Design of Timing System Software on EAST–NBI

Neutral Beam Injector (NBI) is one of the main plasma heating and plasma current driving methods for Experimental Advanced Superconducting Tokomaks. In order to monitor the NBI experiment, control all the power supply, realize data acquisition and network, the control system is designed. As an important part of NBI control system, timing system (TS) provides a unified clock for all subsystems of NBI. TS controls the input/output services of digital signals and analog signals. It sends feedback message to the control server which is the function of alarm and interlock protection. The TS software runs on a Windows system and uses Labview language code while using client/server mode, multithreading and cyclic redundancy check technology. The experimental results have proved that TS provides a stability and reliability clock to the subsystems of NBI and contributed to the safety of the whole NBI system.     

The Development of Data Acquisition and Remote Real-Time Display System for EAST NBI

The data acquisition and remote real-time display system for the neutral beam injectors (NBI) on experimental advanced superconducting tokamak (EAST) are described in this paper. Distributed computer systems including local data acquisition (DAQ) facility, remote data server (DS), real-time display terminal are adopted with Linux and Windows operating system. Experimental signals are gathered by DAQ device at local working field. On the one hand, these gathered data will be sent to DS which runs on remote server main control layer on EAST NBI control network for saving and processing; on the other hand, these data will be sent to real-time display terminal which runs on remote monitoring layer on EAST NBI for displaying and monitoring experimental signals real-timely. Another point needs to be mentioned is that the real-time display software can call back historical data from DS for querying. The software of data acquisition and DS are programmed by C language while the real-time display software is programmed by Labview flow chart. The hardware mainly includes DAQ cards, server, industrial personal computer and others auxiliary hardware. Now the system proved to be performed well through experiments on NBI testing bed.     

Data Server Application Software for Neutral Beam Injection Control System

The neutral beam injection (NBI) heating is one of the mainly auxiliary plasma heating methods for EAST. In this paper, a data server application software is presented for NBI control system. This application software is developed on Centos OS by C programming language with TCP and multithreading technology. It mainly focuses on storing and querying experimental pulse data and engineering data; experimental user’s operation records; experimental configuration information; the collected data after processing; as well as managing and releasing experimental discharge shot number and so on. By using the unified data header structure, the data server software provides universal information exchange interfaces for different service request terminals with different operating platform, such as WinCC, Labview. With the help of data server software, those problems related on the storage, querying and processing of information and data for NBI control system are well solved.     

基于CSS的NBI射频离子源控制程序设计

离子源是中性束注入器(Neutral Beam Injector,NBI)的关键子系统之一,根据射频离子源的实验和运行需求,本文设计了一套基于物理实验与工业控制系统(Experimental Physics and Industrial Control System,EPICS)架构的控制程序,实现对射频离子源实验和调试过程的远程监控功能。NBI射频离子源控制程序通过集成开发平台(Control System Studio,CSS)的交互界面开发模块(Best OPI Yet,BOY)实现友好的人机交互界面,使用Jython实现界面逻辑,支持服务器/客户端和EPICS两种通信架构。程序已经上线近半年,实验表明,射频离子源控制程序具备了放电模式设置、时序幅值设置、设备状态实时监控、采集数据实时波形显示等功能,满足了射频离子源实验的远程控制和数据可视化的需求。     

Design of Waveform Generator for NBI in EAST

The control system of neutral beam injector (NBI) monitors the status of NBI equipments, controls all of the power supply, realizes data acquisition and network, and provides a unified clock for all subsystems of NBI system. As an important part of NBI control system, waveform generator (WG) monitors the parameters of the experiment and displays these parameters in the waveform terminal. The WG software also can send simple experiment commands and make it easy for experiment test. The WG software develops under Windows operating system, using labview language. The design is related to many kinds of technologies, such as client/server communication, multithreading and cyclic redundancy check technology, TCP protocol and so on.     

Development of Data Processing Software for NBI Spectroscopic Analysis System

A set of data processing software is presented in this paper for processing NBI spectroscopic data.For better and more scientific managment and querying these data,they are managed uniformly by the NBI data server.The data processing software offers the functions of uploading beam spectral original and analytic data to the data server manually and automatically,querying and downloading all the NBI data,as well as dealing with local LZO data.The set software is composed of a server program and a client program.The server software is programmed in C/C++under a CentOS development environment.The client software is developed under a VC6.0 platform,which offers convenient operational human interfaces.The network communications between the server and the client are based on TCP.With the help of this set software,the NBI spectroscopic analysis system realizes the unattended automatic operation,and the clear interface also makes it much more convenient to offer beam intensity distribution data and beam power data to operators for operation decision-making.     

Design of Experimental Data Publishing Software for Neutral Beam Injector on EAST

Neutral Beam Injection(NBI) is one of the most effective means for plasma heating.Experimental Data Publishing Software(EDPS) is developed to publish experimental data to get the NBI system under remote monitoring.In this paper,the architecture and implementation of EDPS including the design of the communication module and web page display module are presented.EDPS is developed based on the Browser/Server(B/S) model,and works under the Linux operating system.Using the data source and communication mechanism of the NBI Control System(NBICS),EDPS publishes experimental data on the Internet.     

Development of Distributed Control System for Neutral Beam Injector on EAST

A distributed control system of Neutral Beam Injector(NBI) on the Experimental Advanced Superconducting Tokamak(EAST-NBI) is briefly presented in this paper.The control system is developed in accordance with the experimental operational characteristics of the EASTNBI.The NBI control system(NBICS),which is based on the computer network technologies and classified according to the control levels,consists of three levels:a remote monitoring layer,a server control layer,and a field control layer.The 3-layer architecture is capable of extending the system functions and upgrading devices.The timing system provides the reference clock of the synchronization and interlock for the EAST-NBI system.An interlock system ensures the safety of the experiment operators and field devices.Both of the ion sources of the beamline are designed to operate independently.This lays an important foundation for developing a control system for the second beamline on EAST.Experimental results demonstrate that the NBICS meets functional requirements of the EAST-NBI control,and makes experimental operations visual and automatic.     

Data Acquisition System of Neutral Beam Injector on EAST

In order to supervise the elements of the neutral beam injector (NBI) spatially located at several places, a distributed NBI data acquisition system (NBIDAS) on experimental advanced superconducting tokamak (EAST) is developed in this paper. NBIDAS consists of field instrument and measurement devices, servers and remote data processing terminals. In order to remotely manage and monitor the field devices of the NBI system, a device management client software is also developed as the human–machine interfaces between the field devices and remote system administrators. A control signal acquisition system is developed for diagnosing these generated analog and digital signals from the NBI control system. NBIDAS based on network technologies is capable of extending system functions and upgrading devices. The detail of the architecture and implementation of the NBIDAS on EAST is discussed in the paper.     

Design and Application of Experimental Configuration Query Software for EAST NBI

To verify the rationality of experimental configurations before each experiment discharge of Experimental Advanced Superconducting Tokamak (EAST) Neutral Beam Injection (NBI) and to query the experimental configurations under historical shot numbers, an experimental configuration query terminal is needed during NBI experiments. In this paper, the experimental configuration query software is presented which is realized with multithreading technology, TCP protocol, Mysql database and so on. Multithreading technology achieves that different service requests can be dealt by different threads for improving the processing efficiency of the program. TCP protocol ensures reliable network communication between the server and the client. The configurations set by experimental operators are saved to Mysql database of the server with different data tables. The server works under Linux operating system while the client works on Windows operating system. With the help of this application, the current and historical experimental configurations are displayed and queried, thus on the one hand, the current experimental configurations especially the settings of timing sequence and amplitude for NBI each power supply system are verified before each NBI discharge; on the other hand, the typical history configurations can be queried for experimental reproducibility. This application is very practical significance for EAST NBI experiments.     

Design and development of a synchronized operation control system for Thomson scattering diagnostic on J-TEXT

A Thomson scattering diagnostic system is under construction at the Joint Texas Experimental Tokamak (J-TEXT).A 1064 nm Nd:YAG laser with 50 Hz repetition rate is used as the laser source.We have used a software for careful and precise control of the laser through serial communication.A time sequence operating system has been developed to synchronize the laser control and data acquisition system with the central control system (CSS).The system operates commands from the CSS of J-TEXT and generates triggers for the laser and data acquisition system in the proper sequence.It also measures an asynchronous time value that is needed for accurate time stamping.All functions are served by a field-programmable gate array development platform that is suitable for high-speed data and signal processing applications.Several embedded peripherals,including Ethernet and USB 2.0,provide communication with the CSS and the server.     

上海光源数字化束流位置信号处理器测试平台研制

数字化束流位置信号处理器(Digital Beam Position Monitor Processor,DBPM)是上海光源自主研发作为束流位置监测(Beam Position Monitor,BPM)的主要设备。针对DBPM电子学处理器产品化测试需求开发了一套基于MATLAB和程控技术的自动化测试平台,用于处理器批量测试验收和性能评估。平台使用Agilent MXG信号源和一分四功分器模拟4路真实探头信号,经过处理器采集处理后被上位机接收。测试仪器的设置和实验数据的获取,整个系统是基于客户端和服务器架构实现的。采用物理实验与工业控制系统(Experimental Physics and Industrial Control System,EPICS)的通道访问Lab CA接口实现数据的实时采集。目前该测试平台已经成功应用于大连自由电子激光装置和上海软X射线自由电子激光装置的DBPM处理器验收测试,处理器幅频响应曲线,不同衰减下模数变换器(Analog to Digital Converter,ADC)噪声水平测试、衰减步长一致性、通道间串扰及信噪比测试结果均达到设计指标。     

Design and implementation of data acquisition system for magnets of SST-1

The magnet system of the Steady-State Superconducting Tokamak-1 at the Institute for Plasma Research, Gandhinagar, India, consists of sixteen toroidal field and nine poloidal field. Superconducting coils together with a pair of resistive PF coils, an air core ohmic transformer and a pair of vertical field coils. These magnets are instrumented with various cryogenic compatible sensors and voltage taps for its monitoring, operation, protection, and control during different machine operational scenarios like cryogenic cool down, current charging cycles including ramp up, flat top, plasma breakdown, dumping/ramp down and warm up. The data acquisition system for these magnet instrumentation have stringent requirement regarding operational flexibility, reliability for continuous long term operation and data visualization during operations. A VME hardware based data acquisition system with ethernet based remote system architecture is implemented for data acquisition and control of the complete magnet operation. Software application is developed in three parts namely an embedded VME target, a network server and a remote client applications. A target board application implemented with real time operating system takes care of hardware configuration and raw data transmission to server application. A java server application manages several activities mainly multiple client communication over ethernet, database interface and data storage. A java based platform independent desktop client application is developed for online and offline data visualization, remote hard ware configuration and many other user interface tasks. The application has two modes of operation to cater to different needs of cool-down and charging operations. This paper describes application architecture, installation and commissioning and operational experience from the recent campaigns of SST-1.     

Design of Timing Synchronization Software on EAST-NBI

To ensure the uniqueness and recognition of data and make it easy to analyze and process the data of all subsystems of the neutral beam injector （NBI）, it is required that all subsystems have a unified system time. In this paper, the timing synchronization software is presented which is related to many kinds of technologies, such as shared memory, multithreading, TCP protocol and so on. Shared memory helps the server save the information of clients and system time, multithreading can deal with different clients with different threads, the server works under Linux operating system, the client works under Linux operating system and Windows operating system. With the help of this design, synchronization of all subsystems can be achieved in less than one second, and this accuracy is enough for the NBI system and the reliability of data is thus ensured.     

Application Software of Main Control Server for Neutral Beam Injection Control System

As the center of neutral beam injector (NBI) control system, main control server controls the whole NBI system’s input and output services, and it verifies whether the experimental parameters are reasonable, stores the real-time data, monitors the statuses of the experimental equipments in real time and makes it easy to perform self-protection and alarm automatically. In order to realize these functions, MYSQL technology, client/server communication mode, multithreading and cyclic redundancy check technology are used in this paper.     

ITER Fast Plant System Controller prototype based on PXIe platform

The ITER Fast Plant System Controller (FPSC) is based on embedded technologies. The FPSC will be devoted to both data acquisition tasks (sampling rates higher than 1 kHz) and control purposes (feedback loop actuators). Some of the essential requirements of these systems are: (a) data acquisition and data preprocessing; (b) interfacing with different networks and high speed links (Plant Operation Network, timing network based on IEEE1588, synchronous data transference and streaming/archiving networks); and (c) system setup and operation using EPICS (Experimental Physics and Industrial Control System) process variables.CIEMAT and UPM have implemented a prototype of FPSC using a PXIe (PCI eXtension for Instrumentation) form factor in a R&D project developed in two phases. The paper presents the main features of the two prototypes developed that have been named alpha and beta. The former was implemented using LabVIEW development tools as it was focused on modeling the FPSC software modules, using the graphical features of LabVIEW applications, and measuring the basic performance in the system. The alpha version prototype implements data acquisition with time-stamping, EPICS monitoring using waveform process variables (PVs), and archiving. The beta version prototype is a complete IOC implemented using EPICS with different software functional blocks. These functional blocks are integrated and managed using an ASYN driver solution and provide the basic functionalities required by ITER FPSC such as data acquisition, data archiving, data pre-processing (using both CPU and GPU) and streaming.     

A user configurable data acquisition and signal processing system for high-rate,high channel count applications

Real-time signal processing in plasma fusion experiments is required for control and for data reduction as plasma pulse times grow longer. The development time and cost for these high-rate, multichannel signal processing systems can be significant. This paper proposes a new digital signal processing (DSP) platform for the data acquisition system that will allow users to easily customize real-time signal processing systems to meet their individual requirements.The D-TACQ reconfigurable user in-line DSP (DRUID) system carries out the signal processing tasks in hardware co-processors (CPs) implemented in an FPGA, with an embedded microprocessor (μP) for control. In the fully developed platform, users will be able to choose co-processors from a library and configure programmable parameters through the μP to meet their requirements.The DRUID system is implemented on a Spartan 6 FPGA, on the new rear transition module (RTM-T), a field upgrade to existing D-TACQ digitizers.As proof of concept, a multiply-accumulate (MAC) co-processor has been developed, which can be configured as a digital chopper-integrator for long pulse magnetic fusion devices. The DRUID platform allows users to set options for the integrator, such as the number of masking samples. Results from the digital integrator are presented for a data acquisition system with 96 channels simultaneously acquiring data at 500 kSamples/s per channel.     

SSRF数字化电源巡检系统的设计

开发了SSRF数字电源巡检系统,实现远程巡检与本地巡检两种模式,采用LabVIEW软件开发平台设计了简单美观的用户界面,两种硬件结构在数字化电源巡检用户软件界面上不需修改.远程巡检用于模拟数字化电源与中央控制室间远程监控通讯的调试,及时排查远程通讯或电源的故障;本地巡检可同时检测18台数字化电源,长期(24 h)进行故障状态监视,并通过Excel或text记录与保存,进行电源性能指标验收.两种巡检模式已用于SSRF的数字化电源巡检.     

北京同步辐射生物大分子光束线监测系统

介绍了基于LabVIEW开发的BSRF(北京同步辐射装置)生物大分子光束线监测系统。该系统对光束线真空、冷却水、光学元件姿态、光束状态、液氮状态进行实时监控,及时发现故障并给出报警,以保障光束线设备安全、稳定、可靠地运行。系统底层利用对现场设备开发的驱动程序进行数据采集,采集的数据上传至数据共享平台使之可以通过网络共享。系统上层按照实际功能划分模块,建立光束线总监测界面。通过LabSQL工具包实现系统与MySQL数据库互连,将采集数据传至数据库,方便对数据进行存储、管理和查询。     

Development and Integration of a Data Acquisition System for SST-1 Phase-1 Plasma Diagnostics

Long pulse(of the order of 1000 s or more) SST-1 tokamak experiments demand a data acquisition system that is capable of acquiring data from various diagnostics channels without losing useful data(and hence physics information) while avoiding unnecessary generation of a large volume data.SST-1 Phase-1 tokamak operation has been envisaged with data acquisition of several essential diagnostics channels.These channels demand data acquisition at a sampling rate ranging from 1 kilo samples per second(KSPS) to 1 mega samples per second(MSPS).Considering the technical characteristics and requirements of the diagnostics,a data acquisition system based on PXI and CAMAC has been developed for SST-1 plasma diagnostics.Both these data acquisition systems are scalable.Present data acquisition needs involving slow plasma diagnostics are catered by the PXI based data acquisition system.On the other hand,CAMAC data acquisition hardware meets all requirements of the SST-1 Phase-1 fast plasma diagnostics channels.A graphical user interface for both data acquisition systems(PXI and CAMAC) has been developed using LabVIEW application development software.The collected data on the local hard disk are directly streaming to the central server through a dedicated network for post-shot data analysis.This paper describes the development and integration of the data acquisition system for SST-1 Phase-1 plasma diagnostics.The integrated testing of the developed data acquisition system has been performed using SST-1 central control and diagnostics signal conditioning units.In the absence of plasma shots,the integrated testing of the data acquisition system for the initial diagnostics of SST-1 Phase-1 operation has been performed with simulated physical signals.The primary engineering objective of this integrated testing is to validate the performance of the developed data acquisition system under simulated conditions close to that of actual tokamak operation.The data acquisition is synchronized with a clock and trigger provided by the central timing system.