Accurate measurements of the emitted radiation are crucial for controlling a fusion reactor. In addition to affecting the global power balances, high levels of local radiation emission can indicate that the plasma is losing stability and can disrupt. Several radiation events can occur in a tokamak differing in localization, shape, and dimension. Each of these can be originated by various causes and degrade the plasma confinement in different ways. On current tokamaks, radiation is measured by bolometers, but these provide only line integrated values. For this reason, quite sophisticated tomography inversion algorithms are required to obtain local information, but this approach is slow and cannot be used in real time yet. A fast inversion method, which provides local information with high temporal resolution, has been developed. This allows to reconstruct the emissivity in all the relevant regions of the plasma and so to recognize different anomalous radiation events. In this work, an analysis of the fast inversion method and of its performances is presented using synthetic data. The reliability of the method is tested by simulating different patterns of radiation. Then the accuracy is evaluated by analysing the impact of different features, such as shape and position, on the reconstruction.
Wyss, I., Murari, A., Peluso, E., Gelfusa, M., Gaudio, P., Rossi, R. (2024). On the accuracy of a fast time resolution inversion method for the detection of different radiation patterns in fusion reactors. FUSION ENGINEERING AND DESIGN, 205 [10.1016/j.fusengdes.2024.114527].
On the accuracy of a fast time resolution inversion method for the detection of different radiation patterns in fusion reactors
Wyss, Ivan
;Peluso, Emmanuele;Gelfusa, Michela;Gaudio, Pasquale;Rossi, Riccardo
2024-01-01
Abstract
Accurate measurements of the emitted radiation are crucial for controlling a fusion reactor. In addition to affecting the global power balances, high levels of local radiation emission can indicate that the plasma is losing stability and can disrupt. Several radiation events can occur in a tokamak differing in localization, shape, and dimension. Each of these can be originated by various causes and degrade the plasma confinement in different ways. On current tokamaks, radiation is measured by bolometers, but these provide only line integrated values. For this reason, quite sophisticated tomography inversion algorithms are required to obtain local information, but this approach is slow and cannot be used in real time yet. A fast inversion method, which provides local information with high temporal resolution, has been developed. This allows to reconstruct the emissivity in all the relevant regions of the plasma and so to recognize different anomalous radiation events. In this work, an analysis of the fast inversion method and of its performances is presented using synthetic data. The reliability of the method is tested by simulating different patterns of radiation. Then the accuracy is evaluated by analysing the impact of different features, such as shape and position, on the reconstruction.File | Dimensione | Formato | |
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