EAST-ICRF传输线驻波电压测量系统设计

为准确测量EAST离子回旋波加热(ICRF)系统中的驻波电压,设计了一款传输线驻波电压测量系统。该系统利用传输线上的电压探针阵列,经检波器、光电隔离器和采集卡接入PC机的数据处理模块,并用LabVIEW数据采集处理软件将采集到的信号进行拟合。测量结果能够清楚地得到各电压探针的电压值,拟合结果具有明显的驻波特性,同时还可以将探针信号作为发射机的保护信号,用于保护发射机安全稳定运行。     

EAST装置ICRF传输线驻波电压保护系统设计

利用EAST装置离子回旋共振加热(ICRF)系统传输线驻波电压探针测量阵列,设计了基于单片机技术的传输线驻波电压保护系统。该系统根据传输线驻波电压分布,设置探针处驻波电压阈值和驻波比阈值,当测量数据超过阈值时,切断微波信号源,有效保护ICRF发射机和传输线系统。     

离子回旋共振加热实验中用于瞬态射频阻抗测量的探针列阵的误差分析

在离子回旋共振加热(ICRH)实验中用于测量瞬态射频(RF)阻抗的探针列阵常常给出错误的结果。本文对此进行了分析,并提出了一种采用定向耦合器和四探针的混合系统来提高测量精度。     

基于FPGA的EAST-ICRF实时监控系统设计

在全超导托卡马克核聚变实验装置(EAST)上进行核聚变试验时,离子回旋共振加热(ICRF)是该试验过程中加热等离子体的主要方法之一,而对发射机、传输线、真空室以及天线中的重要参数进行实时监测是托卡马克装置中ICRF对等离子体进行功率耦合的重要保障。提供了一种采用FPGA的ICRF实时监控系统设计方案、AD9252芯片以及SN74LS14型号施密特触发器进行数据采样,实现对各故障信号的实时显示、报警以及信号源的及时切断,同时利用FPGA可重复编程的特点,便于后期对系统进行维护和升级。     

基于JavaWeb的EAST-ICRF数据查询系统

离子回旋系统(ICRF)是东方超环(EAST)辅助加热和电流驱动手段之一。ICRF数据查询系统对于ICRF实验的深入进行起着至关重要的作用,实验人员使用系统进行在线和离线的数据分析。系统整体采用Java Web开发,使用MDSplus存储ICRF实验数据,具有界面友好、跨平台、安全、稳定等优点。介绍ICRF数据查询系统的设计实现思路,为数据查询系统的设计与实现提供技术上的参考。     

长周期X射线驻波技术及其应用

长周期Ｘ射线驻波是最近几年发展起来的一门新技术，可作为凝固相或液相样品中金属原子层的空间纵深结构探针。可用于蛋白南等生物大分子与底物的相互作用和功能结构，带电表面与电解液的界面结构等领域的研究。     

基于FPGA的EAST-ICRH天线相位测量研究

离子回旋波加热(ICRH)是EAST超导托卡马克核聚变实验装置加热等离子体的重要手段之一,而离子回旋加热天线电流带之间的相位关系影响到天线的加热效果。论文提出了一种基于FPGA的ICRH天线相位测量方案,采用双AD8302模块以及新的算法解决了相位测量的二值性和非线性误差问题,测量精度高。同时利用FPGA可编程的特点,使得系统的设计变得简洁灵活,便于后期功能的扩展。     

用电子回旋加热和电流驱动长脉冲改善TCV托卡马克的中心电子约束

通过用电子回旋加热（ECH）和电流驱动（ECCD）调整电流分布来改善TCV托卡马克的中心电子能量约束。单靠轴上反向ECCD仅以瞬变方式可实现上述目标。用致稳磁流体动力学模的离轴ECH两步步骤和产生平的或反转的电流分布的轴上反向ECCD来获得稳定工况。这种中心温度高达9keV(归一化βN-0.6时）的高约束状态已持续了整个加热脉冲持续时间，或200倍于电子能量约束时间和5倍于电流再分布时间。     

EAST-ICRH发射机宽频阻抗匹配网络的研究及实现

EAST(Experimental Advanced Superconducting Tokamak)是我国开展受控核聚变研究的新一代实验装置,离子回旋波加热(ICRH)是在该装置中加热等离子体的重要手段之一。论文介绍了离子回旋发射机中阻抗匹配网络的原理及实现方法,并采用LabVIEW软件和PLC相结合的方式开发了一套阻抗匹配网络调节系统。     

AST-ICRH天线相位的控制研究

EAST超导托卡马克是我国开展受控核聚变研究的新一代实验装置,离子回旋波加热(ICRH)是在该装置中加热等离子体的重要手段之一.要高效地实现波加热就要很好地控制相位,设计了一套相位控制系统,可以有效地调节加热系统天线的相位关系,从而很好地实现波加热.     

Current Status of ICRF Heating Experiments on EAST

Radio frequency (RF) heating in the ion cyclotron range of frequencies (ICRF) is one of the primary auxiliary heating methods for EAST. The ICRF system provides 6 MW power in primary phase and will be capable of 10 MW later. Three 1.5 MW ICRF systems in a frequency range of 25 to 70 MHz have already been in operation. The ICRF heating launchers are designed to have two current straps with each driven by a RF power source of 1.5 MW. In this paper a brief introduction of the ICRF heating system capability in EAST and the preliminary results in EAST are presented.     

Influence of the Phase of the Antenna Current Standing Wave on the Power Flux in Ion Cyclotron Heating

For ion cyclotron resonance heating, the current on the antenna surface exists in a form of standing wave, and the phase of the poloidal current standing wave affects significantly on the performance of the coupling. In this paper, a coupling calculation is carried out based on a practical model for the loop antenna. The ion cyclotron wave coupling performance depends greatly on the antenna current propagation constant and the phase of standing wave. For a small antenna-current-propagation constant, the antenna coupling performance is more sensitive to a ?/2 change in the phase of standing wave.     

EAST离子回旋系统液态相移器的理论设计

对EAST离子回旋系统液态相移器的原理进行了理论分析和计算,结果表明:利用液态相移器可产生相位差,从而可用离子回旋波进行电流驱动。另外,液态相移器也可与单支节液态调配器结合使用,构成传输线阻抗匹配系统。     

ICRF传输系统的优化数值分析

在开展离子回旋波加热实验时,高驻波电压是高功率射频传输过程中需要解决的主要问题之一。论文基于传输线理论,详细介绍了利用同轴短路或开路支节进行优化射频传输系统的方法,分析计算了支节的接入位置、支节长度、以及支节接入后的传输线电压分布。分析结果表明:传输线射频电压在支节接入后得以大幅降低,系统传输能力得到有效提高,降低了打火的概率。     

EAST离子回旋加热系统高功率射频放大器阳极电源的研制

离子回旋共振加热是EAST超导托卡马克核聚变实验中重要的辅助加热手段。高性能的高功率射频放大器阳极电源对整个加热系统的稳定运行起重要作用。本工作设计了基于脉冲阶梯调制（PSM）技术的阳极电源及其控制保护系统,通过采集电源的实验数据对电源的设计进行了验证。实验结果证明,本阳极电源的设计和参数选择均是合理正确的,电源的开通和关断以及控制保护的数据指标完全达到设计要求。     

Measurement of Ion Cyclotron Emissions by Using High-Frequency Magnetic Probes in the LHD

Two pairs of high-frequency magnetic probes were installed in the Large Helical Device (LHD). During the injection of a perpendicular neutral beam, ion cyclotron emissions (ICEs) with the fundamental frequency corresponding to the ion cyclotron frequency at the plasma edge were detected, which are the same type of ICE as measured with the former spare ion cyclotron range of frequencies (ICRF) heating antennas. This type of ICE was further investigated with regard to the phase and intensity of signals. Another type of ICE was found in the LHD, and these ICEs were synchronized with bursts of toroidicity induced Alfv¶en eigenmodes (TAE) and the rise of intensity of lost ion °ux. Therefore the source of these ICEs was thought to be the particles transferred from the core to the outer region of plasma by the TAE bursts. The frequency of ICEs induced by the TAE bursts increases linearly with the magnetic ¯eld strength, since the ion cyclotron frequency increases with the magnetic ¯eld strength.     

The Influence of Neutral Beam Injection on the Heating and Current Drive with Electron Cyclotron Wave on EAST

Both neutral beam injection(NBI) and electron cyclotron resonance heating(ECRH) have been applied on the Experimental Advanced Superconducting Tokamak(EAST)in the 2015 campaign. In order to achieve more effective heating and current drive, the effects of NBI on the heating and current drive with electron cyclotron wave(ECW) are analyzed utilizing the code TORAY and experimental data in the shot #54411 and #54417. According to the experimental and simulated results, for the heating with ECW, NBI can improve the heating efficiency and move the power deposition place towards the inside of the plasma. On the other hand, for the electron cyclotron current drive(ECCD), NBI can also improve the efficiency of ECCD and move the place of ECCD inward. These results will be valuable for the center heating, the achievement of fully non-inductive current drive operation and the suppression of magnetohydrodynamic(MHD) instabilities with ECW on EAST or ITER with many auxiliary heating methods.     

Design of the Eelectron Cyclotron Resonance Heating Transmission System for HL-2A

HL-2A will be equipped with a 75 GHz/1 MW/ls electron cyclotron resonance heating (ECRH) system. The paper describes the design of the transmission system, which is made up of a transmission line, an equatorial launcher and a measureing system. The paper describes in detail the design of main components of the system such as, waveguides, ellipsoidal surface mirrors, chemical vapor (CVD) diamond window, steering mirror, and new directional coupler with a k-spectrometer. The newly-designed launcher can make the beam steer poloidally to deposit energy in different locations.