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Absorption of ultrashort electromagnetic pulses in plasma with inhomogeneous distribution of density and temperature |
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| Authors: | Valeriy A Astapenko Sergey V Sakhno Valery S Lisitsa |
| Institution: | 1. Moscow Institute of Physics and Technology “MIPT”, Dolgoprudnyi, Russia;2. Moscow Institute of Physics and Technology “MIPT”, Dolgoprudnyi, Russia
Plasma Physics Department, National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute), Institute of Laser and Plasma Technologies, Moscow, Russia National Research Center “Kurchatov Institute”, Moscow, Russia |
| Abstract: | The analysis of influence of the inhomogeneous distribution of temperature and density of atoms on the probability of absorption of ultrashort electromagnetic pulses in plasma is carried out. A specific example of divertor plasma of tokamaks and absorption in the Lyman series (at the Ly-α line) is considered. It is shown that the absorption probability may exceed relative populations of excited levels in divertor plasma by several orders of magnitude. The influence of the pulse duration on the probability of excitation of an atomic level is considered. The results suggest a possibility of a sharp increase in a fluorescence signal under the action of an ultrashort pulse. |
| Keywords: | absorption dense plasma ultrashort electromagnetic pulse |