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Neutron time-of-flight measurements of charged-particle energy loss in inertial confinement fusion plasmas
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(2019) Neutron time-of-flight measurements of charged-particle energy loss in inertial confinement fusion plasmas. Physical Review Letters, 123 (16). 165001. doi:10.1103/PhysRevLett.123.165001 ISSN 0031-9007.
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Official URL: https://doi.org/10.1103/PhysRevLett.123.165001
Abstract
Neutron spectra from secondary ^{3}H(d,n)α reactions produced by an implosion of a deuterium-gas capsule at the National Ignition Facility have been measured with order-of-magnitude improvements in statistics and resolution over past experiments. These new data and their sensitivity to the energy loss of fast tritons emitted from thermal ^{2}H(d,p)^{3}H reactions enable the first statistically significant investigation of charged-particle stopping via the emitted neutron spectrum. Radiation-hydrodynamic simulations, constrained to match a number of observables from the implosion, were used to predict the neutron spectra while employing two different energy loss models. This analysis represents the first test of stopping models under inertial confinement fusion conditions, covering plasma temperatures of k_{B}T≈1-4 keV and particle densities of n≈(12-2)×10^{24} cm^{-3}. Under these conditions, we find significant deviations of our data from a theory employing classical collisions whereas the theory including quantum diffraction agrees with our data.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QC Physics | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
SWORD Depositor: | Library Publications Router | ||||||
Library of Congress Subject Headings (LCSH): | Neutrons -- Spectra , Time-of-flight mass spectrometry, Controlled fusion, Plasma confinement | ||||||
Journal or Publication Title: | Physical Review Letters | ||||||
Publisher: | American Physical Society | ||||||
ISSN: | 0031-9007 | ||||||
Official Date: | 17 October 2019 | ||||||
Dates: |
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Volume: | 123 | ||||||
Number: | 16 | ||||||
Article Number: | 165001 | ||||||
DOI: | 10.1103/PhysRevLett.123.165001 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Copyright Holders: | © 2019 American Physical Society | ||||||
Date of first compliant deposit: | 15 January 2020 | ||||||
Date of first compliant Open Access: | 15 January 2020 |
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