Radiation Physics and Engineering
A peer-reviewed journal published by K. N. Toosi University of Technology

RF transmission line of a 2.45 GHz ECR ion source

Document Type : Research Article

Authors

Marzieh Asadi Aghbolaghi 1
Fereydoun Abbasi Davani 1
Masoomeh Yarmohammadi Satri 2
Zafar Riazi Mobarake 2
Farshad Ghasemi 2

1 Department of Radiation Application, Faculty of Nuclear Engineering, Shahid Beheshti University, P.O. Box 19839-69411, Tehran, Iran

2 School of Physics and Accelerators, Nuclear Science and Technology Research Institute, P.O. Box 14395-836, Tehran, Iran

https://doi.org/10.22034/rpe.2024.471148.1230
Abstract
Microwave coupling plays an important role to energize the electrons in an electron cyclotron resonance ion source (ECRIS) plasma. Several components are hired for wave transition from a magnetron to the ECR plasma chamber. In this work, DC break, pressure window, ridged waveguide and plasma chamber have been designed and simulated by COMSOL Multiphysics to transmit the microwave power. The power and frequency are 1 kW and 2.45 GHz, respectively. The results show the TE111 mode gets excited and 9.9 mm quartz pressure window maximize the forward transmission power to the cavity. The DC break is based on utilizing the insulating rings along the WR-284 waveguide, which has low wave return loss for a wide range of frequencies. A four-ridged waveguide is considered for impedance matching and electric field focusing. The amplification of the electric field in the middle of cylindrical plasma chamber is satisfied with dimensions of Ø9 cm×10 cm.

Highlights

  • The TE111 mode gets excited in the cylindrical cavity with dimensions of ∅9 cm × 10 cm.
  • A four-ridged waveguide is considered for impedance matching and electric field focusing.
  • The 9.9 mm quartz pressure window is designed with the lowest return wave loss (S11) of -51 dB.
  • The DC break is based on utilizing the insulating rings with low wave return loss of -43 dB

Keywords

ECRIS
RF transmission line
DC break
Pressure window
Ridged waveguide
Plasma chamber
 
Asadi Aghbolaghi, M., Abbasi Davani, F., Yarmohammadi Satri, M., et al. (2023). Design and comparing of high voltage break in wave transferring line of an ECR ion source. The 29th Iranian Nuclear Conference.
Chowdhury, P. R. (2014). Design, development and characterization of high current electron cyclotron resonance ion source. Mumbai.
Geller, R. (2018). Electron cyclotron resonance ion sources and ECR plasmas. Routledge.
Jain, S., Sharma, D., Senecha, V., et al. (2014). Study of microwave components for an electron cyclotron resonance source: Simulations and performance. Sadhana, 39:901–920.
Jin, Q. Y., Liu, Y. G., Zhou, Y., et al. (2021). Rf and microwave ion sources study at institute of modern physics. Plasma, 4(2):332–344.
Pozar, D. M. (2021). Microwave engineering: theory and techniques. John wiley & sons.
Radiation Physics and Engineering
Volume 6, Issue 1
Winter 2025
Pages 59-63

  • Receive Date 01 August 2024
  • Revise Date 24 September 2024
  • Accept Date 07 October 2024

Home

Submit Manuscript

Reviewers

Contact Us