Laser energy deposition in relativistic interactions with underdense plasmas |
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Authors: | P Chessa M Galimberti A Giulietti D Giulietti L A Gizzi P Mora |
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Institution: | (1) Istituto di Fisica Atomica e Molecolare, Via del Giardino 7, 56127 Pisa, Italy;(2) Dipartimento di Fisica, Università di Pisa, and INFM, Pisa, Italy;(3) Centre de Physique Théorique, école Polytechnique, 91128 Palaiseau Cedex, France |
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Abstract: | It is well established that, at sub-relativistic intensities, the absorption of laser light by underdense plasmas decreases
with increasing pulse intensity as interaction enters a non-linear regime. On the other hand, as the relativistic interaction
regime is reached, further absorption mechanisms can be activated which can account for a substantial energy transfer. Using
the particle code WAKE, we performed numerical simulations of the relativistic interaction of intense laser pulses with underdense
plasmas in conditions that can be experimentally tested. Our simulations show that, while the relativistic laser intensity
generates a population of fast electrons, a considerable fraction of the pulse energy goes into a population of thermal electrons. These findings open new possibilities for a direct observation of relativistic interaction processes using high
resolution soft X-ray techniques. |
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Keywords: | PACS" target="_blank">PACS 52 50 Jm Plasma production and heating by laser beams 52 40 Nk Laser-plasma interactions e g anomalous absorption backscattering magnetic field generation fast particle generation 52 25 Rv Emission absorption and scattering of visible and infrared radiation |
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