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<p>Laser-cluster fusion offers a unique compact platform for studying nuclear reactions in the sub-100&#xa0;keV regime. Here we report the first experimental demonstration of secondary beam-target DD fusion reactions in laser-cluster fusion experiments by surrounding a CD<sub>4</sub> cluster jet with a CD<sub>2</sub> foil. Deuterons accelerated to high ion temperatures of 60–100&#xa0;keV through Coulomb explosion interacted with the surrounding CD<sub>2</sub> target, enhancing neutron yields by up to a factor of 3.5 compared with the cluster-only case. This enhancement was quantitatively reproduced by a time-resolved model, confirming the effectiveness of the additional target. Our results demonstrate a practical route to boost neutron production and to establish laser-cluster fusion as a compact platform for investigating a wider range of fusion reactions and cross-sections relevant to astrophysics.</p>

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Fusion yield enhancement via secondary beam-target reactions in laser-cluster experiments

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月17日

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  • Jun Sim,
  • Seongmin Lee,
  • Hyeong-il Kim,
  • Youhwan Noh,
  • Jaehyun Song,
  • Chiwan Song,
  • Junho Won,
  • Woosuk Bang

摘要

Laser-cluster fusion offers a unique compact platform for studying nuclear reactions in the sub-100 keV regime. Here we report the first experimental demonstration of secondary beam-target DD fusion reactions in laser-cluster fusion experiments by surrounding a CD4 cluster jet with a CD2 foil. Deuterons accelerated to high ion temperatures of 60–100 keV through Coulomb explosion interacted with the surrounding CD2 target, enhancing neutron yields by up to a factor of 3.5 compared with the cluster-only case. This enhancement was quantitatively reproduced by a time-resolved model, confirming the effectiveness of the additional target. Our results demonstrate a practical route to boost neutron production and to establish laser-cluster fusion as a compact platform for investigating a wider range of fusion reactions and cross-sections relevant to astrophysics.