100MeV电子直线加速器激励系统

本文描述了100MeV电子直线加速器微波激励系统的原理、结构、测试结果和主要技术性能。该系统由中功率速调管输出脉冲功率15kW,经微波输出部分将功率分为六路去激励六个高功率速调管。结果表明,系统结构简单,性能良好,完全满足加速器的使用要求。     

速调管管体温差保护装置的研制与应用

速调管是直线加速器系统重要的分系统之一。它是加速器的功率源,加速器的微波功率就是通过速调管放大输出的,因此,速调管的工作状态直接影响加速器的正常运行。速调管工作时,良好的束流聚焦状态非常重要,否则,会引起速调管输出功率下降,甚至会损坏速调管。为了间接判断速调管的     

Application of Hybrid K-edge/X-ray Fluorescence Densitometry in Purex Process Experiment

速调管是直线加速器系统重要的分系统之一。它是加速器的功率源，加速器的微波功率就是通过速调管放大输出的，因此，速调管的工作状态直接影响加速器的正常运行。速调管工作时，良好的束流聚焦状态非常重要，否则，会引起速调管输出功率下降，甚至会损坏速调管。为了间接判断速调管的束流聚焦状态，用两台温控仪测量速调管管体入口和出口水温是简单直观的方法。     

10MeV大功率电子辐照加速器微波系统研制

10MeV大功率电子辐照加速器是采用行波加速结构的电子直线加速器。微波系统是它的重要组成部分之一，该系统包括微波的产生、传输、监测及保障速调管和波导窗安全可靠运行的驻波比快速成保护装置和保证微波系统稳定工作的充气装置。本系统采用高稳定度的晶振锁相式信号源和350W固态功率放大器作为高功率放大器一速调管的激励级，速调管工作中心频率2856MHz，带宽1MHz。     

功率射频研究试验系统研究进展

高功率射频技术是强流加速器技术的基础。建立高功率射频研究实验系统,为的是进行高功率射频元件、射频材料和射频测量技术研究,解决强流加速器射频系统的关键技术与设备,推动强流加速器的发展。 射频研究试验系统主要由稳定射频激励源、速调管放大器、高压脉冲调制器、水冷系统、波导传输系统、大功率测量装置和低功率监控装置组成。 系统的方案设计已完成。现已完成了稳定射频激励源设计。该激励源由稳频信号源和固态功率放大器组成。工作频率2856MHz,8h内的频率稳定度5×10-7,输出脉冲功率大于350W,脉冲宽度18μs,脉冲重复频率450～650Hz。射频激励源已按设计要求外协加工。     

CRAFT LHCD速调管激励源综合测试系统设计

针对聚变堆低杂波电流驱动系统速调管激励源功能特性多样的特点和微波组件繁多的问题,设计了具备多参数测量和自分析诊断能力的速调管激励源综合测试系统。该系统的测量部分能够对速调管激励源输出微波信号的频率特性、开关特性、功率特性和移相特性进行实时检测;其控制诊断部分的设计基于PXI系列工控硬件和Qt集成开发环境,能够对测试过程进行全局规划调度、数据采集存储和智能故障诊断,并能生成测试报告。实际运行表明,该综合测试系统可以24 h连续无人化工作,提高了速调管激励源的测试和故障诊断效率。     

SSRF 150 MeV直线加速器的能量稳定系统设计及仿真

注入束流的能量稳定性和能散度对电子储存环的性能影响很大,通过从SSRF(上海同步辐射装置)上采集数据,研究了直线加速器的能量稳定性,结合国内外相关经验及150 MeV直线加速器自身特点,设计了直线加速器的能量稳定系统方案,利用增强器低能输运线上BPM(beam position monitor)信号进行能量反馈,通过模糊控制器调节速调管输出相位,将束流能量稳定在期望值±0.2%内。用Matlab中Simulink动态链接库建立RF系统模型,进行了系统仿真,仿真结果表明该系统可以较好地抑制能量的长期漂移。     

新型电子直线加速器测试与改进

一种新型的省略电子枪的小型直线加速器被研制成功。高功率速调管的用毕束流被引出作为注入电子,从而取代了传统的电子枪部分。装置在调试完成后开始运行,我们对获得加速后的电子束性能做了初步测量,并与模拟结果进行了对比。结果表明,加速器输出流强远低于设计目标。运用Parmela程序详细分析了电子束流损失的主要因素,针对减少束流损失,提高加速器输出流强,提出了新的改进方案。通过计算分析,得出了该方案良好的可行性。     

多能量双束线电子直线加速器研制

<正>研制了可输出电子能量为7.5、10、12 MeV的电子直线加速器,7.5 MeV电子束打靶产生的X射线用于食品辐照技术研究,10 MeV电子束用于科研教学和中试生产研究,12 MeV电子束主要应用于半导体材料辐照改性研究,多能量双束线电子直线加速器主体结构如图1所示。该电子直线加速器布置采用上下两层结构,电子枪、加速管、速调管、微波系统和脉冲变压器等置于第2层     

10MeV大功率辐照加速器研究进展

10 MeV辐照加速器输出电子束能量10 MeV,平均束流功率达20 kW。由于高流强、大功率,对加速器的总体和一些关键部件如加速管、速调管、调制器、电子枪等提出更高的要求。经充分的预研、设计与计算,完成了加速器总体结构与各分系统的工程设计。总体采用立式机架,束流由上往下传输     

国产45MW速调管实验研究

对45MW实验速调管的电子枪、谐振腔和聚焦磁场结构设计进行了优化研究与测试分析,并对实验管进行了高功率测试分析,以检验设计方案的可行性与合理性。在300kV高压下,输出脉冲功率达45MW,其重复频率12.5Hz,脉宽为2μs,效率约42%,增益约49dB。速调管电子枪导流系数约为2.05μp,与电子枪的理论设计基本吻合。从输出功率与电压的关系来看,速调管谐振腔与聚焦磁场的设计与优化可满足国产45MW速调管的需要。     

Analysis and optimization of high-power pulse transformer for SXFEL

A C-band accelerator structure was used to accelerate electrons at the Shanghai soft X-ray free-electron laser test facility(SXFEL-TF) in Shanghai Institute of Applied Physics(SINAP). The microwave system of this accelerator structure used a 110 MW pulse modulator and a klystron(PV-5050) to provide the power supply. A pulse transformer is a crucial device in a modulator klystron system and plays significant roles in voltage level transformation, matching impedances, and polarity inversion.This study presents the optimization of a high-voltage pulse transformer. The design considerations of reducingflattop ringing and flattop droop, and shortening leading edge are provided. The model simulation, mechanical design, and the relevant experimental results are also presented.     

Development status of KSTAR 5 GHz LHCD system

A steady-state lower hybrid current drive (LHCD) system is under development for advanced tokamak experiments of the Korea Superconducting Tokamak Advanced Research (KSTAR) device. The KSTAR 5 GHz steady-state LHCD system is being designed to couple an input power of 2 MW for 300 s generated by four 5 GHz klystrons. For the development of this system, there are two critical issues. One is the development of a 5 GHz CW klystron for the RF source of the system. The other is the design of a steady-state LH launcher with active water cooling. In this paper, the current status of the development and design for the KSTAR steady-state LHCD system is described. For the LHCD system, aiming at a basic experimental study of 5 GHz LH wave propagation and operational experience with an LHCD system, the installation of an initial LHCD system with a capacity of 0.5 MW for 2 s is scheduled in 2010 using a 5 GHz prototype klystron and an un-cooled 1 MW launcher. The design and progress for the initial LHCD system are also presented.     

Evaluation of mean time between accidental interruptions for accelerator klystron systems based on the reliability engineering method

Frequent beam trips as experienced in existing high-power proton accelerators may cause thermal fatigue in Accelerator-Driven System components. In order to overcome the beam-trip problem, the beam-trip frequencies were estimated based on operational data on existing accelerators. However, there are at least three methods to calculate the mean time between accidental interruptions (MTBI) for one of the accelerator components, the klystron system. In this study, the four types of MTBI for the klystron systems of an electron/positron injector linear accelerator at the High Energy Accelerator Research Organization were compared based on the same operational data. In the analysis, the stop events of the klystron systems were classified, and the MTBI for the klystron systems was calculated using the Kaplan–Meier (KM) estimation, which is a representative non-parametric reliability method. As a result, the mean value of the MTBI found by the KM estimation was 57.3 ± 6.5 hours. On the other hand, the mean values of the MTBI found by the three traditional methods were 30.9 ± 2.4, 32.0 ± 2.3, and 50.4 ± 5.9 hours. The mean values for the ratios of the MTBI found by the KM estimation, to the MTBI found by the traditional estimation, were 1.67 ± 0.07, 1.58 ± 0.06, and 1.14 ± 0.01, respectively. Although these results are obviously different from traditional results, it appears that the present estimation is suitable for the MTBI for accelerator components.     

50MW速调管脉冲调制器的PLC控制

介绍了合肥同步辐射光源(HLS)50MW大功率速调管脉冲调制器改造项目。在该项目中,采用可编程控制器(PLC)监控系统取代了原有的基于继电器逻辑电路的监控系统,使其成为HLS基于先进的控制软件EPICS的新控制系统的一部分;采用恒流逆变充电电源取代了原来的工频高压电源,使调制器技术更先进、运行更加可靠。本文给出了调制器PLC控制系统的设计方法和软硬件的实现及运行情况。     

改进电子直线加速器束流品质的新方法

简单介绍了自适应前馈控制的工作原理、具体实现及其在速调管、微波枪和加速管上的应用,并对实现热阴极微波枪这种时变、非线性、大迟滞系统的控制作了重点介绍。     

Precision Phase Adjustment of a Linear Accelerator High Power Waveguide Feed Network

Each klystron of the SLAC accelerator feeds four consecutive 10-foot accelerator sections through approximately 25 feet of earth shielding. The high power waveguide network which divides and guides the power to the four sections is adjusted so that the rf waves traveling within the accelerator sections are, at the end of each section, phased within ± two degrees of an ideal wave traveling at the velocity of light. A modulated reflection technique is used to compare the electrical phase length from a single input port through the four arms of the network during adjustment. The inclusion of the previously tuned accelerator sections in the network allows the total phase error to be minimized if careful control is exercised over the section terperatures. The measuring system, the reflection modulators, and the possible errors involved are discussed.     

NSRL储存环相干谐波自由电子激光实验总体布局

国家同步辐射实验室(NSRL)正在开展储存环相干谐波自由电子激光研究,目标是获得266nm相干辐射输出,并且获得较高的相干增强因子。给出实验的总体布局,包括电子束、种子激光及光学速调管的性能,介绍了种子激光扫描聚焦系统、同步系统、光学速调管磁极间隙控制系统、磁场测量系统及辐射测量系统。     

NSRL 200MeV电子直线加速器的速调管真空保护装置

报道了一种能保护高功能速调管安全的速调管真空保护装置。该装置保护动作时间≤１５ｍｓ，在强电磁干扰速调管走廓中能稳定可靠地工作。     

Reconstruction of -35 kV／200 kW HVPS for Test of Klystron Units in LHCD System

The paper introduces the -35 kV/200 kW high voltage power supply (HVPS) which is specially used to test klystron units in LHCD system. The new klystrons must be tested under high voltage level before operation and the old klystrons which have worked for a longtime must be exercised by HVPS in lower hybrid current drive (LHCD) system. As the former HVPS has some shortages in engineering design and operation design, the HVPS has to be modified and rebuilt by adopting new method and technology to solve existing bottle-neck problems.