New paper published on Nuclear and Instruments and Methods in Physics Research A

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

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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Research article on Laser-Plasma Interaction relevant for Shock Ignition scheme promoted by Physics of Plasmas as an Editor’s Pick.

Shock Ignition is a promising approach to reach ignition by means of intense laser pulses driving a strong shock on a pre-compressed fuel pellet. This scheme, proposed in 2007 by R.Betti (Rochester University, USA), has the advantage of strongly reducing the hydrodynamic instabilities. Moreover, a full-scale demonstration can be realized with present day technology and facilities (e.g. National Ignition Facility in Livermore, Laser MegaJoule in Bordeaux). In the framework of a recently approved collaborative European project, funded by EUROFUSION (European Consortium for the Development of Fusion Energy), we recently carried out several experimental campaigns at the Prague Asterix Laser System (Prague, Czech Republic) to investigate laser-plasma interaction in conditions relevant for Shock Ignition, i.e. laser intensities of 10^16 W/cm2 impinging on long (mm) and hot (several keV) plasmas .
The paper “Measurements of parametric instabilities at laser intensities relevant to strong shock generation” analyses in detail the onset and the growth of parametric instabilities (Stimulated Raman Scattering, Stimulated Brillouin Scattering, Two Plasmon Decay) in such conditions . It has been recently published in Physics of Plasmas and promoted as an Editor’s Pick.

2 post-doc fellowships available at ILIL

On going research activities include electron and proton acceleration, X and gamma-ray generation, as well as applications of the produced high energy radiation. In this context, ILIL is looking for 2 young (< 36 years old) scientists for 2-year post-doc fellowships each (net salary approx 1600 euro/month), to be hired in the framework of the project ARCO-CNR “LASERPIXE”, recently funded by Regione Toscana (participating partners: National Institute of Optics – CNR, Institute of Clinical Physiology – CNR, INFN – Sezione di Firenze, VCS Parma). The activity will concern the application of laser driven (all-optical) high-energy charged particles and secondary X/gamma radiation in medicine and non-destructive elemental analysis (for instance X-ray tomography and Particle Induce X-ray Emission – PIXE). A PhD or 3 years post-graduate experience in Physics, Chemistry, Mathematics or Engineering is required, along with a good knowledge of spoken and written English.

Here you can find the call

 

Deadline: 15 january 2018

For further information please contact:
Fernando Brandi, fernando.brandi@ino.cnr.it, tel. +39 050 315 2584
Luca Labate, luca.labate@ino.cnr.it, tel. +39 050 315 2255
Leonida A. Gizzi, la.gizzi@ino.cnr.ir, tel. +39 050 315 2257

Paper on Scientific Reports is now online…

Laser-matter interaction with ultrashort-pulses at high intensity strongly depends upon energy absorption by the surface of the material. Energy is mostly converted in kinetic energy of electrons while much heavier ions remain still during the laser pulse. What happens when we use a NANO-SCALE COMB-LIKE SURFACE instead of a flat surface? What is the role of the comb wires? We know that in this ultra-intense, ultra-short pulse regime, electrons are ripped off from the surface and start oscillating abruptly. In general, however, experimental results on energy absorption are contradictory and strongly affected by experimental conditions. A recent study promoted by CNR in collaboration with TIFR (Mumbai), with the participation of INFN and INAF, sheds light on this complex process, comparing combs with different wire spacing. Experimental results show that if the extent of the oscillation is large compared to the wire spacing, electrons hit the wires frequently losing energy, and their motion becomes stochastic. In contrast, if the excursion of the oscillation is small compared to the wire spacing, the motion of electrons is coherent with the laser light and more electrons acquire more energy. These experimental results, well described by the numerical model developed for this study, opens new possibilities for the control of laser absorption, with potential applications to light ion acceleration with lasers, where control of energy absorption plays a crucial role.