Ultrafast Time-Integrated Diagnosis of Laser-Heated Deuterium Ions in Dense Plasma via Fusion Neutron Spectra

Jie Feng; Hao Xu; Mingxuan Wei; Mingyang Zhu; Xichen Hu; Bingzhan Shi; Fuyuan Wu; Weijun Zhou; Wenchao Yan; Guoqiang Zhang; Jinguang Wang; Yifei Li; Xin Lu; Liming Chen

doi:10.34133/ultrafastscience.0125

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Ultrafast Time-Integrated Diagnosis of Laser-Heated Deuterium Ions in Dense Plasma via Fusion Neutron Spectra

Research Article | Updated：2026-03-12

- Ultrafast Time-Integrated Diagnosis of Laser-Heated Deuterium Ions in Dense Plasma via Fusion Neutron Spectra
- Ultrafast Science Vol. 6, Issue 1, (2026)
- Affiliations：
  
  1. School of Physics and Astronomy, State Key Laboratory of Dark Matter Physics, Key Laboratory for Laser Plasmas, Shanghai Jiao Tong University,Shanghai,China,200240
  2. IFSA Collaborative Innovation Center, Shanghai Jiao Tong University,Shanghai,China,200240
  3. Shanghai Advanced Research Institute, Chinese Academy of Sciences,Shanghai,China,201210
  4. Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,Beijing,China,100190
  5. School of Physical Sciences, University of Chinese Academy of Sciences,Beijing,China,100049
  6. Songshan Lake Materials Laboratory,Dongguan,China,523808
- Author bio：
- Funds：
- DOI：10.34133/ultrafastscience.0125
  CLC：
- Online First：09 February 2026，
  
  Published：09 February 2026
- Accepted：
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Jie Feng, Hao Xu, Mingxuan Wei, et al. Ultrafast Time-Integrated Diagnosis of Laser-Heated Deuterium Ions in Dense Plasma via Fusion Neutron Spectra[J]. Ultrafast Science, 2026, 6(1).
DOI：

Jie Feng, Hao Xu, Mingxuan Wei, et al. Ultrafast Time-Integrated Diagnosis of Laser-Heated Deuterium Ions in Dense Plasma via Fusion Neutron Spectra[J]. Ultrafast Science, 2026, 6(1). DOI： 10.34133/ultrafastscience.0125.

摘要

Abstract

The ultrafast time-integrated diagnosis of ions plays a vital role in high-energy-density physics research. However

it is extremely challenging to measure in experiment. Here

we demonstrate a reliable approach for investigating the dynamics of deuterium ions in dense plasma. By irradiating a heavy water stream with the hundred Hertz repetitive intense femtosecond laser pulses

the neutrons from the reaction can be detected via a single time-of-flight detector to accumulate the spectrum with a fine energy resolution. This spectrum has been utilized to calculate the temperature and angular distribution of deuterium ions transported in plasma. The calculated results are well verified by particle-in-cell simulations of deuterium ions dynamics. Our method paves a new way for diagnosing ions’ picosecond time-integrated dynamics in plasma and holds great potential for understanding the ions’ transport process in high-energy-density matters and studying laser plasma ion acceleration.

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