Investigating the impact of intermediate-mode perturbations on diagnosing plasma conditions in DT cryogenic implosions via synthetic x-ray Thomson scattering

Journal article

The pursuit of inertial confinement fusion ignition target designs requires precise experimental validation of the conditions within imploding capsules, in particular the density and temperature of the compressed shell. Previous work has identified X-ray Thomson scattering (XRTS) as a viable diagnostic tool for inferring the in-flight compressed deuterium-tritium shell conditions during capsule implosions [1]. However, this study focused on one-dimensional simulations, which do not account for the growth of hydrodynamic instabilities. In this work, two-dimensional DRACO simulations incorporating intermediate-mode perturbations up to Legendre mode ℓ = 50 were used to generate synthetic XRTS spectra with the SPECT3D code. The analysis employed Markov-Chain Monte Carlo techniques to infer plasma conditions from these spectra. The results demonstrate that the XRTS diagnostic platform can effectively discern the in-flight compressed shell conditions for targets with varying adiabats, even in the presence of intermediate-mode perturbations. This work underscores the potential of XRTS for realistic inertial confinement fusion experiments, providing a robust method for probing the complex dynamics of fusion implosions.

Authors: Poole, H; Cao, D; Epstein, R; Golovkin, I; Goncharov, VN

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: IOP Publishing
• Journal: Plasma Physics and Controlled Fusion
• Volume: 67
• Issue: 1
• Article number: 015034
• Publication date: 2024-12-30
• Acceptance date: 2024-12-12
• DOI: 10.1088/1361-6587/ad9e74
• EISSN: 1361-6587
• ISSN: 0741-3335
• Language: English
• Keywords: x-ray Thomson scattering; FFR; Bayesian analysis; inertial confinement fusion; DT cryogenic implosions