X-Ray and VUV Spectra from the Laser Plasma Produced with “Kanal-2” Facility

Andrey Aleksandrovich Kologrivov, Mikhail Vladimirovich Osipov, Victor Nikolaevich Puzyrev, Alexandr Nikolaevich Starodub, Oleg Feliksovich Yakushev

P. N. Lebedev Physical Institute of RAS, Moscow, Russia.

DOI: 10.4236/jmp.2014.52015                

Abstract

The paper presents experimental results obtained on “Kanal-2” facility. Laser radiation focusing on the surface of plane magnesium targets created the high temperature plasma, which emitted X-ray and vacuum ultraviolet (VUV) radiation. This radiation spectrum was investigated with two spectrographs: the mica crystal spectrograph (working range 8.2 ? - 9.6 ?) and the grazing incidence VUV spectrograph (working rage 30 ? - 130 ?). A set of beryllium stepwise attenuators appended the diagnostic complex and allowed us to get an approximated picture of a continuous spectrum within the range of 2.2 ? - 6.2 ?. The estimation of the plasma electron temperature T_e from the ratio between the intensity of the dielectronic satellites and the resonance line gives T_e ~ 180 eV. The ratio between the intensity of the resonance and intercombination lines gives the electron density of the emitting zone n_e ~ 2 × 10¹⁹ cm^-3. Some lines observed within the spectral range of 8.5 ? - 9.1 ? belong to none of the transitions of Mg ions. Perhaps the observed spectrum is determined by the transitions in so-called hollow ions of Mg, i.e. in the ions with unfilled inner shells. The spectra obtained with the grazing incidence spectrograph and with the minimum-directioned discrepancy iteration method of spectrum reconstruction from the attenuation curve in the beryllium stepwise attenuators are also presented.

Keywords

Laser Plasma; X-Ray Spectra; VUV Spectra; Plasma Diagnostics

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	D. T. Attwood, L. W. Coleman and M. J. Boyle, “Spatially and Temporally Resolved X-Ray Emission from Imploding Laser Fusion Targets,” Report UCRL-78434, 1976.
[2]	M. N. Key and R. J. Hutcheson, “Spectroscopy of Laser Produced Plasmas,” Advances in Atomic and Molecular Physics, Vol. 16, 1980.
[3]	N. G. Basov, Yu. A. Bykovskii, A. V. Vinogradov, A. A. Galichii, M. P. Kalashnikov, V. L. Kantsyrev, Yu. P. Kozyrev, M. Yu. Mazur, Yu. A. Mikhailov, V. P. Puzyrev, A. V. Rode, G. V. Sklizkov and I. Ya. Frondzei, Quantum Electronics, Vol. 12, 1982, p. 977. http://dx.doi.org/10.1070/QE1982v012n08ABEH005741
[4]	M. C. Richardson, “X-Rays from Laser plasmas,” Proceedings of SPIE, Vol. 831, 1988, pp. 150-153.
[5]	J. Abdallah, I. Yu. Skobelev, A. Ya. Faenov, A. I. Magunov, T. A. Pikuz, F. Flora, S. Bollanti, P. DiLazzaro, T. Letardi, E. Burattini, A. Grilli, A. Reale, L. Palladino, G. Tomassetti, A. Scafati and L. Reale, Quantum Electronics, Vol. 30, 2000, p. 694. http://dx.doi.org/10.1070/QE2000v030n08ABEH001793
[6]	S. I. Fedotov, L. P. Feoktistov, M. V. Osipov and A. N. Starodub, Journal of Russian Laser Research, Vol. 25, 2004, p. 79. http://dx.doi.org/10.1023/B:JORR.0000012486.89881.d8
[7]	V. A. Burakov, B. L. Vasin, A. A. Kologrivov, M. V. Osipov, V. N. Puzyrev, A. N. Starodub, A. A. Fronya, M. L. Chernodub and O. F. Yakushev, “X-Ray Diagnostic Complex at the ‘KANAL-2’ Experimental Setup,” P N Lebedev Physical Institute RAS, Preprint No 3, Moscow, 2012. (in Russian)
[8]	I. Yu. Skobelev, A. Ya. Faenov, B. A. Bryunetkin, V. M. Dyakin, T. A. Pikuz, S. A. Pikuz, T. A. Shelkovenko, V. M. Romanova and A. R. Mingaleev, Journal of Experimental and Theoretical Physics, Vol. 81, 1995, p. 692.
[9]	А. А. Коlogrivov, G. V. Sklizkov and A. S. Shikanov, “Reconstruction of a CW X-Ray Laser Plasma Spectrum from the Attenuation Curves,” P N Lebedev Physical Institute RAS, Preprint No 142, Moscow, 1981. (in Russian)
[10]	E. L. Kosarev, Computer Physics Communications, Vol. 20, 1980, p. 69. http://dx.doi.org/10.1016/0010-4655(80)90110-1
[11]	L. P. Presnyakov, Soviet Physics Uspekhi, Vol. 19, 1976, pp. 387-399. http://dx.doi.org/10.1070/PU1976v019n05ABEH005259
[12]	I. Yu. Skobelev, A. Ya. Faenov and T. A. Pikuz, “The Spectra of Multi-Charged Hollow Ions in the X-Ray Emission of Hyper-Dense Laser Plasma,” Proceedings of the VIIth Russian Conference on Up-to-Date Methods for Plasma Diagnostics and Their Application in Matter and Environment Control, Moscow, 2010, p. 131. (in Russian)
[13]	R. L. Kelly, “Atomic and Ionic Spectrum Lines below 2000 Angstroms,” Report No ORNL-5922, 1982.
[14]	А. А. Коlogrivov, A. M. Maksimchuk, Yu. A. Mikhailov, A. V. Rode, A. A. Rupasov, G. V. Sklizkov, S. I. Fedotov, V. V. Frolov and A. S. Shikanov, Plasma Physics, Vol. 13, 1987, p. 826. (in Russian)
[15]	O. B. Anan’in, Yu. V. Afanasiev, Yu. A. Bykovsky and O. N. Krokhin, “Laser Plasma. Physics and Applications,” Мoscow, 2003. (in Russian)
[16]	M. A. Blokhin and I. G. Shveitser, “X-Ray Handbook,” Мoscow, 1982. (in Russian)
[17]	H. R. Griem, “Plasma Spectroscopy,” New York, 1964.
[18]	R. W. P. McWhirter, “Spectral Intensities,” In: R. H. Huddlestone and S. L. Leonard, Eds., Plasma Diagnostic Techniques, Academic Press, New York, 1965.