Physics and control of external kink instabilities with realistic 3D boundaries: A challenge for modern experiments and modeling

Tommaso Bolzonella, Matteo Baruzzo, Yueqiang Liu, Giuseppe Marchiori, Go Matsunaga, Leonardo Pigatto, Anton Soppelsa, Manabu Takechi, Fabio Villone

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2 Citations (Scopus)

Abstract

In present day devices, the external kink ideal MHD instability establishes hard operational boundaries for both the tokamak and the Reversed Field Pinch (RFP) configurations. An interesting feature of it is that its growth rate critically depends on the device passive boundary characteristics and this can slow it down to time scales accessible to modern real time feedback control systems, normally using external active coils as actuators. 3D passive structures and external fields play a key role in determining physics and control of this instability. This is in particular true for equilibria with multimodal unstable RWM spectra where modes can couple to specific 3D features of passive and active magnetic boundary. In the paper we will present recent data and simulations from RFX-mod, a medium size (R = 2m, a = 0.459 m) device able to confine RFP and tokamak plasmas with currents up to 2MA and 120 kA, respectively. Successful quantitative modeling of multimodal RWM control experiments performed using different actuator configurations will be presented and commented.
Original languageEnglish
Article number3402081
Pages (from-to)-
JournalPlasma and Fusion Research
Volume9
Issue numberSpecialIssue2
DOIs
Publication statusPublished - 2014
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Bolzonella, T., Baruzzo, M., Liu, Y., Marchiori, G., Matsunaga, G., Pigatto, L., ... Villone, F. (2014). Physics and control of external kink instabilities with realistic 3D boundaries: A challenge for modern experiments and modeling. Plasma and Fusion Research, 9(SpecialIssue2), -. [3402081]. https://doi.org/10.1585/pfr.9.3402081