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Updated: Mar 24, 2026

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Pre-conditioning procedure suitable for internal-RF-antenna of J-PARC RF-driven H⁻ ion source.

A Ueno1, K Ohkoshi1, K Ikegami1

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The Review of Scientific Instruments
|March 3, 2016
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Summary

The Japan Proton Accelerator Research Complex (J-PARC) demonstrated 1 MW beam power using its H(-) ion source. A new antenna coating and pre-conditioning method significantly reduced RF-antenna failures during operation.

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Area of Science:

  • Particle Accelerator Technology
  • Plasma Physics
  • Ion Source Development

Background:

  • The Japan Proton Accelerator Research Complex (J-PARC) utilizes a cesiated RF-driven H(-) ion source for high-intensity beam generation.
  • Achieving the design beam power of 1 MW is crucial for J-PARC's experimental capabilities.
  • Initial operation phases experienced significant radio frequency (RF) antenna failures, hindering consistent performance.

Purpose of the Study:

  • To investigate the causes of RF-driven H(-) ion source antenna failures at J-PARC.
  • To develop and implement strategies for reducing antenna failure rates.
  • To ensure the reliable operation of the J-PARC ion source at its design power.

Main Methods:

  • Operation of the J-PARC cesiated RF-driven H(-) ion source for approximately one year.
  • Analysis of antenna failure modes during the initial operational period.
  • Modification of antenna design with thicker coatings and optimization of pre-conditioning procedures.

Main Results:

  • Demonstrated world-brightest level beam, achieving J-PARC's design beam power of 1 MW.
  • Identified initial antenna failures primarily during pre-conditioning stages.
  • Reduced antenna failure rate drastically through the use of thicker antenna coatings and a refined pre-conditioning protocol.

Conclusions:

  • The J-PARC H(-) ion source can reliably achieve 1 MW beam power.
  • Optimized antenna design and pre-conditioning are critical for mitigating RF-antenna failures.
  • The implemented improvements ensure sustained and high-performance operation of the ion source.