Microwave-accessibility conditions estimated by plasma parameters obtained experimentally on electron cyclotron resonance ion source.
Microwave-accessibility conditions estimated by plasma parameters obtained experimentally on electron cyclotron resonance ion source.
复制标题
通过在电子回旋共振离子源上实验获得的等离子体参数估计微波可达性条件。
DOI：
10.1063/5.0035631
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Y. Kato
中科院分区：
文献类型：
--
作者：
W. Kubo;S. Harisaki;I. Owada;Koichi Sato;K. Tsuda;Y. Kato
我们在镜场中心形成的电子回旋共振区的上游和下游区域分别插入两个探针。在相同的工作条件下，我们同时测量了每个区域的等离子体参数。我们在两个位置测量离子饱和电流Iis和电子能量分布函数。我们得到的测量结果表明，更有效的ECR的一侧更接近微波发射比那些在另一侧。这与右旋极化波的可达性条件是一致的。我们还比较了从同轴半偶极子天线和从棒状天线发射微波的情况下提取的Ar离子束的电荷态分布。我们观察到较高的多电荷离子束流在较低的微波功率的情况下的棒状天线比那些在同轴半偶极子天线的情况下。我们也证实了稳定的离子束流的增加在相当高的微波功率的情况下的同轴半偶极子天线。在此基础上，提出了一种新的微波发射方法--“双ECR加热”，并给出了较好的初步实验结果。
We insert two probes in the upstream and the downstream regions with respect to the electron cyclotron resonance (ECR) zone which is formed at the center of mirror fields. We measure simultaneously plasma parameters in those regions by each of them under the same operating condition. We measure ion saturation currents Iis and electron energy distribution functions at two positions. We obtain measurement results that suggest the more efficient ECR on the side closer to the microwave-launchings than those on the other side. It is consistent with the accessibility condition of the right-hand polarization wave. We also compare the charge state distributions of Ar ion beams extracted in the case of launching microwaves from the coaxial semi-dipole antenna and those from the rod antenna. We observe the higher multicharged ion beam currents at the low microwave powers in the case of the rod antenna than those in the case of the coaxial semi-dipole antenna. We also confirm stable increasements of ion beam currents at considerably high microwave powers in the case of the coaxial semi-dipole antenna. Based on the experimental results, we propose a new microwave-launching method, "dual-ECR heating" and report its preferable preliminary experimental results in this paper.