Probing plasma turbulence by modulating the electron temperature gradient
- DeBoo, J. C.
- Holland, C.
- Rhodes, T. L.
- Schmitz, L.
- Wang, G.
- White, Anne E.
- Austin, M. E.
- Doyle, E. J.
- Hillesheim, J. C.
- Peebles, W. A.
- Petty, C. C.
- Yan, Z.
- Zeng, L.
DOIAbstract
The local value of a/L[subscript Te], a turbulence drive term, was modulated with electron cyclotron heating in L-mode discharges on DIII-D [ J. L. Luxon, Nucl. Fusion 42, 614 (2002) ] and the density and electron temperature fluctuations in low, intermediate, and high-k regimes were measured and compared with nonlinear gyrokinetic turbulence simulations using the GYRO code [ J. Candy and R. E. Waltz, J. Comput. Phys. 186, 545 (2003) ]. The local drive term at ρ ∼ 0.6 was reduced by up to 50%, which produced comparable reductions in electron temperature fluctuations at low-k. At intermediate k, ktheta ∼ 4 cm[superscript −1] and kthetaρs ∼ 0.8, a very interesting and unexpected result was observed where density fluctuations increased by up t...
Add to ORKG