Reversal of the Parallel Drift Frequency in Anomalous Transport of Impurity Ions

Xu, Shaokang; Maeyama, S.; Watanabe, T.-H.; Gürcan, Ö. D.

doi:10.1103/physrevlett.132.105101

Phys. Rev. Lett.

2024

DOI: 10.1103/physrevlett.132.105101

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Reversal of the Parallel Drift Frequency in Anomalous Transport of Impurity Ions

Shaokang Xu,

S. Maeyama,

T.-H. Watanabe

et al.

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Estimation of turbulent transport coefficients by the conditional variance method

Tork,

Manz,

Bian

et al. 2024

Nucl. Fusion

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A novel approach for estimating turbulent transport coefficients in fusion devices is presented. The diagnostic method is established on the analysis of the conditional variance of one-point time series of density or temperature fluctuations. It is tested on data obtained from probe measurements in the edge of the tokamak ASDEX Upgrade and the stellarator Wendelstein 7-X, and on data from the gyrofluid transport model GEMR. The novel approach demonstrates a remarkable degree of accuracy, typically within a factor of two of the actual transport measured by more difficult means. In particular, the method is much more accurate than estimations based on correlation lengths and times. It is a simple and accurate way of evaluating turbulent transport coefficients in fusion devices that does not require measurements of the velocity fluctuations.

show abstract

Estimation of turbulent transport coefficients by the conditional variance method

Tork,

Manz,

Bian

et al. 2024

Nucl. Fusion

View full text Add to dashboard Cite

show abstract

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Reversal of the Parallel Drift Frequency in Anomalous Transport of Impurity Ions

Cited by 1 publication

References 25 publications

Estimation of turbulent transport coefficients by the conditional variance method

Estimation of turbulent transport coefficients by the conditional variance method

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