HL-2A装置偏滤器位形下氢和碳的粒子通量比

等离子体-壁相互作用通过各种机制释放粒子，主等离子体中杂质的数量限制了装置的性能。要深入认识杂质释放的机制，测量和分析粒子通量非常重要。文献[1]中详细描述了用光谱方法测量托卡马克等离子体中来自局部表面的向内的杂质通量，文献[2]报道了用这种方法测定ASDEX装置ICRF加热条件下向内的铬的通量。     

导体壳对电阻磁流体不稳定性的影响

结合HL-1装置的条件,采用撕裂模的准线性理论,研究了托克马克中导体壁对m=2/n=1扰动模的稳定作用。着重研究了导体壁位置,等离子体电流分布,等离子体位形对这种稳定效应的影响。结果表明,共振面的位置与壁的稳定作用有密切关系,存q_a接近于2的位形中,m=2的撕裂模扰动可以被靠近等离子体的导体壁完全抑制。导体壁的稳定效应与等离子体电流分布相联系,在一些现实的电流分布中,只要适当地压低等离子体边界区的电流密度,壁的稳定效应会更加显现出来。     

翘曲S_1流面跨声速流函数解

一、前言 在叶轮机械工程设计、计算中,往往使用只计算一个中心S_1流面和若干个迴转S_1流面的准三元迭代解。为了得到更准确的全三元解,文献[1]在全三元迭代计算中使用了翘曲的S_1流面计算机程序。文献[3]则发展了使用曲面拟合方法的翘曲S_1流面程序。在跨声流动存在强烈激波间断时,流面形状会在激波处发生折转,流片厚度也会突变。由于这种三元效应的存在,有必要发展任意翘曲S_1流面跨声程序,进行全三元跨声迭代解。本文在文献[5]的基础上发展了翘曲S_1流面跨声计算机程序。     

环形非圆截面等离子体自由界面的磁流体平衡方程解

在有导体壁的条件下,对于各种趋肤的及趋中心分布的等离子体纵向电流,用一种统一的迭代方法,计算了相应的自由界面的磁流体平衡方程解,并讨论了这种方法适用的范围。 关键词：     

无反射势的Schrdinger方程严格解的三维推广

文献[1]给出无反射势V(x)=-N(N+1)sech~2x当N为任意正整数时schrodinger方程束缚态和散射态的严格解。本文推广文献[1]的工作,继续给出三维情况下无反射势Schrodinger方程束缚态和散射态的严格解,并得到了与一维情况不同的一些物理结果。     

用振幅-相位型全息透镜实现光学变换的一般理论

本文将文献[1]和[2]中所讨论的纯相位型的全息透镜系统实现光学变换的理论推广到更普遍情形,提出了用振幅-相位型全息透镜组所构成的光学系统实现给定线性变换的一般理论,推导出诸全息透镜的振幅和相位分布所满足的方程组,应用计算机迭代求解法,不难得到它们的解。     

x射线激光在激光等离子体中传输变化及其对诊断的影响

通过引进误差判断参数η并进行数量级分析，得到了x射线激光在等离子体中传输时的 相位和幅度满足的演化方程. 结果表明，相位的演化与电子密度直接有关，幅度变化的影响 可以忽略不计；而幅度的演化却与相位直接相关，与电子密度没有直接联系. 进一步分析表 明，只需满足η<1即可利用逐级迭代近似分析方法得到x射线在激光等离子体中传输时 的相位与幅度的演化近似解，并用数值模拟证实了这些迭代近似解的可靠性和准确程度. 关键词： 激光等离子体 电子密度 逐级迭代近似 误差判断参数     

非阿贝耳规范场的类粒子解

1.我们在文献[1—3]中,指出了一种求非阿贝耳规范场某些特定类型解的方法。在本文中我们指出此方法可以得到非阿贝耳规范场的类粒子解。我们的讨论是把此方法推广到N维空间具有O_N对称的非阿贝耳规范场,然后讨论O_N对称的非阿贝耳规范场的类粒子解。     

无碰撞等离子体波导的色散关系

一、引言 本文将文献[1]的工作推广,讨论片形与矩形无碰撞等离子体中,玻耳兹曼-麦克斯韦方程组边值问题的一般解。由引入以δ函数为核的积分变换,波矢空间中的多维色散关系均能化成一维的色散关系,使分析方法比文献[1]中采用的方法简易。并使有界波导中的波型与无界等离子体波型间的联系明晰化。得出在片形等离子体波导中除了存在相应于真空波导的TE波与TM波(E波)外,还存在第二类E波,它与静电波密切相关。其次讨论了矩形等离子体波导中的三类波型。最后在普遍情况下,求得相对论性的色散关系;求得相对论性质量效应对色散关系的修正量。     

无反射势的Schr?dinger方程严格解的三维推广

文献[1]给出无反射势V(x)=-N(N+1)sech²x当N为任意正整数时Schr?dinger方程束缚态和散射态的严格解。本文推广文献[1]的工作,继续给出三维情况下无反射势Schr?dinger方程束缚态和散射态的严格解,并得到了与一维情况不同的一些物理结果。 关键词：     

空间电荷限制流与传导电流的定量关系

 从空间电荷限制流假设、Poisson方程及电子正则动量守恒关系出发,推导了平板形、同轴圆柱和共顶点同轴圆锥三种导体构形的空间电荷流随传导电流变化的广义Poisson方程,给出了求解方法及解的基本特征,分析比较了三种导体构形空间电荷限制流的基本性质。通过推导,计算和分析可得：各种电压条件下传导电流对空间电荷限制（SCL） 流的作用效果不一样,电压越高传导电流提高磁绝缘程度的作用越显著;当几何因子(即高阻抗)较小时其它两种导体的SCL流与平板形相差较大,几何因子较大时与平板形十分接近;同样电压条件下负极性的SCL流比平板形小、正极形正好相反,而相同几何因子条件下同轴圆筒的SCL流比共顶点同轴圆锥的小;在分析研究低阻抗MITL时,采用SCL流的平板近似不会带来大的误差。在描述时变脉冲作用于MITL时,可以通过对SCL流随电压、传导电流变化的曲面函数插值的方法确定各个时刻的磁绝缘状态。     

斜位电流注入磁共振电阻抗成像（MREIT）与硬件设计

现有的磁共振电阻抗成像(MREIT)方法只适用于主磁场平行水平面的磁共振系统,本文中提出了一种新的MREIT方法即斜位电流注入磁共振电阻抗成像,同时适用于主磁场垂直于水平面的磁共振系统. 硬件系统以磁共振主控计算机为控制中心,将MRI与EIT有机结合于一体：(1)能够测量注入电流在成像体内部感应磁场的磁感应强度B(x,y,z);(2)向成像体注入电流;(3)满足时序匹配要求;(4)测量边界电压. 文章还展示了利用此装置所得的初步实验结果.     

Electromagnetic scattering from two-layered rough interfaces with a PEC object: vertical polarization

Electromagnetic(EM) scattering from a stack of two rough interfaces separating a homogeneous medium with a perfectly electric conducting(PEC) object has been calculated through the method of moments for vertical polarization.Theoretical formulations of EM scattering from multi-layered rough interfaces with a PEC object have been derived in detail and the total fields and their normal derivatives on the rough interfaces are solved.The two-layered model is a special case.In this work,a Gaussian rough surface was applied to simulate the rough interface.A cylinder was located above,between or below the two-layered rough interfaces.Through numerical simulations,the validity of this work is demonstrated by comparing it with existing scattering models,which are special cases that include a PEC object located above/below a single-layered rough interface and two-layered rough interfaces without an object.Subsequently,the influences of characteristic parameters,such as the relative permittivity of the medium,as well as the average height between the two rough surfaces,on the bistatic scattering coefficient are discussed.     

Application of a multiregion model to the EM scattering from a rough surface with or without a target above it

An efficient multiregion model is introduced to calculate the electromagnetic scattering from a perfectly electrical conducting(PEC) rough surface with or without a PEC target above it.In the multiregion model,the rough surface is split into multiple regions depending on their position along the rough surface.Two intermediate regions are chosen as the dominant region.If a target is located above the rough surface,the target will also be included in the dominant region.The method of moments(MOM) is only adopted on the dominant region to ensure validity.Hence,the new model can greatly reduce the number of unknowns associated with full MOM analysis.The induced electric currents on the other regions are obtained by approximately considering the mutual coupling between different regions along the rough surface.Compared with the published hybrid method,this new model is not only suitable for EM scattering from a target above a rough surface but also applicable for just rough surfaces.Several numerical simulations are presented to show the validity and efficiency of the multiregion model.     

二维导体微粗糙面与其上方金属平板的复合电磁散射研究

研究了二维导体微粗糙面与其上方金属平板复合电磁散射特征.应用互易性原理使求解二次散射场简化为求解包含平板上的极化电流和微粗糙面散射场的积分方程，从而降低了求解难度.应用物理光学近似和微扰法分别求解了平板上的极化电流和粗糙面的电磁散射场，得到了复合散射截面计算公式并进行了数值计算.尤其对该复合模型后向耦合电磁散射结果进行了详细分析和讨论. 关键词： 互易性原理 复合电磁散射 微粗糙面 平板     

非圆截面托卡马克轴对称模的反馈稳定

通过直接解真空区扰动磁面的边值问题,本文解析地研究了非闭合导壳对托卡马克中轴对称MHD模的反馈稳定性。我们取等离子体截面为椭圆,反馈系统由导壳和主动反馈线圈构成。结果表明,两块放在等离子体上下的导体块有很强的稳定作用;电阻壳可用以抑制高频模式,主动反馈线圈可用以稳定低频模式。 关键词：     

The harmonic inversion of the field-swept fixed-frequency resonance spectrum

When the spin Hamiltonian is a linear function of the magnetic field intensity the resonance fields can be determined, in principle, by an eigenfield equation. In this report, we show a new technical approach to the resonance field problem where the eigenfield equation leads to a dynamic equation or, more specifically, to a first order differential equation of a variable L(x), where x is associated with the magnetic field h. Such differential equation has the property that: its stationary solution is the eigenfield equation and the spectral information contained in L(x) is directly related to the resonance spectrum. Such procedure, known as the "harmonic inversion problem" (HIP), can be solved by the "filter diagonalization method" (FDM) providing sufficient precision and resolution for the spectral analysis of the dynamic signals. Some examples are shown where the resonance fields are precisely determined in a single procedure, without the need to solve eigenvalue equations.     

Green's function for arbitrarily shaped dielectric bodies of revolution

In this paper, a solution is developed to calculate the electric field at one point in space due to an electric dipole exciting an arbitrarily shaped dielectric body of revolution (BOR). Specifically, the electric field is determined from the solution of coupled surface integral equations (SIE) for the induced surface electric and magnetic currents on the dielectric body excited by an elementary electric current dipole source. Both the interior and exterior fields to the dielectric BOR may be accurately evaluated via this approach. For a highly lossy dielectric body, the numerical Green's function is also obtainable from an approximate integral equation (AIE) based on a surface boundary condition. If this equation is solved by the method of moments, significant numerical efficiency over SIE is realized. Numerical results obtained by both SIE and AIE approaches agree with the exact solution for the special case of a dielectric sphere. With this numerical Green's function, the complicated radiation and scattering problems in the presence of an arbitrarily shaped dielectric BOR are readily solvable by the method of moments.     

On the Frenkel problem of equivalent steady currents in a sphere

The Frenkel problem of substituting the 3D system of steady currents given in one of two concentric spherical regions by an equivalent system of currents (i.e., by that inducing the same external magnetic field) that is distributed over the surface of the other region is considered. A method of multipole moments providing the direct solution (without calculating the fields) of the problem is described. The case of currents with the density components represented by cubic polynomials of the Cartesian coordinates is considered as an example.     

多注速调管双重入式谐振腔的解析计算与仿真

 发展了一种计算多注速调管双重入式谐振腔的计算方法。根据场的等效原理将（模型等效后）腔体划分为二个规则区域，每个区域上的场由公共界面上的虚设磁流所激发。利用格林函数积分法可求得各场的分布，由相邻区域公共边界场的匹配条件得到场匹配方程，从而求解出腔体谐振频率，并采用微扰法对计算数据予以修正,同时可得到腔体另一重要参数特性阻抗。另外使用HFSS软件仿真腔体，并给出计算、仿真、实测数据比较。