Experiments with biased side electrodes in electron cyclotron resonance ion sources

Area of Science:

• Plasma physics
• Ion source technology
• Atomic and molecular physics

Background:

• Electron Cyclotron Resonance Ion Sources (ECRIS) produce highly charged ions but suffer from plasma confinement and ion losses.
• Optimizing ECRIS performance requires balancing increased plasma confinement with reduced ion losses.
• Attacking radial ion losses offers a promising route to enhance ion output without compromising confinement.

Purpose of the Study:

• To investigate methods for reducing radial ion losses in ECRIS.
• To evaluate the effectiveness of biased side electrodes in minimizing ion losses.
• To compare the efficiency of different electrode configurations in improving ion output.

Main Methods:

• Experiments were conducted using the Kei ECRIS, BioNano ECRIS, and Atomki ECRIS.
• Radial ion losses were electrostatically reduced by positively biasing sets of side electrodes surrounding the plasma.
• Individual biasing of electrodes and the use of movable, off-axis electrodes were explored.

Main Results:

• Biasing side electrodes successfully reduced radial ionic losses in ECRIS.
• Different electrode configurations and biasing strategies showed varying degrees of effectiveness.
• The results demonstrated a decrease in ionic losses compared to previous methods.

Conclusions:

• Electrostatic reduction of radial losses using biased side electrodes is an effective strategy for enhancing ECRIS performance.
• Optimizing electrode design and biasing is crucial for maximizing ion output.
• This approach offers a viable method to improve the efficiency of highly charged ion production.