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Development of a high current H(-) ion source for cyclotrons
H Etoh1, Y Aoki1, H Mitsubori1
1Technology Research Center, Sumitomo Heavy Industries, Ltd., Yokosuka, Japan.
The Review of Scientific Instruments
|March 6, 2014
Summary
A new multi-cusp DC H(-) ion source for medical cyclotrons achieved 16 mA of negative ion beam current. This was accomplished using cesium seeding and optimizing the source design for efficient operation.
Area of Science:
- Nuclear Physics
- Plasma Physics
- Medical Physics
Background:
- Cyclotrons are essential for medical isotope production and particle therapy.
- High-intensity negative hydrogen ion (H(-)) beams are crucial for efficient cyclotron operation.
- Existing ion sources require optimization for enhanced beam current and stability.
Purpose of the Study:
- To design and fabricate a multi-cusp DC H(-) ion source for medical cyclotron applications.
- To optimize key operational parameters for improved negative ion beam current.
- To evaluate the effect of cesium seeding on ion source performance.
Main Methods:
- Designed and fabricated a multi-cusp DC H(-) ion source.
- Optimized filament configuration, magnetic filter strength, and extraction electrode geometry.
- Introduced a small quantity of cesium (Cs) into the ion source.
Main Results:
- Achieved a stable DC H(-) ion beam current of 16 mA.
- Demonstrated enhanced beam current with cesium-seeded operation.
- Operated the ion source at a low arc discharge power of 2.8 kW.
Conclusions:
- The developed multi-cusp DC H(-) ion source is suitable for medical cyclotron applications.
- Cesium seeding significantly enhances negative ion beam current.
- The optimized source design offers efficient performance at low power consumption.
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