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聚变堆的纵场线圈通常采用无弯矩的恒张力线圈,即D形线圈,这是种尺寸巨大且场强高的纵场线圈,其受电磁力的作用机械支撑问題甚突出。 恒张力线圈的概念最初由File等人提出。最初的D形轮廓线(通常称为PrincetonD)是根据纵场场强与半径成反比(即B_θ∝1/R)的简化条件求解的,也就是假定整个环形纵场线圈沿环向连续均匀地分布。但实际上,纵场线圈总是做成分立的。因为诸如各种注入、加热和抽真空等通道需在线圈之间插入,目前的趋势是在满足等离子体外缘磁场纹波要
The longitudinal coil of the fusion reactor usually adopts a constant tension coil without bending moment, that is, a D-shaped coil, which is a kind of longitudinal field coil with a large size and a high field strength. The mechanical support of the longitudinal coil is strongly influenced by the electromagnetic force. The concept of constant tension coils was first proposed by File et al. The initial D-shaped contour (often called PrincetonD) is solved based on the simplified condition that the vertical field strength is inversely proportional to the radius (ie, B_θα1 / R), that is, assuming that the entire toroidal longitudinal field coil is continuously and evenly circumferentially distributed. But in fact, the longitudinal field coil is always made discrete. Because channels such as various implants, heating, and evacuation need to be inserted between the coils, the current trend is to satisfy the magnetic ripple in the plasma periphery