X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma

Baffigi, F.; Cristoforetti, G.; Fulgentini, Lorenzo; Giulietti, A.; Koester, P.; Labate, L.; Gizzi, L. A.

doi:10.1063/1.4886977

Cited by 13 publications

(11 citation statements)

References 30 publications

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“…A schematic view of the pilot experimental setup is given in Figure 4. Special attention was dedicated in the experimental campaign to the target integrity prior to the arrival of the main pulse on the target, which strongly depends on the temporal profile of the laser pulse [22]. To this purpose, we used optical spectroscopy of the light scattered in the specular direction to monitor the generation of second harmonic emission, 2ω L , and (3/2)ω L of the incident laser light.…”

Section: Results: Pilot Experimental Activitymentioning

confidence: 99%

A New Line for Laser-Driven Light Ions Acceleration and Related TNSA Studies

et al. 2017

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Abstract:In this paper, we present the status of the line for laser-driven light ions acceleration (L3IA) currently under implementation at the Intense Laser Irradiation Laboratory (ILIL), and we provide an overview of the pilot experimental activity on laser-driven ion acceleration carried out in support of the design of the line. A description of the main components is given, including the laser, the beam transport line, the interaction chamber, and the diagnostics. A review of the main results obtained so far during the pilot experimental activity is also reported, including details of the laser-plasma interaction and ion beam characterization. A brief description of the preliminary results of a dedicated numerical modeling is also provided.

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Section: Results: Pilot Experimental Activitymentioning

confidence: 99%

A New Line for Laser-Driven Light Ions Acceleration and Related TNSA Studies

et al. 2017

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“…The only possibility is that such peaks were produced by Thomson scattering of integer-harmonic light ( , , ), strongly visible in the acquired spectra, with the EPWs driven by backward- and side SRS. The generation of and higher harmonics is usually associated to the nonlinear interaction of laser light with plasma waves excited near the critical density, and depends critically on plasma steepness, laser intensity and laser polarization [43, 44] ; the presence of such peaks is therefore indirect evidence that a fraction of laser light reaches the critical density surface. The coupling combinations are reported in Figure 5, where the peaks on the blue side of the nominal half-harmonic frequencies are produced by Thomson down-scattering, while the peaks on the red side are due to Thomson up-scattering processes.…”

Section: Half-integer Harmonic Spectramentioning

confidence: 99%

Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma

Cristoforetti¹,

Antonelli

Mancelli

et al. 2019

High Pow Laser Sci Eng

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Laser–plasma interaction (LPI) at intensities $10^{15}{-}10^{16}~\text{W}\cdot \text{cm}^{-2}$ is dominated by parametric instabilities which can be responsible for a significant amount of non-collisional absorption and generate large fluxes of high-energy nonthermal electrons. Such a regime is of paramount importance for inertial confinement fusion (ICF) and in particular for the shock ignition scheme. In this paper we report on an experiment carried out at the Prague Asterix Laser System (PALS) facility to investigate the extent and time history of stimulated Raman scattering (SRS) and two-plasmon decay (TPD) instabilities, driven by the interaction of an infrared laser pulse at an intensity ${\sim}1.2\times 10^{16}~\text{W}\cdot \text{cm}^{-2}$ with a ${\sim}100~\unicode[STIX]{x03BC}\text{m}$ scalelength plasma produced from irradiation of a flat plastic target. The laser pulse duration (300 ps) and the high value of plasma temperature ( ${\sim}4~\text{keV}$ ) expected from hydrodynamic simulations make these results interesting for a deeper understanding of LPI in shock ignition conditions. Experimental results show that absolute TPD/SRS, driven at a quarter of the critical density, and convective SRS, driven at lower plasma densities, are well separated in time, with absolute instabilities driven at early times of interaction and convective backward SRS emerging at the laser peak and persisting all over the tail of the pulse. Side-scattering SRS, driven at low plasma densities, is also clearly observed. Experimental results are compared to fully kinetic large-scale, two-dimensional simulations. Particle-in-cell results, beyond reproducing the framework delineated by the experimental measurements, reveal the importance of filamentation instability in ruling the onset of SRS and stimulated Brillouin scattering instabilities and confirm the crucial role of collisionless absorption in the LPI energy balance.

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“…Special attention was dedicated, during the experiment, to establish target integrity at the time of ar- rival of the main pulse on target which strongly depends on the temporal profile of the laser pulse [14]. A cross-correlation curve of the laser pulse taken with the Sequoia (Amplitude Technologies) is shown in Fig.(3).…”

Section: Experimental Set Upmentioning

confidence: 99%

Light Ion Accelerating Line (L3IA): Test experiment at ILIL-PW

Gizzi

Baffigi

Brandi

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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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 following 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.

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X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma

Cited by 13 publications

References 30 publications

A New Line for Laser-Driven Light Ions Acceleration and Related TNSA Studies

A New Line for Laser-Driven Light Ions Acceleration and Related TNSA Studies

Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma

Light Ion Accelerating Line (L3IA): Test experiment at ILIL-PW

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