Number of the records: 1
Scaling of the MHD perturbation amplitude required to trigger a disruption and predictions for ITER
- 1.
SYSNO ASEP 0460364 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Scaling of the MHD perturbation amplitude required to trigger a disruption and predictions for ITER Tvůrce(i) de Vries, P.C. (FR)
Pautasso, G. (DE)
Nardon, E. (FR)
Cahyna, Pavel (UFP-V) RID
Gerasimov, S. (GB)
Havlíček, Josef (UFP-V) RID, ORCID
Hender, T.C. (GB)
Huijsmans, G.T.A. (FR)
Lehnen, M. (FR)
Maraschek, M. (DE)
Markovič, Tomáš (UFP-V) RID
Snipes, J.A. (FR)Číslo článku 026007 Zdroj.dok. Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515
Roč. 56, č. 2 (2016)Poč.str. 10 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. AT - Rakousko Klíč. slova disruptions ; locked modes ; MHD instabilities ; ITER ; COMPASS tokamak Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) CEP LM2011021 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UFP-V - RVO:61389021 UT WOS 000367934800007 EID SCOPUS 84957002589 DOI https://doi.org/10.1088/0029-5515/56/2/026007 Anotace The amplitude of locked instabilities, likely magnetic islands, seen as precursors to disruptions has been studied using data from the JET, ASDEX Upgrade and COMPASS tokamaks. It was found that the thermal quench, that often initiates the disruption, is triggered when the amplitude has reached a distinct level. This information can be used to determine thresholds for simple disruption prediction schemes. The measured amplitude in part depends on the distance of the perturbation to the measurement coils. Hence the threshold for the measured amplitude depends on the mode location (i.e. the rational q-surface) and thus indirectly on parameters such as the edge safety factor, q(95), and the internal inductance, li(3), that determine the shape of the q-profile. These dependencies can be used to set the disruption thresholds more precisely. For the ITER baseline scenario, with typically q(95) = 3.2, li(3) = 0.9 and taking into account the position of the measurement coils on ITER, the maximum allowable measured locked mode amplitude normalized to engineering parameters was estimated to be a.B-ML(r(c))/I-p = 0.92 m mT/MA, or directly as a fraction edge poloidal magnetic field: BML(r(c))/B theta(a) = 5 . 10(-3). But these values decrease for operation at higher q(95) or lower li(3). The analysis found furthermore that the above empirical criterion to trigger a thermal quench is more consistent with a criterion derived with the concept of a critical island size, i.e. the thermal quench seemed to be triggered at a distinct island width. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2017
Number of the records: 1