A5100662418- Laser-Plasma Interactions and Diagnostics
- Nuclear Physics and Applications
- Laser-induced spectroscopy and plasma
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Pulsed Power Technology Applications
- Ion-surface interactions and analysis
- Magnetic confinement fusion research
- High-pressure geophysics and materials
- Advanced X-ray Imaging Techniques
- Nuclear reactor physics and engineering
- Advanced Fiber Laser Technologies
- Radiation Therapy and Dosimetry
- Robotic Mechanisms and Dynamics
- Computational Fluid Dynamics and Aerodynamics
- Advanced Numerical Analysis Techniques
- Diamond and Carbon-based Materials Research
- Vacuum and Plasma Arcs
- Medical Imaging Techniques and Applications
- Fusion materials and technologies
- Gamma-ray bursts and supernovae
- Laser-Matter Interactions and Applications
- Electrostatic Discharge in Electronics
- Plasma Diagnostics and Applications
China Academy of Engineering Physics
2005-2024
Xiangtan University
2024
Princeton Plasma Physics Laboratory
2016
University of Michigan
2016
SLAC National Accelerator Laboratory
2016
Sandia National Laboratories
2016
Los Alamos National Laboratory
2016
Czech Academy of Sciences, Institute of Physics
2016
University of Warwick
2016
European X-Ray Free-Electron Laser
2016
We present results from time-resolved X-ray imaging and inelastic scattering on collective excitations. These data are then employed to infer the mass density evolution within laser-driven shock waves. In our experiments, thin carbon foils first strongly compressed driven into a dense state by counter-propagating The different measurements agree that graphite sample is about twofold when waves collide, sharp increase in forward indicates disassembly of 1 ns thereafter. can benchmark...
This work is presenting the modeling of and experimental studies performed on multi-gap gas switch (MGS) designed for linear transformer drivers (LTD). The MGS employs corona discharge in dry air voltage grading across its six gaps, therefore, achieves compactness environmentally friendliness. Circuit was performed, followed by analysis tests current grading, showing a good self-break property switch. Trigger properties were subsequently analyzed experimentally investigated. verified...
Compton camera is capable of visualizing the distribution radioactivity based on scattering kinematics, and can be applied in nuclear accident emergency response, decontamination, homeland security etc. A prototype has been constructed consisting two 4×4 SiPM-Ce: GAGG scintillator arrays. The signals a SiPM array were converted into 4 position-weighted outputs with capacitive network circuit collected by CAEN digitizer. Two-dimensional flood images energy responses detector modules obtained....
A two-dimensional stigmatic x-ray imaging scheme, consisting of two spherically bent crystals, one concave and convex, was recently proposed [M. Bitter et al., Rev. Sci. Instrum. 83, 10E527 (2012)]. The Bragg angles the radii curvature crystals this scheme are matched to eliminate astigmatism satisfy condition across both crystal surfaces for a given energy. In paper, we consider more general configurations which allow us vary magnification pair has been validated first time by x-rays...
Z-pinch dynamic hohlraum experiments have been carried out at the Julong-1 facility by imploding a nested tungsten wire array, which is configured with 20/10 mm diameter and 168/84 wires of 6.0 μm in for outer/inner onto 10 mg/cc C15H20O6 foam converter radius 2.3 mm. Detailed processes shock formation, propagation, radiation transfer were experimentally observed using an on-axis x-ray imaging system simultaneous dual spectral channels. When array plasma impacts converter, thermalization...
This paper describes a new type of x-ray crystal spectrometer, which can be used in combination with gated detectors to obtain spectra from laser-produced plasmas high (sub-ns) time resolution. The spectrometer consists convex, spherically bent crystal, images individual spectral lines as perfectly straight across multiple, sequentially gated, strip detectors. Since the Bragg-reflected rays are divergent, distance between detector and is arbitrary, so that this appropriately chosen optimize...
This paper proposes a method for calibrating the discrete element modeling and simulation parameters of PS@CeO2 core-shell composite abrasive particles (CSCAP). Firstly, microstructure prepared CSCAP was measured through physical tests. Based on principle structural similarity, model with ratio 21.34 established using particle cluster employing different contact models. The inner core were connected linear model, while outer shell parallel bonding model. Similarly, between at inner-shell...
In this research, ∼0.14-micron-thick aluminum tamped by plastic is heated up to ∼110eV the x-ray pulse from Z-pinch-driven dynamic Hohlraum on an 8-MA machine in China. After ∼6-ns heating stage, higher-energy xrays ∼2-ns- long backlight pass through hot aluminum. The transmission estimated comparing radiation passing sample one shot with only another shot, spectra obtained using elliptically bent concave crystal spectrometer. reveals features corresponding absorption Li-like and a series of...
Routine diagnostics of total x-ray energy and peak power at an 8-MA pulsed-power generator in China will be described, together with calibrations. Successfully measurements those Z-pinch dynamic hohlraum low radiation temperature 0∼ 7 eV were provided. Also presented are results from a flat response diode (XRD) for comparison. It is found that, such application, free-standing (FS) bolometer agrees well that by scintillant meter (SPM), but twice higher than XRD. This discrepancy lies spectral...
The thermonuclear yield from deuterium-filled capsule implosions driven by Z-pinch dynamic hohlraums on an 8-MA pulsed power facility is diagnosed Ag activation and neutron time-of-flight (nTOF). However, both detector systems suffer excessive bremsstrahlung background. Tests the system suggest that may produce such intense super-MeV x-ray background resulting photonuclear-excitation reactions can overwhelm potential signal. In nTOF detectors, high generates afterglow in scintillator...
One dimensional spatially resolved high resolution x-ray spectroscopy with spherically bent crystals and 2D pixelated detectors is an established technique on magnetic confinement fusion (MCF) experiments world wide for Doppler measurements of spatial profiles plasma ion temperature flow velocity. This being further developed diagnosis High Energy Density Physics (HEDP) plasmas at laser-plasma facilities synchrotron/x-ray free electron laser (XFEL) facilities. Useful (micron scale) such...
This paper reports some important properties of a dynamic hohlraum radiation source intended to study the high-temperature opacity medium-Z atoms. The time-resolved axial power in two x-ray diodes gives time-evolution an equivalent black-body temperature that peaks at ∼260 eV stagnation. Time-gated framing pinhole images show comprises intense core lasts for ∼2 ns preceded by 10-ns-long lower-temperature implosion phase emits mostly softer x rays. Combining with soft brightness reaches 130...
In ongoing attempts to generate thermonuclear neutrons with the Z-pinch dynamic hohlraum concept at an 8-MA pulsed power facility, it has become possible determine upper limit for neutron yield. The time-of-flight diagnostic uses thick Pb shields and a specifically formulated fast liquid scintillator coupled gated photomultiplier tubes mitigate hard bremsstrahlung x-ray (HXR) background that would otherwise overwhelm potential signal, its suppression gives upper-limit estimation A...
A study of the evolution and structure magnetically driven converging radiative shock waves generated in Z-pinch foil liner implosion at an 8-MA pulsed-power facility is presented. End-on extreme ultraviolet images show inward propagating that circular to <±5% as a function azimuthal angle, with standard deviation emission intensity <±30%, implying good cylindrical symmetry. The launch time trajectory are determined by linear fitting measured data, giving speed Mach 6....
Microchannel plate (MCP) photomultiplier tubes (PMTs) are frequently used in experimental diagnostics, where they operated single-pulse current measurement mode. However, considering the significant amplitude fluctuations measured signal, resulting output signal from MCP-PMT is inevitably distorted by gain saturation. Therefore, understanding correlation between and saturation critical assessing extent of distortion determining level. This knowledge allows for a more precise assessment input...
In conceptual design of the prototype for SG-III facility, a full aperture electro-optical switch was placed between cavity mirror and main amplifier to isolate reflected beams. The beam on is 240mm×240mm square. Pockells cells conversional with coaxial ring electrodes can not scale such large square aperture. 1980s, plasma electrode Pockels cell (PEPC) concept invented at LLNL. It uses transparent formed through gas discharge as apply voltage across switching crystal rotate polarization...