Clock auto-synchronization method for BESIII ETOF upgrade*Supported by National Natural Science Foundation of China (10979003, 11005107), CAS Center for Excellence in Particle Physics (CCEPP). (December 2015)

• Record Type: Journal Article
• Authors: Wang 王, Si-Yu 思宇; Cao 曹, Ping 平; Liu 刘, Shu-Bin 树彬; An 安, Qi 琪
• Is Part Of: Chinese physics C. Volume 39:Number 12(2015:Dec.)
• Publication Date: 2015-12
• Subjects: 29.85.Ca; BESIII -- endcap time-of-flight -- clock synchronization; Particles (Nuclear physics) -- Periodicals; Nuclear physics -- Periodicals; 539.76
• DOI: 10.1088/1674-1137/39/12/126102
• Languages: English
• ISSNs: 1674-1137

Abstract

Abstract: An automatic clock synchronization method implemented in a field programmable gate array (FPGA) is proposed in this paper. It is developed for the clock system which will be applied in the end-cap time of flight (ETOF) upgrade of the Beijing Spectrometer (BESIII). In this design, an FPGA is used to automatically monitor the synchronization circuit and deal with signals coming from the external clock synchronization circuit. By testing different delay time of the detection signal and analyzing the signal state returned, the synchronization windows can be found automatically by the FPGA. The new clock system not only retains low clock jitter which is less than 20ps root mean square (RMS), but also demonstrates automatic synchronization to the beam bunches. So far, the clock auto-synchronizing function has been working successfully under a series of tests. It will greatly simplify the system initialization and maintenance in the future.