A prototype multi-gap resistive plate chamber （MRPC） with a 2 × 6 gap structure is developed for the upgrading of the endcap time-of-flight （ETOF） detector in the Beijing Spectrometer （BESⅢ ）. The prototyp...A prototype multi-gap resistive plate chamber （MRPC） with a 2 × 6 gap structure is developed for the upgrading of the endcap time-of-flight （ETOF） detector in the Beijing Spectrometer （BESⅢ ）. The prototype MRPC is tested in the E3 beam line of the Beijing Electron Positron Collider （BEPC） with secondary charged particles （π and p, etc） of 600 MeV/c. The test results show that the time resolution of the MRPC can reach 50 ps and that the detection efficiency is greater than 98%.展开更多
The endcap of time-of-flight （ETOF） detector in BES （Beijing Spectrometer） III is planned to be upgraded by using multi-gap resistive plate chambers （MRPCs） and the designed time resolution of the MRPCs is aroun...The endcap of time-of-flight （ETOF） detector in BES （Beijing Spectrometer） III is planned to be upgraded by using multi-gap resistive plate chambers （MRPCs） and the designed time resolution of the MRPCs is around 50 ps. Thus a time-zero （TO） detector needs to be built to offer a high quality reference time for the MRPCs beam test. So a TO detector is built using plastic scintillator tiles （BC420） to couple with four fast phototubes （PMTs, Hamamatsu H6533）. The timing properties of the detector is studied by using a cosmic ray test and factors related to the time resolution, such as plastic scintillator size, readout mode and angle effects, are discussed. TO detector timing resolutions of -41-62 ps are achieved, which means that the TO detector can be used in the MRPC beam test.展开更多
A GEANT4-based Monte-Carlo （MC） model is developed to study the performance of endcap time- of-flight （ETOF） at BESIII. It＇s found that the multiple scattering effects, mainly from the materials at the MDC endcap...A GEANT4-based Monte-Carlo （MC） model is developed to study the performance of endcap time- of-flight （ETOF） at BESIII. It＇s found that the multiple scattering effects, mainly from the materials at the MDC endcap, can cause multi-hit on the ETOF＇s readout cell and significantly influence the timing property of ETOF. A multi-gap resistive plate chamber （MRPC） with a smaller readout cell structure is more suitable for the ETOF detector due to significantly reduced multi-hit rate （per channel）, from 71.5% for currently-used scintillator-based ETOF to 21.8% or 16.7% for MRPC-based ETOF, depending on the readout pad size used. The timing performance of an MRPC ETOF is also improved. These simulation results suggest and guide an ETOF upgrade effort at BESIII.展开更多
基金Supported by National Natural Science Foundation of China (10979003, 10875120)Major State Basic Research Development Program (2008CB817702)
文摘A prototype multi-gap resistive plate chamber （MRPC） with a 2 × 6 gap structure is developed for the upgrading of the endcap time-of-flight （ETOF） detector in the Beijing Spectrometer （BESⅢ ）. The prototype MRPC is tested in the E3 beam line of the Beijing Electron Positron Collider （BEPC） with secondary charged particles （π and p, etc） of 600 MeV/c. The test results show that the time resolution of the MRPC can reach 50 ps and that the detection efficiency is greater than 98%.
基金Supported by State Key program of National Natural Science of China (10979003,10775181,10875140)China PostdoctoralScience Foundation (20090460521)
文摘The endcap of time-of-flight （ETOF） detector in BES （Beijing Spectrometer） III is planned to be upgraded by using multi-gap resistive plate chambers （MRPCs） and the designed time resolution of the MRPCs is around 50 ps. Thus a time-zero （TO） detector needs to be built to offer a high quality reference time for the MRPCs beam test. So a TO detector is built using plastic scintillator tiles （BC420） to couple with four fast phototubes （PMTs, Hamamatsu H6533）. The timing properties of the detector is studied by using a cosmic ray test and factors related to the time resolution, such as plastic scintillator size, readout mode and angle effects, are discussed. TO detector timing resolutions of -41-62 ps are achieved, which means that the TO detector can be used in the MRPC beam test.
基金Supported by National Natural Science Foundation of China(10979003)
文摘A GEANT4-based Monte-Carlo （MC） model is developed to study the performance of endcap time- of-flight （ETOF） at BESIII. It＇s found that the multiple scattering effects, mainly from the materials at the MDC endcap, can cause multi-hit on the ETOF＇s readout cell and significantly influence the timing property of ETOF. A multi-gap resistive plate chamber （MRPC） with a smaller readout cell structure is more suitable for the ETOF detector due to significantly reduced multi-hit rate （per channel）, from 71.5% for currently-used scintillator-based ETOF to 21.8% or 16.7% for MRPC-based ETOF, depending on the readout pad size used. The timing performance of an MRPC ETOF is also improved. These simulation results suggest and guide an ETOF upgrade effort at BESIII.
