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Studies of runaway electrons via Cherenkov effect in tokamaks
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SYSNO ASEP 0508698 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Studies of runaway electrons via Cherenkov effect in tokamaks Author(s) Zebrowski, J. (PL)
Jakubowski, L. (PL)
Rabinski, M. (PL)
Sadowski, M. J. (PL)
Jakubowski, M.J. (PL)
Kwiatkowski, R. (PL)
Malinowski, K. (PL)
Mirowski, R. (PL)
Mlynář, Jan (UFP-V) RID
Ficker, Ondřej (UFP-V) ORCID
Weinzettl, Vladimír (UFP-V) RID, ORCID
Causa, F. (IT)Number of authors 12 Article number 012002 Source Title Journal of Physics: Conference Series, 1046. - Bristol : IOP Publishing Ltd., 2018 - ISSN 1742-6588 Pages roč. 959, č. 1 (2018) Number of pages 8 s. Publication form Online - E Action International Conferences on Research and Applications of Plasmas (PLASMA) Event date 17.09.2017 - 22.09.2017 VEvent location Varšava Country PL - Poland Event type WRD Language eng - English Country GB - United Kingdom Keywords runaway electrons ; tokamak Subject RIV BL - Plasma and Gas Discharge Physics OECD category Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect) R&D Projects LM2015045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFP-V - RVO:61389021 UT WOS 000431678000002 EID SCOPUS 85042941915 DOI 10.1088/1742-6596/959/1/012002 Annotation The paper concerns measurements of runaway electrons (REs) which are generated during discharges in tokamaks. The control of REs is an important task in experimental studies within the ITER-physics program. The NCBJ team proposed to study REs by means of Cherenkov-type detectors several years ago. The Cherenkov radiation, induced by REs in appropriate radiators, makes it possible to identify fast electron beams and to determine their spatial- and temporal-characteristics. The results of recent experimental studies of REs, performed in two tokamaks COMPASS in Prague and FTU in Frascati, are summarized and discussed in this paper. Examples of the electron-induced signals, as recorded at different experimental conditions and scenarios, are presented. Measurements performed with a three-channel Cherenkov-probe in COMPASS showed that the first fast electron peaks can be observed already during the current ramp-up phase. A strong dependence of RE-signals on the radial position of the Cherenkov probe was observed. The most distinct electron peaks were recorded during the plasma disruption. The Cherenkov signals confirmed the appearance of post-disruptive RE beams in circular-plasma discharges with massive Ar-puffing. During experiments at FTU a clear correlation between the Cherenkov detector signals and the rotation of magnetic islands was identified. 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/10.1088/1742-6596/959/1/012002/pdf
Number of the records: 1