Error analysis for fast scintillator-based ICF burn history measurements Page: 4 of 12
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Lerche, Page 2
A fast 25-ps resolution neutron detector has been
developed for ICF burn history measurements.' It is based on
the fast rise time of a conventional plastic scintillator.
Neutron kinetic energy is transferred to the scintillator
primarily by elastic collisions with hydrogen atoms. The
resulting recoil protons quickly slow down via coulomb
collisions, transferring their energy to electrons which excite
light-emitting luminescent states in the scintillator. In
BC-422 scintillator material, the light output distribution f o r
a neutron collision exhibits a fast (< 20 ps) rise time and a
characteristic 1.2-ns decay constant.
The temporal distribution for light produced when a burst
of neutrons excite the scintillator is the convolution of the
neutron temporal distribution with the characteristic
scintillator response. If the duration of the neutron burst i s
much shorter than the decay rate of the scintillator, then
information about the neutron temporal distribution i s
contained entirely in the leading edge of the output pulse. The
temporal distribution of neutrons exciting the scintillator can
be recovered from a measured signal by deconvolving the
effect of the scintillator response. For short excitation times,
this is approximately the derivative of the recorded signal.
A measurement such as this, where the recorded signal
represents the integral of the desired quantity, can have
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Lerche, R A & Ognibene, T J. Error analysis for fast scintillator-based ICF burn history measurements, article, July 6, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc686164/m1/4/: accessed February 22, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.