Low frequency sawtooth precursor activity in ASDEX Upgrade

Papp, G [Papp, Gergely (nukleáris technika), szerző] Nukleáris Technikai Intézet (BME / TTK); Pokol, GI [Pokol, Gergő (Fúziós plazmafizika), szerző] Nukleáris Technika Tanszék (BME / TTK / NTI); Por, G [Pór, Gábor (Műszaki diagnosztika), szerző] Nukleáris Technika Tanszék (BME / TTK / NTI); Magyarkuti, A [Magyarkuti, András (fizika), szerző]; Lazanyi, N [Lazányi, Nóra (nukleáris technika), szerző] Nukleáris Technikai Intézet (BME / TTK); Horvath, L; Igochine, V; Maraschek, M

Angol nyelvű Tudományos Szakcikk (Folyóiratcikk)
Megjelent: PLASMA PHYSICS AND CONTROLLED FUSION 0741-3335 1361-6587 53 (6) Paper: 065007 , 17 p. 2011
  • SJR Scopus - Nuclear Energy and Engineering: D1
Azonosítók
Szakterületek:
    This paper describes the precursor activity observed in the ASDEX Upgrade tokamak before sawtooth crashes in various neutral beam heated plasmas, utilizing the soft x-ray diagnostic. In addition to the well-known (m, n) = (1,1) internal kink mode and its harmonics, a lower frequency mode is studied in detail. Power modulation of this mode is found to correlate with the power modulation of the (1, 1) kink mode in the quasistationary intervals indicating possible nonlinear interaction. Throughout the studied sawtooth crashes, the power of the lower frequency mode rose by several orders of magnitude just before the crash. In addition to its temporal behaviour, its spatial structure was estimated and the most likely value was found to be (1, 1). A possible role of this mode in the mechanism of the sawtooth crash is discussed.
    Hivatkozás stílusok: IEEEACMAPAChicagoHarvardCSLMásolásNyomtatás
    2020-08-10 21:41