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Accélération de protons par laser à ultra-haute intensité : étude et application au chauffage isochore

Abstract : The interaction of ultra-high intensity, ultra-short laser pulses with matter is an interesting source of energetic ions. During this work, we studied the production of energetic protons and their application to isochoric heating using kinetics and hydrodynamics code. We first considered the behavior of the maximum proton kinetic energy with the Target Normal Sheath Acceleration (TNSA) mechanism, in the sub-ps interaction regime, as a function of different parameters, especially the laser pulse duration. We showed that stretching the pulse duration, with a constant laser energy, led to the preheating and the expansion of the plasma slab. This expansion can be beneficial or detrimental regarding the maximum proton kinetic energy. The results we obtained helped to explain an experimental study carried out at the Laboratoire d'Optique Appliquée. We then developed a semi-analytical model trying to describe the maximum proton kinetic energy that can be produced in the TNSA regime. The results we obtained can retrieve the minimum intensity, of the order of 6x1021 W/cm², that is required to reach proton energies of 150 MeV with femtosecond, few joules laser pulses.As a final step, we were interested in the use of these proton beams for isochoric heating. We first characterized the proton distribution function produced by targets consisting in an heavy substrate with an hydrogen is deposited at the rear side. By the mean of hydrodynamics simulations, we studied the characteristic expansion time of the heated target by varying several parameters such as the heated sample distance from the proton source, the intensity and focal spot size of the laser, and the areal density of the dot. Finally, we extended the previous study to cylindrical targets and we demonstrated that it is possible to counterbalance the natural divergence of the proton beam and hence, to reach higher temperatures.
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Submitted on : Tuesday, July 12, 2011 - 9:43:21 AM
Last modification on : Thursday, April 11, 2019 - 7:23:13 AM
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  • HAL Id : tel-00608050, version 1

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Michaël Carrié. Accélération de protons par laser à ultra-haute intensité : étude et application au chauffage isochore. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2011. Français. ⟨NNT : 2011PA112007⟩. ⟨tel-00608050⟩

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