Ultrathick Boron Carbide Coatings for Nuclear Fusion Targets

Journal Article · 03 May 2023 · Fusion Science and Technology

DOI: https://doi.org/10.1080/15361055.2023.2194238 · OSTI ID:2006767

Shin, Swanee J.  ^[1]; Bayu Aji, Leonardus B. ^[1]; Engwall, Alison M. ^[1]; Bae, John H. ^[2]; Taylor, Gregory V. ^[1]; Mirkarimi, Paul B. ^[1]; Aracne-Ruddle, Chantel ^[1]; Nguyen, Jack ^[1]; Kong, Casey W. N. ^[2]; Kucheyev, Sergei O. ^[1]

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1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
2. General Atomics, San Diego, CA (United States)

Boron carbide is an attractive ablator for next-generation inertial confinement fusion (ICF) targets. Here we describe several aspects of our ongoing systematic studies of the deposition and processing of B₄C coatings for ICF targets. We show that residual compressive stress in films can be reduced and the deposition rate increased by N-doping. Further, we also demonstrate successful Si substrate etching and surface polishing and discuss remaining challenges and offer potential solutions to the buildup of particulates in the deposition chamber during prolonged coating runs, control of nodular growth defects, and lateral nonuniformity of film properties for deposition conditions with relatively low target-to-substrate distances.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
• Grant/Contract Number: AC52-07NA27344; 89233119CNA000063
• OSTI ID: 2006767
• Report Number(s): LLNL-JRNL-840162; 1061358; TRN: US2405880
• Journal Information: Fusion Science and Technology, Vol. 79, Issue 7; ISSN 1536-1055
• Publisher: Taylor & FrancisCopyright Statement
• Country of Publication: United States
• Language: English