Experimental discrimination of ion stopping models near the Bragg peak in highly ionized matter

Cayzac, W.; Frank, A.; Ortner, A.; Bagnoud, V.; Basko, M. M.; Bedacht, S.; Bläser, C.; Blažević, A.; Busold, S.; Deppert, O.; Ding, J.; Ehret, M.; Fiala, Patrick; Frydrych, S.; Gericke, Dirk O.; Hallo, L.; Helfrich, John P.; Jahn, D.; Kjartansson, E.; Knetsch, A.; Kraus, D.; Malka, G.; Neumann, Nico W.; Pépitone, K.; Pepler, D.; Sander, Stephan; Schaumann, G.; Schlegel, T.; Schroeter, N.; Schumacher, Dennis; Seibert, M. Marvin; Tauschwitz, A.; Vorberger, Jan; Wagner, F.; Weih, Simon; Zobus, Y.; Roth, Markus

doi:10.1038/ncomms15693

Cited by 79 publications

(76 citation statements)

References 31 publications

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“…Consequently, the LFC is of paramount importance to incorporate nonlocal exchange-correlation effects into other theories, like QHD [87,88,132], effective potentials [3,[133][134][135][136][137][138], and the construction of advanced exchange-correlation functionals for DFT [139][140][141][142] and time-dependent DFT [69]. Moreover, it can directly be used to compute important material properties like the stopping power [143][144][145], electrical and thermal conductivities [146,147], and energy transfer rates [148]. Finally, we mention the interpretation of XRTS experiments [149][150][151][152][153], e.g., within the Chihara decomposition [154], which is of paramount importance as a method of diagnostics.…”

Section: B Summary Of Ab Initio Results For the Static Local Field Cmentioning

confidence: 99%

Ab initio simulation of warm dense matter

et al. 2020

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Warm dense matter (WDM) -an exotic state of highly compressed matter -has attracted high interest in recent years in astrophysics and for dense laboratory systems. At the same time, this state is extremely difficult to treat theoretically. This is due to the simultaneous appearance of quantum degeneracy, Coulomb correlations and thermal effects, as well as the overlap of plasma and condensed phases. Recent breakthroughs are due to the successful application of density functional theory (DFT) methods which, however, often lack the necessary accuracy and predictive capability for WDM applications. The situation has changed with the availability of the first ab initio data for the exchange-correlation free energy of the warm dense uniform electron gas (UEG) that were obtained by quantum Monte Carlo (QMC) simulations, for recent reviews, see Dornheim et al., Phys. Plasmas 24, 056303 (2017) and Phys. Rep. 744, 1-86 (2018). In the present article we review recent further progress in QMC simulations of the warm dense UEG: namely, ab initio results for the static local field correction G(q) and for the dynamic structure factor S(q, ω). These data are of key relevance for the comparison with x-ray scattering experiments at free electron laser facilities and for the improvement of theoretical models.In the second part of this paper we discuss simulations of WDM out of equilibrium. The theoretical approaches include Born-Oppenheimer molecular dynamics, quantum kinetic theory, timedependent DFT and hydrodynamics. Here we analyze strengths and limitations of these methods and argue that progress in WDM simulations will require a suitable combination of all methods. A particular role might be played by quantum hydrodynamics, and we concentrate on problems, recent progress, and possible improvements of this method.

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Section: B Summary Of Ab Initio Results For the Static Local Field Cmentioning

confidence: 99%

Ab initio simulation of warm dense matter

et al. 2020

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“…Consequently, finding an accurate theory for the LFC has been a long-standing problem for decades [34,35]. Such information is crucial for * t.dornheim@hzdr.de many applications, including the interpretation of experiments [36][37][38][39][40], the construction of effective, electronically screened potentials [41][42][43], the development of advanced functionals for DFT [44][45][46][47], the incorporation of electronic correlations into quantum hydrodynamics [48][49][50], and the calculation of other material properties like electrical and thermal conductivities [51,52], stopping power [53,54], and energy transfer rates [55].…”

Section: Introductionmentioning

confidence: 99%

The static local field correction of the warm dense electron gas: An ab initio path integral Monte Carlo study and machine learning representation

Dornheim

Vorberger

Groth

et al. 2019

The Journal of Chemical Physics

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204

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The study of matter at extreme densities and temperatures as they occur in astrophysical objects and state-of-the art experiments with high-intensity lasers is of high current interest for many applications. While no overarching theory for this regime exists, accurate data for the density response of correlated electrons to an external perturbation are of paramount importance. In this context, the key quantity is given by the local field correction (LFC), which provides a wave-vector resolved description of exchange-correlation effects. In this work, we present extensive new path integral Monte Carlo (PIMC) results for the static LFC of the uniform electron gas, which are subsequently used to train a fully connected deep neural network. This allows us to present a continuous representation of the LFC with respect to wave-vector, density, and temperature covering the entire warm dense matter regime. Both the PIMC data and neural-net results are available online. Moreover, we expect the presented combination of ab initio calculations with machinelearning methods to be a promising strategy for many applications.

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“…Former similar experiments performed either slow-ion/slow-ion [14][15][16] or fast-ion/plasma-discharge collisions [18][19][20] . To be able to carry out crossed-beam experiments at different facilities, including the S 3 beamline at GANIL 21,22 or storage rings such as CRYRING@ESR 23 located at the upcoming FAIR facility, a compact and versatile setup providing a pure ion beam of highly charged low energy ions is needed.…”

Section: Introductionmentioning

confidence: 99%

An electrostatic in-line charge-state purification system for multicharged ions in the kiloelectronvolt energy range

Schury

Kumar

Méry

et al. 2019

Review of Scientific Instruments

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The performance of a newly built omega type electrostatic analyzer designed to act as an in-line charge-state purification system for ions in the keV energy range is reported. The analyzer consists of a set of four consecutive electrostatic °concentric cylindrical electrodes enclosed by Matsuda electrodes. This setup was recently tested and validated using O 5+ , Ar 9+ and Xe 20+ ion beams at an energy of  qkeV at the ARIBE facility. A resolving power of . and a transmission of  % of the desired charge state are measured allowing a good purification of incoming ion beams with charge states up to 10+ and a fairly good purification for charge states at least up to 20+. In comparison with other in-line solutions such as Wien filter, our system has the advantage of being purely electrostatic and therefore lacking common drawbacks as for example hysteresis.

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Experimental discrimination of ion stopping models near the Bragg peak in highly ionized matter

Cited by 79 publications

References 31 publications

Ab initio simulation of warm dense matter

Ab initio simulation of warm dense matter

The static local field correction of the warm dense electron gas: An ab initio path integral Monte Carlo study and machine learning representation

An electrostatic in-line charge-state purification system for multicharged ions in the kiloelectronvolt energy range

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