Author: Liu, M.
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Design and Prototyping of a New Synchronization System with Stability at Femtoseconds  
  • M. Liu, X.L. Dai, C.X. Yin
    SINAP, Shanghai, People's Republic of China
  We present the design and prototyping of a new synchronization system with high stability. Based on a continuous-wave laser, the RF reference and the timing events are transmitted along the same optical fiber at femtoseconds. Therefore, the system could reutilize the existing fiber optic network of the event timing system around large accelerator facilities. The phase drift of the signal is detected based on Michelson interference and is then compensated with optical methods. The dispersion drift is corrected by appropriative dispersion compensating fiber. The system design and the test results in the lab are demonstrated in the paper.  
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Development and Implementation of the Treatment Control System in Shanghai Proton Therapy Facility  
  • M. Liu, K.C. Chu, C.X. Yin, L.Y. Zhao
    SINAP, Shanghai, People's Republic of China
  Shanghai Proton Therapy Facility is in the phase of commissioning. We developed the treatment control system in consideration of a plurality of IEC standards. The system is comprised of the irradiation control sub-system (ICS) and the treatment interlock sub-system (TIS). The irradiation flow was implemented and monitored by firmware in ICS, with the benefit of low latency. Hardware based TIS conducts the calculation of interlock logics. The protection of patients and the machine from hazards could be guaranteed by TIS with high reliability. ICS is integrated into the main timing system, and ICS controls treatment-related sequence of the accelerator complex via the timing system. The function of switching treatment rooms is realized by hardware in the timing system. The design philosophy, the safety analysis and the design of critical modules are demonstrated in the paper.  
slides icon Slides THCPA05 [2.278 MB]  
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