Author: Lee, S.
Paper Title Page
WEMMU006 Management Tools for Distributed Control System in KSTAR 694
  • S. Lee, J.S. Hong, J.S. Park, M.K. Park, S.W. Yun
    NFRI, Daejon, Republic of Korea
  The integrated control system of the Korea Superconducting Tokamak Advanced Research (KSTAR) has been developed with distributed control systems based on Experimental Physics and Industrial Control System (EPICS). It has the essential role of remote operation, supervising of tokamak device and conducting of plasma experiments without any interruption. Therefore, the availability of the control system directly impacts on the entire device performance. For the non-interrupted operation of the KSTAR control system, we have developed a tool named as Control System Monitoring (CSM) to monitor the resources of EPICS Input/Output Controller (IOC) servers (utilization of memory, cpu, disk, network, user-defined process and system-defined process), the soundness of storage systems (storage utilization, storage status), the status of network switches using Simple Network Management Protocol (SNMP), the network connection status of every local control sever using Internet Control Message Protocol (ICMP), and the operation environment of the main control room and the computer room (temperature, humidity, water-leak) in real time. When abnormal conditions or faults are detected by the CSM, it alerts abnormal or fault alarms to operators. Especially, if critical fault related to the data storage occurs, the CSM sends the simple messages to operator’s mobile phone. In addition to the CSM, other tools, which are subversion for software version control and vmware for the virtualized IT infrastructure, for managing the integrated control system for KSTAR operation will be introduced.  
slides icon Slides WEMMU006 [0.247 MB]  
poster icon Poster WEMMU006 [5.611 MB]  
Comparative Evaluation of IEEE-1588 Precision Time Protocol for the Synchronized Operation of Tokamak Device  
  • M.K. Park, S. Lee, T.G. Lee, W.R. Lee, S.W. Yun
    NFRI, Daejon, Republic of Korea
  Funding: The Korean Ministry of Education, Science and Technology
Recently the International Thermonuclear Experimental Reactor (ITER), which is the largest project in scale to construct a fusion reactor for the research of fusion energy source jointly with seven participants, has chosen IEEE-1588 precision time protocol (PTP) as a timing system standard for precisely synchronizing tokamak operation and plasma experiments. The IEEE-1588 PTP was designed as a standard for precision clock synchronization protocol for network measurements and control systems, and guarantees higher accuracy (less than sub-microsecond) than using NTP and more economical implementation than using GPS. Besides the original purpose, the uses are expanding to the provision of event timing and synchronization capabilities for large experimental facilities like ITER. On the other hands, many working tokamaks have operated with own timing systems having non-standard protocols. The Korea Superconducting Tokamak Advanced Research (KSTAR) has successfully operated the home-made timing system with the following features; PMC foam-factor with PCI/PCI-X interface, using EPICS 3.14.12 framework, board driver in VxWork5.5.1 and Linux2.6.x platforms, a master clock of 200MHz, timing accuracy less than 50ns, 8 output ports for trigger or clock signals, 8 configurable multi-triggering sections and provision of accurate time referenced to GPS time. This paper describes the result of evaluating IEEE-1588 PTP for tokamak and its detail implementation, and also the comparative analysis with KSTAR timing system after operating them in KSTAR during the 4th campaign in 2011.
poster icon Poster WEPMS012 [3.147 MB]