Chinese Physics C > 2016, Vol. 40 > Issue(9): 096101 DOI: 10.1088/1674-1137/40/9/096101

Fast control latency uncertainty elimination for the BESIII ETOF upgrade

Yun Wang^1,2,
Ping Cao^1,2,,,
Shu-bin Liu^1,3,
Qi An^1,2

Abstract
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Abstract：
A new fanning topology is proposed to precisely fan out fast control signals in the Beijing Spectrometer (BESIII) end-cap time-of-flight (ETOF) electronics. However, uncertainty in transfer latency is introduced by the new fanning channel, which will degrade the precision of fast control. In this paper, latency uncertainty elimination for the BESIII ETOF upgrade is introduced. The latency uncertainty is determined by a Time-Digital-Converter (TDC) embedded in a Field-Programmable Gate Array (FPGA) and is eliminated by re-capturing at synchronous and determinate time. Compared with the existing method of Barrel-cap TOF (BTOF), it has advantages of flexible structure, easy calibration and good adaptability. Field tests on the BESIII ETOF system show that this method effectively eliminates transfer latency uncertainty.
- transfer latency uncertainty,
- SerDes,
- BESIII,
- endcap TOF

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Yun Wang, Ping Cao, Shu-bin Liu and Qi An. Fast control latency uncertainty elimination for the BESIII ETOF upgrade[J]. Chinese Physics C, 2016, 40(9): 096101. doi: 10.1088/1674-1137/40/9/096101

Yun Wang, Ping Cao, Shu-bin Liu and Qi An. Fast control latency uncertainty elimination for the BESIII ETOF upgrade[J]. Chinese Physics C, 2016, 40(9): 096101. doi:10.1088/1674-1137/40/9/096101 shu

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Received: 2016-03-24

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Supported by CAS Maintenance Project for Major Scientific and Technological Infrastructure (IHEP-SW-953/2013)

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沈阳化工大学材料科学与工程学院沈阳 110142

Fast control latency uncertainty elimination for the BESIII ETOF upgrade

Corresponding author:Ping Cao,

Received Date:2016-03-24
Available Online:2016-09-05

Fund Project:Supported by CAS Maintenance Project for Major Scientific and Technological Infrastructure (IHEP-SW-953/2013)

Abstract:A new fanning topology is proposed to precisely fan out fast control signals in the Beijing Spectrometer (BESIII) end-cap time-of-flight (ETOF) electronics. However, uncertainty in transfer latency is introduced by the new fanning channel, which will degrade the precision of fast control. In this paper, latency uncertainty elimination for the BESIII ETOF upgrade is introduced. The latency uncertainty is determined by a Time-Digital-Converter (TDC) embedded in a Field-Programmable Gate Array (FPGA) and is eliminated by re-capturing at synchronous and determinate time. Compared with the existing method of Barrel-cap TOF (BTOF), it has advantages of flexible structure, easy calibration and good adaptability. Field tests on the BESIII ETOF system show that this method effectively eliminates transfer latency uncertainty.