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Interpretation of the effects of electron cyclotron power absorption in pre-disruptive tokamak discharges in ASDEX Upgrade
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10.1063/1.4752423
/content/aip/journal/pop/19/9/10.1063/1.4752423
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/9/10.1063/1.4752423

Figures

Image of FIG. 1.
FIG. 1.

Amplitude and frequency evolution of the (2,1) with recovery by EC power from pre-disruptive condition at t > 1.4 s (left). T profiles of AUG shot #25179 during thermal quench associated with the (2,1) mode. Profiles at 1.4 s and 2.0 s refers to EC off, profiles at 1.5 s, 1.6 s, 1.88 s, 2.15 s and 2.2 s to EC on (right).

Image of FIG. 2.
FIG. 2.

As Fig. 1 for AUG shot #26817. Amplitude and frequency evolution of the (2,1) with recovery by EC power from pre-disruptive condition at t = 1.252 s (left). Profiles at 1.27 s, 1.29 s, and 1.32 s refer to EC on (right).

Image of FIG. 3.
FIG. 3.

On the left dependence of transport coefficients L on T for #25179 at n = 2.5 × 1019 m−3 (open markers) and n = 4.5 × 1019 m−3 (full markers): L (diamonds), L (circles), and L (squares). On the right same for #26817 for n = 3 × 1019 m−3 (open markers) and n = 4 × 1019 m−3 (full markers).

Image of FIG. 4.
FIG. 4.

On the left: Δ′ evolution for #25179 calculated with the approximated coefficient L = f ∼ 1.3 ε0.5 (solid line) and L coefficients in Eq. (4) (dashed line). On the right: same for #26817.

Image of FIG. 5.
FIG. 5.

rΔ′ for ε = 0.1, 0.2, 0.3, 0.4 with δ = 0.055 (left) and rΔ′ for ε = 0.1, 0.2, 0.3, 0.4 with δ = 0.11 (right).

Image of FIG. 6.
FIG. 6.

Perturbation of T for ε = 0.3 and  0.055–0.11 with EC deposition inside the resonant q = 2 radius.

Image of FIG. 7.
FIG. 7.

Left: (2,1) mode evolution in #25179 calculated with the approximated coefficient L ∝ ε0.5, Δ′ = −m (solid line) and L coefficients, Δ′ from Eq. (6) (dashed line); right: rΔ′ and rΔ′ evolution by using the conventional model (solid line) and new terms from Eqs. (4) and (6) (dashed line). Shaded areas indicate the locked mode location.

Image of FIG. 8.
FIG. 8.

Left: (2,1) mode evolution in #26817 calculated as in Fig. 7 with the approximated coefficient L ∝ ε0.5, Δ′ = −m (solid line) and L coefficients, Δ′ from Eq. (6) (dashed line to compare with thin solid line for ECH only) considering the combined effect of ECH + ECCD. The markers of experimental ECE data during the locked mode phase (1.26 s < t < 1.34 s) are unreliably detected. Right: rΔ′ and rΔ′ evolution by using the usual model (solid line) and new terms from Eqs. (4) and (6) (dashed line).

Image of FIG. 9.
FIG. 9.

On the left: #26817 ECE contour plot of (2,1) island chain with superimposed the modelled asymmetric island (solid line). The error bar of the EC deposition due to uncertainties in the equilibrium reconstruction is shown. On the right: GRE mode evolution calculated with the Δ′, Δ′ by the new models and Δ′ including η for symmetric (solid line) and asymmetric island (dashed line) calculated around the separatrix. Thin lines refer to the EC heating alone and thick lines to the combined ECH + ECCD effect.

Tables

Generic image for table
Table I.

L,T) coefficients. Values in bold refer to transition from banana to plateau regime.

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/content/aip/journal/pop/19/9/10.1063/1.4752423
2012-09-17
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Interpretation of the effects of electron cyclotron power absorption in pre-disruptive tokamak discharges in ASDEX Upgrade
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/9/10.1063/1.4752423
10.1063/1.4752423
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