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DOUBLE code simulations of emissivities of fast neutrals for different plasma observation view-lines of neutral particle analyzers on the COMPASS tokamak
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SYSNO ASEP 0508697 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title DOUBLE code simulations of emissivities of fast neutrals for different plasma observation view-lines of neutral particle analyzers on the COMPASS tokamak Author(s) Bogár, Klára (UFP-V) ORCID
Tomeš, Matěj (UFP-V)
Stöckel, Jan (UFP-V) RID
Varju, Jozef (UFP-V) ORCID
Stano, M. (SK)Number of authors 5 Article number 012009 Source Title Journal of Physics: Conference Series, 1046. - Bristol : IOP Publishing Ltd., 2018 - ISSN 1742-6588 Pages roč. 992, č. 1 (2018) Number of pages 5 s. Publication form Online - E Action 20th International Summer School on Vacuum, Electron and Ion Technologies Event date 25.09.2017 - 27.09.2017 VEvent location Sozopol Country BG - Bulgaria Event type WRD Language eng - English Country GB - United Kingdom Keywords DOUBLE ; COMPASS Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects 8D15001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2015045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFP-V - RVO:61389021 UT WOS 000445817300009 EID SCOPUS 85045761544 DOI 10.1088/1742-6596/992/1/012009 Annotation Neutral particle analyzers (NPA) measure line-integrated energy spectra of fast neutral atoms escaping the tokamak plasma, which are a product of charge-exchange (CX) collisions of plasma ions with background neutrals. They can observe variations in the ion temperature T i of non-thermal fast ions created by additional plasma heating. However, the plasma column which a fast atom has to pass through must be sufficiently short in comparison with the fast atom's mean-free-path. Tokamak COMPASS is currently equipped with one NPA installed at a tangential mid-plane port. This orientation is optimal for observing non-thermal fast ions. However, in this configuration the signal at energies useful for T i derivation is lost in noise due to the too long fast atoms' trajectories. Thus, a second NPA is planned to be connected for the purpose of measuring T i. We analyzed different possible view-lines (perpendicular mid-plane, tangential mid-plane, and top view) for the second NPA using the DOUBLE Monte-Carlo code and compared the results with the performance of the present NPA with tangential orientation. The DOUBLE code provides fast-atoms' emissivity functions along the NPA view-line. The position of the median of these emissivity functions is related to the location from where the measured signal originates. Further, we compared the difference between the real central T i used as a DOUBLE code input and the T iCX derived from the exponential decay of simulated energy spectra. The advantages and disadvantages of each NPA location are discussed. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2020 Electronic address https://iopscience.iop.org/article/10.1088/1742-6596/992/1/012009/pdf
Number of the records: 1