Oxford Centre for High Energy Density Science (OxCHEDS)

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Measurement of the dynamic response of compressed hydrogen by inelastic X-ray scattering

Journal of Physics Conference Series IOP Publishing 244:4 (2010) 042014

Authors:

K Falk, AP Jephcoat, BJB Crowley, RR Fäustlin, C Fortmann, FY Khattak, AK Kleppe, D Riley, S Toleikis, J Wark, H Wilhelm, G Gregori
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Nanosecond x-ray Laue diffraction apparatus suitable for laser shock compression experiments

Review of Scientific Instruments AIP Publishing 81:8 (2010) 083902

Authors:

Matthew Suggit, Giles Kimminau, James Hawreliak, Bruce Remington, Nigel Park, Justin Wark
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XUV emission from autoionizing hole states induced by intense XUV-FEL at intensities up to 1017 W/cm2

Journal of Physics Conference Series IOP Publishing 244:4 (2010) 042028

Authors:

FB Rosmej, E Galtier, D Riley, T Dzelzainis, P Heinmann, FY Khattak, RW Lee, B Nagler, A Nelson, T Tschentscher, SM Vinko, T Whitcher, S Toleikis, R Fäustlin, R Soberierski, L Juha, M Fajardo, JS Wark, J Chalupsky, V Hajkova, J Krzywinski, M Jurek, M Kozlova
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Micron-scale fast electron filaments and recirculation determined from rear-side optical emission in high-intensity laser-solid interactions

New Journal of Physics 12 (2010)

Authors:

C Bellei, SR Nagel, S Kar, A Henig, S Kneip, C Palmer, A Sävert, L Willingale, D Carroll, B Dromey, JS Green, K Markey, P Simpson, RJ Clarke, H Lowe, D Neely, C Spindloe, M Tolley, MC Kaluza, SPD Mangles, P McKenna, PA Norreys, J Schreiber, M Zepf, JR Davies, K Krushelnick, Z Najmudin

Abstract:

The transport of relativistic electrons generated in the interaction of petawatt class lasers with solid targets has been studied through measurements of the second harmonic optical emission from their rear surface. The high degree of polarization of the emission indicates that it is predominantly optical transition radiation (TR). A halo that surrounds the main region of emission is also polarized and is attributed to the effect of electron recirculation. The variation of the polarization state and intensity of radiation with the angle of observation indicates that the emission of TR is highly directional and provides evidence for the presence of μm-size filaments. A brief discussion on the possible causes of such a fine electron beam structure is given. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
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Relativistic quasimonoenergetic positron jets from intense laser-solid interactions.

Phys Rev Lett 105:1 (2010) 015003

Authors:

Hui Chen, SC Wilks, DD Meyerhofer, J Bonlie, CD Chen, SN Chen, C Courtois, L Elberson, G Gregori, W Kruer, O Landoas, J Mithen, J Myatt, CD Murphy, P Nilson, D Price, M Schneider, R Shepherd, C Stoeckl, M Tabak, R Tommasini, P Beiersdorfer

Abstract:

Detailed angle and energy resolved measurements of positrons ejected from the back of a gold target that was irradiated with an intense picosecond duration laser pulse reveal that the positrons are ejected in a collimated relativistic jet. The laser-positron energy conversion efficiency is ∼2×10{-4}. The jets have ∼20 degree angular divergence and the energy distributions are quasimonoenergetic with energy of 4 to 20 MeV and a beam temperature of ∼1  MeV. The sheath electric field on the surface of the target is shown to determine the positron energy. The positron angular and energy distribution is controlled by varying the sheath field, through the laser conditions and target geometry.
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