Experimental and Numerical Study of High-Z Impurity Transport with Resonant Magnetic Perturbations i

被引量 : 0次 | 上传用户:Tiger7
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The effects of resonant magnetic perturbations(RMPs)on the behavior of high Z-number impurities in the core of tokamak plasmas have been studied using1D and3D impurity transport codes.Spatial distributions and temporal evolutions of impurities observed by extreme ultraviolet(EUV)spectrometry at the Experimental Advanced Superconducting Tokamak(EAST)serve as the basis for the transport numerical simulations.Line radiation emissions of impurities(e.g.carbon,lithium,iron and tungsten)were monitored to study the impurity response to RMPs.All impurity intensities are observed to decline by the application of RMP fields,during stages of mitigation or suppressed edge localized modes(ELMs)instabilities during high performance mode(H-mode)operation.  The~50%to70%reductions in Fe and W emissions with n=1(n:toroidal mode number)RMPs are more significant than those of low-Z carbon and lithium emissions(~30%).Small changes in stored energy,ne and Te do not account for the impurity emissions mitigation,so the measurements indicate that RMPs significantly and selectively decrease the impurity accumulation in the core region with minimal impact on plasma confinement.A purely inertial particle pump-out process is ruled out,and the targeted effect on the most detrimental(higher-Z)impurities highlights a promising advantage of RMPs use for impurity control,owed to transport effects from changes in the magnetic topology.  The transport coefficients of impurity ions are calculated with the STRAHL1D impurity transport code,based on measured Fe-ⅩⅩⅢprofiles.It is found that DFe increases from1.0-2.0m2s-1to1.5-3.0m2s-1from the boundary of the core region outward(p>0.50)after the onset of RMPs.Meanwhile,vFe shows a decrease in the outward direction in the core.The DFe and vFe variations combined lead to reduced Fe profiles.The diffusion shows anomalous values toward the edge,expression of the increased stochasticity produced tjere by the RMPs breaking of toroidal symmetry and the introduction of3D fields.The increase in diffusivity is not entirely localized at the edge and also allows the exhaust of high-Z core impurities.  The3D edge impurity transport code EMC3-EIRENE is applied for the first time in an RMP case at EAST to study impurity transport.A toroidal phase dependence is found in the distribution of impurities as a result of the RMP coils toroidal asymmetry showing typically anomalous transport phenomena such as blobs and filaments of impurity concentration.The exhaust of C-Ⅵtoward the scrape-off layer(SOL)and the overall suppression of W are observed in the cases with RMPs,confirming the feasibility of using the method for active impurity control in fusion plasmas.
其他文献
稠油电脱盐后的盐含量达不到3mg/L以下,则中国石油化工行业迫切需要解决的问题.为了解决这一燃眉之急,该文深入的研究了一项全新的电脱盐工艺技术-稠油高频高压油水分离工艺
随着高能物理研究的不断深入,对于研究设备的要求越来越高.作为射线探测器重要组成部分的闪烁体的研究越来越收受到重视,其中新型高性能闪烁玻璃的研制是一个热点.在该次试验
该文采用过氧化物硫化体系对CPE的硫化进行了研究,分析了各种配合剂对硫化胶性能的影响,得出最佳配方为DCP为4~6phr,TAC为4~5phr,炭黑为50phr及DOP为20phr.通过元素分析和红外
该文通过对Ti-46.5Al-2.0Cr-1.5Nb-1.0V合金块状反应和块状组织退火分解过程的研究,获得了有效控制合金显微组织参数的热处理工艺规范,得到了区分晶粒尺度与片层厚度的全片层
该文首先调查和分析了车轮在高速条件下的服役条件和失效形式,并对引起辋裂的应力和夹杂物尺寸进行了断裂力学计算;然后对国内外九种有代表性的车轮钢组织、常规力学性能及疲
该论文中选择了Cu-Co,Co-W,Ni-W,和Ni-Sc等几个二元金属系统分别进行了多层膜的固态界面反应和离子束混合的实验研究.在对Cu-Co系统(生成热为+10 KJ/mol)的研究中,通过固态界
该文阐述了三方面内容:驱动器的动态特性、驱动器振动模式的计算机模拟和压电陶瓷温度稳定性研究.该论文给出了三角波驱动信号下驱动器的工作特性和频率特性.由于三角波包含
在“互联网+”的时代背景之下,教学领域迎来了教育信息化发展模式,能够支持师生之间进行高效的互动,让课堂教学迸发出不一样的生机与活力.尤其是在计算机应用基础课程教学中,
聚变能是一种“清洁安全、永久性”能源,它的实现将一劳永逸地解决人类的能源需求,大幅度地减少环境污染。然而材料问题是实现聚变能走向应用的“瓶颈”问题之一。SiCf/SiC复
该文设计与制作了高压力下测量热激电流的装置,成功实现了在高压力下测量热激电流谱.用该装置测量了聚酰亚胺薄膜在不同压力下的TSC谱,发现压力的增加使TSC的峰温移向高温方