聚变强磁场下真空测量电离规结构及阴极灯丝优化研究  

Optimization of Ionization Gauge to Be Used in Strong Magnetic Field in TOKAMAK

作　　者：陈长琦[1] 刘腾飞[1] 朱武[1] 汪根生[1] 吴振伟[2] 郭后杨[2] 

机构地区：[1]合肥工业大学机械与汽车工程学院真空科学技术与装备研究所,合肥230009 [2]中国科学院等离子体物理研究所,合肥230031

出　　处：《真空科学与技术学报》2012年第11期1042-1047,共6页Chinese Journal of Vacuum Science and Technology

基　　金：国家ITER配套973计划(2010GB104000);先进偏滤器及边界等离子体诊断技术(2010GB104004)--ASDEX压力快规关键技术研究

摘　　要：基于强磁场环境中托卡马克装置偏滤器中性粒子压力快速测量,使用普通热阴极电离计,难以实现托卡马克偏滤器实验运行的原位精确测量。文章针对普通热阴极电离计的结构特点,首先探究了强磁场下,阴极发射电子的运动轨迹受磁场约束对规管灵敏度的影响。应用有限元方法,计算分析了阴极灯丝受电动力以及热应力和电动力耦合作用下发生形变的规律,得到阴极灯丝应力、总变形量和轴向变形量数据以及阴极灯丝的热力性能不受加热电流变化影响的结论。提出可在强磁场下稳定工作的规管结构设计方案,得到阴极灯丝优化结果,为聚变装置强磁场下真空测量快规的优化设计提供参考。The structure and filament of the conventional ionization gauge were optimized,designed,and fabricated to rapidly measure the pressure,originated from neutral particle,in the strong magnetic field in the divertor of the TOKAMAK.The sensitivity of the gauge was found to depend strongly on the impact of the strong magnetic field on the trajectories of the electrons,emitted from the hot filament.The possible deformation of the hot filament,caused by the electric and temperature fields,was modeled and simulated in finite element method.The simulated results show that the variations in the heating current little affect the thermal properties of the filament with different diameters and lengths.Moreover,various factors,including the stress,total deformation,and axial deformation of the filament,were obtained.Based on the simulated results,the structure of the ionization gauge was optimized for the purpose of rapid pressure measurement in strong magnetic field.

关 键 词：强磁场 灵敏度 电动力 形变 

分 类 号：TB77[一般工业技术—真空技术]