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A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
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Development of a helicon ion source: Simulations and preliminary experiments.

M Afsharmanesh1, M Habibi1

  • 1Department of Energy Engineering and Physics, Amirkabir University of Technology, Tehran, Iran.

The Review of Scientific Instruments
|April 2, 2018
PubMed
Summary

A helicon ion source was simulated and built, extracting over 200 μA of argon current. The study optimized antenna placement and extraction parameters for improved ion beam characteristics.

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Area of Science:

  • Plasma Physics
  • Ion Source Technology
  • Beam Optics

Background:

  • Helicon ion sources are crucial for various applications requiring high-intensity ion beams.
  • Optimizing extraction systems is key to achieving desired beam quality and current.
  • Understanding plasma mode transitions is essential for efficient source operation.

Purpose of the Study:

  • To simulate and construct a helicon ion source extraction system.
  • To characterize the extracted ion beam and investigate mode transitions.
  • To optimize the extraction system using simulation and experimental validation.

Main Methods:

  • Simulations of the plasma and extraction system using HELIC and IBSimu codes.
  • Experimental commissioning of the ion source up to 20 kV.
  • Characterization using Faraday cup and beam profile monitoring.
  • Analysis of emission line intensity for mode transition detection.

Main Results:

  • Extraction of over 200 μA argon current at up to 20 kV.
  • Observation of a central core in ion beam current distribution.
  • Identification of a jump transition in ion beam current near 700 W RF power, indicating helicon mode excitation.
  • Demonstration of mode transition from inductively coupled plasma to helicon using Ar ii emission line intensity.
  • Optimized antenna placement near the plasma electrode found to be desirable.
  • Determination of optimal mesh size and iteration number for IBSimu simulations.

Conclusions:

  • The developed helicon ion source and extraction system are capable of producing significant ion currents.
  • Antenna positioning and extraction parameters critically influence ion beam properties.
  • The study successfully demonstrated the use of HELIC and IBSimu codes for helicon ion source design and optimization.
  • Further optimization of the extraction system parameters (gap distance, aperture, voltage) is validated through simulation.