High‐sensitivity scintillating‐fiber imaging detector for high‐energy neutrons
作者:
D. Ress,
R. A. Lerche,
R. J. Ellis,
G. W. Heaton,
D. E. Lehr,
期刊:
Review of Scientific Instruments
(AIP Available online 1995)
卷期:
Volume 66,
issue 10
页码: 4943-4948
ISSN:0034-6748
年代: 1995
DOI:10.1063/1.1146179
出版商: AIP
数据来源: AIP
摘要:
We have created a detector to image the neutrons emitted by imploded inertial‐confinement fusion targets. The 14 MeV neutrons, which are produced by deuterium–tritium fusion events in the target, pass through an aperture to create an image on the detector. The neutron radiation is converted to blue light (430 nm) with a 20 cm2array of plastic scintillating fibers. Each fiber is 10 cm long with a 1 mm2cross section; approximately 35 000 fibers make up the array. The resulting blue‐light image is reduced in size and amplified by a sequence of fiber‐optic tapers and image intensifiers, then acquired by a charge‐coupled device camera. The fiber‐optic readout system was tested separately for overall throughput and spatial resolution; the throughput was 0.22 electrons/photon, and the resolution was 0.8 mm. We also characterized the overall efficiency of the detector using the DT‐fusion neutrons emitted by inertial confinement targets; the measured value was 14 electrons/pixel/neutron. Several neutron images of laser‐fusion targets have been obtained with the detector. We describe the detector, present characterization results, and give examples of the neutron images. ©1995 American Institute of Physics.
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