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Conceptual design of reciprocating probes and material-testing manipulator for tokamak COMPASS Upgrade
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SYSNO ASEP 0555588 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Conceptual design of reciprocating probes and material-testing manipulator for tokamak COMPASS Upgrade Author(s) Lukeš, S. (CZ)
Horáček, Jan (UFP-V) RID, ORCID
Veselovský, Viktor (UFP-V)
Vondráček, Petr (UFP-V) RID, ORCID
Šesták, David (UFP-V) RID
Adámek, Jiří (UFP-V) RID, ORCID
Weinzettl, Vladimír (UFP-V) RID, ORCID
Ďuran, Ivan (UFP-V) RID, ORCIDNumber of authors 8 Article number C02007 Source Title Journal of Instrumentation. - : Institute of Physics Publishing - ISSN 1748-0221
Roč. 17, č. 2 (2022)Number of pages 7 s. Action European Conference on Plasma Diagnostics Event date 07.06.2021 - 11.06.2021 VEvent location online Country CZ - Czech Republic Event type EUR Language eng - English Country GB - United Kingdom Keywords Nuclear instruments and methods for hot plasma diagnostics ; Overall mechanics design (support structures and materials, vibration analysis etc.) ; Plasma diagnostics probes 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) GA22-03950S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000791423900012 EID SCOPUS 85125640769 DOI 10.1088/1748-0221/17/02/C02007 Annotation Three new in-vessel manipulators are designed and built for the new COMPASS Upgrade tokamak with uniquely high vessel temperature (250-500 °C) and heat flux density (perpendicular to divertor surface q ⊥ ∼80 MW/m2 and q ∼GW/m2 at separatrix), which challenges the edge plasma diagnostics. Here we show their detailed engineering designs supported by heat conduction and mechanical models. Deep reciprocation of electrostatic probes near the separatrix should be possible by optimizing older concepts in (a) the head and probe geometry, (b) strongly increasing the deceleration up to 100× gravity by springs and strengthening the manipulator mechanical structure. One reciprocates close to the region of edge plasma influx (the outer midplane), the other at the plasma sink (between the outer divertor strike point and X-point), for studying the plasma divertor (impurity-seeded) detachment and liquid metal vapor transport. Both probe heads are equipped with a set of ball-pen and Langmuir probes, measuring reliably and extremely fast (10-6 s) local (1 mm resolution) plasma potential, density, electron temperature and heat flux and even ion temperature with 10-5 s resolution. The divertor manipulator (without reciprocation) will place various material test targets at the outer divertor. Unique will be its capability to increase 15× the surface heat flux with respect to the surrounding tungsten tiles just by controllable surface inclination of the test targets. We plan to test liquid metal targets where such inclined surface was found critical to achieve the desired mode with lithium vapor shielding. Even in the conservative expected performance of COMPASS Upgrade, we predict to reach and survive the EU DEMO relevant heat fluxes. 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/10.1088/1748-0221/17/02/C02007
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