Platform development for fusion energy - phase 4

Important results from the project

We have developed MirinPlusNova, a time-dependent 1.5D model that describes plasma confinement in Novatron´s unique magnetic field configuration with a magnetic cusp in the central cell. The model simulates the start-up of the next experiment, N2, until a stable equilibrium with good confinement times. As a complement, we have built the 2D equilibrium solver Aneq and an independent theoretical 0D cusp model for validation. Together, the tools provide a quantitative basis for the design of N2.

Expected long term effects

The tools allow us to evaluate and optimize the N2 and reactor concepts we develop, thereby locking in the N2 design. The concept choice can also be reported to external reviewers in a scientific and transparent manner. By simulating different start-up scenarios, we can both plan the purchase of the components required to create the desired plasma and develop an experimental plan for N2, where we identify stable intermediate steps on the way to the target parameters.

Approach and implementation

We identified early on the need for a time-dependent model to study start-up phases, e.g. the build-up of the electrostatic potential. Mirin´s model was difficult to converge, but with AI-support we were able to reproduce the basic results and then add the cusp model, inspired by RFC-XX. Stiff equations were solved with a CFD-inspired Patankar solver. In parallel, we developed a closed-form 0D model for confinement times with both electrostatic and ponderomotive plugging.