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Neutral beam injection with an improved accelerator for LHD.

K Tsumori¹, M Osakabe, O Kaneko

¹National Institute for Fusion Science, Gifu, Japan. tsumori@nifs.ac.jp

The Review of Scientific Instruments

|March 5, 2008

Summary

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An improved accelerator design enhances beam optics and performance. The new multislot grounded grid and racetrack-shaped steering grid significantly boost port-through rates and maximum injection power.

Area of Science:

Physics
Accelerator Science
Plasma Physics

Background:

Improving beam optics is crucial for accelerator efficiency.
Existing accelerator designs face limitations in port-through rates and injection power.

Purpose of the Study:

To describe beam profiles, port-through rates, and injection powers using an improved accelerator.
To enhance beam optics through a novel combination of steering and grounded grids.

Main Methods:

Utilizing a steering grid with a racetrack-shaped aperture.
Implementing a multislot grounded grid for improved beam optics.
Analyzing beam profiles and performance metrics at optimal voltage ratios.

Main Results:

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Optimal beam optics achieved at a voltage ratio of 16.5-16.8.

Beam profiles accurately modeled by superposing multibeamlets with specific divergence angles.

Port-through rate increased from 34% to 38% with the racetrack-shaped steering grid.

Maximum injection power reached 6 MW at 187 keV.

Conclusions:

The improved accelerator design with a multislot grounded grid and racetrack-shaped steering grid enhances beam optics.
The modifications lead to significant improvements in port-through rate and maximum injection power.
The study provides a foundation for further optimization of high-power accelerators.