Resistive Plate Chambers(RPCs) built from a new type of Bakelite developed at Institute of High Energy Physics(IHEP),Chinese Academy of Sciences have been used in the BESⅢ Muon identification system for several years...Resistive Plate Chambers(RPCs) built from a new type of Bakelite developed at Institute of High Energy Physics(IHEP),Chinese Academy of Sciences have been used in the BESⅢ Muon identification system for several years without linseed oil coating,but characteristic aging performances were observed.To adapt to the RPCs in the aging state,the front-end electronics have been upgraded by enhancing the front-end protection,improving the threshold setting circuit,and separating power supplies of the comparator and the field programmable gate array(FPGA).Improvements in system stability,front-end protection and threshold consistency have been achieved.In this paper,the system upgrade and the test results are described in detail.展开更多
文摘Resistive Plate Chambers(RPCs) built from a new type of Bakelite developed at Institute of High Energy Physics(IHEP),Chinese Academy of Sciences have been used in the BESⅢ Muon identification system for several years without linseed oil coating,but characteristic aging performances were observed.To adapt to the RPCs in the aging state,the front-end electronics have been upgraded by enhancing the front-end protection,improving the threshold setting circuit,and separating power supplies of the comparator and the field programmable gate array(FPGA).Improvements in system stability,front-end protection and threshold consistency have been achieved.In this paper,the system upgrade and the test results are described in detail.
