STEP电站的平顶等离子体运行空间
Flat-top plasma operational space of the STEP power plant
AI总结：
STEP球形托卡马克电站通过集成建模工作流和JETTO模型开发平顶运行点，扫描关键等离子体参数确定运行空间，在两种辅助加热方案和不同约束假设下共生成四个候选运行点。
摘要：
STEP是一个球形托卡马克原型电站，旨在演示净电功率输出。设计阶段涉及利用等离子体模型优化聚变性能，同时满足各种物理和工程约束。已开发一个建模工作流，包括集成堆芯等离子体建模、MHD稳定性分析、SOL和台基建模、线圈组与自由边界平衡求解器以及全电站设计，用于确定设计参数并开发可行的方案。集成堆芯等离子体模型JETTO用于开发满足聚变功率性能约束的平顶运行点。扫描了归一化beta、Greenwald密度份额、辅助功率和辐射功率等关键参数，以确定运行空间并推导候选非感应平顶点。假设的辅助加热和电流驱动仅来自电子回旋系统或电子回旋与电子伯恩斯坦波组合。在当前输运建模阶段，相关参数区间的整体约束存在较大不确定性。针对两种辅助加热和电流驱动系统方案，基于不同约束假设各开发了两个候选平顶点，共四个运行点。较低约束假设通常指向高密度、高辅助功率区间的运行点，而较高约束则允许在维持目标聚变性能的同时进入更宽的密度和功率参数区间。
英文摘要：
STEP is a spherical tokamak prototype power plant that is being designed to demonstrate net electric power. The design phase involves the exploitation of plasma models to optimise fusion performance subject to satisfying various physics and engineering constraints. A modelling workflow, including integrated core plasma modelling, MHD stability analysis, SOL and pedestal modelling, coil set and free boundary equilibrium solvers, and whole plant design, has been developed to specify the design parameters and to develop viable scenarios. The integrated core plasma model JETTO is used to develop individual flat-top operating points that satisfy imposed criteria for fusion power performance within operational constraints. Key plasma parameters such as normalised beta, Greenwald density fraction, auxiliary power and radiated power have been scanned to scope the operational space and to derive a collection of candidate non-inductive flat-top points. The assumed auxiliary heating and current drive is either from electron cyclotron systems only or a combination of electron cyclotron and electron Bernstein waves. At present stages of transport modelling, there is a large uncertainty in overall confinement for relevant parameter regimes. For each of the two auxiliary heating and current drive systems scenarios, two candidate flat-top points have been developed based on different confinement assumptions, totalling to four operating points. A lower confinement assumption generally suggests operating points in high-density, high auxiliary power regimes, whereas higher confinement would allow access to a broader parameter regime in density and power while maintaining target fusion power performance.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
