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Spectrally resolved X-ray scatter from laser-shock-driven plasmas

Published online by Cambridge University Press:  20 July 2007

D. Riley
Affiliation:
School of Mathematics and Physics, Queen's University Belfast, Belfast, United Kingdom
F.Y. Khattak
Affiliation:
School of Mathematics and Physics, Queen's University Belfast, Belfast, United Kingdom
E. Garcia Saiz
Affiliation:
School of Mathematics and Physics, Queen's University Belfast, Belfast, United Kingdom
G. Gregori
Affiliation:
CCLRC Rutherford Appleton Laboratory, Oxon, United Kingdom Clarendon Laboratory, University of Oxford, Oxford, United Kingdom
S. Bandyopadhyay
Affiliation:
CCLRC Rutherford Appleton Laboratory, Oxon, United Kingdom
M. Notley
Affiliation:
CCLRC Rutherford Appleton Laboratory, Oxon, United Kingdom
D. Neely
Affiliation:
CCLRC Rutherford Appleton Laboratory, Oxon, United Kingdom
D. Chambers
Affiliation:
AWE plc, Reading, Berks, United Kingdom
A. Moore
Affiliation:
AWE plc, Reading, Berks, United Kingdom
A. Comley
Affiliation:
AWE plc, Reading, Berks, United Kingdom

Abstract

We report spectrally resolved X-ray scattering data from shock compressed foils illustrating the feasibility of X-ray Thomson scattering experiment on a sub-kilo joule laser system. Sandwich targets consisting of CH/Al/CH were shock compressed using ∼1 ns laser pulses. Separate 270 ps laser pulses were used to generate an intense source of Ti-He-α (1s2-1s2p1P) radiation which was used as a probing source of 4.75 keV photons. The spectrum of scattered photons was recorded at a scattering angle of 82° with a CCD fitted spectrometer using a PET crystal in von-Hamos geometry. Although spectral resolution was used to separate the scatter from any background, the resolution was limited by source broadening. The relative level of scatter at different times in the sample history was measured by varying the delay between the shock driving beams and the back-lighter beams. We have compared the scatter spectra with simulations based on two different models of the L-shell bound-free contribution.

Type
Research Article
Copyright
© 2007 Cambridge University Press

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