Link do seminarium: https://bit.ly/3GcAlNF

K. Batani¹, D. Batani^2,3, S. Malko⁴, M. Touati⁵, A.D. Lad⁶, D. Khaghani², D. Mancelli², D. Raffestin², J.J. Santos², A. Tentori², O. Turianska², Ph. Nicolai², J.L. Feugeas², J.A. Perez-Hernandez⁵, G. Zeraouli⁵, L. Volpe⁵, K. Jana⁶, G.R. Kumar⁶, R. Benocci⁷, A.S. Martynenko⁸, S.A. Pikuz^3,8, D. Pacella⁹, G. Claps⁹, F. Cordella⁹, V. Narayanan¹⁰

1) IPPLM, Warsaw, Poland
2) University of Bordeaux, CELIA, Bordeaux, France
3) NRNY MEPhI, Moscow, Russia
4) Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ, USA
5) Centro de Laseres Pulsados (CLPU), Salamanca, Spain
6) Tata Institute of Fundamental Research, Mumbai, India
7) University of Milano Bicocca, Italy
8) JIHT RAS, Moscow, Russia
9) ENEA, Frascati, Italy
10) Indian Institute of Technology Jodhpur, India

The investigation of the generation of very strong shocks (initial pressures larger than 100 Mbar) [1,2] in solid density matter is important for developing a platform for diagnosing matter in extreme pressure conditions which are relevant for shock ignition conditions [3,4]. Here we report an experimental campaign, performed at the CLPU VEGA – II laser facility, and LOA Palaiseau focused on studying the dynamics of shock produced by fs-laser via the energy deposition from hot electrons generated in laser-matter interactions. Due to the short laser pulse duration, pressure is not maintained in time and the shock takes the form of a blast wave.

In presented experiments, solid-density targets of aluminum and CH of various thicknesses were irradiated by the fs-lasers and a full characterization of the blast wave formation and propagation was performed using several diagnostics. X-ray emission was detected by using a bremsstrahlung cannon and Kirkpatrick-Baez. Together with electron spectrometers they provided information about hot electron temperature. Optical diagnostics (shock chronometry [5]) provided information on the propagation of the blast wave in solids. Doppler reflectometry [6] provided information on the state of the target rear surface.

The preliminary analysis of experimental results confirms the generation of a blast wave which is initially very strong and very rapidly decaying in time, confirming the estimations predicted by radiation magnetohydrodynamic, hybrid Vlasov-Fokker-Planck and particle-in-cell simulations.

[1] J.J. Santos, et al., New J. Phys., 19, 103005 (2017)
[2] K. Jakubowska, et al., Europhysics Letters, 119, 35001 (2017)
[3] L.J. Perkins, et al., Phys. Rev. Lett., 103, 045004 (2009)
[4] D. Batani, et al., Nuclear Fusion, 54, 054009 (2014)
[5] D. Batani, et al., Laser and Particle Beams, 14, 211 (1996)
[6] S. Mondal, et al., Phys. Rev. Lett., 105, 105002 (2010)