Engineering optimization of stellarator coils lead to improvements in device maintenance
Engineering optimization of stellarator coils lead to improvements in device maintenance
复制标题
仿星器线圈的工程优化可改善设备维护
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
A. Zolfaghari
中科院分区：
文献类型：
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作者：
T. Brown;J. Breslau;D. Gates;N. Pomphrey;A. Zolfaghari
作为早期PPPL试验工厂研究的一部分，进行了一项工程练习，以拉直仿星器模块化线圈（MC）的后腿，以便更好地接触等离子体部件。鞍形线圈位于单独的外壳内，并被配置为重建由伸直MC后腿引起的磁场变化。一项后续实验室指导的研究旨在通过考虑更高纵横比的等离子体沿着通过将工程维护要求添加到用于定义模块化线圈绕组配置的物理代码中来改进MC定义度量来进一步改进仿星器维护。升级了物理设计代码（COSFPT），以提供具有拉直MC后支腿的线圈解决方案，并接收MC表面几何形状和缠绕中心的工程约束输入。对COWPT ++进行了几项改进和扩展，包括：针对单个线圈的线圈惩罚和冻结线圈几何形状的能力;在限定MC绕组的空间曲线的几何形状上添加扭转约束;允许在外侧中平面上方和下方的不对称距离上自由拉直MC后腿;包括嵌套鞍与强制的最小线圈到线圈的分离距离，并增加了接受线圈绕组表面几何形状的能力，从Pro- E。这些变化沿着一些其他功能，大大提高了我们的能力，以实现更好的工程维护要求和等离子体表面重建与目标物理之间的自一致性。使用新的COSTOPPT ++代码，改进的维护仿星器设备的第一遍设计已经开发出来。将介绍代码细节和随后的器械设计。
As part of an early PPPL pilot plant study an engineering exercise was undertaken to straighten the stellarator modular coil (MC) back legs to provide greater access to plasma components. Saddle coils were located within separate enclosures and configured to reconstitute changes in the magnetic fields caused by straightening the MC back legs. A follow on lab directed research study looked to further improve stellarator maintenance by considering higher aspect ratio plasmas along with improving the MC defining metrics by adding engineering maintenance requirements to the physics code used in defining the modular coil winding configuration. The physics design code (COILOPT) was upgraded to provide coil solutions with straightened MC back legs and to receive inputs of engineering constraints on the MC surface geometry and winding centers. Several improvements and extensions of COILOPT++ were made which include: the ability to target coil penalties and freeze coil geometry for individual coils; adding torsion constraints on the geometry of the space curve defining the MC winding; allowing freedom to straighten MC back legs over asymmetric distances above and below the outboard midplane; the inclusion of nested saddles with enforced minimum coil-to-coil separation distances and adding the ability to accept coil winding surface geometry from Pro- E. These changes along with a number of other features have substantially improved our ability to achieve better self-consistency between engineering maintenance requirements and plasma surface reconstructions with targeted physics. Using the new COILOPT++ code, a first pass design of an improved maintenance stellarator device has been developed. The code details and the ensuing device design will be presented.