Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility

Parker, Cody; Frenje, J. A.; Johnson, M. Gatu; Schlossberg, D. J.; Reynolds, H.; Hopkins, L. Berzak; Bionta, R. M.; Casey, D. T.; Felker, S.; Hilsabeck, T.; Kilkenny, J. D.; Li, C K; Mackinnon, Andrew; Robey, H. F.; Schoff, M. E.; Séguin, F. H.; Wink, C. W.; Petrasso, R. D.

doi:10.1063/1.5052184

Cited by 6 publications

(1 citation statement)

References 20 publications

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“…The system is called MRSt that is based on the existing MRS principle and PDDT technology [236,237]. Current point-design includes a 40 μm thick, 400 μm diameter CD foil positioned on the outside of a hohlraum for production of recoil deuterons from incident neutrons [238]; two dipoles and three quadrupoles, positioned outside the NIF target chamber for energy analysis and focusing of forward-scattered recoil deuterons onto a short focal plane of the spectrometer; and a PDDT with a CsI photocathode positioned at the focal plane. In the CsI photocathode, the recoil deuterons generate secondary electrons, which are subsequently accelerated by a spatially-and time-varying electric field that unskews and stretches the signal over a distance of ∼1 m. This signal is subsequently amplified by an MCPs and detected by an array of anodes.…”

Section: Next-generation Nuclear Diagnosticsmentioning

confidence: 99%

Nuclear diagnostics for Inertial Confinement Fusion (ICF) plasmas

Frenje

2020

Plasma Phys. Control. Fusion

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The field of nuclear diagnostics for Inertial Confinement Fusion (ICF) is broadly reviewed from its beginning in the seventies to present day. During this time, the sophistication of the ICF facilities and the suite of nuclear diagnostics have substantially evolved, generally a consequence of the efforts and experience gained on previous facilities. As the fusion yields have increased several orders of magnitude during these years, the quality of the nuclear-fusion-product measurements has improved significantly, facilitating an increased level of understanding about the physics governing the nuclear phase of an ICF implosion. The field of ICF has now entered an era where the fusion yields are high enough for nuclear measurements to provide spatial, temporal and spectral information, which have proven indispensable to understanding the performance of an ICF implosion. At the same time, the requirements on the nuclear diagnostics have also become more stringent. To put these measurements into context, this review starts by providing some historical remarks about the field of ICF and the role of nuclear diagnostics, followed by a brief overview of the basic physics that characterize the nuclear phase and performance of an ICF implosion. A technical discussion is subsequently presented of the neutron, gamma-ray, charged-particle and radiochemistry diagnostics that are, or have been, routinely used in the field of ICF. This discussion is followed by an elaboration of the current view of the next-generation nuclear diagnostics. Since the seventies, the overall progress made in the areas of nuclear diagnostics and scientific understanding of an ICF implosion has been enormous, and with the implementation of new high-fusion-yield facilities world-wide, the nextgeneration nuclear diagnostics will play an even more important role for decades to come.

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Section: Next-generation Nuclear Diagnosticsmentioning

confidence: 99%

Nuclear diagnostics for Inertial Confinement Fusion (ICF) plasmas

Frenje

2020

Plasma Phys. Control. Fusion

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Response of a lead-free borosilicate-glass microchannel plate to 14-MeV neutrons and γ-rays

Parker

Frenje

Siegmund

et al. 2019

Review of Scientific Instruments

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In microchannel plate applications, such as in space telescopes, night-vision devices, or time-of-flight particle detection, reducing the sensitivity to signals from background sources, such as γ-rays, is beneficial for the system design and performance. The response of a single-stage lead-free borosilicate-glass microchannel plate to 14-MeV neutrons and γ-rays produced via (n, γ) reactions in surrounding structures was investigated at OMEGA. The average efficiency values for secondary electron production were found to be (5.1 ± 0.7) × 10−3 for 14-MeV neutrons and (4.9 ± 1.1) × 10−3 for ⟨1.5⟩-MeV γ-rays.

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Using millimeter-sized carbon–deuterium foils for high-precision deuterium–tritium neutron spectrum measurements in direct-drive inertial confinement fusion at the OMEGA laser facility

Johnson

Aguirre

Armstrong

et al. 2021

Review of Scientific Instruments

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Millimeter-sized CD foils fielded close (order mm) to inertial confinement fusion (ICF) implosions have been proposed as a game-changer for improving energy resolution and allowing time-resolution in neutron spectrum measurements using the magnetic recoil technique. This paper presents results from initial experiments testing this concept for direct drive ICF at the OMEGA Laser Facility. While the foils are shown to produce reasonable signals, inferred spectral broadening is seen to be high (∼5 keV) and signal levels are low (by ∼20%) compared to expectation. Before this type of foil is used for precision experiments, the foil mount must be improved, oxygen uptake in the foils must be better characterized, and impact of uncontrolled foil motion prior to detection must be investigated.

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Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility

Cited by 6 publications

References 20 publications

Nuclear diagnostics for Inertial Confinement Fusion (ICF) plasmas

Nuclear diagnostics for Inertial Confinement Fusion (ICF) plasmas

Response of a lead-free borosilicate-glass microchannel plate to 14-MeV neutrons and γ-rays

Using millimeter-sized carbon–deuterium foils for high-precision deuterium–tritium neutron spectrum measurements in direct-drive inertial confinement fusion at the OMEGA laser facility

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