Wave propagation and noncollisional heating in neutral loop and helicon discharges
Wave propagation and noncollisional heating in neutral loop and helicon discharges
复制标题
中性环路和螺旋放电中的波传播和非碰撞加热
DOI：
10.1063/1.3551758
复制
发表时间：
2011
影响因子：
2.2
通讯作者：
H. Sugai
中科院分区：
文献类型：
--
作者：
Y. Celik;D. Crintea;D. Luggenhölscher;U. Czarnetzki;T. Ishijima;H. Sugai
本文研究了两种磁化低压射频（13.56 MHz）放电的加热机制：螺旋放电和中性环放电。径向B点探针测量表明，中性环放电是持续的螺旋波以及。轴向B点探针测量揭示驻波和拍模式取决于直流磁场强度和等离子体密度。在显示出强波阻尼的模式中，等离子体折射率达到100左右的值，导致电子波相互作用。在强阻尼模式下，径向等离子体密度分布主要由传播螺旋波的功率吸收决定，而在弱阻尼模式下，电感耦合占主导地位。此外，方位角抗磁漂移被确定。螺旋波相位的测量表明，由于密度分布的不均匀，初始平面波的波前在其轴向传播过程中是弯曲的。一个发达的解析驻波模型，包括朗道阻尼再现很好的轴向螺旋波场的阻尼。这种比较强调的理论，其中朗道阻尼的电子行进沿着场线的速度接近螺旋相速度是主要的阻尼机制，在两个放电。
Heating mechanisms in two types of magnetized low pressure rf (13.56 MHz) discharges are investigated: a helicon discharge and a neutral loop discharge. Radial B-dot probe measurements demonstrate that the neutral loop discharge is sustained by helicon waves as well. Axial B-dot probe measurements reveal standing wave and beat patterns depending on the dc magnetic field strength and plasma density. In modes showing a strong wave damping, the plasma refractive index attains values around 100, leading to electron-wave interactions. In strongly damped modes, the radial plasma density profiles are mainly determined by power absorption of the propagating helicon wave, whereas in weakly damped modes, inductive coupling dominates. Furthermore, an azimuthal diamagnetic drift is identified. Measurements of the helicon wave phase demonstrate that initial plane wave fronts are bent during their axial propagation due to the inhomogeneous density profile. A developed analytical standing wave model including Landau damping reproduces very well the damping of the axial helicon wave field. This comparison underlines the theory whereupon Landau damping of electrons traveling along the field lines at speeds close to the helicon phase velocity is the main damping mechanism in both discharges.
影响因子：
3.8
作者：
S. Shinohara;T. Motomura;K. Tanaka;T. Tanikawa;K. P. Shamrai
通讯作者：
S. Shinohara;T. Motomura;K. Tanaka;T. Tanikawa;K. P. Shamrai
通过螺旋天线生产大容量 Helicon 等离子体
DOI：
--
发表时间：
2003
期刊：
Proc.of XXVI International Conference on Phenomenon in Ionized Gases 1
影响因子：
--
作者：
Shunjiro Shinohara;et al.
通讯作者：
et al.