A5075343476- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Quantum Chromodynamics and Particle Interactions
- Nuclear reactor physics and engineering
- Physics of Superconductivity and Magnetism
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- Fusion materials and technologies
- Nuclear physics research studies
- Nuclear Engineering Thermal-Hydraulics
- Gyrotron and Vacuum Electronics Research
- Particle physics theoretical and experimental studies
- Control Systems and Identification
- Sparse and Compressive Sensing Techniques
- Scoliosis diagnosis and treatment
- Magneto-Optical Properties and Applications
- Misinformation and Its Impacts
- Anomaly Detection Techniques and Applications
- Laser Design and Applications
- Social Media and Politics
- Solar and Space Plasma Dynamics
- Rare-earth and actinide compounds
- Media Influence and Politics
Dartmouth College
2025
Chinese Academy of Sciences
2014-2024
Zhejiang University of Science and Technology
2024
Guangzhou Sport University
2024
Hefei Institutes of Physical Science
2018-2024
Central South University
2023-2024
China University of Mining and Technology
2024
Institute of Plasma Physics
2013-2023
Yale University
2007
A multichannel far-infrared laser-based POlarimeter-INTerferometer (POINT) system utilizing the three-wave technique is under development for current density and electron profile measurements in EAST tokamak. Novel molybdenum retro-reflectors are mounted inside wall double-pass optical arrangement. Digital Phase Detector with 250 kHz bandwidth, which will provide real-time Faraday rotation angle phase shift output, have been developed use on POINT system. Initial calibration indicates...
In this study, a long short-term memory (LSTM) model is trained on large disruption warning database to predict the EAST tokomak. To compare performance of proposed with previously reported full convolutional neural network (CNN) (Guo et al 2020 Plasma Phys. Control. Fusion 63 025008), same data set and diagnostic signals are used. Based test set, area under receiver operating characteristic curve, i.e. AUC value LSTM obtained as 0.87, true positive rate (TPR) sim87.5%, while false (FPR)...
Deuterium high-confinement (H-mode) plasmas, lasting up to 3.45 s, have been generated in the EAST by ion cyclotron range of frequency (ICRF) heating. H-mode access was achieved coating molybdenum-tiled first wall with lithium reduce hydrogen recycling from wall. plasmas plasma currents between 0.4 and 0.6 MA axial toroidal magnetic fields 1.85 1.95 T were 27 MHz ICRF heating deuterium minority. The input power required 1.6–1.8 MW. line-averaged density (1.83–2.3) × 1019 m−3. 200–500 Hz...
Abstract A real-time disruption predictor using random forest was developed for high-density disruptions and used in the plasma control system (PCS) of EAST tokamak first time. The via (DPRF) ran piggyback mode actively exploited dedicated experiments during 2019–2020 experimental campaign to test its predictive capabilities oncoming disruptions. During experiments, mitigation triggered by a preset alarm provided DPRF neon gas injected into successfully mitigate damage. DPRF’s average...
A double-pass, radially-viewing, multichannel far-infrared (FIR) polarimeter/interferometer system is under development for current density profile and electron measurements in the EAST tokamak. The utilizes three 432.5 μm CW formic acid FIR lasers pumped by CO2 lasers. Each of can generate high output power more than 30 mW per cavity. Two lasers, with slight frequency offset ( ∼ 1 MHz), will be made collinear counter-rotating circular polarization order to determine Faraday effect measuring...
Abstract In this study, a full convolutional neural network is trained on large database of experimental EAST data to classify disruptive discharges and distinguish them from non-disruptive discharges. The contains 14 diagnostic parameters the ∼10 4 (disruptive non-disruptive). test set 417 999 discharges, which are used evaluate performance model. results reveal that true positive (TP) rate ∼ 0.827, while false (FP) ∼0.067. This indicates 72 67 misclassified in set. FPs investigated detail...
State media outlets spread propaganda disguised as news online, prompting social platforms to attach state-affiliated tags their accounts. Do these reduce belief in state misinformation? Previous studies suggest the misperceptions but focus on Russia, and current research does not compare with other interventions. Contrary expectations, a preregistered U.S. experiment found no effect of Twitter-style false claims, seemingly because they were rarely noticed. By contrast, fact-check labels...
To prepare for steady-state operation of future fusion reactors (e.g. the International Thermonuclear Experimental Reactor and China Fusion Engineering Test (CFETR)), experiments on DIII-D have extended high poloidal beta (βP) scenario to reactor-relevant edge safety factor q95 ∼ 6.0, while maintaining a large-radius internal transport barrier (ITB) using negative magnetic shear. Excellent energy confinement quality (H98y2 > 1.5) is sustained at normalized (βN 3.5). This high-performance ITB...
Abstract Combining the strengths of model-based iterative algorithms and data-driven deep learning solutions, unrolling networks (DuNets) have become a popular tool to solve inverse imaging problems. Although DuNets been successfully applied many linear problems, their performance tends be impaired by nonlinear Inspired momentum acceleration techniques that are often used in optimization algorithms, we propose recurrent (RMA) framework uses long short-term memory neural network (LSTM-RNN)...
A multi-channel far-infrared laser-based POlarimeter-INTerferometer (POINT) system utilizing the three-wave technique has been implemented for fully diagnosing internal magnetic field in EAST tokamak. Double-pass, horizontal, radially-viewing chords access plasma via an equatorial port. The laser source consists of three CW formic acid (HCOOH) FIR lasers at nominal wavelength 432.5 μm which are optically pumped by independent infrared CO2 lasers. Output power is more than 30 mW per cavity....
On DIII-D, the high scenario has an internal transport barrier (ITB), , and very normalized confinement . Recently, plasmas starting with these conditions have been dynamically driven to where we find ITB performance persist for five energy times. These are projected meet ITER steady-state goal of Q = 5. The is maintained at lower a strong reverse shear, consistent predictions that negative central shear can threshold ITB. There two observed states in scenario: H-mode state edge pedestal,...
A long-pulse high confinement plasma regime known as H-mode is achieved in the Experimental Advanced Superconducting Tokamak (EAST) with a record duration over 30 s, sustained by Lower Hybrid wave Current Drive (LHCD) advanced lithium wall conditioning and divertor pumping. This characterized co-existence of small Magneto-Hydrodynamic (MHD) instability, i.e., Edge Localized Modes (ELMs) continuous quasi-coherent MHD mode at edge. We find that LHCD provides an intrinsic boundary control for...
A 28~GHz system with a high-power gyrotron tube has been used for the QUEST spherical tokamak to form an over-dense plasma electron Bernstein wave heating (EBWH) and current drive 8.2~GHz-wave. Non-inductive high-density ramp-up experiments dual-frequency (dual$-f$) cyclotron (EC) [ 8.2~GHz ] waves were conducted. spontaneous density jump (SDJ) state was observed as bifurcation phenomenon in dual$-f$ experiment. The on 8.2~GHz-wave non-inductively ramped up 25~kA, maintained 0.4~s under...
Experimental and modeling investigations on the Advanced Superconducting Tokamak (EAST) show attractive confinement stability properties in fully non-inductive, high poloidal beta plasmas. In 2018 EAST experimental campaign, extended operation regimes of steady-state scenario were obtained (βP ~ 1.9 & βN 1.5 H98y 2 1.3 using only RF heating) with a bootstrap current fraction (f BS 47%) ne/nGW 70%. The quality, 1.3, is much better than standard H-mode, stationary peaked electron temperature...
Abstract Theory-based integrated modeling is validated against high-performance steady-state core plasmas on EAST in the high poloidal beta ( β p ) regime with only RF heating. Reasonably good agreement between results and experimental measurements obtained not for temperature profiles but also 11-chord line-integrated densities Faraday angles first time. This validation effort demonstrates that safety factor can be non-reversed experiments EAST. The inaccessibility LH waves observed...
Drug-induced liver injury (DILI) is a significant cause of drug failure and withdrawal due to damage. Accurate prediction hepatotoxic compounds crucial for safe development. Several DILI models have been published, but they are built on different data sets, making it difficult compare model performance. Moreover, most existing based molecular fingerprints or descriptors, neglecting geometric properties lacking interpretability. To address these limitations, we developed GeoDILI, an...
Abstract Spontaneous mitigation of giant ELMs and appearance grassy have been observed repeatedly at low pedestal collisionality ( <?CDATA ${\nu }_{\mathrm{e},\mathrm{p}\mathrm{e}\mathrm{d}}^{{\ast}}\sim 0.15$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mi>ν</mml:mi> </mml:mrow> <mml:mi mathvariant="normal">e</mml:mi> <mml:mo>,</mml:mo> mathvariant="normal">p</mml:mi> mathvariant="normal">d</mml:mi>...
The auxiliary heating power absorption of 2.45 GHz and 4.6 lower hybrid (LH) waves in EAST is analysed order to improve the determination energy confinement time. LH coefficient obtained by using time derivative total stored including plasma kinetic poloidal magnetic field energy. Results on have shown that, for both frequencies, fraction absorbed bulk decreases with increase density, decrease toroidal field. Scaling laws density dependence at different fields frequencies been statistically...
Dedicated experiments focusing on the influence of lower hybrid waves (LHWs) edge-localized modes (ELMs) were first performed during 2012 experimental campaign EAST, via modulating input power LHWs in high-confinement-mode (H-mode) plasma mainly sustained by ion cyclotron resonant heating. Natural ELMs are effectively mitigated (ELM frequency increases, while its intensity decreases dramatically) as LHW is applied, observed over a fairly wide range current or edge safety factor. By scanning...
Abstract To sustain good lower hybrid wave (LHW)–plasma coupling for long-pulse plasma operation, the first time, feedback control is designed and realized in EAST using a proportion integration differentiation method by choosing reflection coefficient (RC) of LHW power as reference gas-puffing feedback, including one pulse test multi-pulse experiments. Experiments show that such can work correctly maintains LHW–plasma effectively long suggesting possibility application on plasma....
The presence of frozen clay as a natural protective material makes it crucial layer defense against potential impacts in various engineering projects. Studying the strength and deformation characteristics is, therefore, particularly important. In this study, static mechanical tests, Hopkinson impact test, fly-plate tests were conducted on to identify its properties under an load. uniaxial compression strength, flexural elastic modulus displayed linear increase with change temperature....
Abstract Significant improvement of plasma performance in high-confinement mode (H-mode) discharges with favourable toroidal field B t , i.e. the ion ∇ drift towards primary X-point, has been widely observed EAST tokamak pure radio-frequency heating contrast to that unfavourable . Statistical analysis indicates higher core electron temperature, similar temperature and relatively steeper pedestal density compared The is mainly contributed by increase Further much lower recycling scrape-off...
Abstract This paper presents the first results of a passive active multijunction (PAM) launcher at 2.45 GHz during lower hybrid current drive (LHCD) experiments on EAST. Good coupling performance with power reflection coefficient ( RC ) ∼3% has been achieved plasma–antenna distance up to ∼11 cm in L-mode edge plasmas without local gas puffing near PAM launcher. Reliable this perturbations induced by type I localized modes (ELMs) successfully demonstrated. Compared old full (FAM) launcher,...
A novel equilibrium fitting method, which combining the polarimeter/interferometer (POINT) measurements with external magnetic measurements, has been developed to improve accuracy of safety factor (q) profile on EAST tokamak. The POINT system, measuring accurate line-integrated electron density and Faraday rotation angle, provides field information inside plasma. By adding these data constraints, results new method show clear difference initial becomes larger gradually from boundary core...