γ暴高能辐射的研究一直是天体物理和宇宙线物理的研究热点,但在100 Ge V及以上能区至今尚未获得确定的观测结果。位于西藏羊八井宇宙线观测站(海拔4 300 m)的ARGO-YBJ实验具有高海拔、大视场等特点,其阈能约几百个Ge V,在探测高能γ暴...γ暴高能辐射的研究一直是天体物理和宇宙线物理的研究热点,但在100 Ge V及以上能区至今尚未获得确定的观测结果。位于西藏羊八井宇宙线观测站(海拔4 300 m)的ARGO-YBJ实验具有高海拔、大视场等特点,其阈能约几百个Ge V,在探测高能γ暴方面具有独特的优势。利用ARGO-YBJ实验中的"双前峰面"事例,可降低探测器的阈能达几十个Ge V,提高实验探测γ暴的灵敏度。作者研究了ARGO-YBJ实验中的"双前峰面"事例,并通过Monte Carlo模拟,估算出利用该类事例探测高能区(10—100 Ge V)γ暴所需要的最低能流为10-4—10-3erg.cm^(-2)。展开更多
The ARGO-YBJ experiment is presently under construction at the Yangbaijing high Altitude Comsmic Ray Laboratory(4300m a.s.l).90 Km North to Lhasa(Tibet,peolpl's Republic of China) ARGO-YBJ will study fundamental i...The ARGO-YBJ experiment is presently under construction at the Yangbaijing high Altitude Comsmic Ray Laboratory(4300m a.s.l).90 Km North to Lhasa(Tibet,peolpl's Republic of China) ARGO-YBJ will study fundamental issues in cosmic ray and astroparticle physics by detecting small size air showers.The detector covers-71×74 square meters with a single layer of resistive Plate Counters(RPCs),surrounded by a guard ring partially instrumented.An event-driven data collection scheme is implemented by using a custom bus protocol./Key features of this architecture are block-oriented data transfer and read-out cycles labeled by trigger number,Hardware engines in both master and DAQ boards handle bus transactions and provide event builing capability,achieving real-time data processing with no software overhead.In this paper we present the hardware design of the ARGO experiment's DAQ which benefits from the flexible architecture of in-system reconfigurable FPGAs.The dataacquistition boards specifically developed for this application will be described.展开更多
The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured below the so-called ＂knee＂ by using a hybrid experiment with a wide field-of-view Cherenkov telescope and the Resistive Plate Chamber （RPC...The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured below the so-called ＂knee＂ by using a hybrid experiment with a wide field-of-view Cherenkov telescope and the Resistive Plate Chamber （RPC） array of the ARGO-YBJ experiment at 4300 m above sea level. The Hydrogen and Helium nuclei have been well separated from other cosmic ray components by using a multi-parameter technique. A highly uniform energy resolution of about 25% is achieved throughout the whole energy range （100-700 TeV）. The observed energy spectrum is compatible with a single power law with index γ=-2.63±0.06.展开更多
文摘γ暴高能辐射的研究一直是天体物理和宇宙线物理的研究热点,但在100 Ge V及以上能区至今尚未获得确定的观测结果。位于西藏羊八井宇宙线观测站(海拔4 300 m)的ARGO-YBJ实验具有高海拔、大视场等特点,其阈能约几百个Ge V,在探测高能γ暴方面具有独特的优势。利用ARGO-YBJ实验中的"双前峰面"事例,可降低探测器的阈能达几十个Ge V,提高实验探测γ暴的灵敏度。作者研究了ARGO-YBJ实验中的"双前峰面"事例,并通过Monte Carlo模拟,估算出利用该类事例探测高能区(10—100 Ge V)γ暴所需要的最低能流为10-4—10-3erg.cm^(-2)。
文摘The ARGO-YBJ experiment is presently under construction at the Yangbaijing high Altitude Comsmic Ray Laboratory(4300m a.s.l).90 Km North to Lhasa(Tibet,peolpl's Republic of China) ARGO-YBJ will study fundamental issues in cosmic ray and astroparticle physics by detecting small size air showers.The detector covers-71×74 square meters with a single layer of resistive Plate Counters(RPCs),surrounded by a guard ring partially instrumented.An event-driven data collection scheme is implemented by using a custom bus protocol./Key features of this architecture are block-oriented data transfer and read-out cycles labeled by trigger number,Hardware engines in both master and DAQ boards handle bus transactions and provide event builing capability,achieving real-time data processing with no software overhead.In this paper we present the hardware design of the ARGO experiment's DAQ which benefits from the flexible architecture of in-system reconfigurable FPGAs.The dataacquistition boards specifically developed for this application will be described.
基金Supported by NSFC(10975145,11075170)Knowledge Innovation Fund(H85451D0U2)of IHEP+2 种基金Chinese Ministry of Science and Technology,Chinese Academy of Science,Key Laboratory of Particle Astrophysics,CASin Italy by the Istituto Nazionale di Fisica Nucleare(INFN)Ministero dell’Istruzione,dell’Università e della Ricerca(MIUR)
文摘The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured below the so-called ＂knee＂ by using a hybrid experiment with a wide field-of-view Cherenkov telescope and the Resistive Plate Chamber （RPC） array of the ARGO-YBJ experiment at 4300 m above sea level. The Hydrogen and Helium nuclei have been well separated from other cosmic ray components by using a multi-parameter technique. A highly uniform energy resolution of about 25% is achieved throughout the whole energy range （100-700 TeV）. The observed energy spectrum is compatible with a single power law with index γ=-2.63±0.06.
