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<p>This study presents a coupled thermo-mechanical analysis of a Prompt Gamma Neutron Activation Analysis (PGAA) system using multiphysics simulations in COMSOL Multiphysics. The radiation induced heat source is derived from Monte Carlo particle transport calculations, ensuring a consistent coupling between radiation physics and thermal–mechanical response. Thermal results show that key components, including the steel collimator, aluminum structures, sapphire and bismuth filters, and the supermirror neutron guide, experience extremely low temperature increases on the order of ~ 10⁻³ K, confirming excellent thermal stability under operating conditions. Mechanical analysis reveals that stresses and deformations are highly localized, mainly affecting the HDPE rings, shutter assembly, and beam shaping components. Although peak von Mises stress locally exceeds 40&#xa0;MPa, these regions remain spatially limited and do not compromise the overall structural integrity of the system. Overall, the results demonstrate the robustness of the selected materials and the effectiveness of the geometric design. The integrated Monte Carlo and multiphysics approach provides a reliable framework for optimizing PGAA system performance, improving stability, accuracy, and long term operational reliability.</p>

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Coupled thermo-mechanical modeling of prompt gamma neutron activation analysis (PGAA) systems for performance optimization

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Jamila Yousfi,
  • Abdessamad Didi,
  • Lamiae Mrharrab,
  • Hamane Lemziouka,
  • El Arousy Fatima Zohra,
  • Hamid Amsil,
  • Iliasse Aarab,
  • Otman Jaï

摘要

This study presents a coupled thermo-mechanical analysis of a Prompt Gamma Neutron Activation Analysis (PGAA) system using multiphysics simulations in COMSOL Multiphysics. The radiation induced heat source is derived from Monte Carlo particle transport calculations, ensuring a consistent coupling between radiation physics and thermal–mechanical response. Thermal results show that key components, including the steel collimator, aluminum structures, sapphire and bismuth filters, and the supermirror neutron guide, experience extremely low temperature increases on the order of ~ 10⁻³ K, confirming excellent thermal stability under operating conditions. Mechanical analysis reveals that stresses and deformations are highly localized, mainly affecting the HDPE rings, shutter assembly, and beam shaping components. Although peak von Mises stress locally exceeds 40 MPa, these regions remain spatially limited and do not compromise the overall structural integrity of the system. Overall, the results demonstrate the robustness of the selected materials and the effectiveness of the geometric design. The integrated Monte Carlo and multiphysics approach provides a reliable framework for optimizing PGAA system performance, improving stability, accuracy, and long term operational reliability.