X-ray spectroscopy of super-intense laser-produced plasmas for the study of nonlinear processes. Comparison with PIC simulations

Dalimier, E. and Ya Faenov, A. and Oks, E. and Angelo, P. and Pikuz, T. A. and Fukuda, Yuji and Andreev, A and Koga, J. and Sakaki, H. and Kotaki, H. and Pirozhkov, A. and Hayashi, Y. and Skobelev, I. Yu. and Pikuz, S. A. and Kawachi, T. and Kando, M. and Kondo, K. and Zhidkov, A and Tubman, Eleanor and Butler, Nicholas Mark Henry and Dance, Rachel and Alkhimova, M. A. and Booth, N. and Green, J. and Gregory, C and McKenna, P, and Woolsey, N and Kodama, R. (2017) X-ray spectroscopy of super-intense laser-produced plasmas for the study of nonlinear processes. Comparison with PIC simulations. Journal of Physics: Conference Series, 810 (1). ISSN 1742-6588

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    Abstract

    We present X-ray spectroscopic diagnostics in femto-second laser-driven experiments revealing nonlinear phenomena caused by the strong coupling of the laser radiation with the created plasma. Among those nonlinear phenomena, we found the signatures of the Two Plasmon Decay (TPD) instability in a laser-driven CO2 cluster-based plasma by analyzing the Langmuir dips in the profile of the O VIII Lyϵ line, caused by the Langmuir waves created at the high laser intensity 3 1018Wcm-2. With similar laser intensities, we reveal also the nonlinear phenomenon of the Second Harmonic Generation (SHG) of the laser frequency by analyzing the nonlinear phenomenon of satellites of Lyman δ and ϵ lines of Ar XVII. In the case of relativistic laser-plasma interaction we discovered the Parametric Decay Instability (PDI)-induced ion acoustic turbulence produced simultaneously with Langmuir waves via irradiation of thin Si foils by laser intensities of 1021Wcm-2.