Kinetic Equilibrium Prediction at TCV using RAPTOR and FBT
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Contré, C. E. Merle, A. Sauter, O. Van Mulders, S. Coosemans, R. Durr-Legoupil-Nicoud, G. Felici, F. Février, O. Heiss, C. Labit, B. Pau, A. Poels, Y. Venturini, C. Vincent, B. team, the TCV Team, the EUROfusion Tokamak Exploitation |
| author_facet | Contré, C. E. Merle, A. Sauter, O. Van Mulders, S. Coosemans, R. Durr-Legoupil-Nicoud, G. Felici, F. Février, O. Heiss, C. Labit, B. Pau, A. Poels, Y. Venturini, C. Vincent, B. team, the TCV Team, the EUROfusion Tokamak Exploitation |
| contents | We present results from a new Kinetic-Equilibrium Prediction (KEP) workflow and shot preparation for full TCV discharges, by coupling predict-first RAPTOR transport simulations with FBT inverse equilibrium calculations. RAPTOR is a 1.5D transport code which has been extensively used for plasma shot optimization and real-time modeling. We show that rapid pre-shot simulations can be performed directly using information from the pulse schedule across a wide range of plasma shapes and scenarios, given an estimate of the confinement quality factor H98(y,2) and line-averaged density. The resulting p' and TT' profiles are then provided to the pre-shot equilibrium computation performed by FBT - a static free-boundary solver routinely used at TCV - achieving convergence between the two codes in a few iterations. Finally, we show that this coupling, when integrated into the TCV shot preparation, improves the evaluation of the coil currents needed to match the target plasma shape; in particular providing an accurate estimate of critical quantities such as the internal inductance $l_i$ and normalized pressure $β_N$, giving more realistic information to tokamak operators about the expected pulse behavior and enabling them to adjust the plan correspondingly. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_01210 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Kinetic Equilibrium Prediction at TCV using RAPTOR and FBT Contré, C. E. Merle, A. Sauter, O. Van Mulders, S. Coosemans, R. Durr-Legoupil-Nicoud, G. Felici, F. Février, O. Heiss, C. Labit, B. Pau, A. Poels, Y. Venturini, C. Vincent, B. team, the TCV Team, the EUROfusion Tokamak Exploitation Plasma Physics We present results from a new Kinetic-Equilibrium Prediction (KEP) workflow and shot preparation for full TCV discharges, by coupling predict-first RAPTOR transport simulations with FBT inverse equilibrium calculations. RAPTOR is a 1.5D transport code which has been extensively used for plasma shot optimization and real-time modeling. We show that rapid pre-shot simulations can be performed directly using information from the pulse schedule across a wide range of plasma shapes and scenarios, given an estimate of the confinement quality factor H98(y,2) and line-averaged density. The resulting p' and TT' profiles are then provided to the pre-shot equilibrium computation performed by FBT - a static free-boundary solver routinely used at TCV - achieving convergence between the two codes in a few iterations. Finally, we show that this coupling, when integrated into the TCV shot preparation, improves the evaluation of the coil currents needed to match the target plasma shape; in particular providing an accurate estimate of critical quantities such as the internal inductance $l_i$ and normalized pressure $β_N$, giving more realistic information to tokamak operators about the expected pulse behavior and enabling them to adjust the plan correspondingly. |
| title | Kinetic Equilibrium Prediction at TCV using RAPTOR and FBT |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2603.01210 |