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Analysis of electromagnetic pulses generated from ultrashort laser irradiation of solid targets at CLAPA

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Chinese Physics B 2022年第2期31卷 489-495页

作者： Yi-Lin Xu Dong-Yu Li Ya-Dong Xia Si-Yuan Zhang Min-Jian Wu Tong Yang Jun-Gao Zhu Hao Cheng Chuan-Ke Wang Chen Lin Ting-Shuai Li Xue-Qing Yan School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China State Key Laboratory of Nuclear Physics and Technology and Key Laboratory of HEDP of the Ministry of EducationCAPTPeking UniversityBeijing 100871China Research Center of Laser Fusion China Academy of Engineering Physics(CAEP)Mianyang 621900China

electromagnetic pulses(EMPs)produced by the interaction of a TW femtosecond laser with solid targets at the Compact Laser Plasma Accelerator(CLAPA)are measured and *** statistical results confirm that the intensities of the EMPs are closely related to both target material and *** signal of the titanium target is more abundant than that of the copper target with the same thickness,and the intensity of EMP is positively correlated with the target thickness for aluminium *** the boosted EMP radiations,the energy of accelerated protons is also simultaneously *** addition,EMPs emitted from the front of the target exceed those from the rear,which are also pertinent to the specific target *** resonant waveforms in the target chamber are analyzed using the fast Fourier transform,and the local resonance and the attenuation lead to changes of the frequency spectra of EMPs with variation of detecting positions,which is well supported by the modeling *** findings are beneficial to gaining insight into the mechanism of EMP propagation in a typical target chamber and providing more information for EMP shielding design.

关键词： laser driven proton accleration electromagnetic pulses laser target

Generation and regulation of electromagnetic pulses generated by femtosecond lasers interacting with multitargets

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Nuclear Science and Techniques 2024年第1期35卷 96-107页

作者： Ya-Dong Xia De-Feng Kong Qiang-You He Zhen Guo Dong-Jun Zhang Tong Yang Hao Cheng Yu-Ze Li Yang Yan Xiao Liang Ping Zhu Xing-Long Xie Jian-Qiang Zhu Ting-Shuai Li Chen Lin Wen-Jun Ma Xue-Qing Yan State Key Laboratory of Nuclear Physics and Technology and Key Laboratory of HEDP of the Ministry of EducationCAPTPeking UniversityBeijing 100871China Beijing Laser Acceleration Innovation Center Beijing 101407China Institute of Guangdong Laser Plasma Technology Guangzhou 510540China National Laboratory on High Power Laser and Physics Shanghai Institute of Optics and FineChinese Academy of SciencesShanghai 201800China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China

Ultrashort and powerful laser interactions with a target generate intense wideband electromagnetic pulses(EMPs).In this study,we report EMPs generated by the interactions between petawatt(30 fs,1.4×10^(20) W/cm^(2))femtosecond(fs)lasers with metal flat,plastic flat,and plastic nanowire-array(NWA)*** analyses are conducted on the EMPs in terms of their spatial distribution,time and frequency domains,radiation energy,and *** results indicate that EMPs from metal targets exhibit larger amplitudes at varying angles than those generated by other types of targets and are enhanced significantly for NWA *** a plastic target holder and increasing the laser focal spot can significantly decrease the radiation energy of the ***,the composite shielding materials indicate an effective shielding effect against *** simulation results show that the NWA targets exert a collimating effect on thermal electrons,which directly affects the distribution of *** study provides guidance for regulating EMPs by controlling the laser focal spot,target parameters,and target rod material and is beneficial for electromagnetic-shielding design.

关键词： electromagnetic pulses Laser plasma interaction electromagnetic shielding Electron distribution

Spatial and temporal evolution of electromagnetic pulses from solid target irradiated with multi-hundred-terawatt laser pulse inside target chamber

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Plasma Science and Technology 2024年第2期26卷 62-69页

作者：何强友邓志刚张智猛夏亚东张博孟令彪贺书凯黄华杨雷刘红杰范伟林晨周维民李廷帅颜学庆 State Key Laboratory of Nuclear Physics and Technology and Key Laboratory of HEDP of the Ministry of EducationCAPTPeking UniversityBeijing 100871People's Republic of China Science and Technology on Plasma Physics Laboratory Research Center of Laser FusionChina Academy of Engineering PhysicsMianyang 621900People's Republic of China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731People's Republic of China Beijing Laser Acceleration Innovation Center Beijing 101400People's Republic of China

Giant electromagnetic pulses(EMPs) induced by high-power laser irradiating solid targets interfere with various experimental diagnoses and even damage equipment,so unveiling the evolution of EMPs inside the laser chamber is crucial for designing effective EMP *** this work,the transmission characteristics of EMPs as a function of distances from the target chamber center(TCC) are studied using B-dot *** mean EMP amplitude generated by picosecond laser-target interaction reaches 561 kV m^(-1),357 kV m^(-1),395 kV m^(-1),and 341 kV m^(-1)at 0.32 m,0.53 m,0.76 m,and 1 m from TCC,which decreases dramatically from 0.32 m to 0.53 ***,it shows a fluctuation from 0.53 m to 1 *** temporal features of EMPs indicate that time-domain EMP signals near the target chamber wall have a wider full width at half maximum compared to that close to TCC,mainly due to the echo oscillation of electromagnetic waves inside the target chamber based on simulation and *** conclusions of this study will provide a new approach to mitigate strong electromagnetic pulses by decreasing the echo oscillation of electromagnetic waves inside the target chamber during laser coupling with targets.

关键词： target electromagnetic pulses spatial distribution

Laser produced electromagnetic pulses: generation, detection and mitigation

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High Power Laser Science and Engineering 2020年第2期8卷 88-146页

作者： Fabrizio Consoli Vladimir TTikhonchuk Matthieu Bardon Philip Bradford David CCarroll Jakub Cikhardt Mattia Cipriani Robert JClarke Thomas ECowan Colin NDanson Riccardo De Angelis Massimo De Marco Jean-Luc Dubois Bertr Etchessahar Alejro Laso Garcia David IHillier Ales Honsa Weiman Jiang Viliam Kmetik Josef Krása Yutong Li FredériéLubrano Paul McKenna Josefine Metzkes-Ng Alexre Poyé Irene Prencipe Piotr Ra¸czka Rol ASmith Roman Vrana Nigel CWoolsey Egle Zemaityte Yihang Zhang Zhe Zhang Bernhard Zielbauer David Neely ENEA Fusion and Technologies for Nuclear Safety DepartmentC.R.Frascati00044 FrascatiItaly CELIA University of BordeauxCNRSCEA33405 TalenceFrance ELI Beamlines Institute of PhysicsCzech Academy of Sciences25241 Dolni BrezanyCzech Republic CEA DAMCESTA33116 Le BarpFrance Department of Physics York Plasma InstituteUniversity of YorkHeslingtonYork YO105DDUK Central Laser Facility Rutherford Appleton LaboratorySTFCUKRIChiltonDidcotOxfordshire OX110QXUK Czech Technical University in Prague Faculty of Electrical Engineering16627 Prague 6Czech Republic Institute of Plasma Physics of the Czech Academy of Sciences Za Slovankou 318200 PragueCzech Republic Helmholtz-Zentrum Dresden-Rossendorf Institut fur Strahlenphysik01328 DresdenGermany AWE plc AldermastonReadingBerkshire RG74PRUK OxCHEDS Clarendon LaboratoryDepartment of PhysicsUniversity of OxfordOxford OX13PUUK CIFS The Blackett LaboratoryImperial College LondonLondon SW72AZUK Centro de Laseres Pulsados(CLPU) 37185 VillamayorSalamancaSpain Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Institute of Physics of the Czech Academy of Sciences Na Slovance 218221 PragueCzech Republic School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Physics Scottish Universities Physics Alliance(SUPA)University of StrathclydeGlasgow G40NGUK Laboratory PIIM University Aix-Marseille-CNRS13397 MarseilleFrance Institute of Plasma Physics and Laser Microfusion 01-497 WarsawPoland The Blackett Laboratory Imperial College LondonLondon SW72AZUK PHELIX Group GSI Helmholtzzentrum fur SchwerionenforschungD-64291 DarmstadtGermany

This paper provides an up-to-date review of the problems related to the generation,detection and mitigation of strong electromagnetic pulses created in the interaction of high-power,high-energy laser pulses with different types of solid *** includes new experimental data obtained independently at several international *** mechanisms of electromagnetic field generation are analyzed and considered as a function of the intensity and the spectral range of emissions they *** major emphasis is put on the GHz frequency domain,which is the most damaging for electronics and may have important *** physics of electromagnetic emissions in other spectral domains,in particular THz and MHz,is also *** theoretical models and numerical simulations are compared with the results of experimental measurements,with special attention to the methodology of measurements and complementary *** the underlying physical processes is the basis for developing techniques to mitigate the electromagnetic threat and to harness electromagnetic emissions,which may have promising applications.

关键词： electromagnetic pulses high-power lasers diagnostics mitigation techniques

Gene Expression Changes in the Pituitary Gland of Rats Exposed to electromagnetic pulses

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Biomedical and Environmental Sciences 2011年第5期24卷 560-568页

作者： QI YuHong LIANG Jun HIM YanPing DING GuiRong LIU JunYe SU XiaoMing GUO GuoZhen Department of Radiotherapy Tangdu HospitalFourth Military Medical UniversityXi＇an 710038ShaanxiChina Department of Radiotion Medicine Faculty of Preventive MedicineFourth Military Medical UniversityXi＇an 710032ShaanxiChina Department of Pathology Faculty of Preclinical MedicineFourth Military Medical UniversityXi＇an 710032ShaanxiChina

Objective We examined alterations in the expression of tumorigenesis‐related genes in the pituitary gland of rats exposed to electromagnetic pulses （EMP）.Methods The global gene expression profiles of the pituitary gland in EMP‐exposed and control groups were detected by cDNA microarray *** then validated and further investigated the reduced expression of two tumorigenesis‐related genes,Pten,and Jund,by assessing their mRNA and protein expression by quantitative real‐time‐PCR,western blotting,and immunohistochemistry in the pituitary gland of rats 6 months after exposure to *** EMP exposure induced genome‐wide gene expression changes in the rat pituitary *** was decreased expression of the Pten and Jund mRNAs and proteins in EMP‐exposed rats compared with in unexposed control *** EMP exposure alters the expression of tumorigenesis‐related genes in the pituitary *** tumorigenesis‐related genes are potentially involved in the development of pituitary gland tumors in rats.

关键词： Tumorigenesis electromagnetic pulses Pituitary gland Pten Jund

Detecting the meteoroid by measuring the electromagnetic waves excited by the collision between the hypervelocity meteoroid and spacecraft

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Plasma Science and Technology 2022年第11期24卷 70-77页

作者： Bo LIU Heng ZHANG Bin XU Zhengzheng MA Hui LI Wenshan DUAN College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070Peopleʼs Republic of China National Key Laboratory of electromagnetic Environment(LEME) China Research Institute of Radio Wave PropagationQingdao 266107Peopleʼs Republic of China

The electromagnetic pulse excited by the collision between a hypervelocity meteoroid and a spacecraft is studied both numerically and *** is found that there are two kinds of electromagnetic *** high-frequency electromagnetic pulse may be excited by the sum of all the electric *** electron can be considered as an electric *** low-frequency electromagnetic pulse is produced by the Langmuir oscillation of *** energy flux density and the duration time of the excited low-frequency electromagnetic pulse by the meteoroid are also studied in the present *** is shown that the energy flux density increases as either the impact speed or the mass of the meteoroid *** is also shown that the duration time decreases as both the impact speed and the mass of the meteoroid *** measuring the strength and the duration time of the electromagnetic pulse excited by the collision between the hypervelocity meteoroid and spacecraft,we can estimate the speed and the mass of the hypervelocity meteoroid,which will be helpful in space flight and space exploration.

关键词： plasma electromagnetic pulses hypervelocity impact PIC simulation

Spontaneous Emission of a Two-Level Static Atom Coupling with electromagnetic Vacuum Fluctuations Outside a High-Dimensional Einstein Gauss-Bonnet Black Hole

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Chinese Physics Letters 2014年第10期31卷 5-9页

作者：张明杨战营岳瑞宏 School of Physics Northwest University Xi'an 710069 Faculty of Science Ningbo University Ningbo 315211

Using the generalized formalism of Dalibard, Dupont-Roc and Cohen-Tannoudji we investigate the spontaneous excitation of a static atom interacting with electromagnetic vacuum fluctuations outside an Einstein Gauss-Bonnet black hole in d-dimensions. It shows that spontaneous excitation does not occur in a Boulware vacuum, while exists in an Unruh vacuum and Hattie-Hawking vacuum. As to the total rate of change of the atomic energy, it does not receive the contribution from the coupling constant of the Gauss-Bonnet term at spatial infinity, only the dimensional parameter has the contribution to it. Near the event horizon, both the coupling constant and the dimension p contribute to the total rate of change of the atomic energy in all three kinds of vacuum. We discuss the contribution of the coupling constant and dimensional factor to the results in three different kinds of spacetime lastly.

关键词： SPONTANEOUS emission FLUCTUATIONS (Physics) MAGNETIC couplings GAUSS-Bonnet theorem electromagnetic pulses VACUUM-gages

Transient electromagnetic fields generated in experiments at the PHELIX laser facility

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High Power Laser Science and Engineering 2021年第4期9卷 212-225页

作者： M.Scisciò F.Consoli M.Salvadori N.E.Andreev N.G.Borisenko S.Zähter O.Rosmej ENEA Fusion and Technologies for Nuclear Safety Department00044 FrascatiItaly Joint Institute for High Temperatures Russian Academy of Sciences125412 MoscowRussia Moscow Institute of Physics and Technology(National Research University) 141701 MoscowRussia P.N.Lebedev Physical Institute Russian Academy of Sciences119991 MoscowRussia GSI Helmholtzzentrum für Schwerionenforschung GmbH 64291 DarmstadtGermany Goethe University Frankfurt 60438 Frankfurt am MainGermany

Large-amplitude electromagnetic radiofrequency fields are created by the charge-separation induced in interactions of high-intensity,short-pulse lasers with solid targets and have intensity that decreases with the distance from the ***,it was experimentally proved very recently that charged particles emitted by petawatt laser±target interactions can be deposited on a capacitor-collector structure,far away from the target,and lead to the rapid(nanosecond-scale)generation of large quasi-static electric fields(MV/m),over wide *** demonstrate here the generation of both these fields in experiments at the PHELIX laser facility,with approximately 20 J energy and approximately 10^(19)W/cm^(2)intensity,for picoseconds laser pulses,interacting with pre-ionized polymer foams of near critical ***-static fields,up to tens of k V/m,were here observed at distances larger than 1 m from the target,with results much higher than the radiofrequency *** is of primary importance for inertial-confinement fusion and laser±plasma acceleration and also for promising applications in different scenarios.

关键词： electromagnetic pulse mitigation electromagnetic pulses laser-driven acceleration laser-plasma