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Proceedings Paper

CVD diamond detectors for current mode neutron time-of-flight spectroscopy at OMEGA/NIF
Author(s): Gregory J. Schmid; Vladimir Yu. Glebov; Allen V. Friensehner; Dana R. Hargrove; Steven P. Hatchett; Nobuhiko Izumi; Richard A. Lerche; Thomas W. Phillips; Thomas Craig Sangster; Christopher T. Silbernagel; Christian Stoeckl
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Paper Abstract

We have performed pulsed neutron and pulsed laser tests of a CVD diamond detector manufactured from DIAFILM, a commercial grade of CVD diamond. The laser tests were performed at the short pulse UV laser at Bechtel Nevada in Livermore, CA. The pulsed neutrons were provided by DT capsule implosions at the OMEGA laser fusion facility in Rochester, NY. From these tests, we have determined the impulse response to be 250 ps fwhm for an applied E-field of 500 V/mm. Additionally, we have determined the sensitivity to be 2.4 mA/W at 500 V/mm and 4.0 mA/W at 100 V/mm. These values are approximately 2 to 5x times higher than those reported for natural Type IIa diamond at similar E-field and thickness (1mm). These characteristics allow us to conceive of a neutron time-of-flight current mode spectrometer based on CVD diamond. Such an instrument would sit inside the laser fusion target chamber close to target chamber center (TCC), and would record neutron spectra fast enough such that backscattered neutrons and (gamma) rays from the target chamber wall would not be a concern. The acquired neutron spectra could then be used to extract DD fuel areal density from the downscattered secondary to secondary ratio.

Paper Details

Date Published: 21 December 2001
PDF: 8 pages
Proc. SPIE 4510, Charged Particle Detection, Diagnostics, and Imaging, (21 December 2001); doi: 10.1117/12.451260
Show Author Affiliations
Gregory J. Schmid, Lawrence Livermore National Lab. (United States)
Vladimir Yu. Glebov, Univ. of Rochester (United States)
Allen V. Friensehner, Lawrence Livermore National Lab. (United States)
Dana R. Hargrove, Lawrence Livermore National Lab. (United States)
Steven P. Hatchett, Lawrence Livermore National Lab. (United States)
Nobuhiko Izumi, Lawrence Livermore National Lab. (United States)
Richard A. Lerche, Lawrence Livermore National Lab. (United States)
Thomas W. Phillips, Lawrence Livermore National Lab. (United States)
Thomas Craig Sangster, Lawrence Livermore National Lab. (United States)
Christopher T. Silbernagel, Bechtel Nevada (United States)
Christian Stoeckl, Univ. of Rochester (United States)


Published in SPIE Proceedings Vol. 4510:
Charged Particle Detection, Diagnostics, and Imaging
Eric Munro; John A. Rouse, Editor(s)

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