共查询到20条相似文献,搜索用时 421 毫秒
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为适应兰州重离子加速器的升级改造需要,对加速器原前端电源控制器进行改造。本文基于双核ARM11突出的事务处理和网络通信能力,采用高精度的专用模数、数模转换芯片实现设计。测试表明:新型磁铁电源控制器输出电压稳定度为4.01×10~(-5),比原前端电源控制器稳定性提升一个数量级,满足了加速器升级电源系统精度要求。 相似文献
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基于ARM7内核和嵌入式系统的VME总线控制器的研制 总被引:10,自引:5,他引:5
简要介绍了一种VME式总线控制器的设计方法。三星公司的S3C4510B是一款采用了ARM7内核的支持网络连接的高性能16/32位RISC处理器,采用它和相关芯片研制出了类似3U的VME总线控制器,嵌入式操作系统为uClinux。该控制器主要给设备总线提供高速网络连接通道,把后台计算机数据库和前端总线设备紧密地连接起来,实现数据的快速获取与给定。 相似文献
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潜在电路分析技术源自于阿波罗登月计划,用于提高关键电路或系统的可靠性。该技术在核电界也得到应用,并取得了一些有价值的成果。第三代非能动安全核电厂的设计引入了对安全重要的爆破阀,因而必须保证爆破阀控制器的高可靠性。为此将潜在电路分析技术引入核电厂爆破阀控制器的设计分析。通过采用人工路径搜索方法对爆破阀控制器的电路进行分析,判明现有设计中存在潜通路,影响到系统的可靠性,并据此提出设计改进的关键点,即在相应回路中增加单向二极管。分析表明改进后的电路无潜通路存在,系统可靠性得到提高。该改进可应用于爆破阀控制器的国产化设计和设计优化。 相似文献
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相衬CT相比传统CT具有巨大优势,本文介绍了相衬CT原理测试装置的控制系统。该控制系统采用上下位机结构。上位机采用跨平台的PyQt框架,通过以太网与下位机通信。下位机由时序控制器、运动控制器、高压电源控制器、联锁控制器等组成,实现对前端设备的控制,协调设备间的工作次序,并提供人身和设备的安全联锁功能。相衬CT原理测试装置现在已开发完成,进行了装置的总体联调与测试。测试过程中控制系统运行稳定,界面友好,达到了设计要求。 相似文献
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数字核谱仪中条件线路的一种最佳实现方法 总被引:3,自引:2,他引:3
根据数字化核谱仪中前端条件线路的要求,设计了改进型Butterworth滤波器线路。与传统的三重实极点滤波线路相比,新设计的件线路具有更优越的性能。 相似文献
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Low-level radio frequency(LLRF) systems stabilize the electromagnetic field in the RF cavities used for beam acceleration in particle accelerators. Reliable, accurate, and precise detection of RF amplitude and phase is particularly important to achieve high field stability for pulsed accelerators of free-electron lasers(FEL). The digital LLRF systems employ analog-to-digital converters to sample the frequency down-converted RF signal and use digital demodulation algorithms to calculate the RF amplitude and phase. Different sampling strategies and demodulation algorithms have been developed for these purposes and are introduced in this paper. This article focuses on advanced topics concerning RF detection,including accurate RF transient measurement, wideband RF detection, and RF detection with an asynchronous trigger, local oscillator, or clock. The analysis is based on the Swiss FEL measurements, but the algorithms introduced are general for RF signal detection in particle accelerators. 相似文献
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Cheng Wang Jian-Hao Tan Xiao-Xia Huang Yi-Xing Lu Lin Wang Wen-Cheng Fang Zhen-Tang Zhao 《核技术(英文版)》2021,32(9):84-93
To further improve the performance of acceler-ators, the first cryogenic normal-conducting RF gun in China was designed and manufactured. As a new and attractiv... 相似文献
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Discovery of superconducting materials that operate at high temperatures revive interest in the use of rf field for plasma confinement [1]. This paper discusses feasibility of a scheme where resonant rf cavities are attached to the mirror ends of an open system for plasma confinement. 相似文献
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A. A. Babkin P. V. Bykov G. S. Krainov G. I. Sil'vestrov V. V. Shirokov 《Atomic Energy》2002,93(6):991-994
A cascade accelerating-voltage generator with inductive coupling and parallel power supply to the cascades is examined. The basic parameters and dimensions of a generator for a voltage of 500 kW and power 10 kW are presented. 相似文献
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环境电磁场自动测试系统 总被引:1,自引:0,他引:1
本文讨论了对环境电磁波区域性背景场强测量使用自动测试系统,该系统由自动频谱分析仪,宽带各向同性天线,计算机等组成,其优点是可靠、快速、方便,为国内开展环境电磁波场强测量提供一部分新的设备。 相似文献
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Photocathode RF gun is widely used for particle accelerators as an electron source.When driving an RF electron gun at the fundamental frequency and a higher harmonic frequency simultaneously with proper field ratio and relative phase,it generates electron beams of ultralow emittance and a linear longitudinal phase space distribution.Such a gun provides high quality electron beam with low energy spread,small traverse emittance and high brightness.In this paper,the RF design of a 1.5 cell cavity is presented.Simulation results of beam dynamics for the two-frequency gun and a standard single-frequency RF gun are also shown in this paper.In addition,bunch compression with a two-frequency gun is explored. 相似文献
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Superconducting rf electron accelerator prototypes have been operated at Stanford University and at the University of Illinois. Many of the beam performance goals for emittance, current, energy resolution and stability have been achieved. Lower-than-expected accelerating gradients have necessitated the reevaluation of the energy objectives. Recirculation of the electron beam through the superconducting linacs will, however, increase the effective accelerating gradient. 相似文献
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