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Sixth element (Z=6) in the periodic table, has 6 protons, often described as the basis of life on land because of its chemical properties, has potential for use with silicon as a low-activation structural material for fusion reactors, in the formsilicon carbide.
Carbon tiles are often used in plasma-facing components because its low Z makes carbon a relatively glorious impurity. It is also useful as a neutron moderator.
See: low-activation materials, plasma-facing components.