Direct-drive–ignition designs with mid-Z ablators

Lafon, M.; Betti, R.; Anderson, K. S.; Collins, T. J.  B.; Epstein, R.; McKenty, P. W.; Myatt, J. F.; Shvydky, A.; Skupsky, S.

doi:10.1063/1.4914835

Direct-drive–ignition designs with mid-Z ablators

Journal Article · Sun Mar 01 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4914835· OSTI ID:1178086

Lafon, M. ^[1]; Betti, R. ^[2]; Anderson, K. S. ^[3]; Collins, T. J. B. ^[3]; ^[3]; McKenty, P. W. ^[3]; Myatt, J. F. ^[3]; Shvydky, A. ^[3]; Skupsky, S. ^[3]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics and Fusion Science Center; Laboratory for Laser Energetics, University of Rochester, Rochester, NY
Univ. of Rochester, NY (United States). Lab. for Laser Energetics and Fusion Science Center
Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Achieving thermonuclear ignition using direct laser illumination relies on the capability to accelerate spherical shells to high implosion velocities while maintaining shell integrity. Ablator materials of moderate atomic number Z reduce the detrimental effects of laser–plasma instabilities in direct-drive implosions. To validate the physics of moderate-Z ablator materials for ignition target designs on the National Ignition Facility (NIF), hydro-equivalent targets are designed using pure plastic (CH), high-density carbon, and glass (SiO2) ablators. The hydrodynamic stability of these targets is investigated through two-dimensional (2D) single-mode and multimode simulations. The overall stability of these targets to laser-imprint perturbations and low-mode asymmetries makes it possible to design high-gain targets. Designs using polar-drive illumination are developed within the NIF laser system specifications. Mid-Z ablator targets are an attractive candidate for direct-drive ignition since they present better overall performance than plastic ablator targets through reduced laser–plasma instabilities and a similar hydrodynamic stability.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-04ER54789; FC52-08NA28302; NA0001944

OSTI ID:: 1178086

Alternate ID(s):: OSTI ID: 1228561
OSTI ID: 22408215

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 22; ISSN PHPAEN; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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