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1

Diagnostics of laser-produced plasmas

Batani D., Morace A., Maheut Y., Jakubowska K., Volpe L.

Nukleonika

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2016

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Vol. 61, No. 4

393--401

EN

We present the general challenges of plasma diagnostics for laser-produced plasmas and give a few more detailed examples: spherically bent crystals for X-ray imaging, velocity interferometers (VISAR) for shock studies, and proton radiography.

2

Shock dynamics induced by double-spot laser irradiation of layered targets

Aliverdiev A. A., Batani D., Amirova A. A., Benocci R., Dezulian R., Krouský E., Pfeifer M., Skala J., Dudzak R., Jakubowska K.

Nukleonika

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2015

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Vol. 60, No. 2

213--219

EN

We studied the interaction of a double-spot laser beam with targets using the Prague Asterix Laser System (PALS) iodine laser working at 0.44 μm wavelength and intensity of about 1015 W/cm2. Shock breakout signals were recorder using time-resolved self-emission from target rear side of irradiated targets. We compared the behavior of pure Al targets and of targets with a foam layer on the laser side. Results have been simulated using hydrodynamic numerical codes.

3

Experimental results on advanced inertial fusion schemes obtained within the HiPER project

Batani D., Gizzi L. A., Koester P., Labate L., Honrubia J., Antonelli L., Morace A., Volpe L., Santos J. J., Schurtz G., Hulin S., Ribeyre X., Nicolai P., Vauzour B., Dorchies F., Nazarov W., Pasley J., Richetta M., Lancaster K., Spindloe Ch., Tolley M., Neely D., Kozlová M., Nejdl J., Rus B., Wołowski J., Badziak J.

Nukleonika

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2012

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Vol. 57, No. 1

3-10

EN

This paper presents the results of experiments conducted within the Work Package 10 (fusion experimental programme) of the HiPER project. The aim of these experiments was to study the physics relevant for advanced ignition schemes for inertial confinement fusion, i.e. the fast ignition and the shock ignition. Such schemes allow to achieve a higher fusion gain compared to the indirect drive approach adopted in the National Ignition Facility in United States, which is important for the future inertial fusion energy reactors and for realising the inertial fusion with smaller facilities.

4

Can laser - driven protons be used as diagnostics in ICF experiments ?

Volpe L., Batani D.

Nukleonika

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2012

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Vol. 57, No. 2

231-235

EN

Point projection proton backlighting was recently used to image a cylindrical imploding target at Rutherford Appleton Laboratory (UK). Due to the relatively low energy and to the very large mass densities reached during implosion, protons traveling through the target undergo a very large number of collisions which reduced the resolution. Here, we present a simple analytical model to study the proton radiography (PR) performance as a function of the main experimental parameters. This approach leads to define two different criteria for PR resolution describing different experimental conditions.

5

Studies on fast electron transport in the context of fast ignition

Batani D.

Nukleonika

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2011

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Vol. 56, No. 2

99-106

EN

This paper deals with the problem of fast electron propagation in plasmas, in the context of the fast ignition (FI) approach to inertial confinement fusion (ICF). In FI, a short-pulse high-intensity laser beam should generate a beam of relativistic electrons, which propagate into the compressed pellet, depositing energy and igniting the fuel. The study of electron propagation in dense matter is hence essential to the success of this scheme. The propagation of relativistic electrons in dense matter is determined by collisions of fast electrons with ions and electrons in the material, which can be described in terms of stopping power, but it also depends on self-generated magnetic and electric fields, which play a major, or even dominant role. In this paper we will show the importance of such collective effects by discussing several experimental examples.

6

Carbon equation of state at high pressure: the role of the radiative transport in the impedance mismatch diagnostics

Aliverdiev A. A., Batani D., Dezulian R., Vinci T.

Nukleonika

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2011

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Vol. 56, No. 2

165-169

EN

A series of numerical simulation was performed on the application of the impedance mismatch technique to the experimental study of the equation of state (EOS) of porous carbon. Our conclusion is that this technique is useful for such a study up to laser intensities of the order of 1014 W/cm2 (in second or third harmonic of the Nd-laser). However, the inclusion of the radiation transport is important for the correct description of the shock propagation and can affect the results.