We update here on the status of one of the main components of a 1.3 GHz NMR magnet currently being developed at the MIT Francis Bitter Magnet Laboratory (FBML): the 600 MHz HTS insert coil. Started in 2000 as a 3-phase program and currently in its final phase (Phase 3A), the HTS insert will first be installed in the bore of a 500 MHz all LTS magnet, generating a field of 25.8 T (1.1 GHz). In Phase 3B, we will place the HTS insert in the bore of a 700 MHz LTS magnet, achieving our ultimate goal of completing a high-resolution 1.3 GHz magnet. The HTS insert, built as a stack of double pancakes (DP), consists of two concentric stack of coils, the inner coil wound with YBCO tape and the outer coil with Bi2223/Ag tape. The series-connected coils, immersed in a bath of liquid helium at atmospheric pressure, will be operated in driven mode. The paper describes detailed aspects of: 1) design and fabrication of both coils, 2) testing of individual DPs at 77 K to characterize the current carrying capabilities and magnetic performance of each DP coil, 3) techniques and elements utilized in the DP-to-DP splice procedure and, 4) splice dissipation.

中文翻译：

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用于 1.3 GHz NMR 磁体的 600 MHz HTS 插件

我们在此更新麻省理工学院弗朗西斯苦磁实验室 (FBML) 目前正在开发的 1.3 GHz NMR 磁体的主要组件之一的状态：600 MHz HTS 插入线圈。HTS 插件于 2000 年开始作为一个三阶段项目，目前处于其最后阶段（阶段 3A），首先将安装在 500 MHz 全 LTS 磁体的孔中，产生 25.8 T (1.1 GHz) 的磁场。在第 3B 阶段，我们将 HTS 插入件放置在 700 MHz LTS 磁体的孔中，实现完成高分辨率 1.3 GHz 磁体的最终目标。HTS 插入物由双层薄饼 (DP) 堆叠构成，由两个同心的线圈堆叠组成，内线圈用 YBCO 胶带缠绕，外线圈用 Bi2223/Ag 胶带缠绕。串联的线圈浸入大气压的液氦浴中，将以驱动模式运行。