Dimensionless scaling of the critical beta for onset of a neoclassical tearing mode

R.J. La Haye, R.J. Buttery, S. Guenter, G.T.A. Huysmans, M. Maraschek, H.R. Wilson

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

97 Citaten (Scopus)

Samenvatting

The islands from tearing modes driven unstable and sustained by the helically perturbed neoclassical bootstrap current often provide the practical limit to long-pulse, high confinement tokamak operation. The destabilization of such "metastable" plasmas depends on a "seed" island exceeding a threshold. A database from similar regimes [high confinement H-mode with periodic edge localized modes (ELMs) and periodic central sawteeth] was compiled from the tokamaks ASDEX Upgrade (AUG) [Plasma Phys. Controlled Fusion 41, 767 (1999)], DIII-D [Nucl. Fusion 38, 987 (1998)], and JET (Joint European Torus) [Plasma Phys. Controlled Fusion 41, B1 (1999)]. A comparison is made of the measured critical beta for onset of the m/n=3/2 mode (m and n being the poloidal and toroidal Fourier harmonics, respectively) to a model in terms of dimensionless parameters for the seed and threshold islands. This modeling is then used for extrapolation to a reactor-grade tokamak design such as ITER/FDR (International Thermonuclear Experimental Reactor/Final Design Report) [Nucl. Fusion 39, 2137 (1999)]; this indicates that the seed island from sawteeth could be too small to sufficiently disturb the metastable plasma and excite the m/n=3/2 neoclassical tearing mode.
Originele taal-2Engels
Pagina's (van-tot)3349-3359
TijdschriftPhysics of Plasmas
Volume7
Nummer van het tijdschrift8
DOI's
StatusGepubliceerd - 1 aug 2000
Extern gepubliceerdJa

Vingerafdruk Duik in de onderzoeksthema's van 'Dimensionless scaling of the critical beta for onset of a neoclassical tearing mode'. Samen vormen ze een unieke vingerafdruk.

  • Citeer dit

    La Haye, R. J., Buttery, R. J., Guenter, S., Huysmans, G. T. A., Maraschek, M., & Wilson, H. R. (2000). Dimensionless scaling of the critical beta for onset of a neoclassical tearing mode. Physics of Plasmas, 7(8), 3349-3359. https://doi.org/10.1063/1.874199