The Trigger System for the Collider Detector Facility

The trigger logic for the Collider Detector Facility (CDF) at Fermilab is described. An analog/digital system constructs triggers based on clusters of energy in the calorimetry. These triggers are then combined with signals from the muon and central tracking systems to make a global trigger. Two levels of trigger logic have been implemented: a 'Level 1' trigger which is dead-timeless, and a more sophisticated Level 2 trigger. The rejection factor provided by these two systems will be 103 - 104.     

计算机逻辑编程技术在谱仪触发判选系统中的应用

ＰＬＤ和ＦＰＧＡ是逐渐发展起来的可编程逻辑器件，可由用户用计算机编程实现需要的逻辑，本文简单介绍了器件的开发和在谱仪的触发判选系统中的应用。     

多路望远镜系统中的电子学和粒子分辨技术

本文介绍了多路望镜系统中的电子学系统和在测量核反应双微分截面实验中所使用的粒子分辨技术，该系统除了用能损△Ｅ谱和脉冲形状分辨ＰＳＤ谱来鉴别粒子外，还使用二维粒子分辨技术即用Ｅ－△，Ｅ－ＰＳＤ和△Ｅ－ＰＳＤ等谱来联合临别别粒子，取得了极好的分辨效果。     

大气切伦科夫望远镜中的探测器系统

本文介绍兴隆站大气切伦科夫望远镜中的探测器系统，测量了抛物面反射镜的反射效率和光电倍增管磁屏蔽的效果，给出了测得的宇宙线切伦科夫光的幅度谱。     

The Development of the New Data Acquisition System Without Hardware Trigger for the Super-Kamiokande Experiment

An online system of the underground neutrino detector, Super-Kamiokande is scheduled to be upgraded in 2008 together with front-end electronics. This detector consists of 50 000 tons of pure water equipped with about 13 000 photo-multipliers (PMTs) to detect Cherenkov light. The new online system is required to accept the dataflow of up to 800 MB/s from the front-end electronics and process them for the offline analysis. We will utilize a Gigabit Ethernet network and parallel data processing to handle this large amount of flow. In the new data acquisition scheme, we will not use a hardware event-trigger but read out every hit data from the front-end electronics and process them by the online farm. Therefore, there is no threshold of the number of PMT hits and the detector will become more sensitive to important cosmic-ray events such as relic neutrino from supernova and low energy solar neutrino. In addition to that, a dead-timeless system is desirable for the continuous measurement 365 days a year. In this paper, the detailed design of the upgraded online system and testing activities using prototypes will be described.     

Design of Synchronous Trigger Timing System Based on FPGA

<正>Synchronization pulse trigger signal with multi-channel independently adjustable in sequential systems is used to drive electron gun,modulator,and microwave power amplifier of accelerator,and keep its working synchronously.The traditional trigger is mainly composed of signal source and analog circuits with separation element,which has the deficiency such as low precision,poor tunability and vulnerability.     

GAL器件在触发判选径迹系统中的应用

本文简要介绍在北京谱仪触发判选的径迹系统中采用GAL器件作相“或”电路、符合配对电路及径迹数相加电路。     

重离子加速器同步定时触发系统的实现

同步定时触发系统是重离子同步加速器的控制核心,控制磁场电源对带电离子束进行同步加速,其对可靠性和定时精度要求高。在重离子治癌、材料辐照等领域的发展中,为了满足这些领域对重离子同步加速器小型化的需求,本文以NIOSII为核心处理器,结合FPGA上的可编程片上系统（SOPC）,实现了一种基于可编程硬件的同步定时触发系统。该系统可控制延时精度,且使用灵活、可靠,易升级,向小型化的同步加速器及重离子治癌等应用工程提供了切实可行的方案。     

中子通量测量的质子反冲望远镜

研制了用于测量D-T中子通量的质子反冲闪烁望远镜,望远镜由二个对带电粒子响应的半导体探测器(△E)和一个CsI(TI)闪烁探测器(E)组成.利用脉冲形状甄别技术抑制CsI闪烁探测器的γ射线本底,△E探测器的高偏压对提高信噪比是重要的.二个△E探测器和一个E探测器实现了三重符合.在三重符合条件下,通过有、无辐射体的测量得...     

四通道高速同步采集多次触发存储测试系统

设计了一种基于CPLD和单片机控制、FLASH MEMORY(闪速大容量存储器)存储的新型存储测试系统。利用FLASH MEMORY的大容量存储特性,系统可实现多通道的同步采集,而且可以完成多次记录一次读数的功能。多路同步、高速采集、多次触发以及工作参数可调节的功能特性,扩展了存储测试系统的适用性,可广泛用于爆炸场的各种压力及温度测试。     

新型望远镜带电粒子探测系统结构设计与理论模拟

为了在兰州重离子加速器国家实验室(HIRFL)的放射性束流线(RIBLL1)上开展基于完全运动学测量的远离β稳定线奇异核反应机制的研究,需研制一套由多个独立的望远镜系统(探测模块)组成的带电粒子探测阵列。每个探测模块包含1块16×16的厚65μm的双面硅条探测器、1块4×4的厚1 000μm的像素硅探测器和由雪崩光二极管(APD)读出的4×4CsI(Tl)阵列探测器。该探测阵列可实现大的能量测量范围、高能量分辨率和位置分辨,同时具备大立体角覆盖和粒子关联测量的能力。通过Geant4探测器模拟软件对单个探测模块进行模拟,结合对探测模块各部分的实验测试,给出了探测模块的设计方案和整体性能指标。     

The Structure of the ZEBRA Telescope, the Integration Tests and the First Calibration Results

The ZEBRA telescope is a balloon borne low energy gamma ray instrument, sensitive in the photon energy range 0.2-10MeV. The main characteristics and components of the telescope are described, and its performance during laboratory calibration is discussed, after its integration with the flight electronics.     

Laboratory Gamma-Ray Images Using the ZEBRA Telescope

A series of approximately 100 laboratory images have been made with the ZEBRA astronomical telescope using a range of radioactive sources. These images were aimed at assessing the performance of the telescope and included combinations of point sources, extended sources, ring sources as well as vignetted sources. Besides linear reconstruction techniques a range of non linear image restoration processes are discussed.     

甚高能大气切伦科夫望远镜中的光补偿系统及其产生的噪声

本文介绍在甚高能（１０１１～１０１３ｅＶ）大气切伦科夫望远镜中用于稳定光电倍增管阳极电流的光补偿系统，并给出了其产生的噪声水平。     

Au-Si面垒型带电粒子望远镜的研制

介绍了厚度为350μm、有效面积为530mm~2的△E和厚度为700μm、有效面积为1380mm~2E探测器所组成的全耗尽Au-Si面垒型带电粒子望远镜的制备工艺、测试结果(Thc-c'源8.78MeV的能量分辨率△E探测器为0.8%、E探测器分辨为1.2%)和该探测器的主要用途.     

羊八井Muon望远镜中基于FPGA的方向测量电路

方向测量电路在羊八井Muon望远镜中用于测定Muon粒子的入射方向.该望远镜由上下相隔一定距离两层6X4排列的塑料闪烁体探测器阵列构成,能探测77个Muon粒子的入射方向及各个方向入射粒子计数率.能监测记录到高计数率、窄脉宽的输入信号以及极短的死时间是Muon望远镜对方向探测电路的要求.借助资源丰富、高速的FPGA,在单个芯片上实现了Muon望远镜方向探测电路所要求的全部功能.此外由于FPGA提供在线编程,使得对系统的功能修改或升级非常方便.低功耗是基于FPGA的方向测量电路的另一大优势.     

FPGA,VHDL和BES主触发控制电路

用高速的ＦＰＧＡ代替ＥＣＬ集成电路制作了北京谱仪的主触发电路，其设计过程中使用了硬件描述语言ＶＨＤＬ，得到了和原电路同样的性能，但增加了灵活性。     

光敏丝室探测器PET的触发判选处理器

介绍了为光敏丝室探测器PET而设计的触发判选处理器（TRIG）的结构和原理，该处理器具有触发判选，计数率损失测量，随机符合事例率测量，探测器分区计数统计以及系统定标等多项功能，由于应用了EPLD技术和流水线作业等技术，实现了TRIG系统的高集成度和高性能 。