中子辐照（RE）BCO涂层导体临界电流的应力依赖性
Stress dependence of the critical currents in neutron irradiated (RE)BCO coated conductors
摘要：
高温超导涂层导体在未来聚变或加速器磁体中的应用目前越来越受到关注。高的洛伦兹力和因此高的环向应力作用在大线圈中的导体上。此外，导体在聚变或加速器磁体中暴露于中子辐射。预期的中子注量超过所需的寿命，这种磁铁可以模拟裂变反应堆中的辐照实验。涂层导体的特点是在原始状态和照射后的ITER设计通量。在液氮中测量了临界电流对外加应力的灵敏度。该装置的冷部分位于可旋转的分裂线圈电磁体之间，用于在最大洛伦兹力配置下评估高达1.4T的Ic各向异性。辐照后，GdBCO/IBAD导体对外加应力的IC敏感性发生了显著变化，而YBCO/RABiTS导体几乎没有变化。此外，Ic和Tc强烈减少在GdBCO/IBAD样品照射后。的角度依赖性的Ic改变两个样品在不同的方式照射后，但没有变化的角度依赖性时，观察到施加应力。Gd的高中子俘获截面和由此产生的Tc的强烈降低似乎是负责不同的应力依赖性的Ic在辐照Gd-123涂层导体。
英文摘要：
The application of HTS coated conductors in future fusion or accelerator magnets is currently of increasing interest. High Lorentz forces and therefore high hoop stresses act on the conductors in large coils. The conductor is furthermore exposed to neutron radiation in fusion or accelerator magnets. The expected neutron fluence over the desired lifetime of such magnets can be simulated by irradiation experiments in a fission reactor. The coated conductors were characterized in the pristine state and after irradiation to the ITER design fluence. The sensitivity of the critical currents to applied stress was measured in liquid nitrogen. The cold part of the set-up was positioned between a rotatable split coil electro-magnet for assessing the Ic-anisotropy up to 1.4T under maximum Lorentz force configuration. The Ic-sensitivity to applied stress changed significantly in the GdBCO/IBADconductors after irradiation, whereas nearly no change was observed in the YBCO/RABiTS-conductor. Furthermore, Ic and Tc were strongly reduced in the GdBCO/IBAD-sample after irradiation. The angular dependence of Ic changed for both samples in different ways after the irradiation, but no change in the angular dependence was observed upon applying stress. The high neutron capture cross-section of Gd and the resulting strong reduction of Tc seem to be responsible for the different stress dependence of Ic in irradiated Gd-123 coated conductors.
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