Development of low-energy and high-current-density ion beam system

Area of Science:

• Physics
• Materials Science
• Engineering

Background:

• Development of low-energy ion beam systems is crucial for various applications.
• Multicusp magnetic field ion sources offer potential for high-current-density beams.
• Optimizing electrode geometry is key to controlling ion beam properties.

Purpose of the Study:

• To develop a low-energy ion beam system (<300 V) using a multicusp magnetic field ion source.
• To investigate and compare the beam extraction characteristics of flat and concave electrodes.
• To achieve high current density ion beam extraction.

Main Methods:

• Construction of a low-energy ion beam system utilizing a multicusp magnetic field ion source.
• Operation at a direct current (dc) voltage below 300 V.
• Experimental comparison of beam extraction using flat and concave electrodes, including a concave electrode with a 350 mm focal length.

Main Results:

• Successful extraction of a high-current-density ion beam (6.9 mA/cm²).
• Demonstrated superior beam profile sharpness with a concave electrode compared to a flat electrode.
• Quantified beam extraction characteristics for different electrode geometries.

Conclusions:

• The developed low-energy ion beam system is effective for high current density applications.
• Concave electrode design significantly enhances ion beam focusing and profile sharpness.
• This technology holds promise for applications requiring precise low-energy ion beam delivery.