Better cryo-stability is mandatory for any superconducting (SC) feeders system of fusion devices as the large amount of the magnet-stored energy can be safely dumped via feeder path only. Magnesium diboride (MgB ₂ ) as a feeder may provide an innovative solution in lieu of low temperature superconductor. It has a critical SC transition temperature ( T_C ) of 39 K, ductile nature, and ease of availability at a relatively lower cost. SST-1 Tokamak at IPR India utilizes NbTi/Cu based cable-in-conduit conductors for its SC feeders rated at 10 kA and designed to be cooled using forced-flow helium at 4.5 K, 0.4 MPa. In order to assess the suitability of MgB ₂ as a feeder, we report a thermo-hydraulic study of 10 kA rated SC feeders for SST-1. The results show that MgB ₂ SC feeders can provide benefits of higher temperature margin at a lower mass flow rate with reduced pressure drop and the cryo-plant capacity savings in comparison to existing NbTi-based feeders.

中文翻译：

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用于SST-1托卡马克的MgB ₂超导进料器的热工水力研究

任何聚变设备的超导（SC）馈线系统都必须具有更好的低温稳定性，因为只能通过馈线路径安全地倾倒大量的磁体存储能量。二硼化镁（MgB ₂ ）可以代替低温超导体提供创新的解决方案。它具有临界的SC转变温度（ Ť _ç ）（39 K），易延展的特性以及易于使用，且成本相对较低。印度IPR的SST-1 Tokamak将NbTi / Cu基电缆导管导体用于其额定电流为10 kA的SC馈线，并设计为使用4.5 K，0.4 MPa的强制流动氦气进行冷却。为了评估MgB ₂作为馈线的适用性 ，我们报告了对SST-1进行10 kA额定SC馈线的热工液压研究。结果表明，与现有的基于NbTi的喂料器相比，MgB ₂ SC喂料器可在较低的质量流量下提供更高的温度裕度，并具有降低的压降和节省冷冻设备的能力。