Liang Guo

Chinese Academy of Engineering

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Zhichao Li

China University of Petroleum, Beijing

Dong Yang

China Academy of Engineering Physics

Yongkun Ding

Institute of Applied Physics and Computational Mathematics

Sanwei Li

China Academy of Engineering Physics

Shaoen Jiang

China Academy of Engineering Physics

Shenye Liu

China Academy of Engineering Physics

Jiamin Yang

China Academy of Engineering Physics

Lifei Hou

Shandong University

Xiaoshi Peng

China Academy of Engineering Physics

Xiayu Zhan

China Academy of Engineering Physics

Cooperative Institutions

China Academy of Engineering Physics

152

Chinese Academy of Engineering

106

Institute of Applied Physics and Computational Mathematics

Peking University

Shanghai Jiao Tong University

Laser Fusion Research Center

Chinese Academy of Sciences

Laser Research Institute

University of Science and Technology of China

University of Chinese Academy of Sciences

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Generation and characterization of millimeter-scale plasmas for the research of laser plasma interactions on Shenguang-III prototype

Chinese Physics B (2010)

Zhichao Li Jian Zheng Yongkun Ding Qiang Yin Xiaohua Jiang

In order to produce millimeter-scale plasmas for the research of laser-plasma interactions (LPIs), gasbag target is designed and tested on Shenguang-III prototype laser facility. The x-ray pinhole images show that millimeter-scale plasmas are produced with the gasbag. The electron temperature inferred from the stimulated Raman scattering (SRS) spectrum is about 1.6 keV. The SRS spectrum also indicates that the electron density has a flat region within the duration of 200 ps. The obvious differences between the results of the gasbag and that of the void half hohlraum show the feasibility of the gasbag target in creating millimeter-scale plasmas. The LPIs in these millimeter-scale plasmas may partially mimic those in the ignition condition because the duration of the existence of a flat plasma density is much larger than the growth time of the two main instabilities, i.e., SRS and stimulated Brillouin scattering (SBS). So we make the conclusion that the gasbag target can be used to research the large-scale LPIs.

Hohlraum

Thomson scattering

10.1088/1674-1056/19/12/125202

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Citations (14)

Comparing the soft x-rays transport in Si and Ge-sandwich targets by measuring transmission flux

Physics of Plasmas (2017)

Lu Zhang Liling Li Liang Guo Longfei Jing Zhiwei Lin

Mid-Z dopant in ablator is very important in point design targets. In this paper, we develop a method to evaluate the soft x-ray transport of doped material with one dimensional planar target. The targets are designed as sandwich, so that the mid-layer is heated by M band, shock and thermal wave. The transmission fluxes from heated targets are measured with band-pass x-ray diodes. The Si and Ge dopants are evaluated with this method. The experimental results show that 1–1.6 keV x-ray transmission flux through Si-sandwich is higher than that through Ge-sandwich all the time. Also, the comparison of opacities shows that the opacity of Si is lower than that of Ge in the range of 1–1.6 keV, which is consistent with the experimental results.

Opacity

10.1063/1.4977911

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Citations (1)

Recent research progress of optical Thomson scattering in laser-driven inertial confinement fusion

High Power Laser and Particle Beams (2020)

Li Zhichao Zhao Hang Gong Tao Xin Li Dong Yang

Currently, laboratory created energy density of laser-driven inertial confinement fusion (ICF) is extremely close to that for ignition, while the divergence between experiment and simulation is increasing. One of the key issues is the lack of advanced knowledge of laser-hohlraum coupling process, which has shown the complexity of hohlraum environment. Optical Thomson scattering (OTS) becomes the standard technique for diagnosing the ICF hohlraum plasma parameters, due to its capability of providing unperturbed, local and precise measurement. The development of OTS in China is closely related with the Shenguang series laser facilities, on which most of the ICF experiments are carried out. In recent years, 4ω(263 nm) Thomson scattering technique has been set up on Shenguang-III prototype and 100 kJ-level laser facility, the corresponding results help the understanding of ICF physics. In the near future, several novel methods will be developed, for high-precision diagnostics of ICF ignition hohlraum plasmas and the research of new physical phenomena.

Hohlraum

National Ignition Facility

Thomson scattering

Nova (rocket)

10.11884/hplpb202032.200130

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Citations (1)

The study of radiation damage of yeast cells in Cryo-soft x-ray tomography

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2017)

Liang Guo Yong Guan Chenxi Wei Yue Hu Yangchao Tian

Cryo soft X-ray tomography (Cryo-SXT) is a valuable tool for high-resolution three dimensional (3D) imaging of cells in near-native preservation state. Cryo-immobilization of cells based on rapid cryogenic freezing is crucial to obtain good imaging in Cryo-SXT. In order to acquire high contrast image of live cells, it need to prepare the specimen ice as thin as possible. However, as the thickness of the ice layer is further reduced, the live cells may be destroyed during the tilt series data collection of 3D imaging due to radiation. Thus, it is essential to seek out a proper thickness range of the ice layer to get high contrast image without radiation damage of cells. For further understanding the relationship between thickness of ice layer and degree of radiation damage, yeast cells with different thickness of ice layer were imaged using Cryo-SXT. Finally the ice layer with thickness about 10 μm was confirmed to be proper for good imaging.

radiation damage

High contrast

10.1117/12.2268715

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Corrigendum to “First demonstration of improving laser propagation inside the spherical hohlraums by using the cylindrical laser entrance hole” [Matter Radiation Extremes 1 (1) (2016) 2–7]

Matter and Radiation at Extremes (2016)

Wenyi Huo Zhichao Li Dong Yang Ke Lan Jie Liu

On page 2 of this letter, there is a misprint in the unit.The unit of the geometrical dimension of the spherical hohlraums on this page should always be "mm" rather than "mm", i.e. in the second paragraph, "…with 800 J per beam at 0.35 mm…" should be "…with 800 J per beam at 0.35 mm…", "The slit of 400 mm width is parallel…" should be "The slit of 400 mm width is parallel…", "The laser focal diameter is about 500 mm…" should be "The laser focal diameter is about 500 mm…"; in the third paragraph, "…we take 850 mm as the radius…" should be "…we take 850 mm as the radius…", "The LEH radius R L is 400 mm…" should be "The LEH radius R L is 400 mm…", "…the radius of the cylindrical LEH outer ring is taken as 1.5 R L ¼ 600 mm" should be "…the radius of the cylindrical LEH outer ring is taken as 1.5 R L ¼ 600 mm".This mistake does not affect any of the main results of the original letter.

Hohlraum

10.1016/j.mre.2016.05.002

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

New Journal of Physics (2015)

Liang Guo Yongkun Ding Pifeng Xing Sanwei Li Longyu Kuang

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 × 1014 W cm−2, we observe that the hard x-ray (hν 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.

Hohlraum

10.1088/1367-2630/17/11/113004

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

Physics of Plasmas (2014)

Huasen Zhang Dong Yang Peng Song Shiyang Zou Yiqing Zhao

The hohlraum radiation properties are studied experimentally by the Shenguang-III prototype laser facility and numerically by the two-dimensional code LARED with the multi-group radiation transfer model. The measured radiation temperature is consistent with the prediction of the simulations in a wide laser energy range, suggesting that the x-ray conversion efficiency is around 75% at the peak radiation temperature. The delicate hohlraum experiments further show that the radiation intensity inside the hohlraum is significantly non-uniform. The measured radiation flux of the hot spot region is over twice higher than that of the re-emitted wall region. Good agreements between the experiments and simulations further demonstrate the validity of the LARED code to study the hohlraum radiation properties.

Hohlraum

Radiation flux

10.1063/1.4901919

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Citations (27)

Stimulated Raman scattering instability of a left-handed circularly polarized laser in strongly axially magnetized plasmas

Physics of Plasmas (2019)

K. Q. Pan Liang Guo Zhichao Li Dong Yang Sheng Li

The stimulated Raman scattering (SRS) instability of a left-handed circularly polarized (LH-CP) laser in strongly axially magnetized plasmas is investigated in detail with the help of one-dimensional (1D) and two-dimensional (2D) particle-in-cell (PIC) simulations. Since the LH-CP laser has a larger critical density in the axially magnetized plasmas, the SRS instability could be excited in over quarter-critical density plasmas, which is verified by the PIC simulations. This phenomenon could be used to amplify a seed with a frequency smaller than half of the laser frequency, which is impossible for traditional simulated Raman amplification. The simulation results also show that the scattered laser becomes right-handed circularly polarized. With this conclusion, we re-derive the temporal linear growth rate of the SRS instability of the LH-CP laser in the axially magnetized plasmas. The results show that the larger the external magnetic field is the smaller the temporal growth rate is. The suppression of the SRS by the external axial magnetic field in the linear region is verified by both 1D and 2D PIC simulations. The simulation results also show that the phase velocity of the electron plasma wave (EPW) will be decreased by the external magnetic field as expected by the theory, which makes it easier for the EPW to trap electrons and for the nonlinear frequency shift of the EPW to happen. As a result, not only the linear growth rate of SRS but also the saturation level of SRS is decreased by the external axial magnetic field. When the external magnetic field is strong enough, the saturation level of SRS can be suppressed by several times. So, this work also provides an efficient way of suppressing the SRS instability. Besides, the 2D simulation results show that some transverse instabilities of the electron plasma wave are also suppressed by the external magnetic field and this suppression will provide us with an electron plasma wave with a better structure, which may benefit the simulated Raman amplification.

Axial symmetry

Thomson scattering

10.1063/1.5079524

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Citations (1)

Investigation of the cylindrical vacuum hohlraum energy in the first implosion experiment at the SGIII laser facility

Physics of Plasmas (2018)

Huasen Zhang Wei Jiang Fengjun Ge Peng Song Shiyang Zou

The cylindrical vacuum hohlraum energy at the SGIII laser facility [X. T. He and W. Y. Zhang, Eur. Phys. J. D 44, 227 (2007) and W. Zheng et al., High Power Laser Sci. Eng. 4, e21 (2016)] is investigated for the first time. The hohlraum size and the laser energy are intermediate between the Nova and NIF typical hohlraum experiments. It is found that the SGIII hohlraum exhibits an x-ray conversion efficiency of about 85%, which is more close to that of the NIF hohlraum. The LARED simulations of the SGIII hohlraum underestimate about 15% of the radiation flux measured from the laser entrance hole, while the capsule radiation drive inferred from the x-ray bangtime is roughly consistent with the experiments. The underestimation of the SGIII hohlraum radiation flux is mainly caused by the more enclosed laser entrance hole in the LARED simulation. The comparison between the SGIII and NIF hohlraum simulations by LARED indicates that the LARED generally underestimates the measured radiation flux by 15% for the high x-ray conversion efficiency hohlraums, while it can roughly predict the capsule radiation drive inside the hohlraum.

Hohlraum

Implosion

Radiation flux

10.1063/1.5013252

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Citations (10)

Enhancement of the surface emission at the fundamental frequency and the transmitted high-order harmonics by pre-structured targets

High Power Laser Science and Engineering (2019)

K. Q. Pan Dong Yang Liang Guo Zhichao Li Sheng Li

Laser interaction with an ultra-thin pre-structured target is investigated with the help of both two-dimensional and three-dimensional particle-in-cell simulations. With the existence of a periodic structure on the target surface, the laser seems to penetrate through the target at its fundamental frequency even if the plasma density of the target is much higher than the laser’s relativistically critical density. The particle-in-cell simulations show that the transmitted laser energy behind the pre-structured target is increased by about two orders of magnitude compared to that behind the flat target. Theoretical analyses show that the transmitted energy behind the pre-structured target is actually re-emitted by electron ‘islands’ formed by the surface plasma waves on the target surfaces. In other words, the radiation with the fundamental frequency is actually ‘surface emission’ on the target rear surface. Besides the intensity of the component with the fundamental frequency, the intensity of the high-order harmonics behind the pre-structured target is also much enhanced compared to that behind the flat target. The enhancement of the high-order harmonics is also related to the surface plasma waves generated on the target surfaces.

Particle-in-cell

Fundamental frequency

10.1017/hpl.2019.20

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Citations (5)