直线电机型反应堆控制棒驱动机构电磁结构设计研究

电磁结构设计是电磁型反应堆控制棒驱动机构设计的核心环节。本文提出了一种适用于控制棒驱动机构的圆筒型直线电动机。首先,描述了该类电机的基本电磁结构,其次,采用解析计算的方法,推导了可行的极槽数配合,分析了一种新型集中绕组结构。然后,采用二维有限元的方法,对极槽配合、绕组结构形式和电磁结构尺寸等影响机构性能指标的关键因素进行了深入研究,并基于研究成果开展了电磁结构详细设计和试验验证等工作。试验结果表明,直线电机型控制棒驱动机构电磁结构设计合理,可按照控制指令实现提升、下插、保持和落棒等基本功能,提升力、跟随特性和落棒性能等技术指标均可满足设计要求。      

EASTICRF天线真空馈口热-结构分析

真空馈口是ICRF天线中的一个重要部件,它对ICRF天线起真空密封作用。鉴于真空馈口的重要性和安全性,运用有限元方法对两种形式的真空馈口进行了热和热-结构分析,给出了两种形式的真空馈口上的温度分布和应力分布。结果显示：镀银的真空馈口上的温度变化和应力均小于未镀银的真空馈口上的温度变化和应力,但两种形式的真空馈口上的应力均小于材料的许用应力。分析结果验证了真空馈口结构设计的可行性和安全性。     

INET-5MW区域供热模式堆的启动研究(英文)

介绍了INET-5MW反应堆,给出了此堆的热工水力设计参数及主要特性,分析了其启动过程及热工水力不稳定性对此过程的影响。INET-5MW反应堆启动的主要困难是从常压到正常工况要经过不稳定区域。为了避开不稳定性,我们认为启动过程应分为两个阶段。本文给出了三种启动方案的由DACOL程序计算的结果,并进行了对比分析。同时,对每个方案检查了是否可能产生不稳定性。结果表明,这三个方案的启动过程均未发生不稳定现象。因此,可以认为INET-5MW反应堆可以安全稳定地达到运行工况。最后,本文给出了不稳定性对低温核供热堆沸水方式启动影响的几点结论。     

重力驱动及重力注硼系统研究

重力驱动系统是非能动系统的主要类型,具有安全、经济、可靠性高等多项优点,发展潜力很大。本文对非能动系统和重力驱动系统的研究现状进行了综合分析。结合各国重力驱动系统的结构,探讨了各国设计研究的特点。介绍了重力注硼系统的结构,并与国外设计进行了对比分析,指出了重力注硼系统在结构设计上的突出优势及在非能动系统发展过程中的重要地位。     

控制棒驱动机构用电磁轴承本体电磁结构设计研究

电磁结构设计是控制棒驱动机构用电磁轴承本体设计的核心环节。为了获得合理的电磁结构,针对不同磁通分布形式进行了电磁结构选型,建立了用于电磁分析的解析模型和有限元模型;然后采用有限元仿真分析的方法确定了电磁轴承的工作点,并对电流刚度和位移刚度等电磁轴承关键性能参数进行了深入分析研究;最后采用有限元仿真分析结果与解析计算结果对比的方式进行了互算验证。验证结果表明,控制棒驱动机构用电磁轴承本体电磁结构设计合理,各项性能指标均可满足设计要求。      

ITER中国液态锂铅实验包层模块结构热应力数值模拟

使用有限元程序对中国向国际热核实验堆ITER实验包层工作组提交的双功能锂铅实验包层模块(DFLL-TBM)的两种结构设计方案即双冷LiPb包层DLL和单冷准静态LiPb包层SLL进行热应力数值模拟,在包层结构设计、热工水力学设计和中子学计算基础上,给出包层结构温度场和应力场分布,依据ITER高温结构设计标准,进一步对包层高温部件进行力学性能分析.根据这些模拟结果,分析两种结构基本设计方案的合理性和可行性,并作为进一步优化分析的基础.     

INET-5MW区域供热模式堆的启动研究

介绍了INET-5MW反应堆,给出了此堆的热工水力设计参数及主要特性,分析了其启动过程及热工水力不稳定性对此过程的影响。INET-5MW反应堆启动的主要困难是从常压到正常工况要经过不稳定区域。为了避开不稳定性,我们认为启动过程应分为两个阶段。本文给出了三种启动方案的由DACOL程序计算的结果,并进行了对比分析。同时,对每个方案检查了是否可能产生不稳定性。结果表明,这三个方案的启动过程均未发生不稳定现象。因此,可以认为INET-5MW反应堆可以安全稳定地达到运行工况。最后,本文给出了不稳定性对低温核供热堆沸水方式启动影响的几点结论。     

基于TEM喇叭的辐射波模拟器天线辐射性能研究

研究了基于TEM喇叭天线的辐射波模拟器天线性能,分析了天线性能参数如结构角、天线长度、宽高比等对天线辐射性能的影响。为了提高天线低频辐射能力,提出了2种增加天线有效长度的方法,结果表明两种方法均在一定程度上对辐射场波形有所改善。在天线长度的选择符合工程实际的条件下,通过选择合适的宽高比和增加天线有效长度的方法取得了较好的场波形。     

热室模块支撑旋转装置研制

本文介绍了为串列加速器工程中带放射性靶源模块的维修、试验而专门设计的一套定位装置。技术要求模块能够实现升降、旋转功能及精确定位。设计了旋转筒、支撑筒结构,采用螺杆提升装置实现升降功能及精确定位;周向采用电动粗定位及手动精确定位相结合,采用传感器位置检测,气缸定位销设计方案,措施安全可靠。经试验,各项技术指标均满足目标要求,验证了装置设计方案的合理性和可靠性。     

低温供热反应堆模拟启动实验研究

本文介绍了低温供热反应堆启动的实验研究结果,描述了两相流稳定性对低温自然循环沸水反应堆启动的影响,提出沸水启动要经过压水启动和压水向沸水转换两个过程来实现。研究了三种从压水向沸水转换的方法。在此基础上,提出了用小功率,小过冷度从压水向沸水转换的过渡方案,此方案可保证在整个启动过程中流动的稳定。     

EASTICRF天线电流带电磁分析

为了实现EAST托卡马克1000s以上的稳态先进模式运行的最终物理目标,两电流带双环共振(RDL)离子回旋共振（ICRF）天线被选择用来加热,电流带是ICRF天线关键部件,它通过近场区的耦合把能量传输到等离子体中。本文通过有限元方法对电流带在等离子体破裂和等离子体垂直位移事件两种工况下进行了电磁计算,给出了电流带感应电流密度大小分布情况、磁感应强度大小分布情况以及电流带所受的电磁力。利用电流带所受的电磁力作为载荷对电流带进行了结构分析,分析结果为验证电流带结构的可行性提供理论依据,分析方法对未来更高功率的ICRF天线电流带进行电磁分析具有一定的借鉴价值。     

Resonant loop system for the KSTAR ICRF current drive

The phased current distribution at current straps for the KSTAR ICRF antenna causes a power imbalance at each strap owing to the mutual couplings between current straps. In order to mitigate the effect of coupling, a decoupler connecting two phased feeding lines are designed based on both a lumped element antenna model and a distributed transmission line model. Though the decoupler parameter is dependent on the loading resistance, which depends on plasma condition, an analysis shows that the decoupling is effective in the wide range of loading resistance assuming the low variation of mutual inductance between straps. A circuit analysis also shows that the RF characteristics of a complex RF transmission system are matched well for the asymmetric antenna current spectrum aiming for a non-inductive current drive of KSTAR. The calibration result of decoupler after installation is also discussed.     

Mechanical design of the second ICRF antenna for EAST

In order to satisfy the requirements of heating plasma on EAST project, 3 MW ion cyclotron range of frequency (ICRF) heating system will be available at the second stage. Based on this requirement, the second ICRF antenna, has been designed for EAST. The antenna which is planned to operate with a frequency ranging from 30 MHz to 110 MHz, comprises four poloidal current straps. The antenna has many cooling channels inside the current straps, faraday shield and baffle to remove the dissipated RF loss power and incoming plasma heat loads. The antenna is supported via a cantilever support box to the external support structure. Its assembly is plugged in the port and fixed on the support box. External slideway and bellows allow the antenna to be able to move in the radial direction. The key components of the second ICRF antenna has been designed together with structural and thermal analysis presented.     

EASTICRF天线真空馈口电特性评估

本文对EASTICRF天线真空馈口进行了相关的电特性分析,获得了真空馈口电场分布、电势分布,以及电压驻波比随加热频率的变化情况,分析结果验证了真空馈口的可行性和合理性,并为真空馈口电特性评估提供理论依据。另外,在相同条件下,运用相同的方法对一种新型结构的真空馈口进行了相同的电特性分析,分析结果验证了新型结构真空馈口的优越性。     

Design of improved compact decoupler based on adjustable capacitor for EAST-ICRF antenna

The Ion Cyclotron Radio Frequency (ICRF) heating antenna on EAST adopts a decoupling device to constrain power coupling among the radiation straps, which was discovered shortcomings such as long size, poor contact, and etc. In order to improve these weak points, a new type decoupler with terminal-loaded tunable capacitor is designed to replace the previous design. Besides the capability of the tunable admittance parameters of decoupler, the withstand voltage of the capacitor is the most significant consideration for working under high power. Therefore, the theoretical analysis carefully elaborates the capacitor withstand voltage, and the detailed analytical equations and criteria for design are given. After the comparative analysis of theoretical calculation and 3D simulation results, the decoupler design scheme is finalized. The capacitor-loaded decoupler has been successfully adopted for ICRF antenna at port N on EAST, and achieved the optimization of adjacent port isolation from −22 to −58 dB at 37 MHz without plasma to restrict mutual coupling. The new design of the decoupler has greatly improved its compactness and automatic adjustment performance, and could be good solution for the decoupling network of ICRF antennas.     

EASTICRF天线法拉第屏蔽的热-结构分析

在EASTICRF天线中,法拉第屏蔽是ICRF天线中的一个非常重要的部件。实验时,它位于真空室内直接面对等离子体,将承受着很大的热负荷。基于EASTICRF天线法拉第屏蔽结构的安全性,本文利用有限元的方法,首先对热负荷最大的法拉第屏蔽冷却管道在不同水流速下进行热分析,考察在不同水流速工况下法拉第屏蔽冷却管道上的温度分布情况,再通过热 结构耦合方法对法拉第屏蔽冷却管道进行结构分析,了解法拉第屏蔽在不同水流速下的应力大小和分布情况,分析结果为未来EASTICRF天线实验提供理论指导。另外,对法拉第屏蔽冷却管道结构进行了优化改进,并对优化改进后的法拉第屏蔽冷却管道在相同工况下进行了热和热 结构分析,分析结果确定了优化改进后的法拉第屏蔽冷却管道结构的优越性,分析数据为未来法拉第屏蔽冷却管道的优化改进提供理论指导,分析方法为其他同类装置提供有益的参考。     

Recent ICRF coupling experiments on EAST

Recent ion cyclotron resonance frequency(ICRF) coupling experiments for optimizing ICRF heating in high power discharge were performed on EAST. The coupling experiments were focus on antenna phasing and gas puffing, which were performed separately on two ports of the ion cyclotron resonance heating(ICRH) system of EAST. The antenna phasing was performed on the I-port antenna, which consists of four toroidally spaced radiating straps operating in multiple phasing cases; the coupling performance was better under low wave number ∣k_‖∣(ranging from 4.5 to 6.5). By fuelling the plasma from gas injectors, placed as uniformly spaced array from top to bottom at each side limiter of the B-port antenna, which works in dipole phasing, the coupling resistance of the B-port antenna increased obviously.Furthermore, the coupling resistance of the I-port antenna was insensitive to a smaller rate of gas puffing but when the gas injection rate was more than a certain value(1021 s~(-1)), a sharp increase in the coupling resistance of the I-port antenna occurred, which was mainly caused by the toroidal asymmetric boundary density arising from gas puffing. A more specific analysis is given in the paper.     

The Upgrade of Fast Ferrite Tuning Matching System for ICRF in EAST

The fast ferrite tuning (FFT) real-time matching system has been designed and tested for the ion cyclotron range of frequency (ICRF) in EAST tokamak, which is necessary to transfer ICRF power to the plasma against variations in the antenna impedance. Through the test results, we proved this FFT system is feasible in EAST. Therefore this system have been upgraded recently to achieve real-time matching by the upgrading of the coil power supply and optimizing of the tuning structure. Finally the new FFT system achieved a response time of 10 ms and operated with a peak power of 1.5 MW, which satisfied the requirements of matching system in EAST.     

EAST离子回旋波加热快速阻抗匹配系统的研究

离子回旋波加热是EAST装置最重要的辅助加热方法,在实验中获得了明显的加热效果。射频功率源与天线负载之间阻抗匹配才能保证最大的加热功率输出。在射频加热实验中,等离子体参数的改变将会引起天线负载阻抗的快速变化,为应对这一情况研制出了快速阻抗匹配系统。本文采用解析法和计算机仿真相结合的分析方式,研制了该阻抗匹配系统的铁氧体匹配支节,并对其性能进行了测试。测试结果表明,快速阻抗匹配系统的时间响应速度明显优于传统匹配方式的,可作为实时匹配的候选者。