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Investigation of the dependency of JET midplane separatrix density as a function of engineering parameters
Contributions to Plasma Physics ( IF 1.3 ) Pub Date : 2020-04-19 , DOI: 10.1002/ctpp.201900157
Julio J. Balbin-Arias 1 , Jerome Bucalossi 1 , Hugo Bufferand 1 , Guido Ciraolo 1 ,
Affiliation  

Midplane separatrix density is a crucial parameter in tokamaks since it strongly impacts divertor conditions. Scaling midplane separatrix density, ne, SEP, and pedestal density, ne, PED, as function of engineering parameters such as auxiliary heating Pinjected, toroidal magnetic field BT, and plasma poloidal current Ip are relevant to observe the effect of tuning these parameters on, for example, quality of confinement and divertor regime governed by ne, PED and ne, SEP, respectively. Thus, a dataset of JET H‐mode pulses performed with Iter like wall (ILW) has been analysed. Midplane density data are collected from an HRTS (high‐resolution Thomson scattering) diagnostic and ne, SEP is determined using the power balance method. Parallel heat flux model is chosen using transport code SOLEDGE2D (S2D) applying power balance method over a simulated ne, SEP and Te, SEP profiles to obtain separatrix positions. The parameters are averaged over time windows with order of (85–185 ms) and the magnetic configuration has been fixed to avoid divertor geometrical effect on ne, SEP determination, configuration chosen is corner–corner. A ratio between separatrix density and pedestal density at outer midplane ranges between 0.3 and 0.7 on the data set. A scaling law of ne, SEP/ne, PED is obtained as function of Pinjected, BT, and IP.

中文翻译:

JET中平面分离密度与工程参数的关系研究

在托卡马克中,中平面分离密度是一个关键参数,因为它会强烈影响偏滤条件。根据工程参数(例如注入的辅助加热P,环形磁场B T和等离子极向电流I p)的变化,缩放中平面分离线密度n e,SEP和基座密度n e,PED的函数与观察磁滞效应有关。在例如由n e,PEDn e,SEP控制的约束质量和分流器范围上调整这些参数, 分别。因此,已经分析了使用Iter like wall(ILW)执行的JET H模式脉冲的数据集。平面密度数据从HRTS(高分辨率汤姆逊散射)诊断,并收集Ñ ë,SEP被使用的功率平衡方法测定。使用传输码SOLEDGE2D(S2D)施加的功率平衡方法在模拟被选择平行热通量模型Ñ ë,SEPŤ ë,SEP型材以获得分界面位置。的参数在时间上平均窗用的(85-185顺序 毫秒)和磁性构型已被固定,以避免对偏滤器几何效应Ñ ë,SEP确定,选择的配置是角落。在数据集上,外中平面处的分离密度与基座密度之比在0.3到0.7之间。获得n e,SEP / n e,PED的比例定律,作为P注入B TI P的函数。
更新日期:2020-04-19
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