The generation of fast particles in plasmas created by laser pulses with different wavelengths

F.B. Rosmej, D.H.H. Hoffmann, W. Süß, A.E. Stepanov, Yu.A. Satov, Yu.B. Smakovskii, V.K. Roerich, S.V. Khomenko, K.N. Makarov, A.N. Starostin, A.Ya. Faenov, I.Yu. Skobelev, A.I. Magunov, M. Geißel, P. Pirzadeh, W. Seelig, T.A. Pikuz, R. Bock, T. Letardi, F. FloraS. Bollanti, P. Di Lazzaro, A. Reale, A. Scafati, G. Tomassetti, T. Auguste, P. D'Oliveira, S. Hulin, P. Monot, B.Yu. Sharkov

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Abstract

By means of spatially resolved high-resolution X-ray spectroscopy, we have investigated the generation of fast ions at various laser installations with different flux densities and laser wavelengths. It is demonstrated that the fast ion generation in laser-produced plasma can be achieved for a very low level of the averaged laser intensity on the target. The time-pf-flight mass spectrometry ion diagnostics and X-ray spectrographs give very close results for the energy distribution of the thermal ion component. For higher energies, however, we found significant differences: the spatially resolved high-resolution spectrographs expose the presence of suprathermal ions, while the time-of-flight method does not. Suprathermal ion energies Eionplotted as a function of the qλ2parameter show a large scatter far above the experimental errors. The cause of these large scatters is attributed to a strong nonuniformity of the laser intensity distribution in the focal spot. The analysis by means of hydrodynamics and spectral simulations show that the X-ray emission spectrum is a complex convolution from different parts of the plasma with strongly different electron density and temperature. It is shown that the highly resolved Li-like satellite spectrum near Heαcontains significant distortions even for very low hot electron fractions. Non-Maxwellian spectroscopy allows determination of both the hot electron fraction and the bulk electron temperature. © 2002 MAIK "Nauka/Interperiodica".
Original languageEnglish
Pages (from-to)60 - 72
Number of pages13
JournalJournal of Experimental and Theoretical Physics
Volume94
Issue number1
DOIs
Publication statusPublished - Jan 2002
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Rosmej, F. B., Hoffmann, D. H. H., Süß, W., Stepanov, A. E., Satov, Y. A., Smakovskii, Y. B., ... Sharkov, B. Y. (2002). The generation of fast particles in plasmas created by laser pulses with different wavelengths. Journal of Experimental and Theoretical Physics, 94(1), 60 - 72. https://doi.org/10.1134/1.1448609