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Article Dans Une Revue Journal of Physics B: Atomic, Molecular and Optical Physics Année : 2010

Probing near-solid density plasmas using soft x-ray scattering

T Bornath
  • Fonction : Auteur
S Göde
  • Fonction : Auteur
R Irsig
  • Fonction : Auteur
B Li
  • Fonction : Auteur
P Radcliffe
  • Fonction : Auteur
R Redmer
  • Fonction : Auteur
H Reinholz
  • Fonction : Auteur
G Röpke
  • Fonction : Auteur
R Thiele
  • Fonction : Auteur

Résumé

X-ray scattering using highly brilliant X-ray free-electron laser (FEL) radiation provides a new access to probe free electron density, temperature and ionization in near-solid density plasmas. First experiments at the soft X-ray FEL FLASH at DESY, Hamburg, show the capabilities of this technique. The ultrashort FEL pulses in particular can probe equilibration phenomena occurring after excitation of the plasma using ultrashort optical laser pumping. We have investigated liquid hydrogen and find that the interaction of very intense soft X-ray FEL radiation alone heats the sample volume. As the plasma establishes, photons from the same pulse undergo scattering, thus probing the transient, warm dense matter state. We find a free electron density of (2.6 ± 0.2) · 10 20 cm −3 and an electron temperature of 14 ± 3.5 eV. In pump-probe experiments, using intense optical laser pulses to generate more extreme states of matter, this interaction of the probe pulse has to be considered in the interpretation of scattering data. In this paper we present details of the experimental setup at FLASH and the diagnostic methods used to quantitatively analyze the data. Probing near-solid density plasmas using soft X-ray scattering 2 Plasma production and heating by laser beams Probing near-solid density plasmas using soft X-ray scattering 3
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Dates et versions

hal-00569850 , version 1 (25-02-2011)

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S Toleikis, T Bornath, T Döppner, S Düsterer, R R Fäustlin, et al.. Probing near-solid density plasmas using soft x-ray scattering. Journal of Physics B: Atomic, Molecular and Optical Physics, 2010, 43 (19), pp.194017. ⟨10.1088/0953-4075/43/19/194017⟩. ⟨hal-00569850⟩

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