Abstract
A detailed study has been performed to identify deleterious material radiation effects in unshielded highly-irradiated normal-conducting magnets. Application of the study to the design evolution of the normal-conducting hybrid coils in the MARS tandem mirror reactor resulted in the identification of several potential radiation-induced failure mechanisms and enabled coil lifetimes to be reasonably predicted. In the present optimized coil design, lifetime under a peak neutron wall loading of 4.5 MW m −2 is limited by swelling of the Spinel ceramic insulation to ∼ 1.5 full power years, The effect of radiation damage on high strength copper alloy conductors at these fluences ( 〉 10 ncm −2 ) remains an area of urgent data need.
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