Status of cryogenic layering for NIF ignition targets

Conference · Mon Oct 20 00:00:00 EDT 2008

DOI:https://doi.org/10.1088/1742-6596/112/3/032064· OSTI ID:945712

Moody, J D; Kozioziemski, B J; Mapoles, E R; Sater, J D; Dewald, E L; Koch, J A; Izumi, N; Chernov, A; Salmonson, J; Montesanti, R C; Atherton, L J; Burmann, J A; Pipes, J W; Stefanescu, D; Salari, K; Weisgrabber, T; Reynolds, J; Castro, C; Klingmann, J; Dzenitis, B

Recent advances in cryogenic layering include improved surface roughness characterization of many layers formed using 'slow-cool' and 'rapid-cool' protocols. At 0.25 K below the melt, slow-cooled layers meet the NIF smoothness requirement. However, at 1.5 K below the melt grain-boundary misalignments dominate the layer roughness and cause it to exceed the smoothness specification. Rapid-cool of the layer to 1.5 K below the melt shows promise for meeting the ignition requirements. Much of the current research effort is aimed at characterizing the onset of roughness during rapid cooling and determining the scale of the resulting roughness.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 945712
• Report Number(s): LLNL-CONF-408346; TRN: US200903%%748
• Resource Relation: Journal Volume: 112; Journal Issue: 3; Conference: Presented at: IFSA 2007, Kobe, Japan, Sep 09 - Sep 14, 2007
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CRYOGENICS
IGNITION
ROUGHNESS
TARGETS