L-mode plasmas analyses and current ramp-up predictions for a JT-60SA hybrid scenario
L-mode plasmas analyses and current ramp-up predictions for a JT-60SA hybrid scenario
复制标题
JT-60SA 混合场景的 L 模式等离子体分析和电流上升预测
DOI：
10.1088/1361-6587/abcba9
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发表时间：
2020
影响因子：
2.2
通讯作者：
T. Goodman
中科院分区：
文献类型：
--
作者：
J. Morales;J. Garcia;G. Giruzzi;J. Artaud;C. Piron;M. Vallar;T. Goodman
在这项工作中，L-模式分析进行，以评估的电子回旋共振加热（ECRH）辅助电流斜升阶段的预测JT-60 SA托卡马克混合场景#4-2的建模框架。我们比较了两个湍流传输模式，CDBM和TGLF，使用集成的模拟程序CRONOS。模型验证的基础上，在JET等离子体的L-模式斜升阶段，和平顶L-模式TCV（托卡马克配置变量）等离子体与应用ECRH。在Zeff和边缘电子温度（Te）的参数扫描进行。我们的研究结果表明，有效的预测的q配置文件在JET斜升，如果边缘T e被正确捕获。事实上，我们的灵敏度扫描证明了强有力的影响，边缘T e q轮廓的演变。CDBM和TGLF模型的计算结果与实验结果吻合较好。相对于JT-60 SA混合方案，需要大量的ECRH离轴，以保持在整个等离子体半径上的q分布高于1。基于功率沉积位置的分析，我们发现，ECRH应用于接近ρ = 0.33允许大于1的q分布和高中心Te之间的折衷。我们评估了两个当前的斜升速率，其中快速率是慢速率的两倍。快速坡道的情况下所需的ECRH的数量被认为是更大的几乎是一个因素的两个比所需的缓慢坡道的情况。
In this work, L-mode analyses are performed in order to assess a modeling framework for the prediction of electron cyclotron resonant heating (ECRH) -assisted current ramp-up phases for JT-60SA tokamak hybrid scenario #4-2. We compare two turbulence transport models, CDBM and TGLF, using the integrated modeling code CRONOS. Model validation is performed on the basis of an L-mode ramp-up phase in a JET plasma, and a flat-top L-mode TCV (Tokamak a configuration variable) plasma with applied ECRH. Parameter scans in Zeff and in-edge electron temperature (T e ) are performed. Our results indicate effective prediction of the q profile in JET ramp-up if edge T e is properly captured. Indeed, our sensitivity scan demonstrates the strong impact of edge T e on q profile evolution. The results of CDBM and TGLF modeling show good agreement with the experimental measurements. With respect to a JT-60SA hybrid scenario, a significant amount of ECRH off-axis is required to maintain a q profile above unity across the entire plasma radius. Based on an analysis of power deposition location, we find that ECRH applied close to ρ = 0.33 allows a compromise between a q profile larger than unity, and high central T e . We evaluate two current ramp-up rates, where the fast rate is double that of the slower rate. The quantity of ECRH required for the fast ramp scenario is found to be greater by almost a factor of two than that required in the slow ramp scenario.