本文采用了自主研发的THGEM探测器,其具有双膜结构,64路直流读出电子学等特点。采用该THGEM探测器在K荧光装置上,开展了对15~70 ke V内多能量点X射线的探测实验工作;结果显示该THGEM探测器对宽能区、高注量(剂量当量)的X射线具有良好线...本文采用了自主研发的THGEM探测器,其具有双膜结构,64路直流读出电子学等特点。采用该THGEM探测器在K荧光装置上,开展了对15~70 ke V内多能量点X射线的探测实验工作;结果显示该THGEM探测器对宽能区、高注量(剂量当量)的X射线具有良好线性响应,并分析了影响探测效率的因素。展开更多
In cases of high radiation emergencies,we propose a surface contamination monitor(SCM)that can quickly measure and pinpoint the contamination distribution in the affected population.Thick gaseous electron multiplier(T...In cases of high radiation emergencies,we propose a surface contamination monitor(SCM)that can quickly measure and pinpoint the contamination distribution in the affected population.Thick gaseous electron multiplier(THGEM)has several advantages,including fast response time and good spatial resolution.Based on new THGEMs,a two-dimensional imaging detector was developed for alpha detection,with a position resolution greater than 3 mm.The detector design and test results are described in this paper.Fast radiation imaging SCMs,with a 40mm×40 mm sensitive area,are currently under development.展开更多
Thick gas electron multipliers (THGEMs) are new types of gas detectors with merits such as a high counting rate,anti-radiation,high gain,robustness and relatively low cost.We establish an up-down THGEM detector hodosc...Thick gas electron multipliers (THGEMs) are new types of gas detectors with merits such as a high counting rate,anti-radiation,high gain,robustness and relatively low cost.We establish an up-down THGEM detector hodoscope system for detecting and displaying muon tracks.Muon tracks can be well observed with the detectors and the present study lays an important technological foundation for the domestic and mass production of THGEMs.展开更多
A double thick GEM (THGEM) detector with thin THGEM foils and small holes was constructed. In order to optimize the operation parameters of the detector, a simulation study of the detector was carried out using ANSYS ...A double thick GEM (THGEM) detector with thin THGEM foils and small holes was constructed. In order to optimize the operation parameters of the detector, a simulation study of the detector was carried out using ANSYS and Garfield program. Some important characteristics, including primary electron transparency, avalanche development and the secondary electron loss were calculated. Parameters, such as electric field and gas choice were optimized.展开更多
为探测0．1～50MeV低能电子脉冲束流的位置分布，研制基于国产厚型气体电子倍增器（Thick Gaseous Electron Multiplier，THGEM）的二维位置探测器，位置分辨要求好于200gm，灵敏面积为50mm×50mm。THGEM的孔径为150gm、孔间距400p...为探测0．1～50MeV低能电子脉冲束流的位置分布，研制基于国产厚型气体电子倍增器（Thick Gaseous Electron Multiplier，THGEM）的二维位置探测器，位置分辨要求好于200gm，灵敏面积为50mm×50mm。THGEM的孔径为150gm、孔间距400pm、厚度100gm。用Geant4模拟了薄膜窗厚度、空气层厚度等对电子透过率和横向扩散的影响。根据模拟结果，优化了探测器的结构和设计。并用能量为5．9keV的X射线源55Fe测试不同工作气体的增益，单层最大增益好于1×10^4，双层最大增益好于6×10^4，能量分辨率好于23％。展开更多
设计了一种基于厚气体电子倍增器(THGEM)的快中子探测器。通过研究其对252Cf快中子源(2.13 Me V)和137Csγ源(661 ke V)的响应,分别得到了在80 m V、160 m V、260 m V三种电子学阈值下,探测器对γ射线抑制和快中子探测的结果。结果表明...设计了一种基于厚气体电子倍增器(THGEM)的快中子探测器。通过研究其对252Cf快中子源(2.13 Me V)和137Csγ源(661 ke V)的响应,分别得到了在80 m V、160 m V、260 m V三种电子学阈值下,探测器对γ射线抑制和快中子探测的结果。结果表明在阈值为260 m V、γ射线全部抑制的条件下,探测器有70V的工作电压调整范围,能够探测到中子的(n,p)过程产生的反冲质子信号。展开更多
厚型气体电子倍增器（Thick Gaseous Electron Multiplier，THGEM／TGEM）在高能物理实验中有广泛应用，如X射线、带电粒子及中子的探测和成像等领域。THGEM的制作通过印制电路的钻孔、蚀刻和外形等工艺来实现，并要求具有高耐压、强电...厚型气体电子倍增器（Thick Gaseous Electron Multiplier，THGEM／TGEM）在高能物理实验中有广泛应用，如X射线、带电粒子及中子的探测和成像等领域。THGEM的制作通过印制电路的钻孔、蚀刻和外形等工艺来实现，并要求具有高耐压、强电场、小孔间距和高孔位精度等特点。本文将根据THGEM的以上特点，分析其对PCB在材料选择、设计和工艺制程等方面的特殊要求，并通过对比各条件的产品性能数据给出应用于高性能THGEM制作的PCB解决方莱。展开更多
This work shows the results of a streamer discharge mode studies in various gas detectors developed up-to-date. The results are based on a new experimental data from high-speed thin-gap gas detector application develo...This work shows the results of a streamer discharge mode studies in various gas detectors developed up-to-date. The results are based on a new experimental data from high-speed thin-gap gas detector application developments as well as on basic knowledge of multi-wire devices operations.展开更多
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
基金supported by the China Institute of Atomic Energy and University of Chinese Academy of SciencesNational Natural Science Foundation of China(Nos.11575193 and U1732266)+2 种基金Key Research Program of Frontier Sciences,CAS(No.QYZDB-SSWSLH039)the Youth Innovation Promotion Association of CAS(No.2016153)the Natural Science Key Foundation of Guangxi(No.2015GXNSFDA139002)
文摘In cases of high radiation emergencies,we propose a surface contamination monitor(SCM)that can quickly measure and pinpoint the contamination distribution in the affected population.Thick gaseous electron multiplier(THGEM)has several advantages,including fast response time and good spatial resolution.Based on new THGEMs,a two-dimensional imaging detector was developed for alpha detection,with a position resolution greater than 3 mm.The detector design and test results are described in this paper.Fast radiation imaging SCMs,with a 40mm×40 mm sensitive area,are currently under development.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10775181 and 10775151.
文摘Thick gas electron multipliers (THGEMs) are new types of gas detectors with merits such as a high counting rate,anti-radiation,high gain,robustness and relatively low cost.We establish an up-down THGEM detector hodoscope system for detecting and displaying muon tracks.Muon tracks can be well observed with the detectors and the present study lays an important technological foundation for the domestic and mass production of THGEMs.
基金Supported by Fundamental Science on Nuclear Waste and Environmental Security Laboratory,Southwest University of Science and Technology. (Grant No.11zxnk03)
文摘A double thick GEM (THGEM) detector with thin THGEM foils and small holes was constructed. In order to optimize the operation parameters of the detector, a simulation study of the detector was carried out using ANSYS and Garfield program. Some important characteristics, including primary electron transparency, avalanche development and the secondary electron loss were calculated. Parameters, such as electric field and gas choice were optimized.
文摘为探测0．1～50MeV低能电子脉冲束流的位置分布，研制基于国产厚型气体电子倍增器（Thick Gaseous Electron Multiplier，THGEM）的二维位置探测器，位置分辨要求好于200gm，灵敏面积为50mm×50mm。THGEM的孔径为150gm、孔间距400pm、厚度100gm。用Geant4模拟了薄膜窗厚度、空气层厚度等对电子透过率和横向扩散的影响。根据模拟结果，优化了探测器的结构和设计。并用能量为5．9keV的X射线源55Fe测试不同工作气体的增益，单层最大增益好于1×10^4，双层最大增益好于6×10^4，能量分辨率好于23％。
文摘设计了一种基于厚气体电子倍增器(THGEM)的快中子探测器。通过研究其对252Cf快中子源(2.13 Me V)和137Csγ源(661 ke V)的响应,分别得到了在80 m V、160 m V、260 m V三种电子学阈值下,探测器对γ射线抑制和快中子探测的结果。结果表明在阈值为260 m V、γ射线全部抑制的条件下,探测器有70V的工作电压调整范围,能够探测到中子的(n,p)过程产生的反冲质子信号。
文摘厚型气体电子倍增器（Thick Gaseous Electron Multiplier，THGEM／TGEM）在高能物理实验中有广泛应用，如X射线、带电粒子及中子的探测和成像等领域。THGEM的制作通过印制电路的钻孔、蚀刻和外形等工艺来实现，并要求具有高耐压、强电场、小孔间距和高孔位精度等特点。本文将根据THGEM的以上特点，分析其对PCB在材料选择、设计和工艺制程等方面的特殊要求，并通过对比各条件的产品性能数据给出应用于高性能THGEM制作的PCB解决方莱。
文摘This work shows the results of a streamer discharge mode studies in various gas detectors developed up-to-date. The results are based on a new experimental data from high-speed thin-gap gas detector application developments as well as on basic knowledge of multi-wire devices operations.
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。
