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<p>This paper describes a modified plasma electrode (PE) configuration for an Accel–Decel ion extraction system aimed at enhancing ion beam optical quality. The conventional linear PE is replaced by a curved profile based on a hyper­bolic tangent function, and its influence on beam emittance and extracted current is studied systematically using the IBSimu simulation. The reference design is a 2.45 GHz electron cyclotron resonance (ECR) proton source originally with a linear PE structure. A new curved geometry parameterized by the adjustable curvature factor <i>b</i> is conceived and thoroughly studied. The simulation results indicate that the new structure reduces the root-mean-square (RMS) emittance by more than five orders of magnitude from the conventional linear geometry with relatively comparable beam current. Besides, the effect of PE aperture diameter on beam quality is also studied. These findings present important guidelines for the design of high-performance ion extraction systems with improved beam quality and preserved current efficiency.</p>

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Curved plasma electrode design in accel–decel ion extraction systems: a simulation-driven approach for emittance reduction

  • 期刊论文

  • 发表日期：

    2025年10月20日

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  • Seyed Mortaza Taheri Balanoji,
  • Seyed Mojtaba Taheri Balanoji

摘要

This paper describes a modified plasma electrode (PE) configuration for an Accel–Decel ion extraction system aimed at enhancing ion beam optical quality. The conventional linear PE is replaced by a curved profile based on a hyper­bolic tangent function, and its influence on beam emittance and extracted current is studied systematically using the IBSimu simulation. The reference design is a 2.45 GHz electron cyclotron resonance (ECR) proton source originally with a linear PE structure. A new curved geometry parameterized by the adjustable curvature factor b is conceived and thoroughly studied. The simulation results indicate that the new structure reduces the root-mean-square (RMS) emittance by more than five orders of magnitude from the conventional linear geometry with relatively comparable beam current. Besides, the effect of PE aperture diameter on beam quality is also studied. These findings present important guidelines for the design of high-performance ion extraction systems with improved beam quality and preserved current efficiency.