Oxford Centre for High Energy Density Science (OxCHEDS)

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Single Hit Energy-resolved Laue Diffraction

(2015)

Authors:

Shamim Patel, Matthew J Suggit, Paul G Stubley, James A Hawreliak, Orlando Ciricosta, Andrew J Comley, Gilbert W Collins, Jon H Eggert, John M Foster, Justin S Wark, Andrew Higginbotham
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Simulation of density measurements in plasma wakefields using photon acceleration

Physical Review Accelerators and Beams American Physical Society (APS) 18:3 (2015) 032801

Authors:

Muhammad Firmansyah Kasim, Naren Ratan, Luke Ceurvorst, James Sadler, Philip N Burrows, Raoul Trines, James Holloway, Matthew Wing, Robert Bingham, Peter Norreys
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The creation of large-volume, gradient-free warm dense matter with an x-ray free-electron laser

Physics of Plasmas AIP Publishing 22:3 (2015) 030703

Authors:

A Lévy, P Audebert, R Shepherd, J Dunn, M Cammarata, O Ciricosta, F Deneuville, F Dorchies, M Fajardo, C Fourment, D Fritz, J Fuchs, J Gaudin, M Gauthier, A Graf, HJ Lee, H Lemke, B Nagler, J Park, O Peyrusse, AB Steel, SM Vinko, JS Wark, GO Williams, D Zhu, RW Lee
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Electron-ion temperature equilibration in warm dense tantalum

High Energy Density Physics Elsevier 14 (2015) 1-5

Authors:

NJ Hartley, P Belancourt, DA Chapman, T Döppner, RP Drake, DO Gericke, SH Glenzer, D Khaghani, S LePape, T Ma, P Neumayer, A Pak, L Peters, S Richardson, J Vorberger, TG White, G Gregori
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Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma.

Nature communications 6 (2015) 6397

Authors:

SM Vinko, O Ciricosta, TR Preston, DS Rackstraw, CRD Brown, T Burian, J Chalupský, BI Cho, H-K Chung, K Engelhorn, RW Falcone, R Fiokovinini, V Hájková, PA Heimann, L Juha, HJ Lee, RW Lee, M Messerschmidt, B Nagler, W Schlotter, JJ Turner, L Vysin, U Zastrau, JS Wark

Abstract:

The rate at which atoms and ions within a plasma are further ionized by collisions with the free electrons is a fundamental parameter that dictates the dynamics of plasma systems at intermediate and high densities. While collision rates are well known experimentally in a few dilute systems, similar measurements for nonideal plasmas at densities approaching or exceeding those of solids remain elusive. Here we describe a spectroscopic method to study collision rates in solid-density aluminium plasmas created and diagnosed using the Linac Coherent light Source free-electron X-ray laser, tuned to specific interaction pathways around the absorption edges of ionic charge states. We estimate the rate of collisional ionization in solid-density aluminium plasmas at temperatures ~30 eV to be several times higher than that predicted by standard semiempirical models.
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