High-power lasers and their applications in high-energy-density physics studies

Гаранин, С. Г.

doi:10.3367/ufne.0181.201104m.0434

Cited by 46 publications

(15 citation statements)

References 53 publications

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“…Therefore, the features of the kinetics of fast electrons in such targets have a general nature. These features are discussed in this paper in relation to the baseline target [11] designed for irradiation conditions expected for the megajoule laser facility of the Russian project [12]. These conditions suggest the action of a profiled pulse with the energy 2.6 MJ of the 2nd harmonic of Nd-laser radiation.…”

Section: Problem Statement: Dynamics Of Target's Implosion and Charac...mentioning

confidence: 98%

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Effect of ‘wandering’ and other features of energy transfer by fast electrons in a direct-drive inertial confinement fusion target

Gus’kov

Kuchugov

Yakhin

et al. 2019

Plasma Phys. Control. Fusion

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The heating of inertial confinement fusion (ICF) target by fast electrons, which are generated as a result of laser interaction with expanding plasma (corona) of a target, is investigated theoretically. It is shown that due to remoteness of the peripheral region, where electrons are accelerated, a significant portion of these particles, moving in corona and repeatedly crossing it due to reflection in a self-consistent electric field, will not hit into the compressed part of target. Using the modern models of fast electron generation, it is shown that in a typical target designed for spark ignition, the fraction of fast electrons that can pass their energy to compressed part of target is enough small. Only 12% of the total number of fast electrons can do it. Such an effect of "wandering" of fast electrons in corona leads to a significant decrease in a negative effect of fast electrons on target compression. Taking into account the wandering effect, the distribution of energy transmitted by fast electrons to different parts of target and the resulting reduction of deuterium-tritium (DT) fuel compression are established.

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Section: Problem Statement: Dynamics Of Target's Implosion and Charac...mentioning

confidence: 98%

“…where the energy E 3 (t) is given by the expression (14); the value of areal density ρr 2 = 2.5 • 10 −3 g/cm 2 does not change in time (see (12)); the mass range of fast electron in the region 2 after its partial slowing down in the region 3, according to (8), is given by…”

Section: Energy Transmission From Fast Electronsmentioning

confidence: 99%

Effect of ‘wandering’ and other features of energy transfer by fast electrons in a direct-drive inertial confinement fusion target

Gus’kov

Kuchugov

Yakhin

et al. 2019

Plasma Phys. Control. Fusion

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“…Thanks to record energy flux density, which can be provided by laser beam action, the laser methods for generating a shock wave are the most effective way to generate a powerful shock wave in laboratory experiment under the conditions of a moratorium on nuclear testing. Right now laser methods are the most effective tool for generating a plane shock wave for EOS study at the level of pressure up to 100 Mbar [9,10]. It should be noted that the plane shock wave EOS-experiment is much simpler and less costly tool in comparison with spherical one.…”

Section: Jinst 11 C03049mentioning

confidence: 99%

“…Thus, the energy of a laser pulse in the case of the Maxwell spectrum of fast electrons necessary for the generation of gigabar shock wave for EOS experiment increases by an order of magnitude: to 90 and 30 kJ for the first and third harmonics radiation of Nd-laser pulse, respectively. Nevertheless, these energies are significantly less than the energies of the largest operating [5] and created [10,25] megajoule facilities for ICF research.…”

Section: Gigabar Shock Wave Driven By Laser Accelerated Fast Electronmentioning

confidence: 99%

Gigabar shock wave in a laboratory experiment

Gus'kov

2016

J. Inst.

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The current status of research on generating a powerful shock wave with a pressure of up to several gigabars in a laboratory experiment is reviewed. The focus is on results which give a possibility of shock-wave experiments to study an equation of state of matter (EOS) at the level of gigabar pressure. The proposals are discussed to achieve a plane record-pressure shock wave driven by laser-accelerated fast electrons with respect to EOS-experiment as well as to prospective method of inertial fusion target (ICF) ignition as shock ignition.

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“…Whatever laser medium may be used, its spectral gain bandwidth must be as broad as possible to obtain the shortest final laser pulse; this fact is the basis for the chirped pulse amplification (CPA) technique first demonstrated in 1985 [1]. Several years later [2] the OPCPA technique made it possible to use lasers with a very narrow spectral bandwidth, such as the iodine photo-dissociation laser [3][4][5][6][7][8][9], the bandwidth of which at 1315 nm is λ ∼ 0.02 nm.…”

Section: Introductionmentioning

confidence: 99%

Mismatch characteristics of optical parametric chirped pulse amplification

Novák¹,

Turčičová²,

Divoký³

et al. 2013

Laser Phys. Lett.

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The stability of an optical parametric chirped pulse amplifier (OPCPA) is influenced by time and the angular matching of the input beams. We derived the Gaussian dependence of the monochromatic signal gain on the small mismatch between the signal and pump beams. Gain characteristics were also calculated for polychromatic amplification and the impact of different beam mismatches and interaction geometries was explained. The asymmetry of the energy gain, and the square root dependence of the phase matched wavelength on beam angles were found. The predicted dependences were verified in a noncollinear OPCPA system with LBO and KDP crystal amplifying pulses of a Ti:sapphire laser around a central wavelength of 800 nm, pumped by the third harmonic frequency of an iodine gas laser at a wavelength of 438 nm. The widths of the gain curves in the dependence on both the pump-signal or the phase matching angles varied from several tenths to a few milliradians. The gain curve widths dependent on the pump-signal pulse delay were about two thirds of the pump pulse width for moderate pumping and about a half of the pump pulse width for pumping on the order of GW cm −2 . A stable gain output is achieved if angular and temporal fluctuations are fractions of the measured gain curve widths, and when the signal direction is between the pump and the crystal principal axis (i.e. in the psz geometry).

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High-power lasers and their applications in high-energy-density physics studies

Cited by 46 publications

References 53 publications

Effect of ‘wandering’ and other features of energy transfer by fast electrons in a direct-drive inertial confinement fusion target

Effect of ‘wandering’ and other features of energy transfer by fast electrons in a direct-drive inertial confinement fusion target

Gigabar shock wave in a laboratory experiment

Mismatch characteristics of optical parametric chirped pulse amplification

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