A compact superconducting magnet was constructed for low-energy nuclear physics experiments at the RAON heavy-ion accelerator facility. Conduction-cooled Helmholtz coils with a radius of 40 cm generate a uniform magnetic field of up to 1.51 T at a current of 71 A. The magnet has two crossing beam windows that allows the beam to pass either parallel (solenoid mode) or perpendicular (dipole mode) to the field direction. The magnet operates at a ramping rate of 0.01 A/s without quenching and generates a highly uniform magnetic induction within 0.1% of the central value of 1.51 T over the volume of $10\times 10\times 10$ cm$^3$ corresponding to the size of an active target time projection chamber. Herein, we report our first excitation test and field mapping results.

中文翻译：

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用于 RAON 有源目标 TPC 实验的传导冷却超导磁铁

在 RAON 重离子加速器设施中，为低能核物理实验建造了一个紧凑的超导磁体。半径为 40 cm 的传导冷却亥姆霍兹线圈在 71 A 的电流下产生高达 1.51 T 的均匀磁场。磁铁有两个交叉的光束窗口，允许光束平行（电磁模式）或垂直（偶极子模式）到场方向。磁铁以 0.01 A/s 的斜率运行而不会淬火，并在 1.51 T 的中心值的 0.1% 范围内产生高度均匀的磁感应。$10\乘以 10\乘以 10$ 厘米$^3$对应于活动目标时间投射室的大小。在这里，我们报告了我们的第一次激发测试和场映射结果。