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Nanosecond Imaging of Shock- and Jet-Like Features

IEEE Transactions on Plasma Science Institute of Electrical and Electronics Engineers (IEEE) 42:10 (2014) 2496-2497

Authors:

Eleanor R Tubman, Robert Crowston, Reem Alraddadi, Hugo W Doyle, Jena Meinecke, Joseph E Cross, Riccardo Bolis, Donald Lamb, Petros Tzeferacos, Domenico Doria, Brian Reville, Hamad Ahmed, Marco Borghesi, Gianluca Gregori, Nigel C Woolsey
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Enhanced proton beam collimation in the ultra-intense short pulse regime

Plasma Physics and Controlled Fusion IOP Publishing 56:8 (2014) 084001

Authors:

JS Green, NP Dover, M Borghesi, CM Brenner, FH Cameron, DC Carroll, PS Foster, P Gallegos, G Gregori, P McKenna, CD Murphy, Z Najmudin, CAJ Palmer, R Prasad, L Romagnani, KE Quinn, J Schreiber, MJV Streeter, S Ter-Avetisyan, O Tresca, M Zepf, D Neely
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Nanosecond Imaging of Shock- and Jet-Like Features

IEEE Transactions on Plasma Science (2014)

Authors:

ER Tubman, R Crowston, R Alraddadi, HW Doyle, J Meinecke, JE Cross, R Bolis, D Lamb, P Tzeferacos, D Doria, B Reville, H Ahmed, M Borghesi, G Gregori, NC Woolsey

Abstract:

The production of shock- and collimated jet-like features is recorded from the self-emission of a plasma using a 16- frame camera, which can show the progression of the interaction over short (100s ns) durations. A cluster of laser beams, with intensity 10¹⁵$ W/cm², was focused onto a planar aluminum foil to produce a plasma that expanded into 0.7 mbar of argon gas. The acquisition of 16 ultrafast images on a single shot allows prompt spatial and temporal characterization of the plasma and enables the velocity of the jet- and shock-like features to be calculated.
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Electron-phonon equilibration in laser-heated gold films

Physical Review B American Physical Society (APS) 90:1 (2014) 014305

Authors:

TG White, P Mabey, DO Gericke, NJ Hartley, HW Doyle, D McGonegle, DS Rackstraw, A Higginbotham, G Gregori
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Equilibration dynamics and conductivity of warm dense hydrogen.

Physical review. E, Statistical, nonlinear, and soft matter physics 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

Abstract:

We investigate subpicosecond dynamics of warm dense hydrogen at the XUV free-electron laser facility (FLASH) at DESY (Hamburg). Ultrafast impulsive electron heating is initiated by a ≤ 300-fs short x-ray burst of 92-eV photon energy. A second pulse probes the sample via x-ray scattering at jitter-free variable time delay. We show that the initial molecular structure dissociates within (0.9 ± 0.2) ps, allowing us to infer the energy transfer rate between electrons and ions. We evaluate Saha and Thomas-Fermi ionization models in radiation hydrodynamics simulations, predicting plasma parameters that are subsequently used to calculate the static structure factor. A conductivity model for partially ionized plasma is validated by two-temperature density-functional theory coupled to molecular dynamic simulations and agrees with the experimental data. Our results provide important insights and the needed experimental data on transport properties of dense plasmas.
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