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Ultrahigh temporal contrast performance of the PHELIX petawatt facility

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High Power Laser Science and Engineering 2016年第4期4卷 1-8页

作者： V.Bagnoud f.Wagner Plasma physics dep. GSI Helmholtzzentrum für Schwerionenforschung GmbH Helmholtz Institute Jena

We report on the temporal contrast performance of the PHELIX facility in view of the requirements imposed by solidtarget interaction experiments. The requirement analysis for the nanosecond and picosecond temporal contrast is derived from empirical data and simple theoretical modeling, while the realization shows that using an ultrafast optical parametric amplifier and plasma mirrors enables meeting this specification.

关键词： amplified spontaneous emission chirped-pulse amplification optical parametric amplification temporal contrast

Bethe-Salpeter equations: mesons beyond the rainbow-ladder truncation

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Chinese Physics C 2010年第9期34卷 1500-1503页

作者： richard Williams Christian S.fischer Institute for Nuclear Physics Darmstadt University of Technology gsi helmholtzzentrum für schwerionenforschung gmbh

We investigate masses of light mesons from a coupled system of Dyson–Schwinger （DSE） and Bethe– Salpeter equations （BSE）,taking into account dominant non-Abelian,sub-leading Abelian,and dominant pion cloud contributions to the dressed quark-gluon *** axial-vector Ward-Takahashi identity preserving Bethe-Salpeter kernel is constructed and the spectrum of light mesons *** model goes significantly beyond the *** find that sub-leading Abelian corrections are further dynamically suppressed,and that our results supersede early qualitative predictions from simple truncation schemes.

关键词： Dyson-Schwinger equations Bethe-Salpeter equations light-mesons beyond rainbow-ladder

Accelerating ions with high-energy short laser pulses from submicrometer thick targets

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High Power Laser Science and Engineering 2016年第4期4卷 1-8页

作者： f.Wagner C.Brabetz O.Deppert M.roth T.Stohlker An.Tauschwitz A.Tebartz B.Zielbauer V.Bagnoud gsi helmholtzzentrum für schwerionenforschung gmbh Helmholtz Institut Jena Institut für Kernphysik Technische Universitat Darmstadt Institute for Theoretical Physics Frankfurt University

Using the example of the PHELIX high-energy short pulse laser we discuss the technical preconditions to investigate ion acceleration with submicrometer thick targets. We show how the temporal contrast of this system was improved to prevent pre-ionization of such targets on the nanosecond timescale. furthermore the influence of typical fluctuations or uncertainties of the on-target intensity on ion acceleration experiments is discussed. We report how these uncertainties were reduced by improving the assessment and control of the on-shot intensity and by optimizing the positioning of the target into the focal plane. finally we report on experimental results showing maximum proton energies in excess of 85 MeV for ion acceleration via the target normal sheath acceleration mechanism using target thicknesses on the order of one micrometer.

关键词： high-power laser technique laser-ion acceleration relativistic laser plasma interaction target normal sheath acceleration temporal contrast

review of accelerator driven heavy ion nuclear fusion

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Matter and radiation at Extremes 2018年第1期3卷 1-11页

作者： Ingo Hofmann gsi helmholtzzentrum fur schwerionenforschung gmbh Planckstr64291 DarmstadtGermany

Using high energy accelerators for energy production by nuclear fission goes back to the 1950's with plans for“breeder accelerators”as well as with early ideas on subcritical reactors,which are currently pursued in China and other ***,fusion came in,when the idea emerged in the mid 1970's to use accelerators and their highly time and space compressed beams in order to generate the extremely high density and temperatures required for inertial fusion energy *** to the higher repetition rates and efficiencies of accelerators,this was seen as a promising alternative to using high power *** an introduction to nuclear fission applications of accelerators,this review summarizes some of the scientific developments directed towards this challenging application e with focus on the European HIDIf-study-and outlines parameters of future high energy density experiments after construction of the fAIr/Germany and HIAf/China heavy ion accelerator projects.

关键词： repetition accelerator heavy

Zero Sound Propagation in femto-Scale Quantum Liquids

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Journal of Modern Physics 2012年第6期3卷 476-482页

作者： Yoritaka Iwata gsi helmholtzzentrum für schwerionenforschung Darmstadt Germany

Charge equilibration has been recognized as a dominant process at the early stage of low-energy heavy-ion reactions. The production of exotic nuclei is suppressed under the appearance of charge equilibration, in which the proton-neutron ratios of the final reaction products are inevitably averaged. Therefore charge equilibration plays one of the most crucial roles in the synthesis of chemical elements. focusing on how and when the charge equilibration takes place, zero sound propagation in femto-scale quantum liquids is explained.

关键词： Quantum Liquids Charge Equilibration

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

Synchronized off-harmonic probe laser with highly variable pulse duration for laser-plasma interaction experiments

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High Power Laser Science and Engineering 2024年第1期12卷 99-107页

作者： J.Hornung Y.Zobus H.Lorenté C.Brabetz B.Zielbauer V.Bagnoud gsi helmholtzzentrum für schwerionenforschung gmbh DarmstadtGermany Institut d’Optique UniversitéParis-SaclayPalaiseauFrance Institut für Angewandte Physik Technische Universität DarmstadtDarmstadtGermany

This paper presents the development and experimental utilization of a synchronized off-harmonic laser system designed as a probe for ultra-intense laser±plasma interaction experiments. The system exhibits a novel seed-generation design,allowing for a variable pulse duration spanning over more than three orders of magnitude, from 3.45 picoseconds to 10 nanoseconds. This makes it suitable for various plasma diagnostics and visualization techniques. In a side-view configuration, the laser was employed for interferometry and streaked shadowgraphy of a laser-induced plasma while successfully suppressing the self-emission background of the laser±plasma interaction, resulting in a signal-to-self-emission ratio of 110 for this setup. These properties enable the probe to yield valuable insights into the plasma dynamics and interactions at the PHELIX facility and to be deployed at various laser facilities due to its easy-to-implement design.

关键词： interferometry laser-plasma interaction off-harmonic probe laser streaked shadowgraphy

Theory of X-ray Anisotropy and Polarization following the Dielectronic recombination of Initially Hydrogen-Like Ions

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Chinese Physics Letters 2013年第2期30卷 94-98页

作者： SHI Ying-Long DONG Chen-Zhong frITZSCHE Stephan ZHANG Deng-Hong XIE Lu-You Key Laboratory of Atomic and Molecular Physics&functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070 College of Physics and Information Science Tianshui Normal UniversityTianshui 741001 gsi helmholtzzentrum für schwerionenforschung Darmstadt D-64291Germany

The angular distribution and polarization of the x-ray photoemission of highly charged helium-like ions is studied following the K-LL dielectronic recombination of initially hydrogen-like *** is carried out within the framework of the density matrix theory combined with the multiconfiguration Dirac-fock *** is paid to magnetic sublevel alignment in the resonant intermediate state and to its nonuniform radiative decay *** is shown that the Breit interaction between the incident and target electrons plays a significant role for the alignment of the resonant state and thus causes a substantial change in the x-ray emission characteristic,when compared to the incorporation of only the(non-relativistic)Coulomb *** most prominent difference in alignment parameter is found in the 2s2p_(1/2) J=1 resonant state for a wide range of atomic numbers from 9 to *** this resonant state of helium-like ions,the Breit interaction becomes significant for ions with nuclear charge Z~30 already.

关键词： interaction. resonant alignment

Implementation of a phase plate for the generation of homogeneous focal-spot intensity distributions at the high-energy short-pulse laser facility PHELIX

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High Power Laser Science and Engineering 2019年第4期7卷 33-38页

作者： V.Bagnoud J.Hornung M.Afshari U.Eisenbarth C.Brabetz Z.Major B.Zielbauer gsi helmholtzzentrum fur schwerionenforschung gmbh Planckstrasse 164291 DarmstadtGermany Helmholtz Institute Jena Frobelstieg 307743 JenaGermany

We propose and demonstrate the use of random phase plates(rPPs)for high-energy sub-picosecond *** to previous work related to nanosecond lasers,an rPP poses technical challenges with ultrashort-pulse ***,we implement the rPP near the beginning of the amplifier and image-relay it throughout the laser *** this,we obtain a uniform intensity distribution in the focus over an area 1600 times the diffraction *** method shows no significant drawbacks for the laser and it has been implemented at the PHELIX laser facility where it is now available for users.

关键词： beam shaping high-power laser phase plate short-pulse laser