清洗放电前MUT托卡马克中的电流分布

本文利用磁探针阵测量清洗放电前ＭＵＴ托卡马克中角向磁场的分布，从而计算得到了等离子体的电流分布。结果表明，在清洗放电初期，由于存在大量杂质，等离子体的横向扩散非常大，因而。真空室的绝缘段几乎不起绝缘作用，此时所测到的环向电流中绝大部分是流经厚壁真空室的电流。     

利用分离变量法求解轴对称平衡态磁场

分离变量法是一种常用的处理轴对称磁场位型的方法.利用分离变量法甚至可以针对较为复杂的磁场位型，例如含有电流源项的磁场位型，得到较为理想的结果.本文介绍了磁场势函数与流函数的正交关系，并利用分离变量法，考虑双电流源的影响，求解了太阳日冕的无力轴对称平衡态磁场的流函数，并绘制了相应的流函数图像，表明了分离变量法求解较复杂的轴对称平衡态磁场的可行性.     

疏松型螺线管电流轴线上磁场的数值计算

应用数值模拟方法，细致地分析了疏松型螺线管电流轴线上的磁场随螺距和轴线上位置的变化关系，计算结果表明，当螺距较大时，其磁场分布与密绕螺线管电流的磁场分布相差很大，磁场沿轴线和垂直于轴线的方向都有分量，螺距越大，垂直于轴线方向的磁场分量越大；但当螺距较小或距螺线管中心较近外，磁场几乎与密切螺线管电流产生的磁场相当，可用表述密绕螺线管电流的轴线上磁场的简单公式来近似。     

HL-3装置电子回旋电流驱动的优化计算

利用托卡马克集成模拟与实验分析平台(OMFIT)开展了HL-3装置ECCD驱动效率的研究，分析了ECCD系统发射天线在等离子体环向与极向所成的角度、等离子体密度、电子温度和磁场对驱动电流大小和位置的影响。研究发现，环向角和极向角范围分别为185°～200°、85°～105°时，ECCD电流驱动效率比较高，驱动电流可以覆盖到归一化半径0.4～0.6。研究还发现，电子温度显著影响ECCD电流驱动效率，温度越高驱动电流越大；在弱场侧磁场强度(1.9～2.2T)越小，驱动电流分布归一化半径越小和驱动电流越大。     

参量调制驱动环形等离子体稳态电流的简化分析

本文用简化模型分析托卡马克装置,建议用等离子体往径向速度振荡和角向磁场振荡的相互作用产生一个定常环向电动势以驱动稳态电流。这可由按一定相位差调制两个外加参量来达到。按反应堆参数估计,这种调制频率可以是工业频率。     

在环形理想导体空腔中极向线电流产生的磁场

本文研究在环形理想导体空腔中极向线电流产生的磁场。在一级环形效应近似下得到的理论结果，基本上与实验数据一致，并且可以推广使用到具有一定类型极向电流分布的情况。     

液晶磁致旋光的研究

利用矩阵方法分析了液晶的旋光效应，导出了液晶旋光的矩阵表示. 利用JG-3型连续可调谐磁场仪搭建实验装置，红外1350 nm激光器做光源，测量了偏振光通过磁场作用下BL-009型向列相液晶的旋光角，详细分析了磁场对液晶旋光性能的影响. 通过实验测试，对液晶的阈值磁场强度进行了讨论，同时对实验结果进行了理论上的分析，得出了液晶旋光角随磁场与液晶盒表面夹角而变化的结论，验证了液晶分子轴的旋转方向与磁场的方向无关，这为更好的研究液晶的特性以及液晶器件的设计具有重要的参考价值. 关键词： 液晶 矩阵 磁致旋光     

一种非轴对称磁绝缘电子鞘层边界的计算方法

长距离磁绝缘传输线内电极偏心、感应腔注入电流非均匀分布引起电子鞘层边界偏心等非对称磁绝缘特性.电子鞘层边界是研究非轴对称磁绝缘特性的重要参数.本文提出一种计算非轴对称磁绝缘电子鞘层边界的方法.通过引入角向非均匀分布的模数,将经典一维轴对称Creedon稳态磁绝缘理论推广应用于圆柱坐标系下二维(r,θ)平面.建立了感应电压叠加器次级非轴对称磁绝缘的二维Creedon物理模型,给出了非轴对称磁绝缘电子鞘层边界的数值计算方法和计算误差.当阴极角向磁场(阴极电流)角向分布满足余弦函数时,电子鞘层边界接近高斯分布.阴极电流角向不均匀程度越大,电子鞘层边界偏心程度越严重,计算误差越大.     

利用高能锂束激光荧光法测量托卡马克中的角向磁场

本文介绍了利用高能锂束激光荧光法测量托卡马克中角向磁场的原理、实验装置和主要技术,同时也介绍了该方法的局限性。     

托卡马克聚变堆中环向磁场超导线圈的磁弹性弯曲与稳定性

本文针对托卡马克装置中超导载流磁体的磁弹性弯曲与稳定性问题，运用Ｂｉｏｔ－Ｓａｖａｒｔ定律和曲梁弯曲理论，给出了其环向磁场的超导载流线圈结构在自身电流产生的磁力作用下的磁弹性力学模型。所得到的控制方程反映了磁场与线圈变形之间的非线性耦合作用，全面描述了结构的轴向拉伸、绕轴扭转、面内弯曲和面外弯曲等各种变形模式。本文采用半解析半数值方法对控制方程进行了定量求解，获得了有关线圈形变和内力分布的定量结果。通过其面外弯曲变形与外加电流的非线性关系，应用Ｓｏｕｔｈｗｅｌ图，给出了线圈在磁弹性相互作用下发生磁弹性失稳的临界电流值，并讨论了临界电流随环向磁场线圈个数变化的规律     

Stability of the flow of weakly electro-conductive fluid in the presence of a spiral magnetic field

The stability to small disturbances of the flow in a pipe of annular cross section is considered in the presence of a spiral magnetic field. The investigated duct configuration consists of two infinite coaxial cylinders between which a weakly electroconductive viscous incompressible fluid is placed, which moves under the axial pressure gradient. The azimuthal magnetic field is created by a current flowing through the central cylinder, and the longitudinal magnetic field is created by an external solenoid. The magnetohydrodynamic approximation is used. It is found that the introduction of the azimuthal magnetic field may lead to a flow destabilization as compared to the case of only the longitudinal magnetic field.     

Effects of helical anisotropy on nonlinear voltage response in amorphous wires

The nonlinear voltage response in soft magnetic amorphous wires exciting by an alternating current is studied. The frequency spectrum of the voltage in the pick-up coil wound around the wire with a helical anisotropy is found in the framework of a model based on quasi-static Stoner−Wohlfarth magnetization reversal. The effect of a deviation of the anisotropy axis from the azimuthal direction on the field dependences of amplitudes of voltage harmonics is analyzed. It is shown that the field sensitivity of even harmonics increases with the anisotropy axis deviation angle. The current amplitude range to obtain a maximal field sensitivity of the second harmonic is found. The influence of the skin effect on the frequency spectrum of the pick-up coil voltage is discussed. The results obtained may be of importance for the development of sensors of a weak magnetic field.     

Measurements of azimuthal drift velocity of ions in a weekly ionized plasma

The azimuthal drift velocity of ions is measured with electrostatic ion wave propagating across the magnetic field. The relation between ion-neutral collision and the drift velocity across the magnetic field is investigated as a function of the magnetic field.     

Eigen electromagnetic waves of a coaxial waveguiding structure filled by a non‐uniform dissipative plasma with azimuthal magnetic field

This paper studies the propagation and spatial attenuation of high‐frequency eigen‐symmetric and dipolar electromagnetic waves along a coaxial plasma–metal waveguiding structure that contains a slightly axial and strong radial non‐uniform cylindrical plasma slab in an external azimuthal non‐uniform magnetic field. The influence of such parameters as the effective electron collision frequency, the direct current value producing the external azimuthal magnetic field, parameters that characterize plasma density radial profile, and waveguide geometric parameters on the dispersion, spatial attenuation, and radial field structure of the waves is considered. The regions of waveguiding structure parameters where the electromagnetic wave properties can be effectively controlled are studied and analyzed.     

带辅助磁场等离子体断路开关的数值模拟

 利用全电磁网格粒子方法模拟了外加磁场对等离子体断路开关（POS）断路性能的影响，给出了电压倍增系数与外加磁场的关系曲线。数值模拟表明，外加轴向磁场线圈必须放在同轴型POS阴极的同侧才能显著改善开关的断路性能；当外加角向磁场时，内电极为阴、阳极的同轴型POS的断路性能都得到了不同程度的改善。随着外加磁场的增大，电压倍增系数将达到饱和。     

A steadily rotating plasma disk

A homogeneously rotating plasma disk can be formed in a radially directed Ar-arc discharge at reduced pressure with an externally applied axial magnetic field. The radial pressure distribution is measured, as well as the emitted continuum radiation and the arc voltage. With these experimental values profiles of temperature, radial and azimuthal current density, and flow velocity in the disk are evaluated. Viscosity determines the flow pattern essentially. The effects of magnetic field and rotational motion on the discharge are investigated. The disk exhibits at nonrigid rotation a strong centrifugal force and a minor Coriolis force. A weak double vortex is found to develop in the meridional plane. The electric field in the discharge is altered by the azimuthal plasma flow.     

Radial distribution of plasma density in the positive column of thehigh-current stationary glow discharge

A model is presented which describes the radial distributions of the plasma density, electric potential, current density, and magnetic field in the positive column of a stationary glow discharge not in contact with the longitudinal walls of the discharge chamber. In this model, the compression of the positive column is provided by the azimuthal magnetic field created by the discharge current. The value of, the discharge current is obtained for the case where charged-particle diffusion is balanced by the actions of the radial electric field and the magnetic pinch effect. The radial distributions of plasma parameters are also calculated for the case of high-current glow discharges where charged-particle diffusion can be ignored     

Propagation of azimuthal waves in magnetoactive waveguides filled with a current-carrying plasma

It is shown that a cylindrical metallic waveguide fully filled with a magnetoactive plasma can propagate coupled ordinarily polarized bulk and extraordinarily polarized surface waves along its azimuthal direction. Interaction between these waves is studied in the case when an external magnetic field has axial and azimuthal components. For the case of a regular profile, a practically convenient analytical expression for a correction to the eigenfrequency of the waves that is due to the external azimuthal magnetic field is derived.     

Wave diffraction by a finite set of azimuthally magnetized ferrite cylinders

The article is devoted to the problem of scattering of plane linear and circular electromagnetic waves by a set of ferrite-coated cylinders. Particular attention is paid to the possibility of controlling the scattering pattern by the azimuthal magnetic field induced in the ferrite by the dc current in metal core of cylinders. It is shown that the best sensitivity can be obtained for the magnetic field, which provides the magnetic resonance inside ferrite layer. Relevant scattering patterns are also presented.     

Structure of the magnetic field of the Jovian magnetosphere

We exactly solved the problem of the interaction between the rotating magnetic field of Jupiter and the equatorial plasma disk formed by the gases flowing from the Jovian satellite Io. The disk is shown to expel the Jovian magnetic field in both directions, inward, toward Jupiter, compressing its dipole magnetic field, and outward. Jupiter spins up the disk up to velocities that correspond to nearly constant angular rotation, but with an angular frequency lower than the angular frequency of Jupiter itself. The radial velocity of the plasma in the disk approaches its azimuthal velocity. We determined the power of Jupiter’s rotational energy losses. Part of this energy is transferred to the disk, and the other part goes into heating the Jovian ionosphere. We show that the Pedersen surface conductivity of the Jovian ionosphere must have a lower limit to maintain the electric current that arises in the disk-rotating magnetic field system. This current in the Jovian magnetosphere flows only along the preferential magnetic surfaces that connect the inner and outer edges of the disk to the ionosphere.