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Distortions in Charged-Particle Images of Laser Direct-Drive Inertial Confinement Fusion Implosions

Fuente: arXiv

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Détails bibliographiques
Auteurs principaux:	Heuer, P. V., Peebles, J. L., Kunimune, J., Rinderknecht, H. G., Davies, J. R., Gopalaswamy, V., Frelier, J., Scott, M., Roberts, J., Brannon, B., McClow, H., Fairbanks, R., Regan, S. P., Frenje, J. A., Johnson, M. Gatu, Séguin, F. H., Crilly, A. J., Appelbe, B. D., Farrell, M., Stutz, J.
Format:	Preprint
Publié:	2024
Sujets:	Plasma Physics
Accès en ligne:	Acceder al recurso
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author	Heuer, P. V. Peebles, J. L. Kunimune, J. Rinderknecht, H. G. Davies, J. R. Gopalaswamy, V. Frelier, J. Scott, M. Roberts, J. Brannon, B. McClow, H. Fairbanks, R. Regan, S. P. Frenje, J. A. Johnson, M. Gatu Séguin, F. H. Crilly, A. J. Appelbe, B. D. Farrell, M. Stutz, J.
author_facet	Heuer, P. V. Peebles, J. L. Kunimune, J. Rinderknecht, H. G. Davies, J. R. Gopalaswamy, V. Frelier, J. Scott, M. Roberts, J. Brannon, B. McClow, H. Fairbanks, R. Regan, S. P. Frenje, J. A. Johnson, M. Gatu Séguin, F. H. Crilly, A. J. Appelbe, B. D. Farrell, M. Stutz, J.
contents	Energetic charged particles generated by inertial confinement fusion (ICF) implosions encode information about the spatial morphology of the hot-spot and dense fuel during the time of peak fusion reactions. The knock-on deuteron imager (KoDI) was developed at the Omega Laser Facility to image these particles in order to diagnose low-mode asymmetries in the hot-spot and dense fuel layer of cryogenic deuterium--tritium ICF implosions. However, the images collected are distorted in several ways that prevent reconstruction of the deuteron source. In this paper we describe these distortions and a series of attempts to mitigate or compensate for them. We present several potential mechanisms for the distortions, including a new model for scattering of charged particles in filamentary electric or magnetic fields surrounding the implosion. Particle-tracing is used to create synthetic KoDI data based on the filamentary field model that reproduces the main experimentally observed image distortions. We conclude that the filamentary scattering model best matches the observed image distortions. Finally, we discuss potential impacts of filamentary fields on other charged-particle diagnostics.
format	Preprint
id	arxiv_https___arxiv_org_abs_2412_03362
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Distortions in Charged-Particle Images of Laser Direct-Drive Inertial Confinement Fusion Implosions Heuer, P. V. Peebles, J. L. Kunimune, J. Rinderknecht, H. G. Davies, J. R. Gopalaswamy, V. Frelier, J. Scott, M. Roberts, J. Brannon, B. McClow, H. Fairbanks, R. Regan, S. P. Frenje, J. A. Johnson, M. Gatu Séguin, F. H. Crilly, A. J. Appelbe, B. D. Farrell, M. Stutz, J. Plasma Physics Energetic charged particles generated by inertial confinement fusion (ICF) implosions encode information about the spatial morphology of the hot-spot and dense fuel during the time of peak fusion reactions. The knock-on deuteron imager (KoDI) was developed at the Omega Laser Facility to image these particles in order to diagnose low-mode asymmetries in the hot-spot and dense fuel layer of cryogenic deuterium--tritium ICF implosions. However, the images collected are distorted in several ways that prevent reconstruction of the deuteron source. In this paper we describe these distortions and a series of attempts to mitigate or compensate for them. We present several potential mechanisms for the distortions, including a new model for scattering of charged particles in filamentary electric or magnetic fields surrounding the implosion. Particle-tracing is used to create synthetic KoDI data based on the filamentary field model that reproduces the main experimentally observed image distortions. We conclude that the filamentary scattering model best matches the observed image distortions. Finally, we discuss potential impacts of filamentary fields on other charged-particle diagnostics.
title	Distortions in Charged-Particle Images of Laser Direct-Drive Inertial Confinement Fusion Implosions
topic	Plasma Physics
url	https://arxiv.org/abs/2412.03362