https://doi.org/10.1140/epjd/e2006-00126-y
Possibility of plasma density diagnostics using Langmuir-wave-caused dips observed in dense laser plasmas
1
Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany
2
Institute of Physics, Academy of Sciences CR, Na Slovance 2, 18221 Prague, Czech Republic
3
Physique Atomique dans les Plasmas Denses, Laboratoire pour l'Utilisation des Lasers Intenses, CNRS-École Polytechnique-CEA-Université Paris VI, 75252 Paris Cedex 05 and, 91128 Palaiseau Cedex, France
Received:
2
November
2005
Revised:
20
March
2006
Published online:
13
June
2006
A systematic study of the Langmuir-wave-caused dips (L dips) observed in profiles of the Al Ly γ line emitted from laser irradiated sandwich targets indicates that these fine spectral features can be used as a tool for density diagnostics in intermediately coupled plasmas. The spectroscopic data required for a reliable identification of L dips were collected by a vertical-geometry Johann spectrometer providing high spectral and spatial resolution. The electron densities deduced from the evolution of the L dips along the laser target axis compare well with those derived from hydrosimulations and from measurements of the line widths and shifts.
PACS: 32.70.Jz – Line shapes, widths, and shifts / 52.70.La – X-ray and gamma-ray measurements
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006
