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Carbon multicharged ion generation from laser-spark ion source.

Md Mahmudur Rahman1, Oguzhan Balki1, Hani E Elsayed-Ali1

  • 1Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, Virginia 23529, USA.

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This study demonstrates a laser-assisted spark-discharge ion source for generating multicharged carbon ions. The combined technique enhances ion charge states up to C6+ and increases ion yield significantly compared to DC voltage methods.

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Area of Science:

  • Plasma Physics
  • Ion Source Technology
  • Materials Science

Background:

  • Generating multicharged ions is crucial for various applications, including materials processing and fundamental research.
  • Traditional methods often face limitations in achieving high charge states or ion yields.
  • Laser ablation and spark discharge are known plasma generation techniques.

Purpose of the Study:

  • To develop and investigate a novel laser-assisted spark-discharge ion source for efficient generation of multicharged carbon ions.
  • To compare the performance of this hybrid ion source with conventional DC voltage methods.
  • To optimize parameters for maximizing ion charge state and yield.

Main Methods:

  • Utilizing a Q-switched Nd:YAG laser for glassy carbon target ablation.
  • Initiating a spark discharge along the plasma plume's propagation direction.
  • Employing time-of-flight (TOF) and retarding field analyzers for ion detection and energy-to-charge ratio analysis.
  • Controlling laser-spark timing with a delay generator.

Main Results:

  • The laser-assisted spark-discharge method successfully generated carbon ions up to the C6+ charge state.
  • Coupling spark discharge (1.2 J) to the laser-induced plasma significantly increased plasma density and temperature.
  • The hybrid source increased the maximum ion charge state from C4+ to C6+ and boosted ion yield by approximately sixfold compared to DC voltage application.

Conclusions:

  • The laser-assisted spark-discharge ion source is an effective technique for producing high charge state carbon ions.
  • This hybrid approach offers a significant improvement in ion generation efficiency over conventional methods.
  • The findings pave the way for enhanced ion beam applications requiring high-flux, high-charge-state ions.