A5102972791- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Atomic and Molecular Physics
- High-pressure geophysics and materials
- Combustion and Detonation Processes
- Computational Fluid Dynamics and Aerodynamics
- Gas Dynamics and Kinetic Theory
- Optical properties and cooling technologies in crystalline materials
- Optical Systems and Laser Technology
- Diamond and Carbon-based Materials Research
- Magnetic confinement fusion research
- IoT Networks and Protocols
- Advanced Semiconductor Detectors and Materials
- Astronomical Observations and Instrumentation
- Cosmology and Gravitation Theories
- Plasma and Flow Control in Aerodynamics
- Laser Material Processing Techniques
- Solid State Laser Technologies
- Dark Matter and Cosmic Phenomena
- X-ray Spectroscopy and Fluorescence Analysis
- Dust and Plasma Wave Phenomena
- Power Line Communications and Noise
- Particle Accelerators and Free-Electron Lasers
Sichuan University
2020
Institute of Applied Physics and Computational Mathematics
2004-2019
We report constraints on the dark photon effective kinetic mixing parameter (${\kappa}$) with data taken from two ${p}$-type point-contact germanium detectors of CDEX-10 experiment at China Jinping Underground Laboratory. The 90\% confidence level upper limits ${\kappa}$ solar 205.4 kg-day exposure are derived, probing new space masses (${m_V}$) 10 to 300 eV/${c^2}$ in direct detection experiments. Considering as cosmological matter, ${m_V}$ 0.1 4.0 keV/${c^2}$ set 449.6 data, a minimum...
The proposal of simultaneously determining the hohlraum peak radiation temperature T(R) and M-band fraction f(M) by shock velocity measurement technique [Y. S. Li et al. Phys. Plasmas 18, 022701 (2011)] is demonstrated for first time in recent experiments conducted on SGIII-prototype laser facility. In experiments, are determined using observed velocities Al Ti. For Au used about 160 eV around 4.3% under a 1 ns pulse 2 kJ. results from this method complementary to those broadband x-ray...
A Lagrangian compatible radiation hydrodynamic algorithm and the nuclear dynamics computing module are developed implemented in LARED Integration code, which is a code based on 2-D cylindrical coordinates for numerical simulation of indirect-drive Inertial Confined Fusion. number 1-D ignition implosion simulations by using improved (ILARED) presented show that results consistent with those computed RDMG, while low-mode radiative asymmetry instability growth, according to physical analysis...
The hohlraum radiation properties are studied experimentally by the Shenguang-III prototype laser facility and numerically two-dimensional code LARED with multi-group transfer model. measured temperature is consistent prediction of simulations in a wide energy range, suggesting that x-ray conversion efficiency around 75% at peak temperature. delicate experiments further show intensity inside significantly non-uniform. flux hot spot region over twice higher than re-emitted wall region. Good...
The Hohlraum physics experiments performed on the SGIII-prototype laser facility are simulated by using our two-dimensional radiation hydrodynamic code LARED-H, and influence of intensity simulations is studied. Both temporal temperature x-ray spectrum from agree well with observations, except that M-band fraction (greater than 2 keV) obviously smaller observation. According to study, coupling efficiency around 70% for Hohlraums.
Abstract In this paper, the plasma-filling model was extrapolated to case of a hohlraum driven by shaped laser pulse, and extended used obtain an initial design size. A density criterion n e = 0.1 for designing hohlraums which have low plasma filling with maximum achievable radiation. The method successfully half size three-step pulse on SGIII prototype U ignition. It shown that can provide reasonable optimal two-dimensional code.
The radiation temperature TR and M-band fraction fM inside the vacuum Au hohlraum have been experimentally determined by a shock wave technique broadband soft x-ray spectrometer (SXS) on SGIII-prototype laser facility. From results of technique, is about 202 eV, 9% for hohlraums driven 1 ns flattop pulse 6 kJ energy. Continuous Phase Plate (CPP) beam smoothing applied in experiment, which increases to 207 eV while has almost no influence fM. Comparisons between from two kinds technologies...
Experimental measurement of radiation temperature by a streaked optical pyrometer and soft X-ray spectrometer viewing through the laser entrance hole are performed on SG-Ⅲ prototype facility. It was found that two methods compares well. Using power balance relation，the laser-hohlraum coupling efficiency for 1.0 mm×1.7 mm hohlraum mm×2.1 is around 50%—55%.
In the deuterium-tritium inertial confinement fusion implosion experiments on National Ignition Facility, hot spot and surrounding main fuel layer show obvious P2 asymmetries. This may be caused by large positive radiation flux asymmetry during peak pulse resulting form poor propagation of inner laser beam in gas-filled hohlraum. The symmetry evolution ignition capsule implosions is investigated applying asymmetries different time intervals. A series two-dimensional simulation results that a...
The low-mode shell asymmetry and high-mode hot spot mixing appear to be the main reasons for performance degradation of National Ignition Facility (NIF) implosion experiments. effects mode coupling between P2 radiation flux intermediate-mode L = 24 capsule roughness on ignition are investigated by two-dimensional hydrodynamic simulations. It is shown that amplitudes new modes generated in good agreement with second-order equation during acceleration phase. later flow field not only shows...
This paper introduces the radiation-hydrodynamic code LARED-Integration, including its physical background, model equations, numerical algorithms and results. The is developed by Institute of Applied Physics Computational Mathematics (IAPCM) mainly implemented to simulate whole process indirect-drive laser inertial confinement fusion (ICF). can also be used study direct-drive radiation-drive capsule implosion process. Compared with experimental data results 1D code, reliability...
The cylindrical vacuum hohlraum energy at the SGIII laser facility [X. T. He and W. Y. Zhang, Eur. Phys. J. D 44, 227 (2007) Zheng et al., High Power Laser Sci. Eng. 4, e21 (2016)] is investigated for first time. size are intermediate between Nova NIF typical experiments. It found that exhibits an x-ray conversion efficiency of about 85%, which more close to hohlraum. LARED simulations underestimate 15% radiation flux measured from entrance hole, while capsule drive inferred bangtime roughly...
The symmetric radiation drive is essential to the capsule implosion in indirect fusion but hard achieve due non-uniform distribution inside hohlraum. In this work, properties of both vacuum and gas-filled hohlraums are studied by investigating angular temperature experimentally numerically. It found that hohlraum induces variation between different view angles. simulations show can be affected electron heat flux. measured more consistent with when flux limiter fe=0.1. Comparisons experiments...
The low-mode radiation flux asymmetry in the hohlraum is a main source of performance degradation National Ignition Facility (NIF) implosion experiments. To counteract deleterious effects large positive P2 during peak drive, this paper develops new tuning method called asymmetric-shell ignition capsule design which adopts intentionally asymmetric CH ablator layer or deuterium-tritium (DT) ice layer. A series two-dimensional simulations have been performed, and results show that DT can...
Recently, hohlraum experiments were performed at the Shenguang-II (SG-II) laser facility [Lin et al., Chin. J. Lasers B10, Suppl. IV6 (2001)]. The measured maximum radiation temperature was 170 eV for standard and 150 a 1.5-scaled one. This paper discusses coupling efficiency in terms of theoretical model [Phys. Plasmas 8, 1659 (2001)] numerical simulation. A 2D laser–hohlraum code, LARED-H [Chin. Comput. Phys. 19, 57 (2002)], gives satisfactory coincidence with time-resolved temperature....
In this paper, a six-cylinder-port hohlraum is proposed to provide high symmetry flux on capsule. It designed ignite capsule with 1.2-mm radius in indirect-drive inertial confinement fusion (ICF). Flux and laser energy are calculated by using three-dimensional view factor method balance hohlraum. Plasma conditions analyzed based the two-dimensional radiation-hydrodynamic simulations. There no Ylm (l ⩽ 4) asymmetry when influences of entrance holes (LEHs) spots cancel each other out suitable...
In order to study the laser plasma instabilities (LPIs) in context of some novel six-side laser-driven indirect designs like six-cylinder-port hohlraum and three-axis cylindrical hohlraum, where beams inject with a large angle. LPI experiments only outer were designed performed based on current arrangement condition SGIII facility for first time. Stimulated Brillouin backscatter (SBS) was found be dominant instability high instantaneous reflectivity experiments. A typical feature obtained...
Low-mode asymmetries in the laser-indirect-drive inertial confinement fusion implosion experiments conducted on National Ignition Facility [G. H. Miller et al., Nucl. Fusion 44, S228 (2004)] are deemed main obstacles hindering further improvement of nuclear performance deuterium-tritium-layered capsules. The dominant seeds these include P2 and P4 x-ray drives asymmetry introduced by supporting “tent.” Here, we explore effects another possible seed that can lead to low-mode asymmetric...
An electron heat transport model is given for studying laser-to-x-ray conversion of inertial confinement fusion. The flux derived based on a non-Maxwellian distribution, and the behavior discussed. effect distribution inverse bremsstrahlung heating rate electron-ion transfer are also included in present model. simulation results show that effects laser absorption efficiency, efficiency temperature coronal region important.
The spectral character of X-ray emitted from laser-irradiated gold disk is studied by using the one-dimensional non-LTE multigroup radiation transport hydrodynamics code RDMG. applicability “three-temperature” model in which described with thermal conduction approximation checked. simulation results show that laser-produced plasma non-LTE, and atom has significant effect on structure spectrum. However, states, laser absorption efficiency conversion efficiency, are calculated model, almost...
In this paper, a six-cylinder-port hohlraum is proposed to provide high symmetry flux on capsule. It designed ignite capsule with 1.2 mm radius in indirect-drive inertial confinement fusion (ICF) . Flux and laser energy are calculated by using three dimensional view factor method balance hohlraums. Plasma conditions analyzed based the two radiation-hydrodynamic simulations. There no Ylm (l<=4) asymmetry when influences of entrance holes (LEHs) spots cancel each other out suitable target...
Aiming at the requirement of on-line detailed atomic model in radiation hydrodynamic simulations, we propose a general model, multi-average ion collisional-radiative (MAICRM), to rapidly simulate ionization and charge state distribution hot dense plasma under non-local thermal equilibrium (NLTE) conditions. In this an average is used characterize features all states one single state, including orbital occupation total population states. The rate equations for occupations are derived from...
In the target design of Inertial Confinement Fusion (ICF) program, it is common practice to apply radiation hydrodynamics code study key physical processes happening in ICF process, such as hohlraum physics, drive symmetry, capsule implosion physics radiation-drive approach ICF. Recently, many efforts have been done develop our 2D integrated simulation capability laser fusion with a variety optional models and numerical methods. order effectively integrate existing codes facilitate...
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 increasing. One key issues lack advanced knowledge laser-hohlraum coupling process, which has shown complexity hohlraum environment. Optical Thomson scattering (OTS) becomes standard technique diagnosing ICF plasma parameters, due its capability providing unperturbed, local precise measurement. The...