Author: Nakamura, T.
Paper Title Page
WEPV038 Performance Verification of New Machine Protection System Prototype for RIKEN RI Beam Factory 742
  • M. Komiyama, M. Fujimaki, N. Fukunishi, K. Kumagai, A. Uchiyama
    RIKEN Nishina Center, Wako, Japan
  • M. Hamanaka, T. Nakamura
    SHI Accelerator Service Ltd., Tokyo, Japan
  We report on performance verification of a prototype of a new machine protection system for the RIKEN Radioactive Isotope Beam Factory (RIBF). This prototype was developed to update a beam interlock system (BIS) in operation since 2006. The new system, like the BIS, is configured using a programmable logic controller (PLC). We applied the prototype to a small part of RIBF and started its operation in Sept., 2020. It consists of two separate PLC stations, and there are 28 digital inputs and 23 analog inputs as interlock signals, and 5 digital outputs are used to stop a beam in total. The observed response time averaged 2 ms and 5.7 ms, respectively, within one station and with both stations. When deploying the prototype in the same scale as the BIS, which consists of 5 PLC stations with roughly 400 signals, the response time is estimated to be over 10 ms, which means that it is too long to protect the equipment when the intensity of the beam accelerated at RIBF becomes higher. Therefore, we are starting to redesign a system by adding a field-programmable gate array (FPGA) to shorten the response time significantly rather than repeating minor improvements to save a few milliseconds.  
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About • Received ※ 10 October 2021       Accepted ※ 21 November 2021       Issue date ※ 24 January 2022  
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