https://www.energy.gov/science/doe-explainsstellarators https://www.energy.gov/science/doe-explainsstellarators A stellarator is a machine that uses magnetic f

https://www.energy.gov/science/doe-explainsstellarators https://www.energy.gov/science/doe-explainsstellarators A stellarator is a machine that uses magnetic fields to confine plasma in the shape of a donut, called a torus. Over tokamaks, the other main technology that scientists are exploring for fusion power, stellarators require less injected power to sustain the plasma, have greater design flexibility, and allow for simplification of some aspects of plasma control. However, these benefits come at the cost of increased complexity, especially for the magnetic field coils.