Resin-impregnated high-field Nb₃Sn type of accelerator magnets are known to require extensive training campaigns and even may exhibit performance-limiting defects after thermal or electromagnetic cycling. In order to efficiently explore technological solutions for this behaviour and assess a wide variety of impregnation material combinations and surface treatments, the BOnding eXperiment (BOX) sample was developed. BOX provides a short-sample test platform featuring magnet-relevant Lorentz forces and exhibits associated training. Here we report on the comparative behaviour of BOX samples comprising the same Nb₃Sn Rutherford cable but impregnated either with common resins used in high-field magnets, or with less conventional paraffin wax. Remarkably, the two paraffin wax-impregnated BOX samples reached their critical current without training and are also resilient to thermal and mechanical cycling. These rather encouraging results strongly contrast to those obtained with resin impregnated samples, which show the characteristic extensive training and at best barely reach their critical current value.

中文翻译：

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在 BOX 样品中展示的改进石蜡浸渍 Nb3Sn 卢瑟福电缆的训练

众所周知，树脂浸渍的高场 Nb ₃ Sn 型加速器磁体需要大量训练，甚至在热循环或电磁循环后可能会出现性能限制缺陷。为了有效地探索这种行为的技术解决方案并评估各种浸渍材料组合和表面处理，开发了 BOnding eXperiment (BOX) 样品。BOX 提供了一个小样本测试平台，具有与磁铁相关的洛伦兹力并展示相关培训。在这里，我们报告了包含相同 Nb _{3的 BOX 样品的比较行为}Sn Rutherford 电缆，但浸渍了高场磁铁中使用的普通树脂，或浸渍了较少的常规石蜡。值得注意的是，两个石蜡浸渍的 BOX 样品无需训练即可达到其临界电流，并且对热循环和机械循环也有弹性。这些相当令人鼓舞的结果与用树脂浸渍样品获得的结果形成鲜明对比，树脂浸渍样品显示出广泛训练的特征，最多勉强达到其临界电流值。