CAT-1超导磁悬浮系统的平衡分析与永磁实验装置设计

Balance analysis of CAT-1 superconducting maglev system and design of permanent magnet experimental device

天环一号(CAT-1)是国内首个采用磁悬浮偶极场磁体设计的磁约束等离子体装置。本文根据CAT-1装置总体目标和参数设计要求,采用线电流简化模型,基于矢量磁场、力学平衡及动力学等方法,完成了超导磁悬浮系统的平衡稳定分析,给出了参数设计结果;初步设计出简化的永磁悬浮实验装置,用于检验超导磁悬浮系统稳定性及参数可靠性。结果表明:对于CAT-1装置的悬浮磁体1200 kg、电流5 MA、悬浮距离2.0 m设计目标,托举线圈半径最优值为1.7 m,相应的电流为3.49 kA,为实现对悬浮磁体偏移运动的有效阻减及控制,平衡点附近工作区域应限制在垂直位移Δz<0.1 m、水平位移Δer<0.05 m、倾斜角位移Δα<π/24;分析了TSR线圈对悬浮线圈的影响,计算显示TSR与悬浮线圈产生对向漂移,漂移幅度与径向位置有关,同时TSR线圈侧原本闭合磁力线被破坏,造成输运粒子损失;采用1.5 kg永磁完成了悬浮实验装置概念设计,分析表明永磁体与托举线圈间距0.1 m,铜导托举线圈电流895 A,满足控制对响应速度的要求。

CAT-1 is the first domestic magnetic confinement fusion device to use a magnetic levitation dipole field magnet design.Based on the overall goals and parameter design requirements of the CAT-1 device,this paper uses a simplified line current model,and employs vector magnetic field,mechanical equilibrium,and dynamics methods to complete the equilibrium stability analysis of the superconducting magnetic levitation system,and provides parameter design results.A simplified permanent magnet levitation experimental device has been preliminarily designed to verify the stability of the superconducting magnetic levitation system and the reliability of the parameters.The results show that for the CAT-1 device′s levitation magnet weighing 1200 kg,current of 5 MA,and levitation distance of 2.0 m design goals,the optimal value of the lifting coil radius is 1.7 m,and the corresponding current is 3.49 kA.In order to effectively reduce and control the displacement of the levitated magnet,the working area near the equilibrium point should be restricted to vertical displacementΔz<0.1 m,horizontal displacementΔer<0.05 m,and tilt angle displacementΔα<π/24.The influence of TSR coil on the suspended coil is analyzed.The calculation shows that TSR and the suspended coil drift in the opposite direction,the drift amplitude is related to the radial position,and the originally closed magnetic field line on the side of the TSR coil is destroyed,resulting in the loss of the transported particles.A conceptual design of a levitation experiment device using 1.5 kg permanent magnets was completed,and the analysis showed that the distance between the permanent magnet and the copper levitation coil of 0.1 m,levitation coil current of 895 A satisfying the requirements for control response speed.