Implementation of an enhanced, permanently installed neutron activation diagnostic hardware for NIF

Jedlovec, D.; Edwards, Ellen R.; Carrera, J.; Yeamans, C. B.

doi:10.1117/12.2190153

Cited by 5 publications

(3 citation statements)

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“…Studies on warm, gas-filled exploding pusher target implosions reported significant anisotropy attributed to target alignment [57], target mounting [58], capsule defects [59], and non-uniform illumination [60]. For example, the effect of dropping two of the 48 NIF laser quads leads to substantial asymmetry in density and implosion velocity without precise redistribution of the remaining laser energy.…”

Section: Neutron Activation Diagnostics (Nad)mentioning

confidence: 99%

“…An FNADs system based on a lanthanum bromide scintillators and compact gamma spectrometers installed in the target bay is being developed to provide immediate postshot readout of yield [58]. This system will have additional capability to measure multiple DT neutron reactions and other neutron source terms, such as TT and DD fusion reaction neutrons [59,60].…”

Section: Neutron Activation Diagnostics (Nad)mentioning

confidence: 99%

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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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Section: Neutron Activation Diagnostics (Nad)mentioning

confidence: 99%

Section: Neutron Activation Diagnostics (Nad)mentioning

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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show abstract

“…Additionally, spatially-distributed flange-mounted NADs (FNADs) measure, with nearly identical systematic uncertainties, primary DT neutron emission to infer a whole-sky neutron field [20]. Real-time NADs, based on a lanthanum bromide scintillator and compact gamma spectrometer installed in the target bay, are being developed to provide immediate postshot readout of yield in a modular and expandable integrated system design [21]. This system will have additional physics capability to measure multiple DT neutron reactions [22] and other neutron source terms [23].…”

Section: Neutron Activation Diagnostics (Nads)mentioning

confidence: 99%

Nuclear Diagnostics at the National Ignition Facility, 2013-2015

Yeamans

Cassata

Church

et al. 2016

J. Phys.: Conf. Ser.

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Real-time nuclear activation detectors for measuring neutron angular distributions at the National Ignition Facility (invited)

Bionta

Grim

Hahn

et al. 2021

Review of Scientific Instruments

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The Real Time Nuclear Activation Detector (RTNAD) array at NIF measures the distribution of 14 MeV neutrons emitted by deuterium-tritium (DT) fueled inertial confinement fusion implosions. The uniformity of the neutron distribution is an important indication of implosion symmetry and DT shell integrity. The array consists of 48 LaBr3(Ce) crystal gamma-ray spectrometers mounted outside the NIF target chamber, which continuously monitor the slow decay of the 909 keV gamma-ray line from activated 89Zr located in Zr cups surrounding each crystal. The measured decay rate dramatically increases during a DT implosion in proportion to the number of 14 MeV neutrons striking each Zr cup. The neutrons produce activated 89Zr through an (n, 2n) reaction on 90Zr, which is insensitive to low energy neutrons. The neutron flux along the detector line-of-sight at shot time is determined by extrapolating the fitted 909 keV decay curve back to shot time. Automatic analysis algorithms were developed to handle the non-stop data stream. The large number of detectors and the high statistical accuracy of the array enable the spherical harmonic modes of the neutron angular distribution to be measured up to L ≤ 4 to provide a better understanding of implosion dynamics. In addition, these data combined with measurements of the down-scattered neutrons can be used to derive fuel areal density distributions. This paper will describe the RTNAD hardware and analysis procedures.

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Implementation of an enhanced, permanently installed neutron activation diagnostic hardware for NIF

Cited by 5 publications

References 1 publication

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

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

Nuclear Diagnostics at the National Ignition Facility, 2013-2015

Real-time nuclear activation detectors for measuring neutron angular distributions at the National Ignition Facility (invited)

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