Note: Neutron bang time diagnostic system on Shenguang-III prototype

Tang, Qi; Chen, Jiabin; Liu, Zhongjie; Zhan, Xun; Zha, Song

doi:10.1063/1.4870902

Cited by 4 publications

(5 citation statements)

References 9 publications

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“…A fiducial pulse train produced by the laser fiducial system is recorded simultaneously for an absolute timing measurement. The cross timing of this system and NBT has been performed at the SG-III prototype laser facility [35]. Good agreement was obtained, as shown in figure 16.…”

Section: Stagnation and Fusionmentioning

confidence: 72%

“…The implosion symmetry can be inferred from the size and shape of hotspot and cold fuel. Fusion products bring abundant information about the hotspot and fusion process [30][31][32][33][34][35][36][37][38]. X-ray and neutron imaging are used to diagnose the size and shape of the hotspot.…”

Section: Stagnation and Fusionmentioning

confidence: 99%

“…It sensitively depends on the physical processes from the laser injection to the stagnation phase and fusion. A neutron bangtime diagnostic system based on a quenched plastic scintillator and microchannel-plate photomultiplier tube (MCP-PMT) has been installed and successfully used to measure neutron bangtime at the SG-III laser facility [35]. The construction of an x-ray bangtime diagnostic system has just been accomplished.…”

Section: Stagnation and Fusionmentioning

confidence: 99%

“…A neutron bangtime (NBT) diagnostic system [35] has been implemented at the SG-III laser facility and tested at the SG-III prototype laser facility. The system (shown in figure 14) was based on a sensitive neutron detector, which consists of a plastic scintillator and a MCP-PMT.…”

Section: Stagnation and Fusionmentioning

confidence: 99%

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Experimental progress of inertial confinement fusion based at the ShenGuang-III laser facility in China

et al. 2018

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The ShenGuang-III (SG-III) laser facility was developed by the laser fusion research center (LFRC) for inertial confinement fusion (ICF) studies in China. Over 80 diagnostics have been installed at the SG-III laser facility, including optical diagnostics, x-ray imaging diagnostics, x-ray spectrum diagnostics, fusion product diagnostics and general diagnostics assistant systems, as well as central control and data acquisition systems. Various ICF experiments have also been performed at the SG-III laser facility. The first experiment explored the laser-target coupling process, including investigations of hohlraum radiation flux and laser energy coupling efficiency. The second experiment explored ablation and implosion physics, including shell asymmetry and implosion trajectory. The third experiment explored stagnation, hotspot dynamics and the nuclear phase of the implosion.

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Section: Stagnation and Fusionmentioning

confidence: 72%

Section: Stagnation and Fusionmentioning

confidence: 99%

Section: Stagnation and Fusionmentioning

confidence: 99%

Section: Stagnation and Fusionmentioning

confidence: 99%

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Experimental progress of inertial confinement fusion based at the ShenGuang-III laser facility in China

et al. 2018

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“…This problem is more serious for pure D fuel. Alternatively, we measured the neutron bangtime with a scintillator-PMT based system [25]. The areal fuel density was characterized by the energy spectrum of secondary protons, which was measured by a wedged range filter [26].…”

Section: Methodsmentioning

confidence: 99%

Demonstration of indirectly driven implosion experiments with cryogenic pure deuterium layered capsules on the Shenguang Laser Facility

Wang

et al. 2023

Nucl. Fusion

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To achieve ignition in a laboratory via inertial confinement fusion, a spherical capsule containing a frozen layer of deuterium and tritium (DT) fuel will be imploded on an MJ-class laser facility. However, if pure deuterium fuel can be used in place of DT fuel for tuning shots, we may speed up the process of ignition experiments while maintaining the surrogacy by significantly reducing the level of radioactivity. Unfortunately, it has long been assumed that neither the approach of symmetrical infrared irradiation used in the Omega direct-drive experiments nor the method of beta-layering used in the NIF experiments can be used to smooth the D layered capsule in cylindrical hohlraums. The difficulty in smoothing the D ice layer prevents us from taking advantage of cryogenic D-layered capsules in indirect-drive experiments. In this work, we established a procedure to form a uniform D-ice layer for capsules held in cylindrical hohlraums and carried out indirect-drive cryogenic D-layered implosion experiments using a squared laser pulse on the Shenguang laser facility in China. The quality of the D ice layer is characterized by phase-contrast imaging. The root-mean-square of the power spectrum in modes 2-100 is about 2.2μm. The implosion performance of the D-layered capsules is close to the prediction of one-dimensional simulations. The measured neutron yield and areal fuel density are 1.2×1011 and 80mg/cm2, respectively.

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Neutron temporal diagnostic for high-yield deuterium–tritium cryogenic implosions on OMEGA

Stoeckl

Boni

Ehrne

et al. 2016

Review of Scientific Instruments

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A next-generation neutron temporal diagnostic (NTD) capable of recording high-quality data for the highest anticipated yield cryogenic deuterium-tritium (DT) implosion experiments was recently installed at the Omega Laser Facility. A high-quality measurement of the neutron production width is required to determine the hot-spot pressure achieved in inertial confinement fusion experiments-a key metric in assessing the quality of these implosions. The design of this NTD is based on a fast-rise-time plastic scintillator, which converts the neutron kinetic energy to 350- to 450-nm-wavelength light. The light from the scintillator inside the nose-cone assembly is relayed ∼16 m to a streak camera in a well-shielded location. An ∼200× reduction in neutron background was observed during the first high-yield DT cryogenic implosions compared to the current NTD installation on OMEGA. An impulse response of ∼40 ± 10 ps was measured in a dedicated experiment using hard x-rays from a planar target irradiated with a 10-ps short pulse from the OMEGA EP laser. The measured instrument response includes contributions from the scintillator rise time, optical relay, and streak camera.

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Note: Neutron bang time diagnostic system on Shenguang-III prototype

Cited by 4 publications

References 9 publications

Experimental progress of inertial confinement fusion based at the ShenGuang-III laser facility in China

Experimental progress of inertial confinement fusion based at the ShenGuang-III laser facility in China

Demonstration of indirectly driven implosion experiments with cryogenic pure deuterium layered capsules on the Shenguang Laser Facility

Neutron temporal diagnostic for high-yield deuterium–tritium cryogenic implosions on OMEGA

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