Počet záznamů: 1
Understanding and suppressing the near Scrape-Off Layer in inboard-limited plasmas in TCV.
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SYSNO ASEP 0484465 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Understanding and suppressing the near Scrape-Off Layer in inboard-limited plasmas in TCV. Tvůrce(i) Nespoli, F. (CH)
Labit, B. (CH)
Furno, I. (CH)
Horáček, Jan (UFP-V) RID, ORCID
Tsui, C.K. (US)
Boedo, J. A. (US)
Maurizio, R. (CH)
Reimerdes, H. (CH)
Theiler, C. (CH)
Ricci, P. (CH)
Halpern, F.D. (CH)
Sheikh, U. (CH)
Verhaegh, K. (CH)
Pitts, R.A. (FR)
Militello, F. (GB)Číslo článku 126029 Zdroj.dok. Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515
Roč. 57, č. 12 (2017)Poč.str. 17 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. AT - Rakousko Klíč. slova tokamak ; TCV ; scrape-off layer ; heat flux ; limiter ; infrared thermography ; Langmuir probes Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) CEP GA15-10723S GA ČR - Grantová agentura ČR Institucionální podpora UFP-V - RVO:61389021 UT WOS 000411702700003 EID SCOPUS 85029934892 DOI 10.1088/1741-4326/aa84e0 Anotace In inboard-limited plasmas, the scrape-off layer (SOL) shows two regions: the near SOL, extending a few mm from the last closed flux surface (LCFS), characterized by a steep gradient of the parallel heat flux radial profile, and a far SOL, typically some cm wide, with flatter heat flux profiles. The physics of the near SOL is investigated in TCV with two series of experiments featuring deuterium and helium plasmas, in which the plasma current, density and elongation have been varied. The parallel heat flux profiles are measured on the limiter by means of infrared thermography. For the first time, the near SOL is reported to disappear for low plasma current or at high density, for values of the SOL collisionality ν SOL corresponding to a conduction-limited regime. The power in the near SOL ΔPSOL is shown to decrease with the normalized Spitzer resistivity v as PSOL alpha ν-1. The floating potential profiles, measured at the limiter using flush-mounted Langmuir probes (LP), show the presence of non-ambipolar currents, and their relation to the presence of a velocity shear layer is discussed. The shearing rate is shown to strictly correlate with the power in the near SOL PSOL, consistently with a recent theoretical model. Measurements of the near SOL on the Low Field Side (LFS) are performed using a reciprocating Langmuir probe (RP). The near SOL is reported to vanish simultaneously at the LFS and at the limiter. The near and far SOL widths are compared with the predictions from existing theoretical models, to which empirical corrections with resistivity and elongation are proposed Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2018
Počet záznamů: 1