Pub Date : 2024-03-01DOI: 10.1134/s1028335823120054
L. V. Kovtanyuk
Abstract
With the use of a mathematical model of large deformations of materials with elastic, plastic, and viscous properties, an analytical solution was obtained for deformation under creep conditions of a plug in a round tube with a varying pressure drop. The motion is considered taking into account the sliding of the material in the vicinity of the rigid wall of the pipe and its deformation under increasing, constant, and decreasing pressure. The displacements, reversible and irreversible deformations, and stresses at all stages of deformation, including residual deformations and stresses at full unloading, are calculated.
{"title":"Analytical Solution to the Creep Problem of a Viscoelastic Material in a Round Tube","authors":"L. V. Kovtanyuk","doi":"10.1134/s1028335823120054","DOIUrl":"https://doi.org/10.1134/s1028335823120054","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>With the use of a mathematical model of large deformations of materials with elastic, plastic, and viscous properties, an analytical solution was obtained for deformation under creep conditions of a plug in a round tube with a varying pressure drop. The motion is considered taking into account the sliding of the material in the vicinity of the rigid wall of the pipe and its deformation under increasing, constant, and decreasing pressure. The displacements, reversible and irreversible deformations, and stresses at all stages of deformation, including residual deformations and stresses at full unloading, are calculated.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1134/s1028335823110046
V. M. Chudnovskii, M. A. Guzev, E. P. Dats, A. V. Kulik
Abstract
The expansion and collapse of a cavitation bubble during laser heating and subcooled boiling of water in the vicinity of the tip of an optical fiber (laser heating element) installed in a water-filled glass tube with two open ends is studied experimentally and numerically. Cavitation, initiated by continuous laser radiation, is accompanied by the pushing and pulling movement of the heated liquid in the tube and outside it. For the first time, it has been shown that in a tube with an installed laser heating element in a liquid flow moving behind the walls of the bubble, when it collapses at the pole of the bubble surface remote from the end, a liquid jet appears, directed through the bubble to the end of the optical fiber. The jet speeds up the process of sucking liquid into the tube.
{"title":"The Effect of Accelerated Absorption of Liquid in a Tube during Laser Cavitation on a Laser Heating Element","authors":"V. M. Chudnovskii, M. A. Guzev, E. P. Dats, A. V. Kulik","doi":"10.1134/s1028335823110046","DOIUrl":"https://doi.org/10.1134/s1028335823110046","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The expansion and collapse of a cavitation bubble during laser heating and subcooled boiling of water in the vicinity of the tip of an optical fiber (laser heating element) installed in a water-filled glass tube with two open ends is studied experimentally and numerically. Cavitation, initiated by continuous laser radiation, is accompanied by the pushing and pulling movement of the heated liquid in the tube and outside it. For the first time, it has been shown that in a tube with an installed laser heating element in a liquid flow moving behind the walls of the bubble, when it collapses at the pole of the bubble surface remote from the end, a liquid jet appears, directed through the bubble to the end of the optical fiber. The jet speeds up the process of sucking liquid into the tube.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1134/s1028335823120030
I. V. Govorun, B. A. Belyaev, Ya. B. Zav’yalov, T. Y. Shumilov, A. O. Afonin, A. V. Ugryumov, R. G. Galeev
Abstract
The monolithic design of a compact bandpass filter X-band is made on the technology of multilayered printed circuit boards. Quarter-wave stripline resonators of the filter have two conductors divided by a layer of prepreg having low parameters that bond together the design. This eliminates the influence of the prepreg on the characteristics of the devices, ensuring good repeatability of filters in mass production. To increase the high-frequency stopband of the filter, one of the conductors of each resonator is cut in half by a transverse slit. The constructive sizes of the device were obtained by parametric synthesis using the electrodynamic analysis of its 3D model. The experimental data of the five-order filter are in good agreement with the electromagnetic simulation of filter of the 3D model. The experimental device has a central frequency of the passband of 10 GHz and a fractional bandwidth of 5.7%, and its dimensions and weight are 18.0 × 5.4 × 2.1 mm3 and 0.5 g. The important advantage of the developed design is the possibility of its installation on the board using the surface mounting method.
{"title":"A 10 GHz Monolithic Filter Based on Stripline Resonators with a Split Conductor","authors":"I. V. Govorun, B. A. Belyaev, Ya. B. Zav’yalov, T. Y. Shumilov, A. O. Afonin, A. V. Ugryumov, R. G. Galeev","doi":"10.1134/s1028335823120030","DOIUrl":"https://doi.org/10.1134/s1028335823120030","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The monolithic design of a compact bandpass filter X-band is made on the technology of multilayered printed circuit boards. Quarter-wave stripline resonators of the filter have two conductors divided by a layer of prepreg having low parameters that bond together the design. This eliminates the influence of the prepreg on the characteristics of the devices, ensuring good repeatability of filters in mass production. To increase the high-frequency stopband of the filter, one of the conductors of each resonator is cut in half by a transverse slit. The constructive sizes of the device were obtained by parametric synthesis using the electrodynamic analysis of its 3D model. The experimental data of the five-order filter are in good agreement with the electromagnetic simulation of filter of the 3D model. The experimental device has a central frequency of the passband of 10 GHz and a fractional bandwidth of 5.7%, and its dimensions and weight are 18.0 × 5.4 × 2.1 mm<sup>3</sup> and 0.5 g. The important advantage of the developed design is the possibility of its installation on the board using the surface mounting method.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1134/s1028335823120029
S. G. Garanin, V. N. Derkach, K. N. Makarov, V. A. Ostrovsky, M. I. Pergament, M. V. Putilin, D. V. Sizmin
Abstract
The current trends in the creation of high-energy repetitively pulsed continuous wave lasers with pulse energies of tens and hundreds of joules are considered. Active media are analyzed for their use in such lasers. The Yb:YAG active crystalline and ceramic elements produced in Russia are experimentally studied at temperatures from 100 to 295 K. The data of the cryogenic cooling system for active elements are presented. A diode pumping system for active elements and a homogenizer for its emission are described. The physical and technical characteristics of the pumping system are given. Fresnel losses, absorption losses, and losses due to enhanced spontaneous emission, which reduce the energy stored in the inverse population, are measured experimentally. The results of measuring the gain in multi-pass circuits with different sets of active elements are presented.
摘要 研究了当前制造脉冲能量为几十或几百焦耳的高能重复脉冲连续波激光器的趋势。分析了在此类激光器中使用的有源介质。对俄罗斯生产的掺镱钇钕石榴石（Yb:YAG）有源晶体和陶瓷元件在 100 至 295 K 的温度下进行了实验研究。介绍了用于活性元素的二极管泵系统和用于其发射的均质器。介绍了泵送系统的物理和技术特性。通过实验测量了菲涅尔损耗、吸收损耗和自发辐射增强导致的损耗，这些损耗降低了反向群体中存储的能量。此外，还介绍了在具有不同有源元件组的多通电路中测量增益的结果。
{"title":"Current Trends in the Creation of High-Energy Repetitively Pulsed Continuous Wave Lasers","authors":"S. G. Garanin, V. N. Derkach, K. N. Makarov, V. A. Ostrovsky, M. I. Pergament, M. V. Putilin, D. V. Sizmin","doi":"10.1134/s1028335823120029","DOIUrl":"https://doi.org/10.1134/s1028335823120029","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The current trends in the creation of high-energy repetitively pulsed continuous wave lasers with pulse energies of tens and hundreds of joules are considered. Active media are analyzed for their use in such lasers. The Yb:YAG active crystalline and ceramic elements produced in Russia are experimentally studied at temperatures from 100 to 295 K. The data of the cryogenic cooling system for active elements are presented. A diode pumping system for active elements and a homogenizer for its emission are described. The physical and technical characteristics of the pumping system are given. Fresnel losses, absorption losses, and losses due to enhanced spontaneous emission, which reduce the energy stored in the inverse population, are measured experimentally. The results of measuring the gain in multi-pass circuits with different sets of active elements are presented.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1134/s1028335823110058
V. I. Kolesnikov, V. B. Yakovlev, I. V. Lavrov, A. P. Sychev, A. V. Bardushkin
Abstract
Expressions are obtained for operators of the concentration of the electric field strength and displacement on the surface of inclusions in a matrix composite depending on the shape and volume fraction of inclusions in the material. These operators relate the fields on the inclusion surface on the matrix side with the average values of the electric field strength and displacement in the composite sample.
{"title":"Distribution of Electric Fields on the Surface of Inclusions in a Matrix Composite","authors":"V. I. Kolesnikov, V. B. Yakovlev, I. V. Lavrov, A. P. Sychev, A. V. Bardushkin","doi":"10.1134/s1028335823110058","DOIUrl":"https://doi.org/10.1134/s1028335823110058","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Expressions are obtained for operators of the concentration of the electric field strength and displacement on the surface of inclusions in a matrix composite depending on the shape and volume fraction of inclusions in the material. These operators relate the fields on the inclusion surface on the matrix side with the average values of the electric field strength and displacement in the composite sample.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1134/s1028335823120066
V. V. Kozlov, A. V. Dovgal, M. V. Litvinenko, Yu. A. Litvinenko, A. G. Shmakov
Abstract—
In this paper, we examine the combustion of a hydrogen microjet outflowing from a curved channel with a round micronozzle. Jet flows that are generated using rectilinear and curved channels differ in that, in the second case, Dean vortices make a noticeable contribution to the formation of the jet and its combustion. The interaction of the latter with Kelvin–Helmholtz vortices, the formation of which is typical for flows with a velocity shift, causes changes in the combustion characteristics. They include spatial distortions of the laminar flame zone near the nozzle exit, the area of turbulent combustion downstream, as well as the turbulent flame under the conditions of its separation from the nozzle exit and the cessation of laminar combustion in the initial section of the flow. The results of these studies provide the possibility to understand better the combustion features of hydrogen microjets under conditions of their hydrodynamic instability.
{"title":"Diffusion Combustion of Hydrogen in a Microjet Outflowing from a Curvilinear Channel","authors":"V. V. Kozlov, A. V. Dovgal, M. V. Litvinenko, Yu. A. Litvinenko, A. G. Shmakov","doi":"10.1134/s1028335823120066","DOIUrl":"https://doi.org/10.1134/s1028335823120066","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract—</h3><p>In this paper, we examine the combustion of a hydrogen microjet outflowing from a curved channel with a round micronozzle. Jet flows that are generated using rectilinear and curved channels differ in that, in the second case, Dean vortices make a noticeable contribution to the formation of the jet and its combustion. The interaction of the latter with Kelvin–Helmholtz vortices, the formation of which is typical for flows with a velocity shift, causes changes in the combustion characteristics. They include spatial distortions of the laminar flame zone near the nozzle exit, the area of turbulent combustion downstream, as well as the turbulent flame under the conditions of its separation from the nozzle exit and the cessation of laminar combustion in the initial section of the flow. The results of these studies provide the possibility to understand better the combustion features of hydrogen microjets under conditions of their hydrodynamic instability.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1134/s102833582311006x
M. D. Kovalenko, A. P. Kerzhaev, I. V. Menshova, Yu. N. Karnet
Abstract
A method is proposed for building exact solutions to boundary value problems of the theory of elasticity in a rectangle with stiffeners located inside a region (the inhomogeneous problem). The solutions are presented as series in Papkovich–Fadle eigenfunctions with explicitly determined coefficients. The method is based on the Papkovich orthogonality relation and the developed theory of expansions in the Papkovich–Fadle eigenfunctions in homogeneous boundary value problems of the theory of elasticity in a rectangle (the biharmonic problem). The solution sequence is demonstrated by the example of an even symmetric problem for a rectangle in which the sides are free and an external load acts along a stiffener located on the axis of symmetry of the rectangle.
{"title":"Exact Solutions to Inhomogeneous Boundary Value Problems of the Theory of Elasticity in a Rectangle","authors":"M. D. Kovalenko, A. P. Kerzhaev, I. V. Menshova, Yu. N. Karnet","doi":"10.1134/s102833582311006x","DOIUrl":"https://doi.org/10.1134/s102833582311006x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A method is proposed for building exact solutions to boundary value problems of the theory of elasticity in a rectangle with stiffeners located inside a region (the inhomogeneous problem). The solutions are presented as series in Papkovich–Fadle eigenfunctions with explicitly determined coefficients. The method is based on the Papkovich orthogonality relation and the developed theory of expansions in the Papkovich–Fadle eigenfunctions in homogeneous boundary value problems of the theory of elasticity in a rectangle (the biharmonic problem). The solution sequence is demonstrated by the example of an even symmetric problem for a rectangle in which the sides are free and an external load acts along a stiffener located on the axis of symmetry of the rectangle.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1134/s1028335823110022
Yu. D. Chashechkin, A. A. Ochirov
Abstract
The complete dispersion relations for periodic perturbations of a flat free surface with a positive definite frequency and a complex wavenumber describing spatial attenuation in a viscous stratified charged liquid were obtained in a linear approximation by methods of the theory of singular perturbations for the first time. Regular components of the complete solution describe plane gravitational-capillary waves. Singular components characterize ligaments, i.e., thin flows that are absent in the model of an ideal medium. The obtained dispersion relations in extreme cases uniformly transform into known expressions for inviscid stratified, viscous homogeneous and ideal liquids. The calculated dependencies of the wavelength and thickness of the ligament and the group and phase velocity of the components on the frequency at different values of the media parameters are given.
{"title":"A Free Surface Fluid with Two-Dimensional Periodic Disturbances in Various Models of the Fluid","authors":"Yu. D. Chashechkin, A. A. Ochirov","doi":"10.1134/s1028335823110022","DOIUrl":"https://doi.org/10.1134/s1028335823110022","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The complete dispersion relations for periodic perturbations of a flat free surface with a positive definite frequency and a complex wavenumber describing spatial attenuation in a viscous stratified charged liquid were obtained in a linear approximation by methods of the theory of singular perturbations for the first time. Regular components of the complete solution describe plane gravitational-capillary waves. Singular components characterize ligaments, i.e., thin flows that are absent in the model of an ideal medium. The obtained dispersion relations in extreme cases uniformly transform into known expressions for inviscid stratified, viscous homogeneous and ideal liquids. The calculated dependencies of the wavelength and thickness of the ligament and the group and phase velocity of the components on the frequency at different values of the media parameters are given.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1134/s1028335823120042
V. N. Grebenev, A. N. Grishkov
Abstract
The geometric methods for Yang–Mills fields of gauge transformations are applied to find an invariant Lagrangian in the fiber bundle of the configuration of 2d space X of a turbulent flow determined by the n-point probability density function (PDF) fn. The two-dimensional wave optical turbulence is considered in the case of an inverse cascade of turbulence energy transfer under external impacts in the form of white Gaussian noise and large-scale friction. The n-point PDF of the vorticity field satisfies the fn-equation from the Lundgren–Monin–Novikov hierarchy, and the conditions of equation invariance under external action are found. A Lagrangian, which is invariant relative to the (H subset G) subgroup (a group of the gauge transformations in the fiber bundle of the space X), and the conserved currents are constructed.
摘要 应用杨-米尔斯场的规整变换几何方法，在由n点概率密度函数（PDF）fn决定的湍流的二维空间X构型的纤维束中寻找不变拉格朗日。在白高斯噪声和大尺度摩擦形式的外部冲击下，二维波光学湍流被视为湍流能量传递的反级联情况。涡度场的 n 点 PDF 满足 Lundgren-Monin-Novikov 层次中的 fn-方程，并找到了外部作用下方程不变性的条件。构建了相对于 (H subset G) 子群（空间 X 纤维束中的轨距变换群）不变的拉格朗日和守恒电流。
{"title":"A Gauge-Invariant Lagrangian Determined by the n-Point Probability Density Function of a Vorticity Field of Wave Optical Turbulence","authors":"V. N. Grebenev, A. N. Grishkov","doi":"10.1134/s1028335823120042","DOIUrl":"https://doi.org/10.1134/s1028335823120042","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The geometric methods for Yang–Mills fields of gauge transformations are applied to find an invariant Lagrangian in the fiber bundle of the configuration of 2<i>d</i> space <i>X</i> of a turbulent flow determined by the <i>n</i>-point probability density function (PDF) <i>f</i><sub><i>n</i></sub>. The two-dimensional wave optical turbulence is considered in the case of an inverse cascade of turbulence energy transfer under external impacts in the form of white Gaussian noise and large-scale friction. The <i>n</i>-point PDF of the vorticity field satisfies the <i>f</i><sub><i>n</i></sub>-equation from the Lundgren–Monin–Novikov hierarchy, and the conditions of equation invariance under external action are found. A Lagrangian, which is invariant relative to the <span>(H subset G)</span> subgroup (a group of the gauge transformations in the fiber bundle of the space <i>X</i>), and the conserved currents are constructed.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1134/s1028335823110083
S. V. Garnov, V. V. Bulgakova, T. V. Dolmatov, A. A. Ushakov, V. V. Bukin
Abstract
A method for generation of ultra-wideband electromagnetic pulses with a nanosecond length and a picosecond rise time has been proposed and studied. A horn antenna with a photoconductive switch irradiated by laser pulses has been used as an emitter. It is shown that the length of ultra-wideband electromagnetic pulses is determined by the antenna length and the semiconductor material and the rise front is determined by the front of laser pulses used to initiate a photoconductive switch. Typical pulse lengths of ~1 ns with a rise front of up to ~34 ps are reported.
{"title":"Generation of Rectangular Nanosecond Electromagnetic Pulses with a Picosecond Rise Front","authors":"S. V. Garnov, V. V. Bulgakova, T. V. Dolmatov, A. A. Ushakov, V. V. Bukin","doi":"10.1134/s1028335823110083","DOIUrl":"https://doi.org/10.1134/s1028335823110083","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A method for generation of ultra-wideband electromagnetic pulses with a nanosecond length and a picosecond rise time has been proposed and studied. A horn antenna with a photoconductive switch irradiated by laser pulses has been used as an emitter. It is shown that the length of ultra-wideband electromagnetic pulses is determined by the antenna length and the semiconductor material and the rise front is determined by the front of laser pulses used to initiate a photoconductive switch. Typical pulse lengths of ~1 ns with a rise front of up to ~34 ps are reported.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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