Current, Carrying Capacity and Transition State of Superconducting Solenoids
Solenoids wound with high-field superconducting wire (e.g., NbZr) display maximum currents I m and maximum fields H m , which are generally considerably less than the critical current I c of a short piece of the same wire exposed to a homogeneous transverse field of equal strength H m . This phenomenon is known as the degradation effect p], Montgomery  and Chandrasekhar and Hulm . suggested models for predicting I m and H m of high-field superconducting solenoids. Both models consider a linear relation between the field H and the coil current I (load line) which is assumed to be identical with that of a nonsuperconducting solenoid with the same dimensions
KeywordsCritical Current Critical Field Lead Wire Degradation Effect Insulation Thickness
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