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Updated: Jul 7, 2026
10:42
Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
KEKCB electron cyclotron resonance charge breeder at TRIAC
1High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, Japan. nobuaki.imai@kek.jp
The Review of Scientific Instruments
|March 5, 2008
Summary
The KEKCB electron cyclotron resonance (ECR) ion source efficiently converts singly charged ions to multicharged ions. Its performance is unaffected by radioactive nuclei lifetimes, and impurities are reduced through surface treatment.
Area of Science:
- Nuclear Physics
- Plasma Physics
- Accelerator Technology
Background:
- Electron Cyclotron Resonance (ECR) ion sources are crucial for producing multicharged ions.
- The Tokai Radioactive Ion Accelerator Complex requires efficient ion conversion for its experiments.
Purpose of the Study:
- To evaluate the performance of the KEKCB ECR ion source for converting singly charged ions to multicharged ions.
- To assess the impact of radioactive nuclei lifetimes on conversion efficiency.
- To identify methods for reducing impurities in the ECR plasma.
Main Methods:
- Utilized the KEKCB ECR ion source to process gaseous and nongaseous ions.
- Measured the conversion efficiency for ions with A/q approximately 7.
- Investigated the influence of radioactive nuclei with lifetimes of about one second.
- Employed collimators for beam axis definition and injection.
- Implemented grinding and washing techniques for electrode and plasma chamber surfaces.
Main Results:
- Achieved conversion efficiencies of 7% for gaseous ions and 2% for nongaseous ions.
- Demonstrated that conversion efficiency is independent of radioactive nuclei lifetimes.
- Successfully reduced impurities originating from the ECR plasma through surface treatments.
Conclusions:
- The KEKCB ECR ion source is effective for multicharged ion production.
- The ion conversion process is robust against variations in radioactive nuclei lifetimes.
- Surface preparation methods significantly mitigate plasma impurities, enhancing ion beam quality.
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