(a) Time-trace of the electron energy flux Qe defined in Eq. (5) , compared with (b) equivalent time-trace of the unsymmetrized electron exchange Se defined in Eq. (4) . The data are averaged over the spatial coordinates . The exchange exhibits significantly more intermittency than the energy flux.
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.
Comparison of the exchange computed with GYRO and TGLF, for both the GA standard case in (a) s-α circular geometry, and (b) a Miller circle.
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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