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research article

Application of Gaussian process regression to plasma turbulent transport model validation via integrated modelling

Ho, A.
•
Citrin, J.
•
Auriemma, F.
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May 1, 2019
Nuclear Fusion

This paper outlines an approach towards improved rigour in tokamak turbulence transport model validation within integrated modelling. Gaussian process regression (GPR) techniques were applied for profile fitting during the preparation of integrated modelling simulations allowing for rigourous sensitivity tests of prescribed initial and boundary conditions as both fit and derivative uncertainties are provided. This was demonstrated by a JETTO integrated modelling simulation of the JET ITER-like-wall H-mode baseline discharge #92436 with the QuaLiKiz quasilinear turbulent transport model, which is the subject of extrapolation towards a deuterium-tritium plasma. The simulation simultaneously evaluates the time evolution of heat, particle, and momentum fluxes over similar to 10 confinement times, with a simulation boundary condition at rho(tor) = 0.85. Routine inclusion of momentum transport prediction in multi-channel flux-driven transport modelling is not standard and is facilitated here by recent developments within the QuaLiKiz model. Excellent agreement was achieved between the fitted and simulated profiles for n(e), T-e, T-i, and Omega(tor) within 2 sigma, but the simulation underpredicts the mid-radius Ti and overpredicts the core n(e) and T-e profiles for this discharge. Despite this, it was shown that this approach is capable of deriving reasonable inputs, including derivative quantities, to tokamak models from experimental data. Furthermore, multiple figures-of-merit were defined to quantitatively assess the agreement of integrated modelling predictions to experimental data within the GPR profile fitting framework.

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Type
research article
DOI
10.1088/1741-4326/ab065a
Web of Science ID

WOS:000462112700004

Author(s)
Ho, A.
Citrin, J.
Auriemma, F.
Bourdelle, C.
Casson, F. J.
Kim, Hyun-Tae
Manas, P.
Szepesi, G.
Weisen, H.  
Date Issued

2019-05-01

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

59

Issue

5

Article Number

056007

Subjects

Physics, Fluids & Plasmas

•

Physics

•

tokamak

•

turbulence

•

model validation

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integrated modelling

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uncertainty quantification

•

gaussian processes

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
June 18, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/157797
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