Numerical simulation of ion charge breeding in electron beam ion source

Area of Science:

• Atomic Physics
• Plasma Physics
• Accelerator Physics

Background:

• Particle-in-cell (PIC) codes are essential for simulating complex plasma phenomena.
• Electron Beam Ion Sources (EBIS) are crucial for producing highly charged ions for various applications.
• Accurate modeling of atomic processes and beam dynamics is vital for EBIS performance optimization.

Purpose of the Study:

• To report recent advancements in the Electron Beam Ion Source particle-in-cell (EBIS-PIC) code.
• To enhance the accuracy of ionization modeling and extend simulations to beamline transport.
• To validate the improved EBIS-PIC code against experimental data from a cesium charge-breeding experiment.

Main Methods:

• Implemented experimental ionization energies and shell effects in the ionization module.
• Extended the EBIS-PIC code to include beamline transport calculations for ion acceptance and emittance.
• Performed Monte Carlo simulations for atomic processes and self-consistent electric potential updates.
• Conducted a simulation of a cesium charge-breeding experiment at Brookhaven National Laboratory (BNL).

Main Results:

• The improved ionization module enhances simulation accuracy.
• Calculations of injected ion acceptance and extracted ion beam emittance are now possible.
• EBIS-PIC simulation results for the Cs charge-breeding experiment show strong agreement with experimental charge state distributions.
• Detailed radial profiles and velocity space distributions of trapped ions are presented.

Conclusions:

• The enhanced EBIS-PIC code provides a more accurate and comprehensive tool for simulating EBIS performance.
• The code's ability to model beamline transport opens new avenues for optimizing ion injection and extraction.
• Validation against experimental data confirms the reliability of the improved code for predicting ion behavior in EBIS devices.