Plasma Science & Technology最新文献_第4页

Experimental results of a magnetic field modification to the radio frequency driver of a negative ion source 对负离子源射频驱动器进行磁场改造的实验结果

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-11-28 DOI: 10.1088/2058-6272/ad1043

Junwei Xie, Yahong Xie, Jianglong Wei, L. Liang, Xu-Feng Peng, Yuwen Yang, Y. Gu, Chundong Hu, Yuanlai Xie

引用次数: 0

Experimental study of core MHD behavior and novel algorithm of rational surface detection based on profile reflectometry in EAST 核心 MHD 行为的实验研究和基于 EAST 剖面反射测量的合理表面检测新算法

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-11-22 DOI: 10.1088/2058-6272/ad0f0a

Kaixuan Ye, Zhen Zhou, Tao Zhang, Jiuyang Ma, Yumin Wang, Gongshun Li, K. Geng, Ming-Shan Wu, Fei Wen, Jia Huang, Yang Zhang, Lin Ming Shao, Shuqi Yang, Fubin Zhong, S. Gao, Lin Yu, Ziqiang Zhou, Haoming Xiang, Xiang Han, Shoubiao Zhang, Guoqiang Li, Xiang Gao

{"title":"Experimental study of core MHD behavior and novel algorithm of rational surface detection based on profile reflectometry in EAST","authors":"Kaixuan Ye, Zhen Zhou, Tao Zhang, Jiuyang Ma, Yumin Wang, Gongshun Li, K. Geng, Ming-Shan Wu, Fei Wen, Jia Huang, Yang Zhang, Lin Ming Shao, Shuqi Yang, Fubin Zhong, S. Gao, Lin Yu, Ziqiang Zhou, Haoming Xiang, Xiang Han, Shoubiao Zhang, Guoqiang Li, Xiang Gao","doi":"10.1088/2058-6272/ad0f0a","DOIUrl":"https://doi.org/10.1088/2058-6272/ad0f0a","url":null,"abstract":"Microwave reflectometry is a powerful diagnostic that can measure the density profile and localized turbulence with high spatial and temporal resolution and will be used in ITER, so the understanding of the influence of plasma perturbations on the reflect signal is important. The characteristics of the reflect signal from profile reflectometry, the time-of-fight (TOF) signal to the MHD instabilities are investigated in EAST. Using a 1D full-wave simulation code by the FDTD method, it is well validated that the local density flattening could induce the discontinuity of the simulated TOF signal and an obvious change of reflect amplitude. Experimental TOF signals associated with different types of MHD instabilities (sawtooth, sawtooth precursors and tearing mode) are studied in detail and show agreement with the simulation. Two new improved algorithms for detecting and localizing the radial positions of the low-order rational surface, the Cross-correlation and Gradient Threshold (CGT) method and the 2D Convolutional Neural Network approach (CNN) are presented for the first time. It is concluded that the TOF signal analysis from profile reflectometry can provide a straightforward and localized measurement of the plasma perturbation from the edge to the core simultaneously and may be a complement or correction to the q-profile control, which will be beneficial for the advanced tokamak operation.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139250250","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

Study of plasma parameters of coaxial plasma source using triple Langmuir probe and Faraday cup diagnostics 利用三重朗缪尔探针和法拉第杯诊断法研究同轴等离子源的等离子参数

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-11-22 DOI: 10.1088/2058-6272/ad0f09

Kanchi Sunil, Rohit Shukla, Archana Sharma

{"title":"Study of plasma parameters of coaxial plasma source using triple Langmuir probe and Faraday cup diagnostics","authors":"Kanchi Sunil, Rohit Shukla, Archana Sharma","doi":"10.1088/2058-6272/ad0f09","DOIUrl":"https://doi.org/10.1088/2058-6272/ad0f09","url":null,"abstract":"Coaxial plasma guns are a type of plasma source that produces plasma which propagates radially and axially controlled by the shape of the ground electrode, which has attracted much interest in several applications. In this work, a 120° opening angle of CPG nozzle is used as a plasma gun configuration that operates at the energy of 150 J. The ionization of polyethylene insulator between the electrodes of the gun produces a cloud of hydrogen and carbon plasma. The triple Langmuir probe and Faraday cup are used to measure plasma density and plasma temperature. These methods are used to measure the on-axis and off-axis plasma divergence of the coaxial plasma gun. The peak values of ion densities measured at a distance of 25 mm on-axis from the plasma gun are (1.6±0.5) × 1019 m-3 and (2.8±0.6) × 1019 m-3 for hydrogen and carbon plasma respectively and the peak temperature is (3.02±0.5) eV. The mean propagation velocity of plasma is calculated using the transit times of plasma at different distances from the plasma gun and is found to be (4.54±0.25) cm/μs and (1.81±0.18) cm/μs for hydrogen and carbon plasma respectively. The Debye radius is obtained from the measured experimental data that satisfies the thin sheath approximation. The shot-to-shot stability of plasma parameters facilitates the use of plasma guns in laboratory experiments. These types of plasma sources can be used in many applications like plasma opening switches, plasma devices, and as plasma sources.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139247528","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

Optical design of a novel near-infrared phase contrast imaging (NI-PCI) diagnostic on the HL-2A tokamak HL-2A 托卡马克上新型近红外相衬成像（NI-PCI）诊断仪的光学设计

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-11-20 DOI: 10.1088/2058-6272/ad0e0b

Hao Xu, Shaobo Gong, Yi Yu, Min Xu, T. Lan, Zhibin Wang, Zhongbing Shi, Lin Nie, Guanyi Zhao, Hao Liu, Yixuan Zhou, Zihao Yuan, Chenyu Xiao, Jian Chen

{"title":"Optical design of a novel near-infrared phase contrast imaging (NI-PCI) diagnostic on the HL-2A tokamak","authors":"Hao Xu, Shaobo Gong, Yi Yu, Min Xu, T. Lan, Zhibin Wang, Zhongbing Shi, Lin Nie, Guanyi Zhao, Hao Liu, Yixuan Zhou, Zihao Yuan, Chenyu Xiao, Jian Chen","doi":"10.1088/2058-6272/ad0e0b","DOIUrl":"https://doi.org/10.1088/2058-6272/ad0e0b","url":null,"abstract":"The optical design of near-infrared phase contrast imaging (NI-PCI) diagnosis on HL-2A is introduced in this paper. This scheme benefits from the great progress of near-infrared laser technology and is broadening of traditional phase contrast technology. This diagnostic canwork as a keen tool to measure plasma wavenumber spectra by inferring string-integrated plasma density fluctuations. Design of both the front optical path which is the path before the laser transmitting into the tokamak plasma and the rear optics which is the path after the laser passing through the plasma is detailed. The 1550 nm laser is chosen as the probe beam and high-precision optical components are designed to fit the laser beam, in which a phase plate with a 194-nm-deep silver groove is the key. Compared with the conventional 10.6 μm laser-based PCI system on HL-2A, NI-PCI significantly overcomes the unwanted phase scintillation effect and promotes the measurement capability of high-wavenumber turbulence with an increased maximal measurable wavenumber from 15 cm−1 to 32.6 cm−1.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139259551","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

Single flow treatment degradation of antibiotics in water using falling-film dielectric barrier discharge 利用降膜式介质阻挡放电对水中的抗生素进行单流处理降解

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-11-17 DOI: 10.1088/2058-6272/ad0deb

Zhiyuan Xu, Cheng Zhang, Yunjian Wu, B. Huang, Dengke Xi, Xiaoxing Zhang, T. Shao

{"title":"Single flow treatment degradation of antibiotics in water using falling-film dielectric barrier discharge","authors":"Zhiyuan Xu, Cheng Zhang, Yunjian Wu, B. Huang, Dengke Xi, Xiaoxing Zhang, T. Shao","doi":"10.1088/2058-6272/ad0deb","DOIUrl":"https://doi.org/10.1088/2058-6272/ad0deb","url":null,"abstract":"The environmental contamination caused by antibiotics is increasingly conspicuous due to their widespread manufacture and misuse. Plasma was employed in recent years for the remediation of antibiotic pollution in the environment. In this work, a falling-film dielectric barrier discharge was used to degrade the antibiotic tetracycline (TC) in water. The reactor combined the gas-liquid discharge and active gas bubbling to improve the TC degradation performance. The discharge characteristics, chemical species’ concentration, and degradation rates at different parameters were systematically studied. Under the optimized conditions (working gas was pure oxygen, liquid flow rate was 100mL/min, gas flow rate was 1L/min, voltage was 20 kV, single treatment), TC was removed beyond 70% in a single flow treatment with an energy efficiency of 145 mg/kW·h. The reactor design facilitated gas and liquid flow in the plasma area to produce more ozone in bubbles after single flow under pure oxygen conditions, affording the fast TC degradation. Furthermore, long-term stationary experiment indicated that long-lived active species can sustain the degradation of TC. Compared with other plasma treatment systems, this work offers a fast and efficient degradation method, showing significant potential in practical industrial applications.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139265946","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 fringe jump counting method for the phase measurement in the HCN laser interferometer on EAST and its FPGA-based implementation 用于 EAST HCN 激光干涉仪相位测量的条纹跃迁计数法及其基于 FPGA 的实现方法

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-11-17 DOI: 10.1088/2058-6272/ad0dec

Yuan Yao, Yao Yang, Ang Ti, Yang Song, Jiamin Zhang, Yan Wang, Yao Zhang, Haiqing Liu, Y. Jie

引用次数: 0

Performance of pulsed plasma thruster at low discharge energy 低放电能量脉冲等离子推进器的性能

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-11-16 DOI: 10.1088/2058-6272/ad0d52

Hong Chun Lee, C. H. Lim, Haw Jiunn Woo, Boon Tong Goh, Oi Hoong Chin, T. Tou

引用次数: 0

A synthetic diagnostics platform for microwave imaging diagnostics in tokamaks 托卡马克微波成像诊断合成诊断平台

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-11-16 DOI: 10.1088/2058-6272/ad0d4c

Zihan Li, Shangchuan Yang, Xinhang Xu, Lifu Zhang, C. Qu, Chengpu Li, Zhuang Ge, Jinlin Xie

引用次数: 0

Effect of desorbed gas on microwave breakdown on vacuum side of dielectric window 解吸气体对介质窗口真空侧微波击穿的影响

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-11-16 DOI: 10.1088/2058-6272/ad0d58

Pengcheng Zhao, Zhongyu Liu, Rui Wang, Panpan Shu, Lixing Guo, Xiangxin Cao

{"title":"Effect of desorbed gas on microwave breakdown on vacuum side of dielectric window","authors":"Pengcheng Zhao, Zhongyu Liu, Rui Wang, Panpan Shu, Lixing Guo, Xiangxin Cao","doi":"10.1088/2058-6272/ad0d58","DOIUrl":"https://doi.org/10.1088/2058-6272/ad0d58","url":null,"abstract":"The gas desorbed from the dielectric surface has a great influence on the characteristics of microwave breakdown on the vacuum side of the dielectric window. In this paper, the dielectric surface breakdown is described by using the electromagnetic particle-in-cell-Monte Carlo collision (PIC-MCC) model. The process of desorption of gas and its influence on the breakdown characteristics are studied. The simulation results show that, due to the accumulation of desorbed gas, the pressure near the dielectric surface increases in time, and the breakdown mechanism transitions from secondary electron multipactor to collision ionization. More and more electrons generated by collision ionization drift to the dielectric surface, so that the amplitude of self-organized normal electric field increases in time and sometimes points to the dielectric surface. Nevertheless, the number of secondary electrons emitted in each microwave cycle is approximately equal to the number of primary electrons. In the early and middle stages of breakdown, the attenuation of the microwave electric field near the dielectric surface is very small. However, the collision ionization causes a sharp increase in the number density of electrons, and the microwave electric field decays rapidly in the later stage of breakdown. Compared with the electromagnetic PIC-MCC simulation results, the mean energy and number of electrons obtained by the electrostatic PIC-MCC model are overestimated in the later stage of breakdown because it does not take into account the attenuation of microwave electric field. The pressure of the desorbed gas predicted by the electromagnetic PIC-MCC model is close to the measured value, when the number of gas atoms desorbed by an incident electron is taken as 0.4.","PeriodicalId":20250,"journal":{"name":"Plasma Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139267778","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

Design of the electron cyclotron emission diagnostic on EXL-50 spherical torus 在 EXL-50 球形环上设计电子回旋加速器发射诊断仪

3区物理与天体物理

Plasma Science & Technology Pub Date : 2023-11-16 DOI: 10.1088/2058-6272/ad0d54

Yumin Wang, Qifeng Xie, Renyi Tao, Hui Zhang, Xiaokun Bo, Tiantian Sun, Xiuchun Lun, Lin Chen, Dong Guo, Bihe Deng, Minsheng Liu

引用次数: 0