In order to observe gamma rays in the 100 TeV energy region, the 4500 m2 underground muon detector array using water Cherenkov technique is constructed, forming the TIBET Ⅲ＋MD hybrid array. Because the showers induc...In order to observe gamma rays in the 100 TeV energy region, the 4500 m2 underground muon detector array using water Cherenkov technique is constructed, forming the TIBET Ⅲ＋MD hybrid array. Because the showers induced by primary gamma rays contain much fewer muons than those induced by primary hadrons, significant improvement of the gamma ray sensitivity for TIBET Ⅲ＋MD array is expected. In this paper, the design and performance of the MD-A detector with large Tyvek bag is reported.展开更多
The calibration algorithm for RPC-based muon detector at BESIII has been developed. The calibration method, calibration error and algorithm performance are studied. The primary results of efficiency and noise at layer...The calibration algorithm for RPC-based muon detector at BESIII has been developed. The calibration method, calibration error and algorithm performance are studied. The primary results of efficiency and noise at layer, module and strip levels have been calibrated with cosmic ray data. The calibration constants are available for simulation and reconstruction tuning. The results of Monte Carlo and data are also compared to check the validation and reliability of the algorithm.展开更多
Purpose Theγ-ray astronomy at 100 TeV is important to unravel the puzzles related to the origin and acceleration of the Galactic cosmic rays up to PeV energy.The YangBaJing Hybrid Array(YBJ-HA),about 2%the scale of L...Purpose Theγ-ray astronomy at 100 TeV is important to unravel the puzzles related to the origin and acceleration of the Galactic cosmic rays up to PeV energy.The YangBaJing Hybrid Array(YBJ-HA),about 2%the scale of LHAASO-KM2A,is such a kind of detection instrument capable of detecting 100 TeVγ-rays.And the muon detection efficiency stability of the MD array in YBJ-HA is crucial for high qualityγ-ray observation.To measure and monitor the muon detection efficiency,we develop a method in this work.Methods We develop a muon bundle method to measure and monitor the efficiency of each muon detector.In this method,muon detection efficiency of the target MD unit is calculated based on the surrounding MD units and the MC simulation.Results The average actual muon detection efficiency of the 16 MD units is up to 83.4%during 4 years’observation.Conclusions The muon detection efficiency of each MD unit is found to be stable during 4 years’operation.In the future,a similar method may be applicable to the muon detection efficiency study for LHAASO.展开更多
基金Supported by Ministry of Science and Technology of China, National Natural Science Foundation of China (10725524, 11135010,10875132, 11105156)Chinese Academy of Sciences (KJCX2-YW-N13, GJHZ1004, 2A20093111116010)Knowledge Innovation Fund(H85451D1U2) of IHEP, China
文摘In order to observe gamma rays in the 100 TeV energy region, the 4500 m2 underground muon detector array using water Cherenkov technique is constructed, forming the TIBET Ⅲ＋MD hybrid array. Because the showers induced by primary gamma rays contain much fewer muons than those induced by primary hadrons, significant improvement of the gamma ray sensitivity for TIBET Ⅲ＋MD array is expected. In this paper, the design and performance of the MD-A detector with large Tyvek bag is reported.
基金Supported by CAS Knowledge Innovation Project(U-602, U-34)National Natural Science Foundation of China (10491300,10491303, 10605030, 10835001, 10821063)+1 种基金100 Talents Program of CAS (U-25 and U-54)National Basic Research Program of China (2009CB825208)
文摘The calibration algorithm for RPC-based muon detector at BESIII has been developed. The calibration method, calibration error and algorithm performance are studied. The primary results of efficiency and noise at layer, module and strip levels have been calibrated with cosmic ray data. The calibration constants are available for simulation and reconstruction tuning. The results of Monte Carlo and data are also compared to check the validation and reliability of the algorithm.
基金National Natural Science Foundation of China under Grant:11635011,11761141001,11873005,11775233National Key R&D Program of China:2018YFA0404202.
文摘Purpose Theγ-ray astronomy at 100 TeV is important to unravel the puzzles related to the origin and acceleration of the Galactic cosmic rays up to PeV energy.The YangBaJing Hybrid Array(YBJ-HA),about 2%the scale of LHAASO-KM2A,is such a kind of detection instrument capable of detecting 100 TeVγ-rays.And the muon detection efficiency stability of the MD array in YBJ-HA is crucial for high qualityγ-ray observation.To measure and monitor the muon detection efficiency,we develop a method in this work.Methods We develop a muon bundle method to measure and monitor the efficiency of each muon detector.In this method,muon detection efficiency of the target MD unit is calculated based on the surrounding MD units and the MC simulation.Results The average actual muon detection efficiency of the 16 MD units is up to 83.4%during 4 years’observation.Conclusions The muon detection efficiency of each MD unit is found to be stable during 4 years’operation.In the future,a similar method may be applicable to the muon detection efficiency study for LHAASO.
