Research

Research of plasma physics in DUT

The plasma physics in DUT has won good reputation worldwide in the research subareas¾low pressure rf plasmas, atmospheric pressure plasmas, magnetically confined plasmas, plasma-material interactions, plasma-technology applications, etc.¾  by having done many excellent research works and published a large number of high-quality papers in journals such as Nature Physics, Physical Review Letters, Applied Physics Letters, Plasma Source Science and Technology, and Physics of Plasmas. It has been bestowed a number of Provincial and Ministerial Level Awards on its achievements.

The plasma physics in DUT has undertaken many important national research projects, e.g., the National Key Basic Research Program of China, Special Program for Important National Science and Technology, the National Magnetic Confinement Fusion Science Program, the State Key Program of National Natural Science Foundation of China, etc., with annual income of research funding up to 10 million CNY.

There are now 17 professors, 11 associate professors, and 7 lecturers in the plasma physics, DUT, of which one was awarded "Yangtze river scholar"; one, "Liaoning province discipline talent"; three, "the new century talents by Ministry of Education" ; one,  "specially invited professor". For more information, please visit the staff page.

 

· Physics of Low Pressure Radio-Frequency Plasmas: 

For better utilization of plasma processing in the industries of semi-conductor chip and solar cell, the discharge characteristics of low pressure radio frequency (RF) plasma sources are investigated. The research activities include the self consistent simulations of multi physics field coupling mechanism occurring in the plasma and the relevant experimental diagnostics. Three types of RF discharge reactors are established, i.e., large-area very high frequency capacitively coupled plasma, dual frequency capacitively coupled plasma and inductively coupled plasma. Proprietary intellectual property code, i.e., multi-physics analysis for plasma sources (MAPs), is developed. By using the model and the experiment tool, specific physics processes, such as discharge mode transition, stand-wave effects and collision-less electron resonant heating mechanism etc, are examined.

· Physics of Atmospheric Pressure Plasmas

The main research fields are atmospheric pressure direct current, mid-frequency, radiofrequency, microwave and nanosecond pulsed discharge plasmas. The physics study includes discharge mode transformation, discharge instability, the effect of strong magnetic field, and the coupling mechanism of plasma with the aerodynamics. The applications of the plasma sources are surface treatment, airflow control, plasma biologic and medicine.

·Magnetic Confinement Plasma Physics

For better understanding of the experimental observations in the magnetic confinement Tokamak devices, large scale numerical simulations on the core and edge plasma instabilities are conducted. The research interests involve macro-scale magnetohydrodynamics instability, micro-scale turbulence instability, as well as multiple scales interaction. The numerical and theoretical results are in agreement with the experimental observation and hence can provide a deep understanding in the underlying processes for experiments.

·Physics of Edge Plasma in Tokamak

The major effort of studying the edge plasma, the interface between the core plasma and plasma-facing components (PFCs), is to find a solution for Plasma Surface Interaction (PSI) in future fusion devices such as ITER. Using simulation methods, edge plasma group works mainly on the PSI-related issues, such as diverter plasma and scrape-off layer (SOL) plasma, plasma detachment, plasma transport, fuel retention, erosion and deposition of plasma facing materials, and impurity transport. Apart from developing PSI-related codes of its own, such as EPPIC, HIIPC, and SURO, it also employs world-widely used codes such as SOLPS, ERO and BOUT++ to study common and specific issues of different fusion devices. In addition, another effort of the edge plasma group, integrating its own developed codes with famous fluid model codes, is under way.

·Experiments and diagnosis of plasma-wall interactions in Tokamak

The main focus is laser induced breakdown spectroscopy (LIBS),for diagnosing the plasmas wall interaction, which is one of the major issues in the magnetic confined nuclear fusion device (Tokamak). One bigchallenge of LIBS is the extreme discharge condition, i.e., very low pressureand meanwhile very strong magnetic field inTokamak such as EAST. The studies involve two-dimensional deep analysis of multilayered plasma facing component (PFC) in theTokamak environment. Moreover, the linear correlation approach is applied for improving the accuracy of depth profile analysis and identifying the interface boundary absolutelybetween the deposition layer and the substrate, for the first time. This would help us to develop LIBS technique to monitor the fuel retention and impurity deposition on the first wall of EAST.

· Applications of Plasma Technologies

 The orientation is aimed at environmental, energy and chemical applications of low-temperature plasmas. The research interest focuses on (1) plasma catalysis for removing gaseous pollutants, (2) plasma reforming of biogas, natural gas and greenhouse gas, and (3) atmospheric pressure plasma chemical vapor deposition for synthesizing nano-TiO2photocatalyst. Especially, a novel technology of VOCs, by combining a cycled storage-discharge (CSD) plasma catalytic method and a featured spark-shade plasma reactor, is invented and used for biogas pollutants removal.

lPlasma Diagnoses and Low Temperature Plasma Sources

 The main focus is the development of novel EM diagnostic methods and utilization of micro/nano second imaging to characterize various discharge processes. Especially, the optimization of various low temperature plasma sources are conducted, i.e., nano-second pulsed discharge under water discharge, pulsed RF atmospheric pressure glow discharge, ultra-low pressure larger-area uniform RF inductively coupled plasma, and industrial-scale uniform VHF.