Matsushita, T.

Paper	Title	Page
WEP091	Upgrade of the Accelerator Radiation Safety System for SPring-8	579
	C. Saji, H. Hanaki, M. Kago, T. Masuda, T. Matsushita, H. Ohkuma, K. Soutome, S. Suzuki, M. Takao, R. Tanaka, M. Toko, H. Yonehara JASRI/SPring-8, Hyogo-ken
	The accelerator safety interlock system to protect persons from radiation hazard induced by electron beams and synchrotron radiation has been operating over a decade in SPring-8. This system is monitoring the safety condition of accelerator components and stops injection electron beams in case of the failure, and stored electron beams are aborted if necessary. SPring-8 complex is composed of five accelerator/beam-transport areas. The injection beam direction can be frequently changed between the two accelerator areas; SPring-8 storage ring and NewSUBARU storage ring. Therefore, the safety interlock system was built introducing the idea of the "operation mode" control system. Once one of the operation modes is selected, the electron beams transport route is defined uniquely. The operation mode control system manages the combination of some accelerator/beam-transport areas. Since the operation mode control system became complicated because the number of "operation mode" has increased according to SPring-8 upgrades, we are planning to construct new safety interlock system. We will report the status of the current safety interlock system and the conceptual design of the new one.
	Poster
WEP096	Design of the Accelerator Safety Interlock System for XFEL in SPring-8	588
	M. Kago, T. Matsushita, N. Nariyama, C. Saji, R. Tanaka JASRI/SPring-8, Hyogo-ken Y. Asano, T. Fukui, T. Itoga RIKEN/SPring-8, Hyogo
	The X-ray Free Electron Laser (XFEL) Facility in SPring-8 is now under construction. The accelerator safety interlock system for the XFEL is required for protecting persons from radiation hazard. The system consists of three interlock systems; a central interlock system (CIS), an emergency interlock system (EIS) and a beam-route interlock system (BIS). The CIS monitors the safety equipment status. The EIS monitors status of emergency stop buttons. The BIS monitors consistency between the predefined electron beam route to the downstream insertion devices and the actual transport route by inputting the current of the bending magnet at the beam switching points. If the condition is unsafe, these systems don't give the permission to the accelerator operation and stops the electron beam. The programmable logic controller (PLC) is basically used to control of each interlock system. It is required to stop the electron beam within 16.6ms because the design maximum repetition frequency of the electron beams is 60Hz. Therefore, we developed the optical module that can transmit high-speed stop signals. We report the present status of accelerator safety interlock system for the XFEL.
	Poster