Department of Electrical Engineering, Tohoku University, Sendai 980-8579, Japan.
Phys Rev Lett. 2016 Apr 1;116(13):135001. doi: 10.1103/PhysRevLett.116.135001. Epub 2016 Mar 30.
An electron energy probability function and a rf magnetic field are measured in a rf hydrogen helicon source, where axial and transverse static magnetic fields are applied to the source by solenoids and to the diffusion chamber by filter magnets, respectively. It is demonstrated that the helicon wave is reflected by the rapidly bent magnetic field and the resultant standing wave heats the electrons between the source and the magnetic filter, while the electron cooling effect by the magnetic filter is maintained. It is interpreted that the standing wave is generated by the presence of a spatially localized change of a refractive index.
在射频氢螺旋波源中测量了电子能量概率函数和射频磁场，其中螺线管向源施加轴向和横向静磁场，而滤波器磁铁向扩散室施加磁场。结果表明，螺旋波被快速弯曲的磁场反射，由此产生的驻波加热源和磁过滤器之间的电子，同时保持磁过滤器对电子的冷却效果。可以解释为，驻波是由折射率的空间局部变化引起的。
