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论文成果
Possibility of generating H+/H2+/H3+domain beams with a 2.45 GHz PMECR Ion Source(Invited)
发布时间：2020-08-21点击次数：
影响因子：
1.48
DOI码：
10.1063/1.5128019
发表刊物：
Rev. Sci. Instrum.
关键字：
generating H+, or H2+, or H3+ dominated ion beams, 2.45GHz ECR Ion Source, numerical model, three-phase diagram, miniaturized ECR ion source.
摘要：
At Peking University (PKU), experimental research as well as theoretical study on how to produce high intenseH+,H2+, orH3
+ dominated ion beams with a compact permanent magnet 2.45 GHz electron cyclotron resonance (PMECR) ion source have been continuously carried out in the past few decades. Based on the comprehension of hydrogen plasma processes inside a 2.45 GHz PMECR discharge chamber, a three-phase diagram of ion fraction dominant regions that illustrates the relationship between the H+, H2+, and H3+ ion species and working parameters
was presented. Meanwhile, a numerical model based on the particle population balance equations was developed for quantitative comprehension of electron cyclotron heated hydrogen plasma. Calculated results of H+, H2+, and H3
+ fractions against gas pressure, microwave density,
and wall material obtained with this numerical model agree well with the measured ones. Recently, a miniaturized ECR ion source has been developed, and a 52 mA hydrogen beam was extracted. Under the guidance of the model, H+, H2+, and H3+ beams with a fraction of 88%, 80%, and 82%, respectively, were obtained with this miniaturized ECR ion source under suitable working parameters. A PMECR ion source for a proton therapy facility has been built at PKU recently. A 34 mA beam H+ fraction of 91% was obtained at the first attempt.
论文类型：
期刊论文
学科门类：
理学
一级学科：
物理学
文献类型：
J
卷号：
90
页面范围：
123305-1-123305-7
是否译文：
是
发表时间：
2019-11-20
收录刊物：
SCI、EI
附件：