排序方式: 共有98条查询结果,搜索用时 78 毫秒
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杨宇晴 张新军 赵燕平 秦成明 程艳 毛玉周 杨桦 王健华 袁帅 王磊 琚松青 陈根 邓旭 张开 万宝年 李建刚 宋云涛 龚先祖 钱金平 张涛 《等离子体科学和技术》2018,20(4):45102-111
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. 相似文献
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The ion cyclotron resonance of frequency heating(ICRH) plays an important role in plasma heating.Two ICRH antennas were designed and applied on the EAST tokamak.In order to meet the requirement imposed by high-power and long-pulse operation of EAST in the future,an active cooling system is mandatory to be designed to remove the heat load deposited on the components.Thermal analyses for high heat-load components have been carried out,which presented clear temperature distribution on each component and provided the reference data to do the optimization.Meanwhile,heat pipes were designed to satisfy the high requirement imposed by a Faraday shield and lateral limiter. 相似文献
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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。 相似文献
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提出了一种基于LDA模型以及信息熵的文档自动摘要技术,即通过LDA模型对文档进行浅层语义分析,得到文档的主题分布以及不同主题下的词语分布;通过对主题的分析,可以得到最能代表文档中心思想的主题,以及该主题下的词语分布。同时,提出了一种新的基于信息熵的度量句子重要性的方法,并将该方法应用于文档的关键句抽取过程中。该方法将文档中句子的出现看成一个随机变量,通过对随机变量建模并度量它的信息熵来选取文档中的关键性语句。实验结果表明,应用主题模型与信息熵摘取的文档摘要能有效地从文档中摘出中心句。 相似文献
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In order to develop a high-voltage power supply (HVPS) with high quality parame- ters, not only its electrical circuit but also its structure should be studied in detail. In this paper, the structure design of the collector power supply for gyrotron is discussed first. Then the electri- cal field and potential simulations of its inain devices are analyzed. Finally, relevant calculations and conclusions are given. 相似文献
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Power deposition profiles generated by Ion Cyclotron Resonance Heating (ICRH) in non-circular tokamaks are studied using a ray-tracing technique. The simulation results for the Experimental Advanced Superconductor Tokamak (EAST) D-shaped plasma are presented. It is indicated that the spatial distributions of plasma parameters (plasma density, species temperature, minority ion concentration, etc.) have an significant influence on the power deposition profiles. The findings may be highly useful to the planned plasma heating and experiments in EAST. 相似文献
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A method of current drive with Ion Cyclotron Range of Frequency (ICRF) on Experimental Advanced Superconducting Tokomak (EAST) is described. A variety of liquid silicon oil heights in the phase shifter will bring the phase difference to the current drive. It is found that the current drive can be achieved by using the phase shifter. The liquid phase shifter is one of the impedance matching systems too. 相似文献
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