基于System Generator的干扰模块设计

快速实现干扰算法和产生干扰信号是干扰机设计过程中重要的工程问题.基于此提出了基于System Gener-ator的干扰模块设计方法.通过Simulink和System generator搭建干扰算法电路,设计常用干扰样式,在现场可编程门阵列(FPGA)中直接生成电路设计.本设计方法可以快速生成干扰样式的电路,具有易复...     

EAST装置中70m双绞线对信号衰减的研究

为了分析EAST装置电磁测量系统中70m双绞线给测量信号带来的影响,建立了电磁线圈和双绞线的等效电路模型。设计了有双绞线模型和没有双绞线模型的两种电路模型,并对这两种模型在simolorer6.0软件中进行了仿真,通过分析这两种模型的传递函数和仿真输出的电压峰峰值,证明了70m双绞线对EAST中电磁测量系统的影响是可以忽略的。     

Effect of passive plates on vertical instability in the EAST tokamak

The effect of passive plates on vertical displacement control in the EAST tokamak is investigated by open loop experiments and numerical simulations based on a rigid displacement model.The experiments and simulations indicate that the vertical instability growth rate is reduced by a factor of about 2 in the presence of the passive plates,where the adjacent segments are not connected to each other.The simulations also show that the vertical instability growth rate is reduced by a factor of about 10 if all adjacent segments on each passive plate loop are connected to each other.The operational window is greatly enlarged with the passive plates.     

Observation and analysis of halo current in EAST

Plasma in a typically elongated cross-section tokamak （for example, EAST） is inherently unstable against vertical displacement. When plasma loses the vertical position control, it moves downward or upward, leading to disruption, and a large halo current is generated helically in EAST typically in the scrape-off layer. When flowing into the vacuum vessel through in-vessel components, the halo current will give rise to a large J × B force acting on the vessel and the in-vessel components. In EAST VDE experiment, part of the eddy current is measured in halo sensors, due to the large loop voltage. Primary experimental data demonstrate that the halo current first lands on the outer plate and then flows clockwise, and the analysis of the information indicates that the maximum halo current estimated in EAST is about 0.4 times the plasma current and the maximum value of TPF × Ih/Ip0 is 0.65, furthermore Ih/Ipo and TPF × Ih/Ipo tend to increase with the increase of Ip0. The test of the strong gas injection system shows good success in increasing the radiated power, which may be effective in reducing the halo current.     

Effect of passive structure and toroidal rotation on resistive wall mode stability in the EAST tokamak

If βN exceeds no-wallβN, the plasma will be unstable because of external kink and resistive wall mode(RWM). In this article, the effect of the passive structure and the toroidal rotation on the RWM stability in the experimental advanced superconducting tokamak(EAST) are simulated with CHEASE and MARS codes. A model using a one-dimensional(1D)surface to present the effect of the passive plate is proved to be credible. The no wall βN limit is about 3li, and the ideal wall βN limit is about 4.5li on EAST. It is found that the rotation near the q = 2 surface and the plasma edge affects the RWM more.     

磁探针参数的标定

为了标定EAST装置电磁测量系统中的磁探针位置偏差和回路增益,通过分析该装置中的误差源,设计了极向场线圈的通电模式。运用格林函数等算法程序对测量数据进行预处理,利用简化的泰勒线性展开,结合带权重的最小二乘法对数据进行多次循环迭代,拟合出磁探针的位置偏差和回路增益。实验结果表明,使用该方法标定是合理的。     

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为了标定EAST装置电磁测量系统中的磁探针位置偏差和回路增益,通过分析该装置中的误差源,设计了极向场线圈的通电模式。运用格林函数等算法程序对测量数据进行预处理,利用简化的泰勒线性展开,结合带权重的最小二乘法对数据进行多次循环迭代,拟合出磁探针的位置偏差和回路增益。实验结果表明,使用该方法标定是合理的。     

EAST 磁探针 NS 值标定

为了获得精准的磁场测量数据,基于磁探针测量磁场的基本原理,构建了由长螺线管、交流电源、标准探针和数据采集系统组成的长螺线管标定系统,对EAST 磁探针垂直于磁感应强度方向的总有效面积(NS 值) 进行了精确的标定,并对标定数据进行了分析处理。获得的结果符合预期的误差要求,为磁探针精确测量托卡马克中的磁场提供了前提条件。