Calibration of a neutron time-of-flight detector with a rapid instrument response function for measurements of bulk fluid motion on OMEGA
A newly developed neutron time-of-flight (nTOF) diagnostic with a fast instrument response function has been fielded on the OMEGA laser in a highly collimated line of sight. By using a small plastic scintillator volume, the detector provides a narrow instrument response of 1.7 ns full width at half...
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Veröffentlicht in: | Review of scientific instruments 2018-10, Vol.89 (10), p.10I131-10I131 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A newly developed neutron time-of-flight (nTOF) diagnostic with a fast instrument
response function has been fielded on the OMEGA laser in a highly collimated line of
sight. By using a small plastic scintillator volume, the detector provides a narrow
instrument response of 1.7 ns full width at half maximum while maintaining a large
signal-to-noise ratio for neutron yields between 1010 and 1014. The
OMEGA hardware timing system is used along with an optical fiducial to provide an absolute
nTOF measurement to an accuracy of ∼56 ps. The fast instrument response enables the
accurate measurement of the primary deuterium-tritium neutron peak shape, while the
optical fiducial allows for an absolute neutron energy measurement. The new detector
measures the neutron mean energy with an uncertainty of ∼7 keV, corresponding to a
hot-spot velocity projection uncertainty of ∼12 km/s. Evidence of bulk fluid motion in
cryogenic targets is presented with measurements of the neutron energy spectrum. |
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ISSN: | 0034-6748 1089-7623 |
DOI: | 10.1063/1.5037324 |