面向等离子体部件沉积特性的数值模拟研究
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摘要
采用粒子模拟研究方法,利用PEGASUS程序对等离子体环境下面向等离子体部件的沉积特性进行了模拟研究。结果显示部件表面连接缝隙尺寸、表面粗糙度、粒子入射的角度以及流量对沉积影响显著。在能量较小、溅射可忽略时,能量对沉积的影响很小。粗糙度越小,沉积量越小;同一种粗糙度,不同轮廓也会使沉积发生较大变化,轮廓一致的更有利于减小沉积。该模拟对研究等离子体与材料相互作用,分析瓦片缝隙尺寸、瓦片加工工艺和等离子体参数对面向等离子体部件沉积行为的影响具有重要意义。
In this paper, the deposition characteristics of plasma facing components(PFCs) in plasma environment are simulated by using PEGASUS software with particle simulation method. The results show that the PFCs' geometry, surface roughness, angle of incidence, and flux have a significant effect on the deposition.The influence of incident energy on deposition is small when the energy is small and sputtering is negligible. The smaller the roughness is, the smaller the deposition amount will be. With the same roughness, different contours can also cause large changes in deposition, and it is more possible to reduce deposition when the contour structures are conformable. This simulation is of great significance for investigating on interactions between plasma and PFCs, and analyzing the influence of tile gap dimensions, tile processing technology and plasma parameters on the deposition behaviors of PFCs.
In this paper, the deposition characteristics of plasma facing components(PFCs) in plasma environment are simulated by using PEGASUS software with particle simulation method. The results show that the PFCs' geometry, surface roughness, angle of incidence, and flux have a significant effect on the deposition.The influence of incident energy on deposition is small when the energy is small and sputtering is negligible. The smaller the roughness is, the smaller the deposition amount will be. With the same roughness, different contours can also cause large changes in deposition, and it is more possible to reduce deposition when the contour structures are conformable. This simulation is of great significance for investigating on interactions between plasma and PFCs, and analyzing the influence of tile gap dimensions, tile processing technology and plasma parameters on the deposition behaviors of PFCs.
引文
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[2]吕广宏,罗广南,李建刚.磁约束核聚变托卡马克等离子体与壁相互作用研究进展[J].中国材料进展,2010,29(7):42-48.
[3]朱士尧.核聚变原理[M].合肥:中国科学技术大学出版社,1992.280-320.
[4]Federici G,Skinner H C,Brooks J N,et al.Plasma-material interactions in current tokamak sand their implications for next step fusion reactors[J].Nucl.Fusion,2001,41(12):1967-2137.
[5]曾晓晓,才来中,吴婷.石英晶体微天平在HL-2A装置上的应用[J].核聚变与等离子体物理,2017,37(2):144-151.
[6]邓柏权,彭利林,严建成,等.偏滤器材料溅射过程的数值研究(英文)[J].中国核科技报告,2003,1:251-260.
[7]Rudakov D L,Stangeby P C,Wampler W R,et al.Net versus gross erosion of high-Z materials in the divertor of DIII-D[J].Phys.Scr.,2014,T159:014030.
[8]Dorene Ross,Mary Brownell,Paul Sindelar,et al.Kinetic calculation of plasma deposition in castellated tile gaps[J].J.Nucl.Mater.,2007,363-365(2):560-564.
[9]Tanabe T.Atomic and plasma-material interaction data for fusion[J].Suppl.Nucl.Fusion,1994,5.
[10]赵成利,孙伟中,刘华敏,等.聚变堆中碳原子在碳氢薄膜表面再沉积行为的分子动力学模拟研究[J].核聚变与等离子体物理,2010,30(4):312-316.
[11]Litnovsky A,Philipps V,Wienhold P,et al.Experimental investigations of castellated monoblock structures in TEXTOR[J].J.Nucl.Mater.,2005,337-339(1):917-921.
[12]Schmid K,Mayer M,Adelhelm C,et al.Impact of gyro-motion and sheath acceleration on the flux distribution on rough surfaces[J].Nucl.Fusion.2010,50(10):105004.
[13]Wienhold P,Esser H G,Hildebrandt D,et al.Investigation of carbon transport in the scrape-off layer of TEXTOR-94[J].J.Nucl.Mater.,2001,290-293:362-366.
[14]Kreter A,Borodin D,Brezinsek S,et al.Investigation of carbon transport by 13CH4 injection through graphite and tungsten test limiters in TEXTOR[J].Plasma Phys.Contr.Fusion,2006,48(9):1401-1412.