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← ScienceWhich challenge constrains sustained fusion within a tokamak reactor?
A)Plasma confinement instabilities develop quickly✓
B)Neutron activation severely weakens materials
C)High thermal gradients impede coolant flow
D)Cryogenic cooling requires excessive power
💡 Explanation
Plasma turbulence limits fusion yields because it triggers disruptive PLASMA INSTABILITIES that eject energy and particles from the confinement field. Therefore, controlling instabilities is key, rather than radiation damage or cryogenics, although both create challenges too.
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