Počet záznamů: 1
Direct determination of midplane background neutral density profiles from neutral particle analyzers
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SYSNO ASEP 0555297 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Direct determination of midplane background neutral density profiles from neutral particle analyzers Tvůrce(i) Bogár, Klára (UFP-V) ORCID
Geiger, B. (US)
Schneider, P.A. (DE)
Van Vuuren, A. J. (DE)
Grover, Ondřej (UFP-V) ORCIDCelkový počet autorů 5 Číslo článku 036001 Zdroj.dok. Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515
Roč. 61, č. 3 (2021)Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. AT - Rakousko Klíč. slova background neutral density ; elm ; fidasim ; neutral particle analyzer ; plasma ionization source Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) CEP EF16_019/0000768 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Omezený přístup Institucionální podpora UFP-V - RVO:61389021 UT WOS 000612012500001 EID SCOPUS 85101453854 DOI 10.1088/1741-4326/abcd75 Anotace Here we present a new method that allows the determination of background neutral density profiles based on measurements from neutral particle analyzers (NPA). Bayesian optimization is used to obtain a reliable 5-parameter representation of the inferred profiles. The method has been benchmarked using forward modelling from FIDASIM against measured data. The systematic errors coming from assumptions made in the analysis were evaluated and they are lower than 5%. The new method has been tested using data from the ASDEX Upgrade tokamak. When using reconstructed neutral density profiles, good agreement is found between the measured NPA fluxes of neutralized fast ions with predictions based on TRANSP and FIDASIM. Moreover, a clear drop of neutral density is observed at the plasma boundary after edge localized mode (ELM) activity. As suggested by KN1D simulations, this drop is mainly due to an increase of scrape-off layer (SOL) ionization rate, resulting from higher SOL plasma densities and temperatures after the ELM crash. Moreover, the new method allows calculating the local plasma ionization source which will be important for future transport studies. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2022 Elektronická adresa https://iopscience.iop.org/article/10.1088/1741-4326/abcd75
Počet záznamů: 1