Professor Justin Wark: Publications

XUV emission from autoionizing hole states induced by intense XUV-FEL at intensities up to 1017 W/cm2

Journal of Physics Conference Series 244:PART 4 (2010)

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

Abstract:

Aluminium targets were irradiated with 92 eV radiation from FLASH Free Electron Laser at DESY at intensities up to 10¹⁷ W/cm² by focussing the beam on target down to a spot size of ∼1 μm by means of a parabolic mirror. High resolution XUV spectroscopy was used to identify aluminium emission from complex hole-states. Simulations carried out with the MARIA code show that the emission characterizes the electron heating in the transition phase solid-atomic. The analysis allows constructing a simple model of electron heating via Auger electrons. © 2010 IOP Publishing Ltd.

Bragg diffraction using a 100 ps 17.5 keV x-ray backlighter and the Bragg diffraction imager

REVIEW OF SCIENTIFIC INSTRUMENTS 81:10 (2010) ARTN 10E522

Authors:

BR Maddox, H-S Park, J Hawreliak, A Elsholz, R Van Maren, BA Remington, A Comley, JS Wark

Metal deformation and phase transitions at extremely high strain rates

MRS BULLETIN 35:12 (2010) 999-1006

Authors:

RE Rudd, TC Germann, BA Remington, JS Wark

Phonon instabilities in uniaxially compressed fcc metals as seen in molecular dynamics simulations

PHYSICAL REVIEW B 81:9 (2010) ARTN 092102

Authors:

Giles Kimminau, Paul Erhart, Eduardo M Bringa, Bruce Remington, Justin S Wark

Radiation emission of autoionising hole states of Al induced by XUV free electron laser radiation with FLASH at DESY

36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts 33 E1 (2009) 569-572

Authors:

E Galtier, FB Rosmej, D Riley, T Dzelzainis, P Heinmann, FY Khattak, RW Lee, B Nagler, A Nelson, T Tschentscher, SM Vinko, T Whitcher, S Toleikis, R Fäustlin, L Juha, M Fajardo, JS Wark, J Chalupsky, V Hajkova, J Krzywinski, R Soberierski, M Jurek, M Kozlova

Abstract:

The analysis of the radiative properties of plasmas created by XUV and X-ray free electron laser radiations provides a tremendous challenge to researchers to investigate matter under extreme conditions. In the present work we report about the theoretical analysis of the radiation emission of Al heated by the interaction of 10 fs focused (1 μm) free electron laser radiation at 13.5 nm at intensities of about 1016 W/cm2. The data show strong resonance line emission 3l -2l′ from Ne-like Al but also numerous intense broad emission structures in the spectral range from 10-30 nm. Atomic structure analysis indicate that these emission structures might originate from multiple excited states with L-holes. By means of a genetic algorithm we analyze possible excitation channels driven directly by the FLASH free electron laser as well as by heated plasma electrons.

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