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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Stability study of all-permanent-magnet electron cyclotron resonance ion source
1Takasaki Advanced Radiation Research Institute, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan. yoshida.kennichi71@jaea.go.jp
The Review of Scientific Instruments
|March 3, 2010
Summary
Electron cyclotron resonance ion source stability was studied. Temperature changes significantly impact beam intensity by affecting vacuum and magnetic fields, despite coolant temperature control.
Area of Science:
- Physics
- Plasma Physics
- Ion Source Technology
Background:
- Electron cyclotron resonance (ECR) ion sources are crucial for generating stable ion beams.
- Developing highly stable ion sources is essential for various scientific applications.
- Permanent magnet ECR ion sources offer advantages in compactness and field configuration.
Purpose of the Study:
- To investigate the causes of beam intensity fluctuation in a permanent magnet ECR ion source.
- To understand the relationship between plasma chamber coolant temperature and beam intensity stability.
- To identify key parameters influencing intensity variations for improved source design.
Main Methods:
- Experimental investigation of an all-permanent-magnet ECR ion source.
- Precise control of plasma chamber coolant temperature within +/-0.1 degrees C.
- Measurement and estimation of temperature effects on chamber expansion, magnetic field strength, and vacuum.
- Correlation analysis between environmental parameters and beam intensity.
Main Results:
- Achieved beam intensity stability better than 3.2% under controlled conditions.
- Observed strong intensity variations with intentional changes in coolant temperature.
- Demonstrated that minor fluctuations in vacuum and magnetic field strength significantly impact beam intensity.
- Quantified the influence of coolant temperature on chamber geometry and magnetic field.
Conclusions:
- Plasma chamber coolant temperature is a critical factor for stable beam intensity in permanent magnet ECR ion sources.
- Vacuum level and magnetic field strength are highly sensitive to temperature changes and directly affect beam intensity.
- Further optimization requires precise control over these environmental parameters to minimize fluctuations.
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