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With the single frequency swept reflectometry diagnostic on ASDEX Upgrade radial correlation lengths of the plasma turbulence can be determined by a new quasi-simultaneous correlation technique. The scaling of the observed microturbulence is investigated in detail through the correlation lengths measured 2cm inside the separatrix. During the low-temperature L-mode and near the L-H transition these scale according to the resistive ballooning turbulence model. For L- and H-mode plasmas with higher temperatures the correlation length scale with the effective Larmour radius as expected for dominantly ni driven turbulence.

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Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, 42 (2000), 237-253
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