Possibility of generating H+, or H2+, or H3+ dominated ion beams with a 2.45 GHz permanent magnet ECR ion source,Review of Scientific Instruments

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Possibility of generating H+, or H2+, or H3+ dominated ion beams with a 2.45 GHz permanent magnet ECR ion source
Review of Scientific Instruments ( IF 1.3 ) Pub Date : 2019-12-01 , DOI: 10.1063/1.5128019
Shixiang Peng ₁ , Wenbin Wu ₁ , Haitao Ren ₁ , Jingfeng Zhang ₁ , Yuan Xu ₁ , Ailin Zhang ₁ , Tao Zhang ₁ , Tenghao Ma ₁ , Yaoxiang Jiang ₁ , Jiang Sun ₁ , Jiamei Wen ₁ , Zhiyu Guo ₁ , Jiaer Chen ₁

Affiliation

At Peking University (PKU), experimental research as well as theoretical study on how to produce high intense H+, H2 +, or H3 + 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.

更新日期：2019-12-01

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