This article discusses the influence of MgB₂ wire diameter on critical parameters, dominant pinning mechanism, and n value. Studies were conducted on multifilament MgB₂ wires of the 0.84 mm and 0.64 mm diameter. The wires were annealed under 1 GPa isostatic pressure, between 650 and 730 °C. Studies show that the best results (J_c, B_irr, n value, and point pinning mechanism) for a 0.64-mm wire were obtained with annealing temperature of 650 °C. However, the best results for wires with a 0.84-mm diameter were obtained with annealing temperature of 730 °C. This research was conducted for exploring the use of MgB₂ wires in multi-section superconducting coils, e.g., main coils generating magnetic fields and compensation coils—increasing the homogeneity of the magnetic field. Our research indicates that the main coil made with larger diameter wires should be heated at higher temperature (730 °C). In contrast, compensating coils with smaller diameter wires should be heated at a lower temperature (650 °C).

本文讨论了MgB ₂焊丝直径对关键参数，主导钉扎机制和n值的影响。对直径为0.84 mm和0.64 mm的MgB _2复丝进行了研究。导线在650至730°C的1 GPa等静压下退火。研究表明，在650°C的退火温度下，获得0.64 mm焊丝的最佳结果（J _c，B _irr，n值和点钉扎机制）。但是，在730°C的退火温度下，获得直径为0.84 mm的导线的最佳结果。进行这项研究是为了探索MgB ₂的用途多节超导线圈中的金属丝，例如产生磁场的主线圈和补偿线圈，提高了磁场的均匀性。我们的研究表明，用较大直径的线制成的主线圈应在更高的温度（730°C）下加热。相反，导线直径较小的补偿线圈应在较低温度（650°C）下加热。