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High Power Laser Science and Engineering 2022年第3期10卷 2-10页

作者： J.B.Ohland U.Eisenbarth B.Zielbauer Y.Zobus D.Posor J.Hornung D.reemts V.Bagnoud gsi helmholtzzentrum für schwerionenforschung 64291DarmstadtGermany Institute for Applied Physics Technische Universität Darmstadt64289 DarmstadtGermany Institute of Nuclear Physics Technische Universität Darmstadt64289 DarmstadtGermany Helmholtz-Institut Jena 07743 JenaGermany

In order to reach the highest intensities,modern laser systems use adaptive optics to control their beam ***,the focal spot is optimized after the compression stage of the system in order to avoid spatio-temporal *** also requires a wavefront sensor after the compressor,which should be able to measure the wavefront *** PHELIX,we have developed an ultra-compact post-compressor beam diagnostic due to strict space constraints,measuring the wavefront over the full aperture of 28 *** system features all-reflective imaging beam transport and a high dynamic range in order to measure the wavefront in alignment mode as well as on shot.

关键词： adaptive optics beam quality high intensity laser diagnostics on shot Strehl wavefront

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金属真空弧离子源引出强流离子束的数值模拟

核技术 2006年第2期29卷 97-101页

作者：向伟 Spdtke P Hollinger r Galonska M Heymach F 中国工程物理研究院电子工程研究所绵阳621900 Gesellschaft für schwerionenforschung mbH-gsi

为了引出更高强度、更高亮度的铀离子束,以满足重离子研究中心(Gesellschaft fur schwerionenforschung mbH,gsi)重离子同步加速器的需求,本文用三维的计算机程序KOBrA3-INP对金属真空弧离子源(Metal vapor vacuum arc ion source,MEVVA)引出强流铀离子束在引出系统和后加速系统中的动力学特性进行了研究,讨论了离子源发射束流密度对引出束性能的影响。结果表明,束流损失主要发生在引出系统和后加速系统之间的漂移区;在假设漂移区束流被空间电荷中和的情况下,模拟结果和实验结果符合;在发射束流密度为180-230 mA／cm2范围内,经后加速的束流强度变化不大。

关键词：金属真空弧离子源强流铀离子束后加速系统数值模拟

Design,installation and commissioning of the ELI-Beamlines high-power,high-repetition rate HAPLS laser beam transport system to P3

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High Power Laser Science and Engineering 2021年第2期9卷 215-240页

作者： S.Borneis T.Laštovickaˇ M.Sokol T.-M.Jeong F.Condamine O.renner V.Tikhonchuk H.Bohlin A.Fajstavr J.-C.Hernandez N.Jourdain D.Kumar D.Modranskýˇ A.Pokorný A.Wolf S.Zhai G.Korn S.Weber eli-beamlines center institute of physicsczech academy of sciencesdolníbˇrežanyczech republic gsi helmholtzzentrum für schwerionenforschung gmbh darmstadtgermany centre lasers intenses et applications university of bordeaux-cnrs-ceatalencefrance school of science xi’an jiaotong universityxi’anchina

The design and the early commissioning of the ELI-Beamlines laser facility’s 30 J,30 fs,10 Hz HAPLS(High-repetitionrate Advanced Petawatt Laser System)beam transport(BT)system to the P3 target chamber are described in *** is the world’s first and with 54 m length,the longest distance high average power petawatt(PW)BT system ever *** connects the HAPLS pulse compressor via the injector periscope with the 4.5 m diameter P3 target chamber of the plasma physics group in hall *** is the largest target chamber of the facility and was connected first to the BT *** major engineering challenges are the required high vibration stability mirror support structures,the high pointing stability optomechanics as well as the required levels for chemical and particle cleanliness of the vacuum vessels to preserve the high laser damage threshold of the dielectrically coated high-power mirrors.A first commissioning experiment at low pulse energy shows the full functionality of the BT system to P3 and the novel experimental infrastructure.

关键词： beam transport system cleanliness high-power laser laser commissioning laser-plasma experiment optomechanics stability X-ray user facility

STM and raman Spectroscopic Study of Graphite Irradiated by Heavy Ions

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IMP & HIrFL Annual report 2002年 52-53页

作者： C.Trautmann,r.Neumann,C.Müller Gesellschaft fur schwerionenforschung(gsi) Planckstr.1 64291 Darmstadt Germany. Gesellschaft fur schwerionenforschung(gsi) Planckstr.1 64291 Darmstadt Germany. Gesellschaft fur schwerionenforschung(gsi) Planckstr.1 64291 Darmstadt Germany.

Freshly-cleaved HOPG crystals were irradiated with Ni, Zn, Xe and U ions of specific energy 11.4 MeV/u at the linear accelerator UNILAC and with Ne, Cr, Zn, Xe ions (1.4 MeV/u) at the high-charge injector HLI, both facilities are in operation at gsi, Darmstadt. The irradiation with Fe ions was performed at HIrFL (22 MeV/u) of IMP, Lanzhou. All irradiations were performed at room temperature and under beam incidence normal

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Millijoule ultrafast optical parametric amplification as replacement for high-gain regenerative amplifiers

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High Power Laser Science and Engineering 2023年第4期11卷 33-44页

作者： Yannik Zobus Christian Brabetz Johannes Hornung Jonas BOhland Dirk reemts Ji-Ping Zou Markus Loeser Daniel Albach Ulrich Schramm Vincent Bagnoud Technische Universität Darmstadt DarmstadtGermany gsi helmholtzzentrum für schwerionenforschung GmbH DarmstadtGermany Laboratoire pour l’Utilisation des Lasers Intenses CNRSEcole PolytechniquePalaiseauFrance Helmholtz-Zentrum Dresden-rossendorf DresdenGermany Technische Universität Dresden DresdenGermany Helmholtz-Institut Jena JenaGermany

We report on the development of an ultrafast optical parametric amplifier front-end for the Petawatt High Energy Laser for heavy Ion eXperiments(PHELIX)and the Petawatt ENergy-Efficient Laser for Optical Plasma Experiments(PEnELOPE)*** front-end delivers broadband and stable amplification up to 1 mJ per pulse while maintaining a high beam *** implementation at PHELIX allowed one to bypass the front-end amplifier,which is known to be a source of *** the bypass,an amplified spontaneous emission contrast of 4.9×10^(−13)and a pre-pulse contrast of 6.2×10^(−11)could be *** to its high stability,high beam quality and its versatile pump amplifier,the system offers an alternative for high-gain regenerative amplifiers in the front-end of various laser systems.

关键词： high-intensity laser temporal laser contrast ultrafast optical parametric amplification

Level Crossing of N*(1535)-hole and η Modes and Partial restoration of Chiral Symmetry in η-mesic Nuclei

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原子核物理评论 2009年第S1期26卷 100-103页

作者： H.Nagahiro D.Jido E.E.Kolomeitsev S.Hirenzaki research Center for Nuclear Physics(rCNP) Osaka University Yukawa Institute for Theoretical Physics Kyoto University School of Physics and Astronomy University of Minnesota Gesellschaft fr schwerionenforschung (gsi) Department of Physics Nara Women's University

We investigate the properties of the η-nucleus interaction by postulating the N*(1535) dominance for ηN system. Since the mass gap of N* and N is very close to the η meson mass,there is the possibility of the level crossing between the N*-h and η modes in finite density. We postulate the N*(1535) resonance for the ηN system and consider quite distinct N* properties in finite density which are predicted by two independent chiral models. We find that we can obtain clearer information on the in-medium N* properties and also on the η-nucleus interaction through the formation of the η-mesic nuclei by (π,N) reactions under the appropriate experimental conditions,which can be performed at existing and/or forthcoming facilities like J-PArC.

关键词： A eta-mesic nuclei N*(1535) in medium partial restoration of chiral symmetry

Possible Way to Synthesize Superheavy Element Z=117

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Chinese Physics Letters 2007年第9期24卷 2551-2554页

作者：冯兆庆靳根明黄明辉甘再国王楠李君清 Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 Gesellschaft fiir schwerionenforschung mbH (gsi) D-64291 Darmstadt Germany School of Physics Shenzhen University Shenzhen 518060

Within the framework of the dinuclear system model, the production of superheavy element Z = 117 in possible projectile-target combinations is analysed systematically. The calculated results show that the production cross sections are strongly dependent on the reaction systems. Optimal combinations, corresponding excitation energies and evaporation channels are proposed, such as the isotopes^248.249 Bk in ^48 Ca induced reactions in 3n evaporation channels and the reactions ^45Sc＋246.248Cm in 3n and 4n channels, and the system ^51 V＋ 244pu in 3n channel.

关键词： PrODUCTION CrOSS-SECTIONS DINUCLEAr-SYSTEM MODEL HEAVY-ION COLLISIONS COLD-fuSION NUCLEI MECHANISM

Applying the Kalman filter particle method to strange and open charm hadron reconstruction in the STAr experiment

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Nuclear Science and Techniques 2023年第10期34卷 148-157页

作者： Xin-Yue Ju Yue-Hang Leung Sooraj radhakrishnann Petr Chaloupka Xin Dong Yury Fisyak Pavol Federic Ivan Kisel Hong-Wei Ke Michal Kocan Spyridon Margetis Ai-Hong Tang Iouri Vassiliev Yi-Fei Zhang Xiang-Lei Zhu Maksym Zyzak University of Science and Technology of China Hefei 230026China Lawrence Berkeley National Laboratory BerkeleyCA 94720USA University of Heidelberg 69120 HeidelbergGermany Kent State University KentOH 44242USA Czech Technical University in Prague PragueCzech Republic Brookhaven National Laboratory UptonNY 11973USA Nuclear Physics Institute of the Czech Academy of Sciences PragueCzech Republic Goethe-Universitat Frankfurt Frankfurt am MainGermany Frankfurt Institute for Advanced Studies Frankfurt am MainGermany gsi helmholtzzentrum für schwerionenforschung GmbH DarmstadtGermany Tsinghua University Beijing 100084China

We applied KF Particle, a Kalman Filter package for secondary vertex finding and fitting, to strange and open charm hadron reconstruction in heavy-ion collisions in the STAr experiment. Compared to the conventional helix swimming method used in STAr, the KF Particle method considerably improved the reconstructed Λ, Ω, and D~0 significance. In addition, the Monte Carlo simulation with STAr detector responses could adequately reproduce the topological variable distributions reconstructed in real data using the KF Particle method, thereby retaining substantial control of the reconstruction efficiency uncertainties for strange and open charm hadron measurements in heavy-ion collisions.

关键词： Heavy-ion collisions Secondary vertex finding Kalman filter

How the laser beam size conditions the temporal contrast in pulse stretchers of chirped-pulse amplification lasers

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High Power Laser Science and Engineering 2022年第6期10卷 1-7页

作者： Simon roeder Yannik Zobus Christian Brabetz Vincent Bagnoud gsi helmholtzzentrum für schwerionenforschung GmbH DarmstadtGermany Technische Universität Darmstadt DarmstadtGermany Helmholtz-Institut Jena JenaGermany

In this work,we propose and verify experimentally a model that describes the concomitant influence of the beam size and optical roughness on the temporal contrast of optical pulses passing through a pulse stretcher in chirped-pulse amplification laser *** develop an analytical model that is capable of predicting the rising edge caused by the reflection from an optical element in a pulse stretcher,based on the power spectral density of the surface and the spatial beam profile on the *** an experimental campaign,we characterize the temporal contrast of a laser pulse that passed through either a folded or an unfolded stretcher design and compare these results with the analytical *** varying the beam size for both setups,we verify that optical elements in the near-and the far-field act opposed to each with respect to the temporal contrast and that the rising edge caused by a surface benefits from a larger spatial beam size on that surface.

关键词： chirped-pulse amplification laser stretcher temporal contrast