Intense laser source for X-ray laser research and laser-plasma study

Intra-Stark spectroscopy (ISS) is the spectroscopy within the quasi-static Stark profile of a spectral line. The present paper reviews the X-ray ISS-based studies recently advanced for the diagnostics of the relativistic laser–plasma interactions. By improving experiments performed on the Vulcan Petawatt (PW) laser facility at the Rutherford Appleton Laboratory (RAL), the simultaneous production of the Langmuir waves and of the ion acoustic turbulence at the surface of the relativistic critical density gave the first probe by ISS of the parametric decay instability (PDI) predicted by PIC simulations. The reliable reproducibility of the experimental signatures of PDI—i.e., the Langmuir-wave-induced dips—allowed measurements of the fields of the Langmuir and ion acoustic waves. The parallel theoretical study based on a rigorous condition of the dynamic resonance depending on the relative values of the ion acoustic and the Langmuir fields could explain the disappearance of the Langmuir dips as the Langmuir wave field increases. The ISS used for the diagnostic of the PDI process in relativistic laser–plasma interactions has reinforced the reliability of the spectral line shape while allowing for all broadening mechanisms. The results can be used for a better understanding of intense laser–plasma interactions and for laboratory modelling of physical processes in astrophysical objects.

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Spatially and spectrally resolved X-ray measurements in intense laser-plasma interactions

2012 Abstracts IEEE International Conference on Plasma Science ◽

10.1109/plasma.2012.6383675 ◽

2012 ◽

Author(s):

H. W. Powell ◽

Xiaohui Yuan ◽

D. C. Carroll ◽

M. Coury ◽

R. J. Gray ◽

...

Keyword(s):

Laser Plasma ◽

Intense Laser ◽

Plasma Interactions ◽

X Ray ◽

Laser Plasma Interactions ◽

Spectrally Resolved

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Spectroscopy Methods and Applications of the Tor Vergata Laser-Plasma Facility Driven by GW-Level Laser System

International Journal of Spectroscopy ◽

10.1155/2011/792131 ◽

2011 ◽

Vol 2011 ◽

pp. 1-28 ◽

Cited By ~ 6

Author(s):

M. Francucci ◽

P. Gaudio ◽

S. Martellucci ◽

M. Richetta

Keyword(s):

Laser Plasma ◽

Laser System ◽

Line Emission ◽

Pulsed Laser ◽

Plasma Source ◽

Laser Source ◽

Solid Target ◽

Glass Laser ◽

X Ray ◽

Level Laser

A review focused on plasma induced on solid target by GW-level pulsed laser source is presented. A description of the Tor Vergata laser-plasma source (TVLPS), at the Tor Vergata University in Rome, is given. Such a facility uses a 1 GW, tabletop, multistage Nd:YAG/Glass laser system, delivering infrared (IR) pulses with nanosecond width and 1064 nm wavelength (TEM00 mode). Its applications are discussed providing: wide analysis of IR → soft X-ray conversion efficiency (1.3–1.55 keV); measures and modeling of line emission in soft X-ray spectra, such as those from zinc plasma near Ne-like Zn XXI and from barium plasma near Ni-like Ba XXIX. Particular attention is devoted to high-n dielectronic Rydberg satellites for finding a useful diagnostic tool for plasma conditions. Dependence of plasma spectra on laser parameters is shown. Finally, microradiography applications are presented for thin biological samples. Images permit to visualize specific structures and detect bioaccumulation sites due to contamination from pollutants.

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