新型多层厚型气体电子倍增器(Multi-layers THick Gas Electron Multiplier,M-THGEM)和传统THGEM(厚型气体电子倍增器)相比,具有连续的雪崩区,能够在低气压和低电压下都有较高增益,结构更紧凑,易于大面积制作等优势。对M-THGEM探测器的...新型多层厚型气体电子倍增器(Multi-layers THick Gas Electron Multiplier,M-THGEM)和传统THGEM(厚型气体电子倍增器)相比,具有连续的雪崩区,能够在低气压和低电压下都有较高增益,结构更紧凑,易于大面积制作等优势。对M-THGEM探测器的工作原理及性能进行了模拟研究,首先通过有限元(ANSYS)软件对二层与三层结构的M-THGEM进行了建模,对电场和电势分布分别进行了模拟计算;再利用Garfield++程序包对M-THGEM探测器在不同低气压和不同工作电压下的增益、感生信号、正离子反馈率等性能进行了研究。模拟结果表明,三层结构M-THGEM在低气压(200 Torr)、纯He气体条件下,能够获得较稳定的增益(10~5),输出信号的宽度在12 ns左右;同时,为降低正离子反馈率,本工作提出并研究了一种非对称的电压施加方式,结果表明,这种施加方式能有效降低正离子的反馈率。展开更多
Background M-THGEM is a new type of electron multiplier,which is developed with a high gain,good stability and uniformity based on THGEM.With the successful application of small area M-THGEM,the large-area M-THGEM is ...Background M-THGEM is a new type of electron multiplier,which is developed with a high gain,good stability and uniformity based on THGEM.With the successful application of small area M-THGEM,the large-area M-THGEM is proposed based on large-volume gas detector.Purpose The production of large-area M-THGEM is difficult compared with the small one with more holes and more stable instruments.To meet the requirements of large-area gas detectors,the performances of the large-area M-THGEM need to be measured and researched,which will provide a guidance on the process and design of the M-THGEM.Methods The M-THGEM membrane was loaded into a chamber to complete the test under the conditions of 55Fe/X-ray source(5.9 keV)and working gas Ar∶iC4H10=97∶3.The performance of gain,energy resolution,uniformity and long-term stability can be tested.Results Based on the small area M-THGEM,the research and design of large-area M-THGEM with 200×200 mm^(2)were finished.The basic performances were measured.The results show that the gain with the working gas of Ar∶iC_(4)H_(10)=97∶3 can reach to 6×10^(3),and the energy resolution of the^(55)Fe/X-ray source(5.9 keV)reaches 29.4%with a good gain uniformity and stability.Conclusion At present,the production and measurement of the large-area M-THGEM has been finished.The M-THGEM of 200×200 mm^(2)shows a good performance,which will provide many references for the future design.展开更多
文摘新型多层厚型气体电子倍增器(Multi-layers THick Gas Electron Multiplier,M-THGEM)和传统THGEM(厚型气体电子倍增器)相比,具有连续的雪崩区,能够在低气压和低电压下都有较高增益,结构更紧凑,易于大面积制作等优势。对M-THGEM探测器的工作原理及性能进行了模拟研究,首先通过有限元(ANSYS)软件对二层与三层结构的M-THGEM进行了建模,对电场和电势分布分别进行了模拟计算;再利用Garfield++程序包对M-THGEM探测器在不同低气压和不同工作电压下的增益、感生信号、正离子反馈率等性能进行了研究。模拟结果表明,三层结构M-THGEM在低气压(200 Torr)、纯He气体条件下,能够获得较稳定的增益(10~5),输出信号的宽度在12 ns左右;同时,为降低正离子反馈率,本工作提出并研究了一种非对称的电压施加方式,结果表明,这种施加方式能有效降低正离子的反馈率。
基金supported by the National Natural Science Foundation of China under Grant Nos.11975040,11575221,11475013,U1832130the National Key Research and Development Plan No.2016YFA0400400+1 种基金the project of the National Key Laboratory of Nuclear DetectionNuclear Elec-tronics of the Institute of High Energy Physics No.H929420JTD
文摘Background M-THGEM is a new type of electron multiplier,which is developed with a high gain,good stability and uniformity based on THGEM.With the successful application of small area M-THGEM,the large-area M-THGEM is proposed based on large-volume gas detector.Purpose The production of large-area M-THGEM is difficult compared with the small one with more holes and more stable instruments.To meet the requirements of large-area gas detectors,the performances of the large-area M-THGEM need to be measured and researched,which will provide a guidance on the process and design of the M-THGEM.Methods The M-THGEM membrane was loaded into a chamber to complete the test under the conditions of 55Fe/X-ray source(5.9 keV)and working gas Ar∶iC4H10=97∶3.The performance of gain,energy resolution,uniformity and long-term stability can be tested.Results Based on the small area M-THGEM,the research and design of large-area M-THGEM with 200×200 mm^(2)were finished.The basic performances were measured.The results show that the gain with the working gas of Ar∶iC_(4)H_(10)=97∶3 can reach to 6×10^(3),and the energy resolution of the^(55)Fe/X-ray source(5.9 keV)reaches 29.4%with a good gain uniformity and stability.Conclusion At present,the production and measurement of the large-area M-THGEM has been finished.The M-THGEM of 200×200 mm^(2)shows a good performance,which will provide many references for the future design.
