We present experimental and numerical studies on a method to mitigate screening current-induced field (SCF) for no-insulation (NI) REBCO coil. The SCF is the major field error to incorporate a REBCO insert for a high-field low-temperature superconducting (LTS)/high-temperature superconducting (HTS) magnet. The field-shaking technique is going to be used to mitigate the SCF of 800-MHz REBCO insert magnet (H800) for MIT 1.3-GHz LTS/HTS nuclear magnetic resonance magnet (1.3 G). The field-shaking using 500-MHz LTS background magnet generates the SCF in H800, due to huge self and mutual inductances of them. In this paper, we tested the effect of the induced current in the NI REBCO coil on the field-shaking technique to mitigate the SCF. The amount of the induced current was decided by the NI REBCO coil status; the open- or closed-loop coil. We performed three cases of experimental tests and analyzed them. From the test results, we may conclude that we need to limit the ramp rate of L500 during the field-shaking, to minimize the induced current in the HTS insert which consists of the NI REBCO coil.

中文翻译：

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一种减轻非绝缘 REBCO 线圈屏蔽电流感应场的方法的实验和数值研究

我们提出了一种减轻非绝缘 (NI) REBCO 线圈屏蔽电流感应场 (SCF) 的方法的实验和数值研究。SCF 是为高场低温超导 (LTS)/高温超导 (HTS) 磁体加入 REBCO 插件的主要场误差。振动场技术将用于减轻 800-MHz REBCO 插入磁体 (H800) 的 SCF，用于 MIT 1.3-GHz LTS/HTS 核磁共振磁体 (1.3 G)。使用 500-MHz LTS 背景磁体的场抖动会在 H800 中产生 SCF，因为它们具有巨大的自感和互感。在本文中，我们测试了 NI REBCO 线圈中的感应电流对场抖动技术的影响，以减轻 SCF。感应电流的大小由 NI REBCO 线圈状态决定；开环或闭环线圈。我们进行了三个实验测试案例并对其进行了分析。根据测试结果，我们可以得出结论，我们需要限制 L500 在场抖动期间的斜坡速率，以最小化由 NI REBCO 线圈组成的 HTS 插入件中的感应电流。