What gain means here
Gain shows simulated fusion output compared with simplified heating input. Real projects define gain at different boundaries, so always check what is being measured.
Working 3D simulation
Change reactor controls and watch the plasma respond
This is an educational model, not a reactor design tool. It helps learners see why fuel choice, temperature, density, and magnetic confinement must improve together.
Why stress rises
Higher temperature, density, and fields improve burn conditions but increase loads on magnets, first wall, blankets, and heat removal systems.
Why fuels differ
D-T is easier to burn but neutron-heavy. Advanced fuels reduce some activation questions while increasing plasma difficulty.