Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2012, Vol. 23 ›› Issue (6): 361-368 doi: 10.13538/j.1001-8042/nst.23.361-368

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Clock synchronization design and evaluation for trigger-less data acquisition system

SHANG Linfeng; SONG Kezhu; CAO Ping;   

  1. State Key Laboratory of Particle Detection & Electronics,Department of Modern Physics,University of Science and Technology of China; Anhui Key Laboratory of Physical Electronics;
SHANG Linfeng, SONG Kezhu, CAO Ping, . Clock synchronization design and evaluation for trigger-less data acquisition system.Nuclear Science and Techniques, 2012, 23(6): 361-368     doi: 10.13538/j.1001-8042/nst.23.361-368

Abstract:

For modern particle physics experiments,trigger-less data acquisition(DAQ) system has been put into practice because of the need of reaction multiplicity and trigger flexibility.In such new DAQ systems,global synchronized clock plays an important role because it affects the granularity of time slice and precision of reference clock.In this paper,a novel synchronized clock distribution method is proposed.With the help of modulation technique,master clock module distributes system clock to each slave module.To synchronize slave clocks,the propagation delay is adjusted and the clock phase is aligned by an FPGA chip automatically.Furthermore,an ADCbased method is proposed to evaluate the performance of multi-module clock synchronization simultaneously.The experiments of a prototype system show that slave clocks can be synchronized less than 100 ps over 150 m range.The proposed method is simple and flexible,and it can be used in trigger-less DAQ system and other applications of clock distribution preciously.

Key words: Trigger-less DAQ system, Clock distribution, Synchronization, ADC-based evaluation