Recent developments in the structural design and optimization of ITER neutral beam manifold

This paper describes a new design of the neutral beam manifold based on a more optimized support system.A proposed alternative scheme has presented to replace the former complex manifold supports and internal pipe supports in the final design phase.Both the structural reliability and feasibility were confirmed with detailed analyses.Comparative analyses between two typical types of manifold support scheme were performed.All relevant results of mechanical analyses for typical operation scenarios and fault conditions are presented.Future optimization activities are described,which will give useful information for a refined setting of components in the next phase.     

分子动力学模拟C+离子与聚变材料钨的相互作用

采用分子动力学方法模拟不同能量的C+离子与聚变材料钨的相互作用.模拟结果表明:当C+离子入射剂量为3.11×1016 cm-2,入射能量为50eV时,样品表面形成一层碳膜;而入射离子能量为150和250eV时,C+离子入射到样品内与钨原子共同形成碳钨混合层,样品表面没有形成碳膜;碳的沉积率随能量的增大先减小后增加,溅射率随能量的增大先增大后减小;轰击后的样品中,碳原子密度、C-W键密度及C-C键密度分布都随能量的增加逐渐向样品内移动,且C-W键分布厚度随能量的增加而逐渐增加,C-C键分布厚度几乎不随能量变化;在作用过程中极少量的钨原子发生溅射,但引起钨品格损伤严重;碳在轰击后的样品中主要以Csp3杂化形式存在.     

Experiments and Studies of Edge Plasma Radial Transport and Confinement Property on the HL-1M Tokamak

1. IntroductionThe determination of flow velocity in scrape--offlayer (SOL) and the boundary of tokamak plasmahas become of prime importance due to its possible role in confinement and the L-H mode transition[l~3]. Recenjly, a radial electric .field E. near theplasma periphery has been found both experimentally and theoretically to play an important role inthe L-H transition [4-10]. In brief, theories attempting to explain the L-H transition are focused on E.,dEr/dr and/or pololdal veloci…     

超声分子束用于聚变等离子体加料

超声分子束注入在中国环流器一号和新一号装置首次采用。与常规送气相比,由于气体粒子注入深化,形成电子密度的峰化和密度极限的提高,并导致约束的改善。欧姆加热等离子体的能量约束时间的线性范围增长到ｎ＾－ｅ＝４×１０＾１９ｍ＾－３,实验结果表明,超声分子束注入是一种先进而简单的气体加料方法。     

弹丸和超声束流注入对 HL-1M 装置边缘电场和等离子体旋转的影响

介绍了ＨＬ－１Ｍ在不同放电条件下边缘等离子体流和径向电场的测量。实验发现：在多发弹丸注入（ＭＰＩ）和超声束流注入（ＳＢＩ）期间，托卡马克等离子体边缘的径向电场Ｅｒ发生变化，边缘等离子体的极向流剪切以及伴随着边缘扰动水平下降已观测到。     

Simulation Study for Divertor Geometry and Gas Puffing to Handle Huge Exhaust Power in HL-2M with SOLPS5.0

One of the critical issues to be solved for HL-2M is the power exhaust.Divertor target plate geometry strongly influences the plasma profiles by controlling the neutral recycling pattern,which in turn has a strong effect on the symmetry and stability of the divertor plasma and finally on the whole edge region.The numerical simulation SOLPS5.0 package is used to design and explore the divertor target plates for HL-2M.We start with the choice of a proper target plate geometry,which has a smaller incidence angle in the permissible space,and then discuss the method of gas puffing to reduce the heat flux density on the target and the effects of gas puffing on the divertor plasma performance.     

用C++Builder和Matlab联合编程实现数据处理的方法

介绍了如何用C Builder和Matlab联合编程的方法来实现中国环流器2号A的物理实验数据的处理．通常实验数据处理软件包括两大部分：常规处理软件和后处理软件．而开发软件C Builder和Matlab各有利弊；特别是实验数据后处理部分在C Builder下实现相当的复杂，如果利用Matlab引擎调用工具箱中的函数可节省二次开发工作量。保证程序的准确性．章着重介绍了如何在C Builder平台下，调用Matlab函数实现实验数据后处理问题．     

Measurement of Density Profile with Step—Swept Microwave Reflectometry

A one-channel microwave reflectometer is used to measure the electron density profile in a low-density plasma experiment (ne < 0.27 × 10~19 m-3) sustained by 2.45 GHz lower hybrid current drive (LHCD) on TRIAM-IM. In order to remove the effect of phase runaway phenomena, a step-like frequency-sweeping way is used and a special phase analysis technique is introduced. The density profile is reconstructed in TRIAM-IM with the swept frequency ranged from 6 GHz to 15 GHz. The corresponding cutoff density is from (0.045 ~ 0.28) × 10~19 m-3 in the ordinary polarization mode. The results are in good agreement with the measurements from a multi-channel 2 mm-wavelength interferometer.     

AXUV光电二极管探测器在聚变装置HL-2A热辐射测量系统上的应用

介绍应用pn结光伏效应制成探测器的光电探测原理及一种新型的AXUV光电二极管.中国环流器2号A(HL-2A)装置上利用新引进的AXUV光电二极管研制的热辐射测量系统成功地测量了该托卡马克装置中的热辐射损失.AXUV光电二极管探测器具有量子效应高、灵敏度高、响应快、抗电磁干扰能力强等优点;在实验中性能稳定,不易受干扰,并有很高的时间、空间分辨能力.     

Tomographic Analysis of Central MHD Activities and Radiation Losses on the HL-2A and LHD

Results of the two-dimensionally reconstructed distribution of soft X-ray emission in HL-2A and electromagnetic radiation in large helical device （LHD） are presented. Hardware improvements of in-vessel soft X-ray cameras and the development of tomographic software have made detailed and visual studies of soft X-ray emission possible in HL-2A. Several algorithms are employed in order to get as detail as possible in the images while keeping the guiding assumptions to a minimum. Recently success has been achieved in applying a 2D peeling away algorithm for tomographic reconstruction of LHD bolometric data jointly under the China-Japan collaboration. The data analysed so far have been used to study magnetohydrodynamic （MHD） instabilities on HL-2A tokamak and radiation losses on LHD.