Detailed characterization of the early x-ray emission of a plasma produced by point-like laser irradiation of solid Al targets

Abstract

A study of the dynamics of the x-ray emission from a point-like Al plasma produced by tight-focusing laser irradiation of a thick target is reported. Two-dimensional maps of the x-ray emission calculated at selected wavelengths show that, due to the rapid expansion cooling, x-ray emission mostly originates from a thin spatial layer. These properties enabled the results of the simulations to be compared with time-resolved x-ray spectra obtained under well-controlled experimental conditions. The outcome of this comparison is discussed in details, in view of the results reported in a recently published Letter [L. A. Gizzi, C. A. Cecchetti, M. Galimberti, A. Giulietti, D. Giulietti, L. Labate, S. Laville, and B. Tomassini, Phys. Plasmas 10, 4601 (2003)]. Moreover, the x-ray-reabsorption issues and the role of the Doppler decoupling mechanism in the presence of the strong velocity gradient typical of our experimental condition are discussed, also in view of a possible dedicated experiment. (c) 2005 American Institute of Physics

Angular distribution and conversion of multi-keV L-shell X-ray sources produced from nanosecond laser irradiated thick-foil targets

“…Generally, the quasi-steady state will be obtained when the longitudinal size of the coronal plasma is close to two times the size of the focus spot (Max, 1982;Labate et al, 2005). Generally, the quasi-steady state will be obtained when the longitudinal size of the coronal plasma is close to two times the size of the focus spot (Max, 1982;Labate et al, 2005).…”

A novel technique for single-shot energy-resolved 2D x-ray imaging of plasmas relevant for the inertial confinement fusion

“…When imaging capabilities are needed, as in the study of fast electron transport in high density matter, flat or, a) E-mail: luca.labate@ino.it; Also at Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, Italy b) Also at Dipartimento di Ingegneria Industriale, Università di Roma "Tor Vergata", Italy and Fyzikln stav AV R v.v.i., Praha, Czech Republic c) Also at Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, Italy more often, bent Bragg crystals coupled to X-ray films, image plates or CCD cameras are commonly employed. In the first case, either a slit 34 or a set of pinholes 35 are used in order to get a simultaneous spatial resolution. In the latter case, a number of different configurations are used, allowing either 1D or 2D imaging of the source to be obtained 36,37 with typical spectral resolution down to a few eV.…”

Soft x-ray generation by a tabletop Nd:YAG/glass laser system

“…Laser induced plasma is a good radiator and visible, UV and x-radiation can be emitted by such hot plasma due to line transitions, radiative recombinations and bremsstrahlung radiation [24][25][26][27][28][29]. Radiative properties represent a classical example of non-interfering probe.…”