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鉴于EAST ICRF天线真空密封性和基于实验移动的要求,可移动支撑被设计用来支撑ICRF天线前部重量。通过理论计算公式对天线支撑结构进行计算,给出了不同截面尺寸、不同移动距离下支撑杆应力和变形情况。用有限元分析方法进行分析,分析结果和理论公式计算结果非常相近,满足设计要求。计算结果为支撑杆优化设计提供理论指导,计算方法为同类装置的支撑结构提供有益的借鉴。     

EAST ICRF天线法拉第屏蔽的电磁分析

法拉第屏蔽是EAST 装置 ICRF天线的一个重要部件。鉴于法拉第屏蔽的结构安全性,通过运用有限元方法和公式对法拉第屏蔽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电磁和结构分析,获得了法拉第屏蔽在这两种工况下所受的电磁力、应力分布和变形情况。分析结果满足设计要求,并为法拉第屏蔽的结构安全性评估提供理论依据。     

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结合EAST超导托卡马克的物理运行参数,计算给出了装置在等离子体突然破裂时ICRF加热天线上感应电流和电磁力解析式及其随时间变化的曲线图,根据曲线图讨论了电磁力的极限情况和对ICRF加热天线结构的影响。     

EAST离子回旋加热天线传输线结构设计

阐述了EAST离子回旋加热天线传输线的结构设计。用有限元的方法对EAST离子回旋加热天线传输线内导体结构进行了分析,获得了内导体的受力情况。根据内导体的受力情况适当加大波纹管厚度和设计内导体支撑,通过ANSYS分析优化确定了波纹管的厚度和内导体布置的位置。此外,还计算了传输线的热损耗、热变形、电压驻波系数和最大功率容量,计算结果进一步验证了传输线结构的可行性。     

EAST 四条带ICRF 天线的三维电磁场分析

采用3 维电磁场代码CST MWS 对EAST 4 条带的离子回旋(ICRF)天线性能进行模拟研究,分析了天线的耦合阻抗随频率的变化,计算了电流和波谱的分布,模拟研究了不同电流相位对天线的电压击穿打火和引入杂质的影响。计算结果表明：此EAST 的ICRF 天线耦合阻抗和波谱总体设计合理;但天线局部电场较高,当环向电流条带为(0, 0, 0, 0)相位时E_max 为3.61MV•m⁻¹ 超出击穿阈值,经过结构尺寸的优化后E_max 低于阈值。同时表明天线运行时限制器处有较高的RF 电势,当电流相位为(0, π, π, 0)时法拉第屏前10mm 处的RF 电势是(0, 0, π, π)相位时的1/3。     

快波模式转换电子加热

利用全波方法对环形轴对称托卡马克等离子体中快波模式转换电子加热的机理进行了讨论,并针对EAST超导托卡马克上未来ICRF实验中可能的快波模式转换电子加热方案进行了模拟计算,为进一步ICRF实验方案设计优化提供了理论依据。     

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应用有限元分析软件ANSYS建立了EAST装置外杜瓦结构的三维有限元计算模型。在模态分析的基础上,根据《核电厂抗震设计规范》要求设计的地震响应谱作为输入条件,对EAST装置外杜瓦结构进行了地震响应分析计算。计算结果表明,地震动作用下EAST装置外杜瓦的位移和应力响应比较小。依据评判标准,EAST装置外杜瓦结构设计在地震动作用下能满足抗震设计强度要求,能保证装置的抗震安全。     

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介绍了EAST上ICRF辅助加热系统1.5MW射频信号源中工作频率为25～70MHz的末级功率放大器的研制工作,从最优工作参数、输入回路和输出回路三个主要方面详细分析了该级大功率宽频带射频放大器。经比较,分析结果和测试数据显示了很好的一致性,这为实现ICRF加热系统的可靠运行奠定了基础。     

EAST装置离子回旋加热天线电流带热结构分析

介绍了EAST装置新型离子回旋加热(ICRH)天线电流带的设计结构。通过对电流带实际工况的计算得出电流带的工作温度分布,以此来模拟实际工作条件下电流带的热载荷承受能力以及对电流带结构的影响。论证了在实际工况热载荷条件(0.2MW)下,电流带辐射面温度及电流带整体结构强度满足设计要求。     

EAST离子回旋波加热1.5MW射频放大器的研究

介绍了EAST上ICRF辅助加热系统1.5MW射频信号源中工作频率为25～70MHz的末级功率放大器的研制工作,从最优工作参数、输入回路和输出回路三个主要方面详细分析了该级大功率宽频带射频放大器。经比较,分析结果和测试数据显示了很好的一致性,这为实现ICRF加热系统的可靠运行奠定了基础。     

Theoretical analysis of the EAST 4-strap ion cyclotron range of frequency antenna with variational theory

A variational principle code which can calculate self-consistently currents on the conductors is used to assess the coupling characteristic of the EAST 4-strap ion cyclotron range of frequency(ICRF) antenna. Taking into account two layers of antenna conductors without lateral frame but with slab geometry, the antenna impedances as a function of frequency and the structure of RF field excited inside the plasma in various phasing cases are discussed in this paper.     

Features of the repetition frequency of edge localized modes in EAST

This paper presents the features of the edge localized modes (ELMs) observed in the 2010 experimental campaign on the Experimental Advanced Superconducting Tokamak (EAST). The first high-confinement mode (H-mode) at an H-factor of H_{IPB98(y, 2)}～ 1 has been obtained with about 1 MW lower hybrid wave (LHW) heating power on the EAST tokamak. The ELMs in EAST are Type III ELMs with high frequency (several hundred Hertz) and low amplitude. ELM features for the following two types of EAST discharges are investigated: discharges with only LHW and those with both LHW and ion cyclotron resonance frequency (ICRF) wave. The ELMs are observed in a wide q ₉₅ window ranging from 2.6 to 5.0, and the ELM frequencies decrease with the safety factor, q ₉₅. In contrast to most observations, the ELM frequency in EAST appears to be weakly proportional to the power through the separatrix. When the ICRF wave is injected, the ELM frequency increases. The control of the ELM frequency and amplitude has been achieved by puffing impure argon gas into the EAST discharge.     

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The performance of the four strap ion cyclotron range of frequency (ICRF) antenna in EAST was studied by three dimensional electromagnetic code CST MWS. The coupling impedance with various frequencies, the distribution of current on straps and the power spectra for the three types of phases were calculated. The voltage breakdown and ICRF-related impurity were also studied. Simulation results show that the coupling impedance and power spectrum of the antenna design were reasonable, however, highest electric field, which is 3.61MV•m⁻¹ for (0, 0, 0, 0) toroidal phasing at the local area, exceeds the empirical value of breakdown. After the structure size was optimized, the maximum of E-field was below the breakdown value, the results also show that the high radio frequency (RF) potential was close to the antenna limiter, the RF potential along total B-field in front of Faraday screens 10mm for (0, π, π, 0) phasing was one-third of that for (0, 0, π, π) phasing.     

An Algorithm for the Analysis of Inductive Antennas of Arbitrary Cross Section for Heating in the Ion Cyclotron Range of Frequencies

The application of ion cyclotron range of frequency (ICRF) heating to near-ignited plasmas will require launching structures that will be capable of withstanding the harsh plasma environment. The recessed antenna configuration is expected to provide sufficient protection for the structure, but to date no analysis has been done to determine if adequate coupling can be achieved in such a configuration. In this work we present a method for determining the current distribution for the antenna in the direction transverse to current flow and predict antenna loading in the presence of plasma. Antennas of arbitrary cross section are analyzed above ground planes of arbitrary shape. Results from the antenna design code (ANDES) are presented and compared to experimental results.     

快波模式转换效率的理论分析和数值模拟

利用相位积分法, 在传统的布登模型基础上, 考虑了高场侧截止层的影响, 构建了三体模型, 求出了快波通过单一衰减层的传输系数、反射系数和模式转换系数. 在双离子情况下, 模拟的结果与Kazakov等人的结果相符合. 针对EAST实验, 将双离子模型推广至三离子模型, 分析了不同相位、少子浓度、频率和纵场强度对快波模式转换效率的影响, 为未来离子回旋加热实验提供参考. 关键词： 模式转换加热 离子回旋波加热 相位积分