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Numerical modelling for beam duct heat loads calculations and application to the new 1 MW neutral beam injector in the COMPASS tokamak
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SYSNO ASEP 0565919 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Numerical modelling for beam duct heat loads calculations and application to the new 1 MW neutral beam injector in the COMPASS tokamak Author(s) Jaulmes, Fabien (UFP-V) ORCID
Zadvitskiy, Georgiy (UFP-V)
Bogár, Klára (UFP-V) ORCID
Mysiura, Illia (UFP-V)
Varju, Jozef (UFP-V) ORCID
Jeřáb, Martin (UFP-V) ORCID
Komm, Michael (UFP-V) RID, ORCID
Imríšek, Martin (UFP-V) RIDNumber of authors 8 Article number 125001 Source Title Plasma Physics and Controlled Fusion. - : Institute of Physics Publishing - ISSN 0741-3335
Roč. 64, č. 12 (2022)Number of pages 13 s. Language eng - English Country GB - United Kingdom Keywords beam ; duct ; fast ion ; heat load ; nbi Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects EF16_019/0000768 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2018117 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000868886200001 EID SCOPUS 85141031959 DOI 10.1088/1361-6587/ac985e Annotation We introduce detailed numerical modelling of the fast neutral particles inside the duct of a new neutral beam injector (NBI) recently installed at the COMPASS tokamak (major radius R 0 = 0.56 m , vessel midplane minor radius a = 0.23 m , toroidal field B t = 0.9-2.1 T ). This new NBI system is able to deliver 1 M W power to the plasma at nominal injection energy of 80 k e V . Collisions with the background neutrals inside the beam duct give birth to fast ions according to the density of the gas and tabulated cross-sections. The ion trajectories are then computed in the complete 3D magnetic field, showing the importance of the stray magnetic field and the magnitude of the field within the gap in between toroidal coils.During the experimental campaign dedicated to the new 1 MW NBI, the beam duct heating was measured by a row of thermocouples located on the top-half of the beam duct. The fast ions collisions with the duct wall cause a local temperature increase with a characteristic pattern. In COMPASS, the location of the fast ions power deposition measured experimentally is in qualitative agreement with modelling of ion losses when following them after the re-ionization process. We trace back the details of the orbits corresponding to deposition at the hot-spot inside the beam duct. Quantitative comparison between the experiment and the simulation shows that a larger than expected amount of neutral gas was inside the duct and this study will guide the design of the future NBI duct in COMPASS Upgrade. 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/ac985e
Number of the records: 1