A5045429306- Pulsed Power Technology Applications
- Plasma Diagnostics and Applications
- Electrostatic Discharge in Electronics
- Plasma Applications and Diagnostics
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- Microbial Inactivation Methods
- Particle accelerators and beam dynamics
- Electrohydrodynamics and Fluid Dynamics
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Silicon Carbide Semiconductor Technologies
- Laser Design and Applications
- Electromagnetic Launch and Propulsion Technology
- Aerosol Filtration and Electrostatic Precipitation
- Diamond and Carbon-based Materials Research
- Atomic and Molecular Physics
- Quantum chaos and dynamical systems
- Integrated Circuits and Semiconductor Failure Analysis
- Surface Modification and Superhydrophobicity
- Cold Atom Physics and Bose-Einstein Condensates
- Laser-induced spectroscopy and plasma
- Physics of Superconductivity and Magnetism
- Water Quality Monitoring and Analysis
University of Science and Technology of China
2025
Suzhou Institute of Biomedical Engineering and Technology
2022-2024
Chinese Academy of Sciences
1999-2024
Southwestern Institute of Physics
2010-2023
University of Shanghai for Science and Technology
2014-2022
CEA Cadarache
2020
Southwest Jiaotong University
2020
Yes Technologies (United States)
2019
Leibniz Institute for Plasma Science and Technology
2017
Jilin University
2016
Marx generators are widely used to produce transient high-voltage pulses. The evolution of semiconductor devices and power electronics concepts promotes the development solid-state (SSMGs) enables them with flexible pulse modulation ability. First, this article sorts out SSMGs topologies chronologically. We can see that how energy efficiency is considerably improved by replacing resistors diodes switches square-wave pulses generated based on half-bridge structures. Unipolar bipolar be easily...
Abstract Since the last IAEA Fusion Energy Conference in 2018, significant progress of experimental program HL-2A has been achieved on developing advanced plasma physics, edge localized mode (ELM) control physics and technology. Optimization confinement performed. In particular, high- β N H-mode plasmas exhibiting an internal transport barrier have obtained (normalized pressure reached up to 3). Injection impurity improved confinement. ELM using resonance magnetic perturbation or injection a...
Abstract Density profiles in the pedestal region (H-mode) are measured HL-2A and characteristics of density described. Cold particle deposition by supersonic molecular beam injection (SMBI) within is verified. Edge-localized mode (ELM) mitigation SMBI into H-mode demonstrated relevant physics elucidated. The sensitivity effect to pressure duration studied. Following SMBI, ELM frequency increases amplitude decreases for a finite duration. Increases <?CDATA $f_{{\rm ELM}}^{{\rm SMBI}} /f_{{\rm...
Typical ELMy H-mode discharges have been achieved on the HL-2A tokamak with combined auxiliary heating of NBI and ECRH. The minimum power required is about 1.1 MW at a density 1.6 × 1019 m−3 increases decrease in density, almost independent launching order ECRH heating. energy loss by each edge localized mode (ELM) burst estimated to be lower than 3% total stored energy. At frequency typically 400 Hz, confinement time only marginally reduced ELMs. supersonic molecular beam injection fuelling...
Low-temperature plasma with reactive species including the hydroxyl radical is found very effective for degradation of many pharmaceuticals and macromolecular organic matter in wastewater. The most efficient way to excite directly wastewater using high-voltage sub-microsecond pulses which prevents corona discharges developing into arc discharges. Recently, generated only several hundred nanosecond durations has been be especially efficient. Therefore, an all solid-state pulse generator...
In recent years, all solid-state Marx generators have been found more and extensive applications in industrial, environmental, biological fields. All many requirements for their drive circuits, such as good synchrony driving signals at different stages, fine isolation between control the main adjustable pulsewidths frequencies, abilities. This paper proposes a high-performance circuit 24-stage generator based on IGBTs. A half-bridge using IR2110 outputs high-current turning-on signal...
This paper presents the design for a novel all solid-state sub-microsecond pulse generator dielectric barrier discharges (DBDs). consists of MARX generator, Blumlein transmission lines (BTLs) and one magnetic switch (MS). As power supply, is capable outputting nanosecond-pulses with voltage peak up to 20 KV. The key elements are BTLs which charged by generator. Due unmatched impedance DBD load, energy stored in begins oscillate through load after MS turns on. violent oscillation lasts until...
In this paper, an overview of the magnetohydrodynamic instabilities induced by energetic electrons on HL-2A is given and some new phenomena with high-power electron cyclotron resonance heating (ECRH) are presented. A toroidal Alfvén eigenmode frequency from 200 to 350 kHz identified during powerful ECRH. lower range 10 35 kHz, which in beta-induced range, coexistence multi-mode found ECRH for first time. The spectra become wide when power sufficiently high. frequencies modes increase much...
Dielectric barrier discharge (DBD) can produce a large amount of active particles and has many applications in the industry. In order to study effect different rising edges, falling waveform voltages on DBD, novel all-solid-state bipolar multilevel high-voltage pulse generator is proposed. Compared with other topologies, proposed system achieve more levels waveforms fewer switches. This article introduces structure working principle detail. Through PSPICE simulation, it found that...
Abstract Most reactors for non‐thermal plasma excitation are capacitive to pulse generators. The density and temperature of electrons in dominated by the discharging currents which proportional edges. However, adjusting edges is quite challenging since switching speed inductance capacitance loops dominate them. This study proposes a drive circuit solid‐state Marx generators with adjustable controls Miller plateau gate voltage amplitude adjust both rise time fall pulses continuously...
Abstract The evolutions of MHD instability behaviors and enhancement both electrostatic electromagnetic turbulence towards the plasma disruption have been clearly observed in HL-2A plasmas. Two types disruptive discharges investigated for similar equilibrium parameters: one with a distinct stage small central temperature collapse ( $$\sim$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>∼</mml:mo> </mml:math> 5–10%) around 1 millisecond before thermal quench (TQ), while...
An all solid-state Marx modulator utilizing Insulated Gate Bipolar Translators (IGBTs) is capable of outputting pulses with variable pulse width, repetitive frequency and varying voltage amplitude. But the relatively slow turn-on speed IGBT high current loads result in rise time output pulses. If a magnetic switch (MS) combined an Marx, it will be quite simple to obtain nanosecond times under 100 ns. In this paper, several topologies for pulsed generators are proposed based on solidstate MS....
Melatonin exerts a range of physiological effects. However, the functional significance melatonin in spermatogenesis and underlying mechanisms remain unclear. MicroRNAs (miRNAs) are essential initiation progression testicular development, including spermatogenesis. Thus far, limited information is known about role miRNAs melatonin-mediated In this study, expression levels miRNA machinery genes, namely, Dgcr8and Xpo5,were significantly increased by melatonin. The profile was identified testes...
In recent years, semiconductor switches have been widely used in pulse generators. order to generate bipolar or rectangular pulses, these generators operate different time sequences. However, the dv/dt induces false triggering of that leads local short circuits. Breakdown load will also produce a high short-circuit current which affect switches' reliability and lifetime. this paper, new gate drive circuit is proposed protect from currents. A 52-stage solid state Marx generator using was...
Avalanche transistors have been widely used in nanosecond pulse generators because of high switching speed, low jitter, small size, intrinsic inductance, and high-frequency operation. Marx circuits based on cascaded switches are often to increase the voltage amplitude. In this paper, some current-limiting resistors traditional were replaced by diodes speed up charging reduce energy loss, repetitive frequency. The influence capacitance current limiting resistor output amplitude frequency...
Edge localized mode (ELM) mitigation with lower hybrid current drive (LHCD) has been observed in the HL-2A tokamak. This effect is very sensitive to parameters as plasma density and LHCD absorbed power, i.e., more easily be for high large power. The divertor peak heat load released by ELM significantly reduced during phase. pedestal gradient slightly mitigation, rotation velocity ion temperature are LHCD. It found that not synchronized LHCD, while it increase of turbulence, showing...
Recent studies have shown that rectangular high-voltage pulses a high-performance in dielectric barrier discharges (DBDs). To generate the used Marx generators, most common way is driving two sets of switches synchronously with different sequence. Because fast-changing current and voltage, electromagnetic interference (EMI) will affect circuit. Therefore, if groups were triggered mistakenly at same time, it would cause partial short-circuit phenomenon. In this paper, new circuit overcurrent...
An all solid-state high-voltage rectangular pulse generator is proposed in this paper. This broadly consists of a Marx generator, forming line (PFL) and magnetic switch (MS). As the power supply, discharges to PFL through an inductor. The inductor should cooperate with MS since it influences discharging process directly determines volt-second product pre-pulse over load. saturates at exactly moment ends. Then matched resistor load saturated high voltage obtained design are introduced...
Non-thermal plasma excited by pulsed strong electric fields can generate a large number of oxidants in water such as ozone, hydrogen peroxide and hydroxyl radicals. These active species play an important role on treatment. In this paper, treatment processing system was constructed means dielectric barrier discharge with stream well mixed air. Coaxial structure adopted the reactor. The downward upward air flow up were mixed. Degradation indigo carmine solution attempted system. effects time,...
In recent years, semiconductor switches have gradually replaced traditional gas due to their long lifetime and smaller volume. However, the rated current of limits applications all-solid-state pulsed power generators. Usually, multiple or pulse generators are required in parallel share a large case enormous applications. this article, new high-current generator based on Marx connected was proposed. One group used control charging The driving circuits can be simplified fewer switches. It also...
For the first time, edge-localized mode (ELM)-free H-mode was realized in HL-2A tokamak by using electron cyclotron resonance heating and co-current neutral beam injection (NBI) heating. This ELM-free is associated with formation of edge particle transport barrier, an increase density peaking a significant decrease turbulence. During stationary phase, magnetohydrodynamic identified, which has similar characteristics to harmonic oscillation (EHO), as observed other tokamaks. EHO-like enhances...
Bipolar junction transistors (BJTs) have been widely studied and used in nanosecond high-voltage pulse generators due to the advantages of fast switching speed high repetitive frequency. Usually Marx-type circuit is raise peak value output pulses. In this paper, a traditional BJT-Marx using charging resistors analyzed theoretically experimentally. Based on results, structure changed decrease isolation voltage across resistors, diodes are replace block capacitors discharging resistors....