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The goal of this work is to assess potential runaway electron first wall impacts in the SPARC tokamak (Bt=12.2T, Ip=8.7MA), which is currently being built by Commonwealth Fusion Systems for demonstration of fusion gain Q>1. A simple analytical model is used to identify the operational plasma currents where runaway electrons could cause wall melting, and a threshold of around 1MA is where runaway impacts may start to cause concern, depending on the wetted area. Runaway electrons have been implemented into the simulation code HEAT[1] to calculate the trajectory, energy deposition, and resulting plasma facing component temperatures from runaway electron impacts. Preliminary simulation results are shown.
This work is supported in part by Commonwealth Fusion Systems.
Looby, T., Reinke, M., Wingen, A., Menard, J., Gerhardt, S., Gray, T., Donovan, D., Unterberg, E., Klabacha, J., & Messineo, M. (2022). A Software Package for Plasma-Facing Component Analysis and Design: The Heat Flux Engineering Analysis Toolkit (HEAT). Fusion Science and Technology, 78(1), 10–27. https://doi.org/10.1080/15361055.2021.1951532 ↩︎