Development of Dα band symmetrical visible optical diagnostic for boundary reconstruction on EAST tokamak

To investigate the potential of utilizing visible spectral imaging for controlling the plasma boundary shape during stable operation of plasma in future tokamak, a D_α band symmetric visible light diagnostic system was designed and implemented on the Experimental Advanced Superconducting Tokamak(EAST). This system leverages two symmetric optics for joint plasma imaging. The optical system exhibits a spatial resolution less than 2 mm at the poloidal cross-section, distortion within the ...     

EAST全超导托卡马克等离子体击穿模拟

托卡马克装置的等离子体击穿有两个关键因素：合适的环电压和真空区域尽可能大的零场区。极向场线圈电流放电引起真空室感应涡流的产生,感应涡流对零场的优化、环电压的建立都有着不容忽视的影响。文章在对EAST真空室简化和划分的基础上,求解出真空室上感应涡流在等离子体击穿阶段的分布,对环电压的建立和零场区的变化情况进行了有效模拟。     

Upgrade of the Distributed Time-Keeping and Synchronization System for EAST

The distributed time-keeping and synchronization system(DTSS)underwent an upgrade for EAST during the last shutdown.The upgraded DTSS,designed based on PXI bus and reconfigurable I/O devices,synchronizes all other sub-systems by using a reference clock and trigger.It can produce a uniform clock up to 80 MHz,provide a delayed trigger from 1 ms to6872 s in 1 ms steps with 10 ns accuracy,and acquire the outputs of itself for self-inspection.The new DTSS was successfully applied in the 2012 spring EAST campaign,and has proven to be stable and reliable,giving an effective performance.The system structure and software development will be illustrated in detail in this paper.     

EAST分布式定时同步系统的实现

分布式定时同步系统在国家大科学工程EAST中有重要作用,它用于同步EAST各子系统精准投入实验的时序。分布式定时同步系统利用PXI工业级设备并结合虚拟仪器技术实现定时同步系统,可提供1 Hz～80 MHz频率的参考时钟信号,产生1 ms～6 872 s延迟触发信号（精度达10 ns）。该系统能采集信号,并能根据检测的信号实时触发相应处理机制。分布式定时同步系统精度高且运行稳定可靠,已成功应用于2010年秋季EAST放电实验。     

低能离子辐照苏氨酸质量沉积方式的研究

通过研究加入和不加入自由基清除剂条件下，３０ｋｅＶ Ｎ＾＋辐照苏氨酸的剂量与氨基浓度的变化，提出入射的Ｎ＾＋是以氨基的形式沉积在样品分子中，定性和定量解释了低能离子辐射的剂量与氨基残存率的关系。加入自由基清除剂后剂量效应的变化分析结果表明，一部分入射离子是通过自由基反应方程历程沉积在样品分子中。     

基于肤色信息马氏距离图的人脸检测

提出了一种基于肤色信息的人脸检测方法。构造了皮肤颜色模型、检测图像的皮肤区域,并计算出该区域相对于皮肤的马氏距离图。根据马氏距离图寻找特征脸子空间,构造出BP神经网络。以马氏距离图在各特征脸子空间的投影系数为BP神经网络的输入,计算该区域是否为人脸图像。实验证明,该方法是有效的。     

Vertical Instability in EAST： Comparison of Model Predictions with Experimental Results

Growth rates of the axisymmetric mode in elongated plasmas in the experimental advanced superconducting tokamak （EAST） are measured with zero feedback gains and then compared with numerically calculated growth rates for the reconstructed shapes. The comparison is made after loss of vertical position control. The open-loop growth rates were scanned with the number of vessel eigenmodes, which up to 20 is enough to make the growth rates settled. The agreement between the growth rates measured experimentally and the growth rates determined numerically is good. The results show that a linear RZIP model is essentially good enough for the vertical position feedback control.     

Algorithm Validation of the Current Profile Reconstruction of EAST Based on Polarimeter/Interferometer

The method of plasma current profile reconstruction using the polarimeter/interferometer(POINT) data from a simulated equilibrium is explored and validated.It is shown that the safety factor(q) profile can be generally reconstructed from the external magnetic and POINT data.The reconstructed q profile is found to reasonably agree with the initial equilibriums.Comparisons of reconstructed q and density profiles using the magnetic data and the POINT data with 3%,5%and 10%random errors are investigated.The result shows that the POINT data could be used to a reasonably accurate determination of the q profile.     

EAST长脉冲放电实验实时数据系统

EAST装置的等离子体放电持续时间设计值是1 000 s,针对该特性,为满足EAST装置长脉冲放电实验的需要,设计并实现具有实时数据存储和发布的长脉冲放电实验数据系统。介绍长脉冲数据实时存储体系,实现分片存储的设计方法,并给出系统测试结果。实验结果表明,该系统工作稳定、性能高,在聚变领域有重要的应用价值。     

基于MDSplus的EAST工程数据获取及显示

EAST聚变放电实验需要同步显示电磁测量诊断数据和各个工程装置运行状态的实验数据,以前的系统只是单纯的显示工程装置运行状态数据,并不能显示放电期间工程装置运行状态的实验数据变化波形。基于MDSplus设计和实现了EAST工程实验数据在线获取及可视化分析显示系统。系统已应用于2009年的EAST春季实验。实验结果表明,系统设计方案合理、运行稳定,具有很好的应用前景。