A prototype of the forward tracking array consisting of three multiwire drift chambers（MWDC） for the external target experiment（CEE） at the Heavy Ion Research Facility at the Lanzhou-Cooling Storage Ring（HIRFL-CS...A prototype of the forward tracking array consisting of three multiwire drift chambers（MWDC） for the external target experiment（CEE） at the Heavy Ion Research Facility at the Lanzhou-Cooling Storage Ring（HIRFL-CSR） has been assembled and tested using cosmic rays. The signals from the anode wires are amplified and fed to a Flash-ADC to deliver the drift time and charge integration. The performances of the array prototype are investigated under various high voltages. For the tracking performances, after the space-time relation（STR）calibration and the detector displacement correction, the standard deviation of 223 μm of the residue is obtained.The performances of the forward MWDCs tracking array meets the requirements of CEE in design.展开更多
A Flash-ADC data acquisition （DAQ） system has been developed for the drift chamber array designed for the External-Target-Experiment at the Cooling Storage Ring at the Heavy Ion Research Facility, Lanzhou. The simpl...A Flash-ADC data acquisition （DAQ） system has been developed for the drift chamber array designed for the External-Target-Experiment at the Cooling Storage Ring at the Heavy Ion Research Facility, Lanzhou. The simplified readout electronics system has been developed using the Flash-ADC modules and the whole waveform in the sampling window is obtained, with which the time and energy information can be deduced with an offiine processing. A digital filter algorithm has been developed to discriminate the noise and the useful signal. With the digital filtering process, the signal to noise ratio （SNR） is increased and a better time and energy resolution can be obtained.展开更多
基金Supported by Natural Science Foundation of China(11079025,11375094,U1332207)Tsinghua University Initiative Scientific Research Program
文摘A prototype of the forward tracking array consisting of three multiwire drift chambers（MWDC） for the external target experiment（CEE） at the Heavy Ion Research Facility at the Lanzhou-Cooling Storage Ring（HIRFL-CSR） has been assembled and tested using cosmic rays. The signals from the anode wires are amplified and fed to a Flash-ADC to deliver the drift time and charge integration. The performances of the array prototype are investigated under various high voltages. For the tracking performances, after the space-time relation（STR）calibration and the detector displacement correction, the standard deviation of 223 μm of the residue is obtained.The performances of the forward MWDCs tracking array meets the requirements of CEE in design.
基金Supported by National Basic Research Program of China(973)(2015CB856903 and 2014CB845405)partly by National Science Foundation of China(U1332207 and 11375094)by Tsinghua University Initiative Scientific Research Program
文摘A Flash-ADC data acquisition （DAQ） system has been developed for the drift chamber array designed for the External-Target-Experiment at the Cooling Storage Ring at the Heavy Ion Research Facility, Lanzhou. The simplified readout electronics system has been developed using the Flash-ADC modules and the whole waveform in the sampling window is obtained, with which the time and energy information can be deduced with an offiine processing. A digital filter algorithm has been developed to discriminate the noise and the useful signal. With the digital filtering process, the signal to noise ratio （SNR） is increased and a better time and energy resolution can be obtained.
