基于3维实体重建的直线加速器加速管热稳定性的优化设计
Optimized design on thermal stabilization of Linac tube based on solid 3D reconstruction
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摘要: 行波电子直线加速器运行时加速管腔体因铜损会产生不均匀的热变形和腔频率偏移。因无法获知腔频率的准确偏移值，设计加速管冷却系统的一种经验设计方法是控制管体温度离散度在3 ℃之内。提出并实现了一种以直接控制加速管腔体频率离散度为设计目标的方法。采用插值蒙皮曲面造型理论，依据温度场和热变形的有限元仿真结果，高精度重建出变形后的腔体3维实体模型。将其导入到电磁场分析软件微波工作室，解算出不均匀温度分布造成的热变形引起的各腔频率偏移，实现了热-结构-电磁场的耦合分析。以加速管腔体频率离散度最小为设计目标，获得冷却系统优化参数。相对于经验设计方法，可大大减小冷却水流量和水压差，节约运行成本。Abstract: Copper loss on Linac causes non-uniform thermal deformation and frequency shift of the cavities. The traditional thermal design method empirically requires to control the temperature variation of the accelerator tube within 3 ℃, since the actual frequency shift is difficult to obtain. A new approach has been proposed and implemented. It controls resonant frequency dispersion of the cavities directly, instead of temperature variation. A 3D reconstruction technique, which utilizes skinning surface modeling theory, is employed to rebuild the deformed model of cavities from finite element method (FEA) model. The reconstructed models are imported into Microwave Studio to solve the resonant frequencies of all the cavities to realize thermo-structure-electromagnetic field coupling analysis. The
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Key words:
- linear accelerator /
- thermal deformation /
- 3d reconstruction /
- frequency change /
- optimized design /
- cooling system
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