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2017 IEEE International Conference on Plasma Science (ICOPS)最新文献

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Multi-Beam MTM High Power Microwave Source 多波束MTM大功率微波源
Pub Date : 2017-05-01 DOI: 10.1109/PLASMA.2017.8496234
A. Elfrgani, H. Seidfaraji, E. Schamiloglu
Microwave sources transform the kinetic energy of an electron beam into microwaves through the interaction of the electrons with a periodic slow wave structure (SWS). A metamaterial (MTM) waveguide is proposed for use in a microwave oscillator instead of a SWS, which have been used for a long time to generate high power. MTMs have interesting properties such as negative refractive index, low group velocity, below cut-off propagation, among others.
微波源通过电子与周期性慢波结构(SWS)的相互作用将电子束的动能转化为微波。提出了一种用于微波振荡器的超材料波导(MTM),以取代长期以来用于产生高功率的SWS。mtm具有一些有趣的特性,如负折射率、低群速度、低于截止点传播等。
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引用次数: 1
Synthesising Nanofluids Using Laser Induced Plasma 利用激光诱导等离子体合成纳米流体
Pub Date : 2017-05-01 DOI: 10.1109/PLASMA.2017.8496131
M. Thiyagarajan
Nanofluids hold enhanced physical, chemical, thermal and transport characteristics compared to the base fluids, which signify a great potential for a variety of applications including combustion, liquid propellant, microelectronics, optical and thermal emission devices, energy storage, heat exchanger-cooling systems, hydrogen generation, nuclear safety, and in underwater and military applications. Nanofluids are a new class of fluids engineered by dispersing nanoparticles of size less than 100 nm in base fluids.
与基础流体相比,纳米流体具有更强的物理、化学、热学和输运特性,这意味着纳米流体在各种应用领域具有巨大的潜力,包括燃烧、液体推进剂、微电子、光学和热发射装置、储能、热交换冷却系统、制氢、核安全以及水下和军事应用。纳米流体是一种新型流体,它将小于100纳米的纳米颗粒分散在基础流体中。
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引用次数: 0
3D Printed Mini Plasma Jet: Application To Hemostatic Treatment For Endoscope 3D打印迷你等离子射流:在内窥镜止血治疗中的应用
Pub Date : 2017-05-01 DOI: 10.1109/PLASMA.2017.8496372
Y. Hayashi, H. Kawano, H. Miyahara, A. Okino, Yudai Nomura, T. Takamatsu, Takeshi Azuma, Syosaku Ota
In the medical field, demand for endoscopes has been increasing not only for examination but also for minimally invasive treatment. For endoscopic hemostasis, clips and plasma devices called Argon Plasma Coagulation (APC) are widely used. Although APC has a short hemostasis time, there is a problem with a tissue that is thermally damaged by high plasma temperature. Meanwhile, promotion of blood coagulation by atmospheric low temperature plasma has been reported. Blood points irradiated with the plasma can clot without thermal damage and stop bleeding. Therefore, applying atmospheric low temperature plasma to endoscopic hemostasis can be expected as a minimally invasive hemostatic method. For that purpose, a mini plasma source that can be inserted into a forceps port of endoscope is required. However, conventional plasma source had been manufactured by machining, there was limitation for miniaturization.
在医疗领域,对内窥镜的需求越来越大,不仅用于检查,而且用于微创治疗。对于内窥镜止血,广泛使用夹子和称为氩等离子凝固(APC)的等离子装置。虽然APC止血时间短,但存在一个问题,即组织被高血浆温度热损伤。同时,大气低温血浆促进凝血的研究也有报道。用血浆照射的血点可以凝结而不产生热损伤并止血。因此,将常压低温等离子体应用于内镜下止血,有望成为一种微创止血方法。为此,需要一个可以插入内窥镜钳口的小型等离子体源。然而,传统的等离子体源是通过机械加工制造的,在小型化方面存在局限性。
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引用次数: 0
Preparation Of Graphene Oxide/Conducting Polymer Nanocomposites By Rf-Plasma Polymerization 射频等离子体聚合制备氧化石墨烯/导电聚合物纳米复合材料
Pub Date : 2017-05-01 DOI: 10.1109/PLASMA.2017.8496232
Sadık Çoğal, Gamze Celik Cogal, A. Oksuz
Over the last ten years, graphene has been found significant attention in both academic and industrial research due to its excellent properties include electrical conductivity, thermal stability, large surface area and mechanical strength 1. Graphene oxide, as a derivative of graphene, has been widely investigated material due to functional groups located on its basal and edge structure. On the other hand, conducting polymers are also know as synthetic metals have received a central importance in materials research due to their unique properties 2. The researchers have studied the composites of graphene oxide and conducting polymers. These composites have exhibited a synergic effect leading to significant enhancements in their properties, which are not observed in each component.
在过去的十年里,石墨烯由于其优异的性能,包括导电性、热稳定性、大表面积和机械强度,在学术和工业研究中都受到了极大的关注。氧化石墨烯作为石墨烯的衍生物,由于其基底和边缘结构上都有官能团,因此受到了广泛的研究。另一方面,导电聚合物也被称为合成金属,由于其独特的性质,在材料研究中占有重要地位。研究人员研究了氧化石墨烯和导电聚合物的复合材料。这些复合材料表现出协同效应,导致其性能显著增强,这在每个组分中都没有观察到。
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引用次数: 0
Self-Consistent Numerical Simulation of Carbon Arc for Nanoparticle Synthesis 纳米颗粒合成碳弧自洽数值模拟
Pub Date : 2017-05-01 DOI: 10.1109/PLASMA.2017.8496331
A. Khrabry, A. Khodak, I. Kaganovich, Vladislav Vekselman, V. Nemchinsky
Self-consistent model of atmospheric pressure carbon arc discharge in helium atmosphere was developed in the framework of the nanoparticle synthesis project1 and implemented into the 3D CFD-code ANSYS CFX, which was highly customized for this purpose. Arc discharge model consists of fluid model for non-equilibrium plasma coupled with models of heat transfer in electrodes, ablation of anode, carbon deposition at cathode and space charge sheathes.
在纳米粒子合成项目框架下,开发了氦气氛下常压碳弧放电自一致模型1,并实现到为此高度定制的三维cfd代码ANSYS CFX中。电弧放电模型由非平衡等离子体流体模型、电极传热模型、阳极烧蚀模型、阴极积碳模型和空间电荷鞘模型组成。
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引用次数: 1
Large Scale Optimization of RF Devices 射频器件的大规模优化
Pub Date : 2017-05-01 DOI: 10.1109/PLASMA.2017.8496324
A. Jensen, J. Petillo, S. Ovtchinnikov, A. Burke, D. Panagos, C. Kostas, G. Stantchev, S. Cooke
The design cycle of RF devices is greatly facilitated by the use of the “virtual prototyping” methodology based on highfidelity computer simulations that are capable of predicting the RF device’s performance in response to changes in its physical parameters. In particular, parameters such as the critical dimensions of the structure or the quantitative properties of its various electromagnetic components are routinely used in the process of optimizing the desired performance characteristics of the RF device. In a typical optimization workflow these parameters are adjusted manually and the simulation code(s) run repeatedly with varying parameter values until desired design criteria are met. This type of process, however, is well suited to semisupervised global optimization. To this end we have integrated several codes including Capstone 1and MICHELLE 2with our recently developed framework prototype for high-performance RF device optimization based on DAKOTA 3and the parallel code deployment and management tool, Galaxy Simulation Builder (GSB 4. We present results from several RF device design studies- based on this extended framework and demonstrate how this approach can help automate and significantly accelerate the geometric parameter search, and ultimately improve the accuracy and efficiency of the RF device design cycle.
使用基于高保真计算机模拟的“虚拟原型”方法大大促进了射频设备的设计周期,该方法能够预测射频设备的性能,以响应其物理参数的变化。特别是,在优化射频器件所需性能特性的过程中,通常会使用诸如结构的关键尺寸或其各种电磁元件的定量特性等参数。在典型的优化工作流程中,这些参数是手动调整的,并且模拟代码以不同的参数值反复运行,直到满足所需的设计标准。然而,这种类型的过程非常适合半监督全局优化。为此,我们将包括Capstone 1和MICHELLE 2在内的几个代码与我们最近开发的基于DAKOTA 3和并行代码部署和管理工具Galaxy Simulation Builder (GSB 4)的高性能射频器件优化框架原型集成在一起。我们介绍了几项基于此扩展框架的射频器件设计研究的结果,并展示了这种方法如何帮助自动化和显着加速几何参数搜索,并最终提高射频器件设计周期的准确性和效率。
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引用次数: 1
Hydrogen Peroxide Formation at Plasma-water Interface under Positive Dc Streamer and Pulsed Corona Discharge 正直流流光和脉冲电晕放电下等离子体-水界面过氧化氢的形成
Pub Date : 2017-05-01 DOI: 10.1109/PLASMA.2017.8496030
Y. Zhao, Tao Wang, S. Macgregor, Mark P. Wilson, I. Timoshkin
Plasma-induced advanced oxidation processes (AOPs) have been widely investigated [1, 2] due to its ability to generate reactive species such as H2O2 and OH radicals [3]. A pin-towater electrode system was employed to investigate the reaction mechanisms at the plasma-water interface, with water used as the ground electrode under both static and flowing conditions. The formation of H2O2 in water was quantified by the spectrophotometric method, using potassium titanium (IV) oxalate. Tert-butanol was used as an OH radical scavenger, to stop the dimerization of OH radicals into H2O2.
等离子体诱导的高级氧化过程(AOPs)因其能够产生H2O2和OH自由基[3]等活性物质而被广泛研究[1,2]。采用针脚-水电极系统研究了等离子体-水界面的反应机理,在静态和流动条件下,水作为接地电极。采用草酸钛钾分光光度法定量测定水中H2O2的生成。叔丁醇作为OH自由基清除剂,阻止OH自由基二聚化成H2O2。
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引用次数: 0
Beam Profile And Position Instability Of A Post-Accelerated Pseudospark-Sourced Electron Beam For An Extended Interaction Oscillator 扩展相互作用振荡器后加速伪火花源电子束的束形和位置不稳定性
Pub Date : 2017-05-01 DOI: 10.1109/PLASMA.2017.8495999
A. Cross, H. Yin, L. Zhang, W. He, G. Shu, K. Ronald, A. Phelps, J. Zhao, Y. Yin
The pseudospark discharge is a low-pressure gas discharge, that can generate extremely high currents within short rise times using a special hollow cathode structure 1, 2. The highquality electron beam has high current density and brightness and the ability to self-focus via ion channel focusing 3. Simulations have shown the pseudospark-sourced electron beam can propagate within background plasma of density $10 ^{14}- 10 ^{16} mathrm {m}^{-3}$ with no applied guiding magnetic field 4, making it excellent for millimeter-wave generation 5. Singleshot electron beam pulses were imaged by a CCD camera measuring light emitted by electron beam impact on $mathrm {a}50 mu mathrm {m}$ thickness stopping copper foil and phosphor screen. The high energy component beam profile has a Lorentzian distribution much smaller than the axial aperture size.
假火花放电是一种低压气体放电,使用特殊的空心阴极结构,可以在短上升时间内产生极高的电流1,2。高质量电子束具有高电流密度、高亮度和通过离子通道聚焦的自聚焦能力。仿真结果表明,伪火花源电子束可以在密度为$10 ^{14}~ $10 ^{16}mathrm {m}^{-3}$的背景等离子体中传播,无需施加引导磁场4,使其具有良好的毫米波产生5。利用CCD相机测量电子束撞击50 μ m厚度的铜箔和荧光粉屏所发出的光,对单次发射的电子束脉冲进行成像。高能分量光束的洛伦兹分布比轴向孔径小得多。
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引用次数: 0
Development Of Pulsed Pinch Plasmas For The Application As Fair Plasma Stripper* 应用于公平等离子体剥离器的脉冲捏缩等离子体的发展*
Pub Date : 2017-05-01 DOI: 10.1109/PLASMA.2017.8496371
M. Iberler, T. Ackermann, B. Bohlender, K. Cistakov, C. Hock, D. Mann, G. Xu, J. Wiechula, J. Jacoby
The Facility for Antiproton and Ion Research (FAIR) is a new international accelerator laboratory at the GSI in Darmstadt, Germany. The main topic at this facility is aimed to heavy ion research. The FAIR project in comparison to the existing facility GSI extends the research area by raising the energy of heavy ion beams. The demand for acceleration of the beam to the highest possible energy is a highly ionized charge state of the Ion beam. For beam stripping to get higher charge state, the traditional tools are foil stripper and gas stripper. Hence pulsed Plasma is suggested to be a stripper medium. In Frankfurt are different kinds of Pinch Plasmas under investigation for this application. One is a Spherical Theta Pinch and the other a hollow cathode Screw Pinch 1. The screw pinch plasma consists of a superposition of a linear Zpinch and a Theta pinch. The constricting effect on the plasma or conductor is produced by the magnetic field pressure resulting from the magnetic field of the linear current and magnetic field of the coil. The device operates at a frequency of approximate 14 kHz and with a capacity of $34 mu mathrm {F}$. This contribution gives the first results of the transfer efficiency and optical investigations of pulsed the screw pinch compared to a theta pinch 2. In addition first measurements of beam time experiments at GSI will be presented.
反质子和离子研究设施(FAIR)是位于德国达姆施塔特GSI的一个新的国际加速器实验室。该设施的主要课题是重离子研究。与GSI现有设施相比,FAIR项目通过提高重离子束的能量扩展了研究领域。离子束加速到最高可能能量的要求是离子束的高度电离电荷状态。为了使束流汽提得到更高的电荷状态,传统的汽提工具是箔汽提器和气体汽提器。因此,脉冲等离子体被认为是一种剥离介质。在法兰克福,不同种类的夹捏等离子体正在为此应用进行研究。一个是球面θ捏捏和另一个空心阴极螺旋捏捏1。螺旋捏缩等离子体由线性z捏缩和θ捏缩的叠加组成。对等离子体或导体的收缩效应是由线性电流的磁场和线圈的磁场产生的磁场压力产生的。该器件工作频率约为14khz,容量为$34 mu mathm {F}$。这一贡献给出了第一个结果的传递效率和光学研究的脉冲螺旋捏捏相比,θ捏2。此外,还将介绍在GSI进行的光束时间实验的首次测量结果。
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引用次数: 0
Neon Plasma Jet Interactions With Conductive and Non-Conductive Targets 氖等离子体射流与导电和非导电目标的相互作用
Pub Date : 2017-05-01 DOI: 10.1109/PLASMA.2017.8496130
A. Kone, B. Caillier, C. Muja, F. Sainct, P. Guillot
In last decades, atmospheric pressure plasma jets (APPJs) have been extensively studied, mainly due to their potential for biomedical applications and analytical chemistry. Working gas and voltage profiles have been identified as the main parameters which influence the plasma characteristics. Recently, it has been demonstrated that the nature of the target in front of the plasma jet modifies the plasma discharge1. The aim of this work is to investigate the influence of a conductive target (copper plate) and nonconductive target (glass plate) on a neon plasma jet characteristics.
在过去的几十年里,大气压等离子体射流(APPJs)得到了广泛的研究,主要是因为它们在生物医学和分析化学方面的应用潜力。工作气体和电压分布是影响等离子体特性的主要参数。最近有研究表明,等离子体射流前方目标的性质改变了等离子体放电1。本文研究了导电靶(铜板)和非导电靶(玻璃板)对氖等离子体射流特性的影响。
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引用次数: 1
期刊
2017 IEEE International Conference on Plasma Science (ICOPS)
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