利用宇宙线对BESⅢ量能器CsⅠ（Tl）晶体探测器单元的测量

利用宇宙射线进行探测器模型的性能测试是高能物理普遍采用的方法，其中最重要的步骤之一就是确定宇宙线入射的准确位置和径迹．多数采用丝室探测器来进行宇宙线的精确定位，需要很高的造价和复杂的电子学系统．本文介绍一种简单的定位方法，采用塑料闪烁体条加波移剂光纤编码读出的方式，可以实现精度为1cm的定位．据此建立了一套实验装置，对BESⅢ电磁量能器CsⅠ（Tl）晶体探测器单元的光输出强度和不均匀性进行了测量．     

Link 11数据链干扰技术

从Link11数据链的数学模型入手，分析其在噪声干扰、单音干扰、多音干扰等下的误码性能。仿真结论表明，对Link11的干扰技术中，不论采用噪声干扰，或者是采用单音或多音干扰，只要掌握其工作原理，就可以采取适当方式对其进行干扰。从另一方面可以看出，Link11由于易损性等原因，已经暴露了许多不尽人意的缺点，一种新型的数据链——Link22产生，并对其特点作了简单分析。     

Study of radiation background at the north crossing point of the BEPCⅡ in collision mode

Understanding the radiation background at the north crossing point (NCP) in the tunnel of BEPCII is crucial for the performance safety of the High Purity Germanium (HPGe) detector, and in turn of great significance for long-term stable running of the energy measurement system. Therefore, as the first step, a NaI(Tl) detector is constructed to continuously measure the radiation level of photons as background for future experiments. Furthermore, gamma and neutron dosimeters are utilized to explore the radiation distribution in the vicinity of the NCP where the HPGe detector will be located. Synthesizing all obtained information, the shielding for neutron irradiation is studied based on model-dependent theoretical analysis.     

A fast luminosity monitor for BEPCⅡ

The fast luminosity monitor counting the γ photons above a given energy threshold emitted from radiative Bhabha scattering has been operated in the BEPC Ⅱ to measure the relative luminosity bunch by bunch for the first time and used successfully in beam tuning of BEPC Ⅱ. In the relative mode the monitor is able to deliver the relative luminosities with an accuracy of 0.8 %. By steering the electron beam while observing the counting rate changes of the monitor the horizontal and vertical sizes of the bunch spots can be estimated as： Sxe＋ =Sxe =0.356 mm, Sye＋ =Sye- =0.011 mm.     

复杂电磁环境及其判断方法探析

开展复杂电磁环境下的部队演练训练是新时期的训练方向,因此对复杂电磁环境进行深入研究是必须首要解决的迫切课题,而判断电磁环境复杂程度又是其中的一个关键点。对复杂电磁环境的概念与表现形式进行了研究,提出了一种基于矩阵对策的电磁环境复杂程度的判断方法。     

基于ANP的电子对抗作战能力评估方法研究

针对电子对抗作战能力评估的问题,运用基于层次分析法评估方法,须要求各层次作战能力内部的指标相互独立,不相互影响,而网络层次分析法ANP没有上述的应用局限。以典型的通信对抗分队为例,采用ANP对电子对抗部队作战能力进行评估,建立新的评估指标体系,通过计算极限超矩阵得出各个指标的权重,应用权重结果比较不同指标的重要性,得出的结论对指导电子对抗部队基地训练具有一定的意义。     

利用ICCD定位宇宙线来测量探测器时间分辨的方法研究

本研究采用双层150 mm×150 mm闪烁条阵列定位宇宙线的入射和出射位置. 阵列信号光使用波移光纤吸收传输,在ICCD相机前插入前置像增强器,使信号光延迟大于200 ns, 使ICCD可以由外部高速触发信号控制,有效记录随机触发事例.该宇宙线定位系统可以同时多点密集测量 通用探测器测试平台的时间分辨和闪烁光的渡越时间.该新方法与传统时间分辨测量方法相比提高了30倍以上 的效率.实验结果显示:时间探测器的时间分辨好于200 ps,满足通用探测器测试平台的设计要求.     

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

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%.     

LUND面积定律产生子在R值测量中的应用

对Lund弦碎裂模型强子化面积定律严格求解,得到e⁺e^－湮没产生少体初始强子态的遍举分布.基于面积定律的新产生子LUARLW在2—5GeV能区的模拟结果与BES数据的多种谱分布符合很好,用于BES上强子产生总截面测量的强子探测效率的估计.     

ADOBE与RIA平台主流技术的发展探析

本文通过解析RIA平台的发展,对比了几种主流的RIA开发技术,详细分析了Adobe平台的技术特点,为RIA的开发和学习提供了有意义的参考。