Determination of the Hohlraum<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>M</mml:mi></mml:math>-band Fraction by a Shock-Wave Technique on the SGIII-Prototype Laser Facility

Huo, Wen Yi; Lan, Ke; Li, Yongsheng; Yang, Dong; Li, Sanwei; Li, Xin; Wu, Congcong; Ren, Guoli; Zhao, Yiqing; Zou, Shiyang; Zheng, Wudi; Gu, Peng; Wang, Min; Yi, Rongqing; Jiang, Xiaohua; Song, Tianming; Li, Zhichao; Guo, Liang; Liu, Yonggang; Zhan, Xun; Wang, Feng; Peng, Xiaoshi; Zhang, Huan; Yang, Jiamin; Liu, Shenye; Jiang, Shaoen; Ding, Yongkun

doi:10.1103/physrevlett.109.145004

Cited by 36 publications

(6 citation statements)

References 15 publications

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“…The experiments are conducted on the SGIII-prototype laser facility [15,16], consisting of eight laser beams with 800 J per beam at 0.35 mm, and the eight laser beams simultaneously irradiate hohlraum from two ends at an incidence cone of 45 angle. It should be noted that the four laser beams from one LEH have 45 difference in azimuthal direction with those from the other LEH on the SGIII prototype.…”

mentioning

confidence: 99%

First demonstration of improving laser propagation inside the spherical hohlraums by using the cylindrical laser entrance hole

Huo

Yang

et al. 2016

Matter and Radiation at Extremes

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The octahedral spherical hohlraums have natural superiority in maintaining high radiation symmetry during the entire capsule implosion process in indirect drive inertial confinement fusion. While, in contrast to the cylindrical hohlraums, the narrow space between the laser beams and the spherical hohlraum wall is usually commented. In this Letter, we address this crucial issue and report our experimental work conducted on the SGIII-prototype laser facility which unambiguously demonstrates that a simple design of cylindrical laser entrance hole (LEH) can dramatically improve the laser propagation inside the spherical hohlraums. In addition, the laser beam deflection in the hohlraum is observed for the first time in the experiments. Our 2-dimensional simulation results also verify qualitatively the advantages of the spherical hohlraums with cylindrical LEHs. Our results imply the prospect of adopting the cylindrical LEHs in future spherical ignition hohlraum design.

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confidence: 99%

First demonstration of improving laser propagation inside the spherical hohlraums by using the cylindrical laser entrance hole

Huo

Yang

et al. 2016

Matter and Radiation at Extremes

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“…In the two-LEH spherical hohlraum, it cannot view the laser spot. And it is also influenced by the cold plasmas outside the hohlraum [11]. Thus the measured F-XRD radiation temperature is lower.…”

Section: Peak Radiation Temperaturementioning

confidence: 97%

“…The radiation temperature was measured by the Landen et al [9] soft x-ray spectrometer (SXS). However, it is affected by the field of view, observation direction and plasma condition [10,11]. It deviates from the 'real' radiation source inside hohlraum and cannot accurately reflect the 'real' x-ray flux on samples.…”

Section: Introductionmentioning

confidence: 99%

Study of the radiation temperature on ablator by using the shock wave technique

Ren

Zhang

et al. 2022

Plasma Phys. Control. Fusion

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A new diagnostic platform for more accurate diagnosis peak radiation temperature on ablator has been proposed. Nearly constant radiation temperature was obtained by 2-LEHs spherical hohlraum. And peak radiation temperature on ablator was determined by the shock wave technique. A high quality burn-through image of 2-step-shaped Au ablator was obtained in the experiment. The simulated mass ablation rate agrees well with the experimental result. On the other hand, the peak radiation temperature measured by flat-response X-ray detector(F-XRD) outside the hohlraum was of ~20eV's lower than that obtained by the shock wave technique. This deviation may result in ~20%'s decrease of mass ablation rate in simulation. Thus the new diagnostic platform can provide more accurate peak radiation temperature diagnosis. It can greatly support the ICF ignition target design.

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“…Our simulation indicate that CBET process with large crossing angle has certain chance to occur under the complicated hohlraum plasma conditions, and might be very important because of its potential to induce other LPI instabilities and destroy the spatio-temporal symmetry. Besides, our model can also be expanded to multi-beams cases, and our simulation method establishes a basic for analysis of future multi-beams experiments on the Shenguang series facilities Hao et al, 2014;Huo et al, 2014) and provides valuable references for the intending ignition target design.…”

Section: Discussionmentioning

confidence: 99%

Study of crossed-beam energy transfer process with large crossing angle in three-dimension

Liang

Zheng

et al. 2016

Laser Part. Beams

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In this paper, a three-dimensional (3D) model as a new module of LAP3D code is presented to study the crossed-beam energy transfer (CBET) process. This model is not limited by the paraxial approximation and can be used to deal with a large crossing angle case. Besides, this model is also appropriate for the multi-ion species conditions and even multibeams problems, which will be very helpful in relevant experiment analysis and the target design. In our 3D simulations, we take the overlapped beams with a 60°crossing angle as an example, and observe obvious energy transfer process, which indicates CBET process might occur between the incident laser beams with a large crossing angle when the matching condition is satisfied. This large crossing angle CBET process also can change the spatial shape of the beam spot, and may have some potential important influence on other laser-plasma interaction instabilities and the energy symmetry in hohlraum.

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Determination of the HohlraumM-band Fraction by a Shock-Wave Technique on the SGIII-Prototype Laser Facility

Cited by 36 publications

References 15 publications

First demonstration of improving laser propagation inside the spherical hohlraums by using the cylindrical laser entrance hole

First demonstration of improving laser propagation inside the spherical hohlraums by using the cylindrical laser entrance hole

Study of the radiation temperature on ablator by using the shock wave technique

Study of crossed-beam energy transfer process with large crossing angle in three-dimension

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