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Table 2 Design parameters of a pair of HTS current leads

From: Conceptual design of the superconducting magnet for the 250 MeV proton cyclotron

Material HTS OFHC copper
Maximum operating current (A) 250 250
Ground insulation (V) 500 500
HTS 4 × Bi-2223/Ag–Au
Joint resistance between HTS and NbTi/Cu (μΩ) <0.2 <1
Operating temperature (K) 5~60 60~300
Heat load (W) <0.3 @4.2 K <25 @60 K