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Characterisation of the auxiliary heating power delivered by the 40 keV neutral beam injectors on the COMPASS tokamak
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SYSNO ASEP 0566724 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Characterisation of the auxiliary heating power delivered by the 40 keV neutral beam injectors on the COMPASS tokamak Author(s) Bogár, Klára (UFP-V) ORCID
Varju, Jozef (UFP-V) ORCID
Havlíček, Josef (UFP-V) RID, ORCID
Stöckel, Jan (UFP-V) RID
Podolník, Aleš (UFP-V) ORCID
Hron, Martin (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RIDNumber of authors 7 Article number 025004 Source Title Plasma Physics and Controlled Fusion. - : Institute of Physics Publishing - ISSN 0741-3335
Roč. 65, č. 2 (2023)Number of pages 14 s. Language eng - English Country GB - United Kingdom Keywords neutral beam injection ; auxilliary heating ; COMPASS tokamak ; power balance ; beam duct scraping Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects LM2018117 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF16_019/0000768 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000901498800001 EID SCOPUS 85145007729 DOI 10.1088/1361-6587/aca629 Annotation Two identical neutral beam injectors (NBIs) have been installed on the COMPASS tokamak. Each of them is capable of producing a deuterium (or hydrogen, helium) neutral beam with nominal power of up to 400 kW at 40 keV. Since the COMPASS tokamak is a compact machine, the design of the neutral beams was carefully optimized to fit the neutral beam through the narrow ports of the tokamak. However, once the neutral beams are operated out of the scope of their optimal parameters, additional power losses occur due to neutral beam scraping. This article investigates the amount of power loss due to neutral beam scraping. The losses are calculated using the neutral beam models and measured neutral beam parameters. The calculated results are compared with the measured power delivered into the plasma. Two different neutral beam models are employed. One describes the neutral beam as a sum of small beamlets, which are Gaussian-like. The second one describes the neutral beam as a single Gaussian beam. The amount of the power lost to scraping is determined by both models and compared. Neutral beam parameters, the input parameters for both models, are derived from the Doppler-shifted spectra emitted by fast neutral atoms. It is shown that when operating NBIs at nominal parameters, the scraping losses are negligible ( < Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2023 Electronic address https://iopscience.iop.org/article/10.1088/1361-6587/aca629
Number of the records: 1