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Precise wavelength measurements of potassium He- and Li-like satellites emitted from the laser plasma of a mineral target

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Matter and Radiation at Extremes 2021年第1期6卷 15-20页

作者： S.N.Ryazantsev i.yu.skobelev E.D.Filippov A.S.Martynenko M.D.Mishchenko M.Krus O.Renner S.A.Pikuz National Research Nuclear University MEPhi(Moscow Engineering Physics institute) Kashirskoe Shosse 31115409 MoscowRussia Joint institute for High Temperatures of the Russian Academy of Sciences Izhorskaya 13 Bldg 2125412 MoscowRussia Federal Research Center institute of Applied Physics of the Russian Academy of Sciences 46 Ulyanov Str.603950 Nizhny NovgorodRussia Laser Plasma Department Institute of Plasma Physics of the CASZa Slovankou 1782/3Libeˇn18200 PragueCzech Republic Department of Radiation and Chemical Physics Institute of Physics of the CASNa Slovance 1999/218221 PragueCzech Republic ELi-Beamlines Institute of Physics of the CASZa Radnici83525241 Dolni BiezanyCzech Republic

Atomic models of high-Zmulticharged ions are extremely complex and require experimental *** to do so is to crosscheck the predicted wavelengths of resonance transitions in He-and Li-like ions against precise spectroscopic measurements that use the spectral lines of H-like ions for spectra calibration;these reference data can be modeled with outstanding ***,for elements with Z of at least 15,it is quite difficult to create a hot dense plasma with a large concentration ofH-like charge *** mitigate this issue,the suggestion here is to use as laser targets particular minerals comprising elements with moderate(between 15 and 30)and low(less than 15)Z,with emission from the latter delivering perfect reference lines over a whole range o fHe-and Li-like moderate-Z emission under *** approach is implemented to measure the wavelengths of resonance transitions(1snp→1s^(2) for n=2,3)in He-likeKions and their dielectronic satellites by irradiating plates of orthoclase(KAlSi_(3)O_(8))with0.5-kJ subnanosecond laser pulses.X-ray spectra of the laser-generated plasma contain the investigated lines of highly charged K-ions together with precisely known reference lines of H-like Al and Si *** K-shell spectral line wavelengths are measured with a precision of around 0.3 mA.

关键词： laser potassium transitions

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X-ray spectroscopy evidence for plasma shell formation in experiments modeling accretion columns in young stars

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Matter and Radiation at Extremes 2019年第6期4卷 22-29页

作者： E.D.Filippov i.yu.skobelev G.Revet S.N.Chen B.Khiar A.Ciardi D.Khaghani D.P.Higginson S.A.Pikuz J.Fuchs Joint institute for High Temperatures RAS125412 MoscowRussia National Research Nuclear University “MEPHI”115409 MoscowRussia LULi-CNRS ´Ecole PolytechniqueCEA:Universit´e Paris-SaclayUPMC Univ Paris 06:Sorbonne Universit´eF-91128 Palaiseau CedexFrance ELi-NP “Horia Hulubei”National Institute for Physics and Nuclear Engineering30 Reactorului StreetRO-077125 Bucharest-MagureleRomania Sorbonne Universit´e Observatoire de ParisUniversit´e PSLCNRSLERMAF-75005 ParisFrance Flash Center for Computational Science University of Chicago5640 S.Ellis AvenueChicagoIllinois 60637USA University of Bordeaux CEACNRSCentre Lasers Intenses et ApplicationsUMR 510733405 Talence CedexFrance Lawrence Livermore National Laboratory LivermoreCalifornia 94551USA

Recent achievements in laboratory astrophysics experiments with high-power lasers have allowed progress in our understanding of the early stages of star *** particular,we have recently demonstrated the possibility of simulating in the laboratory the process of the accretion of matter on young stars[*** et al.,***.3,e1700982(2017)].The present paper focuses on x-ray spectroscopy methods that allow us to investigate the complex plasma hydrodynamics involved in such *** demonstrate that we can infer the formation of a plasma shell,surrounding the accretion column at the location of impact with the stellar surface,and thus resolve the present discrepancies between mass accretion rates derived from x-ray and optical-radiation astronomical observations originating from the same *** our experiments,the accretion column ismodeled by having a collimated narrow(1 mm diameter)plasma stream first propagate along the lines of a large-scale external magnetic field and then impact onto an obstacle,mimicking the high-density region of the stellar chromosphere.A combined approach using steady-state and quasi-stationarymodels was successfully applied tomeasure the parameters of the plasma all along its propagation,at the impact site,and in the structure surrounding the impact *** formation of a hot plasma shell,surrounding the denser and colder core,formed by the incoming stream of matter is observed near the obstacle using x-ray spatially resolved spectroscopy.

关键词： accretion stars stellar

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Optimization of a laser plasma-based x-ray source according to WDM absorption spectroscopy requirements

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Matter and Radiation at Extremes 2021年第1期6卷 37-44页

作者： A.S.Martynenko S.A.Pikuz i.yu.skobelev S.N.Ryazantsev C.D.Baird N.Booth L.N.K.Dohl P.Durey A.Ya.Faenov D.Farley R.Kodama K.Lancaster P.McKenna C.D.Murphy C.Spindloe T.A.Pikuz N.Woolsey Joint institute for High Temperatures of the Russian Academy of Sciences 125412 MoscowRussia National Research Nuclear University MEPhi Kashirskoe Sh.31115409 MoscowRussia York Plasma institute Department of PhysicsUniversity of YorkYork YO105DDUnited Kingdom Central Laser Facility STFC Rutherford Appleton LaboratoryDidcot OX110QXUnited Kingdom Open and Transdisciplinary Research initiative Osaka UniversityOsaka 565-0871Japan institute of Laser Engineering Osaka UniversitySuita 565-0871Japan Department of Physics SUPAUniversity of StrathclydeGlasgow G40NGUnited Kingdom

X-ray absorption spectroscopy is a well-accepted diagnostic for experimental studies of warm dense *** requires a short-lived X-ray source of sufficiently high emissivity and without characteristic lines in the spectral range of *** the present work,we discuss how to choose an optimum material and thickness to get a bright source in the wavelength range 2A–6A(∼2 keV to 6 keV)by considering relatively low-Z *** demonstrate that the highest emissivity of solid aluminum and silicon foil targets irradiated with a 1-ps high-contrast sub-kJ laser pulse is achieved when the target thickness is close to 10μ*** outer plastic layer can increase the emissivity even further.

关键词： laser WDM source

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Some insights into Cluster Structure of ^(9)Be from ^(3)He + ^(9)Be Reaction

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World Journal of Nuclear Science and Technology 2015年第4期5卷 265-273页

作者： S.M.Lukyanov M.N.Harakeh M.A.Naumenko Yi Xu W.H.Trzaska V.Burjan V.Kroha J.Mrazek V.Glagolev S.Piskoi E.i.Voskoboynik S.V.Khlebnikov yu.E.Penionzhkevich N.K.skobelev yu.G.Sobolev G.P.Tyurin K.Kuterbekov yu.Tuleushev Flerov Laboratory of Nuclear Reactions DubnaRussian Federation KVi-CART University of GroningenGroningenThe Netherlands Nuclear Physics institute RezCzech Republic Department of Physics University of JyvaskylaJyvaskylaFinland Khlopin institute St.PetersburgRussian Federation National Research Nuclear University“MEPhi” MoscowRussian Federation Eurasian Gumilev University AstanaKazakhstan Nuclear Physics institute AlmatyKazakhstan

The study of inelastic scattering and multi-nucleon transfer reactions was performed by bombarding a 9Be target with a 3He beam at the incident energy of 30 MeV. Angular distributions for 9Be(3He, 3He) 9Be, 9Be (3He, 3He) 8Be, 9Be (3He, 7Be) 5He, 9Be (3He, 6Li) 6Li and 9Be (3He, 7Li) 5Li reaction channels were measured. Experimental angular distributions for the corresponding ground states (g.s.) were analyzed within the framework of the optical model, the coupled-channel approach and the distorted-wave Born approximation. Cross sections for channels leading to unbound 5Heg.s., 5Lig.s. and 8Be systems were obtained from singles measurements where the relationship between the energy and the scattering angle of the observed stable ejectile was constrained by two-body kinematics. information on the cluster structure of 9Be was obtained from the transfer channels. it was concluded that cluster transfer was an important mechanism in the investigated nuclear reaction channels. in the present work an attempt was made to estimate the relative strengths of the interesting (n + 8Be) and (α + 5He) cluster configurations in 9Be. The contributions of different exit channels have been determined confirming that the (α + 5He) configuration plays an important role. The configuration of 8Be consisting of two bound helium clusters (5He + 6He) is significantly suppressed, whereas the two-body configurations (n + 8Be) and (α + 5He) including unbound 8Be and 5He are found more probable.

关键词： Nuclear Reaction Mechanism Cluster Structure DWBA

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