Optical properties of water for the Yangbajing water cherenkov detector

	Optical properties of water for the Yangbajing water cherenkov detector
	Gao Shang-qi; Sun Zhi-bin; Jiang Yuan-da; Wang Chao; Du Ke-ming
	2011
会议名称	International Symposium on Photoelectronic Detection and Imaging 2011 - Space Exploration Technologies and Applications
会议日期	MAY 24-26, 2011
会议地点	Beijing, PEOPLES R CHINA
关键词	Cherenkov radiation Lambert-beer law Water attenuation LED PMT Peak holder
页码	81961H
通讯作者	Gao, SQ (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China.
中文摘要	Cherenkov radiation is used to study the production of particles during collisions, cosmic rays detections and distinguishing between different types of neutrinos and electrons. The optical properties of water are very important to the research of Cherenkov Effect. Lambert-beer law is a method to study the attenuation of light through medium. In this paper, optical properties of water are investigated by use of a water attenuation performance test system. The system is composed of the light-emitting diode (LED) light source and the photon receiver models. The LED light source model provides a pulse light signal which frequency is 1 kHz and width is 100ns. In photon receiver model, a high sensitivity photomultiplier tube (PMT) is used to detect the photons across the water. Because the output voltage amplitude of PMT is weak which is from 80mv to 120mV, a low noise pre-amplifier is used to improve the detector precise. An effective detector maximum time window of PMT is 100ns for a long lifetime, so a peak holder circuit is used to hold the maximum peak amplitude of PMT for the induced photons signal before the digitalization. In order to reduce the noise of peak holder, a multi-pulse integration is used before the sampling of analog to digital converter. At last, the detector of photons from the light source to the PMT across the water is synchronized to the pulse width of the LED. In order to calculate the attenuation coefficient and attenuation length of water precisely, the attenuation properties of air-to-water boundary is considered in the calculation.
英文摘要	Cherenkov radiation is used to study the production of particles during collisions, cosmic rays detections and distinguishing between different types of neutrinos and electrons. The optical properties of water are very important to the research of Cherenkov Effect. Lambert-beer law is a method to study the attenuation of light through medium. In this paper, optical properties of water are investigated by use of a water attenuation performance test system. The system is composed of the light-emitting diode (LED) light source and the photon receiver models. The LED light source model provides a pulse light signal which frequency is 1 kHz and width is 100ns. In photon receiver model, a high sensitivity photomultiplier tube (PMT) is used to detect the photons across the water. Because the output voltage amplitude of PMT is weak which is from 80mv to 120mV, a low noise pre-amplifier is used to improve the detector precise. An effective detector maximum time window of PMT is 100ns for a long lifetime, so a peak holder circuit is used to hold the maximum peak amplitude of PMT for the induced photons signal before the digitalization. In order to reduce the noise of peak holder, a multi-pulse integration is used before the sampling of analog to digital converter. At last, the detector of photons from the light source to the PMT across the water is synchronized to the pulse width of the LED. In order to calculate the attenuation coefficient and attenuation length of water precisely, the attenuation properties of air-to-water boundary is considered in the calculation.
收录类别	EI ; CPCI
会议主办者	Photoelect Technol Profess Comm, CSA, Tianjin Jinhang Inst Tech Phys, CASIC, Sci & Technol Low Light Level Night Vis Lab, Chinese Soc Astronaut
会议录	INTERNATIONAL SYMPOSIUM ON PHOTOELECTRONIC DETECTION AND IMAGING 2011: SPACE EXPLORATION TECHNOLOGIES AND APPLICATIONS
会议录出版者	SPIE-INT SOC OPTICAL ENGINEERING
会议录出版地	BELLINGHAM
学科主题	空间技术
语种	英语
ISSN号	0277-786X
ISBN号	978-0-81948-837-4
内容类型	会议论文
源URL	[http://ir.nssc.ac.cn/handle/122/2936]
专题	国家空间科学中心_空间技术部
推荐引用方式 GB/T 7714	Gao Shang-qi,Sun Zhi-bin,Jiang Yuan-da,et al. Optical properties of water for the Yangbajing water cherenkov detector[C]. 见:International Symposium on Photoelectronic Detection and Imaging 2011 - Space Exploration Technologies and Applications. Beijing, PEOPLES R CHINA. MAY 24-26, 2011.