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Diagnostic de Plasmas créés dans des Sources d'Ions Multichargés à Résonance Cyclotronique Electronique par Spectroscopie VUV

Abstract : To characterize the multicharged ions within the plasma of an ECR ion source, the VUV spectroscopy is used as a non invasive diagnostic of excited matter. In ECRIS electrons are heated and magnetically confined within the mirror machine to overcome the successive ionization potentials of the desired elements. As the electrons bounce inside the magnetic configuration in their gyration movement, they interact with the microwaves injected into the source at the resonance frequency. To enhance the performances in high charge states and extracted currents delivered by ECRIS, the fundamental parameters of the plasma created in these machines must be known. The goal of spectroscopic diagnostics in the VUV range installed on the sources is to determine electron density and temperature on one hand, the ionic densities and confinement times on the other hand. We use micro channel plates as detector on a 3 meter grazing incidence spectrometer equipped with a 600 lines/mm holographic grating. The calibration of the whole grating with detector was performed by 2 different methods. These are the branching ratios and charge exchange methods. Identification of lines emitted by a plasma, which gather the whole charge states of ions is necessary to make an exhaustive study of the plasma state. And finally, the determination of the plasma parameters like electronic density and temperature and ion densities and confinement times that uses theoretical models was the aim of this work.
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https://tel.archives-ouvertes.fr/tel-00110296
Contributor : Roger Berreby <>
Submitted on : Friday, October 27, 2006 - 12:02:04 PM
Last modification on : Wednesday, December 9, 2020 - 3:12:04 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 9:10:30 PM

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  • HAL Id : tel-00110296, version 1

Citation

Roger Berreby. Diagnostic de Plasmas créés dans des Sources d'Ions Multichargés à Résonance Cyclotronique Electronique par Spectroscopie VUV. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 1997. Français. ⟨tel-00110296⟩

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