TJ-II stellarator scientific scale mock-up

This prototype is a scientific 1:1 scale mock-up of the TJ-II stellarator, located at the National Fusion Laboratory of CIEMAT in Madrid (Spain). The TJ-II is a medium-sized, flexible magnetic confinement fusion device. Its scientific research focuses on understanding plasma behavior in different magnetic configurations, providing key insights for the design and optimization of next-generation stellarators. TJ-II has been highly scientifically productive in the following areas: the study of plasma confinement, stability, and transport in the stellarator concept, the investigation of turbulence and neoclassical transport, as well as in advanced diagnostics and plasma control techniques.

The mock-up accurately represents the three-dimensional arrangement of the magnetic field coils and the plasma vessel, which highlights the non-axisymmetric magnetic geometry used to confine high-temperature plasma without the need for large plasma currents. It provides a clear physical visualization of magnetic surfaces, port views, and plasma shaping in stellarators.