A method for <i>in situ</i> absolute DD yield calibration of neutron time-of-flight detectors on OMEGA using CR-39-based proton detectors

Waugh, C.; Rosenberg, M. J.; Zylstra, A. B.; Frenje, J. A.; Séguin, F. H.; Petrasso, R. D.; Glebov, V. Yu.; Sangster, T. C.; Stoeckl, C.

doi:10.1063/1.4919290

Cited by 12 publications

(5 citation statements)

References 41 publications

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“…One of these experiments dealing with deuterium cluster targets irradiated with 100 fs pulses, see Ma04 label, gave the dependence FIGURE 2 | Selected DD-fusion experiments associated with laser energy dependence of fusion neutron yields obeying the power law Q•E 1.65 , where Q SGG = 14 (short dash line), and Q BL = 2,000 (solid line), Q fs = 7.1 × 10 4 (dash-dot line) for explosions of deuterium clusters [2], Q fs = 4.1 × 10 5 (dash line) and Q fs = 7.5 × 10 6 (dot line). Data from References: Ma04 [2], Sy06 [10], Vo00 [13], Pr98 [17], Be06 [18], Iz02 [19], Fr02 [28], Zu13 [33], Di99 [34], V1 [25], V2 [26], V3 [27], PALS [20], Ω14 [22], Iskra5 [21], NIF-DD [23], Ω05 [31], Ω96 [14], SGII-Up [12], GXII [29], GXII95 [32], and SGIII15 [30]. [1,2].…”

Section: Regardless Of Inaccuracies In Total Neutron Yield Determinationmentioning

confidence: 99%

“…The values of the absolute yields of DD neutrons tagged with Ω label were taken from two experimental campaigns at OMEGA. As targets where used the glass capsules 880 µm in diameter, 2.0 µm thick, and filled with 3.6 atm D 2 and 7.9 atm D 3 He gas, and with 9.3 atm of D 2 gas which were irradiated with 60 laser beams providing ≈2.5 and ≈5.2 kJ, respectively [22].…”

Section: Regardless Of Inaccuracies In Total Neutron Yield Determinationmentioning

confidence: 99%

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Scaling of Laser Fusion Experiments for DD-Neutron Yield

Krása

Klír

2020

Front. Phys.

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Yields of neutrons produced in various laser fusion experiments conducted in recent decades are compared with each other. It has surprisingly been found that there is a possibility to make an overall elucidation of the variance in the number of neutrons produced in the various experiments. The common method is based on definition of the energy conversion efficiency as a ratio between the energy carried out by neutrons produced through the fusion reaction and the input energy given by laser energy, E, focused on a target. The neutron-yield-laser-energy (Y-E) diagram is the basic chart used to interpret the spread of experimental data in terms of the experimental efficiency of the laser-matter interaction. Experiments carried out using a single laser system show that laser energy dependence of the yield can be well-characterized by a power law, Y = QE α , where Q is the parameter reflecting possible dependence on the pulse duration, laser intensity, laser contrast ratio, focal geometry, target structure, etc. [1, 2]. Sorting the values of the neutron yields obtained in various experiments shows that the power law Y = Q E 1.65 is suitable to determine lines in the Y-E diagram each of them, where the value of Q is associated with quality of experimental conditions [3]. This sorting shows the order-of-magnitude differences in yields found in various experiments, which can be characterized by the value of the parameter Q. Due to the easy feasibility and the large number of DD fusion experiments performed, the overall Y-E diagram gives a chance to identify suitable laser systems for effective DD fusion experiments. It can, therefore, be assumed that some of the conclusions of these experiments could also be applied to the experimental arrangement suitable for optimizing p 11 B fusion.

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Section: Regardless Of Inaccuracies In Total Neutron Yield Determinationmentioning

confidence: 99%

Section: Regardless Of Inaccuracies In Total Neutron Yield Determinationmentioning

confidence: 99%

Scaling of Laser Fusion Experiments for DD-Neutron Yield

Krása

Klír

2020

Front. Phys.

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“…The standard deviation of all measurements is ~12%, which is a bit high for an implosion with bangtime after the end of the laser pulse. 30 Using all 12 samples, the total D 3 He-p yield from the implosion is constrained to 2.710 8 8.5%. 62 This total uncertainty is higher than observed on a similar, smaller scale implosion on OMEGA (FIG.…”

Section: Fig 11mentioning

confidence: 99%

Development of an inertial confinement fusion platform to study charged-particle-producing nuclear reactions relevant to nuclear astrophysics

et al. 2017

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This paper describes the development of a platform to study astrophysically relevant nuclear reactions using inertial-confinement fusion implosions on the OMEGA and National Ignition Facility laser facilities, with a particular focus on optimizing the implosions to study charged-particle-producing reactions. Primary requirements on the platform are high yield, for high statistics in the fusion product measurements, combined with low areal density, to allow the charged fusion products to escape. This is optimally achieved with direct-drive exploding pusher implosions using thin-glass-shell capsules. Mitigation strategies to eliminate a possible target sheath potential which would accelerate the emitted ions are discussed. The potential impact of kinetic effects on the implosions is also considered. The platform is initially employed to study the complementary T(t,2n)α, T(3He,np)α and 3He(3He,2p)α reactions. Proof-of-principle results from the first experiments demonstrating the ability to accurately measure the energy and yields of charged particles are presented. Lessons learned from these experiments will be used in studies of other reactions. The goals are to explore thermonuclear reaction rates and fundamental nuclear physics in stellar-like plasma environments, and to push this new frontier of nuclear astrophysics into unique regimes not reachable through existing platforms, with thermal ion velocity distributions, plasma screening, and low reactant energies.

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“…The implosion is that the high-intensity laser directly interacts with a thin shell, such as a plastic or glass wall, to generate a strong shock wave, heat and compress the fuel, and produce thermonuclear neutrons when the strong shocks collide at the target center. Such a platform has the advantages of high neutron yield, ultrashort fusion time, micro fusion zone, isotropic and monoenergetic neutron, and is usually used to develop the nuclear diagnostic system, [1,2] study the neutron irradiation effect, [3] measure the nuclear reaction [4,5] and cross section, [6] probe the fluid kinetic effects, [7][8][9][10] et al The glass target implosion is the simplest and earliest experiment on the laser facility, and demonstrates that thermonuclear neutrons resulting from laser-induced microshell implosion at KMS. [11] In order to understand the functional relationships between the various parameters of experiments and increase experiential neutron yield, some analytical models for long wavelength laser, such as 1.05 µm, have been proposed.…”

Section: Introductionmentioning

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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A method for in situ absolute DD yield calibration of neutron time-of-flight detectors on OMEGA using CR-39-based proton detectors

Cited by 12 publications

References 41 publications

Scaling of Laser Fusion Experiments for DD-Neutron Yield

Scaling of Laser Fusion Experiments for DD-Neutron Yield

Development of an inertial confinement fusion platform to study charged-particle-producing nuclear reactions relevant to nuclear astrophysics

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

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