Development of Combined-Function Multipole Permanent Magnet for High-Intensity Beam Transportation
Development of Combined-Function Multipole Permanent Magnet for High-Intensity Beam Transportation
复制标题
用于高强度光束传输的组合功能多极永磁体的开发
DOI：
10.1109/tasc.2022.3176251
复制
发表时间：
2022
影响因子：
1.8
通讯作者：
Iwashita Y.
中科院分区：
文献类型：
--
作者：
Fuwa Y.;Takayanagi T.;Iwashita Y.
利用高阶多极磁场分量的空间电荷补偿技术已被提出用于传输高强度带电粒子束。为了在有限的束线空间内实现这种补偿技术，我们设计了一种体积紧凑的组合功能多极永磁体。这种磁体可以在束线上的同一位置产生两个多极组件。作为第一步，我们设计了一种磁体，利用永磁体材料同时产生固定强度的四极和可调强度的八极组件。在这个磁铁模型中，磁路由两组磁铁组成。第一组是一组梯形磁体，占据了大部分空间，产生一个幅值为30T/m的四极磁场分量；第二组是内层圆柱形磁体，产生幅值为17000T/m~3的八极磁体。通过旋转这些圆柱形磁铁，八极分量的强度可以从17,000 T/m~3到0 T/m~3变化。该设计被用来构建一个原型模型。在该模型中，实现了调制机制，以验证八极磁场强度调制方案的可行性。
Space charge compensation technology using higher-order multipole magnetic field components has been proposed to transport high-intensity charged particle beams. In order to realize this compensation technology in a limited beam line space, we devised a compact-size combined-function multipole permanent magnet. This magnet can produce two multipole components at the same location on the beam line. As a first step, we have designed a magnet to simultaneously generate a fixed-strength quadrupole and an adjustable-strength octupole component using permanent magnet materials. In this magnet model, the magnetic circuit consists of two groups of magnets. The first one is a group of trapezoidal magnets that occupy most of the space to generate a quadrupole magnetic field component with a magnitude of 30 T/m. The second one is an inner group of cylindrical magnets to generate an octupole component with a magnitude up to 17,000 T/m3. The intensity of the octupole component can be varied from 17,000 T/m3to 0 T/m3by rotating these cylindrical magnets. This design was used to build a prototype model. In this model, the modulation mechanism was implemented to verify the feasibility of the modulation scheme for the octupole magnetic field strength.