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Observation of Doppler shift modulated by the internal kink mode using conventional reflectometry in the EAST tokamak Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-03-01 Gongshun LI, Tao ZHANG, Kangning GENG, Fei WEN, Kaixuan YE, Liqing XU, Xiang ZHU, Xuexi ZHANG, Fubin ZHONG, Zhen ZHOU, Shuqi YANG, Ziqiang ZHOU, Lin YU, Ting LAN, Shouxin WANG, Ang TI, Shoubiao ZHANG, Haiqing LIU, Guoqiang LI, Xiang GAO, the EAST Team
In this paper we present a new experimental observation using a conventional reflectometry technique, poloidal correlation reflectometry (PCR), in the Experimental Advanced Superconducting Tokamak (EAST). The turbulence spectrum detected by the PCR system exhibits an asymmetry and induced Doppler shift during the internal kink mode (IKM) rotation phase. This Doppler shift is the target measurement
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The research progress of an E//B neutral particle analyzer Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-03-01 Long MA, Yufan QU, Yuan LUO, Dehao XIE, Yanxi WANG, Shuo WANG, Guofeng QU, Peipei REN, Xiaobing LUO, Xingquan LIU, Jifeng HAN, Roy WADA, Weiping LIN, Linge ZANG, Jingjun ZHU
An // neutral particle analyzer (NPA) has been designed and is under development at Sichuan University and Southwestern Institute of Physics. The main purpose of the // NPA is to measure the distribution function of fast ions in the HL-2A/3 tokamak. The // NPA contains three main units, i.e. the stripping unit, the analyzing unit and the detection unit. A gas stripping chamber was adopted as the stripping
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Inward particle transport driven by biased endplate in a cylindrical magnetized plasma Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-03-01 Yue GE, Tianchao XU, Chijie XIAO, Zhibin GUO, Xiaogang WANG, Renchuan HE, Xiaoyi YANG, Zuyu ZHANG, Ruixin YUAN
The inward particle transport is associated with the formation of peaked density profiles, which contributes to improve the fusion rate and the realization of steady-state discharge. The active control of inward particle transport is considered as one of the most critical issues of magnetic confinement fusion. Recently, it is realized preliminarily by adding a biased endplate in the Peking University
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Polarimeter–interferometer diagnostic using terahertz solid-state sources for fluctuation measurements on Keda Torus eXperiment (KTX) Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-03-01 Xingkang WANG, Wenzhe MAO, Jinlin XIE, Tao LAN, Hong LI, Adi LIU, Chu ZHOU, Xiaohui WEN, Zian WEI, Jie WU, Chen CHEN, Dongkuan LIU, Xianhao RAO, Hu CAI, Jiaren WU, Peng DENG, Haiqing LIU, Weixing DING, Ge ZHUANG, Wandong LIU
A multi-channel polarimeter–interferometer has been developed on the Keda Torus eXperiment (KTX) for the study of equilibrium dynamics and internal magnetic fluctuations. A three-wave technique based on terahertz solid-state sources (~650 GHz) is applied for simultaneous measurements of electron density and Faraday rotation angle. The output power of the microwave source is 2 mW. Faraday rotation effect
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Electron density measurement by the three boundary channels of HCOOH laser interferometer on the HL-3 tokamak Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-03-01 Junren MOU, Yonggao LI, Yuan LI, Zaihong WANG, Baogang DING, Haoxi WANG, Jiang YI, Zhongbing SHI
Far-infrared (FIR) interferometer is widely used to measure the electron density in the magnetically confined fusion plasma devices. A new FIR laser interferometer with a total of 13 channels (8 horizontal channels and 5 oblique channels) is under development on the HL-3 tokamak by using the formic-acid laser (HCOOH, f = 694 GHz). In order to investigate the boundary electron density activity during
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The characteristics of negative corona discharge and radio interference at different altitudes based on coaxial wire–cylinder gap Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Wangling HE, Hongyu WEI, Yinlu ZHANG, Yongcong LIU, Yunpeng LIU, Baoquan WAN, Yang ZHOU, Yanzhao WANG, Zheyuan GAN
The corona discharge from transmission lines in high-altitude areas is more severe than at lower altitudes. The radio interference caused thereby is a key factor to be considered when designing transmission lines. To study the influence of altitude on negative corona characteristics, an experimental platform comprising a movable small corona cage was established: experiments were conducted at four
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Simulation of ion cyclotron wave heating in the EXL-50U spherical tokamak based on dispersion relations Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Haojie MA, Huasheng XIE, Bo LI
This study investigates the single-pass absorption (SPA) of ion cyclotron range of frequency (ICRF) heating in hydrogen plasma of the EXL-50U spherical tokamak, which is an upgraded EXL-50 device with a central solenoid and a stronger magnetic field. The reliability of the kinetic dispersion equation is confirmed by the one-dimensional full-wave code, and the applicability of Porkolab's simplified
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Experimental study on the effect of H2O and O2 on the degradation of SF6 by pulsed dielectric barrier discharge Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Yalong LI, Kun WAN, Yufei WANG, Xiaoxing ZHANG, Zhaodi YANG, Mingli FU, Ran ZHUO, Dibo WANG
SF6 has excellent insulation performance and arc extinguishing ability, and is widely used in the power industry. However, its global warming potential is about 23,500 times that of CO2, it can exist stably in the atmosphere, it is not easily degradable and is of great potential harm to the environment. Based on pulsed dielectric barrier discharge plasma technology, the effects of H2O and O2 on the
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Detection of Al, Mg, Ca, and Zn in copper slag by LIBS combined with calibration curve and PLSR methods Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Junwei JIA, Zhifeng LIU, Congyuan PAN, Huaqin XUE
The precise measurement of Al, Mg, Ca, and Zn composition in copper slag is crucial for effective process control of copper pyrometallurgy. In this study, a remote laser-induced breakdown spectroscopy (LIBS) system was utilized for the spectral analysis of copper slag samples at a distance of 2.5 m. The composition of copper slag was then analyzed using both the calibration curve (CC) method and the
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Non-thermal atmospheric-pressure positive pulsating corona discharge in degradation of textile dye Reactive Blue 19 enhanced by Bi2O3 catalyst Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Milica PETROVIĆ, Dragan RADIVOJEVIĆ, Saša RANČEV, Nena VELINOV, Miloš KOSTIĆ, Danijela BOJIĆ, Aleksandar BOJIĆ
In this work, monoclinic Bi2O3 was applied for the first time, to the best of our knowledge, as a catalyst in the process of dye degradation by a non-thermal atmospheric-pressure positive pulsating corona discharge. The research focused on the interaction of the plasma-generated species and the catalyst, as well as the role of the catalyst in the degradation process. Plasma decomposition of the anthraquinone
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Characteristics of laser-induced breakdown spectroscopy of liquid slag Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Changyan DONG, Hongxia YU, Lanxiang SUN, Yang LI, Xiuye LIU, Ping ZHOU, Shaowen HUANG
Rapid online analysis of liquid slag is essential for optimizing the quality and energy efficiency of steel production. To investigate the key factors that affect the online measurement of refined slag using laser-induced breakdown spectroscopy (LIBS), this study examined the effects of slag composition and temperature on the intensity and stability of the LIBS spectra. The experimental temperature
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Phase field model for electric-thermal coupled discharge breakdown of polyimide nanocomposites under high frequency electrical stress Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Zhiyun HAN, Qingmin LI, Junke LI, Mengxi WANG, Hanwen REN, Liang ZOU
In contrast to conventional transformers, power electronic transformers, as an integral component of new energy power system, are often subjected to high-frequency and transient electrical stresses, leading to heightened concerns regarding insulation failures. Meanwhile, the underlying mechanism behind discharge breakdown failure and nanofiller enhancement under high-frequency electrical stress remains
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Spatial and temporal evolution of electromagnetic pulses from solid target irradiated with multi-hundred-terawatt laser pulse inside target chamber Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Qiangyou HE, Zhigang DENG, Zhimeng ZHANG, Yadong XIA, Bo ZHANG, Lingbiao MENG, Shukai HE, Hua HUANG, Lei YANG, Hongjie LIU, Wei FAN, Chen LIN, Weimin ZHOU, Tingshuai LI, Xueqing YAN
Giant electromagnetic pulses (EMPs) induced by high-power laser irradiating solid targets interfere with various experimental diagnoses and even damage equipment, so unveiling the evolution of EMPs inside the laser chamber is crucial for designing effective EMP shielding. In this work, the transmission characteristics of EMPs as a function of distances from the target chamber center (TCC) are studied
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Multi-layer phenomena in petawatt laser-driven acceleration of heavy ions Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Wanqing SU, Xiguang CAO, Chunwang MA, Yuting WANG, Guoqiang ZHANG
Laser-accelerated high-flux-intensity heavy-ion beams are important for new types of accelerators. A particle-in-cell program (Smilei) is employed to simulate the entire process of Station of Extreme Light (SEL) 100 PW laser-accelerated heavy particles using different nanoscale short targets with a thickness of 100 nm Cr, Fe, Ag, Ta, Au, Pb, Th and U, as well as 200 nm thick Al and Ca. An obvious stratification
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Characteristics of the SOL ion-to-electron temperature ratio on the J-TEXT tokamak with different plasma configurations Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Cunkai LI, Yunfeng LIANG, Zhonghe JIANG, Song ZHOU, Jiankun HUA, Jie YANG, Qinghu YANG, Alexander KNIEPS, Philipp DREWS, Xin XU, Feiyue MAO, Wei XIE, Yutong YANG, Jinlong GUO, Yangbo LI, Zhengkang REN, Zhipeng CHEN, Nengchao WANG, the J-TEXT Team
Accurate measurement of the average plasma parameters in the edge region, including the temperature and density of electrons and ions, is critical for understanding the characteristics of the scrape-off layer (SOL) and divertor plasma transport in magnetically confined fusion research. On the J-TEXT tokamak, a multi-channel retarding field analyzer (RFA) probe has been developed to study average plasma
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Final results of the first phase of the PROTO-SPHERA experiment: obtainment of the full current stable screw pinch and first evidences of the jet + torus combined plasma configuration Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Paolo MICOZZI, Franco ALLADIO, Alessandro MANCUSO, Vincenzo ZANZA, Gerarda APRUZZESE, Francesca BOMBARDA, Luca BONCAGNI, Paolo BURATTI, Francesco FILIPPI, Giuseppe GALATOLA TEKA, Francesco GIAMMANCO, Edmondo GIOVANNOZZI, Andrea GROSSO, Matteo IAFRATI, Alessandro LAMPASI, Violeta LAZIC, Simone MAGAGNINO, Simone MANNORI, Paolo MARSILI, Valerio PIERGOTTI, Giuliano ROCCHI, Alessandro SIBIO, Benedetto TILIA
In astrophysics, the boundary conditions for plasma phenomena are provided by nature and the astronomer faces the problem of understanding them from a variety of observations [Hester J J et al 1996 Astrophys. J. 456 225], on the other hand, in laboratory plasma experiments the electromagnetic boundary conditions become a major problem in the set-up of the machine that produces the plasma, an issue
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Airfoil friction drag reduction based on grid-type and super-dense array plasma actuators Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Ziqi FANG, Haohua ZONG, Yun WU, Hua LIANG, Zhi SU
To improve the cruise flight performance of aircraft, two new configurations of plasma actuators (grid-type and super-dense array) were investigated to reduce the turbulent skin friction drag of a low-speed airfoil. The induced jet characteristics of the two actuators in quiescent air were diagnosed with high-speed particle image velocimetry (PIV), and their drag reduction efficiencies were examined
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Development of Dα band symmetrical visible optical diagnostic for boundary reconstruction on EAST tokamak Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Ming CHEN, Biao SHEN, Shinichiro KADO, Bihao GUO, Dalong CHEN, Furui CAI, Bingjia XIAO
To investigate the potential of utilizing visible spectral imaging for controlling the plasma boundary shape during stable operation of plasma in future tokamak, a Dα band symmetric visible light diagnostic system was designed and implemented on the Experimental Advanced Superconducting Tokamak (EAST). This system leverages two symmetric optics for joint plasma imaging. The optical system exhibits
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Numerical analysis for the free-boundary current reversal equilibrium in the AC plasma current operation in a tokamak Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Yemin HU, Liuqing WANG, Shuhang BAI, Zhi YU, Tianyang XIA
In recent decades, tokamak discharges with zero total toroidal current have been reported in tokamak experiments, and this is one of the key problems in alternating current (AC) operations. An efficient free-boundary equilibrium code is developed to investigate such advanced tokamak discharges with current reversal equilibrium configuration. The calculation results show that the reversal current equilibrium
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Effect of ion stress on properties of magnetized plasma sheath Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-02-01 Long CHEN, Zuojun CUI, Weifu GAO, Ping DUAN, Zichen KAN, Congqi TAN, Junyu CHEN (陈俊宇)
In the plasma sheath, there is a significant gradient in ion velocity, resulting in strong stress on ions treated as a fluid. This aspect has often been neglected in previous sheath studies. This study is based on the Braginskii plasma transport theory and establishes a 1D3V sheath fluid model that takes into account the ion stress effect. Under the assumption that ions undergo both electric and diamagnetic
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Laser-induced plasma formation in water with up to 400 mJ double-pulse LIBS Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-01-01 Marion HENKEL, Michelle SIEMENS, Ralf METHLING, Benjamin EMDE, Jörg HERMSDORF, Steffen FRANKE, Diego GONZALEZ
Double-pulse LIBS is a promising technique for deep-sea applications. LIBS measurements in shallow water with up to 400 mJ each pulse were done to select laser parameters which promote optimized spectral line emission from plasma even at elevated pressures, where line broadening until loss of most of the spectral information can occur. Optical emission spectroscopy, using a Czerny-Turner spectrometer
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Preliminary electromagnetic analysis of the COOL blanket for CFETR Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-01-01 Shuailing LU, Xuebin MA, Songlin LIU
The supercritical CO2 cOoled Lithium-Lead (COOL) blanket has been designed as one advanced blanket candidate for the Chinese Fusion Engineering Test Reactor (CFETR). This work focuses on the electromagnetic (EM) loads (Maxwell force and Lorentz force) acting on the COOL blanket, which are important mechanical loads in further structural analysis of the COOL blanket. A 3D electromagnetic analysis is
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Gyro-Landau-fluid simulations of impurity effects on ion temperature gradient driven turbulence transport Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-01-01 Yifei LIU, Jiquan LI
The effects of impurities on ion temperature gradient (ITG) driven turbulence transport in tokamak core plasmas are investigated numerically via global simulations of microturbulence with carbon impurities and adiabatic electrons. The simulations use an extended fluid code (ExFC) based on a four-field gyro-Landau-fluid (GLF) model. The multispecies form of the normalized GLF equations is presented
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Gyrokinetic simulation of magnetic-island-induced electric potential vortex mode Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-01-01 Feng WANG, Jiquan LI, Hongpeng QU, Xiaodong PENG
Ion temperature gradient (ITG)-driven turbulence with embedded static magnetic islands is simulated by utilizing a gyrokinetic theory-based global turbulence transport code (GKNET) in this work. Different from the traditional equilibrium circular magnetic-surface average (EMSA) method, an advanced algorithm that calculates the perturbed magnetic-surface average (PMSA) of the electric potential has
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Investigation on the roles of equilibrium toroidal rotation during edge-localized mode mitigated by resonant magnetic perturbations Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-01-01 Liangkang DONG, Shaoyong CHEN, Maolin MOU, Yang LUO, Chenchen QIN, Changjian TANG
The effects of equilibrium toroidal rotation during edge-localized mode (ELM) mitigated by resonant magnetic perturbation (RMP) are studied with the experimental equilibria of the EAST tokamak based on the four-field model in the BOUT++ code. As the two main parameters to determine the toroidal rotation profiles, the rotation shear and magnitudes were separately scanned to investigate their roles in
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Plasma nitrogen fixation system with dual-loop enhancement for improved energy efficiency and its efficacy for lettuce cultivation Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-01-01 Zeyang HAN, Mengxue ZHANG, Di ZHANG, Xin HE, Tianjun JING, Zhixuan GE, Yuge LI, Tong ZHU, Yunhong REN, Chongshan ZHONG, Fang JI
Plasma nitrogen fixation (PNF) has been emerging as a promising technology for greenhouse gas-free and renewable energy-based agriculture. Yet, most PNF studies seldom address practical application-specific issues. In this work, we present the development of a compact and automatic PNF system for on-site agricultural applications. The system utilized a gliding-arc discharge as the plasma source and
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Ion-acoustic waves with non-planar wavefronts Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-01-01 Shujaht BUKHARI, Muhammad SHAHID, Ata-ur RAHMAN
The ion-acoustic (IA) mode exhibiting various orbital angular momentum (OAM) states is examined in a plasma with drifting electrons. The constituent plasma species are modeled with a non-gyrotropic Maxwellian distribution and discussion of dispersion relation and growth rate of twisted IA waves under various conditions is presented. In the domain of kinetic model, the twisted IA waves are characterized
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Modification of streamer-to-leader transition model based on radial thermal expansion in the sphere-plane gap discharge at high altitude Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-01-01 Jianghai GENG, Guo LIN, Ping WANG, Yujian DING, Yang DING, Hua YU
Historically, streamer-to-leader transition studies mainly focused on the rod-plane gap and low altitude analysis, with limited attention paid to the sphere-plane gap at high altitude analysis. In this work, sphere-plane gap discharge tests were carried out under the gap distance of 5 m at the Qinghai Ultra High Voltage (UHV) test base at an altitude of 2200 m. The experiments measured the physical
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Different bactericidal abilities of plasma-activated saline with various reactive species prepared by surface plasma-activated air and plasma jet combinations Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-01-01 Yikang JIA, Tianhui LI, Rui ZHANG, Pengyu ZHAO, Zifeng WANG, Min CHEN, Li GUO, Dingxin LIU
Plasma-activated water (PAW), as an extended form of cold atmospheric-pressure plasma, greatly expands the application of plasma-based technology. The biological effects of PAW are closely related to the aqueous reactive species, which can be regulated by the activation process. In this study, surface plasma-activated air (SAA) and a He + O2 plasma jet (Jet) were parallelly combined (the SAA + Jet
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Influence of the position relationship between the cathode and magnetic separatrix on the discharge process of a Hall thruster Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-01-01 Xifeng CAO, Hongning MA, Guojun XIA, Hui LIU, Fangzhou ZHAO, Yuhang WANG, Juhui CHEN
Previous studies have shown that there is an obvious coupling relationship between the installation location of the external cathode and the magnetic separatrix in the plume region of a Hall thruster. In this paper, the particle-in-cell simulation method is used to compare the thruster discharge process under the conditions of different position relationships between the cathode and the magnetic separatrix
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A spatiotemporal evolution model of a short-circuit arc to a secondary arc based on the improved charge simulation method Plasm. Sci. tech. (IF 1.7) Pub Date : 2024-01-01 Haoxi CONG, Yuxuan WANG, Lipan QIAO, Wenjing SU, Qingmin LI
The initial shape of the secondary arc considerably influences its subsequent shape. To establish the model for the arcing time of the secondary arc and modify the single-phase reclosing sequence, theoretical and experimental analysis of the evolution process of the short-circuit arc to the secondary arc is critical. In this study, an improved charge simulation method was used to develop the internal-space
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Endurance-test and theoretical prediction of a rare earth nanocathode for the applied field magnetoplasmadynamic thruster Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-10-16 Ge WANG, Yong LI, Cheng ZHOU, Yanming WEI, Chuncai KONG, Xuecheng ZHENG, Xinwei ZHANG, Zhimao YANG, Jinxing ZHENG, Yuntian CONG, Baojun WANG
The erosion loss of cathode is essential for the lifetime of magnetoplasmadynamic thruster (MPDT). In this work, an endurance test system for MPDT cathodes was designed and developed, and the erosion characteristics, erosion rate and erosion mechanism of the cathode were studied using the system under vacuum condition. The WCe20 hollow cathode was selected to carry out the long-term erosion of 540
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Matrix effect suppressing in the element analysis of soils by laser-induced breakdown spectroscopy with acoustic correction Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-10-11 Zhiquan HE, Li LIU, Zhongqi HAO, Zhishuai XU, Qi WANG, Ying LU, Ziyi ZHAO, Jiulin SHI, Xingdao HE
Laser-induced breakdown spectroscopy (LIBS) has been used for soil analysis, but its measurement accuracy is often influenced by matrix effects of different kinds of soils. In this work, a method for matrix effect suppressing was developed using laser-induced plasma acoustic signals to correct the original spectrum, thereby improving the analysis accuracy of the soil elements. A good linear relationship
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Minimum inhibitory but maximum non-hemolytic concentration of plasma-treated catheters coated with L. tridentata and O. vulgare extracts Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-10-10 Francisco Javier ALONSO-MONTEMAYOR, Miriam Desirée DÁVILA-MEDINA, Alejandro ZUGASTI-CRUZ, Rosa Idalia NARRO-CÉSPEDES, María Guadalupe NEIRA-VELÁZQUEZ, Aidé SÁENZ-GALINDO, Eduardo ALONSO-CAMPOS
Antibacterial extract-coated catheters are promising alternatives to their conventional counterparts, but their hemocompatibility and thermal stability must be studied. Nosocomial bacteria have developed resistance to conventional antibiotics. Herein, the minimum inhibitory but non-hemolytic concentration (MIC-NH) and the thermal stability of Larrea tridentata (L. tridentata) and Origanum vulgare (O
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Physics design of 14 MeV neutron generator facility at the Institute for Plasma Research Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-09-15 H L SWAMI, S VALA, M RAJPUT, M ABHANGI, Ratnesh KUMAR, A SAXENA, Rajesh KUMAR
A high energy and high yield neutron source is a prime requirement for technological studies related to fusion reactor development. It provides a high-energy neutron environment for small-scale fusion reactor components research and testing such as tritium breeding, shielding, plasma-facing materials, reaction cross-section data study for fusion materials, etc. Along with ITER participation, the Institute
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Effect of spin on the instability of THz plasma waves in field-effect transistors under non-ideal boundary conditions Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-09-15 Liping ZHANG, Jiani LI, Jiangxu FENG, Junyan SU
Terahertz (THz) radiation can be generated due to the instability of THz plasma waves in field-effect transistors (FETs). In this work, we discuss the instability of THz plasma waves in the channel of FETs with spin and quantum effects under non-ideal boundary conditions. We obtain a linear dispersion relation by using the hydrodynamic equation, Maxwell equation and spin equation. The influence of
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Hybrid simulation of q = 1 high-order harmonics driven by passing energetic particles in tokamak plasmas Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-09-15 Sheng LIU, Zhenzhen REN, Weihua WANG, Wei SHEN, Jinhong YANG, Hongwei NING
High-order harmonics q(ψ s) = 1 energetic particle modes (EPMs) have been observed in toroidal plasmas experiments with neutral beam injection. To investigate these phenomena, linear properties and nonlinear dynamics of these EPMs driven by passing energetic particles (EPs) are studied via the global hybrid kinetic-magnetohydrodynamic code M3D-K. Simulation results demonstrate that passing EPs’ effects
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Atmospheric pressure pulsed modulated arc discharge plasma Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-09-15 Ji LI, Jingfeng TANG, Haoran ZHANG, Lu WANG, Tianyuan JI, Daren YU, Ximing ZHU
Direct-current (DC) arc plasma has great application values in the field of the chemical industry, but it has the problem of low energy efficiency. Facing the requirement for improving the energy efficiency of the arc, this paper proposes a unique method of pulsed modulated arc (PMA). This method uses high-frequency pulses and reduces the arc current to improve the control of electron temperature.
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The advance of magnetic diagnostics system in support of EAST long-pulsed operation Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-09-15 Dalong CHEN, Biao SHEN, Tonghui SHI, Bihao GUO, Tingyu LI, Lixing CHEN, Minmin XUE, Nan CHU
In EAST long-pulsed discharge (hundreds of seconds), electric magnetic diagnosis (EMD) is very important, since EMD not only monitors tokamak security status but also provides accurate measurement accuracy for reconstruction of the plasma boundary. To avoid current measurement drift, a fiber optic current sensor, based on the Faraday effect, is developed and used for poloidal and plasma current feedback
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Presheath formation and area design limit satellite-based Langmuir probes Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-09-15 Chenyao JIN, Chi-Shung YIP, Haigang SUN, Di JIANG, Wei ZHANG, Guosheng XU, Liang WANG
In this article, the effect of the finite conductive surface area of a satellite on the use of satellite-based Langmuir probes is reviewed in light of the basic theory of asymmetric double Langmuir probes (ADLPs). Recent theoretical and experimental studies have discussed electron sheath/presheath formation and the electron Bohm criterion along with their implications for satellite-based Langmuir probes
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Automatic recognition of defects in plasma-facing material using image processing technology Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-09-11 Jianhua LYU, Chunjie NIU, Yunqiu CUI, Chao CHEN, Weiyuan NI, Hongyu FAN
Observing and analyzing surface images is critical for studying the interaction between plasma and irradiated plasma-facing materials. This paper presents a method for the automatic recognition of bubbles in transmission electron microscope (TEM) images of W nanofibers using image processing techniques and convolutional neural network (CNN). We employ a three-stage approach consisting of Otsu, local-threshold
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Plasma synthesis of various polymorphs of tungsten trioxide nanoparticles using gliding electric discharge in humid air: characterization and photocatalytic properties Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-08-28 Romaric L SEUTCHA, Georges KAMGANG-YOUBI, Elie ACAYANKA, Valeria VERMILE, François DEVRED, Eric M GAIGNEAUX, Samuel LAMINSI
A gliding electric arc (glidarc) discharge generates a low-temperature plasma at atmospheric pressure. When the discharge occurs in humid air as the feed gas, the chemistry of a glidarc plasma consists of in situ formation of HO° and NO° as the primary chemical species. Tungsten trioxide (WO3) nanoparticles were successfully prepared by exposure of a liquid precursor to glidarc plasma. The WO3 samples
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Numerical simulation of ultrashort-pulse reflectometry (USPR) on EAST Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-08-28 Xiaofeng YU, Ran CHEN, Xiaoliang LI, Yilun ZHU, Calvin W DOMIER, Xinglei RUAN, Taihao HUANG, Jin GUO, Ziyu LIN, Guosheng XU, Shifeng MAO, Neville C LUHMANN, Minyou YE
The microwave reflectometer is a popular non-intrusive plasma density diagnostic instrument on tokamaks that provides centimeter and millisecond level resolution. The ultrashort-pulse reflectometer (USPR) achieves plasma density measurement by emitting a chirped wave containing a broadband signal and measuring the time of flight from different frequency components. A USPR system is currently being
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Effect of different process conditions on the physicochemical and antimicrobial properties of plasma-activated water Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-08-28 Zhicheng CAI, Jiamei WANG, Yuanyuan WANG, Xiaohan SANG, Lixian ZENG, Wentao DENG, Jianhao ZHANG
The physicochemical properties of plasma-activated water (PAW) generated under different process conditions were investigated, and their changes under different storage conditions were also studied. The results showed that increasing the processing time and power, and decreasing generated water volume, could cause an increase in the redox potential, conductivity, and temperature of PAW, and a decrease
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Study of a collisionless magnetized plasma sheath with nonextensively distributed species Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-08-28 R PAUL, K DEKA, G SHARMA, R MOULICK, S ADHIKARI, S S KAUSIK, B K SAIKIA
A weakly magnetized sheath for a collisionless, electronegative plasma comprising positive ions, electrons, and negative ions is investigated numerically using the fluid approach. The electrons are considered to be non-Maxwellian in nature and are described by Tsalli’s distribution. Such electrons have a substantial effect on the sheath properties. The study also reveals that non-Maxwellian distribution
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Numerical study of the self-pulsing of DC discharge: from corona to parallel-plate configurations Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-08-28 Manqi ZHANG, Feng HE, Hongmei CAI, Zeduan ZHANG, Zhiliang GAO, Ming YANG, Ruojue WANG, Yu ZHANG, Ben LI, Lei WANG, Jiting OUYANG
We present here an investigation of the self-pulsing phenomenon of negative corona and parallel-plate discharge in argon within one frame of a one-dimensional fluid model in cylinder–cylinder electrode geometry. The transition from corona to parallel-plate discharge is obtained by changing the inner and outer radii of the electrodes. The model reproduces the self-pulsing waveform well and provides
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Enhanced surface-insulating performance of EP composites by doping plasma-fluorinated ZnO nanofiller Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-08-28 Qijun DUAN, Yanze SONG, Shuai SHAO, Guohua YIN, Haoou RUAN, Qing XIE
The surface flashover of epoxy resin (EP) composites is a pivotal problem in the field of high-voltage insulation. The regulation of the interface between the filler and matrix is an effective means to suppress flashover. In this work, nano ZnO was fluorinated and grafted using low-temperature plasma technology, and the fluorinated filler was doped into EP to study the DC surface flashover performance
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Room-temperature degradation of o-xylene in simulated air using an online-regenerable plasma-catalysis reactor with low amounts of nanosized noble metals on Co3O4 Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-14 Shucheng DI, Jiacheng XU, Shuiliang YAO, Jing LI, Zuliang WU, Erhao GAO, Jiali ZHU, Lianxin DAI, Weihua LIU, Buhe ZHANG, Junwei ZHANG
The plasma catalytic degradation of o-xylene in simulated air was improved by loading low amounts of Pt, Pd, or Au onto Co3O4. At room temperature, o-xylene conversion and CO x selectivity using a 0.1 wt% Pt/Co3O4 catalyst reached 98.9% and 80%, and the energy efficiency was at the top level in comparison with values in the literature. A stable o-xylene degradation performance could be obtained by
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Non-invasive optical characterization and estimation of Zn porosity in gas tungsten arc welding of Fe–Al joints using CR model and OES measurements Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-13 Sai SRIKAR, Tinku KUMAR, Degala Venkata KIRAN, Reetesh Kumar GANGWAR
In this study, we employed a non-invasive approach based on the collisional radiative (CR) model and optical emission spectroscopy (OES) measurements for the characterization of gas tungsten arc welding (GTAW) discharge and quantification of Zn-induced porosity during the GTAW process of Fe–Al joints. The OES measurements were recorded as a function of weld current, welding speed, and input waveform
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Preparation of a beam emission spectroscopy diagnostic based on a Lyman-alpha line to diagnose core and edge-plasma density fluctuation on the HL-2A tokamak Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-13 Yi YU, Yixuan ZHOU, Rui KE, Lin NIE, Chijie XIAO, Jiquan LI, Guangzhou HAO, Min XU, Zhibin WANG, Jian CHEN
In this article, the design of a Lyman-alpha-based beam emission spectroscopy (LAB) diagnostic on the HL-2A tokamak has been proposed for the first time. The purpose of this novel diagnostic is to measure density fluctuations of tokamak plasma. The light-collection system of LAB, which consists of the first mirror and two groups of coaxial double-mirror telescopes, can realize a two-segmented viewing
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High-order field theory and a weak Euler–Lagrange–Barut equation for classical relativistic particle-field systems Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-13 Peifeng FAN, Qiang CHEN, Jianyuan XIAO, Zhi YU
In both quantum and classical field systems, conservation laws such as the conservation of energy and momentum are widely regarded as fundamental properties. A broadly accepted approach to deriving conservation laws is built using Noether’s method. However, this procedure is still unclear for relativistic particle-field systems where particles are regarded as classical world lines. In the present study
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SOLPS-ITER drift modeling of neon impurity seeded plasmas in EAST with favorable and unfavorable toroidal magnetic field direction Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-13 Fuqiong WANG, Yunfeng LIANG, Yingfeng XU, Xuejun ZHA, Fangchuan ZHONG, Songtao MAO, Yanmin DUAN, Liqun HU
To better understand divertor detachment and asymmetry in the Experimental Advanced Superconducting Tokamak (EAST), drift modeling via the comprehensive edge plasma code SOLPS-ITER of neon impurity seeded plasmas in favorable/unfavorable toroidal magnetic field (B T) has been performed. Firstly, electrostatic potential/field ( ϕ /E) distribution has been analyzed, to make sure that ϕ and E are correctly
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A study of grid failure mode drivers and methods for accelerated life testing of a 30 cm diameter ion thruster Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-13 Mingming SUN, Jianfei LONG, Juanjuan CHEN, Wei YANG, Weilong GUO, Xinwei CHEN
In view of the high cost caused by the 1:1 lifetime verification test of ion thrusters, the lifetime acceleration test should be considered. This work uses the PIC-MCC (Particle-in-Cell Monte-Carlo Collision) method to analyze the five failure factors that lead to the failure of the accelerator grid of a 30 cm diameter ion thruster under the working mode of 5 kW. Meanwhile, the acceleration stress
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Development of an atmospheric fluorocarbon plasma jet generated by pulse modulated microwave discharge Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-07 Sile CHEN, Xinliu REN, Zhaoquan CHEN, Xiaojuan XU, Tao CHENG, Ping LI, Guanjun ZHANG, Xinpei LU
Atmospheric fluorocarbon plasma plays an important role in the surface modification of insulating materials like polymers. The existing fluorocarbon plasma is usually generated by dielectric barrier discharge, which has a low concentration of reactive species and may cause insufficient surface fluorination. This work attempts to develop an atmospheric fluorocarbon plasma jet using a coaxial transmission
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Design of new resonant magnetic perturbation coils on the J-TEXT tokamak Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-07 Zhuo HUANG, Song ZHOU, Jinrong FAN, Da LI, Bo RAO, Nengchao WANG, Yonghua DING, Feiyue MAO, Mingxiang HUANG, Wei TIAN, Zhongyong CHEN, Zhipeng CHEN, Yunfeng LIANG, the J-TEXT Team4
The resonant magnetic perturbation (RMP) system is a powerful auxiliary system on tokamaks. On the J-TEXT tokamak, a set of new in-vessel coils is designed to enhance the amplitude of the RMP. The new coils are designed to be two-turn saddle coils. These two-turn saddle coils have been optimized in terms of their structure, support, and protection components to overcome the limitations of the narrow
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Investigation of phase modulation and propagation-route effect from unmatched large-scale structures for Doppler reflectometry measurement through 2D full-wave modeling Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-07 Xi FENG, Adi LIU, Chu ZHOU, Xiaolan ZOU, Ge ZHUANG, Shouxin WANG, Mingyuan WANG, Haiqing LIU, Weixing DING, Shoubiao ZHANG, Muquan WU, Xiang ZHU, Baolong HAO, Jin ZHANG, Zhaoyang LIU, Jiaxu JI, Xiaoming ZHONG, Shen LIU, Jinlin XIE, Xiaodong LIN, Jianjun HUANG, Xiang GAO, Yuanxi WAN
To interpret the common symmetric peaks caused by the large-scale structure in the complex S(f) spectrum from the heterodyne Doppler reflectometry (DR) measurement in EAST, a 2D circular-shaped O-mode full-wave model based on the finite-difference time-domain method is built. The scattering characteristics and the influences on the DR signal from various scales are investigated. When the structure
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Research on degradation mechanism of trichlorobenzene and Hg0 by nonthermal plasma catalysis Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-07 Wenjing BIAN, Tao ZHU, Fan ZHU, Yan CUI, Jianhua WANG, Guang SHI, Jiawang LI, Jingzhang HAO
Aiming at mercury and dioxin in fire coal gas as research objects, nonthermal plasma (NTP) catalytic technology was used to investigate the degradation effect of operating condition parameters on mixed pollutants in mixed flue gas condition, and to explore the synergistic degradation of Hg0 and TCB (1, 2, 3-trichlorobenzene, TCB) under mixed flue gas conditions. The research results showed that the
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Experimental and numerical investigation on the uniformity of nanosecond pulsed dielectric barrier discharge influenced by pulse parameters Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-07 Dongxuan ZHANG, Junxian YU, Mengyao LI, Jie PAN, Feng LIU, Zhi FANG
Nanosecond (ns) pulsed dielectric barrier discharge (DBD) is considered as a promising method to produce controllable large-volume and high activity low-temperature plasma at atmospheric pressure, which makes it suitable for wide applications. In this work, the ns pulse power supply is used to excite Ar DBD and the influences of the pulse parameters (voltage amplitude, pulse width, pulse rise and fall
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Ionization wave propagation and cathode sheath formation due to surface dielectric-barrier discharge sustained in pulsed mode Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-07 Konstantinos GIOTIS, Panagiotis SVARNAS, Eleftherios AMANATIDES, Kristaq GAZELI, Guillaume LOMBARDI, Polykarpos K PAPADOPOULOS
This work deals with the experimental study of a surface dielectric-barrier discharge, as a part of the ongoing interest in the control of plasma induced electro-fluid dynamic effects (e.g. plasma actuators). The discharge is generated using a plasma reactor consisting of a fused silica plate which is sandwiched between two printed circuit boards where the electrodes are developed. The reactor is driven
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Multiple chemical warfare agent simulant decontamination by self-driven microplasma Plasm. Sci. tech. (IF 1.7) Pub Date : 2023-07-07 Shubin CHEN, Shiyu WANG, Anna ZHU, Ruixue WANG
Low-temperature plasma is a green and high-efficiency technology for chemical warfare agent (CWA) decontamination. However, traditional plasma devices suffer from the problems of high-power composition and large power-supply size, which limit their practical applications. In this paper, a self-driven microplasma decontamination system, induced by a dielectric-dielectric rotary triboelectric nanogenerator