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Feasibility study of fast swept divertor strike point suppressing transient heat fluxes in big tokamaks.
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SYSNO ASEP 0481373 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Feasibility study of fast swept divertor strike point suppressing transient heat fluxes in big tokamaks. Author(s) Horáček, Jan (UFP-V) RID, ORCID
Cunningham, G. (GB)
Entler, Slavomír (UFP-V) ORCID
Dobias, P. (FR)
Duban, R. (CZ)
Imríšek, Martin (UFP-V) RID
Markovič, Tomáš (UFP-V) RID
Havlíček, Josef (UFP-V) RID, ORCID
Enikeev, R. (RU)Source Title Fusion Engineering and Design. - : Elsevier - ISSN 0920-3796
Roč. 123, November (2017), s. 646-649Number of pages 4 s. Publication form Print - P Action SOFT 2016: Symposium on Fusion Technology /29./ Event date 05.09.2016 - 09.09.2016 VEvent location Prague Country CZ - Czech Republic Event type WRD Language eng - English Country CH - Switzerland Keywords DEMO ; ELM ; Divertor ; Heat flux ; Tokamak Subject RIV JF - Nuclear Energetics OECD category Nuclear related engineering R&D Projects GA16-14228S GA ČR - Czech Science Foundation (CSF) LM2015045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) 8D15001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LG14002 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFP-V - RVO:61389021 UT WOS 000418992000134 EID SCOPUS 85011103413 DOI 10.1016/j.fusengdes.2017.01.027 Annotation n order to avoid metal surface melting of divertor targets of big tokamak fusion reactors by localized ELM heat loads, sudden detachment loss or VDEs, we study a new technique of spreading the heat flux by harmonic divertor strike point sweeping using a dedicated divertor coil. We ran 2D dynamic heat conduction simulation using real infra-red data of large ELMs heat fluxes on JET divertor target, rescaled for EU DEMO reactor (B-0 = 6 T, I-p =21 MA, R-0 = 9 m). Aiming for the surface temperature suppression factor of 4, this requires sweeping with amplitude*frequency=7cm*2 kHz. Building the divertor coil out of 27 tons of copper, this requires 0.8 MW cooling. Triggered by analog divertor heat flux signal, dedicated dynamic Fiesta simulation scenario requires 54 capacitive energy storages at 1500 V (6mF) discharged into 54 divertor coils, each with AC current of 130kA for each ELM event for similar to 4 ms (with waiting time 40 ms). The Ix B-tor forces would yield less than 0.1 mm rotational vibrations of the coil at the ELM frequency (similar to 20 Hz). The DEMO divertor surface temperature suppression reaches factor of 9 with 18 kV, 20 cm, 7.5 kHz, 400 kA. We also calculate system requirements (0.6mF, 5 kV & 60kA -> suppression factor = 2) for ASDEX Upgrade using the upper divertor coil. Since we found no show-stoppers, this technique seems attractive for big tokamaks. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
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