Plasma Science & Technology最新文献_第2页

A large-scale cold plasma jet: generation mechanism and application effect 大规模冷等离子体射流：产生机理和应用效果

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-12-21 DOI: 10.1088/2058-6272/ad180e

Weisheng Cui, Ruobing Zhang

{"title":"A large-scale cold plasma jet: generation mechanism and application effect","authors":"Weisheng Cui, Ruobing Zhang","doi":"10.1088/2058-6272/ad180e","DOIUrl":"https://doi.org/10.1088/2058-6272/ad180e","url":null,"abstract":"\u0000 Atmospheric pressure cold plasma jets (APCPJs) typically exhibit a slender, conical structure, which imposes limitations on their application for surface modification due to the restricted treatment area. In this paper, we introduce a novel plasma jet morphology known as the large-scale cold plasma jet (LSCPJ), characterized by the presence of both a central conical plasma jet and a peripheral trumpet-like diffuse plasma jet. The experimental investigations have identified the factors influencing the conical and the trumpet-like diffuse plasma jet, and theoretical simulations have shed light on the role of the flow field and the electric field in shaping the formation of the LSCPJ. It is proved that, under conditions of elevated helium concentration, the distributions of impurity gas particles and the electric field jointly determine the plasma jet's morphology. High-speed ICCD camera images confirm the dynamic behavior of plasma bullets in LSCPJ, which is consistent with the theoretical analysis. Finally, it is demonstrated that when applied to the surface treatment of silicone rubber, LSCPJ can achieve a treatment area over 28 times larger than that of APCPJ under equivalent conditions. This paper uncovers the crucial role of impurity gases and electric fields in shaping plasma jet morphology and opens up the possibility of efficiently diversifying plasma jet generation effects through external electromagnetic fields. These insights hold the promise of reducing the generation cost of plasma jets and expanding their applications across various industrial sectors.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138951586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Estimating grain size of microgranular material using laser-induced breakdown spectroscopy combined with machine learning algorithms 利用激光诱导击穿光谱与机器学习算法相结合估算微晶粒材料的晶粒尺寸

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-12-20 DOI: 10.1088/2058-6272/ad1792

Zhao Zhang, Ya-ju Li, Guanghui Yang, Qiang Zeng, Xiaolong Li, Liangwen Chen, D. Qian, Dui-xiong Sun, Maogen Su, Lei Yang, Shaofeng Zhang, Xinwen Ma

{"title":"Estimating grain size of microgranular material using laser-induced breakdown spectroscopy combined with machine learning algorithms","authors":"Zhao Zhang, Ya-ju Li, Guanghui Yang, Qiang Zeng, Xiaolong Li, Liangwen Chen, D. Qian, Dui-xiong Sun, Maogen Su, Lei Yang, Shaofeng Zhang, Xinwen Ma","doi":"10.1088/2058-6272/ad1792","DOIUrl":"https://doi.org/10.1088/2058-6272/ad1792","url":null,"abstract":"\u0000 Recent work validated a new method for estimating grain size of microgranular materials in the range of tens-to-hundreds micrometers using laser-induced breakdown spectroscopy (LIBS). In that situation, univariate analysis was performed and a piecewise model has to be constructed for achieving the estimation of the grain size within such a wide range. This is due to the fact that a complex dependence of plasma formation environment (i.e., the status of luminous plasma and therefore LIBS signal to be measured) on grain size occurs in the size range studied there. In the present work, we tentatively construct a unified calibration model suitable for LIBS-based estimation of those grain sizes. Specifically, two unified multivariate calibration models are constructed based on back-propagation neural network (BPNN) algorithms using the feature selection strategies with and without considering physical prior knowledge, respectively. By detailed analysis of the performances of the two multivariate models, it was found that, a unified calibration model can be constructed successfully based on BPNN algorithms for estimating the grain size in the range of tens-to-hundreds micrometers. It was also found that this model constructed with a physics-guided feature selection strategy has better prediction performances. This study has practical significance in developing the technology for material analysis using LIBS, especially in the case that LIBS signal exhibits a complex dependence on the material parameter to be estimated.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138958614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inward particle transport driven by biased endplate in a cylindrical magnetized plasma 圆柱形磁化等离子体中由偏置端板驱动的粒子向内输送

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-12-17 DOI: 10.1088/2058-6272/ad1676

Yue Ge, T. Xu, Chijie Xiao, Zhibin Guo, Xiaogang Wang, R. He, Xiaoyi Yang, Zuyu Zhang, Ruixin Yuan

{"title":"Inward particle transport driven by biased endplate in a cylindrical magnetized plasma","authors":"Yue Ge, T. Xu, Chijie Xiao, Zhibin Guo, Xiaogang Wang, R. He, Xiaoyi Yang, Zuyu Zhang, Ruixin Yuan","doi":"10.1088/2058-6272/ad1676","DOIUrl":"https://doi.org/10.1088/2058-6272/ad1676","url":null,"abstract":"\u0000 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 Plasma Test (PPT) device. The results reveal that the inward particle flux increases with the bias voltage of the endplate. It is also found that the profile of radial electric field (E_r) shear is flattened by the increased bias voltage. Radial velocity fluctuations (V_r) affect the inward particle more than density fluctuations. And the frequency of the dominant mode driving inward particle flux increases with the biased voltage applied to the endplate. The experimental results in the PPT device provide a method to actively control the inward particle flux actively using a biased endplate and enrich the understanding of the relationship between E_r×B shear and turbulence transport.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138966760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Progress of Lyman-alpha-based beam emission spectroscopy (LyBES) diagnostic on the HL-2A tokamak 基于莱曼-阿尔法的光束发射光谱（LyBES）在 HL-2A 托卡马克上的诊断进展

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-12-15 DOI: 10.1088/2058-6272/ad162a

Yixuan Zhou, Yi Yu, Min Xu, Rui Ke, Lin Nie, Hao Xu, Guangyi Zhao, Hao Liu, Zihao Yuan, Chenyu Xiao, Jiquan Li, Chijie Xiao

{"title":"Progress of Lyman-alpha-based beam emission spectroscopy (LyBES) diagnostic on the HL-2A tokamak","authors":"Yixuan Zhou, Yi Yu, Min Xu, Rui Ke, Lin Nie, Hao Xu, Guangyi Zhao, Hao Liu, Zihao Yuan, Chenyu Xiao, Jiquan Li, Chijie Xiao","doi":"10.1088/2058-6272/ad162a","DOIUrl":"https://doi.org/10.1088/2058-6272/ad162a","url":null,"abstract":"\u0000 An edge Lyman-alpha-based beam emission spectroscopy (LyBES) diagnostic, using a heating NBI (neutral beam injection) system, is currently under development on the HL-2A tokamak. The 20-channel edge LyBES, which is intended to measure the density fluctuation in plasma edge (from R = 1960 mm to R = 2026 mm) with an improved spatial resolution of 3.3 mm, is a complement to the existing conventional beam emission spectroscopy (BES) diagnostic. In this article, we introduce the progress of LyBES diagnostic, including the collection optics, the monochromator, and the detector system. The reflectance of the collection mirrors is measured to be ~82% at 122 nm, and the aberration geometrical radius of the collection optics is tested to be ~150 μm in the aimed area. The linear dispersion of the LyBES monochromator is designed to be ~0.09 nm mm−1. The bandwidth of the detector system with the 5×107 V A−1 preamplifier gain is measured to be ~280 kHz, and the peak-to-peak noise of the detector system is tested to be ~16 mV. The finalized design, components development and testing of the LyBES diagnostic have been completed at present, and an overall performance of the LyBES diagnostic is to be confirmed in the next HL-2A campaign.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139000356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Forward modelling of the Cotton-Mouton effect polarimetry on EAST tokamak EAST 托卡马克上的科顿-穆顿效应极化测量前向建模

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-12-14 DOI: 10.1088/2058-6272/ad15df

Minyong Shen, Jibo Zhang, Yao Zhang, Y. Jie, Haiqing Liu, Jinlin Xie, Weixing Ding

{"title":"Forward modelling of the Cotton-Mouton effect polarimetry on EAST tokamak","authors":"Minyong Shen, Jibo Zhang, Yao Zhang, Y. Jie, Haiqing Liu, Jinlin Xie, Weixing Ding","doi":"10.1088/2058-6272/ad15df","DOIUrl":"https://doi.org/10.1088/2058-6272/ad15df","url":null,"abstract":"\u0000 Measurement of plasma electron density by far-infrared laser polarimetry has become a routine and indispensable tool in magnetic confinement fusion research. This article presents the design of a Cotton-Mouton polarimetric interferometer, which provides a reliable density measurement without fringe jumps. Cotton-Mouton effect on EAST is studied by Stokes equation with three parameters (s1, s2, s3). It demonstrates that under the condition of a small Cotton-Mouton effect, parameter s2 contains information about Cotton-Mouton effect which is proportional to the line-integrated density. For a typical EAST plasma, the magnitude of Cotton-Mouton effects is less than 2π for laser wavelength 432µm. Refractive effect due to density gradient is calculated to be negligible. Time modulation of Stokes parameters (s2, s3) provides heterodyne measurement. Due to the instabilities arising from laser oscillation and beam refraction in plasmas, it is necessary for the system to be insensitive to variations in the amplitude of the detection signal. Furthermore, it is shown that non-equal amplitude of X-mode and O-mode within a certain range only affects the DC offset of Stokes parameters (s2,s3) but does not greatly influence the phase measurements of Cotton-Mouton effects.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139001523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonlinear dynamics of the reversed shear Alfvén eigenmode in burning plasmas 燃烧等离子体中反向剪切阿尔费文特征模式的非线性动力学特性

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-12-14 DOI: 10.1088/2058-6272/ad15e0

Tao Wang, S. Wei, S. Briguglio, G. Vlad, F. Zonca, Zhiyong Qiu

{"title":"Nonlinear dynamics of the reversed shear Alfvén eigenmode in burning plasmas","authors":"Tao Wang, S. Wei, S. Briguglio, G. Vlad, F. Zonca, Zhiyong Qiu","doi":"10.1088/2058-6272/ad15e0","DOIUrl":"https://doi.org/10.1088/2058-6272/ad15e0","url":null,"abstract":"\u0000 In a tokamak fusion reactor operated at steady state, the equilibrium magnetic field is likely to have reversed shear in the core region, as the noninductive bootstrap current profile generally peaks off-axis. The reversed shear Alfvén eigenmode (RSAE) as a unique branch of the shear Alfvén wave in this equilibrium, can exist with a broad spectrum in wavenumber and frequency, and be resonantly driven unstable by energetic particles (EP). After briefly discussing the RSAE linear properties in burning plasma condition, we review several key topics of the nonlinear dynamics for the RSAE through both wave-EP resonance and wave-wave coupling channels, and illustrate their potentially important role in reactor-scale fusion plasmas. By means of simplified hybrid MHD-kinetic simulations, the RSAEs are shown to have typically broad phase space resonance structure with both circulating and trapped EP, as results of weak/vanishing magnetic shear and relatively low frequency. Through the route of wave-EP nonlinearity, the dominant saturation mechanism is mainly due to the transported resonant EP radially decoupling with the localized RSAE mode structure, and the resultant EP transport generally has a convective feature. The saturated RSAEs also undergo various nonlinear couplings with other collective oscillations. Two typical routes as parametric decay and modulational instability are studied using nonlinear gyrokinetic theory, and applied to the scenario of spontaneous excitation by a finite amplitude pump RSAE. Multiple RSAEs could naturally couple and induce the spectral energy cascade into a low frequency Alfvénic mode, which may effectively transfer the EP energy to fuel ions via collisionless Landau damping. Moreover, zero frequency zonal field structure could be spontaneously excited by modulation of the pump RSAE envelope, and may also lead to saturation of the pump RSAE by both scattering into stable domain and local distortion of the continuum structure.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138973901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A research on the effect of plasma spectrum collection device on LIBS spectral intensity 等离子体光谱收集装置对 LIBS 光谱强度影响的研究

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-12-14 DOI: 10.1088/2058-6272/ad15e1

Xiaomei Lin, Yanjie Dong, Jingjun Lin, Yutao Huang, Jiangfei Yang, Xingyu Yue, Zhuojia Zhang, Xinyang Duan

{"title":"A research on the effect of plasma spectrum collection device on LIBS spectral intensity","authors":"Xiaomei Lin, Yanjie Dong, Jingjun Lin, Yutao Huang, Jiangfei Yang, Xingyu Yue, Zhuojia Zhang, Xinyang Duan","doi":"10.1088/2058-6272/ad15e1","DOIUrl":"https://doi.org/10.1088/2058-6272/ad15e1","url":null,"abstract":"\u0000 Only a small amount of spectral information is collected because the collection solid angle of the optical fiber probe and lens is very limited，when collecting spectral information. To overcome this limitation, this study presents a novel method for acquiring plasma spectral information from various spatial directions. A parabolic-shaped plasma spectral collection device(PSCD) is employed to effectively collect more spectral information into the spectrometer, thereby enhancing the overall spectral intensity. The research objects in this study were soil samples containing different concentrations of heavy metals Pb, Cr, and Cd. The results indicate that the PSCD significantly enhances the spectral signal, with an enhancement rate of up to 45%. Moreover, the signal-to-noise ratio also increases by as much as 36%. Simultaneously, when compared to the absence of a device, it is found that there is no significant variation in plasma temperature when the PSCD is utilized. This observation eliminates the impact of the spatial effect caused by the PSCD on the spectral intensity. Consequently, a concentration-spectral intensity relationship curve is established under the PSCD. The results revealed that the linear fitting R2 for Pb, Cr, and Cd increased by 0.011, 0.001, and 0.054, respectively. Additionally, the limit of detection (LOD) decreased by 0.361 ppm, 0.901 ppm, and 0.602 ppm, respectively. These findings indicate that the spectral enhancement rate elevates with the increase in heavy metal concentration. Hence, the PSCD can effectively enhance the spectral intensity and reduce the detection limit of heavy metals in soil.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138975529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient simultaneous removal of DPM and HC from diesel exhaust gas at low temperatures over Cu-CeO2/Al2O3 coupling with DBD plasma 通过 Cu-CeO2/Al2O3 与 DBD 等离子体耦合，在低温条件下同时高效去除柴油机废气中的 DPM 和 HC

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-12-13 DOI: 10.1088/2058-6272/ad1572

Baoyong Ren, Shiyu Fang, Tiantian Zhang, Yan Sun, Erhao Gao, Jing Li, Zu-liang Wu, Jiali Zhu, Wei Wang, S. Yao

引用次数: 0

An improved training framework in neural network model fordisruption prediction and its application on EXL-50 改进的中断预测神经网络模型训练框架及其在 EXL-50 上的应用

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-12-13 DOI: 10.1088/2058-6272/ad1571

Jianqing Cai, Yunfeng Liang, Alexander Knieps, dongkai qi, Erhui Wang, Haoming Xiang, Liang Liao, Jie Huang, Jie Yang, Jia Huang, Jianwen Liu, P. Drews, Shuai Xu, xiang gu, Yichen Gao, Yu Luo, zhi li

引用次数: 0

Preliminary study of the electrospray DPE peculiarities from the liquid surface in the presence of the CSWs 对 CSW 存在时液体表面电喷雾 DPE 特性的初步研究

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-12-13 DOI: 10.1088/2058-6272/ad1570

Weiguo He, Weijie Huo, Luofeng Han, Kangwu Zhu, Feng Wang, Zekun Wang

{"title":"Preliminary study of the electrospray DPE peculiarities from the liquid surface in the presence of the CSWs","authors":"Weiguo He, Weijie Huo, Luofeng Han, Kangwu Zhu, Feng Wang, Zekun Wang","doi":"10.1088/2058-6272/ad1570","DOIUrl":"https://doi.org/10.1088/2058-6272/ad1570","url":null,"abstract":"\u0000 The Ultrasonic Electric Propulsion (UEP) system is a cutting-edge propulsion technology that is mostly used on platforms for small satellites (less than 10 kg). The characteristics of droplet partial emissions (DPEs) in the UEP system are investigated using a high-speed imaging technique (an ultra-high speed camera (NAC HX-6) and a long-distance microscope) in this work. The experiments demonstrate that there are a few partial emission modes, including left-side emission, double-side emission, and right-side emission, that are present in the droplet emission process of the UEP system. These modes are primarily caused by the partial formation of capillary standing waves (CSWs) on the emission surface of the ultrasonic nozzle. The emission rate for single- and double-sided emissions varies at different times, indicating that there are different CSWs engaged in droplet emission due to variations in the liquid film thickness and charge state of the liquid cones. Additionally, as the droplets emit continuously, a raised area on the emission surface appears, with several droplets emitting there as a result of charge accumulation. Additionally, photos of the CSWs with emitting droplets are obtained, which highlights the CSWs’ distinctive wave morphology.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139005760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0