Testing a new NIF neutron time-of-flight detector with a bibenzyl scintillator on OMEGA

Glebov, V. Yu.; Forrest, C.; Knauer, J. P.; Pruyne, A.; Romanofsky, M. H.; Sangster, T. C.; Shoup, M. J.; Stoeckl, C.; Caggiano, J. A.; Carman, M. Leslie; Clancy, T. J.; Hatarik, R.; McNaney, J. M.; Zaitseva, Natalia

doi:10.1063/1.4731001

Cited by 31 publications

(8 citation statements)

References 8 publications

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“…However, trans-stilbene cannot be applied at higher temperature conditions due to a lower melting point (124 • C). Researchers have been working on low-cost crystal growth methods and stilbene alternatives [5][6][7]. Research results from the Lawrence Livermore National Laboratory of America show that 9, 10-diphenylanthracene (DPA) has a higher light yield than stilbene for heavy particles [8,9].…”

Section: Introductionmentioning

confidence: 99%

Structure, Optical, and Thermal Properties of 9, 10-Diphenylanthracene Crystals

Zhu

et al. 2019

Crystals

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9,10-diphenylanthracene (DPA) single crystal is a promising scintillator material for fast-neutron detection. Two centimetre-sized polymorph crystals of DPA were grown by melting and solution methods (DPA-Melt and DPA-Solution, respectively), and characterised by single-crystal X-ray diffraction, Raman spectroscopy, Fourier-transform infrared spectroscopy, fluorescence spectroscopy, UV-Vis absorbance spectroscopy, and thermogravimetric/differential scanning calorimetry. The DPA-Melt crystal possessed a P21/n structure, with excitation bands at approximately 331, 348, 367, and 387 nm, and the strongest emission wavelength at approximately 454 nm. On the other hand, the DPA-Solution crystal possessed a C2/c structure, with excitation bands at approximately 335, 353, 372, and 396 nm, and the strongest emission wavelength at approximately 468 nm. The two kinds of DPA crystals have the same molecular formula but different crystal structures, crystal lattice constants, and cell parameters. The theoretical density of the DPA-Solution crystal was 1.239 g/cm3, while that of the DPA-Melt crystal was 1.211 g/cm3. The two types of crystals exhibited the same melting point, but the thermal stability of the DPA-Solution crystal is better than that of the DPA-Melt crystal.

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Section: Introductionmentioning

confidence: 99%

Structure, Optical, and Thermal Properties of 9, 10-Diphenylanthracene Crystals

Zhu

et al. 2019

Crystals

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“…At the National Ignition Facility (NIF), we field an array of nTOF (neutron time of flight) spectrometers [2][3][4][5] and one MRS (magnetic recoil spectrometer) [6,7], sampling the neutron spectrum along very different lines of sight. The pre cision of these NIF neutron spectrometers is better than the approximations Brysk [1] makes in his 1972 paper.…”

Section: Introductionmentioning

confidence: 99%

Interpreting inertial fusion neutron spectra

Munro¹

2016

Nucl. Fusion

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A burning laser fusion plasma produces a neutron spectrum first described by Brysk (1973 Plasma Phys. Control. Fusion 15 611). This and more recent work deals with the spectrum produced by a single fluid element. The distribution of temperatures and velocities in multiple fluid elements combine in any real spectrum; we derive formulas for how the neutron spectrum averages these contributions. The single element momentum spectrum is accurately Gaussian, but the multi-element spectrum exhibits higher moments. In particular, the skew and kurtosis are likely to be large enough to measure. Even the single fluid element spectrum may exhibit measurable directional anisotropy, so that instruments with different lines of sight should see different yields, mean velocities, mean temperatures, and higher moments. Finally, we briefly discuss how scattering in the imploded core modifies the neutron spectrum by changing the relative weighting of fuel regions with different temperatures and velocities.

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“…The HENTOF spectrometer consists of a large organic scintillator (e.g. bibenzyl which is used in the current 20 m NTOF spectrometers [194]) positioned 20 m downstream of the LENS. A 'cleanup' collimator reduces the background radiations produced by interactions in the LENS detector system.…”

Section: Future Facility Development and Proposed Nuclear Researchmentioning

confidence: 99%

Dynamic high energy density plasma environments at the National Ignition Facility for nuclear science research

Cerjan

Bernstein

Hopkins

et al. 2018

J. Phys. G: Nucl. Part. Phys.

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The generation of dynamic high energy density plasmas in the pico-to nanosecond time domain at high-energy laser facilities affords unprecedented nuclear science research possibilities. At the National Ignition Facility (NIF), the primary goal of inertial confinement fusion research has led to the synergistic development of a unique high brightness neutron source, sophisticated nuclear diagnostic instrumentation, and versatile experimental platforms. These novel experimental capabilities provide a new path to investigate nuclear processes and structural effects in the time, mass and energy density domains relevant to astrophysical phenomena in a unique terrestrial environment. Some immediate applications include neutron capture cross-section evaluation, fission fragment production, and ion energy loss measurement in

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Testing a new NIF neutron time-of-flight detector with a bibenzyl scintillator on OMEGA

Cited by 31 publications

References 8 publications

Structure, Optical, and Thermal Properties of 9, 10-Diphenylanthracene Crystals

Structure, Optical, and Thermal Properties of 9, 10-Diphenylanthracene Crystals

Interpreting inertial fusion neutron spectra

Dynamic high energy density plasma environments at the National Ignition Facility for nuclear science research

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