权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Direct Measurement of Bounce Ions and Suppression of Radial Transport by Control of Radial Electric Field

直接测量弹跳离子并通过控制径向电场抑制径向传输

基本信息

批准号：
15360488
负责人：
ISHII Kameo
金额：
$ 4.1万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15360488/
关键词：
Plug Potential Bounce Ion Potential Confinement Tandem Mirror Radial Electrostatic Field Radial Transport Charge Exchange Bounce Ion Analyzer Gold Neutral Beam Probe Coaxially Divided End-Plates ピッチ角指定小型高効率エネルギー分析器金中性粒子ビームポローブ同軸分離型エン

项目摘要

The purpose of this research is to investigate the transport of ions bouncing between the electrostatic plug potentials or magnetic mirrors passing through the anchor cells having a non-axisymmetric magnetic field configuration. Existence of the bounced ion by the plug potential is essential for improvement of the plasma confinement in the tandem mirror. We observed the bounce ions using two kinds of measurement techniques, that is, we measured the bounce ions as the peaking end-loss ions appeared after switching off the microwave injection into the plug region by use of an end-loss energy component analyzer (ELECA), and we measured the bounce ions by use of a charge exchange bounce ion analyzer of a compact type (CXBIA) located near the inner mirror throat of the plug/barrier cell.The transport of the bounce ions to the loss region, which was caused by the Alfven ion-cyclotron (AIC) fluctuation excited in the central solenoid and measured using a gold neutral beam probe (GNBP), was in … More vestigated from a view point of the ion diffusion across the loss boundary in the velocity space by measurement of the velocity distribution function of the end-loss ion. We observed the gentle hump structure on the energy distribution function of the end-loss ion, which was measured by the ELECA device, and estimated the enhancement factor. In order to control the radial potential profile of the core plasma, we changed the electrostatic potentials of the coaxially divided end plates, and observed experimentally the effect of the control of the potential profile. The trajectories of the bounced ions by the plug potential were calculated as a function of the width of the radial potential profile on the assumption that the shape of the magnetic flux tube was slightly different from the shape of the equi-potential surface at the mirror throats of the anchor cell. The discrepancy enhanced the radial transport for the bounce ions to flow from the bounce region to the loss region.We confirmed experimentally and theoretically that the spread type of radial potential profile of the core plasma was effective for the increase of the density of the plasma and also the bounce ions. It is important that the microwave injection for the creation of the plug potential should be considered from this point of view. Less

本研究的目的是探讨离子在静电塞电位或磁镜之间跳跃通过具有非轴对称磁场配置的锚细胞的输运。在串联反射镜中，由于塞势的作用而被反弹的离子的存在是改善等离子体约束的关键。我们使用两种测量技术观察到了反弹离子，即，我们使用端损能量成分分析仪（ELECA）在切断微波注入到插塞区域后，在出现峰值端损离子时测量反弹离子，我们用一台紧凑型电荷交换弹跳离子分析器（CXBIA）测量了弹跳离子，该分析器位于塞子的内镜喉附近。用金中性束探针（GNBP）测量了由中心螺线管中激发的Alfven离子回旋（AIC）涨落引起的反弹离子向损耗区的输运，并与实验结果进行了比较。 ...更多信息通过测量端部损失离子的速度分布函数，从离子扩散穿过速度空间中的损失边界的观点来研究。利用ELECA装置测量了端损离子的能量分布函数，观察到了平缓的驼峰结构，并估算了增强因子。为了控制等离子体的径向电势分布，我们改变了同轴分开的端板的静电势，并在实验上观察了电势分布的控制效果。假设磁通量管的形状与锚室的镜像喉部的等势面的形状略有不同，则作为径向势分布的宽度的函数来计算由塞势反弹的离子的轨迹。这种差异增强了反弹离子从反弹区向损失区的径向输运，实验和理论证实了扩散型径向势分布对等离子体密度的增加和反弹离子的密度增加是有效的。重要的是，从这个角度来看，微波注入的火花塞电位的创建应考虑。少