Measurement of sheath potential in RF-biased flux tubes using a retarding field analyzer in Tore Supra tokamak
| Autor: | M. Kubic, Stéphane Heuraux, E. Faudot, L. Colas, J. P. Gunn, J. Jacquot |
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| Přispěvatelé: | Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Nuclear and High Energy Physics
Spectrum analyzer Tokamak Field (physics) business.industry Chemistry Analytical chemistry Plasma Tore Supra 01 natural sciences 010305 fluids & plasmas law.invention Magnetic field Optics Nuclear Energy and Engineering law [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] Electric field 0103 physical sciences General Materials Science Antenna (radio) 010306 general physics business |
| Zdroj: | Journal of Nuclear Materials Journal of Nuclear Materials, 2013, 438 (S), pp.S509-S512. ⟨10.1016/j.jnucmat.2013.01.105⟩ Journal of Nuclear Materials, Elsevier, 2013, 438 (S), pp.S509-S512. ⟨10.1016/j.jnucmat.2013.01.105⟩ |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2013.01.105⟩ |
| Popis: | 20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices (PSI), Forschungszentrum Julich, Aachen, GERMANY, MAY 21-25, 2012; International audience; The influence of RF electric fields on retarding field analyzer (RFA) measurements of sheath potential, V-sh is investigated. One-dimensional particle-in-cell simulations show that the RFA is able to measure reliably the rectified dc sheath potential only for ion plasma frequencies omega(pi) similar to the rf wave frequency omega(rf), while for real SOL conditions (omega(pi) > omega(rf)), when the RFA is magnetically connected to an RF antenna, it is strongly underestimated. An alternative method to investigate RF sheaths effects is proposed that uses broadening of the ion distribution function as evidence of the rf electric fields in the sheath. RFA measurements in Tore Supra indicate that the average effects of rf potentials do indeed propagate from the antenna 12 m along magnetic field lines. |
| Databáze: | OpenAIRE |
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