In situ calibration of the Gamma Reaction History instrument using reference samples (“pucks”) for areal density measurements
1 Los Alamos National Laboratory, PO Box 1663, Los Alamos, New Mexico 87545, USA
2 Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, UK
3 Lawrence Livermore National Laboratory, Livermore, California 94550, USA
4 National Security Technologies, LLC, Santa Barbara, California 93111, USA
5 Colorado School of Mines, Golden, Colorado 80401, USA
6 Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
Published online: 15 November 2013
The introduction of a sample of carbon, for example a disk or “puck”, near an imploding DT-filled capsule creates a source of 12C gamma rays that can serve as a reference for calibrating the response of the Gamma Reaction History (GRH) detector . Such calibration is important in the measurement of ablator areal density ⟨ρR⟩abl in plastic-ablator DT-filled capsules at OMEGA , by allowing ⟨ρR⟩abl to be inferred as a function of ratios of signals rather than from absolute measurements of signal magnitudes. Systematic uncertainties in signal measurements and detector responses therefore cancel, permitting more accurate measurements of ⟨ρR⟩abl.
© Owned by the authors, published by EDP Sciences, 2013
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