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Development of continuous wave high voltage negative ion beam injector for tandem accelerator
A Sanin1, Yu Belchenko1, A Ivanov1
1Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
The Review of Scientific Instruments
|January 3, 2020
Summary
A new negative ion injector significantly boosts tandem accelerator current, achieving 14 mA, 133 keV H- ion beam. Secondary electron coacceleration was managed using a magnetic filter.
Area of Science:
- Nuclear Physics
- Particle Accelerators
Background:
- The Budker Institute of Nuclear Physics operates a vacuum-insulated tandem accelerator using a 10 mA, 25 keV negative ion injector.
- Existing systems face limitations in achieving higher accelerated currents.
Purpose of the Study:
- To develop and evaluate a new negative ion injector system to increase the tandem accelerated current.
- To investigate the production, acceleration, and transport of H- ion beams.
Main Methods:
- Designed and implemented a new injector with an upgraded negative ion source and beam preacceleration.
- Utilized a test stand with electrical and optical diagnostics for H- ion beam analysis.
- Conducted numerical modeling of beam transport and compared with experimental data.
Main Results:
- Successfully produced and transported a 14 mA, 133 keV continuous wave negative ion beam.
- Observed and quantified the coacceleration of secondary electrons (up to 2% of the beam current).
- Demonstrated effective removal of coaccelerated electrons using a magnetic filter.
Conclusions:
- The new injector design enhances the capability of the tandem accelerator for higher beam currents.
- Secondary electron management is crucial for efficient negative ion beam transport.
- Numerical modeling provides a reliable tool for predicting beam behavior.
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