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Real-time plasma position reflectometry system development and integration on COMPASS tokamak
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SYSNO ASEP 0534527 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Real-time plasma position reflectometry system development and integration on COMPASS tokamak Author(s) Lourenço, P. D. (PT)
Santos, J.M. (PT)
Havránek, Aleš (UFP-V) ORCID
Bogár, Ondrej (UFP-V) ORCID
Havlíček, Josef (UFP-V) RID, ORCID
Zajac, Jaromír (UFP-V) RID
Silva, A. (PT)
Batista, A.J.N. (PT)
Hron, Martin (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RID
Fernandes, H. (PT)Number of authors 11 Article number 112017 Source Title Fusion Engineering and Design. - : Elsevier - ISSN 0920-3796
Roč. 160, November (2020)Number of pages 11 s. Language eng - English Country CH - Switzerland Keywords COMPASS tokamak ; Distributed feedback ; MARTe framework ; Plasma position reflectometry ; Real-time Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects LM2015045 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 000588143300085 EID SCOPUS 85091996338 DOI 10.1016/j.fusengdes.2020.112017 Annotation O-mode frequency-modulated continuous wave (FMCW) reflectometry provides an alternative to magnetic measurements in the determination of the plasma separatrix position for plasma position control. This type of measurement proves to be particularly attractive for the control of future fusion reactors where the harsh radiation environment may damage magnetic probes or induce non-compensable measurement drifts. Plasma position reflectometry (PPR), first demonstrated in ASDEX-Upgrade, is a control technique that is increasingly important to validate in diversified experimental devices and relevant plasma regimes. The COMPASS tokamak provides suitable conditions for such advanced demonstrations and regular PPR operation and development, thanks to its O-mode reflectometer and Multi-Threaded Application Real-Time executor (MARTe) based real-time control system. Herein we present the integration of a PPR system on COMPASS, both at hardware and software levels. Reflectometry swept measurements require signals to be acquired in bursts of data and streamed to the corresponding MARTe-PPR node through PCIe® fibre-optic links. The data transferred in real-time is used to reconstruct the radial density profiles from which the outer separatrix position is estimated. This estimate is then delivered to the central MARTe controller node via a dedicated Xilinx® Aurora® link at a rate matching COMPASS's 500 μs slow control cycle. The implemented system systematically met the required latency specifications, being able to deliver an estimation of the plasma radial position capable of successfully replacing the corresponding magnetic measurements in the plasma position feedback control loops. 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/abs/pii/S0920379620305652?via%3Dihub
Number of the records: 1