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Performances of RETGEM with resistive electrodes made of kapton foils

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Chinese Physics C 2011年第12期35卷 1120-1123页

作者：俞伯祥刘宏邦谢一冈章爱武唐爱松杨亚聃董洋李敏王志刚谢宇广蔡啸周莉胡涛吕军光 Institute of High Energy Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Second Academy of China Aerospace Science and Industry CORP

THGEM with resistive Kapton electrodes （RETGEM） has been developed to make the THGEM more tolerant to discharges. At higher gains with resistive electrodes, serious discharges may travel to the streamer mode, in contrast to violent sparks in conventional GEMs. These streamers are mild and less dan- gerous to the detector and the front-end electronics. RETGEM looks very promising, and its basic properties are being studied. Recently we developed and tested the THGEM with electrodes using 20 um thick resistive kapton foils. The new RETGEM performs at a lower discharge current, has a lower discharge probability, and has a good energy resolution of 27% and a high effective gas gain and long-term stability.

关键词： RETGEM resistive electrodes Kapton foil GEM

液化气体类危险品运输中安全状态的预警系统研究

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武汉理工大学学报(交通科学与工程版) 2000年第3期 307-307页

作者：章爱武

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三峡枢纽过坝货船(队)尺度系列

武汉理工大学学报(交通科学与工程版) 2000年第1期 58-58页

作者：章爱武

A novel 2-dimensional cosmic ray position detector based on a CsI(Na) pixel array and an ICCD camera

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Chinese Physics C 2012年第11期36卷 1101-1105页

作者：葛永帅王志刚俞伯祥谢宇广章爱武薛镇刘颖彪高龙牛顺利蔡啸方建孙希磊吕绮雯宁飞鹏周莉胡涛吕军光 State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences Shanxi University

A novel 2-D cosmic ray position detector has been built and studied. It is integrated from a CsI（Na） crystal pixel array, an optical fiber array, an image intensifier and an ICCD camera. The 2-D positions of one cosmic ray track is determined by the location of a fired CsI（Na） pixel. The scintillation light of these 1.0× 1.0 mm CsI（Na） pixels is delivered to the image intensifier through fibers. The light information is recorded in the ICCD camera in the form of images, from which the 2-D positions can be reconstructed. The background noise and cosmic ray images have been studied. The study shows that the cosmic ray detection efficiency can reach up to 11.4%, while the false accept rate is less than 1%.

关键词： cosmic ray 2-D position CsI(Na) crystal pixel array optical fiber array image intensifier ICCD camera

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北京谱仪III电磁量能器晶体尺寸的测量

核电子学与探测技术 2009年第2期29卷 344-348页

作者：宁飞鹏安正华蔡啸董明义方建刘福虎吕绮雯孙丽君孙希磊王志刚俞伯祥章爱武周莉胡涛吕军光山西大学太原030006 中国科学院高能物理研究所北京100049

对北京谱仪电磁量能器中晶体的分布、CsI晶体尺寸的测量所用的仪器和方法进行了分析,最后对所有晶体的尺寸进行了统计。

关键词：北京谱仪Ⅲ电磁量能器 CsⅠ(TI)晶体晶体尺寸

Performance of MPPC at low temperature

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Chinese Physics C 2012年第7期36卷 633-638页

作者：安正华吕军光石峰胡涛蔡啸俞伯祥方建谢宇广王志刚薛镇孙希磊吕绮雯章爱武宁飞鹏周莉孙丽君葛永帅刘颖彪吴冲 Institute of High Energy Physics Chinese Academy of Sciences Shanxi University College of Science China University of Petroleum

The performance of a MultiPixel Photon Counter （MPPC） from room to liquid nitrogen tem- peratures were studied. The gain, the noise rate and bias voltage of the MPPC as a function of temperature were obtained. The experimental results show that the MPPC can work at low temperatures. At nearly liquid nitrogen temperatures, the gain of the MPPC drops obviously to 35% and the bias voltage drops about 9 V compared with that at room temperature. The thermal noise rate from 106 Hz/mm at room temperature drops abruptly to 0 Hz/mm at -100℃. The optimized operation point can be acquired by the experiment.

关键词： silicon photomultiplier MPPC low temperature gain noise rate

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基于硼中子治癌反应堆的热中子照相孔道设计

基于硼中子治癌反应堆的热中子照相孔道设计

Experimental study on the performance of a single-THGEM gas detector

第十六届全国核电子学与核探测技术学术年会

作者：俞伯祥李义国彭旦鲁瑾章爱武刘万金赵航蔡啸谢宇广王志刚周莉胡涛吕军光核探测与核电子学国家重点实验室中国科学院高能物理研究所

本文主要描述了硼中子治癌反应堆装置的中子照相用热中子孔道设计。为了研究CCD中子照相的原理与方法,在硼中子治癌反应堆装置已有的热中子出口的基础上,设计了一个适用于中子照相的热中子孔道。用Geant4蒙特卡洛程序对中子照相热中子... 详细信息

本文主要描述了硼中子治癌反应堆装置的中子照相用热中子孔道设计。为了研究CCD中子照相的原理与方法,在硼中子治癌反应堆装置已有的热中子出口的基础上,设计了一个适用于中子照相的热中子孔道。用Geant4蒙特卡洛程序对中子照相热中子孔道进行了模拟,根据模拟结果设计了一个与反应堆装置相匹配的热中子孔道,并对这个孔道进行了初步的实验研究,结果表明实验和模拟基本符合,孔道出口热中子通量达到了～1.0×106n/cm2/s,最大L/D达到了58,偏移角为4.1度,孔道出口直径达到了10cm,初步达到了中子照相的要求。

关键词：中子照相 ICCD 热中子孔道热中子通量 L/D

来源： cnki会议评论

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Chinese Physics C 2010年第1期34卷 83-87页

作者：安正华吕军光王志刚蔡啸董明义方建胡涛吕绮雯宁飞鹏孙丽君孙希磊王晓东薛镇俞伯祥章爱武周莉郑阳恒 Institute of High Energy Physics CAS Graduate University of Chinese Academy of Sciences Shanxi University University of Science and Technology of China

A kind of thick GEM-like gaseous electron multiplier （THGEM）, which is mechanically an expansion of the GEM with its various dimensions being enlarged, is studied. The leak current of THGEM plates is measured. The effective gain and energy resolution of a single THGEM are studied with a source of 55Fe, and the effective gain of the single THGEM versus the electric field strength in the induction region is investigated. The results show that the leak current of THGEM plates is less than 200 pA. In an atmospheric-pressure standard gas mixture, 8×103 effective gain and about 32% energy resolution can be reached for the single-THGEM detector.

关键词： gas electron multipliers hole multiplier effective gain energy resolution

Fast light of CsI(Na) crystals

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Chinese Physics C 2011年第12期35卷 1130-1133页

作者：孙希磊吕军光胡涛周莉曹俊王贻芳占亮俞伯祥蔡啸方建谢宇广安正华王志刚薛镇章爱武吕绮雯宁飞鹏葛永帅刘颖彪 Institute of High Energy Physics CAS Shanxi University

The responses of different common alkali halide crystals to alpha-rays and gamma-rays are tested in this research. It is found that only CsI（Na） crystals have significantly different waveforms between alpha and gamma scintillations, while others do not exhibit this phenomena. The rise time of the fast light is about 5 ns and the decay time is 174-12 ns. It is suggested that the fast light of CsI（Na） crystals arises from the recombination of free electrons with self-trapped holes of the host crystal CsI. Self-absorption limits the emission of fast light of CsI（T1） and NaI（T1） crystals.

关键词： CsI(Na) waveform ionization scintillation exciton self-absorption