A5051701696- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Dust and Plasma Wave Phenomena
- Plasma Diagnostics and Applications
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Atomic and Subatomic Physics Research
- Physics of Superconductivity and Magnetism
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Tropical and Extratropical Cyclones Research
- Superconducting and THz Device Technology
- Geophysics and Gravity Measurements
- Radiation Detection and Scintillator Technologies
- Galaxies: Formation, Evolution, Phenomena
- Laser-induced spectroscopy and plasma
- Cosmology and Gravitation Theories
- High-pressure geophysics and materials
Southwestern Institute of Physics
2015-2024
Nanjing University of Information Science and Technology
2024
Universidade de Santiago de Compostela
2024
Wuhan University of Science and Technology
2024
Central China Normal University
2024
Lawrence Berkeley National Laboratory
2024
North University of China
2024
Purple Mountain Observatory
2022-2023
Dalian University of Technology
1990-2023
Chinese Academy of Sciences
2009-2020
We advocate the possibility that (effective) cosmological constant \ensuremath{\Lambda} varies in time as ${R}^{\mathrm{\ensuremath{-}}2}$, R being scale factor of our expanding Universe. This behavior can be obtained under some simple and general assumptions conformity with quantum cosmology. After pointing out several advantages worth noticing, we show such a time-varying leads to no conflict existing observations. However, it does change predictions standard cosmology matter-dominated...
Matter evolved under the influence of gravity from minuscule density fluctuations. Nonperturbative structure formed hierarchically over all scales and developed non-Gaussian features in Universe, known as cosmic web. To fully understand formation Universe is one holy grails modern astrophysics. Astrophysicists survey large volumes use a ensemble computer simulations to compare with observed data extract full information our own Universe. However, evolve billions particles years, even...
ABSTRACT The ∼2 Myr old classical T Tauri star CI Tau shows periodic variability in its radial velocity (RV) variations measured at infrared (IR) and optical wavelengths. We find that these observations are consistent with a massive planet ∼9 day period orbit. These results based on 71 IR RV measurements of this system obtained over five years, 26 nine years. was also observed photometrically the 34 nights ∼one month 2012. data alone inadequate to identify an orbital period, likely result...
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 We report on comprehensive experimental studies of turbulence spreading in edge plasmas. These demonstrate the relation and entrainment to intermittent convective density fluctuation events or bursts (i.e. blobs holes). The non-diffusive character is thus elucidated. velocity (or mean jet velocity) manifests a linear correlation with skewness fluctuations, increases auto-correlation time fluctuations. Turbulence by positive fluctuations outward, while negative inward. degree...
A 2D electron cyclotron emission imaging (ECEI) system has been developed for measurement of temperature fluctuations in the HL-2A tokamak. It is comprised a front-end 24 channel heterodyne array with tunable RF range spanning 75-110 GHz, and set back-end ECEI electronics that together generate × 8 = 192 images 2nd harmonic X-mode from plasma. The simulated performance local oscillator (LO) optics radio frequency (RF) presented, laboratory characterization results. Gaussian beams LO are...
The frequency modulated continuous wave reflectometer was developed for the first time on HL-2A tokamak. system utilizes a voltage controlled oscillator and an active multiplier broadband coverage detects as heterodyne mode. Three reflectometers have been installed operated in extraordinary mode polarization to measure density profiles at low field side, covering Q-band (33-50 GHz), V-band (50-75 W-band (75-110 GHz). For profile reconstruction from phase shift of probing wave, corrected...
A novel 16-channel fixed frequency Doppler backward scattering (DBS) reflectometer system has been developed on the HL-2A tokamak. This is based filter-based feedback loop microwave source (FFLMS) technique, which lower phase noise and power variation compared with present tunable generation comb array techniques [J. C. Hillesheim et al. Rev. Sci. Instrum. 80, 083507 (2009) W. A. Peebles 81, 10D902 (2010)]. The DBS comprised of four × four-frequency transmitters direct quadrature...
The radial profiles of perpendicular flows in the presence magnetic island were firstly measured HL-2A tokamak by hopping work frequency Doppler backward scattering reflectometer system along with a two-dimensional electron cyclotron emission imaging diagnostic identifying locations. It has been observed that across O-point cut flow is quite small at center and strongly enhanced around boundary island, resulting large increase shear outer half while X-point almost flat whole region....
When analyzing a visualized network, users need to explore different sections of the network gain insight. However, effective exploration large networks is often challenge. While various tools are available for global and local features these usually require significant interaction activities, such as repetitive navigation actions follow nodes edges. In this paper, we propose structure-based suggestive approach support by suggesting appropriate structures upon user request. Encoding with...
We demonstrate theoretically that a toroidal Alfv\'en eigenmode (TAE) can parametrically decay into geodesic acoustic mode and kinetic TAE in plasma. The corresponding threshold condition for the amplitude is estimated to be $|\ensuremath{\delta}{B}_{\ensuremath{\perp}}/{B}_{0}|\ensuremath{\sim}O({10}^{\ensuremath{-}4})$. Here, $\ensuremath{\delta}{B}_{\ensuremath{\perp}}$ ${B}_{0}$ are, respectively, perturbed magnetic field of pump equilibrium field. This novel process, addition...
The mission of HL-2A is to explore the key physical topics relevant ITER and advanced tokamak operation (e.g. future HL-2M), such as access H-mode, energetic particle physics, edge-localized mode (ELM) mitigation/suppression disruption mitigation. Since 2016 Fusion Energy Conference, team has focused on investigations following areas: (i) pedestal dynamics L–H transition, (ii) techniques ELM control, (iii) turbulence transport, (iv) physics. results demonstrated that increase mean shear flow...
Abstract As a promising scenario for fusion reactors, the high poloidal-beta ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mi>β</mml:mi> <mml:mtext>P</mml:mtext> </mml:mrow> </mml:msub> </mml:math> ) is characterized by strong large radius internal transport barrier (ITB), which significantly enhances overall confinement quality and bootstrap current fraction fully non-inductive operation. It frequently observed that in presence of...
Abstract The alpha particle should have good confinement when there are instabilities and toroidal field ripple in fusion devices. With the slowing down distribution generated by TRANSP/NUBEAM, Alfven eigenfunction calculated NOVA/NOVA-K, a quasilinear model ORBIT code, study investigated nonlinear evolution of Toroidal Eigenmode (TAE) driven particles resulting transport, particularly focusing on synergistic effect with loss. amplitude level strong pulsations is about 5e-4R0 , frequency...
Abstract Abstract&#xD;In this paper, we introduce a novel X-point Slot Closure (XSC) divertor developed for the HL-3 tokamak. The XSC combines benefits of W-shaped, V-shaped, SAS (Small Angle Slot), and CRD (Compact Radiative Divertor) divertors into compact design that is compatible with high-elongation high-triangularity double-null configurations. This offers three key advantages. First, its structure, positioned near dome top, reduces volume while increasing overall plasma volume....
Abstract Fast ions in a tokamak device exhibit notable acceleration phenomenon during edge localized modes (ELMs). Presented here is an analytical analysis of the phase space transport fast induced by ELMs. Counter to previous simulations, it shown that ELMs can be inefficient accelerating case low frequency nature. Instead, characterized&#xD;by radial particle transport, as result exchange canonical toroidal angular momentum. The associated diffusivity found increase drastically for...
We perform a search of double beta decay $^{136}$Xe to the excited state, $0^+_1$, $^{136}$Ba (2$\nu \beta \beta$-0$_1^+$), using dual-phase xenon detector PandaX-4T with first 94.9-day commissioning data. The multi-site events are reconstructed up MeV energy scale, which helps improve background model significantly. contribution from stainless steel platform outside cryostat is evaluated for time. No significant evidence 2$\nu \beta$-0$_1^+$ observed, resulting in lower limit $T_{1/2}^{2...
Significant advancements have been made by Large Language Models (LLMs) in the domains of natural language understanding and automated content creation. However, they still face persistent problems, including substantial computational costs inadequate availability training data. The combination Federated Learning (FL) LLMs (federated LLMs) offers a solution leveraging distributed data while protecting privacy, which positions it as an ideal choice for sensitive domains. suffer from...
Abstract GNSS-LEO occultation detection is widely used in radio-sounding, climate research, and space exploration because of its global coverage high vertical resolution. The traditional event prediction method has the problem computational cost, while this study reduces computation time improves accuracy by adaptively adjusting step. Experimental results show that adaptive time-step algorithm significantly efficiency predicting events compared with Brute-force solution application different...
Abstract We present a comprehensive study of the multiple electrostatic and electromagnetic electron temperature gradient (ETG) modes with significant upgrading gyrokinetic code HD7. Specifically, non-adiabaticity all particle species effects are taken into account in upgraded version. Multiple ETG (ES-ETG) conventional unconventional ballooning mode structures found to be excited by large gradients. The mode-index l >0 (where represents peak number as well parity space) have comparable...
Abstract We review the physics of energetic particles (EPs) in magnetically confined burning fusion plasmas with focus on advances since last update ITER Physics Basis (Fasoli et al 2007 Nucl. Fusion 47 S264). Topics include basic EP physics, generation, diagnostics EPs and instabilities, interaction thermal plasma EP-driven particle modes (EPMs), turbulence, linear nonlinear stability simulation instabilities EPMs, 3D effects, scenario optimization strategies based phase-space control,...
Abstract We present a kinetic Clemmow-Mullay-Allis (CMA) diagram for thermal plasmas. Notable differences are observed between the cold and CMA diagrams. New boundaries found collisionless damped left- right-handed circularly polarized waves Langmuir waves, extraordinary-Bernstein mode conversion lines take place of lower upper hybrid resonant due to finite Larmor radius effect. The not only contributes basic understanding wave properties in plasmas, but also can provide powerful tool...