Graphite oxide based targets applied in laser matter interaction

Mariapompea Cutroneo,Zdenek Sofer,Anna Mackova,Petr Malinsky,Jan Badziak,Jan Luxa,Lorenzo Torrisi,Marcin Rosinski,Antonino Cannavò,Jan Lorincik,Vladimir Havranek,L Torrisi,M Cutroneo

doi:10.1051/epjconf/201816702004

Abstract

In the present work, we propose the production of a hybrid graphene based material suitable to be laser irradiated with the aim to produce quasi-monoenergetic proton beams using a femtosecond laser system. The unique lattice structure of the irradiated solid thin target can affect the inside electron propagation, their outgoing from the rear side of a thin foil, and subsequently the plasma ion acceleration. The produced targets, have been characterized in composition, roughness and structure and for completeness irradiated. The yield and energy of the ions emitted from the laser-generated plasma have been monitored and the emission of proton stream profile exhibited an acceleration of the order of several MeVs/charge state.

Highlights

Graphene exhibits unique electronic band structure, thermal conductivity and excellent electronic transport properties electrons in graphene often are indicated as “ massless”[1]
We followed up the increasing demand of advanced target engineering in laser matter interaction, proposing a hybrid graphene based material fabricated to be irradiated by sub-picosecond high intensity laser, taking into account the significance of target composition, geometry, resistivity, roughness and thickness for the electron propagation and the production of sharp proton bunches; we paid attention to the close dependence between the electron spatial distribution and the features of emitted ions plasma laser-generated
In the case of high current of electrons propagating in a solid target, as a consequence of high energy sub-picosecond laser pulse, due to charge neutrality, an “inverse” current of thermal electrons will induce the heating of a wide volume of the target generating a non equilibrium state of warm dense matter consisting of hot electrons and cold ions which are temporarily in the same position where they were in the condensed matter state

Summary

Introduction

Graphene exhibits unique electronic band structure, thermal conductivity and excellent electronic transport properties electrons in graphene often are indicated as “ massless”[1]. In the case of high current of electrons propagating in a solid target, as a consequence of high energy sub-picosecond laser pulse, due to charge neutrality, an “inverse” current of thermal electrons will induce the heating of a wide volume of the target generating a non equilibrium state of warm dense matter consisting of hot electrons and cold ions which are temporarily in the same position where they were in the condensed matter state. In this situation the target conductivity depends on its ability to maintain its lattice structure. The structural, compositional and optical properties of the samples have been performed at Tandetron laboratory of the Nuclear Physics Institute, CAS, in Rez (Czech Republic)

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