Overview of the Gamma Reaction History Diagnostic for the National Ignition Facility (NIF)

Conference · Wed Sep 01 00:00:00 EDT 2010 · Proc. SPIE

DOI:https://doi.org/10.1117/12.869102· OSTI ID:1055231

Malone, R M; Frogget, B C; Kaufman, M I; Tibbitts, A; Tunnell, T W; Evans, S C; Herrmann, H W; Kim, Y H; Mack, J M; Young, C S; McGillivray, K D; Palagi, M J; Stoeffl, W

The National Ignition Facility (NIF) has a need for measuring gamma radiation as part of a nuclear diagnostic program. A new gamma-detection diagnostic uses 90º off-axis parabolic mirrors to relay Cherenkov light from a volume of pressurized gas. This nonimaging optical system has the high-speed detector placed at a stop position with the Cherenkov light delayed until after the prompt gammas have passed through the detector. Because of the wavelength range (250 to 700 nm), the optical element surface finish was a key design constraint. A cluster of four channels (each set to a different gas pressure) will collect the time histories for different energy ranges of gammas.

• Research Organization: Nevada Test Site (NTS), Mercury, NV (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: DE-AC52-06NA25946
• OSTI ID: 1055231
• Report Number(s): DOE/NV/25946-991
• Journal Information: Proc. SPIE, Vol. 7642; Conference: International Optical Design Conference (IODC); Jackson Hole, Wyoming; June 13-17, 2010
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
gamma ray detection
National Ignition Facility
NIF
Cherenkov
nonimaging optics
off-axis parabolas