X-ray conversion efficiency and radiation non-uniformity in the hohlraum experiments at Shenguang-III prototype laser facility

Zhang, Huasen; Yang, Dong; Song, Peng; Zou, Shiyang; Zhao, Yiqing; Li, Sanwei; Li, Zhichao; Guo, Liang; Wang, Feng; Peng, Xiaoshi; Wei, Huiyue; Xu, Tao; Zheng, Wudi; Gu, Peng; Pei, Wenbing; Jiang, Shaoen; Ding, Yongkun

doi:10.1063/1.4901919

Cited by 25 publications

(11 citation statements)

References 30 publications

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“…In the simulation, the scattered light energy of Au hohlraum is set as 8% of the total laser energy. This value was obtained from previous Au hohlraum energetic experiments on SGIII-prototype [27], in which the total laser energy and T r are similar to those of our comparative experiment. As the scattered laser energy of UN-coated DUH has not been measured yet, we assume it to be 8%, considering the same laser and similar plasma conditions as Au hohlraum.…”

Section: Results and Analysissupporting

confidence: 85%

Uranium hohlraum with an ultrathin uranium–nitride coating layer for low hard x-ray emission and high radiation temperature

et al. 2015

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An ultrathin layer of uranium nitrides (UN) has been coated on the inner surface of depleted uranium hohlraum (DUH), which has been proven by our experiment to prevent the oxidization of uranium (U) effectively. Comparative experiments between the novel depleted uranium hohlraum and pure golden (Au) hohlraum are implemented on an SGIII-prototype laser facility. Under a laser intensity of 6 × 10 14 W cm −2 , we observe that the hard x-ray (hν 1.8 > keV) fraction of the uranium hohlraum decreases by 61% and the peak intensity of the total x-ray flux (0.1 keV∼5.0 keV) increases by 5%. Radiation hydrodynamic code LARED is used to interpret the above observations. Our result for the first time indicates the advantages of the UN-coated DUH in generating a uniform x-ray source with a quasi-Planckian spectrum, which should have important applications in high energy density physics.

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Section: Results and Analysissupporting

confidence: 85%

Uranium hohlraum with an ultrathin uranium–nitride coating layer for low hard x-ray emission and high radiation temperature

et al. 2015

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“…The experimental results [48,49] indicated that the ratio of the flux from the laser spots and the wall was varying with time, and reached a peak value of about 2. The flux ratio was defined by the time-dependent wall albedo (the ratio of the re-emitted flux to the incident flux on the wall), which was taken from [37].…”

Section: Drive Symmetrymentioning

confidence: 99%

“…For comparison, the diameter of the capsule and the LEHs are fixed at 2.2 mm [9] and 2.4 mm (as stated in section 2), respectively. According to the experimental results and theor etical studies [47][48][49], the ratio of the peak flux from laser spots and the wall is taken as 2, similar to the treatment of [43]. To optimize the initial parameters of the hohlraum [50], the variations of the root-mean-square (RMS) [51] of the peak drive asymmetry as the length of the half cylinder with different cavity-to-capsule ratios (CCR = 2.0-2.5) [37], were simulated by IRAD3D, as shown in figure 2.…”

Section: Drive Symmetrymentioning

confidence: 99%

Preliminary study on a tetrahedral hohlraum with four half-cylindrical cavities for indirectly driven inertial confinement fusion

et al. 2017

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A tetrahedral hohlraum with four half-cylindrical cavities (FHCH) is proposed to balance tradeoffs among the drive symmetry, coupling efficiency, and plasma filling of the hohlraum performance for indirectly driven inertial confinement fusion. The peak drive symmetry in the FHCH with a cavity-to-capsule ratio (CCR) of 2.2 is comparable to those in the spherical hohlraum of CCR = 4.5 with six laser entrance holes (6LEHs-Sph.) ((Lan et al 2014 Phys. Plasmas 21 010704) and three-axis cylindrical hohlraum (6LEHs-Cyls.) of CCR = 2.0 (Kuang et al 2016 Sci. Rep. 6 34636) and the filling time of plasma is close to the ones in the 6LEHs-Cyls. and the ignition target Rev5-CH of the national ignition campaign, and about half of that in the 6LEHs-Sph. In particular, the coupling efficiency is about 19% and 16% higher than those of the 6LEHs-Sph. and 6LEHs-Cyls., respectively. Besides, preliminary study indicates that the FHCH has a robust symmetry to uncertainties of power imbalance and pointing errors of laser beams. Furthermore, utilizing the FHCH, the feasibility of a tetrahedral indirect drive approach on the national ignition facility and hybrid indirect-direct drive approach with the laser arrangement designed specially for 6LEHs-Sph. or 6LEHs-Cyls., is also envisioned. Therefore, the proposed hohlraum configuration merits consideration as an alternative route to indirect-drive ignition.

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“…Even though the ViewFactor experiments 10 at NIF facilitate a direct diagnosis of the X-ray drive from the capsule point of view, because of the challenge outlined earlier, realizing accurate space-resolving flux detection inside the hohlraum in these experiments is still difficult. The creation of additional diagnostic holes on the hohlraum wall has been attempted to measure the laser spot and re-emitting wall fluxes 11 . Nevertheless, the hole closure effect 10 , 12 and the change in the hohlraum structure caused by the opening of diagnostic holes could seriously affect the flux results.…”

Section: Introductionmentioning

confidence: 99%

First exploration of radiation temperatures of the laser spot, re-emitting wall and entire hohlraum drive source

Ren

Liu

Xie

et al. 2019

Sci Rep

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This study explores the radiation field temperatures introduced by the laser spot, the re-emitting wall in a hohlraum and the entire hohlraum drive source. This investigation, which is the first of its kind, is based on the radiation fluxes from the laser spot and the re-emitting wall, which have been accurately measured using time- and space-resolving flux detectors in a recent work, and additional flux data. The temperature difference between the laser spot and the entire hohlraum drive source was 6.08–35.35% of the temperature of the latter throughout the entire laser pulse, whilst that for the re-emitting wall was 3.90–12.81%. The radiation temperature of the cooler re-emitting wall had more influence on the temperature increase of the entire hohlraum drive source than the hot laser-spot temperature, which has been quantitatively discussed. Experimentally, we established the average distributions of the temperature fields of all the emitting sources, namely laser spot and re-emitting wall, of the irradiating fluxes on the capsule region in the hohlraum radiation field. This important progress in the exploration of radiation temperature distributions within a hohlraum will provide a foundation for determination of the irradiating radiation on the capsule and evaluation of capsule symmetry.

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X-ray conversion efficiency and radiation non-uniformity in the hohlraum experiments at Shenguang-III prototype laser facility

Cited by 25 publications

References 30 publications

Uranium hohlraum with an ultrathin uranium–nitride coating layer for low hard x-ray emission and high radiation temperature

Uranium hohlraum with an ultrathin uranium–nitride coating layer for low hard x-ray emission and high radiation temperature

Preliminary study on a tetrahedral hohlraum with four half-cylindrical cavities for indirectly driven inertial confinement fusion

First exploration of radiation temperatures of the laser spot, re-emitting wall and entire hohlraum drive source

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