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Testing a model for triggering sawtooth oscillations in tokamaks
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10.1063/1.2218329
/content/aip/journal/pop/13/7/10.1063/1.2218329
http://aip.metastore.ingenta.com/content/aip/journal/pop/13/7/10.1063/1.2218329

Figures

Image of FIG. 1.
FIG. 1.

Magnetic profile as a function of the minor radius just before and just after a sawtooth crash for JET discharge 33131 with magnetic reconnection fraction, , set at 40% (top panel) and 80% (bottom panel).

Image of FIG. 2.
FIG. 2.

Time evolution for the measured central electron temperature is shown in the top panel for JET discharge 33140, with vertical dotted lines marking the sawtooth crashes. Components of the Porcelli model are shown in the other four panels from a simulation using a 50% magnetic reconnection fraction. The left and right hand sides of Eq. (2) and Eq. (3) are shown in the second and third panels from the top, respectively. The three terms in the first part of Eq. (4) are shown in the fourth panel and the two terms in the second part of Eq. (4) are shown in the fifth panel.

Image of FIG. 3.
FIG. 3.

Time evolution of the measured central electron temperature is shown for JET discharge 33131 in the top panel. The rf heating power (dotted line) and NBI power (solid line) are shown in the middle panel. The measured sawtooth period (solid line) and the sawtooth period from simulations with 45% magnetic reconnection (dashed line) are shown in the bottom panel.

Image of FIG. 4.
FIG. 4.

Sawtooth period as a function of the magnetic reconnection fraction for TFTR discharge 105294. The central electron temperature is shown as a function of time in the top panel. The experimental sawtooth periods are indicated as solid lines in the lower three panels. The sawtooth periods are indicated with a dotted line in the second panel, a dashed line in the third panel, and a chained line in the fourth (bottom) panel for a simulation using a 30%, 40%, and 60% magnetic reconnection fraction.

Image of FIG. 5.
FIG. 5.

The resistive effective growth rate in the effective ion-kinetic regime, , is shown as a solid line and the thermal ion diamagnetic frequency, , is shown as a dashed line as a function of time from simulations of TFTR discharge 45980 with a 30% magnetic reconnection fraction in the top panel and a 60% magnetic reconnection fraction in the bottom panel.

Image of FIG. 6.
FIG. 6.

Time evolution for the measured central electron temperature is shown in the top panel for TFTR discharge 105340, with vertical dotted lines marking the sawtooth crashes. Components of the Porcelli model are shown in the other four panels from a simulation using a 35% magnetic reconnection fraction. The left and right hand sides of Eq. (2) and Eq. (3) are shown in the second and third panels from the top, respectively. The three terms in the first part of Eq. (4) are shown in the fourth panel and the two terms in the second part of Eq. (4) are shown in the fifth panel.

Image of FIG. 7.
FIG. 7.

Average relative offset as a function of magnetic reconnection fraction for the median sawtooth periods predicted by the Porcelli model in BALDUR simulations of the 8 JET discharge time intervals (dashed line) and the 12 TFTR discharge time intervals (dotted line), as well as the total of the 20 discharge time intervals.

Tables

Generic image for table
Table I.

Definition of variables.

Generic image for table
Table II.

Plasma parameters for the TFTR L-mode and JET H-mode discharges.

Generic image for table
Table III.

Median sawtooth periods for the TFTR L-mode and JET H-mode discharges.

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/content/aip/journal/pop/13/7/10.1063/1.2218329
2006-07-17
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Testing a model for triggering sawtooth oscillations in tokamaks
http://aip.metastore.ingenta.com/content/aip/journal/pop/13/7/10.1063/1.2218329
10.1063/1.2218329
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