Estimation of the Lyman-α signal of the EFILE diagnostic under static or radiofrequency electric field in vacuum
| Autor: | Laurence Chérigier-Kovacic, F. Doveil, Carlo Poggi, Théo Guillaume |
|---|---|
| Přispěvatelé: | Ricerca Formazione Innovazione (Consorzio RFX), Consiglio Nazionale delle Ricerche (CNR), Aix Marseille Université (AMU), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Stark effect Electric field measurement Condensed Matter Physics 01 natural sciences 7. Clean energy Signal 010305 fluids & plasmas Computational physics [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] Electric field 0103 physical sciences Electromagnetic simulations Diagnostics |
| Zdroj: | Plasma Science and Technology Plasma Science and Technology, IOP Publishing, 2018, 20 (7) Plasma Science and Technology, 2018, 20 (7) |
| ISSN: | 1009-0630 0741-3335 1757-899X 0034-4885 |
| Popis: | International audience; The EFILE diagnostic (Electric Field Induced Lyman-α Emission) aims to provide a non intrusive and precise measurement of the electric field in plasma, using a beam of hydrogen atoms prepared in the metastable 2s state. The metastable particles are obtained by means of a proton beam extracted from a hydrogen plasma source, and neutralised by interaction with vaporised caesium. When a 2s atom enters a region where an electric field is present, it undergoes a transition to the 2p state (Stark mixing). It then quickly decays to the ground level, emitting Lyman-α radiation, which is collected by a photomultiplier. The 2s → 2p transition rate is proportional to the square of the magnitude of the electric field, and depends on the field oscillation frequency (with peaks around 1 GHz). By measuring the intensity of the Lyman-α radiation emitted by the beam it is possible to determine the magnitude of the field in a defined region. In this work, an analysis of the behaviour of the diagnostic under static or radiofrequency electric field is presented. Electric field simulations obtained with a finite element solver of Maxwell equations, combined with theoretical calculations of the Stark mixing transition rate, are used to develop a model for the interpretation of photomultiplier data. This method shows good agreement with experimental results for the static field case, and allows to measure the field magnitude for the oscillating case. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|