Effect of Gas Pressure on Plasma Characteristics of a 2.45 GHz ECR Iion Source

Authors

• Marzieh Asadi Aghbolaghi ¹
• Fereydoun Abbasi Davani * ¹
• Masoomeh Yarmohammadi Satri ²
• Zafar Riazi Mobaraki ²
• Farshad Ghasemi ²

1. Department of Radiation Application, Faculty of Nuclear Engineering, Shahid Beheshti University, Tehran, Iran
2. Physic and Accelerators Research School, Nuclear Science and Technology Research Institute, Tehran, Iran

Abstract

Electron cyclotron resonance ion source (ECRIS) is designed and simulated using COMSOL software. The 2.45 GHz microwave is injected through a coaxial cable into a cylindrical chamber with a diameter of 9 cm and a length of 10 cm. Two coils are employed to produce a flat-B magnetic field profile and two resonance zones on both sides of the chamber. Hydrogen gas plasma is simulated by considering H₂, H₂⁺ and H₃⁺ ions, and H and H₂ as neutrals. Finally, electron density and temperature are reported as a function of gas pressure. It is observed that as the gas pressure increases, the electron temperature decreases and the electron density decline following an initial increases.

Keywords

• Gas pressure
• Electron density
• Electron temperature
• ECRIS
• Plasma