A gaseous time projection chamber with Micromegas readout for low-radioactive material screening  

作　　者：Haiyan Du Chengbo Du Ke Han Shengming He Liqiang Liu Yue Meng Shaobo Wang Tao Zhang Wenming Zhang Li Zhao Jifang Zhou 

机构地区：[1]Shanghai Laboratory for Particle Physics and Cosmology,Key Laboratory for Particle Astrophysics and Cosmology(MOE),School of Physics and Astronomy,INPAC,Shanghai Jiao Tong University,Shanghai,200240,China [2]Yalong River Hydropower Development Company,Chengdu,610051,China [3]SPEIT(SJTU-ParisTech Elite Institute of Technology),Shanghai Jiao Tong University,Shanghai,200240,China

出　　处：《Radiation Detection Technology and Methods》2023年第1期90-99,共10页辐射探测技术与方法（英文）

基　　金：supported by the grant from the Ministry of Science and Technology of China(No.2016YFA0400302);the grant U1965201 from the National Natural Sciences Foundation of China;We appreciate the support from the Chinese Academy of Sciences Center for Excellence in Particle Physics(CCEPP).

摘　　要：Purpose Low-radioactive material screening is becoming essential for rare event search experiments,such as neutrinoless double beta decay and dark matter searches in underground laboratories.A gaseous time projection chamber(TPC)can be used for such purposes with large active areas and high efficiency.Methods A gaseous TPC with a Micromegas readout plane of approximately 20×20 cm^(2)is successfully constructed for surface alpha contamination measurements.Results We have characterized the energy resolution,gain stability,and tracking capability with calibration sources.Conclusion With the unique track-related background suppression cuts of the gaseous TPC,we have established that the alpha background rate of the TPC is(0.13±0.03)×10^(−6)Bq/cm^(2),comparable to the leading commercial solutions.

关 键 词：Low background Gaseous time projection chamber Background suppression 

分 类 号：O57[理学—粒子物理与原子核物理]