Observation of repetitive bursts in emission of fast ions and neutrons in sub-nanosecond laser-solid experiments

J. Krása*, D. Klír, A. Velyhan, D. Margarone, E. Krouský, K. Jungwirth, J. Skála, M. Pfeifer, J. Kravárik, P. Kubeš, K. Řezáč, J. Ullschmied

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

A massive deuterated polyethylene target was exposed to laser intensities of about 3 × 1016 W/cm2 employing the 3-TW Prague Asterix Laser System (PALS). We achieved a yield of 2 × 108 neutrons per laser shot. Average time-of-flight signals of scintillation detectors operated in current mode reveal broad energy spectra of fusion neutrons with dominating energy of about 2.45 MeV. The energy dependence of the neutron yield shows a consistency in results of nanosecond, picosecond and sub-picosecond experiments. Here we also show that ions emitted in the backward direction from the front target surface have a multi-peak energy spectrum, which is caused by burst emission mechanisms.

Original languageEnglish
Pages (from-to)395-401
Number of pages7
JournalLaser And Particle Beams
Volume31
Issue number3
DOIs
Publication statusPublished - 01 Sep 2013
Externally publishedYes

Keywords

  • Bursts in ion emission
  • Laser-plasma interactions
  • Neutron yield scaling

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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