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High current DC negative ion source for cyclotron.

H Etoh1, M Onai2, Y Aoki1

  • 1Sumitomo Heavy Industries, Ltd., Tokyo 141-6025, Japan.

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|March 3, 2016
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Summary
This summary is machine-generated.

A new negative ion source for proton cyclotrons achieves high H(-) and D(-) beam currents. Cesium-seeded operation significantly boosts H(-) current while reducing power consumption.

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Area of Science:

  • Physics
  • Engineering
  • Medical Physics

Background:

  • Proton cyclotrons are crucial for medical applications, requiring efficient negative ion sources.
  • Current negative ion source technologies face challenges in beam current and operational efficiency.

Purpose of the Study:

  • To develop and characterize a filament-driven multi-cusp negative ion source for proton cyclotrons.
  • To investigate the performance of the ion source in both cesium-free and cesium-seeded operational modes.
  • To optimize operating parameters for enhanced negative hydrogen ion (H-) production.

Main Methods:

  • Experimental development and testing of a filament-driven multi-cusp negative ion source.
  • Evaluation of H(-) and D(-) beam currents under varying arc discharge power and gas flow rates.
  • Numerical simulation using the KEIO-MARC code to model H(-) production.

Main Results:

  • Stable continuous H(-) beam of 10 mA and D(-) beam of 3.3 mA achieved in Cs-free operation.
  • H(-) beam current reached 22 mA in Cs-seeded operation at lower arc power (2.6 kW).
  • Optimized gas flow rates were 15 sccm (Cs-free) and 4 sccm (Cs-seeded) for maximum H(-) current.

Conclusions:

  • The developed negative ion source demonstrates high performance for medical proton cyclotrons.
  • Cesium-seeding enhances H(-) production efficiency and reduces operational power requirements.
  • Numerical simulations provide a theoretical basis for the observed experimental results.