REBa2Cu3O7-δ (REBCO, RE: rare earth) coated conductors (CCs) can generate a powerful magnetic field and are optimal for sustaining the reaction in fusion devices. However, the REBCO CCs will inevitably be exposed to neutron radiation during device operation. Transmutation produces gas atoms such as hydrogen will affect their properties. In this paper, GdBCO CCs were irradiated by 20 eV deuterium plasma. It was found that the irradiation introduced smaller (2–4 nm) pinning sites that formed a mixed pinning landscape with rare earth oxides (tens of nanometres) in the pristine samples, leading to an improved vortex pinning. At an irradiation fluence of 5.0 × 1018 D cm−2, the Jc values of the samples irradiated by deuterium can maintain the best enhancement of in-field performance at 4.2 K. Excess irradiation results in a decrease in Jc, a broadening of the superconducting transition width, and an enhanced disorder in GdBCO. This study provides some valuable insights for potential changes in the properties of REBCO CCs irradiated in fusion devices.

中文翻译：

---

解锁经氘等离子体辐照的 GdBCO 涂层导体的性能演变

REBa2Cu3O7-δ（REBCO，RE：稀土）涂层导体（CC）可以产生强大的磁场，是维持聚变装置中反应的最佳选择。然而，REBCO CC 在设备运行期间将不可避免地暴露于中子辐射。嬗变产生的气体原子如氢会影响它们的性质。在本文中，GdBCO CCs受到20 eV氘等离子体的照射。研究发现，辐照引入了更小的（2-4 nm）钉扎位点，与原始样品中的稀土氧化物（数十纳米）形成了混合钉扎景观，从而改善了涡流钉扎。在辐照注量为5.0 × 1018 D cm−2时，氘辐照样品的Jc值在4.2 K时可以保持场内性能的最佳增强。过量辐照导致Jc降低，超导范围展宽。过渡宽度和 GdBCO 的无序性增强。这项研究为聚变装置中辐照的 REBCO CC 特性的潜在变化提供了一些有价值的见解。