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MeV particles from laser-initiated processes in ultra-dense deuterium D(−1)

Journal article
Authors Leif Holmlid
Published in European Physical Journal A
Volume 48
Issue 2
Pages artikel nr 11
ISSN 1434-6001
Publication year 2012
Published at Department of Chemistry and Molecular Biology
Pages artikel nr 11
Language en
Links www.springerlink.com/content/57pu55...
Keywords Fusion, ultra-dense deuterium, MeV particles, protons
Subject categories Ion physics, Plasma physics, Fusion

Abstract

Fast particles from laser-induced processes in ultra-dense deuterium D(−1) are studied. The time of flight shows very fast particles, with energy above MeV. Such particles can be delayed or prevented from reaching the detector by inserting thin or thick metal foils in the beam to the detector. This distinguishes them from energetic photons which pass through the foils without delays. Due to the ultra-high density in D(−1) of 1029 cm −3, the range for 3MeV protons in this material is only 700 pm. The fast particles ejected and detected are thus mainly deuterons and protons from the surface of the material. MeV particles are expected to signify fusion processes D+D in the material. The number of fast particles released is determined using the known gain of the photomultiplier. The total number of fast particles formed, assuming isotropic emission, is less than 109 per laser pulse at < 200mJ pulse energy and intensity 1012Wcm −2. A fast shockwave with 30 keVu −1 kinetic energy is observed.

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