Development of non-circular REBCO pancake coil for high-temperature superconducting cyclotron
Development of non-circular REBCO pancake coil for high-temperature superconducting cyclotron
复制标题
高温超导回旋加速器用非圆形REBCO薄饼线圈的研制
DOI：
10.1109/tasc.2014.2365626
复制
发表时间：
2015
影响因子：
1.8
通讯作者：
Shigeo Nagaya
中科院分区：
文献类型：
--
作者：
Xudong Wang;Hirotaka Umeda;Atsushi Ishiyama;Masaki Tashiro;Hiroshi Yamakawa;Hiroshi Ueda;Tomonori Watanabe;Shigeo Nagaya
针对高温超导（HTS）磁体系统应用于粒子癌症治疗的重离子加速器进行了一系列可行性研究。新型高温超导回旋加速器预计将比传统的重离子同步加速器更紧凑、效率更高。 HTS磁体需要高电流密度才能实现紧凑的HTS回旋加速器。此外，由于高电流密度会产生很大的洛伦兹力，高强度的加固结构对于高温超导磁体来说是绝对必要的，以防止磁体变形并维持所需的高精度磁场。在之前的研究中，提出了一种称为 Y 基氧化物超导体和增强外部集成“YOROI 线圈”的新型线圈结构，并在 8-T 备份场中在 4.2 K 下进行了测试。 YOROI模型线圈在由磁场、电流密度和线圈半径的乘积确定的最大环向应力为1.7 GPa的励磁测试后没有表现出退化。对 YOROI 线圈的线圈绕组和增强结构之间的应力分配机制进行了数值确定。此外，在之前的论文中，还对基于 YOROI 线圈的圆形 REBCO 线圈的增强结构的电磁和机械性能进行了数值模拟，该增强结构假设是 HTS 回旋加速器磁体系统的一部分。在本研究中，假设 HTS 回旋加速器磁体系统的一部分，针对非圆形 REBCO 线圈，在 YOROI 线圈的基础上提出了一种新的增强结构。新加固结构的电磁和机械性能是通过数值确定的。因此，所提出的加固结构具有很大的能力来减少作用在线圈绕组上的应力和应变，以保持线圈形状并防止REBCO线的退化。
A series of feasibility studies are carried out on the applications of a high-temperature superconducting (HTS) magnet system to a heavy-ion accelerator for particle cancer therapy. A novel HTS cyclotron is expected to be more compact and have higher efficiency than a conventional heavy ion synchrotron accelerator. A high current density is required for the HTS magnet to realize a compact HTS cyclotron. Further, a high-strength reinforcing structure is absolutely essential for the HTS magnet owing to the large Lorentz force caused by the high current density to prevent the magnet deformation and maintain the required high accuracy field. In a previous study, a novel coil structure called the Y-based oxide superconductor and reinforcing outer integrated “YOROI coil” was proposed and tested at 4.2 K in 8-T backup fields. The YOROI model coil exhibited no degradation after the excitation test with a maximum hoop stress of 1.7 GPa determined by the product of the magnetic field, current density, and coil radius. The mechanism of stress sharing between the coil winding and the reinforcing structures of the YOROI coil was numerically determined. In addition, the electromagnetic and mechanical properties of a reinforcing structure based on the YOROI coil for circular REBCO coils assuming part of the HTS cyclotron magnet system was also numerically simulated in the previous paper. In this study, a new reinforcing structure is proposed on the basis of the YOROI coil for a non-circular REBCO coil assuming part of the HTS cyclotron magnet system. The electromagnetic and mechanical properties for the new reinforcing structure are numerically determined. As a result, the proposed reinforcing structure has great ability to reduce the stress and strain acting on the coil winding to maintain the coil shape and prevent degradation in the REBCO wire.