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Which mechanism causes luminosity increases from aging fusion reactors?

A)Increased D-T reaction cross-section
B)Core plasma density improvement
C)Reduced plasma impurity radiation
D)Growth in magnetic confinement fields

💡 Explanation

In a fusion reactor, helium ash gradually reduces plasma confinement, but improved fuel purity increases luminosity via enhanced fusion rates; this is because reduced Bremsstrahlung radiation increases reactivity, therefore luminosity rises, rather than decreases from fuel dilution.

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