Project description
Machine learning for robust models in plasma physics
Complex kinetic models described by the Vlasov equation are simplified in plasma physics through the closure process to arrive at magneto-fluid models. While these simplified models require less computational power, they have limitations in applications where particle collisions are infrequent. With the support of the Marie Skłodowska-Curie Actions programme, the STRIDE project will use machine learning to create models with fewer degrees of freedom to describe kinetic processes for Geospace Environmental Modelling (GEM), such as magnetic reconnection. It will use deep neural networks and equation discovery to correct fluid-type models, which will be tested in numerical simulations. The project will address challenges related to model robustness, uncertainty quantification, and extreme event generation. Trained models will be made open-source to support further research.
Objective
Plasma physics has seen a long tradition of deriving simplified models such as magnetohydrodynamics through a process known as closure: starting from computationally demanding kinetics and following various analytical approximate schemes resulting in fluid-type models which are less accurate but more tractable. Due to smaller computational footprint these models have found applications in space weather modelling and fusion. The problem is that in many interesting applications, e.g. where collisions between particles are rare, the analytic closures have limitations.
The goal of STRIDE (Systematic Techniques for Robust Inference and Data-driven Explainable closures for plasma) is to use machine learning to construct models with fewer degrees of freedom that describe kinetic processes relevant for Geospace Environmental Modelling (GEM), such as magnetic reconnection. Corrections to fluid-type models will be learned with deep neural networks and equation discovery and tested in numerical simulations. The important challenge involves understanding how such surrogates can be made robust against out-of-distribution shifts (i.e. different physical conditions) and numerical instabilities. Thus the closures will be first trained on data generated by high fidelity physics-based model, e.g. kinetic Particle-in-Cell simulations, for a specific set of parameters and then transfer learning will be applied to a different set of parameters to improve robustness. Uncertainty quantification and the ability to generate extremes will be investigated.
The scientific question to be addressed here include: how can we interpret the trained models using explainable AI, what are the optimal ways of performing transfer learning and fine-tuning on the observational data, are there physical considerations (such as conservation laws or symmetries) that can reduce the costs associated with training such machine learning models? Trained models will be made open-source to foster research.
Fields of science (EuroSciVoc)
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CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA)
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Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships
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Call for proposal
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(opens in new window) HORIZON-MSCA-2023-PF-01
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3000 Leuven
Belgium
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