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A total neutron yield constraint implemented to the RNC emissivity reconstruction on ITER tokamak
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SYSNO ASEP 0538149 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title A total neutron yield constraint implemented to the RNC emissivity reconstruction on ITER tokamak Author(s) Mikszuta-Michalik, K. (PL)
Imríšek, Martin (UFP-V) RID
Esposito, B. (IT)
Marocco, D. (IT)
Mlynář, Jan (UFP-V) RID
Ficker, Ondřej (UFP-V) ORCIDNumber of authors 6 Article number 111840 Source Title Fusion Engineering and Design. - : Elsevier - ISSN 0920-3796
Roč. 160, November (2020)Number of pages 8 s. Language eng - English Country CH - Switzerland Keywords iter ; Plasma diagnostics ; Radial neutron camera ; Tomography Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000588143300034 EID SCOPUS 85086720071 DOI 10.1016/j.fusengdes.2020.111840 Annotation The purpose of the ITER Radial Neutron Camera (RNC) is the measurement of the plasma neutron emissivity profile [neutrons∙s−1 m-3] for burn control purposes. The present RNC design consists of 22 collimated detector systems providing a set of line-integrated neutron measurements [neutrons∙s−1 m-2] with full coverage of the plasma poloidal cross-section, the neutron emissivity can be recovered from the line-integrated measurements by means of dedicated reconstruction techniques (1D spatial inversion, 2D tomography). The present paper focuses on the evaluation of the improvement in the RNC 2D reconstruction of the neutron emissivity obtained by using the total neutron yield value provided by an independent diagnostic as additional constraint in the tomography procedure. The analysis was performed using a tomography code based on the Minimum Fisher Regularization (MFR). A clear improvement of the neutron emissivity reconstruction has been observed when the total neutron yield constraint is considered. The improvement is seen in: extension of the spatial region in which the accuracy of the reconstruction is better than 10 %, better reconstruction of peaked emissivity profiles, and robustness against measurements noise and line of sight data loss. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2021 Electronic address https://www.sciencedirect.com/science/article/pii/S0920379620303884
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