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The Distributing Control System in HT-7 Tokamak

HT-7. ASIPP. The Distributing Control System in HT-7 Tokamak. Zhenshan Ji, J.R.Luo, et al. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 23003l, P.R.China telephone: +86-551-5591375, e-mail:jizh@ipp.ac.cn. Abstract.

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The Distributing Control System in HT-7 Tokamak

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  1. HT-7 ASIPP The Distributing Control System in HT-7 Tokamak Zhenshan Ji, J.R.Luo, et al. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 23003l, P.R.China telephone: +86-551-5591375, e-mail:jizh@ipp.ac.cn

  2. Abstract The Distributing Control System (DCS) has been successfully upgraded on the HT-7 superconducting Tokamak, which includes many subsystems. The basic unit of the DCS is the PC-based industrial application and all the subsystems are equality for the logic position, each subsystem completes the process with its' control task. Using this structure, a complicated task will be divided into many subtasks, which are the parallel running process, and are controlled independently. As the distributing control system, it is comprised with the many subsystems such as programmable control; feedback control; monitor; data acquisition; data saving; real time display and analysis, which are connected by the network with the different computers of the HT-7 tokamak.

  3. The Compose of the DCS in HT-7 • (1)The main control system • (2)The poloidal field control system • (3)The toroidal field control system • (4)The gas injection control system • (5)The synchronous timing system • (6) Remote control system

  4. The Compose of the DCS in HT-7 (2) • (7)The data acquisition systems • (8)Real time display system • (9)Delphi 5.0 for interface with display the raw data in real time • (10) The data searching system is based on WWW, it uses the Internet/Intranet technical and is based on the Browser/Server mode to setup a distributed multi-user system.

  5. Fig. 1 The structure of the DCS in HT-7 Tokamak

  6. The User Interface of the DCS • The user interface for the main control system is a important role for the operators, it should be easy to use. • An example of the interface for the main control system is shown in Fig.2. • The operator can click the button to change the subsystem parameters, just like the poloidal field system, gas injection system, data acquisition system etc in the 30 seconds before the shot.

  7. Fig. 2 The User Interface of the Main Control System

  8. A Graphical User Interface For The Poloidal Field Control • For example when poloidal field button is clicked, the interface of the poloidal field control system will be displayed in a sub-window show in Fig.3: Fig. 3 A Graphical User Interface for the poloidal field control

  9. If the operators want to change the values of the vertical field angle, ohmic heating angle, plasma current, horizontal displacement and vertical displacement, who only just click the relevant button . The advantages of the DCS in HT-7 are as follows: • (1)To monitor the process in a real time during the experiment • (2)To preset the control parameters to the subsystem • (3)To provide an easy to use interface for the experiment operators • (4)To adjust the control parameters by the operators after each shot in real time • (5)To expand easily if there will be the new technology for the system in the future • (6)To transfer the data between the main control system to the each subsystem with the fast Ethernet in order to control the device running in a better case

  10. The Plasma Density Feedback Control Subsystem • The plasma density feedback control subsystem (PDFCS) is composed of many subtasks, such as data acquisition, handling and sending out gas puffing control pulse to adjust the amount of gas injected into the vacuum vessel of the equipment, in real-time. • The previous PDFCS is based on Windows operation system. But it still has some problems we can’t solution, because the problems are brought by the windows platform based on we urgently demand that the PDFCS can provide more real-time control process and more excellent control results. • In such background, we had been upgraded the PDFCS successfully.

  11. Structure Of The Plasma Density Feedback Control Subsystem • The structure of PDFCS is designed to be an Up-Down machine style. • PID Controller Based on Neural Network Adapting Regulation(NNAR) • The Up machine bases on Windows operation system, which can provide excellent man-machine interface that makes parameters setting and data showing in graph and text style very easy. • The Down machine bases on VxWorks real time operation system.

  12. Compare Old PDFCS With New PDFCS

  13. Digitally-Synchronized Timing System • The timing is indispensable both for the control and data acquisition in order to coordinate them to run synchronously on the experiment standard timing. • The synchronization system is based on VXI bus. • There are two typical modules, one is for clock and other is for trigger. • The synchronization system provides master trigger signal to separate data acquisition systems with uniform clocks and trigger times. • Optical fibers are used for the distribution linkage because they provide the good accuracy of the transfer delay and electric isolate. Their structure is showed Fig.1, and their basic specifications are as follows:

  14. Basic Specifications Of Synchronized Timing System • There is a 10 MHz crystal on the modules of trigger and clock. • Signal outputs can preprogrammed • Optical fibers are used for the output linkage • Delay trigger out covers hours-long operations • System flexibility of expansion as VXI modules

  15. Remove Control System • As several different operating systems and collection software are used in the distributed computers of the HT7DAS, each subsystem should be setup respectively if the parameters need to be modified. They are difficult to control and maintain the HT7DAS. • Remote cooperation and communion become more and more important in the fusion experiment. So, it is imperative to develop a central control system for HT7DAS. • Remote control for the parameter of the collection subsystem demands to be realized .

  16. The Principle of the RCS The mixed model of Browser/Server and Client/Server are adopted. Its principle is shown in Fig.4. ASP ,Java and Visual C++ Fig.4 The principle of the RCS

  17. The Structure Of The Data Acquisition Net Fig. 5 The structure of the data acquisition net

  18. Real Time Display and Real Time Data Acquisition System Based on PCI Bus Technology • Conventional data acquisition systems are often called as the batch-processing ones, and usually they apply in short-pulse discharge experiments.As the post-processing procedures after each discharge end, the date acquisition, storage, and visualization have been sequentially executed for the diagnostic raw data produced within digitizers. • In the near future, we should hold the long-pulse experiments whose duration will be up to several minutes, however, such a post-processing mechanism has no effectiveness because people cannot observe any diagnostic data during the discharge continuation. Therefore, the real time data acquisition and simultaneous display will be indispensable for the long pulse experiments.

  19. Real Time Display and Real Time Data Acquisition System Based on PCI Bus Technology • To satisfy requirements, real time display and real time data acquisition system based on PCI bus technology have been developed successfully. • VxWorks real time operation system • C environment, sockets for communications • Easily transportable to other experiments • PCI-PCI bridge transfer rate is 132MB/s

  20. Network Communication System • Two methods of communication have been used in the communication • File sharing • Standard Sockets and Winsock program: the standard Sockets and Winsock, which based on the TCP/IP protocol of the Microsoft in the DCS, program those communications. • These programs are run under different operating system such as windows, Linux, VxWorks ect.

  21. Graphical User Interface For Data Analysis • The display and analysis of the experiment results is carried out by software named GT7(A window-based graphical interfaces software is designed by our institute using the Delphi and Visual c++) • GT7 is not only restricted to the simple display of collected results, but it is also to use in conjunction with data analysis tasks. Fig. 7 A Basic Display for the experiment results

  22. SUMMARY • The Distributing Control System (DCS) of the HT-7 Tokamak has been successfully operated. • The system is being up-graded to new modern hardware which is modular and extensible. • The software architecture contains a user-friendly GUI interface, modern client-server architecture,scalable, parallel real time computations and is primarily written in c(and Delphi for GUI) • Many complex plasma control problems have been solved. • It has proved stable and reliability • All based on the PC technology.

  23. Thanks!

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