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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2401.00051 |
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| _version_ | 1866913181497032704 |
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| author | Spangher, Lucas Arnold, William Spangher, Alexander Maris, Andrew Rea, Cristina |
| author_facet | Spangher, Lucas Arnold, William Spangher, Alexander Maris, Andrew Rea, Cristina |
| contents | The physical sciences require models tailored to specific nuances of different dynamics. In this work, we study outcome predictions in nuclear fusion tokamaks, where a major challenge are \textit{disruptions}, or the loss of plasma stability with damaging implications for the tokamak. Although disruptions are difficult to model using physical simulations, machine learning (ML) models have shown promise in predicting these phenomena. Here, we first study several variations on masked autoregressive transformers, achieving an average of 5\% increase in Area Under the Receiving Operating Characteristic metric above existing methods. We then compare transformer models to limited context neural networks in order to shed light on the ``memory'' of plasma effected by tokamaks controls. With these model comparisons, we argue for the persistence of a memory throughout the plasma \textit{in the context of tokamaks} that our model exploits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_00051 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Autoregressive Transformers for Disruption Prediction in Nuclear Fusion Plasmas Spangher, Lucas Arnold, William Spangher, Alexander Maris, Andrew Rea, Cristina Plasma Physics The physical sciences require models tailored to specific nuances of different dynamics. In this work, we study outcome predictions in nuclear fusion tokamaks, where a major challenge are \textit{disruptions}, or the loss of plasma stability with damaging implications for the tokamak. Although disruptions are difficult to model using physical simulations, machine learning (ML) models have shown promise in predicting these phenomena. Here, we first study several variations on masked autoregressive transformers, achieving an average of 5\% increase in Area Under the Receiving Operating Characteristic metric above existing methods. We then compare transformer models to limited context neural networks in order to shed light on the ``memory'' of plasma effected by tokamaks controls. With these model comparisons, we argue for the persistence of a memory throughout the plasma \textit{in the context of tokamaks} that our model exploits. |
| title | Autoregressive Transformers for Disruption Prediction in Nuclear Fusion Plasmas |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2401.00051 |