论文标题
10 GHz最小b四极杆永久磁铁电子回旋离子源的设计
Design of a 10 GHz minimum-B quadrupole permanent magnet electron cyclotron resonance ion source
论文作者
论文摘要
本文介绍了具有最小B四极磁场拓扑的永久磁铁环状共振离子源（ECRIS）的模拟研究。磁场的制造是用$ b_ \ textrm {min}/b_ \ textrm {ecr} $ 0.67的常规ECRIS和10 GHz的最后一个封闭的磁性等音表（ecr} $ 0.67，最后一个封闭的磁性等音表面为10 ghz。平行于该场的磁场梯度的分布，影响电子加热效率，覆盖0至13 t/m的范围，类似于常规的ECRIS。因此，预计新型离子源会产生温暖的电子和高电荷态离子。单个电子跟踪模拟用于估计等离子体腔室壁上的等离子体通量分布，并在离子光学模拟中使用的提取缝隙处的离子密度谱估计，以表明通过低能能光束传输表现出很高的传输。设计的离子源旨在研究四极场拓扑是否可以在与常规ECRIS相似的强度中产生高电荷状态束并通过低能梁线有效地运输它们，从而为超导ARC-ECRIS铺平了道路。此外，讨论了所提出的离子源设计的前景作为离子束分析的单端加速器的注射器。
This paper presents a simulation study of a permanent magnet electron cyclotron resonance ion source (ECRIS) with a minimum-B quadrupole magnetic field topology. The magnetic field is made to conform to conventional ECRIS with $B_\textrm{min}/B_\textrm{ECR}$ of 0.67 and a last closed magnetic isosurface of 1.86$B_\textrm{ECR}$ at 10 GHz. The distribution of magnetic field gradients parallel to the field, affecting the electron heating efficiency, cover a range from 0 to 13 T/m, being similar to conventional ECRIS. Therefore it is expected that the novel ion source produces warm electrons and high charge state ions in significant number. Single electron tracking simulations are used to estimate plasma flux distribution on the plasma chamber walls and to provide an estimate of the ion density profile at the extraction slit then used in ion optical simulations demonstrating high transmission through the low energy beam transport. The designed ion source is intended to study if the quadrupole field topology could produce high charge state beams in comparable intensities to conventional ECRIS and efficiently transport them through a low energy beamline, thus paving the way for a superconducting ARC-ECRIS using the same field topology. Furthermore, the prospects of the presented ion source design as an injector of a single-ended accelerator for ion beam analysis are discussed.
