基于TKO—CAMAC的羊八井EAS阵列数据采集系统

本文介绍一个基于ＴＫＯ－ＣＡＭＡＣ数据采集系统，该系统采集坐落在西藏羊八井的广延空气簇射阵列数据，它是由ＴＫＯ－ＣＡＭＡＣ系列插件和ＰＣ－３８６微机组成，除此以外，它还包括一个激光标定检测系统及由原子钟和ＧＰＳ（全球定位系统）组成的定时系统。     

FASTBUS—CAMAC数据采集系统在宇宙线EAS实验中的应用

本文以中日合作西藏羊八井宇宙线ＥＡＳ实验所使用的ＦＡＳＴＢＵＳ－ＣＡＭＡＣ混合数据采集系统为例，介绍了ＦＡＳＴＢＵＳ总线的主要特点，功能模块、控制模块以及与ＰＣ的接口功能和控制方法，并对ＦＡＳＴＢＵＳ的具体应用进行了深入的分析。     

基于TKO－CAMAC的羊八井EAS阵列数据采集系统

本义介绍一个基于ＴＫＯ－ＣＡＭＡＣ数据采集系统，该系统采集坐落在西藏羊八井的广延空气簇射阵列数据，它是由ＴＫＯ－ＡＭＡＣ系列插件和ＰＣ－３８６微机组成。除此以外，它还包括一个激光标定检测系统及由原子钟和ＧＰＳ（全球定位系统）组成的定时系统。     

羊八井空气簇射轴芯探测器

为了分析研究宇宙线膝区的化学成分,设计建造了羊八井空气簇射轴芯探测器阵列(YAC)。该探测器安装在海拔4 300 m的西藏羊八井宇宙线观测站内,可以与西藏羊八井广延大气簇射阵列做联动混合实验。探测器用闪烁体单元来测量到达探测器的空气簇射轴芯次级粒子,每个闪烁体单元放置在40 cm×50 cm的盒子中,覆盖了3.5 cm厚的铅板。测量的簇射轴芯次级粒子数目范围为1(最小电离粒子)～10~6MIP。第一阶段建造安装了16台探测器,称为"YAC—I",分布在面积为10 m~2的网格里。YAC-I用来检验强子相互作用模型。详细讨论YAC-I的性能。     

基与TKO—CAMAC的羊八井EAS阵数据采集系统

本文介绍一个基于ＴＫＯ－ＣＡＭＡＣ数据采集系统，该系统采集坐落在西西藏羊八角井的广延空气族射阵列数据。它是由ＴＫＯ－ＣＡＭＣ系列插件和ＰＣ－２８６微机组成。除此以外，它还包括一个激光标定检测系统及由原子钟和ＧＰＳ（全球定位系统）组成的定时系统。该系统已在西藏高原上成功地工作了三年了，获取了大量数据。由此获得了引起国际宇宙线界普遍重视的重要结果。     

基于LINAC慢正电子源的EGS4模拟

介绍基于ＢＥＰＣ ＬＩＮＡＣ和ＢＦＥＬ ＬＩＮＡＣＥ慢正电子束设备中正电子源部分的Ｍｏｎｔｅ－Ｃａｒｌｏ模拟过程。结果表明,从Ｔａ靶出射的快正电子产额在ＢＥＰＣ ＬＩＮＡＣ和ＢＦＥＬ ＬＩＮＡＣ运行兼容模式时分别为１．８４＊１０＾１０／ｓ和３．９＊１０＾１１／Ｓ。     

用于EAS阵列的大面积闪烁计数器的标定

本文介绍了一种用于ＥＡＳ观测阵列的在面积闪烁计数器的标定。对系统脉冲幅度通道及快速时间通道的标定均采用了ＮＩＭ／ＣＡＭＡＣ电子学系统。     

地磁场对光电倍增管增益的影响

羊八井大型高海拔空气簇射观测站(LHAASO)计划中,为研究20TeV以上的伽马射线天文和宇宙线物理,提出了建设1 km2地面簇射粒子阵列(KM2A)的设计方案.其中的塑料闪烁体探测器(ED)要用到5 000多个光电倍增管,对选用的光电倍增管的性能指标(线性度、增益及其一致性等)有着较高的要求.重点研究了地磁场对XF2...     

FASTBUS逻辑分析仪

ＦＡＳＴＢＵＳ（快总线）是广泛用于核探测器系统的数据采集的标准总线系统。本文介绍使用数据流编程的图形软件Ｌａｂ ＶＩＥＷ，配合ＳＮＯＯＰ诊查模块，在ＭＡＣＩＮＴＯＳＨ计算机上实现“软仪器”的ＦＡＳＴＢＵＳ逻辑分析仪。     

THINDOWN IN RADIOBIOLOGY：E．COLI B／r，Bs－1，B．SUBTILUS SPORES，AND V－79 CHINESE HAMSTER CELLS

ＴＨＩＮＤＯＷＮＩＮＲＡＤＩＯＢＩＯＬＯＧＹ：Ｅ．ＣＯＬＩＢ／ｒ，Ｂｓ－１，Ｂ．ＳＵＢＴＩＬＵＳＳＰＯＲＥＳ，ＡＮＤＶ－７９ＣＨＩＮＥＳＥＨＡＭＳＴＥＲＣＥＬＬＳＺｈａｎｇＣｈｕｎｘｉａｎｇ（张纯祥）（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓＺｈｏｎｇ...     

Timing Electronics and Fast Timing Methods with Scintillation Detectors

Time spectroscopy involves the measurement of the time relationship between two events. This paper reviews time pick-off techniques, practival time-pickoff circuits, and timing with scintillation detectors. A detailed comparison is made between leading-edge timing and constant-fraction timing. Typical timing resolution results are given for 60Co.     

DIII-D Timing System

The DIII-D tokamak, an upgrade of Doublet III, a device to study magnetic confinement fusion at GA Technologies, became operational in February 1986. The new timing system consists of two major subsystems. The trigger subsystem synchronizes control and data acquisition for the experiment. The clock subsystem is a centralized source of pulses for data acquisition equipment. The CAMAC hardware and the database software for the DIII-D timing system is discussed.     

快定时放大器

本文叙述了一种快定时放大器的结构，性能及实验结果以及在核物理实验中的应用，并对其工作原理进行了适当的分析。     

透射型定时探测器

本文介绍了由微道板构成的透射型定时探测器,得到的飞行时间系统的时间分辨为280ps。并对进一步改善时间特性作了讨论。     

BEPCII直线加速器定时系统

北京正负电子对撞机升级改造工程BEPCII的重要组成部分--直线加速器于2006年7月通过了所内预验收,其中定时系统是全新建造的基于EVG/EVR的事件定时系统[1],于2006年3月起投入运行,为直线加速器的电子枪、微波激励源、能量倍增器、正电子源、调制器、BPM等设备提供精确的时序触发信号.本文介绍直线加速器定时系统的研制、安装调试、运行和改进等工作情况.     

BEPCII事件定时系统

北京正负电子对撞机重大改造工程(BEPCⅡ)的定时系统主要包括用于产生各种触发信号和时钟信号的事件定时部分,以及储存环主频和注入器主频的锁相部分,其中前者的研制基于事件系统模块.本文介绍BEPCⅡ事件定时系统的结构和基本功能、任意Bucket选择的设计和实现、以及定时系统的总体性能.     

Sampling Pulses for Optimal Timing

When extracting unknown band-limited pulses from sampled data, the Nyquist criterion defines the minimum sampling frequency. With well-defined pulse shapes and a stationary noise environment one can use matched filters to recover time and amplitude, but this is usually not the case with scintillation detectors. If the noise is not stationary other methods must be used. Our study investigates different timing strategies and how the timing precision depends on ADC resolution and sample rate. It also compares the timing precision with data obtained from an analogue setup. Pulses from an LSO crystal with photomultiplier readout are studied experimentally. Our best method gives in this case a 10% improvement in timing compared to a matched filter approach. Some simulation results are also reported     

Fast Timing Methods for Semiconductor Detectors

This tutorial paper discusses the basic parameters which determine the accuracy of timing measurements and their effect in a practical application, specifically timing with thin-surface barrier detectors. The discussion focusses on properties of the detector, low-noise amplifiers, trigger circuits and time converters. New material presented in this paper includes bipolar transistor input stages with noise performance superior to currently available FETs, "noiseless" input terminations in sub-nanosecond preamplifiers and methods using transmission lines to couple the detector to remotely mounted preamplifiers. Trigger circuits are characterized in terms of effective rise time, equivalent input noise and residual jitter.     

CSNS电源磁测时序控制系统

电源磁测时序控制系统能够提供磁铁在运行过程中电源控制设备和磁铁测量设备所需要的时序触发信号和同步时钟信号,该系统的准确性和稳定性对于整个磁测显得极为重要。论文介绍了基于Xilinx系列FPGA硬件电路设计、电光-光电转换电路的设计、串口通信驱动模块和LabVIEW-EP-ICS人机控制界面的实现。通过联机测试结果表明,该系统满足了电源磁测对时序控制系统的要求。     

Design of Timing Synchronization Software on EAST-NBI

To ensure the uniqueness and recognition of data and make it easy to analyze and process the data of all subsystems of the neutral beam injector （NBI）, it is required that all subsystems have a unified system time. In this paper, the timing synchronization software is presented which is related to many kinds of technologies, such as shared memory, multithreading, TCP protocol and so on. Shared memory helps the server save the information of clients and system time, multithreading can deal with different clients with different threads, the server works under Linux operating system, the client works under Linux operating system and Windows operating system. With the help of this design, synchronization of all subsystems can be achieved in less than one second, and this accuracy is enough for the NBI system and the reliability of data is thus ensured.