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8Complex Systems of Charged Particles and their Interactions with Electromagnetic Radiation 2019
IONIC CHARGE STATE DISTRIBUTION IN DENSE NON-MAXWELLIAN PLASMAS
F.B. Rosmej12
1Sorbonne University, Faculty of Sciences, Paris, France, Ecole Polytechnique, Palaiseau, France e-mail: frankrosmej@,sorbonne-universite.fr
Suprathermal electrons are routinely excited in high-intensity laser produced plasmas via instabilities driven by non-linear laser-plasma interaction. Their accurate characterization is crucial for the performance of inertial confinement fusion as well as astrophysical and in general high-energy density experiments. Here, studies of non-thermal atomic states in dense plasmas are presented to characterize suprathermal electron population inside the target/dense plasma with respect to their fraction and time evolution.
The analysis is based on non-Maxwellian X-ray spectroscopy of autoionizing states and spectral simulations of the non-equilibrium radiative propoerties [1-3]. The spectral features of the highresolution X-ray data originating from several charge states demonstrate their potential to determine hot electron fraction and their temporal evolution thereby allowing to independently identifying the relevant mechanisms of hot electron generation [4]. Moreover, recent studies demonstrate [5], that space resolved X-ray spectroscopic analysis has also the potential to benchmark state-of-the-art multi-scale non-linear laser-plasma interaction hydrodynamic modeling that are exceedingly challenging.
Applications to ICF relevant hohlraum plasmas and ns kJ-laser produced plasmas are given. References
[1] O. Renner, F.B. Rosmej, Challenges of X-ray spectroscopy in investigations of matter under extreme conditions, Matter and Radiation at Extremes, Review, Vol. 4 (Issue 1), 024201 (2019).
[2] F.B. Rosmej, V.S. Lisitsa, V.A. Astapenko, Plasma Atomic Physics, Springer, ISBN 978-3-03005966-8, 650 pages, Heidelberg (2019).
[3] F.B. Rosmej, Hot Electron X-ray Diagnostics, Lett. J. Phys. B: At. Mol. Opt. Phys. 30, L819 (1997).
[4] S.H. Glenzer, F.B. Rosmej, R.W. Lee, C.A. Back, KG. Estabrook, B.J. MacCowan, T.D. Shepard, R.E. Turner, Measurements of suprathermal electrons in hohlraum plasmas with X-ray spectroscopy, Phys. Rev. Lett. 81, 365 (1998).
[5] M. Smid, O. Renner, A. Colaitis, V.T. Tikhonchuk, T. Schlegel, F.B. Rosmej, Characterization of suprathermal electrons inside laser accelerated solid density matter via axially-resolved K-emission, submitted (2019).
