Studies on Self-excited Oscillation of Traveling Wave Direct Energy Converter by Simulation Experiment

行波直接能量转换器自激振荡的仿真实验研究

• 批准号: 18560277
• 负责人: TAKENO Hiromasa
• 金额: $ 2.45万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560277/
• 关键词: Helium 3 Fusion; Direct Energy Conversion; TWDEC

The research project treats self-oscillation of traveling wave direct energy converter (TWDEC), which is desirable for commercialization of electric power generation by nuclear fusion. The project aims at simulating work of self-excited oscillation of TWDEC, and experimental and numerical studies were performed.In the experimental study, an external transmission circuit of decelerator of a TWDEC simulator was arranged by toroidal core and variable capacitor, and self-excited signals produced by modulated beam flowing were examined. Relative gain of the signal to modulation voltage was -75dB, which was lower than the previous experiments. To examine the difference, especially, evaluation of noise components, a dam for flowing beam to the decelerator was settled with keeping the RF environment the same. The signal was measured for various conditions in which the noise components were eliminated by estimating from those without beam flowing. The results revealed the existence of different working modes which was hard to control as it depended on plasma production. The improvement of plasma source is necessary.As for numerical study, a numerical code constructed previously was extended to examine the work of TWDEC. One is supplement of works of external circuit, and the suitable results were obtained in the case of a simple linear transmission circuit. In the next, the spatial structure was extended into two dimension. This enabled to evaluate difference of electric field according to difference of geometry of electrodes, and collision of particle to the electrodes. The other extension is introduction of field due to charge of particles. In the results, however, huge field was performed at the entrance of the beam. This was because of insufficient model of calculation. As field due to charge of particles is essential for precise evaluation of self-excited oscillation, this point is planned to be improved.

本研究计画针对行波直接能量转换器（TWDEC）之自激振荡现象，探讨其应用于核聚变发电商业化之必要性。本课题以模拟TWDEC的自激振荡工作为目的，进行了实验和数值模拟研究，实验研究中采用环形磁芯和可变电容构成TWDEC模拟器减速器的外传输电路，并对调制束流产生的自激信号进行了检测。信号与调制电压的相对增益为-75dB，低于先前的实验。为了检查差异，特别是噪声成分的评估，在保持RF环境相同的情况下，设置了用于使光束流向减速器的屏障。在各种条件下测量信号，其中通过从没有束流的条件估计来消除噪声分量。结果表明，存在不同的工作模式，这是很难控制的，因为它依赖于等离子体的产生。在数值计算方面，我们将以前建立的数值计算程序进行了扩展，以检验TWDEC的工作。一是对外部电路的工作进行了补充，并在简单线性传输电路的情况下得到了合适的结果。其次，将空间结构扩展到二维。这使得能够根据电极的几何形状的差异以及粒子对电极的碰撞来评估电场的差异。另一种扩展是由于粒子的电荷而引入场。然而，在结果中，在束的入口处执行巨大的场。这是因为计算模型不足。由于粒子带电场对于自激振荡的精确评价是必不可少的，因此计划改进这一点。

项目成果

Experiments and Numerical Analyses of Deceleration Process on a Traveling Wave Direct Energy Converter Simulator

行波直接能量转换器模拟器减速过程的实验与数值分析

• 发表时间: 2007
• 作者: D;Omoya.;K;Takada.;H;Takeno.;Y;Yasaka;K. Takada
• 通讯作者: K. Takada

Deceleration Experiment on a Simulator of Traveling Wave Direct Energy Converter for D-^3He Fusion Reactor

D-^3He聚变反应堆行波直接能量转换器模拟器减速实验

• 发表时间: 2006
• 期刊: Journal of the Korean Physical Society Vol.49I
• 作者: T. Yamamoto;K. Takada;H. Takeno;Y. Yasaka;T.Yamamoto;K. Sugihara
• 通讯作者: K. Sugihara

Analysis of Secondary Electrons in a Plasma Direct Converter Simulator for Advanced Fusion

用于高级聚变的等离子体直接转换器模拟器中的二次电子分析

• 发表时间: 2006
• 期刊: Proceedings of the XXIInd International Symposium on Discharges and Electrical Insulation in Vacuum VOL. 2
• 作者: K. Sugihara;T. Yamamoto;H. Takeno;Y. Yasaka;H.Takeno
• 通讯作者: H.Takeno

Studies of Scaling Law on Direct Energy Conversion for Advanced Fusion

先进聚变直接能量转换标度律研究

• 发表时间: 2008
• 期刊: Journal of Plasma and Fusion Research Vol. 84, No. 2
• 作者: H. Takeno;Y. Yasaka;Y. Nakashima;T. Cho;Y. Tomita;M. Ishikawa
• 通讯作者: M. Ishikawa

Optization of Decelerator Structure of Traveling Wave Direct Energy Converter Simulator for D-^3He Fusion

D-^3He聚变行波直接换能模拟器减速器结构优化

• 发表时间: 2007
• 期刊: Transactions of Fusion Science and Technology Vol.51,No.2T
• 作者: H. Takeno;Y. Yasaka;Y. Nakashima;T. Cho;Y. Tomita;M. Ishikawa;竹野裕正;T. Yamamoto
• 通讯作者: T. Yamamoto