High aspect ratio hard x-ray (> 100 keV) imager to measure hot electron preheat for indirectly driven capsule implosions on the National Ignition Facility

Conference · Tue May 01 00:00:00 EDT 2012

OSTI ID:1043660

Doppner, T; Dewald, E; Divol, L; Burns, S; Izumi, N; Kline, J; LaCaille, G; McNaney, J; Prasad, R; Thomas, C A; Glenzer, S H; Landen, O; Author, A; Author, S G; Author, T

We have fielded a multi-pinhole, hard x-ray (> 100 keV) imager to measure the spatially-resolved bremsstrahlung emission from energetic electrons slowing in a plastic ablator shell during indirectly driven implosions at the National Ignition Facility. These electrons are generated in laser plasma interactions, and are a source of preheat to the deuterium-tritium fuel that could limit the compressibility required for ignition and burn. Our hard x-ray imaging measurements allow to set an upper limit to the DT fuel preheat, which we find is acceptable in current capsule implosions on the NIF.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 1043660
• Report Number(s): LLNL-CONF-555371; TRN: US1203179
• Resource Relation: Conference: Presented at: High-Temperature Plasma Diagnostics Conference, Monterey, CA, United States, May 06 - May 10, 2012
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
42 ENGINEERING
ASPECT RATIO
BREMSSTRAHLUNG
COMPRESSIBILITY
ELECTRONS
IGNITION
IMPLOSIONS
LASERS
PLASMA
PLASMA DIAGNOSTICS
PLASTICS
TAIL ELECTRONS
US NATIONAL IGNITION FACILITY