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Proton stopping power measurements in warm dense matter at low velocity projectile ratio

ORAL · Invited

Abstract

Ion stopping power in high energy density (HED) plasmas is of great interest for fundamental science and is important in many areas of inertial confinement fusion, including central hot spot ignition, fast ignition, and heavy ion fusion. Theoretical modelling of ion stopping power in HED plasmas is a difficult task and there is little experimental data to validate and benchmark models, contributing to large discrepancies amongst them. The modelling of stopping power in Warm Dense Matter (WDM) is particularly challenging due to electron degeneracy and coupling, which modify the Coulomb logarithm characterizing the collisions in the plasma. While a number of experimental studies have been performed on ion stopping power in classical plasmas, experimental database in WDM is essentially missing. In addition, the low velocity stopping power regime where vp (ion velocity) ~ vth (electron thermal velocity) remains virtually unexplored.

Here, we report the first proton energy loss measurements in warm dense plasma at low projectile velocities vp/ vth ≈ 3-10 [1]. The experiment was performed at CLPU VEGA-II laser facility by using a novel high repetition rate platform [2]. The platform is based on the energy selection of a quasi-monoenergetic, short time-duration, proton beam of 500 keV from a broadband proton spectrum. A WDM with a temperature of around 10 eV was generated by femtosecond laser-heating of a thin carbon foil and characterized using two independent spectroscopy diagnostics. Our energy-loss data demonstrate a significant deviation of the stopping power from classical models in this regime. In particular, we show that our results are in closest agreement with recent first-principles simulations based on time-dependent density functional theory [3,4].

[1] S. Malko et al, Nat. Commun.13, 2893 (2022)

[2] J. Apiñaniz et al. Sci. Rep. 11, 6881 (2021)

[3] A. J. White et al., Phys. Rev. B 98, 144302 (2018)

[4] A. J. White et al., Phys. Rev. Lett. 125, 055002 (2020)

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Publication: S. Malko et al, Nat. Commun.13, 2893 (2022)<br>J. Apiñaniz et al. Sci. Rep. 11, 6881 (2021)<br>V. Ospina-Bohorquez et al. manuscript in preparation for submission to HPSLE

Presenters

  • Sophia Malko

    Princeton Plasma Physics Laboratory

Authors

  • Sophia Malko

    Princeton Plasma Physics Laboratory

  • Witold CAYZAC

    CEA DAM lle-de-France, CEA

  • Valeria Ospina-Bohorquez

    CEA, DAM, University of Bordeaux, University of Salamanca, CEA

  • Krish A Bhutwala

    University of California, San Diego

  • Mathieu Bailly-Grandvaux

    University of California, San Diego

  • Christopher McGuffey

    University of California, San Diego

  • R Fedosejevs

    University of Alberta, Univ of Alberta

  • Xavier Vaisseau

    CEA DAM lle-de-France, CEA DAM Ile-De-France, CEA, DAM, DIF, F-91297 Arpajon, France, CEA

  • Anna Tauschwitz

    Frankfurt University, Frankfurt, Germany

  • Jon Imanol I Apiñaniz Aguinaco

    Centro de Láseres Pulsados (CLPU), Centro de Laseres Pulsados (CLPU), Salamanca, Spain.

  • Diego De Luis

    CLPU

  • Giancarlo Gatti

    CLPU

  • Marine Huault

    Centros Laseres Pulsados Ultraintensos (CLPU), CLPU

  • Jose-Antonio Perez-Hernandez

    Centro de Láseres Pulsados (CLPU), CLPU

  • Suxing Hu

    Laboratory for Laser Energetics, University of Rochester, LLE, University of Rochester, Lab. for Laser Energetics, U. of Rochester

  • Alexander J White

    Los Alamos Natl Lab

  • Lee A Collins

    Los Alamos Natl Lab, Los Alamos National Laboratory

  • Katarina A Nichols

    Laboratory for Laser Energetics, University of Rochester, University of Rochester

  • Paul Neumayer

    GSI Helmholtzzentrum für Schwerionenforschung, Germany, GSI Helmholtz Centre for Heavy Ion Research, GSI Helmholtzzentrum für Schwerionenforschung, GSI

  • Gerald Faussurier

    CEA

  • Jan Vorberger

    Helmholtz Zentrum Dresden-Rossendorf

  • William R Fox

    Princeton Plasma Physics Laboratory

  • Brooklyn Frances Kraus

    Princeton Plasma Physics Laboratory, PPPL

  • Derek B Schaeffer

    Princeton University

  • Giuseppe Prestopino

    Universit`a di Roma, Rome, Italy

  • Claudio Verona

    Universit`a di Roma, Rome, Italy

  • Joao J Santos

    University of Bordeaux

  • Farhat N Beg

    University of California, San Diego

  • Dimitri Batani

    CELIA, University Bordeaux, University of Bordeaux, France

  • Luis Roso

    Centro de Láseres Pulsados (CLPU), Centros Laseres Pulsados Ultraintensos (CLPU), CLPU

  • Luca Volpe

    CLPU