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Mineral insulated cable assessment for inductive magnetic diagnostic sensors of a hot-wall tokamak
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SYSNO ASEP 0521626 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Mineral insulated cable assessment for inductive magnetic diagnostic sensors of a hot-wall tokamak Author(s) Torres, Andre (UFP-V)
Kovařík, Karel (UFP-V) RID, ORCID
Markovič, Tomáš (UFP-V) RID
Adámek, Jiří (UFP-V) RID, ORCID
Weinzettl, Vladimír (UFP-V) RID, ORCID
Carvalho, B.B. (PT)
Fernandes, H. (PT)
Hron, Martin (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RIDNumber of authors 9 Article number C09043 Source Title Journal of Instrumentation. - : Institute of Physics Publishing - ISSN 1748-0221
Roč. 14, č. 9 (2019)Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords Detector design and construction technologies and materials ; Plasma diagnostics-probes ; Special cables OECD category Fluids and plasma physics (including surface physics) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000519117900006 EID SCOPUS 85074385842 DOI 10.1088/1748-0221/14/09/C09043 Annotation The COMPASS-U tokamak, designed to be a 5 T magnetic field device with a full-metal first wall and operating at plasma-facing component temperatures up to 500°C, will start its operation in 2022 at IPP Prague. This device will address ITER and DEMO relevant plasma exhaust physics, including operation with liquid metal divertor. Inductive magnetic diagnostics based on conductive loops of different geometry and orientation are crucial for magnetic confinement fusion devices. Due to the high temperatures of the vacuum vessel upon which they will be operated, a suitable cable insulation needs to be chosen carefully. Mineral-insulated cables (MIC) have proven to be compatible with high baking temperatures. However, the steel sheath of MIC attenuates the response of the sensor at higher frequencies which could affect real-time plasma control feedback and magnetic equilibrium reconstruction. In this work, characterization and testing of multiple MgO MIC of different diameters was conducted. A variety of electrical property measurements, such as frequency attenuation, resistance and capacitance, for each cable is presented, both at low and high temperatures up to 300°C. Cutoff frequencies from 65 kHz to 335 kHz were identified and attributed to the shielding in a flux loop configuration. Using an external RLC circuit, the frequency response of MIC coils is compared to an electrical model for shielded coils, yielding an useful calibrated model for future probe prototypes with different geometries in the frequency range of interest. 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/10.1088/1748-0221/14/09/C09043
Number of the records: 1