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Turbulent energy exchange: Calculation and relevance for profile prediction
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Time-trace of the electron energy flux defined in Eq. (5) , compared with (b) equivalent time-trace of the unsymmetrized electron exchange defined in Eq. (4) . The data are averaged over the spatial coordinates . The exchange exhibits significantly more intermittency than the energy flux.

Image of FIG. 2.
FIG. 2.

Exchange calculation, comparing electron and ion exchange, using (a) original form of the moment integral, (b) symmetrized form of the moment integral. In (b), we see that the electron and ion contributions are almost exactly equal in magnitude as dictated by the theory.

Image of FIG. 3.
FIG. 3.

Comparison of the exchange computed with GYRO and TGLF, for both the GA standard case in (a) -α circular geometry, and (b) a Miller circle.

Image of FIG. 4.
FIG. 4.

Simulation of DIII-D shot 128913, comparing experimental profile (blue) with TGYRO-predicted profiles. Green curve shows prediction neglecting turbulent exchange. Red curve shows prediction including the turbulent exchange. Thus, for this discharge the exchange is essentially negligible.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Turbulent energy exchange: Calculation and relevance for profile prediction