Optimization of Helical Plasma Confinement

螺旋等离子体约束的优化

基本信息

批准号：
07044108
负责人：
MATSUOKA Keisuke
金额：
$ 1.66万
依托单位：
National Institute for Fusion Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07044108/
关键词：
helical plasma Pfirsch-Schluter current dipole field quadrupole field high beta heavy ion beam probe 2-D stellarator ICRF heating

项目摘要

Suppression of Pfirsch-Schluter (P-S) current has been investigated in a conventional helical system as one of helical-plasma-optimization procedures.P-S current causes a deformation of magnetic surfaces which results in the deterioration of the energy confinement.Strong inward shift of magnetic axis shift by a vertical field is effective to suppress the P-S current for an 1=2 stellarator with no shear and for an 1=3 heliotron/torsatron with no rotational transform at axis.For an 1=2 heliotron/torsatron with shear and central rotational transform, it is necessary to elongate the magnetic surface vertically by controlling the quadrupole field in addition to the inward shift by controlling the dipole field.New scenario of stellarator optimization, which was based on the 2-dimensional helical system, was shown.This is more general than the W7-X strategy, but is limited near the magnetic axis.In the 2-D configuration, the particle confinement is dramatically improved compared with a conven … More tional helical system which is of 3-D geometry.This idea helps to promote the quasi-toroidal symmetric stellarator which is now being considered as a new optimized helical system.Heavy ion beam probe is successfully operated in CHS,for the first time in helical machines, to measure the electrostatic potential of the plasma.Here, heavy ion beam trajectory is controlled by octopole deflectors both at the inlet and outlet of the beam.The control method of beam trajectory was compared with that of the russian type and there were some comments from russian side to improve our system.Some of them are for reducing UV light effect which causes emission of secondary electrons resulting in the operation limit on the electron density.Electron heating of ICRF in CHS was compared with L-2 results.In CHS reflection at the high field side R cut-off is newly introduced.ICRF wave physics in real machines is in progress to explain experimental results.Future collaboration on stellarator optimization, transport code in the optimized configuration, diamagnetic measurement, electron distribution function in ECH plasma, modular coil design, has been discussed. Less

已在常规螺旋系统中研究了抑制PFIRSCH-SCHLUTER（P-S）电流，这是螺旋 - 质量超临能的一种过程之一。P-S电流导致磁表面的变形，导致能量限制的定义。对于垂直场的磁轴向外移动而言，磁轴向外移动均可抑制垂直轴的3 = P-S = p-S = p-s she and 1 = 2 2 2 = 2 2 stellar and 1 = 2 stellar and 1 = 2 stellar and 1 = 2 Stellar and 1 = 2 2 = 2 2 = 2 2 Heliotron/torsatron在轴时无旋转变换。对于1 = 2个具有剪切和中央旋转变换的Heliotron/Torsatron，除了控制双极球场外，还必须通过控制二极管范围的速度效果。 W7-X策略，但在磁轴附近受到限制。在2-D配置中，与一个召集的……更具影响力的螺旋系统相比，粒子的约束得到了显着改善，该系统具有3D几何形状。此想法有助于促进准螺旋形的符号对称性恒星剂，现在将其视为新的优化螺旋系统。测量血浆的静电潜力。在此处，重离子束轨迹受到光束入口和出口处的章鱼示威者的控制，将光束轨迹的控制方法与俄罗斯类型的控制方法进行了比较，并且在俄罗斯方面有一些评论，以改善我们的系统。它是为了减少二级电子效应的效率。将CHS与L-2结果进行了比较。在CHS反射高地侧r临界值是新引入的。实际机器中的ICRF Wave Physis正在进行中解释实验结果。FUTURE合作恒星优化，在优化的配置，DIAMARAGNETIC MAIMUREMENT，DIAMARANTIC MAIMERICT，DIAMARNETIC MAIMURENT，ECHERON分布功能，ech plasma coil coil coil coil Design，Modular coil Design中，已讨论。较少的