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

## TL;DR

This paper presents a novel ultrashort time-integrated diagnostic method for analyzing deuterium ion dynamics in dense plasma using fusion neutron spectra, verified by simulations and applicable to high-energy density physics.

## Contribution

It introduces a reliable approach to measure ion temperature and angular distribution in dense plasma through neutron spectra, enabling picosecond time-integrated diagnostics.

## Key findings

- Neutron spectra accurately reveal deuterium ion temperature and distribution.
- Method successfully verified by particle-in-cell simulations.
- Potential applications in laser plasma ion acceleration and high-energy density physics.

## Abstract

The ultrashort 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 D(D,n)3He 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. And the calculated results are well verified by particle-in-cell simulations of deuterium ions dynamics. Our method paves a new way for diagnosing ions picoseconds 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.