2016
DOI: 10.1063/1.4949342
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Non-linear dynamics of compound sawteeth in tokamaks

Abstract: Compound sawteeth is studied with the XTOR-2F code. Non-linear full 3D magnetohydrodynamic simulations show that the plasma hot core is radially displaced and rotates during the partial crash, but is not fully expelled out of the q = 1 surface. Partial crashes occur when the radius of the q = 1 surface exceeds a critical value, at fixed poloidal beta. This critical value depends on the plasma elongation. The partial crash time is larger than the collapse time of an ordinary sawtooth, likely due to a weaker dia… Show more

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Cited by 8 publications
(8 citation statements)
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“…As argued in [9,10], partial sawtooth reconnection may be associated with non-monotonic q profiles with q min close to or smaller than unity. The pulsating island scenario observed in our simulations is associated with relatively flat, or slightly non-monotonic, q profiles.…”
Section: Benchmarking M3d Against Visco-tearing Regimementioning
confidence: 86%
See 1 more Smart Citation
“…As argued in [9,10], partial sawtooth reconnection may be associated with non-monotonic q profiles with q min close to or smaller than unity. The pulsating island scenario observed in our simulations is associated with relatively flat, or slightly non-monotonic, q profiles.…”
Section: Benchmarking M3d Against Visco-tearing Regimementioning
confidence: 86%
“…However, as the value of V is increased, the nonlinear behaviour changes from complete reconnection to a pulsating m/n = 1 magnetic island at intermediate values of V, finally to a situation where a steady state m/n = 1 magnetic island is formed at large values of V > 100. As argued in section 6 of this article, the pulsating island scenario may be relevant to the interpretation of partial sawtooth reconnection [9,10] sometimes observed in the experiments, while the steady state magnetic island regime may be related to the observation of the snake phenomenon [11,12]. The viscosity parameter V is also refereed to as the magnetic Prandtl number [13].…”
Section: Introductionmentioning
confidence: 89%
“…The occurrence of a q min indicates a non-monotonic q profile, like in JET reversed shear discharges. The appearance of such q profiles after a sawtooth crash was recently reported and studied by [42], in sawtooth simulations of Ohmic plasmas using the XTOR-2F code [1]. Hence, the evolution of postcrash q profiles depending on the values of the total current in XTOR-2F simulations can be used to examine Tore Supra measurements described in the previous section, even if fast ions are not included in the simulation.…”
Section: Reversed Q Profiles In Xtor-2f Sawtooth Simulationsmentioning
confidence: 84%
“…A discussion on the mode resolution used in the XTOR-2F simulations to describe sawtooth cycles can be found in Refs. [27], [33], [34].…”
Section: Non-linear Mhd Model In the Xtor-2f Codementioning
confidence: 99%