Inductively driven surface-plasma negative ion source for N-NBI use (invited).
Yu Belchenko1, G Abdrashitov1, P Deichuli1
1Budker Institute of Nuclear Physics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia.
The Review of Scientific Instruments
|March 3, 2016
Summary
A new surface-plasma source prototype was developed for negative-ion based neutral beam injectors. This device achieves stable H(-) beam extraction and acceleration, crucial for fusion energy research.
Area of Science:
- Plasma Physics
- Fusion Energy Engineering
- Particle Accelerators
Background:
- Negative-ion based neutral beam injectors are critical for heating and sustaining plasma in fusion devices.
- Developing efficient and stable negative ion sources is a key challenge in fusion energy research.
- Existing sources often face limitations in long-term stability and operational efficiency.
Purpose of the Study:
- To develop and characterize a novel long-pulse surface-plasma source prototype for negative-ion based neutral beam injectors.
- To enhance the stability and performance of negative hydrogen ion (H(-)) beam generation and acceleration.
- To investigate the effectiveness of advanced electrode design and cesium deposition techniques.
Main Methods:
- Utilized a surface-plasma source prototype with active temperature control for ion-optical system electrodes.
- Implemented a concaved transverse magnetic field in extraction and acceleration gaps to prevent electron trapping.
- Employed directed cesium deposition via distribution tubes for enhanced ion production.
- Routinely extracted and accelerated a stable H(-) beam at approximately 1 Ampere and 90 keV.
Main Results:
- Achieved a stable H(-) beam current of approximately 1 Ampere at 90 keV.
- Demonstrated long-term cesium effect from a single deposition, simplifying operational procedures.
- Improved high voltage strength of ion-optical system electrodes through active heating.
- Successfully prevented electron trapping and avalanching using the designed magnetic field configuration.
Conclusions:
- The developed long-pulse surface-plasma source prototype meets the requirements for negative-ion based neutral beam injectors.
- The implemented design features, including active electrode heating and optimized magnetic fields, significantly enhance source performance and stability.
- This advancement contributes to the development of more efficient and reliable neutral beam injection systems for future fusion reactors.
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