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← ScienceWhich outcome occurs when a tokamak reaches its density limit?
A)Plasma current collapses abruptly (disruption)✓
B)Fusion reactions become magnetically self-sustaining
C)Helium ash accumulates on the divertor
D)Tritium breeding exceeds fuel consumption
💡 Explanation
When the density limit is reached, radiative losses increase because increased electron collision rate enhances Bremsstrahlung radiation. The resulting thermal instability leads to plasma current disruption, therefore, rather than sustained fusion, quenching reactions.
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