A5027765367- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Laser-Plasma Interactions and Diagnostics
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Nuclear reactor physics and engineering
- Physics of Superconductivity and Magnetism
- Neutrino Physics Research
- Particle Detector Development and Performance
- Plasma Diagnostics and Applications
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Radiation Therapy and Dosimetry
- Spacecraft and Cryogenic Technologies
- Electrostatics and Colloid Interactions
- Solidification and crystal growth phenomena
- Safety and Risk Management
- Halal products and consumer behavior
Chinese Academy of Sciences
2016-2025
Hefei Institutes of Physical Science
2021-2025
Peking University
2019-2024
Sichuan University
2021-2024
Institute of Plasma Physics
2014-2023
Chang'an University
2021
Tibet University
2020
Southwest Jiaotong University
2020
National Natural Science Foundation of China
2020
University of Chinese Academy of Sciences
2019
Abstract The formation of a static 3-Dimensional (3D) helically localized perturbation structure the Toroidal Alfv'en Eigenmode (TAE) is observed for first time under magnetic islands induced by Resonant Magnetic Perturbations (RMP) in tokamak plasmas. Before application RMP, TAE around 200 kHz excited Electron Cyclotron Resonance Heating (ECRH) Energetic Electrons (EEs). After n = 1 mode into helical area on flux surface, where toroidal number. We find strengthened near X points m/n=-3/1...
An x-ray imaging diagnostic system using the Timepix3 detector has recently been developed and installed on Experimental Advanced Superconducting Tokamak (EAST). The measures temporal evolution, spatial distribution, energy spectrum of signals during plasma discharge with a 16° diagonal field view, resolution 4 mm, broad spectral-energy response range (5–200 keV). Equipped event-driven capability, captures coordinates, energy, arrival time each photon event 1.56 ns. Herein, performances were...
A detailed analysis of the spectra synchrotron radiation emitted by runaway electrons, and an spot shapes are presented for EAST cases. Conditions required asymptotic expressions to be valid studied these parameters. We provide correct in typical discharges, we show results calculations shape spots electrons. These detected a visible light camera EAST. Safety factor q(r), horizontal displacement electron drift surfaces with respect magnetic δe, pitch angle θp, position were taken into...
Neutron diagnostics have become a significant means to study energetic particles in high power auxiliary heating plasmas on the Experimental Advanced Superconducting Tokamak (EAST). Several kinds of neutron diagnostic systems been implemented for time-resolved measurements D-D flux, fluctuation, emission profile, and spectrum. All detectors calibrated laboratory, situ calibration using 252Cf source EAST is preparation. A new technology digitized pulse signal processing adopted wide dynamic...
In the EAST tokamak, asymmetrical ring-like runaway electron beams with energy more than 30 MeV and pitch angle about 0.1 were investigated. Those carried 46% of plasma current located around q = 2 rational surface when m/n 1/1 2/1 MHD modes existed in plasma. changed from a hollow to filled structure during slow oscillations discharge every 0.2 s, which correlated large step-like jump cyclotron emission (ECE) signals, big spike-like perturbation Mirnov signals decrease energy. Between those...
A toroidal Alfvén eigenmode (TAE) excited by barely trapped energetic electrons during the application of a static magnetic perturbations (MPs) is observed for first time in tokamak ohmic heating plasmas. This TAE appears when current n = 2 MPs exceeds threshold value, at which forced reconnection happens. Here, mode number. located near plasma edge, agrees with calculation gap. It propagates ion diamagnetic direction and has dominant number 2. The frequency consistent precessional energy...
The paper describes a new compact neutron spectrometer optimized for the detection of 2.5 MeV neutrons fusion plasma applications. first spectroscopy measurements on nuclear experiment (EAST) with this detector are also reported together data interpretation. allowed separating different emission components from and to validate effectiveness Neutral Beam Injection (NBI) heating. A possible improvement diagnostic has been identified in order increase sensitivity weak spectrum, such as those...
Pressure gradient driven m = 1 internal kink mode destabilization that follows an L-H transition is observed in the operational region of EAST tokamak, which manifests periodic oscillations soft x-ray (SXR) and Mirnov coil signals. Using tomography with high resolution detection array, we find rotation direction 1/1 ion diamagnetic drift poloidal cross-section. A large displacement hot core attributable to shift mode. In contrast stationary fixed frequency, various frequency chirping...
Beta-induced Alfv?n eigenmodes (BAEs) during strong tearing modes are investigated on the EAST tokamak systematically, and relation between BAE frequencies plasma parameters such as electron density , ion temperature Ti, profile of safety factor q(?) or intensity (the width magnetic island w) is given in detail injection power lower hybrid wave (LHW) (or also accompanied by cyclotron resonance frequency) comprehensively. All conditions show that values agreement with generalized...
The runaway electrons produced during spontaneous disruptions were studied when lower hybrid wave heating was used in the EAST tokamak. Up to of pre-disruptive plasma current can be transferred seed fast exist plasma. evolutions radial profile electric field and electron density are obtained with aid an one-dimensional self-consistent simulation model. results clearly show competition between diffusion induced growth current. They also indicate that dominant generation mechanism Dreicer...
In a lower hybrid current drive experiment on the EAST tokamak in spring of 2010, process which fast electrons transform into runaway was observed, and way waves (LHWs) affect behavior studied. It found that when power LHWs is below certain threshold, excited by can be accelerated to due primary generation mechanism electrons, but high enough, cannot anymore. No matter how was, production secondary mechanisms suppressed.
Two different threshold electric fields, characterizing a lower field required for significant seed RE generation and sustainment higher the avalanche onset, have been experimentally observed in flattop of EAST discharges. These results demonstrate that onset is 1.2-fold than detection primary generation. An updated 0-D model, including delay suggests population should be less previous prediction. The also opens possibility suppression at relatively low electron density.
Runaway currents have been detected during unintended disruptions in the circular plasma with limiter configuration Experimental Advanced Superconducting Tokamak (EAST). The runaway electron (RE) plateau can carry up to 80% of pre-disruption current. highest correspond lowest loop voltage, which is contrary observations made most tokamaks. This anomalous behavior attributed acceleration pre-existing wave resonant suprathermal electrons by lower hybrid waves disruption decay phase. Two...
We report in this paper the study towards revealing energy distribution of lost high-energy runaway electrons based on their bremsstrahlung emission. The hard x-rays are originated from emission experimental advanced superconducting tokamak (EAST) tokamak, and spectra measured using a gamma spectrometer. is reconstructed x-ray spectrum deconvolution algorithm. results indicate that can be obtained with approach. In specific case paper, electron was peaked around 8 MeV, covering 6 MeV to 14 MeV.
A new gamma ray spectrometer with high energy and time resolutions has been developed installed on the EAST tokamak to study fast ion runaway electron behaviors. The is based a LaBr3(Ce) scintillator detector fully digital data acquisition system that digitizer pulse processing algorithms. resolution of about 3.9% at 662 keV, can operate stably counting rate as 1 MHz, monitored by using light emitting diode monitoring system. measured spectrum simulated Geant4 unfolded high-resolution...
Ion cyclotron radio frequency (ICRF) wave heating is a primary method to heat ions in the Experimental Advanced Superconducting Tokamak (EAST). Through neutron diagnostics, effective ion was observed hydrogenminority (MH) scenarios. At present, investigation of deuterium–deuterium (DD) fusion neutrons mostly based on time-resolved flux monitor and spectrometer measurements. When ICRF applied, intensity became one order higher. The H/H + D ratio range 5–10%, corresponding hydrogen MH...
The nature of runaway electrons is such that the confinement and dynamics can be strongly affected by magnetic fluctuations in plasma. Experimental results HT-7 tokamak indicated significant losses due to fluctuations, but loss processes did not only rely on fluctuation amplitude. Efficient radial transport required there were no more than small regions plasma volume which was very low runaways. A diffusion coefficient Dr≈10 m2s-1 derived for processes, near resonant surfaces shielding...
Due to significant radiation hardness, thermal properties, low sensitivity gamma rays, and fast response, the 4H-SiC detector exhibits promising properties in measuring neutron production high-power fusion devices. To demonstrate potential value of detectors as a flux monitor spectrometer on experimentally advanced superconducting tokamak (EAST) during 2021 EAST deuterium–deuterium plasma experimental campaigns, covered with 25- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Abstract Experimental research on the electron cyclotron wave (ECW) pre-ionization and assisted start-up was carried out systematically for first time in EAST tokamak, which is a superconducting device with ITER-like full metal wall. Breakdown plasma initiation at low toroidal electric fields (<0.3 V m −1 ) ECW startup assistance has been demonstrated. Also, parameter domain of breakdown significantly extended towards higher prefill gas pressure. The effect injection timing, power, angle...
Abstract We report in this paper the development of single crystal diamond detector as a fast neutron spectroscopy EAST tokamak. The is used to detect directly without any converter during deuterium-deuterium fusion experiment, then energy spectrum reconstructed from recorded continuous scattered by using deconvolution algorithm. results indicate capability which can be monitor flux and