Experiments with biased side electrodes in electron cyclotron resonance ion sources
Experiments with biased side electrodes in electron cyclotron resonance ion sources
复制标题
电子回旋共振离子源中偏压侧电极的实验
DOI：
10.1063/1.4827309
复制
发表时间：
2014
影响因子：
1.6
通讯作者：
S. Biri
中科院分区：
文献类型：
--
作者：
A. G. Drentje;A. Kitagawa;T. Uchida;R. Racz;S. Biri
电子回旋共振离子源（ECRIS）的高电荷离子输出由高度受限等离子体的离子损失组成。因此，增加感兴趣的离子的输出总是在限制的增加和损失的增加之间的折衷。解决方案的一个途径是，从不产生所需输出的方向（即径向方向）消除损耗。这在一个实验中得到了证明（使用日本NIRS的Kei ECRIS），通过正偏置一组六个“侧”电极，在等离子体室的圆柱形壁上沿侧向方向连接（绝缘），以静电方式减少了径向损耗。最近在两个实验室使用两种本质上不同的离子源进行了新的研究。在BioNano ECRIS（日本东洋大学）中，使用了各种电极；每个电极都可以单独偏置。在Atomki ECRIS（匈牙利），一个可移动的，离轴侧电极在技术上应用于两个版本。测量结果表明，与偏置圆盘相比，离子损失确实有所减少，但效率有所不同。
The output of highly charged ions from an electron cyclotron resonance ion source (ECRIS) consists of ionic losses from a highly confined plasma. Therefore, an increase of the output of the ions of interest always is a compromise between an increase in the confinement and an increase of the losses. One route towards a solution consists of attacking the losses in directions – i.e., radial directions – that do not contribute to the required output. This was demonstrated in an experiment (using the Kei ECRIS at NIRS, Japan) where radial losses were electrostatically reduced by positively biasing one set of six “side” electrodes surrounding the plasma in side-ward directions attached (insulated) to the cylindrical wall of the plasma chamber. Recently new studies were performed in two laboratories using two essentially different ion sources. At the BioNano ECRIS (Toyo University, Japan) various sets of electrodes were used; each of the electrodes could be biased individually. At the Atomki ECRIS (Hungary), one movable, off-axis side electrode was applied in technically two versions. The measurements show indeed a decrease of ionic losses but different effectivities as compared to the biased disk.