高场磁体HTS插入式线圈中AC损耗的数值计算
Numerical evaluation of AC losses in an HTS insert coil for high field magnet during its energization
摘要：
采用平板近似，数值计算了25 T无致冷剂超导磁体高温超导插入线圈在超导过程中的交流损耗。高温超导插入线圈由68个单个薄煎饼组成，缠绕有涂层导体，产生11.5 T的中心磁场，此外还有一组低温超导（LTS）外插线圈的14.0 T的贡献。HTS和LTS线圈都使用低温冷却器冷却，并同时通电至25.5 T，以恒定的斜坡率持续60 min。在交流损耗计算中考虑了局部施加的磁场的大小和方向、匝间磁相互作用以及绕组中流动的运输电流的影响。局部施加的场被分成轴向和径向分量，并且这些场分量对AC损耗的单独贡献被简单地求和以获得总损耗。轴向场分量对总交流损耗的贡献在振荡的早期阶段较大，而在径向场分量的贡献变得足够大之后，总损耗随时间单调增加。
英文摘要：
AC losses in a high temperature superconducting (HTS) insert coil for a 25-T cryogen-free superconducting magnet are numerically calculated during its energization, assuming slab approximation. The HTS insert coil consists of 68 single pancakes wound with coated conductors and generating a central magnetic field of 11.5 T, in addition to a contribution of 14.0 T from a set of low temperature superconducting (LTS) outsert coils. Both the HTS and LTS coils are cooled using cryocoolers, and energized simultaneously up to 25.5 T with a constant ramp rate for 60 min. The influences of the magnitudes and orientations of the locally applied magnetic fields, magnetic interactions between turns, and the transport currents flowing in the windings are taken into account in the AC loss calculations. The locally applied fields are separated into axial and radial components, and the individual contributions of these field components to the AC losses are summed simply to obtain the total losses. The contribution of the axial field component to the total AC loss is large at the early stages of the energization, whereas the total losses monotonically increase with time after the contribution of the radial field component becomes sufficiently large.
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