Singly charged ion source designed using three-dimensional particle-in-cell method

Area of Science:

• Nuclear Physics
• Plasma Physics
• Medical Physics

Background:

• Isotope Separation On-Line (ISOL) systems are vital for producing radioactive isotopes for medical applications.
• Heavy-ion cancer therapy requires efficient production of specific isotopes, such as 11C.
• Accurate dose verification in cancer therapy can be achieved using Positron Emission Tomography (PET).

Purpose of the Study:

• To design a novel Singly Charged Ion Source (SCIS) for an ISOL system.
• To achieve efficient production of 11C ions for heavy-ion cancer therapy and PET verification.
• To investigate and optimize SCIS design using a newly developed 3D particle-in-cell (PIC) code.

Main Methods:

• Development of a three-dimensional particle-in-cell (PIC) code for simulating ion source physics.
• Utilizing the PIC code to model electron beam trajectories and ion extraction dynamics.
• Comparing simulation results with experimental data to validate the code and design.

Main Results:

• The designed SCIS produces hollow electron beams, leading to a high effective electron current.
• Predicted ion-production efficiencies (IPEs) of approximately 6.7% for 11C from CO2 and 0.1% for C+ from CH4.
• Validation of the PIC code through comparison of simulated and experimental space-charge-limited current and total IPE.

Conclusions:

• The developed PIC code is a valid tool for designing efficient ion sources.
• The designed SCIS meets the efficiency requirements for ISOL systems used in cancer therapy.
• The SCIS design facilitates the production of 11C ions for advanced medical applications.