Author: Hamanaka, M.
Paper Title Page
TUPDP050 Development and Test Operation of the Prototype of the New Beam Interlock System for Machine Protection of the RIKEN RI Beam Factory 645
 
  • M. Komiyama, M. Fujimaki, N. Fukunishi, A. Uchiyama
    RIKEN Nishina Center, Wako, Japan
  • M. Hamanaka, K. Kaneko, R. Koyama, M. Nishimura, H. Yamauchi
    SHI Accelerator Service Ltd., Tokyo, Japan
  • A. Kamoshida
    National Instruments Japan Corporation, MInato-ku, Tokyo, Japan
 
  We have been op­er­at­ing the beam in­ter­lock sys­tem (BIS) for ma­chine pro­tec­tion of the RIKEN RI Beam Fac­tory (RIBF) since 2006. It stops beams ap­prox­i­mately 15 ms after re­ceiv­ing an alert sig­nal from the ac­cel­er­a­tor and beam line com­po­nents. We con­tinue to op­er­ate BIS suc­cess­fully; how­ever, we are cur­rently de­vel­op­ing a suc­ces­sor sys­tem to stop a beam within 1 ms con­sid­er­ing that the beam in­ten­sity of RIBF will con­tinue to in­crease in the fu­ture. After com­par­ing mul­ti­ple sys­tems, Com­pactRIO, a prod­uct by Na­tional In­stru­ments, was se­lected for the suc­ces­sor sys­tem. In­ter­lock logic for sig­nal input/out­put is im­ple­mented on the field-pro­gram­ma­ble gate array (FPGA) be­cause fast pro­cess­ing speed is re­quired. On the other hand, sig­nal con­di­tion set­ting and mon­i­tor­ing do not re­quire the same speed as in­ter­lock logic. They are im­ple­mented on the RT-OS and con­trolled by using ex­per­i­men­tal physics and in­dus­trial con­trol sys­tem (EPICS) by set­ting up an EPICS server on the RT-OS. As a first step in de­vel­op­ment, a pro­to­type con­sist­ing of two sta­tions that han­dle only dig­i­tal alert sig­nals was de­vel­oped and in­stalled in part of the RIBF in the sum­mer of 2022 (224 input con­tacts). The sig­nal re­sponse time of the pro­to­type, mea­sured with an os­cil­lo­scope, av­er­aged 0.52 ms with both sta­tions (the dis­tance be­tween two sta­tions is ap­prox­i­mately 75 m). Fur­ther­more, by ad­di­tion­ally in­stalling a pull-up cir­cuit at each sig­nal input con­tact of the sys­tem, the sys­tem re­sponse time was suc­cess­fully re­duced to ap­prox­i­mately 0.13 ms.  
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DOI • reference for this paper ※ doi:10.18429/JACoW-ICALEPCS2023-TUPDP050  
About • Received ※ 03 October 2023 — Revised ※ 09 October 2023 — Accepted ※ 14 December 2023 — Issued ※ 18 December 2023
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