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1.	Overview of the JET results in support to ITER 2017 In: Nuclear Fusion. - : IOP PUBLISHING LTD. - 0029-5515 .- 1741-4326. ; 57:10 Journal article (peer-reviewed)
2.	Lanctot, M. J., et al. (author) Impact of toroidal and poloidal mode spectra on the control of non-axisymmetric fields in tokamaks 2017 In: Physics of Plasmas. - : American Institute of Physics (AIP). - 1070-664X .- 1089-7674. ; 24:5 Journal article (peer-reviewed)abstract In several tokamaks, non-axisymmetric magnetic field studies show that applied magnetic fields with a toroidal harmonic n = 2 can lead to disruptive n = 1 locked modes. In Ohmic plasmas, n = 2 magnetic reconnection thresholds in otherwise stable discharges are readily accessed at edge safety factors q similar to 3, low density, and low rotation. Similar to previous studies with n = 1 fields, the thresholds are correlated with the "overlap" field computed with the IPEC code. The overlap field quantifies the plasma-mediated coupling of the external field to the resonant field. Remarkably, the "critical overlap fields" at which magnetic islands form are similar for applied n = 1 and 2 fields. The critical overlap field increases with plasma density and edge safety factor but is independent of the toroidal field. Poloidal harmonics m> nq dominate the drive for resonant fields while m < nq harmonics have a negligible impact. This contrasts with previous results in H-mode discharges at high plasma pressure in which the toroidal angular momentum is sensitive to low poloidal harmonics. Together, these results highlight unique requirements for n > 1 field control including the need for multiple rows of coils to control selected plasma parameters for specific functions (e.g., rotation control or ELM suppression).

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Type of publication: journal article (2)

Type of content: peer-reviewed (2)

Author/Editor: Esposito, B. (1); Jones, G. (1); Li, L. (1); Liu, Y. (1); Price, D. (1); Spagnolo, S. (1); show more...; Walker, R. (1); Yao, L. (1); Young, C. (1); Buchanan, J. (1); Thomas, P. (1); Kaufman, M (1); Taylor, D (1); Baker, A. (1); Clark, M. (1); Martin, A. (1); Meyer, H. (1); Gallagher, J. (1); Schneider, M. (1); Day, C. (1); Garcia, J. (1); Page, A. (1); Zhang, W. (1); Morris, J. (1); Lee, S (1); Williams, J (1); Wood, R (1); Williams, M (1); Bowden, M. (1); Pereira, A (1); Afzal, M (1); Young, R. (1); Rodrigues, P (1); Silva, C. (1); Rodriguez, J. (1); Duran, I (1); Mayer, M. (1); Sinha, A. (1); Kundu, A. (1); Lopez, J. M. (1); Thomas, J. (1); Martin, Y. (1); Wang, N. (1); Krieger, K. (1); Murphy, S. (1); Godwin, J (1); Alper, B (1); Ambrosino, G (1); Amosov, V (1); Anghel, M (1); show less...

University: Royal Institute of Technology (2); Uppsala University (2); Chalmers University of Technology (1)

Language: English (2)

Research subject (UKÄ/SCB): Natural sciences (2)

Year: 2017 (2)Undo refine

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