I. V. Romanov

Moscow Engineering Physics Institute

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Yu. V. Korobkin

MIREA - Russian Technological University

A. A. Rupasov

P.N. Lebedev Physical Institute of the Russian Academy of Sciences

V. L. Paperny

Irkutsk State University

A. S. Shikanov

P.N. Lebedev Physical Institute of the Russian Academy of Sciences

A. Moorti

Raja Ramanna Centre for Advanced Technology

P. A. Naik

University of Liverpool

P. D. Gupta

Raja Ramanna Centre for Advanced Technology

A. A. Kologrivov

P.N. Lebedev Physical Institute of the Russian Academy of Sciences

I. P. Tsygvintsev

Keldysh Institute of Applied Mathematics

S. R. Kumbhare

Raja Ramanna Centre for Advanced Technology

Cooperative Institutions

Joint Institute for Nuclear Research

168

P.N. Lebedev Physical Institute of the Russian Academy of Sciences

Moscow Engineering Physics Institute

Dubna State University

Russian Academy of Sciences

European Organization for Nuclear Research

Institute for Nuclear Research

Lomonosov Moscow State University

Kurchatov Institute

A. Alikhanyan National Laboratory

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Elongated long-lived jet of dense plasma produced by a hollow laser beam

Physics of Plasmas (2021)

I. P. Tsygvintsev I. V. Romanov V. L. Paperny

Numerical simulation of the dynamics of plasma jets planned for use for the initiation of vacuum pinch discharges has been carried out. Jets of the “laser-metal-plasma-liner” type are created by laser beams with different spatial intensity distributions, which irradiate targets of various configurations. The three variants of plasma-jets formation are considered: irradiation of a target by (i) a Gaussian beam from a neodymium laser, (ii) the same Gaussian beam incident on a hole in the target, and (iii) a beam with the intensity distribution of the Laguerre–Gaussian mode. The dynamics of spatial distributions of the electron density, jet plasma temperatures, and the target mass ablated by laser radiation is calculated. It is shown that for quite moderate laser beam energies and intensities ∼400 mJ and ∼109 W/cm2, respectively, in the second and third cases, jets are produced with the lifetime of a few tens of nanoseconds and the maximum density ∼1019 and 1021 cm−3, respectively. The use of such jets can increase the pinching efficiency and improve plasma parameters in laser-induced discharges.

10.1063/5.0036900

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Citations (2)

Measurement of the Charge Carrier Mobility in MEH-PPV and MEH-PPV-POSS Organic Semiconductor Films

Russian Physics Journal (2015)

I. V. Romanov А. В. Войцеховский K. M. Dyagterenko T. N. Kopylova А. П. Коханенко

Charge carrier

Organic semiconductor

Electron Mobility

Carrier lifetime

10.1007/s11182-015-0422-z

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Citations (6)

Stationary setup for identifying explosives using the tagged neutron method

Physics of Particles and Nuclei Letters (2013)

V. M. Bystritsky N. I. Zamyatin E. Zubarev V. Rapatsky Yu. N. Rogov

Neutron generator

Particle identification

Neutron Detection

Identification

10.1134/s1547477113050051

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Citations (12)

On the Features of X-Ray Emission of a Laser-Plasma Diode

Russian Physics Journal (2016)

Yu. V. Korobkin I. V. Romanov A. S. Shikanov

10.1007/s11182-016-0854-0

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Upgrading of the beam diagnostic system of U-70 beam transfer lines

arXiv (Cornell University) (2001)

V. Kovaltsov A. Loukiantsev A. A. Matyushin V. P. Milyutkin I. V. Romanov

The beam diagnostic system of U-70 beam transfer lines (beam profiles, intensity and beam losses measurements) was designed in the beginning of 80-th on the base of 8-bit microprocessor, SUMMA hardware and home made serial communication link. Because of the maintenance problems the decision was taken to upgrade the hardware and software parts of the system.

Upgrade

Microprocessor

10.48550/arxiv.physics/0111080

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Formation and decay of micropinch in a laser initiated vacuum spark

I. V. Romanov Yu. V. Korobkin V. L. Paperny A. A. Rupasov A. S. Shikanov

Results of experimental studies of the development and decay of a micropinch produced in a laser-induced vacuum spark are presented. The studies were performed with X-ray pinhole frame camera supplied with a micro-channel plate as a photocathode and the following visualization of the image by a luminous screen. The pinhole was covered with an Al foil of 0.8 micrometer thick that transmitted the X-ray emission in the range of 15-84 eV. The experiments were performed with the initiating laser pulse energy in the range of 0.5-200 mJ at the discharge voltage of 4, 8, 15 kV. It was found that process of the cathodic plasma jet pinching at the specified discharge current was governed just the mass of the laser produced plasma. It was shown also that dependence of the pinch position distance from the cathode against the laser pulse energy has a power-low dependence L ~ J ^α where the index α increases with the discharge voltage and ranged from 0.26 to 0.35.

Pinhole camera

Photocathode

Pinhole (optics)

Plasma channel

10.1109/deiv.2014.6961744

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Influence of the laser plasma-expansion specific on a cathode jet formation and the current stability in a laser-ignited vacuum discharge

Physics of Plasmas (2018)

I. V. Romanov I. P. Tsygvintsev V. L. Paperny A. A. Kologrivov Yu. V. Korobkin

The formation of a current-plasma shell is studied during the expansion of a laser-ignited low-power vacuum-discharge cathode plasma jet into the interelectrode gap. The shell geometry is found to be determined by the mode of laser-plasma expansion at the discharge ignition stage. It is shown that the increase in the laser-beam focal spot area on the cathode surface leads to the increase in the matter density and the decrease in the density gradient in the discharge gap and to transition from the spherical laser-plasma expansion mode to the jet mode. The latter considerably stabilizes the current transfer in the discharge plasma, even during the development of the hydrodynamic sausage instability in it.

10.1063/1.5037001

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Citations (10)

Characteristics of moderate current vacuum discharge triggered by multipicosecond and nanosecond duration laser pulses

Journal of Applied Physics (2005)

A. Moorti S. R. Kumbhare P. A. Naik P. D. Gupta I. V. Romanov

A comparative study of the characteristics of moderate-current (∼10kA), low-energy (⩽20J) vacuum discharge triggered by multipicosecond and nanosecond duration laser pulses is performed. Temporal profiles of the x-ray emission, discharge current, and anode voltage measured in vacuum discharge created between a planar titanium cathode and a conical point-tip anode are observed to be quite different for the two regimes of the laser pulse duration. While cathode plasma jet pinching is clearly observed in the discharge created by low-energy (∼5mJ), 27 ps full width at half-maximum (FWHM) laser pulses, a feeble pinching occurred for 4 ns (FWHM) laser pulses only above a threshold energy of ∼250mJ. In addition to the multiple K-shell x-ray pulses emitted from the titanium anode up to 100 ns, evidence of a much harder x-ray component (hν>100keV) is also seen in the discharge triggered by picosecond laser pulses.

Nanosecond

Picosecond

Pulse duration

10.1063/1.1848189

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Citations (7)

Observation of micropinch formation in cathode jet of a low-power laser-induced vacuum discharge

Physics of Plasmas (2016)

I. V. Romanov V. L. Paperny Yu. V. Korobkin V. A. Podviaznikov A. A. Rupasov

The report presents the results from experimental investigation of micropinch formation in the plasma of a vacuum discharge induced by a 6 ns laser pulse of energy J = 0.5–200 mJ (at a storage voltage from 4 to 15 kV and the discharge current range of 6–26 kA, respectively). The discharge gap images were obtained using a pinhole camera in the EUV and soft X-ray ranges of 15–73 eV and 80–284 eV energy. It is shown that micropinch formation in the plasma cathode jet occurs, mainly, in the matter evaporated by the laser pulse at the discharge ignition near the moment when the current derivative reaches the maximum. It is found that the cathode jet may consist of several pinched areas, and each of them has its own structure, and the improvement of the discharge and laser radiation parameters allows us to reach a stable single pinching of plasma. The parameters of the micropinch (the plasma compression ratio, size, and position of the emitting area in the interelectrode gap) as well as the current flow through the interelectrode gap, at the given storage voltage, are completely governed by the laser radiation characteristics.

Pinhole camera

10.1063/1.4942029

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Citations (15)

Formation of a cathode plasma jet in a laser-induced vacuum discharge

Technical Physics Letters (2016)

I. V. Romanov V. L. Paperny Yu. V. Korobkin V. A. Podvyaznikov A. A. Rupasov

10.1134/s1063785016020127

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Citations (4)