Automatic JOREK calibration via batch Bayesian optimization
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Published version
Author(s)
Crovini, E
Pamela, SJP
Duncan, AB
Type
Journal Article
Abstract
Aligning pedestal models and associated magnetohydrodynamic codes with experimental data is an important challenge in order to be able to generate predictions for future devices, e.g., ITER. Previous efforts to perform calibration of unknown model parameters have largely been a manual process. In this paper, we construct a framework for the automatic calibration of JOREK. More formally, we reformulate the calibration problem into a black-box optimization task, by defining a measure of the discrepancy between an experiment and a reference quantity. As this discrepancy relies on JOREK simulations, the objective becomes computationally intensive and, hence, we resort to batch Bayesian optimization methodology to allow for efficient, gradient-free optimization. We apply this methodology to two different test cases with different discrepancies and show that the calibration is achievable.
Date Issued
2024-06
Date Acceptance
2024-05-16
Citation
Physics of Plasmas, 2024, 31 (6)
ISSN
1070-664X
Publisher
American Institute of Physics
Journal / Book Title
Physics of Plasmas
Volume
31
Issue
6
Copyright Statement
© 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
License URL
Identifier
https://pubs.aip.org/aip/pop/article/31/6/063901/3296934/Automatic-JOREK-calibration-via-batch-Bayesian
Subjects
CONFINEMENT
EDGE
MAGNETOHYDRODYNAMICS
Physical Sciences
Physics
Physics, Fluids & Plasmas
Science & Technology
SIMULATION
STABILITY
Publication Status
Published
Article Number
063901
Date Publish Online
2024-06-07