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<p>The Busan Ion Beam Accelerator (BIBA) is a compact linear accelerator facility utilizing the 28&#xa0;GHz Superconducting Electron Cyclotron Resonance Ion Source (SC-ECRIS) at the Korea Basic Science Institute (KBSI). The SC-ECRIS is designed to operate at 28&#xa0;GHz with a maximum microwave power of 10&#xa0;kW. However, significant X-ray emission is observed during the operation of the SC-ECRIS, caused by high-energy electrons confined within the plasma. These X-rays are absorbed by the cold mass of the superconducting magnet, leading to an additional heat load on the cryostat system. Therefore, developing a radiation-shielded cryostat is essential to ensure the reliable operation of the cryostat system. In this paper, X-ray energy distribution was measured during the operation of the 28&#xa0;GHz SC-ECRIS using a Cd–Zn–Te detector combined with a collimator to analyze the X-ray emission. Furthermore, the performance of radiation shielding materials under different conditions was measured and compared through Monte Carlo N-Particle (MCNP) simulations. As a result, a radiation-shielded cryostat of 28&#xa0;GHz SC-ECRIS was fabricated, and its radiation shielding performance was confirmed to be sufficient for ensuring the stable operation of the cryostat system.</p>

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Development of a radiation-shielded cryostat for the 28 GHz superconducting electron cyclotron resonance ion source

  • 期刊论文

  • 发表日期：

    2025年4月11日

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  • Jonggi Hong,
  • Seongjun Kim,
  • Jung-Woo Ok,
  • Taekyu Lee,
  • Byung-Hyun Shin,
  • Jang-Hee Yoon,
  • Jinyong Park,
  • Jiho Lee

摘要

The Busan Ion Beam Accelerator (BIBA) is a compact linear accelerator facility utilizing the 28 GHz Superconducting Electron Cyclotron Resonance Ion Source (SC-ECRIS) at the Korea Basic Science Institute (KBSI). The SC-ECRIS is designed to operate at 28 GHz with a maximum microwave power of 10 kW. However, significant X-ray emission is observed during the operation of the SC-ECRIS, caused by high-energy electrons confined within the plasma. These X-rays are absorbed by the cold mass of the superconducting magnet, leading to an additional heat load on the cryostat system. Therefore, developing a radiation-shielded cryostat is essential to ensure the reliable operation of the cryostat system. In this paper, X-ray energy distribution was measured during the operation of the 28 GHz SC-ECRIS using a Cd–Zn–Te detector combined with a collimator to analyze the X-ray emission. Furthermore, the performance of radiation shielding materials under different conditions was measured and compared through Monte Carlo N-Particle (MCNP) simulations. As a result, a radiation-shielded cryostat of 28 GHz SC-ECRIS was fabricated, and its radiation shielding performance was confirmed to be sufficient for ensuring the stable operation of the cryostat system.