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Modélisations de phénomènes de polarisation par gaines RF ou-et faisceau de particules dans un plasma magnétisé

Abstract : This work investigates the problematic of hot spots induced by accelerated particle fluxes in tokamaks. It is shown that the polarization due to sheaths in the edge plasma in which an electron beam at a high level of energy is injected, can reach several hundreds volts and thus extend the deposition area. The notion of obstructed sheath is introduced and explains the acceleration of energy deposition by decreasing of the sheath potential. Then, a 2D fluid modeling of flux tubes in front of ICRF antennae allows us to calculate the rectified potentials taking into account RF polarization currents transverse to magnetic field lines. The 2D fluid code designed validates the analytical results which show that the DC rectified potential is 50% greater with polarization currents than without. Finally, the simultaneous application of an electron beam and a RF potential reveals that the potentials due to each phenomenon are additives when RF potential is much greater than beam polarization. The density depletion of polarized flux tubes in 2D PIC simulations is characterized but not yet explained.
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Theses
File URL :
http://docnum.univ-lorraine.fr/prive/SCD_T_2005_0146_FAUDOT.pdf
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https://hal.univ-lorraine.fr/tel-01746655
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Submitted on : Thursday, March 29, 2018 - 10:42:02 AM
Last modification on : Friday, November 13, 2020 - 8:36:07 AM

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  • HAL Id : tel-01746655, version 1

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Eric Faudot. Modélisations de phénomènes de polarisation par gaines RF ou-et faisceau de particules dans un plasma magnétisé. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2005. Français. ⟨NNT : 2005NAN10146⟩. ⟨tel-01746655⟩

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