Effects of magnetic configuration on hot electrons in a minimum-B ECR plasma
Effects of magnetic configuration on hot electrons in a minimum-B ECR plasma
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磁构型对最小 B ECR 等离子体中热电子的影响
DOI：
10.1088/1361-6587/ab9d8f
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发表时间：
2020-08
影响因子：
2.2
通讯作者：
H W Zhao
中科院分区：
文献类型：
--
作者：
J B Li;L X Li;B S Bhaskar;V Toivanen;O Tarvainen;D Hitz;L B Li;W Lu;H Koivisto;T Thuillier;J W Guo;X Z Zhang;H Y Zhao;L T Sun;H W Zhao
为了研究高电荷态电子回旋共振离子源（ECRIS）中的热电子布居和动力学不稳定性，在SECRAL-Ⅱ（Superconducting ECR ion source with Advanced design in Lanzhou No. II）离子源上同步测量了不同磁场配置下ECRIS等离子体的轴向韧致辐射谱和微波爆发.实验结果表明，当最小场与共振场之比（Bmin/Becr）小于0.8时，在注入场、引出场和径向镜场保持不变的情况下，韧致辐射谱温Ts随Bmin/Becr之比线性增加。超过这个阈值Ts饱和，同时出现电子回旋不稳定性。研究还表明，在轴向梯度和六极场强一定的情况下，Ts随ECR表面平均梯度的增大而线性减小。此外，当Bmin一定时，在较低镜比下，Ts随谐振区梯度（轴上的λ Becr和<λ Becr>）的增大而减小，在较高镜比下，Ts对梯度不敏感。与最近对全超导ECRIS进行的研究相比（Benitez et al 2017 IEEE Trans. Plasma Sci. 45 1746-54），其中得出结论，Ts仅对Bmin敏感，本文显示了不同的结果，讨论了磁场参数与Ts相关性背后的机制。
To investigate the hot electron population and the appearance of kinetic instabilities in highly charged electron cyclotron resonance ion source (ECRIS), the axially emitted bremsstrahlung spectra and microwave bursts emitted from ECRIS plasma were synchronously measured on SECRAL-II (Superconducting ECR ion source with Advanced design in Lanzhou No. II) ion source with various magnetic field configurations. The experimental results show that when the ratio of the minimum field to the resonance field (i.e. Bmin/Becr) is less than ∼0.8, the bremsstrahlung spectral temperature Ts increases linearly with the Bmin/Becr–ratio when the injection, extraction and radial mirror fields are kept constant. Above this threshold Ts saturates and the electron cyclotron instability appears simultaneously. This study has also demonstrated that Ts decreases linearly with the increase of the average gradient over the ECR surface when the on-axis gradient and hexapole field strengths are constant. In addition, it is found that Ts decreases with the increase of the gradient at the resonance zone (∇Becr on axis and <∇Becr>) at relatively low mirror ratio and is insensitive to the gradient at high mirror ratio when Bmin is constant. Compared to a recent study taken on a fully superconducting ECRIS (Benitez et al 2017 IEEE Trans. Plasma Sci. 45 1746–54), in which it was concluded that Ts is only sensitive with Bmin, this article shows different results discussing the mechanisms behind the correlation of magnetic field parameters to Ts.
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DOI：
10.1063/1.2821137
发表时间：
2008-02
期刊：
The Review of scientific instruments
影响因子：
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发表时间：
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期刊：
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影响因子：
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