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236 results on '"Rosmej, F. B."'

1. Time dependence of quantum oscillator excitation by electromagnetic pulses

Author

Astapenko, V. A., Rosmej, F. B., and Sakhno, E. V.

Subjects
Physics - Atomic Physics
Abstract

The paper is devoted to the theoretical investigation of time dependences of quantum oscillator excitation by electromagnetic pulses for arbitrary values of field amplitude in the pulse. We consider the harmonic oscillator without relaxation and excitation between stationary states. The general formula for excitation of quantum states as function of time is derived in terms of instant energy of associated classical oscillator in the field of electromagnetic pulse. Thus, it is established that time dependence of quantum oscillator excitation is completely determined by the energy of the associated classical oscillator at given moment of time. Using derived expression time dependence of quantum oscillator excitation is investigated in details including total excitation from ground state, excitation from excited states, total excitation probability and corresponding excitation spectra., Comment: 21 pages, 8 figures

Published
2020

3. Atomic population kinetics in the context of XUV/X-ray free electron laser generating warm dense matter and strongly coupled plasmas

Author

Aouad, Y. J., Rosmej, F. B., Demura, A. V., and Lisitsa, V. S.

Subjects
Physics - Plasma Physics
Abstract

In the present paper we propose the use of desnity matrix formalism for the calculation of the atomic spectroscopic properties of autoionizing states in dense plasmas, i.e. warm dense matter and strongly coupled plasmas. This is motivated by the importance of taking into account the effect of the electric microfield generated by the plasma charge constituents in the calculation of the atomic populations of autoionizing states. For autoionizing states, electron densities justifying the statistical approach exceed solid density bringing serious doubts to the statistical approach even in dense plasmas. This leads also to the change of the spectral line shapes in the frame of the standard methods. We discuss the importance of the present analysis in view of the radiation emission originating from dense plasmas created by the interaction of the X-ray Free Electron Lasers (XFEL) with solid density matter.

Published
2017

7. Emission Spectroscopy from an XUV Laser Irradiated Solid Target

Author

Dzelzainis, T. W. J., Khattak, F. Y., Nagler, B., Vinko, S., Whitcher, T., Nelson, A. J., Lee, R. W., Bajt, S, Toleikis, S., Fäustlin, R., Tschentscher, T., Juha, L., Kozlova, M., Chalupsky, J, Hajkova, V., Krzywinski, J., Soberierski, R., Jurek, M., Fajardo, M., Rosmej, F. B., Heinmann, P., Wark, J. S., Riley, D., Lewis, Ciaran L. S., editor, and Riley, Dave, editor

Published
2009
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15. The generation of fast particles in plasmas created by laser pulses with different wavelengths

Author

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

Published
2002
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25. X-ray observations of ${{\rm{K}}}_{\beta }$ emission from mediumZHe-like ions in C-Mod tokamak plasmas

Author

Rice, J E, primary, Rosmej, F B, additional, Cao, N, additional, Chilenski, M, additional, Howard, N T, additional, Hubbard, A E, additional, Hughes, J W, additional, Irby, J H, additional, Lin, Y, additional, Rodriguez-Fernandez, P, additional, Wolfe, S M, additional, Wukitch, S J, additional, Bitter, M, additional, Delgado-Aparicio, L, additional, Hill, K, additional, and Reinke, M L, additional

Published
2018
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27. Laser-guided, intersecting discharge channels for the final beam transport in heavy-ion fusion.

Author

Niemann, C., Neff, S., Tauschwitz, A., Penache, D., Birkner, R., Constantin, C., Knobloch, R., Presura, R., Rosmej, F. B., Hoffmann, D. H. H., and Yu, S. S.

Subjects
ION bombardment, FUSION reactors
Abstract

Ion-beam transport in space charge neutralizing discharge channels has been proposed for the final focus and chamber transport in a heavy-ion fusion reactor. A driver scenario with two-sided target illumination requires a system of two intersecting discharges to transport beams of the same charge from opposite sides towards the fusion target. In this article we report on experiments on the creation of free-standing, intersecting high-current discharge channels. The discharges are initiated in ammonia gas (NH[SUB3]) in a metallic chamber by two perpendicular CO[SUB2]-laser beams, which resonantly heat and subsequently rarefy the gas along the laser paths before the breakdown. These low density channels guide the discharges along the predefined paths and also around the 90° angles without any mechanical guiding structures. In this way stable X-, T-, and L-shaped discharges with currents in excess of 40 kA, at pressures of a few mbar were created with a total length of 110 cm. An 11.4 A MeV [SUP58]Ni[SUP+12] beam from the UNILAC (Universal Linear Accelerator) linear accelerator was used to probe the line-integrated ion-optical properties of the central channel in a T-shaped discharge. [ABSTRACT FROM AUTHOR]

Published
2003
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31. X-ray diagnostics of plasma focus DPF-78 discharge with heavy-gas admixtures.

Author

Antsiferov, P. S., Rosmej, F. B., Rosmej, O. N., Schmidt, H., Schulz, D., and Schulz, A.

Subjects
*X-rays, *HEAVY ions
Abstract

Presents a study which examined x-ray structure of the DPF-78 discharge with different heavy-gas admixtures. Details on the experimental facilities; Spatial structure of the x-ray emitting pinch; Discussion of findings.

Published
1995
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35. X-Ray Emission of Exotic Ions in Dense Plasmas.

Author

Rosmej, F. B., Khaghani, D., Dozières, M., Dachicourt, R., Šmíd, M., and Renner, O.

Subjects
*X-ray emission spectroscopy, *EXOTIC nuclei, *DENSE plasmas, *LASER plasmas, *METALLIC surfaces, *HEAVY ions
Abstract

Hollow ion X-ray emission has been observed in experiments studying interaction of heavy ion beams with solids and their occurrence has been ascribed to charge exchange processes occurring when highly charged ions interact with a metal surface. In high temperature high-density plasmas, like, e.g., high intensity laser produced plasmas or high current Z-pinches, numerous researchers have reported about "exotic" X-ray transitions of hollow ions: K0LX →K¹LX-1+hνhollow. Although atomic structure calculations seem to confirm that measured line positions correspond to transitions in hollow ions, line identification is difficult and the observed high intensity remains a mystery (by orders of magnitude) up to present days. [ABSTRACT FROM AUTHOR]

Published
2017
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41. Evidence for a glassy state in strongly driven carbon

Author

Brown, C. R. D., primary, Gericke, D. O., additional, Cammarata, M., additional, Cho, B. I., additional, Döppner, T., additional, Engelhorn, K., additional, Förster, E., additional, Fortmann, C., additional, Fritz, D., additional, Galtier, E., additional, Glenzer, S. H., additional, Harmand, M., additional, Heimann, P., additional, Kugland, N. L., additional, Lamb, D. Q., additional, Lee, H. J., additional, Lee, R. W., additional, Lemke, H., additional, Makita, M., additional, Moinard, A., additional, Murphy, C. D., additional, Nagler, B., additional, Neumayer, P., additional, Plagemann, K.-U., additional, Redmer, R., additional, Riley, D., additional, Rosmej, F. B., additional, Sperling, P., additional, Toleikis, S., additional, Vinko, S. M., additional, Vorberger, J., additional, White, S., additional, White, T. G., additional, Wünsch, K., additional, Zastrau, U., additional, Zhu, D., additional, Tschentscher, T., additional, and Gregori, G., additional

Published
2014
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47. Spaced resolved analysis of suprathermal electrons in dense plasma.

Author

Moinard, A., Petitdemange, F., Larour, J., and Rosmej, F. B.

Subjects
HOT carriers, LASER research, ENERGY dissipation, DENSE plasmas, CRYSTALS
Abstract

The investigation of the hot electron fraction is a crucial topic for high energy density laser driven plasmas: first, energy losses and radiative properties depend strongly on the hot electron fraction and, second, in ICF hohlraums suprathermal electrons preheat the D-T-capsule and seriously reduce the fusion performance. In the present work we present our first experimental and theoretical studies to analyze single shot space resolved hot electron fractions inside dense plasmas via optically thin X-ray line transitions from autoionizing states. The benchmark experiment has been carried out at an X-pinch in order to create a dense, localized plasma with a well defined symmetry axis of hot electron propagation. Simultaneous high spatial and spectral resolution in the X-ray spectral range has been obtained with a spherically bent quartz Bragg crystal. The high performance of the X-ray diagnostics allowed to identify space resolved hot electron fractions via the X-ray spectral distribution of multiple excited states. [ABSTRACT FROM AUTHOR]

Published
2013
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50. Warm dense aluminum plasma generated by the free-electron-laser FLASH

Author

Zastrau, U., primary, Vinko, S. M., additional, Wark, J. S., additional, Toleikis, S., additional, Tschentscher, T., additional, Glenzer, S. H., additional, Lee, R. W., additional, Nelson, A. J., additional, Dzelzainis, T. W. J., additional, Riley, D., additional, Nagler, B., additional, Galtier, E., additional, Rosmej, F. B., additional, and Förster, E., additional

Published
2012
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