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Abstract: Spectral modification of an intense laser pulse propagating in a helium gas target was studied using Thomson scattering diagnostic. The spectra recorded at 90° to the laser propagation and polarization direction show a significant modulation and modification of the incident laser pulse during its interaction and propagation through the helium gas target. Simulations suggest that such a modulation in the spectrum of the laser pulse could arise due to its interaction with the self excited plasma waves. [Copyright &y& Elsevier]

Abstract The construction of a novel Laser-driven Light Ions Acceleration Line (L3IA) is progressing rapidly towards the operation, following the recent upgrade of the ILIL-PW laser facility. The Line was designed on the basis of the pilot experimental activity carried out earlier at the same facility to define design parameters and to identify main components including target control and diagnostic equipment, also in combination with the numerical simulations for the optimization of laser and target parameters. A preliminary set of data was acquired following the successful commissioning of the laser system > 100 TW upgrade. Data include output from a range of different ion detectors and optical diagnostics installed for qualification of the laser–target interaction. An overview of the results is given along with a description of the relevant upgraded laser facility and features. [ABSTRACT FROM AUTHOR]