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Gyrokinetic microinstabilities in ASDEX Upgrade edge plasmas
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10.1063/1.3000132
/content/aip/journal/pop/15/10/10.1063/1.3000132
http://aip.metastore.ingenta.com/content/aip/journal/pop/15/10/10.1063/1.3000132

Figures

Image of FIG. 1.
FIG. 1.

Safety factor profile for shot #20431 at .

Image of FIG. 2.
FIG. 2.

Temperature and density profiles for shot #20431 at . The vertical lines indicate the positions of three of the flux surfaces we simulated. As our focus is on the edge region, the fourth flux surface is excluded from this figure.

Image of FIG. 3.
FIG. 3.

Temperature and density profiles for the L-mode phase of shot #22838.

Image of FIG. 4.
FIG. 4.

Temperature and density profiles for the H-mode phase of shot #22838.

Image of FIG. 5.
FIG. 5.

Growth rate and frequency spectra at . Negative frequencies (corresponding to the electron drift direction) are indicated by (−).

Image of FIG. 6.
FIG. 6.

Growth rate and frequency spectra at . Negative frequencies are indicated by (−).

Image of FIG. 7.
FIG. 7.

Growth rate and frequency spectra at , with zero ion temperature gradient. The displayed frequencies are all negative.

Image of FIG. 8.
FIG. 8.

Growth rate and frequency spectra at in the L-mode phase of shot #22838. Negative frequencies are indicated by (−), while the black bar separates the ITG and ETG mode frequencies, which have similar values but a different sign.

Image of FIG. 9.
FIG. 9.

Dependence of the microtearing mode on the ion temperature gradient.

Image of FIG. 10.
FIG. 10.

Dependence of the microtearing mode on the electron temperature gradient.

Image of FIG. 11.
FIG. 11.

Dependence of the microtearing mode on the density gradient. At high gradient, a TEM dominates.

Image of FIG. 12.
FIG. 12.

Dependence of the microtearing mode on .

Image of FIG. 13.
FIG. 13.

Parallel mode structure of the microtearing instability. The electrostatic potential shows an odd parity, while the electromagnetic potential is of even parity.

Image of FIG. 14.
FIG. 14.

Dependence of the microtearing mode on collisionality. At low collisionality, a TEM dominates.

Image of FIG. 15.
FIG. 15.

Dependence of the low- mode on the ion temperature gradient. The dotted line separates the ion drift direction (upper half) from the electron drift direction (lower half).

Image of FIG. 16.
FIG. 16.

Growth rate and frequency spectra at . Negative frequencies are indicated by (−).

Image of FIG. 17.
FIG. 17.

Growth rate and frequency spectra at . Negative frequencies are indicated by (−).

Image of FIG. 18.
FIG. 18.

Growth rate and frequency for and variable (at ); the black line separates positive from negative frequencies. The asymmetry with respect to is only possible in flux surface geometries that are not up-down symmetric.

Image of FIG. 19.
FIG. 19.

Fluctuation amplitude of the electrostatic potential, mapped to the flux surface . The plot shows one mode with and .

Tables

Generic image for table
Generic image for table
Table I.

Plasma parameters for four specific flux surfaces of shot #20431.

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/content/aip/journal/pop/15/10/10.1063/1.3000132
2008-10-17
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Gyrokinetic microinstabilities in ASDEX Upgrade edge plasmas
http://aip.metastore.ingenta.com/content/aip/journal/pop/15/10/10.1063/1.3000132
10.1063/1.3000132
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