Investigation of phase modulation and propagation-route effect from unmatched large-scale structures for Doppler reflectometry measurement through 2D full-wave modeling

To interpret the common symmetric peaks caused by the large-scale structure in the complex S(f) spectrum from the heterodyne Doppler reflectometry(DR) measurement in EAST, a 2D circular-shaped O-mode full-wave model based on the finite-difference time-domain method is built. The scattering characteristics and the influences on the DR signal from various scales are investigated. When the structure is located around the cutoff layer, a moving radial or poloidal large-scale structure k_θ■...     

基于PLC的SCADA系统在水厂中的应用

文章通过分析水厂对控制系统的功能要求,介绍了罗克韦尔自动化的基于PLC的SCADA系统和RSView32人机监控组态软件及其基于客户／服务器RSView32活动显示系统在水厂的应用。     

自动控制系统在水厂中的应用

介绍了北京石景山杨庄水厂使用的自动控制系统。系统以美国A－B公司的SLC500及MicroLogix1000可编程控制器、1336Plus变频器和SMCDialogPius软起动控制器为控制器,以DH＋网、RI／0网及无线电台为通讯网络,以RSLogix500、RSView32为组态和监控软件,实现运行多数的遥测、生产过程的远程监控及生产报表的自动管理。     

高炉软融带形状与位置的推断

一、前言高炉软融带在高炉中起着气流分布器的作用,它直接影响煤气的利用率,並对炉料的下降行为有极大影响。因此,实现高炉软融带在线实时推断,掌握操作中高炉软融带的状态,指导操作人员对软融带进行有效的控制和管理,维持一个形状合理、高度适当的软融带,对维持炉况稳定,降低能耗,为转炉炼钢提供稳定的低硅铁水,具有十分重要的意义。     

Comparison of methods for turbulence Doppler frequency shift calculation in Doppler reflectometer

The Doppler reflectometer(DR), a powerful diagnostic for the plasma perpendicular velocity(u⊥) and turbulence measurement, has been widely used in various fusion devices. Many efforts have been put into extracting the Doppler shift from the DR signal. There are several commonly used methods for Doppler shift extraction, such as the phase derivative, the center of gravity, and symmetric fitting(SFIT). However, the strong zero-order reflection component around 0 k Hz may interfere with the calcula...     

Blob properties in I-mode and ELM-free H-mode compared to L-mode on EAST

The blob properties in I-mode and ELM-free H-mode plasmas compared to L-mode have been investigated on the EAST tokamak, including the blob detection rate N_b,size δ_b,lifetime τ_b and radial velocity v_r,b.The blob properties in L-mode and I-mode are similar, and those in ELM-free H-mode are different to them. The blob Nbis smaller while τbis larger in H-mode. The experimental blob sizeδband velocity scalings v_r,b-δ_b show a good agre...     

Optimization of X-mode electron cyclotron current drive in high-electron-temperature plasma in the EAST tokamak

A discharge with electron temperature up to 14 keV has been achieved in EAST. Analysis of the electron cyclotron current drive(ECCD) efficiency at high electron temperature under EAST parameters is presented using C3PO/LUKE code. Simulation results show that the ECCD efficiency of X-mode increases with central electron temperature up to 10 keV and then starts to decrease above 10 keV, at a specific magnetic field and toroidal angle. The efficiency degradation is due to the presence of the third ...