大亚湾RPC电子学系统USB光纤传输测试板设计

主要介绍了应用于大亚湾反应堆中微子振荡实验RPC电子学系统中的USB光纤传输测试板,它主要用于测试光纤传输性能以及模拟、VME插件功能,以便在工程中期可以对其他部分进行测试.文章内容包括板子的硬件设计,FPGA的主要逻辑设计,光纤部分的测试以及工程测试小系统的建立.目前该USB光纤传输测试板已经用于RPC电子学系统研制的测试检验.     

大亚湾RPC探测器电子学读出插件原型机设计

介绍了大亚湾(Daya Bay)反应堆中微子振荡实验RPC探测器电子学中基于FPGA的读出插件原型机(ROM-USB)的设计,其中包括该原型机的设计构想、硬件结构以及FPGA内部逻辑的实现.现在ROM-USB已经在RPC探测器及其前端电子学板(FEC)的复制过程中得到应用.     

PSpice程序在阻抗板室探测器研制中的应用

研究提出了阻抗板室（RPC）探测器的电子学模型。基于该模型，通过PSpice程序对RPC探测器的电子学读出信号进行了模拟，模拟结果与实验数据和相关的研究结果一致。通过PSpice模拟，能预测RPC探测器的物理性能，为指导RPC探测器的研制提供了一种有效的优化手段。     

ALICE/PHOS前端电子学板基线漂移和能量分辨率研究

ALICE/PHOS实验控制单元由RCU升级为SRU,实现更稳定的远距离点对点控制读出以及每块前端电子学板20MB/s的读出速率。结合新研制生产的90块前端电子学板在SRU系统下的测试结果,着重分析了SRU读出控制方式以及电子学板信号链路的测试结果,评估了基线漂移的影响并由大量测试结果表明,现行设计的前端电子学板满足电子噪声小于5MeV的能量分辨率要求。     

大亚湾实验RPC探测器信号读出前端板的高精度甄别阈的设计

介绍了大亚湾中微子振荡实验中阻性板探测器RPC(Resistive Plate Chamber)读出电子学前端板FEC(Front-End-Card)上高精度甄别阈电路的设计原理和相关测试。该电路具有高精度、低的甄别阈值设置能力、好的一致性保障等特点。在介绍该电路设计原理的同时,也给出了相应的检测实验和结果。     

μ子鉴别器电子学系统数据读出插件

在我们所设计的北京谱仪第三代（BESIII）μ子鉴别器电子学系统原型机中,前端电路板（FEC）将采集的阻性板探测器（RPC）信号经由30m长电缆传送到远端的数据读出插件中。该插件实现数据接收、数据压缩、发送控制命令、配置和测试FEC、驱动信号,以及通过USB接口与上位机交互等功能。     

基于ASIC的Si-PIN探测器读出系统

为了实现大面积多通道Si-Pin探测器前端电子学的高度集成,设计了一种基于ASIC技术的电子学读出系统.文章主要介绍了该ASIC芯片的特点以及读出电子学的系统结构和工作原理.我们对电子学系统进行了一些测试,给出了连接Si-Pin探测器得到的Am-241源的能谱图.     

应用于极深地下实验的RPC及其阻抗测试

介绍了一种新型的阻性板室探测器(Resistive Plate Chamber,RPC),其结构适用于极深地下实验。通过同轴线说明特性阻抗对信号传输的影响。同时测量了读出条的特性阻抗值,与引入的计算带状线特性阻抗的经验公式很好的吻合,说明测量RPC读出条特性阻抗的方法是可行的。     

LHAASO-WFCTA多通道数据高速传输方案设计

为解决广角大气荧光/切伦科夫光探测器阵列电子学读出系统板间多通道数据传输问题,设计了一种基于低压差分信号接口的同步串行传输方案,给出了误码率及稳定性测试。测试结果表明,在125MHz时钟频率下,传输误码率小于10~(-12),且具有较高的稳定性,能够较好的满足系统数据传输需求。     

BESⅢ Muon鉴别器前端电子学读出系统

本文介绍了BESSⅢ Muon前端电子学读出系统的结构,详细说明了依据菊花链方式的前端板和基于USB的读出板的设计和实现方法.该系统中较多地采用了FPGA技术,极大地降低了系统的复杂程度和建造成本.文章最后介绍了系统的自检方式,并给出了该系统在北京高能物理研究所谱仪大厅内的宇宙线测试结果,论证了系统的可靠性.     

大亚湾中微子实验RPC电子学读出系统时钟分配插件的设计

介绍了大亚湾( Daya Bay)反应堆中微子振荡实验RPC探测器电子学系统中时钟分配插件的设计,包括了其硬件结构的设计和插件中FPGA芯片固件逻辑的设计.在制作和调试完成之后进行了相关功能和稳定性的测试.     

一种基于RPC的空间μ子探测系统

本文介绍了一种利用ＲＰＣ构成的空间μ子探测系统，描述了ＲＰＣ的工作原理和空间μ子探测系统的结构及其设计。     

Preliminary design of the ITER AC/DC converters supplied by the Korean Domestic Agency

The preliminary design for ITER AC/DC converters under the responsibility of the Korean Domestic Agency is performed on the basis of the engineering experience of previous R&D for a full-scale 6-pulse CS (Central Solenoid) converter unit. This paper describes key features of the preliminary design for the respective sub-systems; integrated self-supporting aluminium structure and symmetrical thyristor assembly for strong and reliable converters, optimised impedance of the converter transformer to limit short circuit current, coaxial-type AC bus bars to shield high magnetic field around wall penetrations, compact components to fit into given building space. The insulation and the minimisation of electrical loops of concrete rebar below the converter installations are essential to prevent floor heating. Required output voltage or current of converters is provided by a conventional controller. A master controller is designed to collect predicted reactive powers from each converter and deliver processed data to the reactive power compensation (RPC) system to improve the regulation speed of the RPC controller with fast feed-forward compensation under fast reactive power transients.     

Mechanical properties of steel fiber reinforced reactive powder concrete following exposure to high temperature reaching 800 °C

This study investigates the stress-strain relation of RPC in quasi-static loading after an elevated temperature. The cylinder specimens of RPC with φ 50 mm × 100 mm are examined at the room temperature and after 200-800 °C. Experimental results indicate that the residual compressive strength of RPC after heating from 200-300 °C increases more than that at room temperature, but, significantly decreases when the temperature exceeds 300 °C. The residual peak strains of RPC also initially increase up to 400-500 °C, then decrease gradually beyond 500 °C. Meanwhile, Young's modulus diminishes with an increasing temperature. Based on the regression analysis results, this study also develops regression formulae to estimate the mechanical properties of RPC after an elevated temperature, thus providing a valuable reference for industrial applications and design.     

Simulation and test results of low-order band harmonic filters to decrease resonance phenomenon in the KSTAR power system

The superconducting magnet power supply which supplies superconducting magnet coil (SC) with the power to generate plasma during a KSTAR experiment for nuclear fusion research is a nonlinear load. Characteristic harmonics are generally produced since it converts AC to DC using 6 or 12 pulsed operation. However, non-characteristic harmonics or inter-harmonics are generated according to output control characteristics. Also, 95% out of the power generated from superconducting magnet coil is reactive power. Therefore, harmonic and reactive power occurring during operation have some bad influences such as voltage drop, voltage distortion and decrease in power factor on the KSTAR power system, and reactive power compensator (RPC) & harmonic filter (HF) system which is able to compensate harmonic and reactive power at the same time was established and has been operated [1]. However, out of non-characteristic harmonics and inter-harmonics caused by output control characteristics of superconducting magnet power supply, the more compensation volume of the RPC & HF system increases, the more voltage distortion with harmonic expansion is caused by harmonics in a low-order band due to the parallel resonance in a low-order band between the KSTAR power system and the RPC & HF system. As a result, it has serious effect on the injection capacity restriction of the RPC & HF system, the unstable operation control of superconducting magnet coil, and the operation of main cooling facilities. This paper presents reasons of the resonance phenomenon of the KSTAR power system and suggests a design plan of additional facilities for stable operation of the KSTAR power system, and proves their effects through the simulation and test results.     

A RPC test station based on ROOT and VME

Due to its advantages in large-area application situations, the RD of the resistive plate chamber(RPC)has always been carried out. A performance test station for RPC RD has been designed and developed based on the VME bus and ROOT in Linux. This system can be customized expediently according to the requirements of different tests, which facilitates detector RD because of its automatic HV scan, especially for long-term test. With this system, we have implemented the RPC performance test,including the efficiency curve, counting rate, dark current and charge and timing resolution.     

核电站反应堆保护机柜失电缺省值分析研究

为了降低反应堆保护机柜(RPC)失电引入的安全风险,红沿河核电站开展了针对RPC失电的缺省值分析工作,论文在简要介绍红沿河核电站数字化仪控系统(DCS)平台的基础上,对RPC失电相关的缺省值分析范围进行了界定,通过实例对其分析原则进行了介绍,对其实现方式及应用进行了说明。该研究对提升DCS本身的可靠性、电站的安全水平和可用性有重要意义。     

Physics Performance of the Barrel RPC System of the HARP Experiment

The physics performance of the barrel RPC system of the HARP experiment is described. In the barrel two sets of fifteen identical resistive plate chambers (RPCs) have been operated in 2001 and 2002 as a part of the HARP experiment at the CERN PS accelerator. For the first time under real experimental conditions RPCs have bean applied for particle identification (PID) by measuring the particle's time-of-flight (ToF). The procedure developed for the RPC calibration, based on reconstructed tracks in the HARP Time Projection Chamber (TPC), is described in detail. Intrinsic RPC time resolutions of 141 ps and a combined time resolution of the large angle TOF system of 180 ps are obtained. The effective resolution of the comparison of predicted and measured ToF is 305 ps in the region of interest for this experiment. The PID capabilities of the system are demonstrated. An average efficiency of the RPC counters of about 97% is measured