Knock-on deuteron imaging for diagnosing the morphology of an ICF implosion at OMEGA
Name
5.0096786.pdf
Description
Published version
Size
5.49 MB
Format
Adobe PDF
Checksum (MD5)
fc0f533e34eaf0b9525167bfebd75e9c
Author(s)
Kunimune, JH
Rinderknecht, HG
Adrian, PJ
Heuer, PV
Regan, SP
Séguin, FH
Gatu Johnson, M
Bahukutumbi, RP
Knauer, JP
Bachmann, BL
Date Issued
July 2022
Journal
Physics of Plasmas
Publisher
AIP Publishing
Citation
Kunimune, JH, Rinderknecht, HG, Adrian, PJ, Heuer, PV, Regan, SP et al. 2022. "Knock-on deuteron imaging for diagnosing the morphology of an ICF implosion at OMEGA." Physics of Plasmas, 29 (7).
Version
Final published version
Abstract
Knock-on deuteron imaging is a new diagnostic technique that is being implemented at the OMEGA laser facility to diagnose the morphology of an inertial confinement fusion (ICF) implosion. It utilizes the fact that some of the neutrons from deuterium–tritium (DT)-fusion reactions generated in the central hot-spot of an ICF implosion elastically scatter deuterons as they traverse the surrounding shell layer. The energy of these “knock-on” deuterons depends on the scattering angle, where the most energetic deuterons are forward-scattered and probe the shape of the central hot-spot, while lower-energy deuterons are made by side-scattering or slowing down in the fuel and carry information about the distribution of the dense DT-fuel layer surrounding the hot-spot. The first proof-of-concept tests have been conducted successfully. In these tests, three penumbral imagers with different views on an implosion recorded deuterons scattered from the dense shell of DT-gas-filled deuterated plastic shell implosions with prescribed offsets. Data from these experiments are presented here, along with novel analysis techniques that iteratively reconstruct the deuteron source from the data. Reconstructed hot-spot and shell radii agree with 1D hydro simulations and indicate a P1 asymmetry in the direction of the offset. A comparison of coaxial deuteron and x-ray images suggests the presence of a mix between the hot-spot and shell on the order of 15 μm. This new diagnostic capability will allow us to study asymmetries in unprecedented detail at OMEGA.
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/5.0096786
