Laboratory astroparticle physics

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Equilibration dynamics and conductivity of warm dense hydrogen

Physical Review E American Physical Society (APS) 90:1 (2014) 013104

Authors:

U Zastrau, P Sperling, A Becker, T Bornath, R Bredow, T Döppner, S Dziarzhytski, T Fennel, LB Fletcher, E Förster, C Fortmann, SH Glenzer, S Göde, G Gregori, M Harmand, V Hilbert, B Holst, T Laarmann, HJ Lee, T Ma, JP Mithen, R Mitzner, CD Murphy, M Nakatsutsumi, P Neumayer, A Przystawik, S Roling, M Schulz, B Siemer, S Skruszewicz, J Tiggesbäumker, S Toleikis, T Tschentscher, T White, M Wöstmann, H Zacharias, R Redmer
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Turbulent amplification of magnetic fields in laboratory laser-produced shock waves

Nature Physics Springer Nature 10:7 (2014) 520-524

Authors:

J Meinecke, HW Doyle, F Miniati, AR Bell, R Bingham, R Crowston, RP Drake, M Fatenejad, M Koenig, Y Kuramitsu, C C. Kuranz, DQ Lamb, D Lee, MJ MacDonald, CD Murphy, H-S Park, A Pelka, A Ravasio, Y Sakawa, AA Schekochihin, A Scopatz, P Tzeferacos, WC Wan, NC Woolsey, R Yurchak, B Reville, G Gregori
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Evidence for a glassy state in strongly driven carbon

Scientific Reports Springer Nature 4 (2014) 5214

Authors:

CRD Brown, M Cammarata, BI Cho, T Döppner, K Engelhorn, E Förster, C Fortmann, D Fritz, E Galtier, SH Glenzer, M Harmand, P Heimann, NL Kugland, DQ Lamb, HJ Lee, RW Lee, H Lemke, M Makita, A Moinard, CD Murphy, B Nagler, P Neumayer, K-U Plagemann, R Redmer

Abstract:

Here, we report results of an experiment creating a transient, highly correlated carbon state using a combination of optical and x-ray lasers. Scattered x-rays reveal a highly ordered state with an electrostatic energy significantly exceeding the thermal energy of the ions. Strong Coulomb forces are predicted to induce nucleation into a crystalline ion structure within a few picoseconds. However, we observe no evidence of such phase transition after several tens of picoseconds but strong indications for an over-correlated fluid state. The experiment suggests a much slower nucleation and points to an intermediate glassy state where the ions are frozen close to their original positions in the fluid.
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Observations of strong ion-ion correlations in dense plasmasa)

Physics of Plasmas AIP Publishing 21:5 (2014) 056302

Authors:

T Ma, L Fletcher, A Pak, DA Chapman, RW Falcone, C Fortmann, E Galtier, DO Gericke, G Gregori, J Hastings, OL Landen, S Le Pape, HJ Lee, B Nagler, P Neumayer, D Turnbull, J Vorberger, TG White, K Wünsch, U Zastrau, SH Glenzer, T Döppner
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Electron-ion equilibration in ultrafast heated graphite.

Physical review letters 112:14 (2014) 145005

Authors:

TG White, NJ Hartley, B Borm, BJB Crowley, JWO Harris, DC Hochhaus, T Kaempfer, K Li, P Neumayer, LK Pattison, F Pfeifer, S Richardson, APL Robinson, I Uschmann, G Gregori

Abstract:

We have employed fast electrons produced by intense laser illumination to isochorically heat thermal electrons in solid density carbon to temperatures of ∼10,000  K. Using time-resolved x-ray diffraction, the temperature evolution of the lattice ions is obtained through the Debye-Waller effect, and this directly relates to the electron-ion equilibration rate. This is shown to be considerably lower than predicted from ideal plasma models. We attribute this to strong ion coupling screening the electron-ion interaction.
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