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Exploring fs-laser irradiation damage subthreshold behavior of dielectric mirrors via electrical measurements

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High Power Laser Science and engineering 2024年第2期12卷 24-32页

作者： Petrisor Gabriel Bleotu radu Udrea Alice dumitru Olivier Uteza Maria-diana Mihai dan Gh Matei daniel Ursescu Stefan Irimiciuc Valentin Craciun Extreme Light Infrastructure-nuclear physics(ELI-NP) Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering(IFIN-HH)MagureleRomania doctoral School of physics University of BucharestMagureleRomania LULI-CNrS CEAUniversite SorbonneEcole PolytechniqueInstitut Polytechnique de ParisPalaiseau CEDEXFrance Apel Laser IlfovRomania Aix-Marseille University CNRSLP3 UMR 7341MarseilleFrance horia hulubei national institute for r&d in physics and nuclear engineering(IFIN-HH) MagureleRomania University Politehnica of Bucharest BucharestRomania national institute for Lasers Plasma and radiation physics MagureleRomania

With ultrafast laser systems reaching presently 10 PW peak power or operating at high repetition rates,research towards ensuring the long-term,trouble-free performance of all laser-exposed optical components is *** work is focused on providing insight into the optical material behavior at fluences below the standardized laser-induced damage threshold(LIdT)value by implementing a simultaneous dual analysis of surface emitted particles using a Langmuir probe(LP)and the target current(TC).HfO_(2) and ZrO_(2) thin films deposited on fused silica substrates by pulsed laser deposition at various O_(2) pressures for defect and stoichiometry control were irradiated by Gaussian,ultrashort laser pulses(800 nm,10 Hz,70 fs)in a wide range of *** TC and LP collected signals were in good agreement with the existing theoretical description of laser–matter interaction at an ultrashort time *** approach for an in situ LIdT monitoring system provides measurable signals for below-threshold irradiation conditions that indicate the endurance limit of the optical surfaces in the single-shot energy scanning *** LIdT value extracted from the LP-TC system is in line with the multipulse statistical analysis done with ISO 21254-2:2011(E).The implementation of the LP and TC as on-shot diagnostic tools for optical components will have a significant impact on the reliability of next-generation ultrafast and high-power laser systems.

关键词： HfO_(2) in situ detection Langmuir probe laser-induced damage threshold target current ZrO_(2)

Comprehensive analysis of uncertainty quantification for the^(58)Ni(n,p)^(58)Co reaction cross section

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Chinese physics C 2024年第9期48卷 170-175页

作者： Mahesh Choudhary Aman Sharma Namrata Singh Mahima Upadhyay Punit dubey A.Gandhi Akash Hingu G Mishra Sukanya de L.S.danu Ajay Kumar r.G.Thomas Saurav Sood Sajin Prasad S.Mukherjee I.N.ruskov Yu.N.Kopatch A.Kumar department of physics Banaras Hindu UniversityVaranasi 221005India horia hulubei national institute of physics and nuclear engineering-IFIN-HH Bucharest 077125Romania department of physics The Maharaja Sayajirao University of BarodaVadodara 390002India nuclear physics division Bhabha Atomic Research CentreMumbai 400085India Health physics division Bhabha Atomic Research CentreMumbai 400085India department of Electrical Power engineering Brno University of TechnologyBrno 61600Czech Republic institute for nuclear research and nuclear Energy Bulgarian Academy of SciencesSofia 1784Bulgaria Joint institute for nuclear research(JINr) Dubna 141980Russia

In this study,we measured the^(58)Ni(n,p)^(58)Co reaction cross section with neutron energies of 1.06,1.86,and 2.85 *** cross section was measured using neutron activation techniques andγ-ray spectroscopy,and it was compared with cross section data available in the ***,we calculated the covariance matrix of the measured cross section for the aforementioned nuclear *** uncertainties of the theoretical calculation for^(58)Ni(n,p)^(58)Co reaction cross section were calculated via Monte Carlo *** this study,we used uncertainties in the optical model and level density parameters to calculate uncertainties in the theoretical cross *** theoretical calculations were performed by using *** this study,we aim to analyze the effect of uncertainties of the nuclear model input as well as different experimental variables used to obtain the values of reaction cross section.

关键词： ^(58)Ni(n p)^(58)Co reaction γ-ray spectroscopy uncertainty quantification of cross section covariance analysis

Optimizing laser coupling,matter heating,and particle acceleration from solids using multiplexed ultraintense lasers

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Matter and radiation at Extremes 2024年第4期9卷 16-28页

作者： Weipeng Yao Motoaki Nakatsutsumi Sébastien Buffechoux Patrizio Antici Marco Borghesi Andrea Ciardi Sophia N.Chen Emmanuel d’Humières Laurent Gremillet robert Heathcote Vojtech Horny Paul McKenna Mark N.Quinn Lorenzo romagnani ryan royle Gianluca Sarri Yasuhiko Sentoku Hans-Peter Schlenvoigt Toma Toncian Olivier Tresca Laura Vassura Oswald Willi Julien Fuchs LULI-CNrS CEASorbonne UniversitéEcole PolytechniqueInstitut Polytechnique de ParisF-91128 Palaiseau CedexFrance Sorbonne Université Observatoire de ParisUniversité PSLCNRSLERMAF-75005 ParisFrance INrS-EMT 1650 BoulLionel-BouletVarennesQuebec J3X 1S2Canada Center for Plasma physics School of Mathematics and PhysicsQueen’s University BelfastBelfast BT71NNUnited Kingdom “horia hulubei”national institute for physics and nuclear engineering 30 Reactorului StreetRO-077125 Bucharest-MagureleRomania University of Bordeaux Centre Lasers Intenses et ApplicationsCNRSCEAUMR 5107F-33405 TalenceFrance CEA DAMDIFF-91297 ArpajonFrance Université Paris-Saclay CEALMCE91680 Bruyères-le-ChatelFrance Central Laser Facility STFC Rutherford Appleton LaboratoryDidcotUnited Kingdom SUPA Department of PhysicsUniversity of StrathclydeGlasgow G40NGUnited Kingdom department of physics University of NevadaRenoNevada 89557USA institute of Laser engineering Osaka University2-6 YamadaokaSuitaOsaka 565-0871Japan Institut fur Laser und Plasmaphysik Heinrich Heine Universitat DusseldorfDusseldorfGermany

realizing the full potential of ultrahigh-intensity lasers for particle and radiation generation will require multi-beam arrangements due to technology ***,we investigate how to optimize their coupling with solid ***,we show that overlapping two intense lasers in a mirror-like configuration onto a solid with a large preplasma can greatly improve the generation of hot electrons at the target front and ion acceleration at the target *** underlying mechanisms are analyzed through multidimensional particle-in-cell simulations,revealing that the self-induced magnetic fields driven by the two laser beams at the target front are susceptible to reconnection,which is one possible mechanism to boost electron *** addition,the resistive magnetic field generated during the transport of the hot electrons in the target bulk tends to improve their *** simulations also indicate that such effects can be further enhanced by overlapping more than two laser beams.

关键词： laser acceleration particle

Investigation of 58Ni(n, p)58Co reaction cross-section with covariance analysis

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Chinese physics C 2024年第2期48卷 78-90页

作者： Akash Hingu S.Mukherjee Siddharth Parashari Arora Sangeeta A.Gandhi Mahima Upadhyay Mahesh Choudhary Sumit Bamal Namrata Singh G.Mishra Sukanya de Saurav Sood Sajin Prasad G.Saxena Ajay Kumar r.G.Thomas B.K.Agrawal K.Katovsky A.Kumar department of physics Faculty of ScienceThe M.S.University of BarodaVadodara 390002India Faculty of Electrical engineering and Communication Brno University of TechnologyBrnoCzech Republic department of physics Faculty of ScienceUniversity of ZagrebBijenička c.32Zagreb 10000Croatia department of physics University Institute of SciencesChandigarh UniversityGharuanMohali 140413PunjabIndia department of physics Banaras Hindu UniversityVaranasi 221005India horia hulubei national institute for physics and nuclear engineering Măgurele 077125Romania nuclear physics division Bhabha Atomic Research CentreMumbai 400085India Health physics division Bhabha Atomic Research CentreMumbai 400085India department of physics(H&S) Government Women Engineering CollegeAjmer 305002India Saha institute of nuclear physics Kolkata 700064India Homi Bhabha national institute Anushakti NagarMumbai 400094India

The excitation function of the 58Ni(n,p)58Co reaction was measured using the well-established neutron activation technique andγ-ray *** in the energy range of 1.7 to 2.7 MeV were generated using the 7Li(p,n)*** neutron flux was measured using the standard 115In(n,n’)115mIn monitor *** results of the neutron spectrum averaged cross-section of 58Ni(n,p)58Co reactions were compared with existing cross-section data available in the EXFOr data library as well as with various evaluated data libraries such as ENdF/B-VIII.0,JEFF-3.3,JENdL-4.0,and *** calculations were performed using the nuclear reaction code *** nuclear level density(NLd)models were tested,and their results were compared with the present *** NLds were also obtained through the spectral distribution method(SdM).The cross-section results,along with the absolute errors,were obtained by investigating the uncertainty propagation and using the covariance *** forγ-ray true coincidence summing,low-energy background neutrons,andγ-ray self attenuation were *** experimental cross-section obtained in the present study is consistent with previously published experimental data,evaluated libraries,and theoretical calculations carried out using the TALYS code.

关键词： nuclear reactions (n,p)reaction cross-section measurement covariance analysis nuclear level density

High-flux electron beams from laser wakefield accelerators driven by petawatt lasers

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Plasma Science and Technology 2017年第7期19卷 7-11页

作者： Ming ZENG Ovidiu TESILEANU Extreme Light Infrastructure-nuclear physics Horia Hulubei National Institute for Physics and Nuclear Engineering

Laser wakefield accelerators （LWFAs） are considered to be one of the most compeuuve next- generation accelerator candidates. In this paper, we will study the potential high-flux electron beam production of an LWFA driven by petawatt-level laser pulses. In our three-dimensional particle-in-cell simulations, an optimal set of parameters gives -40 nC of charge with 2 PW laser power, thus -400 kA of instantaneous current if we assume the electron beam duration is 100 fs. This high flux and its secondary radiation are widely applicable in nuclear and QEd physics, industrial imaging, medical and biological studies.

关键词： laser accelerator petawatt laser high-flux electron beam

Production of medical radioisotope ^(64)Cu by photoneutron reaction using ELI-NP γ-ray beam

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nuclear Science and Techniques 2016年第4期27卷 147-151页

作者： Wen Luo School of nuclear Science and Technology University of South China Extreme Light Infrastructure - nuclear physics (ELI-NP)/‘‘horia hulubei’’ National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH)

Copper-64 is a radioisotope of medical interest that could be used for positron emission tomography imaging and targeted radiotherapy of cancer. In this work,we investigated the possibility of producing the^(64)Cu isotope through a^(65)Cu(γ,n) reaction using high-intensity γ-beams produced at the Extreme Light Infrastructurenuclear physics facility(ELI-NP). The specific activity for^(64)Cu was obtained as a function of target geometry, irradiation time, and electron beam energy, which translates into γ-beam energy. Optimized conditions for the generation of^(64)Cu isotopes at the ELI-NP were discussed. We estimated that an achievable saturation specific activity is of the order of 1–2 m Ci/g for thin targets(radius 1–2 mm,thickness 1 cm) and for a γ-beam flux of 10^(11) s ~1. Based on these results, the ELI-NP could provide great potential for the production of some innovative radioisotopes of medical interest in sufficient quantities suitable for nuclear medicine research.

关键词：放射性同位素设施生产中子反应射线束正电子发射断层成像医用靶向治疗基础设施

Magnetic glass-ceramics

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Journal of Advanced Ceramics 2012年第2期1卷 138-143页

作者： Viorel SANdU Mirela Sidonia NICOLESCU Victor KUNCSEr raluca dAMIAN Elena SANdU national institute of Materials physics Magurele 077125Romania “horia hulubei”national institute of nuclear physics and engineering Magurele 077125Romania

We present the magnetic properties of magnetic glass ceramics obtained by crystallization of Fe containing borosilicate *** types of nucleators have been used:Cr2O3 and *** role of the nucleators proved to be crucial in the size and morphology of the crystallites developed within glassy matrix as well in the magnetic *** former stimulates the growth of regular single crystals uniformly dispersed within the matrix whereas the latter leads to the formation of grains made of tiny(30 nm),*** magnetic response depends on the amount of Fe ions left dispersed within glassy matrix as paramagnetic *** P2O5 leads to the best structural magnetite,almost 42%of Fe ions are left dispersed in the matrix without magnetic *** the case of Cr2O3,the paramagnetic Fe is decreased to 12%but structural deficiency in the occupancy of the Fe sites of magnetite is revealed by Mössbauer spectroscopy.

关键词： glass ceramics Fe3O4 Mössbauer spectroscopy grain growth

Computation of products of phase space factors and nuclear matrix elements for double beta decay

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Chinese physics C 2019年第6期43卷 74-79页

作者： S.Stoica International Centre for Advanced Training and research in physics Subsidiary of INCDFM horia hulubei national institute of physics and nuclear engineering

nuclear matrix elements(NME) and phase space factors(PSF) entering the half-life formulas of the double-beta decay(dBd) process are two key quantities whose accurate computation still represents a challenge. In this study, we propose a new approach of calculating these, namely the direct computation of their product as an unique formula. This procedure allows a more coherent treatment of the nuclear approximations and input parameters appearing in both quantities and avoids possible confusion in the interpretation of dBd data due to different individual expressions adopted for PSF and NME(and consequently their reporting in different units) by different authors. Our calculations are performed for both two neutrino(2 vββ) and neutrinoless(0 vββ) decay modes, for five nuclei of the most experimental interest. Further, using the most recent experimental limits for 0νββ decay half-lives,we provide new constraints on the light mass neutrino parameter. Finally, by separating the factor representing the axial-vector constant to the forth power in the half-life formulas, we advance suggestions on how to reduce the errors introduced in the calculation by the uncertain value of this constant, exploiting the dBd data obtained from different isotopes and/or decay modes.

关键词： double-beta decay nuclear matrix elements phase space factors

Fusion reactions around the barrier for Be+^(238)U

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Chinese physics C 2021年第5期45卷 100-104页

作者： Bo Mei dimiter L.Balabanski Wei Hua Yu-Hu Zhang Xiao-Hong Zhou Cen-Xi Yuan Jun Su Sino-French institute of nuclear engineering and Technology Sun Y at-sen UniversityZhuhai 519082China institute of Modern physics Chinese Academy of SciencesLanzhou 730000China Extreme Light Infrastructure nuclear physics “Horia Hulubei”National R&D Institute for Physics and Nuclear EngineeringStrada Reactorului 30077125 Bucharest MagureleRomania

Fusion-evaporation cross sections of^(238)U(^(9)Be,5n)^(242)Cm are measured over a wide energy range around the Coulomb *** measured cross sections are compared with model calculations using two codes,namely HIVAP2 and KE ***2 calculations overestimate the measured fusion-evaporation cross sections by a factor of approximately *** KEWPIE2 calculations,two approaches,namely the Wentzel-Kramers-Brillouin(WKB)approximation and the empirical barrier-distribution(EBd)method,are used for the capture probability;both of them properly describe the measured cross ***,fusion cross sections of^(7.9)Be+^(238)Umeas-ured in two experiments are applied to constrain model calculations further through three codes,i.e,HIVAP2,KEWPIE2,and *** in these codes are also examined by comparison with measured fusion cross *** the comparisons indicate that the K EWPIE2 calculations using the WKB approximation agree well with the measured cross sections of both fusion reactions 7.9 Be+^(238)U and the fusion-evaporation reaction 238U(9 Be,5n)242 *** using the fusion code CCFULL are also in good agreement with the measured fusion cross sections of 7.9 Be+^(238)U.

关键词： fusion-evaporation reaction ^(238)U fusion cross sections near barrier energies