EAST

摘要： The Local Monte Carlo(LMC)method is used to solve the problems of deep penetration and long time in the neutronics calculation of the radial neutron camera(RNC)diagnostic system on the experimental advanced superconducting tokamak(EAST),and the radiation distribution of the RNC and the neutron flux at the detector positions of each channel are obtained.Compared with the results calculated by the global variance reduction method,it is shown that the LMC calculation is reliable within the reasonable error range.The calculation process of LMC is analyzed in detail,and the transport process of radiation particles is simulated in two steps.In the first step,an integrated neutronics model considering the complex window environment and a neutron source model based on EAST plasma shape are used to support the calculation.The particle information on the equivalent surface is analyzed to evaluate the rationality of settings of equivalent surface source and boundary.Based on the characteristic that only a local geometric model is needed in the second step,it is shown that the LMC is an advantageous calculation method for the nuclear shielding design of tokamak diagnostic systems.

摘要： The neutron count rate fluctuation reaches six orders of magnitude between the ohmic plasma scenario and high power of auxiliary heating on an experimental advanced superconducting tokamak(EAST).The measurement result of neutron flux monitoring(NFM)is a significant feedback parameter related to the acquisition of radiation protection-related information and rapid fluctuations in neutron emission induced by plasma magnetohydrodynamic activity.Therefore,a wide range and high time resolution are required for the NFM system on EAST.To satisfy these requirements,a digital pulse signal acquisition and processing system with a wide dynamic range and fast response time was developed.The present study was conducted using a field-programmable gate array(FPGA)and peripheral component interconnect extension for instrument express(PXIe)platform.The digital dual measurement modes,which are composed of the pulse-counting mode and AC coupled square integral's Campbelling mode,were designed to expand the measurement range of the signal acquisition and processing system.The time resolution of the signal acquisition and processing system was improved from 10 to 1 ms owing to utilizing highspeed analog-to-digital converters(ADCs),a high-speed PXIe communication with a direct memory access(DMA)mode,and online data preprocessing technology of FPGA.The signal acquisition and processing system was tested experimentally in the EAST radiation field.The test results showed that the time resolution of NFM was improved to 1 ms,and the dynamic range of the neutron counts rate was expanded to more than 10^(6) counts per second.The Campbelling mode was calibrated using a multipoint average linear fitting method;subsequently,the fitting coefficient reached 0.9911.Therefore,the newly developed pulse signal acquisition and processing system ensures that the NFM system meets the requirements of high-parameter experiments conducted on EAST more effectively.

摘要： The Ion Cyclotron Radio Frequency(ICRF)heating antenna on EAST adopts a decoupling device to constrain power coupling among the radiation straps,which was discovered shortcomings such as long size,poor contact,and etc.In order to improve these weak points,a new type decoupler with terminal-loaded tunable capacitor is designed to replace the previous design.Besides the capability of the tunable admittance parameters of decoupler,the withstand voltage of the capacitor is the most significant consideration for working under high power.Therefore,the theoretical analysis carefully elaborates the capacitor withstand voltage,and the detailed analytical equations and criteria for design are given.After the comparative analysis of theoretical calculation and 3D simulation results,the decoupler design scheme is finalized.The capacitor-loaded decoupler has been successfully adopted for ICRF antenna at port N on EAST,and achieved the optimization of adjacent port isolation from-22 to-58 dB at 37 MHz without plasma to restrict mutual coupling.The new design of the decoupler has greatly improved its compactness and automatic adjustment performance,and could be good solution for the decoupling network of ICRF antennas.

摘要： Along with anthropogenic global warming,the Northern Hemisphere(NH)has experienced more frequent cold air out-breaks and heavy snowfalls in recent decades(Petoukhov and Semenov,2010;Liu et al.,2012;Cohen et al.,2014;2020;Overland et al.,2015).The most recent example of extreme winter weather was the extreme cold events that occurred from East Asia to North America during the winter of 2020/21(Cohen et al.,2021;Zheng et al.,2022a).

摘要： The extraordinary mode(X-mode)lower cut-off frequency is proposed for use in the reflectometry diagnostic on ITER for the electron density profile measurement,which is a trade-off between extreme plasma parameters and the accessible probing frequency.In contemporary experiments,the lower cutoff frequency can be identified at the probing frequency below the electron cyclotron frequency(f_(ce)) under certain plasma conditions.We provide here,for the first time,the experimental validation of the use of the lower cut-off frequency for the density profiles via the reflectometry measurement on EAST.The corresponding group delay of the lower cut-off frequency evolves continuously with the upper one,revealing a reasonable radial coverage extension of reflectometry measurement toward the plasma core.It is concluded that the lower cut-off frequency can be used as a supplement to the upper one in the density profile inversion process,which is of particular interest in the high magnetic field and/or density discharge to extend the radial coverage of reflectometry measurement.

摘要： Detachment in helium(He)discharges has been achieved in the EAST superconducting tokamak equipped with an ITER-like tungsten divertor.This paper presents the experimental observations of divertor detachment achieved by increasing the plasma density in He discharges.During density ramp-up,the particle flux shows a clear rollover,while the electron temperature around the outer strike point is decreasing simultaneously.The divertor detachment also exhibits a significant difference from that observed in comparable deuterium(D)discharges.The density threshold of detachment in the He plasma is higher than that in the D plasma for the same heating power,and increases with the heating power.Moreover,detachment assisted with neon(Ne)seeding was also performed in L-and H-mode plasmas,pointing to the direction for reducing the density threshold of detachment in He operation.However,excessive Ne seeding causes confinement degradation during the divertor detachment phase.The precise feedback control of impurity seeding will be performed in EAST to improve the compatibility of core plasma performance with divertor detachment for future high heating power operations.

摘要： Lithium Beam Emission Spectroscopy systems in the outer midplane and divertor Langmuir probe arrays embedded in the divertor target plates,are utilized to investigate the scrape-off layer(SOL)blob transition and its relation with divertor detachment on EAST.The blob transition in the near SOL is observed during the density ramp-up phase.When the plasma density,normalized to the Greenwald density limit,exceeds a threshold of f_(GW)~0.5,the blob size and lifetime increases by 2–3 times,while the blob detection rate decreases by about 2 times.In addition,a weak density shoulder is observed in the near SOL region at the same density threshold.Further analysis indicates that the divertor detachment is highly correlated with the blob transition,and the density threshold of blob transition is consistent with that of the access to the outer divertor detachment.The potential physical mechanisms are discussed.These results could be useful for the understanding of plasma-wall interaction issues in future devices that will operate under a detached divertor and high density conditions(over the blob transition threshold).

摘要： 工程数据监控分析对于全超导托卡马克装置EAST的安全运行分析至关重要,随着工程信号数据规模的增大以及各子系统之间数据多源异构问题的凸显,导致数据孤岛出现,不利于对工程数据进行深入实验分析和装置安全保护。该文根据工程信号的数据特点和实际应用场景,创新性的使用基于超级表结构的列存储模型,通过单采集点单表的形式存储聚变工程数据。使用TDengine和Flink流式处理建立了面向工程信号分析监控的数据仓库,有效地整合工程信号数据并满足聚变实验多维度分析需求,极大地降低存储空间成本和提高检索效率。使用Grafana提供易用灵活的可视化模块和多样的监控报警规则,帮助实验人员对工程信号有更深入的探索分析。

摘要： A team of researchers from China,Germany,France and Spain,has revealed the lifestyle of humans living in East Asia 40,000 years ago.The study was published in Nature on Mar.2nd.The study relies on findings from Xiamabei,a wellpreserved,~40,000-year-old archaeological site in the Nihewan Basin,northern China.It was found and excavated by the Hebei Provincial Institute of Cultural Relics and Archeology(HPICRA)in 2013-2014.

摘要： Nicaragua is located in Central America,bordering Honduras to the north,Costa Rica to the south,the Caribbean Sea to the east and the Pacif ic Ocean to the west,and has a land area of 130,400 square kilometers.

摘要： 本文介绍了EAST 2．45G低杂波前级功率控制系统设计。系统采用工控微机(PC)和ISA总线的采集板(输入和输出)对2．45G低杂波前级功率进行控制，采用程序PID控制算法实现前级功率的反馈控制．操作系统是基于QNX实时操作系统。

摘要： 本文介绍了EAST 2．45G低杂波前级功率控制系统设计。系统采用工控微机(PC)和ISA总线的采集板(输入和输出)对2．45G低杂波前级功率进行控制，采用程序PID控制算法实现前级功率的反馈控制．操作系统是基于QNX实时操作系统。

摘要： 本文介绍了EAST 2．45G低杂波前级功率控制系统设计。系统采用工控微机(PC)和ISA总线的采集板(输入和输出)对2．45G低杂波前级功率进行控制，采用程序PID控制算法实现前级功率的反馈控制．操作系统是基于QNX实时操作系统。

摘要： 本文介绍了EAST 2．45G低杂波前级功率控制系统设计。系统采用工控微机(PC)和ISA总线的采集板(输入和输出)对2．45G低杂波前级功率进行控制，采用程序PID控制算法实现前级功率的反馈控制．操作系统是基于QNX实时操作系统。

摘要： EAST低温系统的自动控制关系到聚变装置实验的成败,本文从控制系统结构、控制策略、软件结构等方面详细阐述了基于集散控制系统的低温控制系统的设计及实现功能,讨论了部分代表性控制回路的控制算法如分程控制、选择性控制、解耦控制.低温控制系统在中科院等离子体物理研究所投入运行后,取得良好效果.该系统对保证EAST正常实验运行具有重大意义,对超低温环境下的过程控制和国内大型制冷设备自动化提出了探讨.

摘要： EAST低温系统的自动控制关系到聚变装置实验的成败,本文从控制系统结构、控制策略、软件结构等方面详细阐述了基于集散控制系统的低温控制系统的设计及实现功能,讨论了部分代表性控制回路的控制算法如分程控制、选择性控制、解耦控制.低温控制系统在中科院等离子体物理研究所投入运行后,取得良好效果.该系统对保证EAST正常实验运行具有重大意义,对超低温环境下的过程控制和国内大型制冷设备自动化提出了探讨.

摘要： EAST低温系统的自动控制关系到聚变装置实验的成败,本文从控制系统结构、控制策略、软件结构等方面详细阐述了基于集散控制系统的低温控制系统的设计及实现功能,讨论了部分代表性控制回路的控制算法如分程控制、选择性控制、解耦控制.低温控制系统在中科院等离子体物理研究所投入运行后,取得良好效果.该系统对保证EAST正常实验运行具有重大意义,对超低温环境下的过程控制和国内大型制冷设备自动化提出了探讨.

摘要： EAST低温系统的自动控制关系到聚变装置实验的成败,本文从控制系统结构、控制策略、软件结构等方面详细阐述了基于集散控制系统的低温控制系统的设计及实现功能,讨论了部分代表性控制回路的控制算法如分程控制、选择性控制、解耦控制.低温控制系统在中科院等离子体物理研究所投入运行后,取得良好效果.该系统对保证EAST正常实验运行具有重大意义,对超低温环境下的过程控制和国内大型制冷设备自动化提出了探讨.

摘要： EAST装配仿真是典型的大型机械装置的装配仿真,规划其复杂几何部件的装配路径需要提供较好的用户界面和三维交互环境.传统的三维交互和用户界面设计已经不适合EAST装配仿真.本文首先简单介绍了大型机械装置EAST的装配特点和系统设计思想,然后提出了高架行车的运动模型、用户界面模型和多三维视景的构造方法.最后通过高架行车拟实控制、多三维视景环境、视景与控制界面相分离的实现创建了自然、高效的EAST仿真用户界面和三维交互环境.

摘要： EAST装配仿真是典型的大型机械装置的装配仿真,规划其复杂几何部件的装配路径需要提供较好的用户界面和三维交互环境.传统的三维交互和用户界面设计已经不适合EAST装配仿真.本文首先简单介绍了大型机械装置EAST的装配特点和系统设计思想,然后提出了高架行车的运动模型、用户界面模型和多三维视景的构造方法.最后通过高架行车拟实控制、多三维视景环境、视景与控制界面相分离的实现创建了自然、高效的EAST仿真用户界面和三维交互环境.

摘要： 基于改进灰色GM(1,1)模型预测的EAST快控电源输出电流预测方法，涉及EAST快控电源技术领域，解决EAST快控电源输出电流的控制精度差的问题；根据EAST快控电源输出电流的原始序列的单调性，将原始序列分为上升阶段序列和下降阶段序列；对于上升阶段序列，建立非等间距的灰色GM(1,1)预测模型，对于下降阶段序列建立等间距的灰色GM(1,1)预测模型，再根据预测模型计算EAST快速控制电源输出电流的预测值，实现对EAST快控电源输出电流的精确快速控制；实现对输出电流实现精准预测，提升了电流跟踪响应速率，提升了等离子体垂直不稳定位移的主动反馈控制效果。

摘要： 本发明属于自然场景文本检测算法技术领域，特别涉及一种EAST算法优化方法，步骤1：图像预处理；步骤2：输入特征提取网络进行特征提取；步骤3：特征融合；步骤4：输入BLSTM网络；步骤5：输出结果；通过优化混合特征金字塔结构，将自上而下的四层合并，改进为只合并前两层，然后再与自上而下路径进行融合。然后利用优化后的混合特征金字塔结构代替原来的EAST算法的特征提取和特征合并结构。解决EAST算法对小感受野文本关注不够，小感受野特征图处理较少不利于后续处理等问题。EAST算法预测误差大大减小，提升EAST算法预测精度。

摘要： 本发明属于核聚变装置制造技术领域，公开了一种EAST下偏滤器钨铜串的超声检测装置及方法，包括控制器、超声波探伤仪、架体、第一运动机构、第二运动机构、探头系统和支撑架；第一运动机构带动探头系统上下运动，第二运动机构带动支撑架旋转；钨铜串设置于支撑架；架体设置有隔板，隔板设置第一通孔，探头系统在第一通孔内上下运动，第一通孔下方设置有旋转组件用于带动支撑架旋转。有益效果：柔性集成式探头系统解决了探头在弯曲的钨铜串内通畅移动和对中难题，通过两轴运动结构和探头导向装置实现了探头从铬锆铜管内部实施的栅格扫查和信号采集，检测方法实现了铬锆铜/铜、铜/钨界面质量的检测，可实现EAST偏滤器的自动化超声检测。

摘要： 本发明公开了一种适用于EAST托卡马克装置光学镜头保护的shutter装置，光学镜头位于光学炮筒最前端并与水平线成45度夹角，shutter装置包括不锈钢圆筒、内侧导轨和不锈钢滑轮、铁质盖板、吸铁石、限位滑轮、直线传动丝杆、固定丝杆、步进电机；内侧导轨和不锈钢滑轮通过插销连接然后安装在不锈钢圆筒内侧；铁质盖板通过插销连接在圆筒前端，可以自由上下转动，圆筒下端固定吸铁石能够提高盖板的密封性；直线传动丝杆一端焊接在圆筒的固定器上，穿过限位滑轮，另一端与固定丝杆之间通过内外螺纹连接；固定丝杆固定在步进电机转轴上，能够驱动直线传动丝杆和不锈钢圆筒做直线运动，从而完成前端盖板打开或者关闭动作，满足光学诊断测量需求并能够保护炮筒前端的光学镜头。

摘要： 本发明公开了一种用于EAST托卡马克射频波导致电子温度演化的模拟方法。在数值模拟射频波注入EAST托卡马克装置后引起的电子温度演化过程时，根据射频系统的硬件参数确定加热源的形式，再根据托卡马克位形下的电子输运方程计算扰动电子温度在给定磁场位形下的演化，根据演化后的电子温度修正等离子体电阻，并采用修正后的电阻计算磁场位形的演化，以此磁场位形继续计算扰动电子温度的演化，反复计算，达到长时间演化的模拟。本发明实现了模拟射频波导致的电子温度在EAST托卡马克真实三维磁场位形下的演化，得到任意时刻的扰动电子温度在三维空间内的分布情况，弥补了实验测量时间精度低的不足，计算效率高，数值稳定性强。

摘要： 本发明公开了一种适应于EAST诊断的多通道数据采集系统及其方法，该系统设置有人机交互主界面，包括了炮号侦听模块、多通道数据采集模块、数据回读模块、状态记录模块；炮号侦听由解析手动发送炮号模块和解析总控系统发送炮号模块构成；多通道数据采集模块由通道集成模块、采集参数配置模块和采集数据绘图模块构成；数据回读模块由回读数据解析模块、回读过程控制模块和回读数据绘图模块构成；状态记录模块由消息显示字符串构成；该系统程序通过合理的控制炮号侦听模块、多通道数据采集模块以及数据回读模块等功能程序，能够实现系统程序的自动化运行。

摘要： 本发明属于核聚变装置制造技术领域，公开了一种EAST下偏滤器钨铜串的超声检测装置及方法，包括控制器、超声波探伤仪、架体、第一运动机构、第二运动机构、探头系统和支撑架；第一运动机构带动探头系统上下运动，第二运动机构带动支撑架旋转；钨铜串设置于支撑架；架体设置有隔板，隔板设置第一通孔，探头系统在第一通孔内上下运动，第一通孔下方设置有旋转组件用于带动支撑架旋转。有益效果：柔性集成式探头系统解决了探头在弯曲的钨铜串内通畅移动和对中难题，通过两轴运动结构和探头导向装置实现了探头从铬锆铜管内部实施的栅格扫查和信号采集，检测方法实现了铬锆铜/铜、铜/钨界面质量的检测，可实现EAST偏滤器的自动化超声检测。

摘要： 本发明公开了一种EAST快控电源输出电流控制方法及装置，所述方法包括：根据EAST快控电源输出电流采样值预测两个周期后的电流值；建立带有约束条件的多目标优化代价函数；利用粒子群算法在线寻求多目标优化代价函数的最优解；将粒子群算法求得的最优解与EAST快控电源的单支路H桥逆变电路输出电压幅值相比得到输出电压系数，输出电压系数与载波幅值相乘得到调制值，调制值再与载波调制比较得到最优的占空比来控制EAST快控电源的单支路H桥逆变电路，使得EAST快控电源输出跟随给定信号的电流值；本发明的优点在于：计算量小，控制精度高。

摘要： 本申请实施例提供一种EAST数据的校验方法、装置、电子设备及存储介质，其中，该方法包括：获取EAST数据和校验结果；根据所述EAST数据获得映射表；构建配置模版；根据所述映射表对所述配置模版进行配置，得到填报清单；对所述填报清单和所述校验结果进行整合，得到校验清单。实施本申请实施例，可以减少EAST数据校验过程中的出错几率，并且可以对出错的数据进行及时修改，避免造成损失。

摘要： 本申请公开了一种EAST下偏滤器线圈电源控制系统及方法，系统包括主控制器和多个脉冲单元，主控制器用于采样EAST总控系统下发的给定电流信号和电源模组的电流值，并进行闭环计算，闭环计算后将脉冲数据分发至多个脉冲单元，脉冲单元用于根据接收到的脉冲数据、周期触发信号、本单元电源模组序号为电源模组产生脉冲串，通过后级驱动器及发送光口传至电源模组；同时接收电源模组通过接收光口、接收器发送的状态信号，并将本单元所驱动的所有电源模组的状态组成状态数据帧上传到主控制器。本申请实现了上级总控系统下发给定电流的快速度跟踪，多个电源模组可同步等差时序运行，且可自由扩展模组个数，简单实现装置扩容。