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All sourcesNASA NTRSDOE OSTI
DOE OSTI2025

Demonstration of a Novel Radiochemical Mix Diagnostic for Fusion Implosions at the National Ignition Facility

Mixing of the ablator material into the fuel of an inertial confinement fusion implosion reduces compression and enhances radiative losses, preventing ignition. Here, we describe a novel use of charged-particle radiochemistry to measure the ablator mix in contact with the fusion hot spot. The capsule uses a graded Be-Cr layer to increase the confinement of the hot spot. 52 Mn and 51 Cr isotopes are collected from the implosion and counted, and the ratio is related to the amount of Cr mixed into the hot spot. Thus, a new diagnostic to determine the degradation due to mix on fusion implosions has been developed.

MacLaren, S. A. [Lawrence Livermore National Labor↗
DOE OSTI2020

Materials Data on Be12Cr by Materials Project

CrBe12 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are three inequivalent Be sites. In the first Be site, Be is bonded in a 12-coordinate geometry to ten Be and two equivalent Cr atoms. There are a spread of Be–Be bond distances ranging from 2.09–2.35 Å. Both Be–Cr bond lengths are 2.56 Å. In the second Be site, Be is bonded to ten Be and two equivalent Cr atoms to form a mixture of distorted corner, edge, and face-sharing BeBe10Cr2 cuboctahedra. There are two shorter (2.06 Å) and four longer (2.19 Å) Be–Be bond lengths. Both Be–Cr bond lengths are 2.74 Å. In the third Be site, Be is bonded in a 10-coordinate geometry to nine Be and one Cr atom. The Be–Be bond length is 2.18 Å. The Be–Cr bond length is 2.50 Å. Cr is bonded in a 12-coordinate geometry to twenty Be atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Be2Cr by Materials Project

Be2Cr is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Be sites. In the first Be site, Be is bonded to six Be and six equivalent Cr atoms to form a mixture of edge, face, and corner-sharing BeBe6Cr6 cuboctahedra. There are a spread of Be–Be bond distances ranging from 2.06–2.14 Å. There are two shorter (2.45 Å) and four longer (2.47 Å) Be–Cr bond lengths. In the second Be site, Be is bonded to six equivalent Be and six equivalent Cr atoms to form a mixture of edge, face, and corner-sharing BeBe6Cr6 cuboctahedra. All Be–Cr bond lengths are 2.46 Å. Cr is bonded in a 12-coordinate geometry to twelve Be and four equivalent Cr atoms. There are three shorter (2.56 Å) and one longer (2.62 Å) Cr–Cr bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BeCr3 by Materials Project

BeCr3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Be is bonded to twelve equivalent Cr atoms to form BeCr12 cuboctahedra that share corners with twelve equivalent BeCr12 cuboctahedra, edges with twenty-four equivalent CrBe4Cr8 cuboctahedra, faces with six equivalent BeCr12 cuboctahedra, and faces with twelve equivalent CrBe4Cr8 cuboctahedra. All Be–Cr bond lengths are 2.48 Å. Cr is bonded to four equivalent Be and eight equivalent Cr atoms to form CrBe4Cr8 cuboctahedra that share corners with twelve equivalent CrBe4Cr8 cuboctahedra, edges with eight equivalent BeCr12 cuboctahedra, edges with sixteen equivalent CrBe4Cr8 cuboctahedra, faces with four equivalent BeCr12 cuboctahedra, and faces with fourteen equivalent CrBe4Cr8 cuboctahedra. All Cr–Cr bond lengths are 2.48 Å.

36 MATERIALS SCIENCE↗