Clustered Data Acquisition for the CMS Experiment

Powerful mainstream computing equipment and the advent of affordable multi-Gigabit communication technology allow us to tackle data acquisition problems with clusters of inexpensive computers.Such networks typically incorporate heterogeneous plat forms,real-time partitions and custom devices.Therefore,one must strive for a software infrastructure that efficiently combines the nodes to a single,unified resource for the user,Overall requirements for such middleware are high efficiency and configuration flexibility. Intelligent I/O(I2O) is an industry specification that defines a unifrom messaging format and executing model for processor-enabled communication equipment.Mapping this concept to a distribulted computing environment and encapsulating the details of the specification into an application-programming framework allow us to provide run-time support for cluster operation.This paper gives a brief overview of a framework.XDAQ that we designed and implemented at CERN for the Compact Muon Solenoid experiment‘s prototype data acquisition system.     

Readout electronics testing of the CMS Tracker modules with LT setup

The tracking part of the CMS detector will be built with ∼16000 silicon detector modules, and kept at −10°C for the ten years of the operation of the LHC. All the model materials need to be verified of having a good performance at this low temperature, before their installation into the CMS Tracker. In order to track performance quality, assurance tests are done with two different systems. Of the two setups used, the LT system module is the one that is used to identify whether the performance of readout electronics and leakage current flowing on the silicon sensors is affected by low temperature. In this paper a detailed layout of the CMS TOB modules and their front-end hybrids are presented. In addition, the LT testing results of the 190 TOB modules that were produced and tested in 2004 by the FNAL-CMS group are given. The text was submitted by the author in English.     

Electroweak Physics from the CMS Experiment at the LHC

Physics of Atomic Nuclei - The results obtained in the CMS experiment at the Large Hadron Collider (LHC) by studying electroweak interaction are surveyed.     

基于微型光谱仪的多参数水质检测微系统设计与实验

针对水资源环境监测与保护的需求,提出了基于微型光谱仪连续光谱分析的多参数水质检测微系统,系统主要由MOEMS微型光谱仪、流路系统、多功能微小型样品反应检测室和嵌入式测控系统组成,具有自动进样和试剂、样品反应体系的自动恒温、搅拌、光谱检测和数据处理等功能。论文介绍了系统各主要部分的功能与结构,研制出了原理样机,经实验测试验证,研制的多参数水质检测仪能够快速实现多个水质参数的准确检测,满足水质多参数在线监测的应用技术要求,同时具有很大的功能扩展性。     

非线性伏安特性实验数据处理的研究

用FD-UI-A非线性元件伏安特性实验仪测量了普通二极管和稳压二极管伏安特性,研究了用软件处理非线性数据的过程.研究结果表明,普通二极管和稳压二极管的伏安特性呈现出非线性,但其-呈良好的线性关系,其斜率反映了二极管材料的导电特性.     

稳压二极管的非线性伏安特性研究

用FD-UI-A非线性元件伏安特性实验仪测量了稳压二极管的正向和反向伏安特性,研究结果表明,稳压二极管的正向和反向伏安特性都呈现出非线性,但其正向和反向的lnI-Ud呈良好的线性关系,其斜率反映了二极管材料的导电特性.     

提高物理实验课教学质量探析

在物理实验教学中,存在学生学习目的不明确,依赖心理强,缺少恒心,没有科学态度等问题。解决问题的方法是提高学生做实验的兴趣和改进实验教学方法。     

The CMS muon system: Physics performance

The European Physical Journal C - The CMS experiment will take data at the CERN LHC starting from 2007. The CMS muon system has been designed to identify, reconstruct and measure muons with high...     

激光监听实验的开设与研究

本文介绍了综合、设计性实验——激光监听实验的开设过程,以及对影响实验效果若干因素的研究。     

物理实验数据的线性与非线性拟合

Origin是一款制图和数据处理功能强大的应用软件。本文结合大学物理实验,以实例详细介绍如何利用Origin进行实验数据的拟合分析。包括线性回归拟合、多项式拟合和非线性拟合中的一阶指数衰减拟合。实践证明,利用Origin软件对实验数据进行曲线拟合和分析能够显著提高数据处理效率。     

羊八井ARGO实验数据获取系统

羊八井ARGO实验采用全覆盖式RPC阵列探测小空气簇射事例,其数据获取系统基于多级高速缓存和高速事例驱动机制,硬件实现数据获取和事例组建,从而避免了软件对数据采集速度的影响和CPU的开销,满足了21.7kHz的触发率和6.4M字节/s的数据率的实验要求.     

Heavy ions with CMS: The central region

The potential of CMS as a heavy ion detector is described with special emphasis on the study of the central rapidity region. The detector provides excellent measurements of leptons, photons, gauge bosons, jets and quarkonia. Thus CMS serves as an unbiased detector for Pb+Pb events at $\sqrt {S_{nn} } = 5.5$ TeV.     

刚体转动惯量实验中数据处理的探讨

讨论了刚体转动惯量实验中数据处理过程的缺陷,通过Origin软件改进了数据处理过程,经过计算比较证明了方法改进后数据的精确度确实得到提高。     

应用Excel处理夫兰克赫兹实验数据

应用excel软件快速准确处理了夫兰克赫兹实验数据,避免了大量繁杂的作图工作,得到清晰直观的结果。表明excel软件对辅助处理物理实验数据非常有效。     

Investigation of the Cathode Plane Radiation Damage in the Prototypes of Multiwire Proportional Chamber from the CMS Experiment

Physics of Atomic Nuclei - The new results of cathode surface degradation in muon proportional chambers of CMS after a long-term irradiation with a 90Sr β-source are presented. The data of the...     

物理实验数据的软件处理

通过具体的实验实例,分别详细地介绍了用Excel和Matlab两种软件处理数据的过程,以此为例体现软件处理数据的简便性和准确性.处理过程基本涵盖了常用的数据处理要求和涉及到的相关软件命令,可为其他实验的数据处理提供详细参考.