Diagnostic technique for measuring fusion reaction rate for inertial confinement fusion experiments at Shen Guang-III prototype laser facility

Wang, Feng; Peng, Xiaoshi; Kang, Dongguo; Liu, Shenye; Xu, Tao

doi:10.1088/1674-1056/22/11/115204

Cited by 9 publications

(6 citation statements)

References 10 publications

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“…The neutron bang time was measured by the neutron fusion reaction rate diagnostic system. [37] The available results were only obtained at the last four shots. After neutron signal extraction and time-based correction, information of the neutron bang time is encoded in the leading edge of the pulse, as shown in Fig.…”

Section: Experiments Resultsmentioning

confidence: 99%

“…[36] The nTOF detector, composed of a plastic scintillator and fast photomultiplier tubes, was placed at 10-13 m from TCC. The neutron fu-sion reaction rate diagnostic system [37] based on the fast plastic scintillator and optical streak camera measured the neutron bang time and fusion reaction rate history. The 2 mm-thin fast plastic scintillator (EJ232) was placed at a 3 cm distance from TCC and acted as a neutron-to-light converter.…”

Section: Initial Experiments Designmentioning

confidence: 99%

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First polar direct-drive exploding-pusher target experiments on the ShenGuang laser facility*

Yang

Huang

et al. 2019

Chinese Phys. B

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Low density and low convergence implosion occurs in the exploding-pusher target experiment, and generates neutrons isotropically to develop a high yield platform. In order to validate the performance of ShenGuang (SG) laser facility and test nuclear diagnostics, all 48-beam lasers with an on-target energy of 48 kJ were firstly used to drive room-temperature, DT gas-filled glass targets. The optimization has been carried out and optimal drive uniformity was obtained by the combination of beam repointing and target. The final irradiation uniformity of less than 5% on polar direct-drive capsules of 540 μ m in diameter was achieved, and the highest thermonuclear yield of the polar direct-drive DT fuel implosion at the SG was 1.04×1013. The experiment results show neutron yields severely depend on the irradiation uniformity and laser timing, and decrease with the increase of the diameter and fuel pressure of the target. The thin CH ablator does not impact the implosion performance, but the laser drive uniformity is important. The simulated results validate that the cos γ distribution laser design is reasonable and can achieve a symmetric pressure distribution. Further optimization will focus on measuring the symmetry of the hot spot by self-emission imaging, increasing the diameter, and decreasing the fuel pressure.

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Section: Experiments Resultsmentioning

confidence: 99%

Section: Initial Experiments Designmentioning

confidence: 99%

First polar direct-drive exploding-pusher target experiments on the ShenGuang laser facility*

Yang

Huang

et al. 2019

Chinese Phys. B

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“…No radiation harden design was needed so far which should be regarded as the advantage of pure D fuel. The Nuclear Temporal Detector (NTD) [24] was not used in the cryogenic D-layered implosion experiments, since the standoff distance of the NTD was increased for not interfering with the thermal shroud. The increasement of standoff distance reduced the neutron counts, and the signal-to-noise ratio.…”

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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“…The implosion bang time was measured by the neutron fusion reaction rate diagnostic system [27] on the 100 kJ laser facility, and less than 700 ps. [22] The measurement error was more than 200 ps in 2015 and decreases to 50 ps after 2018.…”

Section: Comparing With Experimentsmentioning

confidence: 99%

A simple analytical model of laser direct-drive thin shell target implosion

Yu¹,

Huang²,

Li³

et al. 2022

Chinese Phys. B

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A high-neutron yield platform imploded by a thin shell target is generally built to probe nuclear science problems, and it has the advantages of high neutron yield, ultrashort fusion time, micro fusion zone, isotropic and monoenergetic neutron. Some analytical models have been proposed to interpret exploding-pusher target implosion driven by a long wavelength laser, whereas they are imperfect for a 0.35 μm laser implosion experiment. When using the 0.35 μm laser, the shell is ablated and accelerated to high implosion velocity governed by Newton’s law, ablation acceleration and quasi-adiabatic compression models are suitable to explain the implosion of a laser direct-drive thin shell target. The new analytical model scales bang time, ion temperature and neutron yield for large variations in laser power, target radius, shell thickness, and fuel pressure. The predicted results of the analytical model are in agreement with experimental data on the Shenguang-III prototype laser facility, 100 kJ laser facility, Omega, and NIF, it demonstrates that the analytical model benefits the understanding of experiment performance and optimizing the target design of high neutron yield implosion.

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Diagnostic technique for measuring fusion reaction rate for inertial confinement fusion experiments at Shen Guang-III prototype laser facility

Cited by 9 publications

References 10 publications

First polar direct-drive exploding-pusher target experiments on the ShenGuang laser facility*

First polar direct-drive exploding-pusher target experiments on the ShenGuang laser facility*

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

A simple analytical model of laser direct-drive thin shell target implosion

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