A5101761789- Laser-Plasma Interactions and Diagnostics
- Nuclear Physics and Applications
- Advanced Optical Sensing Technologies
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Radiation Detection and Scintillator Technologies
- Ion-surface interactions and analysis
- Pulsed Power Technology Applications
- Medical Imaging Techniques and Applications
- Electrostatic Discharge in Electronics
- Photoacoustic and Ultrasonic Imaging
- Click Chemistry and Applications
- Particle accelerators and beam dynamics
- Vacuum and Plasma Arcs
- Radical Photochemical Reactions
- Advanced X-ray Imaging Techniques
- Optical Systems and Laser Technology
- Optical Coherence Tomography Applications
- Advanced Surface Polishing Techniques
- Semiconductor Quantum Structures and Devices
- Gyrotron and Vacuum Electronics Research
- Surface Modification and Superhydrophobicity
- Electrical Fault Detection and Protection
- Fluid Dynamics and Thin Films
- Thallium and Germanium Studies
Northwest Institute of Nuclear Technology
2003-2024
Robert Bosch (Germany)
2023
Xi'an Jiaotong University
2014-2021
Weatherford College
2019-2021
George Institute for Global Health
2021
Peking University
2021
Princeton University
2020
Yale University
2020
Harvard University
2020
Brigham and Women's Hospital
2020
In this paper, we use a Monte Carlo (MC) simulation based on Geant4 to investigate the influence of four parameters spatial resolution lens-coupled lutetium yttrium orthosilicate (LYSO) scintillator, including thickness LYSO F-number and minification factor lens, incident position gamma-rays. Simulation results show that when gamma-rays are along lens axis, smaller thickness, larger F-number, factor, higher resolution, with an isotropic point spread function (PSF). As deviates from...
As the most powerful x-ray source in laboratories, wire array Z pinches have been of great relevance to inertial confinement fusions, laboratory astrophysics, and other high-energy density applications. In order produce with greater power higher efficiency, dynamics has investigated extensively, various methods proposed improve implosion quality array. This review focuses on experimental theoretical investigations regarding effects dielectric coatings electrical exploding wires pinches....
Compressed ultrafast photography (CUP) is a computational imaging technology capable of capturing transient scenes in picosecond scale with sequence depth hundreds frames. Since the inverse problem CUP an ill-posed problem, it challenging to further improve reconstruction quality under condition high noise level and compression ratio. In addition, there are many articles adding external charge-coupled device (CCD) camera system form time-unsheared view because added constraint can images....
The domain of gamma-ray imaging necessitates technological advancements to surmount the challenge energy-selective imaging. Conventional systems are constrained in their dynamic focus on specific energy ranges, a capability imperative for differentiating emissions from diverse sources. This investigation introduces an innovative system predicated detection recoil electrons, addressing demand adjustable selectivity. Our methodology encompasses design that leverages electron execute system’s...
Single wire explosions are widely used in understanding the early stages of z-pinch experiments. This paper presents a serial experiments conducted on pulse power generator with ∼1 kA peak current and ∼10 ns rising time Xi'an Jiao Tong University. Polyimide coated aluminum wires uncoated ones were tested under three different voltages to analyze effect insulating coating. Experimental results showed that coating can increase energy deposition 10%∼30% by delaying voltage collapse raising...
We consider a liquid meniscus inside wedge of included angle 2β that wets the solid walls with contact θ. The has convex interface satisfies π∕2<θ+β<π. capillary pressure gradient due to small disturbance location line moves fluid from neck region bulge region, causing instabilities. A dynamic contact-line condition is considered in which varies linearly slipping speed slope G:G=0 representing perfect slip and fixed angle. nonlinear thin film equation derived numerically solved...
Compressed ultrafast photography (CUP) is a high-speed imaging technique with frame rate of up to ten trillion frames per second (fps) and sequence depth hundreds frames. This powerful tool for investigating processes. However, since the reconstruction process an ill-posed problem, image will be more difficult increase number pixels each frame. Recently, various deep-learning-based regularization terms have been used improve quality CUP, but most them require extensive training are not...
In order to suppress the core-corona structures commonly observed in single-wire exploding stage of wire array Z-pinch, laser probe diagnostic is analyzed, and characteristics aluminum under negative-polarity fast-rising current pulses (90-170 A/ns) are investigated using a picosecond probe. The with diameter 15 μ m length 2 cm, has peak resistive voltage 35-50 kV resistivity 30-40 μΩ·cm before collapsed. ohmic energy deposited load 1.5-2.5 eV/atom at time, 2.5-4.0 time when Joule heating...
The compressed ultrafast photography (CUP) can capture non-repetitive time-evolving events at 7 × 1013 fps, which is anticipated to find a diverse range of applications in physics, biomedical imaging, and materials science. feasibility diagnosing phenomenon Z-pinch by using the CUP has been analyzed this article. Specifically, dual-channel design adopted for acquiring high quality reconstructed images strategies identical masks, uncorrelated complementary masks have compared. Furthermore,...
This paper presents experimental results on the effects of insulating coatings and current prepulse tungsten planar wire array Z-pinches ∼100 ns main facility. Optical framing images indicated that without a ablation process was asymmetrical implosion zippered. The x-ray peak power ∼320 GW. By using surface asymmetry remained, processes were delayed by ∼30 ns. burst narrow decreased to ∼200 When prepulses used both standard insulated arrays, symmetry improved (to ∼520 GW power). In addition,...
The electrical explosion of single wire occurs in many application fields, such as wire-array Z-pinch, synthesis the nanopowder, high-intensity magnetic field source, etc. initial stage has a critical influence on stagnation and X-ray yield Z-pinch. impressive result from Z-pinch is major motivation to promote research this field. Although numerous studies have been carried out gain deep insight into physics wire, more experimental investigations are necessary optimize energy deposition...
The planar wire array Z pinch experiments with insulated aluminum wires coated 2 μm polyimide were carried out on "QiangGuang-I" facility (100ns, 1.3 MA) and compared to those ordinary wires. Experimental results indicate that surface insulation can affect the implosion dynamics radiation character of pinches. resistive heating energy imploding mass may be increased by exploiting effect insulation. In surface-insulated multi-peak phenomena considerably suppressed, whereas improvement X-ray...
An all-optical framing camera has been developed which measures the spatial profile of photons flux by utilizing a laser beam to probe refractive index change in an indium phosphide semiconductor. This acquires two frames with time resolution about 1.5 ns and inter frame separation 13 angularly multiplexing on The this estimated be 140 μm spectral response also theoretically investigated 5 eV-100 KeV range. applied investigating imploding dynamics molybdenum planar wire array Z-pinch 1-MA...
Due to the absence of natural current zero-crossing point, dc interruption has been a critical issue in system. The schemes currently used are based on power electronics or precharged capacitors, leading high cost and complicated control strategy. In this article, passive oscillation load breaking scheme vacuum interrupter is proposed. external transverse magnetic field (ETMF) applied excite arc voltage. According spectrum analysis voltage, <italic...
Two dynamics modes, named short ablation mode and long mode, are observed in implosion experiments of planar wire array Z pinch on 'QiangGuang-I' facility utilizing an optical streak camera. The has a lagged trajectory compared with the mode. For shot 10035 initial time K-shell radiation is consistent interaction for plasma arriving at centre array, while 10038 about 10 ns earlier. In two partial could traverse plane then collide to form dense column diameter 2.2 mm 1.5 10038.
High time resolution detecting systems for MeV pulsed radiation are essential inertial confinement fusion diagnostics. Traditional detection of system is restricted by cable bandwidth. Based on recording excess carrier dynamics in semiconductors, a new mechanism, called RadOptic, was developed Lawrence Livermore National Laboratory (LLNL). The variation intensity with converted into the infrared laser probe using this mechanism. sensing material InGaAsP quantum wells severalmicrometer...
A laser shadowgraphy system was built based on a Nd:YAG backlight with half width of 9 ns and wavelength 532 nm. It has the capacity time resolution integration simultaneously during lighting by utilizing streak camera commercial digital as image recording devices. Experimental study insulated-ordinary mixed planar wire array Z pinches carried out Qiangguang-I facility. results indicate that expansion corona plasma insulated tungsten wires is slower than ordinary over ablation stage. Average...
Multiaxial neutron/x-ray imaging and three-dimensional (3D) reconstruction techniques play a crucial role in gaining valuable insights into the generation evolution mechanisms of pulsed radiation sources. Owing to short emission time (∼200 ns) drastic changes source, it is necessary acquire projection data within few nanoseconds order achieve clear computed tomography 3D imaging. As consequence, that can be used for image at certain moment are often available only angles. Traditional...
The experimental results of the insulated-standard hybrid wire array Z pinches carried out on “QiangGuang-I” facility at Northwest Institute Nuclear Technology were presented and discussed. surface insulating can impose a significant influence dynamics radiation characteristics pinches, especially early stage (t/timp &lt; 0.6). expansion insulated wires ablation is suppressed, while streams stripped from move faster than that standard wires. foot X-ray enhanced by increment number wires,...
This paper presents experimental results on the effects of insulating coatings tungsten planar wire array Z-pinches an 80 kA, 100 ns current facility. Expansion velocity is obviously increased from ∼0.25 km/s to ∼3.5 by using coatings. It can be inferred that cores are in gaseous state with this fast expansion velocity. An optical framing camera and laser probing images show standard arrays have typical ablation process which similar their behaviors mega-ampere facilities. The precursor...
The electromagnetic interference (EMI) around the devices for ionizing radiation experiments is a serious concern. In order to reduce EMI and enhance signal-to-noise ratio, new type of analog fiber optic link (FOL) has been developed fast pulse signal transmission under complicated fields. Electrical signals are converted optical through an electro-optical conversion process using amplitude modulation mechanism. After long-distance transmission, can also be restored via photoelectric...
The primary experiment results of imploding dynamics for single and double planar wire arrays, acquired by optical streak camera, are presented analyzed. show that the interaction adjacent plasma array is not dus entirely to inelastic collisions, while a part can move into center form precursor across plane array; current outer larger than interior wire, time ablation stage ~65% total time, only mass participates in stage.