A5108614528- Combustion and flame dynamics
- Advanced DC-DC Converters
- Advanced Combustion Engine Technologies
- Solid State Laser Technologies
- Laser Material Processing Techniques
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Gyrotron and Vacuum Electronics Research
- Radiative Heat Transfer Studies
- Low-power high-performance VLSI design
- Magnetic confinement fusion research
- Analog and Mixed-Signal Circuit Design
- Integrated Circuits and Semiconductor Failure Analysis
- Pulsed Power Technology Applications
- Microwave Engineering and Waveguides
- Silicon Carbide Semiconductor Technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Energy Efficient Wireless Sensor Networks
- Multilevel Inverters and Converters
- Thin-Film Transistor Technologies
- Advanced Surface Polishing Techniques
- Ion-surface interactions and analysis
- Rocket and propulsion systems research
- Photonic Crystal and Fiber Optics
University Town of Shenzhen
2024
Tsinghua University
2012-2024
Tsinghua–Berkeley Shenzhen Institute
2024
Nanjing University of Aeronautics and Astronautics
2024
Chongqing University
2017
China Academy of Engineering Physics
2002-2016
National Taiwan University
2012-2015
Chinese Academy of Engineering
2003
Sichuan University
2000-2001
The evolution of beam phase space in ionization injection into plasma wakefields is studied using theory and particle-in-cell simulations. process involves both longitudinal transverse mixing, leading initially to a rapid emittance growth followed by oscillation, decay, slow saturation. An analytic for this presented verified through This includes the effects distance (time), acceleration distance, wakefield structure, nonlinear charge forces, it also shows how ultralow beams can be produced methods.
This brief proposes a voltage-mode pulse-width modulation (PWM) buck converter that can operate from 10 MHz to 30 with linear comparator-free voltage-to-duty-cycle (V2D) controller. The V2D controller replaces main comparator an inverter and uses ramp generator negative feedback, enlarge the switching frequency tunable duty cycle range which are limited by delay of comparators in conventional design. A high-slew-rate buffer used for variable starting point is presented. was fabricated 0.18...
An all solid state master-oscillator-power-amplifier laser system was experimentally investigated using a pulsed-diode-pumped single-longitudinal-mode Nd:YAG as master oscillator. The operated with 400 Hz pulse repetition rate. amplifiers contain pre-amplifier and power amplifier. A specially designed large aperture tapered fiber phase conjugation mirror used in the amplifier to improve beam quality. maximum energy of 101 mJ is obtained after double-pass amplification. duration less than 6...
Suppressing higher mode excitation is very important in the high gain relativistic klystron amplifier because can seriously degrade performance and cause pulse shortening. The mechanism of self-excitation explored PIC simulation, it shown coupling between cavities main self-excitation. forms positive feedback loop for to be excited just like that oscillator circuit. formula startup current developed based on cavities. And corresponding methods are taken avoid Finally, control realized RKA...
We demonstrated a quasi-continuous wave (QCW) Nd:YAG planar waveguide laser amplifier with the single pulse output energy of 944 mJ. At repetition frequency (PRF) 100 Hz, 1064 nm seed was coupled into 128 mJ and duration 192 μs. With total pump 1582 mJ, extracted 816 obtained, leading to an optical efficiency 52% electrical 28%. To best our knowledge, it is up now highest in reported. maximum output, beam quality factors M2 were measured be 3.44 4.81 guided direction unguided respectively,...
Through-silicon vias (TSVs) are thought to be the essential process of next-generation packaging technologies such as three-dimensional integrated circuit, system in package and wafer-level packaging. This Letter investigated formation quality deep TSVs using green nanosecond laser drilling process. Moreover, a wet chemical etching (WCE) was employed improve sidewall fabricated ns pulses. Experimental results show that TSV roughness can markedly reduced, from micrometre nanometre scale. The...
ABSTRACT In advanced processes, single‐inductor multiple‐output (SIMO) DC‐DC converters with battery voltage as input face serious overvoltage problems due to low MOSFET withstand voltage. To meet the needs of SIMO converter design in this paper first proposes a an adaptive power supply buffer (APSB) and voltage‐limiting techniques 22‐nm CMOS. The proposed APSB technology ensures that driving stage remains unchanged under changing supply, solving breakdown problem caused by simplifying...
In intermediate cavities of a relativistic klystron amplifier (RKA) driven by intense electron beam, the equivalent circuit model, which is widely adopted to investigate interaction between bunched beam and cavity in conventional design, invalid due high gap voltage nonlinear loading RKA. According Maxwell equations Lorentz equation, self-consistent for beam-wave are introduced study Based on equations, effects modulation depth frequency amplitude its phase obtained. It shown that...
A scalable design for diode-pumped 10 kW solid-state laser systems is presented. The system composed of Nd: YAG discs arranged along a folded unstable resonator axis. efficiency, required pumping power, output power are estimated.
Aiming at the long time consumption in feature description，a points description algorithm based on weighted neighbor contribution and multi-resolution fusion is involved. First, of sampling point's neighbors introduced to design Weighted Neighbor Contribution Center-Symmetric Local Binary Pattern (WNCCS-LBP) descriptor strategy. Then, a Multi-resolution Fusion Pattern(MFCS-LBP) constructed by combining WNCCS-LBP CS-LBP strategy.Experimental results demonstrate that proposed significantly...