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本文用数值模拟法,通过数值求解二维多流体等离子体输运方程。来模拟托卡马克边界等离子体输运过程和输运特性。模拟计算的结果,对托卡马克偏滤器和第一壁的设计有重要意义。 相似文献
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《核工业西南物理研究院年报》2005,(1):172-178
先进等离子体材料表面复合优化处理技术及应用的研究,托卡马克边缘等离子体现象及线光谱轮廓的遗传算法模拟,HL-2A装置等离子体的边界识别和实时显示,高比压等离子体中电子温度梯度不稳定性的回旋动力学研究,HL-2A托卡马克偏滤器中的等离子体密度测量和分析,……[编者按] 相似文献
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本文研制了适用偏滤器位形的1-1/2维托卡马克输运程度,并该程序模拟了托卡马克装置放电期间偏滤器位形的演化。在纯欧姆加热和有辅助加热两种放电方式下,对不同等离子体电流分布,拉长比,三角形变等参数下等离子体平衡位形的演化过程进行了计算机模拟。 相似文献
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边缘等离子体模拟发展的动力主要来自研究偏滤器所具有的大容量排灰、排热和控制大量杂质的三大功效。随着托卡马克加热功率和密度的增加,偏滤器一般要经过线性状态,高再循环状态以及脱栏状态。 相似文献
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HL-2A装置是一个具有偏滤器位形的托卡马克装置,为我们开展先进偏滤器物理实验和改善主等离子体约束性能研究准备了良好的条件。等离子体的杂质含量由杂质源分布以及SOL和芯部等离子体中各种杂质输运过程确定。由于离子碰撞可导致狭窄的偏滤器入口部件处杂质溅射的增强,与起源于靶板处的杂质相比,偏滤器入口处的杂质更有效地污染芯部等离子体。 相似文献
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在托卡马克偏滤器区域充入杂质气体是检验偏滤器杂质屏蔽效应的重要手段。利用快速极紫外EUV光谱仪对EAST托克马克装置上开展的偏滤器Ar杂质注入实验进行观测。结合NIST原子光谱数据库对2~50 nm范围内不同电离态Ar的线光谱进行了谱线识别,识别出Ar Ⅳ,Ar Ⅸ-Ⅺ,Ar ⅩⅣ-ⅩⅥ等若干个电离态的谱线。为了同时观测等离子体不同区域的Ar杂质行为,在杂质注入实验时重点监测Ar ⅩⅥ35.39 nm(Ar ⅩⅥ电离能918.4 eV,主要分布在等离子体芯部)和Ar Ⅳ44.22 nm(Ar Ⅳ电离能9.6 eV,主要分布在等离子体边界)这两条谱线。利用该两条谱线强度随时间演化的结果初步分析了偏滤器杂质屏蔽效应。在同一充气口不同等离子体位形下的实验结果表明偏滤器对于从偏滤器区域注入Ar杂质的屏蔽效果优于从主等离子体区域注入,并且下偏滤器及内冷泵的综合粒子排除能力优于上偏滤器。 相似文献
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HL-2A装置是带封闭偏滤器的磁约束托卡马克实验装置,于2002年底建成并通过国家验收。2003年在各子系统准备充分和等离子体水平位移反馈控制系统投入运行后,实现了首次重复的偏滤器位形等离子体放电实验。 相似文献
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在高约束模式下发生的边界局域模会释放高能量等离子体,其中主要部分会辐照到面积相对较小的偏滤器靶板,偏滤器钨靶板发生热腐蚀的可能性最大.本文建立了包括了熔化、汽化和热辐射效应的一维热传导模型,采用数值模拟的方法,研究了EAST未来偏滤器钨靶板在边界局域模作用下的热腐蚀程度.根据现有的边界局域模热流数据和多种未来可能的高能量边界局域模热流数据,计算了钨靶板的表面温度分布.结果显示当前的第一类边界局域模作用在钨靶板上,在高约束模式运行时间取32 s情况下,靶板表面温度从350 K增加到373 K,表明在当前的参数范围内,只要避免其他更严重的瞬时事件如破裂的发生,边界局域模还不会带来严重的威胁;如果边界局域模的能量增加到接近未来托卡马克边界局域模的能量范围1 MJ/m2,沉积时间为600μs,表面最大熔化厚度将达到6.8—6.9μm. 相似文献
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The first results of divertor discharge and supersonic molecular beam injection on the HL-2A tokamak 总被引:1,自引:0,他引:1 下载免费PDF全文
HL-2A tokamak is the first tokamak with divertors in China. The
plasma boundary and the position of the striking point on the target
plates of the HL-2A closed divertor were simulated by the current
filament code and they were in agreement with the diagnostic results
in the divertor. Supersonic molecular beam injection (SMBI) system
was first installed and tested on the HL-2A tokamak in 2004. In the
present experiment low pressure SMBI fuelling on the HL-2A closed
divertor was carried out. The experimental results indicate that the
divertor was operated in the `linear regime' and during the period of
SMB pulse injection into the HL-2A plasma the power density convected
at the target plate surfaces was 0.4 times of that before or after
the beam injection. It is a useful fuelling method for decreasing the
heat load on the neutralizer plates of the divertor. 相似文献
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The edge plasma characteristics are studied by both a movable array of
Mach/Reynolds stress/Langmuir 10-probes in the boundary region and the fixed
flush probe arrays on the 4 divertor neutralization plates at the same
toroidal cross-section in the HL-2A tokamak. The dependence of the
Reynolds stress on poloidal flow in the edge plasma is analysed. The result
indicates that the sheared poloidal flow in tokamak plasma can be induced by
the radial gradient of Reynolds stress. In the divertor experiments of
HL-2A, the profiles of the electron temperature, density and floating
potential on divertor plates are measured by the flush probe arrays. The
edge electron temperature in divertor configuration is higher than that in
limiter configuration. The temperature asymmetry between outer and inner
target plates
is observed. The result of magnetic surface reconstructed from 18 Mirnov
coils signals is presented. Both the particle recycling and the impurity
flux in the bulk plasma during divertor discharges are discussed. Neutral
gas pressure in divertor chamber, measured by fast ionization gauge during
divertor discharge, is given. 相似文献
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介绍了基于MATLAB 程序自主开发的等离子体位形编辑和设计代码SE,包括其设计原理、主要功能、人机界面和操作步骤。通过SWEQU 代码对SE代码的准确性进行了有效验证,分别用上述两种代码设计和验证了两种具有中等拉长比和三角形变位形的放电参数。具有较高拉长比和三角形变位形的实现需要投入装置的上偏滤器线圈来突破圆形截面的限制。最后通过SE代码编辑了一个较大拉长比和三角形变的等离子体位形,并获得了相应的放电参数。结果表明,在HL-2A 装置投入上偏滤器线圈后,可以得到具有较大拉长比和三角形变的新等离子体位形,这些位形为提高HL-2A 等离子体的品质奠定了坚实的基础。 相似文献
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DENGBai-quan YANJian-cheng PENGLi-lin 《核聚变与等离子体物理》2005,25(2):139-145
A new bipartition neutral transport model has been developed for simulation of the hydrogenic neutral particle transport in the vicinity of HL-2A divertor target plate. The numerical calculation results on the basis of this model are fairly consistent with the results obtained with the “multi-generation method”. One possible application of this model is to provide a source term originating from neutral transport calculation for any other edge plasma transport code, for instance, B-2 code, which has been used to simulate edge plasma transport of the HL-2A divertor configuration. Especially it can be utilized to quickly classify the plasma in divertor region as high or low recycling regime. 相似文献
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A hybrid method for tokamak MHD equilibrium configuration reconstruction is proposed and employed in the modified EFIT code. This method uses the free boundary tokamak equilibrium configuration reconstruction algorithm with one boundary point fixed. The results show that the position of the fixed point has explicit effects on the reconstructed divertor configurations. In particular, the separatrix of the reconstructed divertor configuration precisely passes the required position when the hybrid method is used in the reconstruction. The profiles of plasma parameters such as pressure and safety factor for reconstructed HL-2A tokamak configurations with the hybrid and the free boundary methods are compared. The possibility for applications of the method to swing the separatrix strike point on the divertor target plate is discussed. 相似文献
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对HL-2A装置限制器位形和偏滤器位形下放电气体分别为氘和氦时的等离子体热辐射测量结果做了初步分析,分析结果表明:在偏滤器室注入惰性气体能够有效的降低到达靶板的热辐射;超声分子束注入时,观测到注入粒子在等离子体中输运过程;氦放电时的辐射比值明显高于氘放电时的比值;真空室器壁的处理能够有效地降低辐射损失,硅化对器壁条件的改善效果明显。 相似文献
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在HL-2A装置偏滤器靶板上采用嵌入式静电三探针阵列和偏滤器室内的电动扫描四探针组测量了同一极向截面的内外中性化板上和偏滤器室内的电子温度、密度、悬浮电位、空间电位、电场、电子压强及其分布,研究了偏滤器中等离子体参数的分布及非对称性和脱靶等离子体运行模式下的等离子体行为,开展了偏滤器脱离靶板等离子体的实验研究。利用主真空室的快速往复扫描三台阶式六探针系统测量了主等离子体边缘和偏滤器室内的等离子体温度、密度、粒子通量和中性粒子密度等参数,研究了脱靶等离子体的形成过程、物理特性、控制方法,以及对主等离子体性能的影响。 相似文献