded by using a spectroscopic technique, which based on variation in the resonance fluorescence. The first excitation frequency is detuned by 0.59 GHz from the intermediate 2P_3/2 state. Two counter-propagating laser beams are used. The resonances are studied on two-photon transitions 2S_1/2 − nl in a range of principal quantum...

article

Quasi-isentropic compressibility of a strongly nonideal deuterium plasma at pressures of up to 5500 GPa: Nonideality and degeneracy effects

M. A. Mochalov, R. I. Il’kaev, V. E. Fortov, A. L. Mikhailov, more

Journal of Experimental and Theoretical Physics > 2017 > 124 > 3 > 505-529

We report on the experimental results on the quasi-isentropic compressibility of a strongly nonideal deuterium plasma that have been obtained on setups of cylindrical and spherical geometries in the pressure range of up to P ≈ 5500 GPa. We describe the characteristics of experimental setups, as well as the methods for the diagnostics and interpretation of the experimental results. The trajectory of...

article

Coulomb scatter of diamagnetic dust particles in a cusp magnetic trap under microgravity conditions

M. I. Myasnikov, L. G. D’yachkov, O. F. Petrov, M. M. Vasiliev, more

Journal of Experimental and Theoretical Physics > 2017 > 124 > 2 > 318-324

The effect of a dc electric field on strongly nonideal Coulomb systems consisting of a large number (~10⁴) of charged diamagnetic dust particles in a cusp magnetic trap are carried out aboard the Russian segment of the International Space Station (ISS) within the Coulomb Crystal experiment. Graphite particles of 100–400 μm in size are used in the experiments. Coulomb scatter of a dust cluster and...

chapter

Nozzle start flow investigation in the conditions of high-altitude test

V. V. Volodin, T. V. Bazhenova, V. E. Fortov, V. V. Golub, more

Shock Waves > Supersonic and Hypersonic Aerodynamics > 245-250

Rocket engines for future-technology vehicles development requires special ground-based test facilities to simulate the conditions at high altitude. The unsteady flow phenomena in the nozzle during starting process can cause the dangerous loads on the nozzles. The real propulsion engines high-altitude tests in the vacuum chamber are very expensive due to the huge vacuum chamber should be used. Usually...

article

The Sources of Pulse Current Based on Explosive Magnetic Generators for Mobile Testing Facility

A. V. Shurupov, A. V. Koslov, M. A. Shurupov, V. E. Zavalova, more

IEEE Transactions on Plasma Science > 2016 > 44 > 10-1 > 1956 - 1960

This paper demonstrates the practical application of the explosive magnetic generator (EMG) as a source of high-power pulses for mobile testing complex EMG (MTC EMG). Hereinafter, the name of explosion generator is used on a par with the name of helical explosion-magnetic generator. Laboratory sample was brought to a level of modern complex, which is able to solve the applied problems in the grid...

article

Complex Plasma Research under Microgravity Conditions: PK‐3 Plus Laboratory on the International Space Station

A. G. Khrapak, V. I. Molotkov, A. M. Lipaev, D. I. Zhukhovitskii, more

Contributions to Plasma Physics > 56 > 3‐4 > 253 - 262

Complex (dusty) plasmas are composed of weakly ionised gas and charged microparticles and represent the plasma state of soft matter. Due to the “heavy” component – the microparticles – and the low density of the surrounding medium, the rarefied gas and plasma, it is necessary to perform experiments under microgravity conditions to cover a broad range of experimental parameters which are not available...

article

Path Integral Representation of the Wigner Function in Canonical Ensemble

A. S. Larkin, V. S. Filinov, V. E. Fortov

Contributions to Plasma Physics > 56 > 3‐4 > 187 - 196

Quantum effects can affect the shape of the particle kinetic energy distribution function, as the interaction of a particle with its surroundings restricts the volume of configuration space, which, due to the uncertainty relation, results in an increase in the volume of the momentum space, i.e., in a rise in the fraction of particles with higher momenta. Allowing for quantum effects at calculations...