Trigger design for a gamma ray detector of HIRFL-ETF

DU Zhong-Wei; SU Hong; QIAN Yi; KONG Jie

doi:10.1088/1674-1137/37/10/106101

Chinese Physics C> 2013, Vol. 37> Issue(10) : 106101 DOI: 10.1088/1674-1137/37/10/106101

Trigger design for a gamma ray detector of HIRFL-ETF

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Abstract：
The Gamma Ray Array Detector (GRAD) is one subsystem of HIRFL-ETF (the External Target Facility (ETF) of the Heavy Ion Research Facility in Lanzhou (HIRFL)). It is capable of measuring the energy of gamma-rays with 1024 CsI scintillators in in-beam nuclear experiments. The GRAD trigger should select the valid events and reject the data from the scintillators which are not hit by the gamma-ray. The GRAD trigger has been developed based on the Field Programmable Gate Array (FPGAs) and PXI interface. It makes prompt trigger decisions to select valid events by processing the hit signals from the 1024 CsI scintillators. According to the physical requirements, the GRAD trigger module supplies 12-bit trigger information for the global trigger system of ETF and supplies a trigger signal for data acquisition (DAQ) system of GRAD. In addition, the GRAD trigger generates trigger data that are packed and transmitted to the host computer via PXI bus to be saved for off-line analysis. The trigger processing is implemented in the front-end electronics of GRAD and one FPGA of the GRAD trigger module. The logic of PXI transmission and reconfiguration is implemented in another FPGA of the GRAD trigger module. During the gamma-ray experiments, the GRAD trigger performs reliably and efficiently. The function of GRAD trigger is capable of satisfying the physical requirements.

References

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DU Zhong-Wei, SU Hong, QIAN Yi and KONG Jie. Trigger design for a gamma ray detector of HIRFL-ETF[J]. Chinese Physics C, 2013, 37(10): 106101. doi: 10.1088/1674-1137/37/10/106101

DU Zhong-Wei, SU Hong, QIAN Yi and KONG Jie. Trigger design for a gamma ray detector of HIRFL-ETF[J]. Chinese Physics C, 2013, 37(10): 106101. doi: 10.1088/1674-1137/37/10/106101 shu

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Received: 2012-11-05
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Trigger design for a gamma ray detector of HIRFL-ETF

Corresponding author: DU Zhong-Wei,

Received Date: 2012-11-05
Accepted Date: 1900-01-01
Available Online: 2013-10-05

Abstract: The Gamma Ray Array Detector (GRAD) is one subsystem of HIRFL-ETF (the External Target Facility (ETF) of the Heavy Ion Research Facility in Lanzhou (HIRFL)). It is capable of measuring the energy of gamma-rays with 1024 CsI scintillators in in-beam nuclear experiments. The GRAD trigger should select the valid events and reject the data from the scintillators which are not hit by the gamma-ray. The GRAD trigger has been developed based on the Field Programmable Gate Array (FPGAs) and PXI interface. It makes prompt trigger decisions to select valid events by processing the hit signals from the 1024 CsI scintillators. According to the physical requirements, the GRAD trigger module supplies 12-bit trigger information for the global trigger system of ETF and supplies a trigger signal for data acquisition (DAQ) system of GRAD. In addition, the GRAD trigger generates trigger data that are packed and transmitted to the host computer via PXI bus to be saved for off-line analysis. The trigger processing is implemented in the front-end electronics of GRAD and one FPGA of the GRAD trigger module. The logic of PXI transmission and reconfiguration is implemented in another FPGA of the GRAD trigger module. During the gamma-ray experiments, the GRAD trigger performs reliably and efficiently. The function of GRAD trigger is capable of satisfying the physical requirements.