A5039476766- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Pulsed Power Technology Applications
- Plasma Diagnostics and Applications
- High-pressure geophysics and materials
- Geophysics and Gravity Measurements
- Ocean Waves and Remote Sensing
- GNSS positioning and interference
- Magnetic confinement fusion research
- Coastal and Marine Dynamics
- Gyrotron and Vacuum Electronics Research
- High-Velocity Impact and Material Behavior
- E-commerce and Technology Innovations
- Water Quality Monitoring and Analysis
- Complex Network Analysis Techniques
- Radiation Detection and Scintillator Technologies
- Infrared Target Detection Methodologies
- Optical Systems and Laser Technology
- Solid State Laser Technologies
- Intellectual Property and Patents
- Advanced X-ray Imaging Techniques
- Target Tracking and Data Fusion in Sensor Networks
- Particle accelerators and beam dynamics
Ministry of Natural Resources
2023-2025
National Satellite Ocean Application Service
2023-2025
China Academy of Engineering Physics
2000-2018
Shanghai Jiao Tong University
2016-2018
Fudan University
2018
Japan Atomic Energy Agency
2007
Kansai Photon Science Institute
2007
Tsinghua University
2007
Institute of Applied Physics and Computational Mathematics
2001
Cornell University
1986-1987
We have measured the electric field in high-voltage gap of a magnetically insulated intense-ion-beam diode by observation Stark shift line emission from ions accelerating gap. The distribution as function distance anode plasma has been compared with theoretical model and is not consistent well confined electron sheath near cathode. Furthermore, very rapid closure at early time pulse was clearly observed.
An experiment for studying laser self-guiding has been carried out the high power ultrashort pulse interaction with an underdense plasma slab. Formation of extremely long channel and its bending are observed when is much higher than critical relativistic self-focusing. The formation accompanied by electron acceleration a low transverse emittance electric current. Particle-in-cell simulations show that occurs accelerated electrons overtake modify refractive index in region front pulse.
Abstract We present the temporal and spatial characterization of X-ray sources (at ~1 keV) driven by a 200 TW, 30 fs, 800 nm laser pulse on SILEX-I facility at Research Center Laser Fusion. For copper foil interaction with intensity between 6 × 10 18 W/cm 2 3 19 , images show cone-like jet structures. While yield X-rays is strongly dependent intensity, plasma expansion length weakly open angle not correlated to intensity. The formation structure attributed transverse confine self-induced...
We have measured the electric field distribution across high-voltage gap of a magnetically insulated intense ion beam diode by observing Stark shift line emission from ions accelerating in gap. The yielded time dependence actual observed rapid closure early resulting expansion electric-field-excluding electrode plasmas diode. This can contribute substantially to previously ion-current-density enhancements over values calculated based upon mechanical Assuming planar geometry was used...
Based on chirped pulse amplification technology, we have built a Ti:sapphire laser system, called SILEX-I (superintense for experiments extremes), at CAEP, which consists of three stages with 5-, 30-, and 300-TW outputs, respectively. The first the second work 10 Hz, while third works single shot. Pulse durations 30 fs been obtained by installing an acousto-optic programmable dispersive filter (AOPDF) to compensate spectral gain narrowing in regen. By taking number advanced measures spatial...
The Haiyang-2D (HY2D) satellite is the fourth ocean dynamics environment monitoring launched by China. operates on a re-entry frozen orbit, which necessitates orbital maneuvers to maintain its designated path once satellite’s sub-satellite point deviates beyond certain threshold. However, execution of orbit presents significant challenge field Precise Orbit Determination (POD). thesis selects on-board GPS data HY2D in December 2023 and five maneuvering days that year. Employing multifaceted...
High-power solid-state laser programs at China Academy of Engineering Physics have made great progresses in recent years. A three-stage Ti:sapphire system, SILEX-I, was completed early 2004 which could deliver 26-fs pulses 5TW, 30TW, and 300TW to the corresponding target chambers for diverse applications. SILEX-I has been working very stably since its completion experiments, demonstrating that it is most powerful femtosecond exploring strong-field phenomena world. The SG-III Nd:glass...
An ultrafast quenched plastic scintillation detector was used to measure the fusion fuel ion temperature at low implosion (DT) neutron yield (5×108–3×109) in initial experiment performed Shenguang II laser facility. The typical temperatures of exploding pusher targets for direct drive were around 4 keV and uncertainties ±15–23%. detection efficiency DT neutrons calibrated a K-400 accelerator. time response function system by from DT-filled capsule, which can be regarded as δ pulsed source...
Backward Raman amplification was observed in a 0.7 mm-long high-density gas jet plasma. The 800 nm 30 fs seed pulse amplified by factor ∼28, with an output energy of 2.8 mJ. spectra showed that the waveband around significantly amplified. experimental result demonstrated resonant can be realized plasma against strong instability.
Laser technology developments, including construction of a 286-TW Ti:Sapphire laser with focused intensity 10 21 W/cm 2 , installation the TIL, prototype SG-III, and operation SG-II are presented. Results experiments on hohlraum physics, indirect-drive implosion, Thomson scattering, EOS, X-ray briefly introduced. Simulations code package, LARED, for target physics outlined.
We have measured the distributions of ion transverse velocities in acceleration gap a magnetically insulated diode. The measurement is based on observing spectral profile Doppler-broadened spontaneous line emission from accelerating ions. velocity C++ and Al++ ions were peaked at zero symmetric with respect to directions parallel antiparallel magnetic-field lines. mean for both species corresponded energies about 200 eV experiments potential difference 260–330 kV. divergence angles observed...
Short laser pulse can be amplified and compressed via strongly coupled stimulated Brillouin scattering (sc-SBS) in plasma. But the sc-SBS amplification is subject to various deleterious instabilities. Here, we present specific analyses on forward Raman (FRS) of seed pulse. FRS grows from noises depletes energy. It causes strong modulations decoherence, which terminate amplification. The theoretical model with investigated. Then, examine suppression effects density gradient random...
In this paper, a matching method for altimeter and transponder signals in Sub-optimal Maximum Likelihood Estimate (SMLE) tracking mode is proposed. the in-orbit calibration of SMLE using reconstructive transponder, it necessary to separate forwarding signal from ground echo signal. At same time, fluctuations received altimeter, which are caused by can be eliminated. The generates bias when measuring arrival time transmitting embeds both transponder-recorded data altimeter-recorded data....
Volume 23, Number 2, Pages 205–209, 2005Below is the complete Reference citation for Neumayer et al. (2005).Neumayer, P., Bock, R., Borneis, S., Brambrink, E., Brand, H., Caird, J., Campbell, E.M., Gaul, Goette, Haefner, C., Hahn, T., Heuck, H.M., Hoffmann, D.H.H., Javorkova, D., Kluge, H.-J., Kuehl, Th., Kunzer, Merz, Onkels, Perry, M.D., Reemts, Roth, M., Samek, Schaumann, G., Schrader, F., Seelig, W., Tauschwitz, A., Thiel, Ursescu, Wiewior, Wittrock, U. & Zielbauer, B. (2005). Status...
Experiments for the laser guiding studies has been carried out with 30-fs 100-TW Ti:sapphire pulse interaction underdense plasma produced by a long-slab (1.2 times 10 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) gas jet and an ablative laser-triggered discharged capillary. Formation of extremely long channel length (~10 mm) above Rayleigh is observed when power much higher than critical relativistic self-focusing. The...
Relativistic mono‐energetic electron beams have been demonstrated by worldwide laser‐plasma accelerator experiments in the range of a few tens TW. Laser‐plasma experiment has carried out with 200TW, 30fs Ti:Sapphire laser pulses focused on helium gas‐jets F/8.7 optics. Intense produced energy 30 to 150 MeV controlling plasma length and density precisely. Images Thomson scattering fluorescence side from indicate highly relativistic effects such as long self‐channeling filamentation well...
Interaction of TW-ps laser with plasma results in a skin layer mechanism for nonlinear (ponderomotive) force driven two dimensional blocks (pistons) if very high contrast ratio is provided suppression relativistic self-focusing. This Skin acceleration (SLA) [1] space charge neutral ion current densities larger than 10<sup>10</sup> Amp/cm<sup>2</sup> [1-3]. Using Ions the MeV range 1000 times higher proton or DT [3] fast igniter [4] using and may result better conditions this ignitor scheme....
SWIM can provide global wave spectra, but under small sea conditions, the presence of parasitic peaks at low wavenumber, surfboard effects, and residual speckle noise lead to performance degradation height spectrum products. To reduce impacts factors above on spectrum, in this paper, a convolution neural network (CNN) method based BU-Net is proposed for calibrating omnidirectional spectra with buoy measurements states (wind mainly/swell mainly) surface conditions speed from 9m/s 19m/s,...