A5006992662- Magnetic confinement fusion research
- Electric Motor Design and Analysis
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Electromagnetic Launch and Propulsion Technology
- Magnetic Bearings and Levitation Dynamics
- Fusion materials and technologies
- Induction Heating and Inverter Technology
- Laser-Plasma Interactions and Diagnostics
- Magnetic Properties and Applications
- Hepatocellular Carcinoma Treatment and Prognosis
- Pancreatic and Hepatic Oncology Research
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Solar and Space Plasma Dynamics
- Theoretical and Computational Physics
- Anorectal Disease Treatments and Outcomes
- Colorectal Cancer Surgical Treatments
- Geomagnetism and Paleomagnetism Studies
- Aortic aneurysm repair treatments
- Traffic and Road Safety
- Impact of Light on Environment and Health
- Electric Power Systems and Control
- Laser-induced spectroscopy and plasma
- Advanced Frequency and Time Standards
Nanjing University of Science and Technology
2020-2024
Southeast University
2022-2023
Chinese Academy of Sciences
2001-2023
Harbin Institute of Technology
2015-2018
Pennsylvania State University
2017
Millennium Engineering and Integration (United States)
2017
Institute of Plasma Physics
1994-2014
The University of Texas at Austin
1985
China Fusion Engineering Test Reactor (CFETR) is a tokamak reactor; one design option under the consideration of National Integration Design Group employs superconducting magnets. The fusion power at range 50–200 MW and duty cycle (or burning time) was envisioned as 30%–50%. plasma current will be 10 MA major minor radii are 5.7 1.6 m, respectively. concept engineering including magnet system, vacuum vessel (VV) maintenance method has been carried out in past years. toroidal magnetic field...
Bolt loosening is a common mechanical failure in large-scale generator sets, especially the top cover bolts, which can lead to unstable operation, affecting safety and efficiency of unit. Real-time monitoring bolt pre-tightening force early diagnosis are crucial for ensuring long-term safe operation set. This study proposes novel method diagnosing faults hydraulic units, with particular focus on thread failures. The proposed approach utilizes stress feature analysis intelligent algorithms...
A new technique for wall conditioning that will be especially useful future larger superconducting tokamaks, such as ITER, has been successfully developed and encouraging results have obtained. Solid carborane powder, which is non-toxic non-explosive, was used. Pulsed RF plasma produced by a non-Faraday shielding antenna with power of 10 kW. The ion temperature about 2 keV toroidal magnetic field 1.8 T pressure 3 × 10-1 Pa. Energetic ions broke up the molecules, resulting boron struck were...
This paper investigates the choice of pole spacer materials for a high-speed surface-mounted PMSM based on temperature rise and thermal stress. For rotor without copper shield, influences losses, rise, stress are analyzed. After that, rules selecting concluded. with effects shield's positions thickness losses studied. Then variation shield is described. Finally, compared choosing summarized.
Abstract Computed tomography-guided radiofrequency ablation (CT-RFA) and laparoscopic RFA (L-RFA) have been used to treat intrahepatic recurrent small hepatocellular carcinoma (HCC) against the diaphragmatic dome. However, therapeutic safety, efficacy, hospital fee never compared between two techniques due scarcity of cases. In this retrospective study, 116 patients were divided into groups with a total 151 local HCC lesions abutting diaphragm. We overall survival (OS), tumor progression...
The experimental advanced superconducting tokamak (EAST) is a tokamak, which successfully achieved the first plasma discharge in 2006. major radius of EAST 1.9 m, and its central magnet field 3.5 T. In past few years, has made many achievements, such as 60-s double-null divertor configuration 1-MA plasma. 2012, 411-s long-pulse with 0.28-MA current 32-s H-mode operation was at seventh campaign. addition, various means for mitigating ELMs have also been demonstrated to facilitate operation....
The Ergodic Magnetic Layer Experiment on ohmically heated Text demonstrates that a small resonant helical field (m/n = 7/2 or 7/3) with fractional amplitude r/BT of about 10−3 creates stable ergodic magnetic layer and substantially modifies the boundary heat flow. Field line tracings accurately map observed perturbed limiter load patterns. level intrinsic impurities is reduced, consistent lower edge electron temperature, as measured by cyclotron emission detector.
Ion Bernstein wave (IBW) heating has been investigated in the HT-7 superconducting tokamak. Electron mode was concentrated on deuterium plasma with an injecting power to 320 kW. The bulk electron temperature showed a significant rise factor, ΔTe×ne/PRF, up 9.4 eV×1013 cm-3 kW-1. direct via Landau damping from IBW demonstrated after intensive RF wall conditioning. Both on-axis and off-axis were obtained. profile modified by under different conditions. Edge density no sharp drop during...
The density profiles were measured in the Hefei tokamak-7 (HT-7) [World Survey of Activities Controlled Fusion Research, Nuclear Special Supplement (International Atomic Energy Agency, Vienna, 1997), p. 61] ohmic discharges by means a new multichannel far-infrared (FIR) laser interferometer. progress on extension HT-7 discharge operation region was introduced. experiment results at limit, multifaceted asymmetric radiation from edge (MARFE) phenomena, rf (radio frequency) boronization...
Due to the merit of very‐short end turns, Gramme‐ring windings are widely used in high‐speed permanent‐magnet motors (HSPMMs). This study investigated thermal issues a 300 kW, 12,000 rpm Gramme‐ring‐winding HPSMM with housing water jacket and forced air cooling, based on computational fluid dynamics (CFD) numerical heat‐transfer calculations. The reasons that cause overheat prototype experimental test thoroughly analysed. high wind resistance gap as ventilation duct large interface between...
A multichannel far-infrared (FIR) hydrogen cyanide (HCN) laser interferometer was developed to measure plasma electron density profile on the HT-6M tokamak. The structure of seven-channel FIR is described. source used in a continuous-wave glow discharge HCN with cavity length 3.4 m and power output about 100 mW at 337 μm. detection sensitivity 1/15 fringe temporal resolution 0.1 ms. Experimental results were measured by edge Ohmic heating, pumping limiter, ion cyclotron resonant heating...
This paper provides stress analytical models for a variable-speed simplified rotor of the surface-mounted permanent magnet synchronous motor (PMSM). The impact developed by alternator discharge on prime was analyzed. Parameters, such as interference fits between sleeve and magnets, core shaft, thickness, heating have significant influences design shock-resistance rotor. Then distribution actual verified 3-D finite element analysis model, critical speed integrated computed.
The configuration of conventional high-speed Permanent Magnet Synchronous Motors (PMSMs) is usually long and thin, with overlong axial end winding lengths, which not suitable for those applications that place severe restrictions on the length, such as pulsed alternators. This paper first studied key design aspects a flat-structure PMSM. toroidal-windings, low-conductivity material retaining sleeve, large airgap segmentation magnets were to reduce length motor. division stator employment...
The Experimental Advanced Superconducting Tokamak (EAST) is a superconducting tokamak, which successfully achieved the first plasma discharging in 2006. major radius of EAST 1.9m, and its central magnet filed 3.5T. In past few years, has made many achievements such as 60s double-null divertor configuration 1MA plasma. 2012, 411s long-pulse with 0.28MA current 32s H-mode operation were at seventh campaign. addition, new cycle state fast response sawtooth ICRF power modulation observed....
The conventional lap-winding high-speed permanent-magnet synchronous machine (HSPMSM) usually has a large interturn short-circuit (ITSC) current, seriously threatening the reliability. This article founds that SC coil of gramme-ring-winding HSPMSM is wound around stator yoke, so inductance considerable and thus will cause great reduction ITSC current. types faults were first analyzed for multistrand-gramme-ring-winding HSPMSM, then, characteristics influencing factors investigated based on...
The first plasma discharges were successfully achieved on the experimental advanced superconducting tokamak (EAST) in 2006. sawteeth behaviours observed by means of soft x-ray diagnostics and ECE signals EAST. displacement radius q = 1 surface was studied compared with result equilibrium calculation. density sawtooth oscillation also HCN laser interferometer diagnostics. structure EAST operational region detail. Plasma performance obviously improved boronization wall conditioning. It that...
In order to make the pulsed power system for electromagnetic launchers compact and reduce volume weight, a permanent magnet synchronous motor (PMSM) with toroidal windings was designed in this paper. Due existence of teeth slots at outside edge stator, flux lines distribute nonuniformly leakage increases. The stator divided into two parts effects different nonmagnetic materials as part on performance were studied. Moreover, their influences temperature rise compared. Based aforementioned...
High power density and high efficiency are the key requirements to be met for high-speed motor of fuel cell air compressor application. This paper presents a slotless toroidal-winding permanent-magnet synchronous (HSPMSM) with nonmagnetic fillers in stator. The structure toroidal windings non-magnetic was selected limit high-frequency rotor eddy-current loss, iron losses, torque ripple, while improving fixation heat transmission. basic topology selection is first introduced. Then...
Stationary multifaceted asymmetric radiation from the edge (MARFE) is studied by gas-puffing feedback control according to an empirical MARFE critical density ( approximately 1.8 x 10(13) cm(-3)) in HT-7 Ohmic discharges (where plasma current I(p) about 170 kA, loop voltage V(loop)=2-3 V, toroidal field B(T)=1.9 T, and Z(eff)=3-4). It observed that improved confinement mode characterized D(alpha) line emissions drops line-averaged increase triggered stationary discharges. The not a symmetric...
A new boronization technique focusing on the needs of future large superconducting device has been developed in HT-7 tokamak. The first try a tokamak gave very promising results. fine homogeneous and hard a-B/C:H film was produced by pulse ion cyclotron resonance frequency plasma. shows high adhesion, thickness longer lifetime. ratio B/C is about 3 up to depth 280 nm. X-ray photoelectron spectroscopy analysis that B–B, B–C, C–C, C–O, B–O bonds were formed during boronization. oxygen content...
The heating problem is a major concern for the design of high-speed permanent magnet motor (HSPMM). This paper first analyzed copper loss litz wires slotless gramme-ring-winding HSPMM with gramme-ring windings, combining analytical and finite-element methods. Then computational fluid dynamics model was established thermal analysis. Through calculation temperature field, strand number cross-section shapes were finally optimized to pursue minimum rise motor, methods DOE second-order response...