Validation metrics for turbulent plasma transport

Holland, C.

doi:10.1063/1.4954151

Title: Validation metrics for turbulent plasma transport

Journal Article · 22 June 2016 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.4954151 · OSTI ID:1259193

Holland, C. ^[1]

Univ. of California San Diego, La Jolla, CA (United States)

Developing accurate models of plasma dynamics is essential for confident predictive modeling of current and future fusion devices. In modern computer science and engineering, formal verification and validation processes are used to assess model accuracy and establish confidence in the predictive capabilities of a given model. This paper provides an overview of the key guiding principles and best practices for the development of validation metrics, illustrated using examples from investigations of turbulent transport in magnetically confined plasmas. Particular emphasis is given to the importance of uncertainty quantification and its inclusion within the metrics, and the need for utilizing synthetic diagnostics to enable quantitatively meaningful comparisons between simulation and experiment. As a starting point, the structure of commonly used global transport model metrics and their limitations is reviewed. An alternate approach is then presented, which focuses upon comparisons of predicted local fluxes, fluctuations, and equilibrium gradients against observation. Furthermore, the utility of metrics based upon these comparisons is demonstrated by applying them to gyrokinetic predictions of turbulent transport in a variety of discharges performed on the DIII-D tokamak, as part of a multi-year transport model validation activity.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-06ER54871; SC0006957

OSTI ID:: 1259193

Alternate ID(s):: OSTI ID: 1420654; OSTI ID: 1434473

Journal Information:: Physics of Plasmas, Vol. 23, Issue 6; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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Title: Validation metrics for turbulent plasma transport

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