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Proceedings Paper

Neutron detector for fusion reaction-rate measurements
Author(s): Richard A. Lerche; D. W. Phillion; Gregory L. Tietbohl
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Paper Abstract

We have developed a fast, sensitive neutron detector for recording the fusion reaction-rate history of inertial-confinement fusion (ICF) experiments. The detector is based on the fast rise-time of a commercial plastic scintillator (BC-422) and has a response < 25 ps FWHM. A thin piece of scintillator material acts as a neutron-to-light converter. A zoom lens images light from the scintillator surface to a high-speed (15 ps) optical streak camera for recording. The zoom lens allows the scintillator to be positioned between 1 and 50 cm from a target. The camera simultaneously records an optical fiducial pulse which allows the camera time base to be calibrated relative to the incident laser power. Bursts of x rays formed by focusing 20 ps, 2.5 TW laser pulses onto gold disk targets demonstrate the detector resolution to be < 25 ps. We have recorded burn histories for deuterium/tritium-filled targets producing as few as 3 X 107 neutrons.

Paper Details

Date Published: 11 October 1993
PDF: 9 pages
Proc. SPIE 2002, Ultrahigh- and High-Speed Photography, Videography, and Photonics '93, (11 October 1993); doi: 10.1117/12.161361
Show Author Affiliations
Richard A. Lerche, Lawrence Livermore National Lab. (United States)
D. W. Phillion, Lawrence Livermore National Lab. (United States)
Gregory L. Tietbohl, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 2002:
Ultrahigh- and High-Speed Photography, Videography, and Photonics '93
Paul W. Roehrenbeck, Editor(s)

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