论文标题
在低血浆$β$处良好限制快速离子的准静脉构型
A quasi-isodynamic configuration with good confinement of fast ions at low plasma $β$
论文作者
论文摘要
获得了针对低血浆$β$限制的新的准静脉恒星构型。使用Stellopt套件进行数值优化。已经包括了与快速离子限制的准静脉动力学和质量接近的新代理。新的配置具有磁场强度，低磁性剪切和旋转变换的多封闭轮廓，允许岛分流。它显示出理想和热量的磁性水力动力稳定性，最高$β= 5％$，降低有效波纹，在等离子体核中，$ε_{eff} <0.5％$。即使在低$β$的情况下，配置也大约满足最大$ j $属性，并且快速离子的限制在$β\ sim 1.5％$时也很好，并且在反应堆值中变得非常出色，$β\ sim 4％$。对$ d_ {31} $新古典单一能量系数的评估支持了限制在准静脉配置中的等离子体的减少引导电流的期望。呈现了一组丝状线圈，以保留核心中快速离子的良好限制。
A new quasi-isodynamic stellarator configuration optimized for the confinement of energetic ions at low plasma $β$ is obtained. The numerical optimization is carried out using the STELLOPT suite of codes. New proxies to measure closeness to quasi-isodynamicity and quality of fast ion confinement have been included. The new configuration has poloidally closed contours of magnetic field strength, low magnetic shear and a rotational transform profile allowing an island divertor. It shows ideal and ballooning magnetohydrodynamic stability up to $β= 5%$, reduced effective ripple, with $ε_{eff} < 0.5%$ in the plasma core. Even at low $β$, the configuration approximately satisfies the maximum-$J$ property, and the confinement of fast ions is good at $β\sim 1.5%$ and becomes excellent at reactor values, $β\sim 4%$. An evaluation of the $D_{31}$ neoclassical mono-energetic coefficient supports the expectation of a reduced bootstrap current for plasmas confined in quasi-isodynamic configurations. A set of filamentary coils that preserve the good confinement of fast ions in the core is presented.
