Plasma Science and Technology最新文献_第6页

Effects of vacuum magnetic field region on the compact torus trajectory in a tokamak plasma 真空磁场区对托卡马克等离子体中紧凑磁环轨迹的影响

Plasma Science and Technology Pub Date : 2024-03-21 DOI: 10.1088/2058-6272/ad36aa

Qi Dong, Jie Zhang, Tao Lan, C. Xiao, Zhuang Ge, Chen Chen, Yongkang Zhou, Jie Wu, T. Long, Lin Nie, Pengcheng Lu, Tianxiong Wang, Jiaren Wu, Peng Deng, Xingkang Wang, Zeqi Bai, Yuhua Huang, Jie Li, Lie Xue, Yolbarsop Adil, W. Mao, Chu Zhou, A. Liu, Zhengwei Wu, Jinlin Xie, Weixing Ding, Wandong Liu, Wei Chen, Wulyu Zhong, Min Xu, Xuru Duan

{"title":"Effects of vacuum magnetic field region on the compact torus trajectory in a tokamak plasma","authors":"Qi Dong, Jie Zhang, Tao Lan, C. Xiao, Zhuang Ge, Chen Chen, Yongkang Zhou, Jie Wu, T. Long, Lin Nie, Pengcheng Lu, Tianxiong Wang, Jiaren Wu, Peng Deng, Xingkang Wang, Zeqi Bai, Yuhua Huang, Jie Li, Lie Xue, Yolbarsop Adil, W. Mao, Chu Zhou, A. Liu, Zhengwei Wu, Jinlin Xie, Weixing Ding, Wandong Liu, Wei Chen, Wulyu Zhong, Min Xu, Xuru Duan","doi":"10.1088/2058-6272/ad36aa","DOIUrl":"https://doi.org/10.1088/2058-6272/ad36aa","url":null,"abstract":"\u0000 The trajectory of the compact torus (CT) within a tokamak discharge is crucial to fueling. In this study, we developed a penetration model with a vacuum magnetic field region to accurately determine CT trajectories in tokamak discharges. This model was used to calculate the trajectory and penetration parameters of CT injections by applying both perpendicular and tangential injection schemes in both HL-2A and ITER tokamaks. For perpendicular injection along the tokamak's major radius direction from the outboard, CTs with the same injection parameters exhibited an 0.08 reduction in relative penetration depth when injected into HL-2A and a 0.13 reduction when injected into ITER geometry when considering the vacuum magnetic field region compared with cases where this region was not considered. In addition, we proposed an optimization method for determining the CT's initial injection velocity to accurately calculate the initial injection velocity of CTs for central fueling in tokamaks. Furthermore, this paper discusses schemes for the tangential injection of CT into tokamak discharges. The optimal injection angle and CT magnetic moment direction for injection into both HL-2A and ITER were determined through numerical simulations. Finally, the kinetic energy loss occurring when the CT penetrated the vacuum magnetic field region in ITER was reduced by ΔEk=975.08J by optimizing the injection angle for the CT injected into ITER. These results provided valuable insights for optimizing injection angles in fusion experiments. Our model closely represents actual experimental scenarios and can assist the design of CT parameters.","PeriodicalId":506986,"journal":{"name":"Plasma Science and Technology","volume":"56 s197","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140223383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Suppression of the m/n = 2/1 tearing mode by electron cyclotron resonance heating on J-TEXT 通过电子回旋共振加热抑制 J-TEXT 上的 m/n = 2/1 撕裂模式

Plasma Science and Technology Pub Date : 2024-03-20 DOI: 10.1088/2058-6272/ad3616

Fang Jian Gang, Z. Chen, W. Yan, Nengchao Wang, Feiyue Mao, Qiang Luo, Zijian Xuan, Xixuan Chen, Zhengkang Ren, Feng Zhang, Mei Huang, Donghui Xia, Zhoujun Yang, Zhipeng Chen, Yonghua Ding

{"title":"Suppression of the m/n = 2/1 tearing mode by electron cyclotron resonance heating on J-TEXT","authors":"Fang Jian Gang, Z. Chen, W. Yan, Nengchao Wang, Feiyue Mao, Qiang Luo, Zijian Xuan, Xixuan Chen, Zhengkang Ren, Feng Zhang, Mei Huang, Donghui Xia, Zhoujun Yang, Zhipeng Chen, Yonghua Ding","doi":"10.1088/2058-6272/ad3616","DOIUrl":"https://doi.org/10.1088/2058-6272/ad3616","url":null,"abstract":"\u0000 Stabilization of tearing modes and neoclassical tearing modes is of great importance for the tokamak operation. Electron cyclotron wave (ECW) has been extensively used to stabilize the tearing modes with the virtue of the highly localized power deposition. Complete suppression of the m/n = 2/1 tearing mode (TM) by electron cyclotron resonance heating (ECRH) has been achieved successfully on the J-TEXT tokamak. The effect of ECW deposition location and power amplitude on the 2/1 TM suppression have been investigated. It is found that the suppression is more effective when the ECW power is deposited closer to the rational surface. Partial suppression of the 2/1 TM by ECRH has been observed and the island width is reduced by 65% of the initial island width. The island rotation frequency is increased when the island width is reduced. The experimental results show that the temperature perturbations increase inside the magnetic island produced by the local heating plays a dominant role on tearing modes suppression. As the ECW power increased, the 2/1 island is suppressed to smaller islands width and the flow shear also plays a stabilizing effect on small magnetic islands. With the stabilizing contribution of heating and the flow shear, the 2/1 TM can be completely suppressed.","PeriodicalId":506986,"journal":{"name":"Plasma Science and Technology","volume":"9 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140226626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigations on MoS2 plasma by IR pulsed laser irradiation in high vacuum 在高真空条件下通过红外脉冲激光辐照对 MoS2 等离子体的研究

Plasma Science and Technology Pub Date : 2024-03-20 DOI: 10.1088/2058-6272/ad3615

L. Torrisi, L. Silipigni, Alfio Torrisi, M. Cutroneo

{"title":"Investigations on MoS2 plasma by IR pulsed laser irradiation in high vacuum","authors":"L. Torrisi, L. Silipigni, Alfio Torrisi, M. Cutroneo","doi":"10.1088/2058-6272/ad3615","DOIUrl":"https://doi.org/10.1088/2058-6272/ad3615","url":null,"abstract":"\u0000 MoS2 targets were irradiated by Infra-Red (IR) pulsed laser in a high vacuum to determine hot plasma parameters, atomic, molecular and ion emission, and angular and charge state distributions. In this way, pulsed laser deposition (PLD) of thin films on graphene oxide substrates was also realized. A Nd:YAG laser, operating at the 1064 nm wavelength with a 5 ns pulse duration and up to a 1 J pulse energy, in a single pulse or at a 10 Hz repetition rate, was employed. Ablation yield was measured as a function of the laser fluence. Plasma was characterized using different analysis techniques, such as time-of-flight measurements, quadrupole mass spectrometry and fast CCD visible imaging. The so-produced films were characterized by composition, thickness, roughness, wetting ability, and morphology. When compared to the MoS2 targets, they show a slight decrease of S with respect to Mo, due to higher ablation yield, low fusion temperature and high sublimation in vacuum. The pulsed IR laser deposited MoSx (with 1 < x < 2) films are uniform, with a thickness of about 130 nm, a roughness of about 50 nm and a higher wettability than the MoS2 targets. Some potential applications of the pulsed IR laser-deposited MoSx films are also presented and discussed.","PeriodicalId":506986,"journal":{"name":"Plasma Science and Technology","volume":"8 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140227519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of power on ion behaviors in radio-frequency magnetron sputtering of indium tin oxide (ITO) 功率对射频磁控溅射氧化铟锡（ITO）过程中离子行为的影响

Plasma Science and Technology Pub Date : 2024-03-19 DOI: 10.1088/2058-6272/ad3599

Maoyang Li, Chaochao Mo, Jiali Chen, P. Ji, Haiyun Tan, Xiaoman Zhang, Meili Cui, L. Zhuge, Xuemei Wu, Tianyuan Huang

引用次数: 0

The multi-peak point phenomenon of broadband microwave reflection caused by inhomogeneous plasma 非均质等离子体引起的宽带微波反射的多峰点现象

Plasma Science and Technology Pub Date : 2024-03-17 DOI: 10.1088/2058-6272/ad34ba

Min Yang, Kaixuan Qi, Jiuwen Yang, Sa Jia, Haoyan Liu, Yanyang Chen, Jin Li, Xiaoping Li

引用次数: 0

Formation of diffuse and spark discharges between two needle electrodes with the scattering of particles 在两个针电极之间形成弥散放电和火花放电，并伴有颗粒散射

Plasma Science and Technology Pub Date : 2024-03-16 DOI: 10.1088/2058-6272/ad34aa

V. Tarasenko, D. Beloplotov, Panchenko Alexey, Dmitry Sorokin

{"title":"Formation of diffuse and spark discharges between two needle electrodes with the scattering of particles","authors":"V. Tarasenko, D. Beloplotov, Panchenko Alexey, Dmitry Sorokin","doi":"10.1088/2058-6272/ad34aa","DOIUrl":"https://doi.org/10.1088/2058-6272/ad34aa","url":null,"abstract":"\u0000 The development of a nanosecond discharge in a pin-to-pin gap filled with air at atmospheric pressure has been studied with high temporal and spatial resolutions from a breakdown start to the spark decay. Positive and negative nanosecond voltage pulses with an amplitude of tens kV were applied. Time-resolved images of the discharge development were taken with a four-channel ICCD camera. The minimum delay between the camera channels could be as short as 0.1 ns. This made it possible to study the gap breakdown process with subnanosecond resolution. It was observed that a wide-diameter streamer develops from the high-voltage pointed electrode. The ionization processes near the grounded pin electrode started when the streamer crossed half of the gap. After bridging the gap by the streamer, a diffuse discharge was formed. The development of spark leaders from bright spots on the surface of the pointed electrodes was observed at the next stage. It was found that the rate of development of the spark leader is an order of magnitude lower than that of the wide-diameter streamer. Long thin luminous tracks were observed against the background of a discharge plasma glow. It has been established that the tracks are adjacent to brightly glowing spots on the electrodes and are associated with the flight of small particles.","PeriodicalId":506986,"journal":{"name":"Plasma Science and Technology","volume":"95 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140236604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast synthesis of gold nanoparticles by cold atmospheric pressure plasma jet in the presence of Au+ ions and a capping agent 在 Au+ 离子和封盖剂存在下通过冷大气压等离子体射流快速合成金纳米粒子

Plasma Science and Technology Pub Date : 2024-03-15 DOI: 10.1088/2058-6272/ad3499

T. Habib, J. A. M. Caiut, Bruno Caillier

{"title":"Fast synthesis of gold nanoparticles by cold atmospheric pressure plasma jet in the presence of Au+ ions and a capping agent","authors":"T. Habib, J. A. M. Caiut, Bruno Caillier","doi":"10.1088/2058-6272/ad3499","DOIUrl":"https://doi.org/10.1088/2058-6272/ad3499","url":null,"abstract":"\u0000 Homogeneous gold nanoparticles were synthesized under atmospheric pressure using a non-thermal helium plasma jet in a single-step process. A current power supply was used to generate the plasma discharge rich in diverse reactive species. These species induce rapid chemical reactions responsible for the reduction of the gold salts upon contact with the liquid solution. In this study, spherical and monodispersed gold nanoparticles were obtained within 5 min of plasma exposure using a solution containing Gold (III) chloride hydrate (HAuCl4) as a precursor and Polyvinylpyrrolidone (PVP) as a capping agent to inhibit agglomerations. The formation of these metal nanoparticles was initially perceptible through a visible change in the sample’s color, transitioning from light yellow to a red/pink color. This was subsequently corroborated by UV-vis spectroscopy, which revealed an optical absorption in the 520 - 550 nm range for AuNPs, corresponding to the surface plasmon resonance (SPR) band. An investigation into the impact of various parameters, including plasma discharge duration, precursor and capping agent concentrations, was carried out to optimize conditions for the formation of well-separated, spherical gold nanoparticles. Dynamic light scattering (DLS) was used to measure the size of these nanoparticles, transmission electron microscopy (TEM) was used to observe their morphology and X-ray diffraction (XRD) was also employed to determine their crystallographic structure. The results confirm that homogeneous spherical gold nanoparticles with an average diameter of 13 nm can be easily synthesized through a rapid, straightforward, and environmentally friendly approach utilizing a helium atmospheric pressure plasma.","PeriodicalId":506986,"journal":{"name":"Plasma Science and Technology","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140241251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reconfigurable (4, 6²) and (4, 8²) Archimedean Plasma Photonic Crystals in Dielectric Barrier Discharge 介质势垒放电中可重构的 (4, 6²) 和 (4, 8²) 阿基米德等离子体光子晶体

Plasma Science and Technology Pub Date : 2024-03-14 DOI: 10.1088/2058-6272/ad341f

Rui Li, Qi-han Wang, Fucheng Liu, Kuangya Gao, Xiaohan Hou, Mengmeng Jia, Qing Li, Weili Fan

引用次数: 0

Research on the deconvolution algorithm for the laser-induced fluorescence diagnosis based on the maximum entropy principle 基于最大熵原理的激光诱导荧光诊断解卷积算法研究

Plasma Science and Technology Pub Date : 2024-03-14 DOI: 10.1088/2058-6272/ad3420

Qingyun Lei, Xiong Yang, M. Cheng, Fan Zhang, D. Guo, Xiaokang Li, Wenjie Xiao

{"title":"Research on the deconvolution algorithm for the laser-induced fluorescence diagnosis based on the maximum entropy principle","authors":"Qingyun Lei, Xiong Yang, M. Cheng, Fan Zhang, D. Guo, Xiaokang Li, Wenjie Xiao","doi":"10.1088/2058-6272/ad3420","DOIUrl":"https://doi.org/10.1088/2058-6272/ad3420","url":null,"abstract":"\u0000 Laser-induced fluorescence (LIF) spectroscopy is employed for plasma diagnosis, necessitating the utilization of deconvolution algorithms to isolate the Doppler effect from the raw spectral signal. However, direct deconvolution becomes invalid in the presence of noise as it leads to infinite amplification of high-frequency noise components. To address this issue, we propose a deconvolution algorithm based on the maximum entropy principle. We validate the effectiveness of the proposed algorithm by utilizing simulated LIF spectra at various noise levels (signal-to-noise ratio, SNR = 20–80 dB) and measured LIF spectra with Xe as the working fluid. In the typical measured spectrum (SNR = 26.23 dB) experiment, compared with the Gaussian filter and the Richardson-Lucy (R-L) algorithm, the proposed algorithm demonstrates an increase in SNR by 1.39 dB and 4.66 dB respectively, along with a reduction in root-mean-square error (RMSE) by 35% and 64% respectively. Additionally, there is a decrease in spectral angle (SA) by 0.05 and 0.11 respectively. In the high quality spectrum (SNR = 43.96 dB) experiment, the results show that the running time of the proposed algorithm is reduced by about 98% compared with the R-L iterative algorithm. Moreover, the maximum entropy algorithm avoids parameter optimization settings and is more suitable for automatic implementation. In conclusion, the proposed algorithm can accurately resolve Doppler spectrum details while effectively suppressing noise, thus highlighting its advantage in LIF spectral deconvolution applications.","PeriodicalId":506986,"journal":{"name":"Plasma Science and Technology","volume":"66 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140242403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of magnetic field design for Hall thrusters based on a genetic algorithm 基于遗传算法的霍尔推进器磁场优化设计

Plasma Science and Technology Pub Date : 2024-03-11 DOI: 10.1088/2058-6272/ad3286

Rui Tan, Guanrong Hang, Pingyang Wang

引用次数: 0