ICF gamma-ray reaction history diagnostics

Herrmann, H. W.; Young, C. S.; Mack, J. M.; Kim, Y H; McEvoy, A. M.; Evans, S.; Sedillo, T. J.; Batha, S. H.; Schmitt, Mark J.; Wilson, D. C.; Langenbrunner, J. R.; Malone, Robert M.; Kaufman, Morris I.; Cox, Brian C.; Frogget, Brent C.; Miller, E. K.; Ali, Zaheer; Tunnell, Thomas W.; Stoeffl, W.; Horsfield, C. J.; Rubery, M. S.

doi:10.1088/1742-6596/244/3/032047

Cited by 38 publications

(12 citation statements)

References 3 publications

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“…The Gas Cherenkov Detector (GCD) [17][18][19] and Gamma Reaction History (GRH) [20,21] diagnostics were designed for this purpose. GCD converts γ-rays to Compton electrons as they interact with a 1.5-cm-thick, 7-cm-diameter beryllium disk.…”

mentioning

confidence: 99%

Determination of the deuterium-tritium branching ratio based on inertial confinement fusion implosions

Kim¹,

Mack²,

Herrmann³

et al. 2012

Phys. Rev. C

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The D-T gamma-to-neutron branching ratio (3 H(d,γ) 5 He/ 3 H(d,n) 4 He) has been determined at inertial confinement fusion (ICF) conditions, where the center-of-mass energy of 14-24 keV is lower than in previous accelerator-based experiments. A D-T branching ratio value of (4.2 ± 2.0)×10-5 was determined by averaging the results of two methods: 1) a direct measurement of ICF D-T γ-ray and neutron emissions using absolutely-calibrated detectors, and 2) a separate cross-calibration against the D-3 He gamma-to-proton branching ratio (3 He(d,γ) 5 Li/ 3 He(d,p) 4 He). Neutron-induced backgrounds are significantly reduced as compared to traditional beam-target accelerator-based experiments due to the short pulse nature of ICF implosions and the use of gas Cherenkov γ-ray detectors with fast temporal responses and inherent energy thresholds. These measurements of the D-T branching ratio in an ICF environment test several theoretical assumptions about the nature of A = 5 systems, including the dominance of the 3/2 + resonance at low energies, the presence of the broad first excited state of 5 He in the spectra, and the charge-symmetric nature of the capture processes in the mirror systems 5 He and 5 Li.

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mentioning

confidence: 99%

Determination of the deuterium-tritium branching ratio based on inertial confinement fusion implosions

Kim¹,

Mack²,

Herrmann³

et al. 2012

Phys. Rev. C

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“…Of special interest in the work described here is the use of the time-integrated 4.4 MeV 12 C γ emission to fit the hydrocarbon areal density in the context of this model and thereby derive a better qualitative understanding of the stagnation conditions. Constraints for the ablator areal density arise from estimates of the remaining hydrocarbon ablator mass [165,166] and the ablator mass mixed into the burning core [167]. In the case of the highyield series of implosions [164], very little ablator mix was observed in the burning core, implying that the remaining ablator material is either located in a compressed shell around the DT fuel assembly or entrained in the fuel assembly, or both.…”

Section: Grh Diagnostic For Determination Of Ablator Areal Density Inmentioning

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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“…However, capsules loaded with pure deuterium would not suffer from this background since the γ-decay branch from the D+D reaction is nearly two orders of magnitude smaller due to isospin conservation. The detector currently fielded at NIF that is best suited to the task of observing capture γ-rays is the Gamma Reaction History (GRH) diagnostic [6]. GRH consists of four gas Cerenkov detectors with independently tuned energy thresholds that can be adjusted between 2.8 and 14+ MeV with a maximum threshold of 10 MeV being most common.…”

Section: Prompt Gamma-ray Approachmentioning

confidence: 99%