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, R. 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.

doi:10.1063/5.0251899

Title: Distortions in charged-particle images of laser direct-drive inertial confinement fusion implosions

Journal Article · 07 April 2025 · Physics of Plasmas

DOI: https://doi.org/10.1063/5.0251899 · OSTI ID:2549522

;

; Fairbanks, R.;

;

; Appelbe, B. D.;

; Stutz, J.

Energetic charged particles generated by inertial confinement fusion (ICF) implosions encode information about the spatial morphology of the hotspot 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 hotspot 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.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; 89233119CNA000063; NA0004144

OSTI ID:: 2549522

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 32; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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