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<p>Electron cyclotron resonance (ECR) ion sources (ECRISs) are applied in various fields such as cancer therapy and accelerator physics. We have studied how to increase the yield of multicharged ions in the beam of a 2.45-GHz ECRIS. Mixing low-<i>Z</i> gas into the plasma is empirically known as one of the methods to improve the efficiency of the production of multicharged ions. There are various explanations for this gas mixing effect. One of them is the ion cooling effect. It is expected that the efficiency could be enhanced further by using radiofrequency (RF) electromagnetic waves of a lower frequency than is applied for ECR. The purpose of this study is to confirm the increased yield of multicharged ions due to the gas mixing effect in an ECRIS and to measure the plasma parameters and ion beam emittance for the plasma with low-<i>Z</i> gas mixing and with lower-frequency RF waves.</p> Graphical abstract <p></p>

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Effect of low-Z gas mixing for producing multicharged ions in an electron cyclotron resonance ion source

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • Yushi Fujimura,
  • Akinobu Ide,
  • Toyohisa Asaji,
  • Masayuki Muramatsu,
  • Atsushi Kitagawa,
  • Yushi Kato

摘要

Electron cyclotron resonance (ECR) ion sources (ECRISs) are applied in various fields such as cancer therapy and accelerator physics. We have studied how to increase the yield of multicharged ions in the beam of a 2.45-GHz ECRIS. Mixing low-Z gas into the plasma is empirically known as one of the methods to improve the efficiency of the production of multicharged ions. There are various explanations for this gas mixing effect. One of them is the ion cooling effect. It is expected that the efficiency could be enhanced further by using radiofrequency (RF) electromagnetic waves of a lower frequency than is applied for ECR. The purpose of this study is to confirm the increased yield of multicharged ions due to the gas mixing effect in an ECRIS and to measure the plasma parameters and ion beam emittance for the plasma with low-Z gas mixing and with lower-frequency RF waves.

Graphical abstract