Yongkun Ding

Institute of Applied Physics and Computational Mathematics

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Shaoen Jiang

China Academy of Engineering Physics

110

Shenye Liu

China Academy of Engineering Physics

Jiamin Yang

China Academy of Engineering Physics

Dong Yang

China Academy of Engineering Physics

Zhichao Li

China University of Petroleum, Beijing

Sanwei Li

China Academy of Engineering Physics

Liang Guo

Chinese Academy of Engineering

Longfei Jing

China Academy of Engineering Physics

Jian Zheng

University of Science and Technology of China

Feng Wang

China Academy of Engineering Physics

Cooperative Institutions

Institute of High Energy Physics

886

Chinese Academy of Sciences

470

University of Chinese Academy of Sciences

420

China Academy of Engineering Physics

364

University of Science and Technology of China

263

COMSATS University Islamabad

260

Shanghai Jiao Tong University

245

Peking University

245

China Center of Advanced Science and Technology

227

Institute of Applied Physics and Computational Mathematics

189

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New two-dimensional space-resolving flux detection technique for measurement of hohlraum inner radiation in Shenguang-III prototype

Review of Scientific Instruments (2015)

Kuan Ren Shenye Liu Huabing Du Lifei Hou Longfei Jing

The space-resolving measurement of X-ray flux from a specific area (laser spot, re-emitting wall, or capsule) inside the hohlraum is an ongoing and critical problem in indirectly driven inertial-confinement fusion experiments. In this work, we developed a new two-dimensional space-resolving flux detection technique to measure the X-ray flux from specific areas inside the hohlraum by using the time- and space-resolving flux detector (SRFD). In two typical hohlraum experiments conducted at the Shenguang-III prototype laser facility, the X-ray flux and radiation temperature from an area 0.2 mm in diameter inside the hohlraum were measured through the laser entrance hole (LEH). The different flux intensities and radiation temperatures detected using the SRFD from the inner area of the LEH were compared with the result measured using the flat-response X-ray detector from the entire LEH. This comparison was also analyzed theoretically. The inner area detected using the SRFD was found to be the re-emitting wall area alone. This important improvement in space-resolving X-ray flux measurement will enhance the current X-ray flux space characterization techniques, thereby furthering the quantitative understanding of X-ray flux space behavior in the hohlraum.

Hohlraum

Radiation flux

10.1063/1.4934250

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Citations (2)

Acceleration and guiding of fast electrons by a nanobrush target

Physics of Plasmas (2010)

Zongqing Zhao L. H. Cao Leifeng Cao Jian Wang Huang Wen-Zhong

Laser interaction with a nanobrush target plasma is investigated at the SILEX-I laser facility [X. F. Wei et al., J. Phys. Conf. Ser. 112, 032010 (2008)] with a laser of intensity 7.9×1018 W/cm2. Highly collimated fast electron beams with yields of more than three times higher than that from the planar target can be produced. Two-dimensional particle-in-cell simulation confirms that a layered surface structure can increase the efficiency of laser energy absorption, and the resulting fast electrons are tightly collimated and guided by the plasma layers to a cross section of about the laser spot size.

Collimated light

10.1063/1.3507292

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Citations (48)

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)

Plasmoid Ejection and Secondary Current Sheet Generation from Magnetic Reconnection in Laser-Plasma Interaction

Physical Review Letters (2012)

Quan-Li Dong Shoujun Wang Quanming Lu Can Huang Dawei Yuan

Reconnection of the self-generated magnetic fields in laser-plasma interaction was first investigated experimentally by Nilson {\it et al.} [Phys. Rev. Lett. 97, 255001 (2006)] by shining two laser pulses a distance apart on a solid target layer. An elongated current sheet (CS) was observed in the plasma between the two laser spots. In order to more closely model magnetotail reconnection, here two side-by-side thin target layers, instead of a single one, are used. It is found that at one end of the elongated CS a fan-like electron outflow region including three well-collimated electron jets appears. The ($>1$ MeV) tail of the jet energy distribution exhibits a power-law scaling. The enhanced electron acceleration is attributed to the intense inductive electric field in the narrow electron dominated reconnection region, as well as additional acceleration as they are trapped inside the rapidly moving plasmoid formed in and ejected from the CS. The ejection also induces a secondary CS.

Plasmoid

Collimated light

Current sheet

10.1103/physrevlett.108.215001

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Citations (110)

Experimental investigation of diffusive supersonic radiation propagation in low density CH foam doped with Cu

Czechoslovak Journal of Physics (2004)

Shaoen Jiang Yongkun Ding Yue Huang Z. J. Zheng Ke Sun

Hohlraum

Streak camera

Radiation properties

Opacity

10.1007/bf03166438

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Citations (0)

Feasibility of transition radiation as a diagnostic of hot electrons generated in indirect-drive experiment

Physics of Plasmas (2018)

Yaoyuan Liu Yongkun Ding Jian Zheng

In the experiment of indirect-drive inertial confinement fusion, hot electrons in hohlraum are usually inferred from the bremsstrahlung, measured with filter-fluoresce X-ray spectrometer. Here, we study the feasibility of measuring hot electrons by detecting the transition radiation, emitted from energetic electrons passing through the outer surface of hohlraum. With the aid of Monte Carlo simulations, it was found that the intensity of black-body radiation in optical range, due to the energy deposition of electrons, is at least one order of magnitude larger than that of optical transition radiation, but two orders of magnitude smaller than the intensity in THz range. Hence, it would be plausibly feasible to detect the transition radiation in the far infrared and THz range. Furthermore, the sensitivity of intensity versus thickness and temperature are discussed with two temperature components of hot electrons. Finally, a proposal of diagnostic for hot electrons is put forward by adopting the wedge or stepped plate.

Hohlraum

Transition radiation

10.1063/1.5028540

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Citations (1)

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)

Thin shell model for the nonlinear fluid instability of cylindrical shells

Physics of Plasmas (2018)

K. G. Zhao Cun Xue L. F. Wang W. H. Ye J. F. Wu

A thin shell model is developed to describe the nonlinear fluid instability growth in a gravitational field or/and driven by a pressure difference in cylindrical convergent geometry in the style of Ott [Phys. Lett. 29, 1429 (1972)]. The differential equations of motion are obtained by analyzing the forces (i.e., the gravitational field and pressure difference) on the cylindrical thin shell. The nonlinear evolution and deformation of the thin shell in the presence of the gravitational field or/and pressure difference are investigated by numerical calculations. When the perturbed thin shell is driven by the gravitational field, the linear growth rates obtained from our model are compared with the analytical formula and they agree well with each other. Furthermore, the evolution of thin shell overall agrees with the weakly nonlinear (WN) theory [Wang et al., Phys. Plasmas 20, 042708 (2013)]. When the thin shell with an unperturbed interface is driven by a nonuniform pressure difference with a single-mode spatial modulation, the perturbation growth can be observed at the surface. In addition, mode-coupling processes between the single-mode perturbed interface and the large-scale drive asymmetry on the thin shell are addressed.

10.1063/1.5044443

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Citations (4)

Reducing wall plasma expansion with gold foam irradiated by laser

Physics of Plasmas (2015)

Pengfei Zhang Yongkun Ding Shaoen Jiang Jiamin Yang Hang Li

The experimental study on the expanding plasma movement of low-density gold foam (∼1% solid density) irradiated by a high power laser is reported in this paper. Experiments were conducted using the SG-III prototype laser. Compared to solid gold with 19.3 g/cc density, the velocities of X-ray emission fronts moving off the wall are much smaller for gold foam with 0.3 g/cc density. Theoretical analysis and MULTI 1D simulation results also show less plasma blow-off, and that the density contour movement velocities of gold foam are smaller than those of solid gold, agreeing with experimental results. These results indicate that foam walls have advantages in symmetry control and lowering plasma fill when used in ignition hohlraum.

Hohlraum

National Ignition Facility

10.1063/1.4935381

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Citations (16)

Use of foam gold to improve hohlraum's performance

APS (2017)

Lu Zhang Longyu Kuang Zhiwei Lin Longfei Jing Hang Li

Hohlraum

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