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On the reliability of scrape-off layer ion temperature measurements by retarding field analyzers
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SYSNO ASEP 0349320 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název On the reliability of scrape-off layer ion temperature measurements by retarding field analyzers Tvůrce(i) Kočan, M. (FR)
Gunn, J. P. (FR)
Komm, Michael (UFP-V) RID, ORCID
Pascal, J.-Y. (FR)
Gauthier, E. (FR)
Bonhomme, G. (FR)Zdroj.dok. Review of Scientific Instruments. - : AIP Publishing - ISSN 0034-6748
Roč. 79, č. 7 (2008), 073502-073502Poč.str. 10 s. Forma vydání web - web Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova Plasma ; tokamak ; SOL ; ion temperature ; PIC ; RFA Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech CEP KJB100430602 GA AV ČR - Akademie věd CEZ AV0Z20430508 - UFP-V (2005-2011) UT WOS 000258179400016 DOI 10.1063/1.2955465 Anotace The retarding field analyzer (RFA) is one of the only widely accepted diagnostics for measurements of ion temperature Ti in the tokamak scrape-off layer. In this paper we analyze some instrumental effects of the RFA and their influence on Ti measurements. It is shown that selective ion transmission through the RFA slit is responsible for an overestimation of Ti by less than 14%, even for a relatively thick slit plate. Therefore, thicker slit plates are preferable, since they reduce, e.g., the risk of melting during off-normal events, and the effect of positive space charge inside the cavity. The influence of the electron repelling grid, as well as misalignment of the slit with respect to the magnetic field on Ti measurements are negligible. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2011
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