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Diffuse discharges in SF_(6)and mixtures of SF_(6)with H_(2),formed by nanosecond voltage pulses in non-uniform electric field

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High Voltage 2018年第4期3卷 316-322页

作者： Alexei N.Panchenko Victor F.Tarasenko Dmitry V.Beloplotov Nikolay A.Panchenko mikhail i.lomaev institute of High Current Electronics Siberian Branch(SB)Russian Academy of Sciences(RAS)Tomsk 634055Russia Faculty of innovative Technologies National Research Tomsk State UniversityTomsk 634050Russia Department of Photonics and Quantum Electronics National Research Tomsk Polytechnic UniversityTomsk 634050Russia Department of Physics Tomsk State University of Control Systems and RadioelectronicsTomsk 634050Russia

Results of experimental study of nanosecond diffuse discharge in SF_(6)and gas mixtures of SF_(6)with H_(2),D_(2)and C_(2)H_(6)are presented.The aim of this work is to study parameters of discharge between two extended electrodes with a small radius of curvature in SF_(6)and SF_(6)with additives.it was shown that diffuse discharge can be formed in SF_(6)at elevated pressure between blade electrodes with length of 30 cm.it was also confirmed that in a sharply non-uniform electric field a beam of runaway electrons is generated and that the gap breakdown occurs due to ionisation waves which begin on electrodes with small radius of curvature.Laser action in the infrared spectral region was obtained in SF_(6)-H_(2)(D_(2),C_(2)H_(6))mixtures.The laser output up to 110 mJ was easily achieved which corresponds to ultimate intrinsic efficiency(with respect to deposited energy)of 10%.

关键词： breakdown uniform radius

influence of electrode spacing and gas pressure on parameters of a runaway electron beam generating during the nanosecond breakdown in SF_(6) and nitrogen

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High Voltage 2017年第2期2卷 49-55页

作者： Victor F.Tarasenko Cheng Zhang Andrey V.Kozyrev Dmitry A.Sorokin Xingmin Hou Natalya S.Semeniuk Alexander G.Burachenko Ping Yan Vasily Yu.Kozhevnikov Evgenii Kh.Baksht mikhail i.lomaev Tao Shao institute of High Current Electronics Siberian Branch(SB)Russian Academy of Sciences(RAS)Tomsk 634055Russia National Research Tomsk State University Tomsk 634050Russia National Research Tomsk Polytechnic University Tomsk 634050Russia institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190People's Republic of China University of Chinese Academy of Sciences Beijing 100039People's Republic of China

This study deals with experimental and theoretical simulation data showing the influence of electrode spacing and gas pressure on parameters of a supershort avalanche electron beam(SAEB)formed in SF_(6) and nitrogen at different rise times and amplitudes of a voltage pulse.Using GiN-55-01,VPG-30-200,and SLEP-150M pulsers,tubular cathodes with a diameter of 6 mm,as well as gaps of 3,5,and 8 mm,it was shown that the SAEB current amplitude can both increase and decrease depending on an electrode spacing,a waveform and a rise time of the voltage pulse,as well as the pressure of SF6 and nitrogen.it was established as a result of simulation that maximal voltage across the gap during the process of generation of runaway electrons and the thickness of an anode foil have a major effect on the SAEB current pulse amplitude.

关键词： SF_(6) electrode beam

Neutrons in a nanosecond low-pressure discharge in deuterium

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Matter and Radiation at Extremes 2016年第4期1卷 207-212页

作者： Victor F.Tarasenko mikhail i.lomaev Dmitry A.Sorokin Boris A.Nechaev Vladimir N.Padalko Gennady N.Dudkin Laboratory of Optical Radiation of the institute of High Current Electronics SB RAS Tomsk 634055Russia Physical Technical institute National Research Tomsk Polytechnic UniversityTomsk 634050Russia National Research Tomsk State University Tomsk 634050Russia

Stable neutron generation with a yield of ~1.2×10^(4) neutrons per pulse was obtained during d(d,n)^(3)He reaction initiated by the high-voltage nanosecond discharge in a gap with a potential tungsten cylinder(anode)and a grounded deuterated zirconium plate(cathode)filled with deuterium at a pressure of ~10^(2) Pa.Estimated duration of the neutron pulse was ~1.5 ns.Less intensive neutron emission was registered without deuterated plate.Splashing of material of the tungsten electrode was observed during the high-voltage nanosecond discharge in the deuterium,hydrogen,helium and argon at pressures of 10^(2)-10^(4) Pa.

关键词： Neutrons Deuterium High-voltage nanosecond discharge Low-pressure Thermonuclear reaction

Review of supershort avalanche electron beam during nanosecond-pulse discharges in some gases

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Matter and Radiation at Extremes 2017年第3期2卷 105-116页

作者： Victor F.Tarasenko Cheng Zhang Evgenii Kh.Baksht Alexander G.Burachenko Tao Shao Dmitry V.Beloplotov mikhail i.lomaev Ping Yan Andrey V.Kozyrev Natalia S.Semeniuk Laboratory of Optical Radiation of the institute of High Current Electronics Tomsk 634055Russia National Research Tomsk State University Tomsk 634050Russia National Research Tomsk Polytechnic University Tomsk 634050Russia institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China

Supershort avalanche electron beam(SAEB)plays an important role in nanosecond-pulse discharges.This paper aims at reviewing ex-periments results on characteritics of SAEB and its spectra in different gases in nanosecond-pulse discharges.All the joint experiments were carried in the institute of High Current Electronics of the Russian Academy of Sciences and the institute of Electrical Engineering of the Chinese Academy of Sciences.in these experiments,the generation of a SAEB in SF 6 in an inhomogeneous electric field was studied on three generators with pulse rise times of 0.3,0.5 and~2 ns.Firstly,the comparison of SAEB parameters in SF 6 with those obtained in other gases(air,nitrogen,argon,and krypton)is introduced.Secondly,the SAEB spectra in SF 6 and air at pressures of 10 kPa(75 torr),and 0.1 MPa(750 torr)are reviewed and discussed.Finally,1.5-D theoretical simulation of the supershort pulse of the fast electron beam in a coaxial diode filled with SF 6 at atmospheric pressure is described.The simulation was carried out in the framework of hybrid model for discharge and runaway electron kinetics.The above research progress can provide better understanding of the investigation into the mechanism of nanosecond-pulse discharges.

关键词： Runaway electrons Supershort avalanche electron beam(SAEB) SF 6 Gas diode High pressure Simulation Hybrid model

Generation of Runaway Electrons in Atmospheric Pressure Air Under 30-200 kV Voltage Pulses of Rise Time 1.5 ns

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高电压技术 2013年第9期39卷 2112-2118页

作者： Sergey B. Alekseev mikhail i. lomaev Dmitry V. Rybka V. F. Tarasenko SHAO Tao ZHANG Cheng YAN Ping institute of High Current Electronics SB RAS Tomsk 634055 Russia Tomsk Polytechnic University Tomsk 634050 Russia institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China

A pulse generator with a voltage rise time of～1.5 ns and voltage amplitude variable from 30 kV to 200 kV was designed for generating runaway electron beams in atmospheric pressure air with different interelectrode gaps.The influence of the voltage amplitude and gap length on the generation was studied.in the gas diode geometry under study,the gap voltage at which the generation of a runaway electron beam begins was determined.Decreasing the voltage pulse amplitude does not increase the beam current pulse width measured with a time resolution of～0.1 ns.it is shown that the escape of beam electrons to the downstream of the foil is sync in time with the voltage drop across the gap,and that the delay of beam current generation increases gradually from 1.1 ns to 2.6 ns as the voltage pulse amplitude across the gap decreases from～100 kV to 40 kV.

关键词：脉冲上升时间电压幅值逃逸电子大气压力纳秒空气间隙电压脉冲幅度

Dynamic Characteristics in Subnanosecond Breakdown and Generation of Supershort Avalanche Electron Beam

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高电压技术 2013年第9期39卷 2207-2215页

作者： Victor F. Tarasenko SHAO Tao Dmitry V. Rybka ZHANG Cheng Alexandr G. Burachenko igor' D. Kostyrya mikhail i. lomaev Ping Yan Evgeni Kh. Baksht institute of High Current Electronics Russian Academy of Sciences Tomsk 634055 Russia institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China Key Laboratory of Power Electronics and Electric Drive Chinese Academy of Sciences Beijing 100190 China

in this paper,subnanosecond-pulse and one-nanosecond-pulse generators are used to study the breakdowns in highly overvolted gaps in atmospheric pressure air.With different cathodes,we measured the applied voltage and discharge current to investigate the dynamic characteristics in the subnanosecond breakdown during the generation of a supershort avalanche electron beam.Especially,characteristics of dynamic displacement current are presented in the current paper,which is detected between the ionization wave front and a plane anode.it is shown that during a subnanosecond voltage rise time,the amplitude of the dynamic displacement current can be higher than 4 kA.it is demonstrated that the breakdown in the air gap is assisted by ionization processes between the ionization wave front and a plane anode.

关键词：动力学特性亚纳秒电子束击穿雪崩超短纳秒脉冲发生器电离过程

Anode and Cathode Spots in High-Voltage Nanosecond-Pulse Discharge initiated by Runaway Electrons in Air

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Chinese Physics Letters 2014年第8期31卷 92-95页

作者：邵涛 VictorF.Tarasenko 杨文晋 DmitryV.Beloplotov 章程 mikhaili.lomaev 严萍 DmitryA.Sorokin instituteofElectricalEngineering ChineseAcademyofSciencesBeijing100190 KeyLaboratoryofPowerElectronicsandElectricDrive ChineseAcademyofSciencesBeijing100190 instituteofHighCurrentElectronics RussianAcademyofSciencesTomsk634055Russia NationalResearchTomskStateUniversity Tomsk634055Russia

We report the experimental results with nanosecond-pulse discharges formed in the air gap between a fiat electrode and a sharp electrode. The appearance of anode and cathode spots on the electrodes is studied experimentally. it is considered that bright spots on the fiat cathode with positive polarity of the sharp electrode are formed due to the explosive electron emission on the cathode and the dynamic displacement current in the gap. it is also shown that with negative polarity of the sharp electrode, bright spots on the flat anode are formed after changing the polarity of the flat electrode due to the discharge oscillatory mode. Under these conditions, the explosive electron emission firstly forms on the sharp cathode. With negative polarity of the sharp electrode of the subnanosecond-pulse pulser, the runaway electron beam current is measured behind the anode foil with a time resolution of no more than 100ps.

关键词： Cathodes

E-beam generation in discharges initiated by voltage pulses with a rise time of 200 ns at an air pressure of 12.5-100 kPa

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Plasma Science and Technology 2019年第4期21卷 52-60页

作者： Victor TARASENKO Dmitry BELOPLOTOV mikhail lomaev Dmitry SOROKiN institute of High Current Electronics Siberian Bran ch.Russian Academy of Sciences.Tomsk&34055.Russia National Research Tomsk State University.Tomsk 634050 Russia

The effect of air pressure(12.5,25,50,and 100 kPa)on the gen eration of runaway electron beams in a non-uniform electric field when applying voltage pulses(~35 kV)with a rise time of?200 ns has been studied.The results show that the discharge has various stages:streamer,diffuse,and spark.initially,a wide streamer develops in the gap and a diffuse discharge is formed.A spark is formed u 100 ns after the breakdown.The current pulse of a supershort avalanche electron beam(SAEB)was measured with a collector at various pressures of air.Experiments show that there are two modes of generation of run away electrons.At an air pressure of 25-100 kPa,a single SAEB current pulse with a full width at half-maximum(FWHM)of 120-140 ps is observed.At the air pressure of 12.5 kPa,two current pulses of the electron beam are observed.FWHM of the first and second current pulses are ul40ps and u300 ps,respectively.The current pulse amplitude of the second electron beam is higher than that of the first one,but the electron energy is less.

关键词： diffuse discharge runaway electrons streamer breakdown displacement current

Runaway Electrons Pre-ionized Diffuse Discharges in SF6, Air, Argon and Nitrogen

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Journal of Chemistry and Chemical Engineering 2014年第12期8卷 1156-1161页

作者： Victor Fedotovich Tarasenko Dmitry Viktorovich Beloplotov mikhail ivanovich lomaev Dmitry Alexeevich Sorokin institute of High Current Electronics Siberian Branch of the Russian Academy of Sciences Tomsk 634055 Russia Department of Radiophysics and innovative Technologies National Research Tomsk State University Tomsk 634050 Russia

The formation of runaway electron pre-ionized diffuse discharges at the pressures 0.05-0.7 MPa of in air, argon, nitrogen, and SF6 in an inhomogeneous electric field was investigated. Dynamics of intensity of the discharge plasma radiation from the different discharge gap regions in the gas pressure range (0.05-0.7 MPa) was established. it was shown that, the breakdown is occurred owing to the ionization wave, which starts from the electrode with small radius of curvature at both polarity of high voltage pulses. it is seen that formation of bright spots on the flat electrode at the negative polarity of the electrode with small radius of curvature are observed during the changing of the discharge current polarity. it was shown that, at positive polarity of electrode with a small radius of curvature, the bright spots on the flat electrode arise due to the participation of the dynamic displacement current in the gap conductance.

关键词：电离放电逃逸电子 SF6 空气扩散氮气氩气平板电极