"New research highlights how energetic particles can stabilize plasma in fusion reactors, a key step toward clean, limitless energy. Credit: SciTechDaily.com" (ScitechDaily, Inside the Tokamak: Scientists Crack the Code to Stable Fusion Energy)
The new systems. Like magnetic field-controlled plasma brings fusion closer than before.
The answer could be that the system must make more ignition points to that reactor.
AI-based systems can control magnets and ignition systems more accurately.
Fusion tests are needed for that thing. The improved model of Tokamak is called ASDEX.
ASDEX Upgrade (Axially Symmetric Divertor Experiment) is a divertor tokamak at the Max-Planck-Institut für Plasmaphysik, Garching that went into operation in 1991. At present, it is Germany's second-largest fusion experiment after stellarator Wendelstein 7-X. (Wikipedia, ASDEX upgrade.)
"An edge-localized mode (ELM) is a plasma instability occurring in the edge region of a tokamak plasma due to periodic relaxations of the edge transport barrier in high-confinement mode. Each ELM burst is associated with expulsion of particles and energy from the confined plasma into the scrape-off layer. This phenomenon was first observed in the ASDEX tokamak in 1981. Diamagnetic effects in the model equations expand the size of the parameter space in which solutions of repeated sawteeth can be recovered compared to a resistive MHD model. An ELM can expel up to 20 percent of the reactor's energy" ( Wikipedia, Edge-localized mode)
The problem with the plasma in the fusion reactor is its very high temperature. In that material, even small effects can cause very big effects. If the plasma ring turns asymmetrical the system cannot form fusion. The plasma hovers in a magnetic field that denies contact with the wall of the torus. The most effective way to make the fusion is to use ion and anion plasma.
Those plasma rings would pull each other together. And the laser can ignite the fusion. The problem is that those anions and ions must not touch each other before the temperature is high enough for fusion. Another problem is the point where fusion ignition starts. There must be enough ignition points. The energy impulse in the plasma ring causes ignition. That ignition sends an energy wave to plasma and destroys that plasma ring.
Tokamak is one of the most common and advanced fusion reactor test beds. Another thing that can be promising is the system. That uses two linear particle accelerators to shoot ions and anions against each other. That model is the same way easy to use as Tokamak. In that linear model, the particle accelerators shoot ions and anions into a laser ray. And that causes ignition between those linear accelerators. In that model adding more fuel to the reactor is easier than in tokamak.
https://www.iter.org
https://scitechdaily.com/inside-the-tokamak-scientists-crack-the-code-to-stable-fusion-energy/
https://en.wikipedia.org/wiki/ASDEX_Upgrade
https://en.wikipedia.org/wiki/Divertor
https://en.wikipedia.org/wiki/Edge-localized_mode
https://en.wikipedia.org/wiki/Stellarator
https://en.wikipedia.org/wiki/Wendelstein_7-X