Scintillating fiber imaging detector for 14-MeV neutrons

David B. Ress; Richard A. Lerche; Raymond J. Ellis; G. W. Heaton; M. B. Nelson; G. Mant; D. E. Lehr

doi:10.1117/12.185813

7 September 1994 Scintillating fiber imaging detector for 14-MeV neutrons

David B. Ress, Richard A. Lerche, Raymond J. Ellis, G. W. Heaton, M. B. Nelson, G. Mant, D. E. Lehr

Proceedings Volume 2281, Scintillating Fiber Technology and Applications II; (1994) https://doi.org/10.1117/12.185813
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

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-cm-square array of plastic scintillating fibers. Each fiber is 10-cm long with a 1-mm-square cross section; approximately 35-thousand fibers make up the array. The resulting blue-light image is reduced and amplified by a sequence of fiber-optic tapers and image intensifiers, then acquired by a CCD camera. The fiber-optic readout system was tested optically for overall throughput and resolution. We plan to characterize the scintillator array using an ion-beam neutron source as well as DT-fusion neutrons emitted by inertial confinement targets. Characterization experiments will measure the light-production efficiency, spatial resolution, and neutron scattering within the detector. Several neutron images of laser-fusion targets have been obtained with the detector. We describe the detector and our characterization methods, present characterization results, and give examples of the neutron images.

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David B. Ress, Richard A. Lerche, Raymond J. Ellis, G. W. Heaton, M. B. Nelson, G. Mant, and D. E. Lehr "Scintillating fiber imaging detector for 14-MeV neutrons", Proc. SPIE 2281, Scintillating Fiber Technology and Applications II, (7 September 1994); https://doi.org/10.1117/12.185813

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KEYWORDS

Sensors

Scintillators

Fiber optics

Optical fibers

CCD cameras

Image intensifiers

Image processing

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