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2008 IEEE 35th International Conference on Plasma Science最新文献

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Fabrication of multi-purpose probe to investigate the influence of ohmic magnetic field on density gradient in plasma 制作多用途探针,研究欧姆磁场对等离子体密度梯度的影响
Pub Date : 2017-03-30 DOI: 10.1063/1.4978829
M. Lafouti, M. Ghoranneviss, S. Meshkani
Small tokamak is a device in which can provide the suitable situations to investigate the parameters in which can effect on plasma confinement. So the large number of experiments on plasma have been done In many tokamaks. And for obtain the data with more precision, novel diagnostics have been designed and constructed. In this paper the effect of ohmic magnetic field magnitude on radial particle flux and radial density gradient have been investigated. For this purpose a Multi-Purpose Probe (MPP) have been designed and constructed in IR-T1 tokamak. MPP has three parts in which can measured magnetic fluctuation, the radial particle flux fluctuation, ion saturation current, plasma density gradients, floating potential, radial and poloidal electric field and Mach number. The results have been shown that the ohmic magnetic field magnitude is important factor in plasma confinement. It can decrease the radial gradient density in which is one of the source of radial turbulence. We took Fast Fourier Transform (FFT...
小型托卡马克为研究影响等离子体约束的参数提供了合适的条件。因此,大量的等离子体实验已经在许多托卡马克中完成。为了更精确地获取数据,设计和构造了新的诊断方法。本文研究了欧姆磁场大小对径向粒子通量和径向密度梯度的影响。为此,在IR-T1托卡马克中设计并制造了多用途探针(MPP)。MPP有三个部分,可以测量磁波动、径向粒子通量波动、离子饱和电流、等离子体密度梯度、浮动电位、径向和极向电场和马赫数。结果表明,欧姆磁场大小是影响等离子体约束的重要因素。它可以降低径向梯度密度,而径向梯度密度是径向湍流的来源之一。我们用快速傅里叶变换(FFT)
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引用次数: 0
Replaceable electrodes triggered vacuum switch and its application in lightning current component A generator 可替换电极触发真空开关及其在雷击电流分量A发电机中的应用
Pub Date : 2016-06-19 DOI: 10.1109/PLASMA.2016.7534407
Sun Jinru, Y. Xueling, X. Wenjun, C. Jingliang
Lightning can cause severe damage to aircraft, lightning direct effect test is very important for research of spacecraft material, design of structure of aircraft, but the limitation of the measuring technology and special test apparatus has become the technical bottleneck. Lightning current components for lightning direct effect test consist of component A (initial strode), component B (Intermediate current), component C (Continuing current) and component D (Restrike). Lightning current components A and D can be produced by the type of RLC circuit and crowbar circuit. The efficiency of the conventional RLC circuit in generating long duration time impulse current wave is relative low. To solve this problem, a replaceable electrodes triggered vacuum switch is designed and researched and then a high efficiency crowbar circuit which produces lightning current component A is designed in this paper.
雷电会对飞行器造成严重的破坏,雷电直接效应试验对航天器材料研究、飞行器结构设计具有重要意义,但测量技术和专用试验装置的限制已成为技术瓶颈。雷电直接效应试验的雷电电流分量由A分量(初跨)、B分量(中间电流)、C分量(持续电流)和D分量(重击)组成。雷电电流分量A和D可由RLC电路和撬棍电路两种类型产生。传统的RLC电路产生长时间脉冲电流波的效率相对较低。为了解决这一问题,本文设计研究了一种可更换电极触发真空开关,并在此基础上设计了一种产生雷电电流分量a的高效撬棍电路。
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引用次数: 0
Effects of nanosecond pulsed electromagnetic field on mitochondrial membrane potential 纳秒脉冲电磁场对线粒体膜电位的影响
Pub Date : 2016-06-19 DOI: 10.1109/PLASMA.2016.7534132
X. Wenjun, Y. Xueling, C. Jingliang
In this paper, the effects of nanosecond pulsed electromagnetic field (NPEMF) on mitochondrial membrane potential were studied. The pulsed electromagnetic field was induced by a pulsed square wave with adjustable frequency of 0∼100Hz. The rise time was less than 10ns and the duration time was 100ns. The testing amplitude of NPEMF was from 0.10mT to 1.30mT, and the frequency was 5Hz, 10 Hz, 30 Hz, 50Hz respectively. It was applied on human prostate cancer cells (PC3) under 23 °C experiment temperature and 2 hours exposed time. When the frequency was 30Hz, the experimental results showed the mitochondrial membrane potential value decreased after irradiation compared to the control group. However the relationship between mitochondrial membrane potential and NPEMF is nonlinear. T he potential was smallest when the amplitude of NPEMF was 0.44mT. When the amplitude of NPEMF is constant, the mitochondrial membrane potential increased with the increase of frequency. The value of exposed group was larger than control group 2(23 C, no irradiation). It showed that the electromagnetic field could reduce the damage caused by low temperature.
研究了纳秒脉冲电磁场(NPEMF)对线粒体膜电位的影响。脉冲电磁场由频率为0 ~ 100Hz的脉冲方波产生。上升时间小于10ns,持续时间为100ns。NPEMF的测试幅值为0.10 ~ 1.30mT,频率分别为5Hz、10 Hz、30 Hz、50Hz。将其作用于人前列腺癌细胞(PC3),实验温度23℃,暴露时间2小时。当频率为30Hz时,实验结果显示辐照后线粒体膜电位值较对照组降低。然而,线粒体膜电位与NPEMF之间的关系是非线性的。当NPEMF振幅为0.44mT时,电位最小。当NPEMF振幅一定时,线粒体膜电位随频率的增加而增加。暴露组高于对照组2(23℃,未辐照)。结果表明,电磁场可以降低低温对材料的损伤。
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引用次数: 0
Effects of plasma treated water on plants 等离子体处理水对植物的影响
Pub Date : 2012-07-08 DOI: 10.1109/PLASMA.2012.6383483
D. Park, D. Dobrynin, G. Fridman, A. Fridman
Summary form only given. Water quality, its mineralization and chemical composition, particularly pH and nitrogen compounds, play crucial role in plant's development and growth. Treatment of water with plasma results in change of its properties and chemical composition, which in turn may affect plant growth process and subsequently agriculture produce quality.
只提供摘要形式。水质及其矿化度和化学成分,特别是pH和氮化合物,对植物的发育和生长起着至关重要的作用。用等离子体处理水会改变水的性质和化学成分,从而影响植物生长过程,进而影响农产品质量。
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引用次数: 2
Numerical studies on plasma bullet propagation and its inhibition in helium plasma jet at atmospheric pressure 大气压下氦等离子体射流中等离子体子弹传播及其抑制的数值研究
Pub Date : 2012-07-08 DOI: 10.1109/PLASMA.2012.6383300
Fucheng Liu, W. Yan, Dezhen Wang
Summary form only given. Over the past years cold atmospheric pressure plasma jets (CAPPJ) have received considerable attention due to their unique capabilities and considerable application potentials in various industrial and scientific applications. It has been demonstrated by several research groups that CAPPJs are not continuous jets but discrete fast-moving plasma bullets with supersonic velocities in the order of104–105m/s. However, possible mechanisms responsible for the creation and propagation of plasma bullets still remain essentially open. Presently two explanations for this phenomenon exist. One is the ionization wave model, and the other is the streamer-like model based on photo-ionization.
只提供摘要形式。近年来,冷大气压等离子体射流(CAPPJ)以其独特的性能和巨大的应用潜力在各种工业和科学应用中受到了广泛的关注。几个研究小组已经证明,CAPPJs不是连续的射流,而是以104 - 105m/s的超音速速度离散快速移动的等离子体子弹。然而,产生和传播等离子体子弹的可能机制基本上仍然是开放的。目前对这一现象有两种解释。一种是电离波模型,另一种是基于光电离的类流模型。
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引用次数: 0
Description of plasma bullet in plasma jet in terms of wave-packet of plasma diffusion 从等离子体扩散波包的角度描述等离子体射流中的等离子体子弹
Pub Date : 2012-07-08 DOI: 10.1109/PLASMA.2012.6383846
G. Cho, E. Choi, H. Uhm
Summary form only given. The propagation of plasma bullet in a plasma jet is described under the base of fluid theory of plasma diffusion and plasma drift as well as the gas flow. The origin of plasma bullet is analyzed to be the electrostatic plasma diffusion wave propagating in the plasma column of plasma jets. The plasma diffusion waves, electron wave as well as ion wave, propagate as the form of wave-packet modulated to the operation frequency of voltage pulse. The waves have the dispersion relation of ω∼(u d +u b +u n )k where the phase velocity is the addition of fluid such as drift velocity u d , gas blowing velocity u b , and plasma diffusion velocity u n . The waves are modulated to be the wave-packet of dω∼u g dk with the group velocity u g ∼c s 2/u n ∼(104–105) m/s where the acoustic velocity is c s ∼103 m/s and the diffusion velocity is u n ∼(10–102) m/s estimated in a plasma jet device. The plasma diffusion wave propagates resistively against the slope of plasma density gradient1.
只提供摘要形式。从等离子体扩散、等离子体漂移和气体流动的流体理论出发,描述了等离子体子弹在等离子体射流中的传播。分析了等离子体弹的起源是在等离子体射流的等离子体柱中传播的静电等离子体扩散波。等离子体扩散波、电子波和离子波以调制到电压脉冲工作频率的波包形式传播。波具有ω ~ (u d +u b +u n)k的色散关系,其中相速度为流体的添加,如漂移速度u d,气体吹速u b和等离子体扩散速度u n。在等离子体射流装置中,波被调制成波包为ω ~ u g dk,群速度为u g ~ c s 2/u n ~ (104-105) m/s,其中声速为c s ~ 103 m/s,扩散速度为u n ~ (10-102) m/s。等离子体扩散波沿等离子体密度梯度的斜率呈电阻性传播。
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引用次数: 0
Visualization of instabilities in hot magnetized plasmas by ECE Imaging 热磁化等离子体不稳定性的ECE成像可视化
Pub Date : 2012-07-08 DOI: 10.1109/PLASMA.2012.6384081
A. Donne, A. Bogomolov, J. Boom, I. Classen, B. Tobias, N. Luhmann, C. Domier, G. Yun, Woochang Lee, H. Park
Summary form only given. Electron cyclotron emission radiometry is a standard technique on most magnetically confined plasmas to measure the electron temperature profile, usually along the plasma mid plane. By combining heterodyne radiometry with optical imaging techniques it is possible to measure the electron temperature and fluctuations in this quantity in a two-dimensional section of the poloidal plasma plane.
只提供摘要形式。电子回旋辐射测量是大多数磁约束等离子体测量电子温度分布的标准技术,通常沿等离子体中平面测量。通过将外差辐射测量法与光学成像技术相结合,可以在极向等离子体平面的二维截面上测量电子温度和该量的波动。
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引用次数: 0
Numerical simulation of nonthermal atmospheric pressure plasma jet and comparison with experiments 非热大气压等离子体射流的数值模拟与实验比较
Pub Date : 2012-07-08 DOI: 10.1109/PLASMA.2012.6383660
W. Ning, Lijun Wang, S. Jia, Mingzheng Fu, Z. Shi, Xingwen Li
Summary form only given. This paper presents a computational study of point-to-plane atmospheric helium plasma discharge. We employed a two-dimensional, axisymmetric fluid model to investigate the time-dependent characters of the discharge. Helium with small amount of nitrogen (impurity) was used as the working gas. The gap distance between the two electrodes was varied from 1mm to 15mm. The magnitude of the applied voltage's amplitude was in the range of 1kV∼10kV, and the frequency was 10 kHz. The coupled continuity equations for particles and electron energy equation were solved with the Poisson' equation using the finite element method with unstructured grids. Simulation results showed that the plasma needle operated as the corona discharge at low power and the mode transferred to glow discharge as the power surpassed certain critical value, and this value decreased either the frequency increased or the gap distance decreased. Furthermore, the simulation results were compared with the experimental results. The results showed that simulation results were in reasonable agreement with experiments.
只提供摘要形式。本文对大气氦等离子体点对面放电进行了计算研究。我们采用二维轴对称流体模型来研究放电的时变特性。工作气体采用氦和少量氮(杂质)。两个电极之间的间隙距离从1mm到15mm不等。施加电压的幅值范围为1kV ~ 10kV,频率为10khz。采用非结构网格有限元法,用泊松方程求解了粒子和电子能量的耦合连续性方程。仿真结果表明,等离子体针在低功率下以电晕放电方式工作,当功率超过某一临界值时模式转变为辉光放电,该临界值随着频率的增加或间隙距离的减小而减小。并将仿真结果与实验结果进行了比较。结果表明,仿真结果与实验结果吻合较好。
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引用次数: 0
Structural phase transitions in the strongly coupled systems with isotropic potentials 具有各向同性势的强耦合体系中的结构相变
Pub Date : 2012-07-08 DOI: 10.1109/PLASMA.2012.6383583
E. Vasilieva, O. Vaulina
Summary form only given. Study of structural phase transitions is of significant interest with fundamental point of view and, at present time, it is a subject of the intensive theoretical and experimental researches in various areas of physics. Such transitions are the phase transformations (of configuration, topology, polymorphic, or solid-liquid transitions) in strongly coupled systems, which consist in a structure reorganization of these systems and, in most cases, lead to a change of their symmetry type. Besides fundamental aspects, study of structural phase transitions is of special interest for development of nano- and micro- technologies, and of covers and materials with the defined properties.
只提供摘要形式。结构相变的研究具有重要的基础观点,是目前物理学各个领域理论和实验研究的热点。这种转变是强耦合系统中的相变(构型、拓扑、多态或固液转变),它包含在这些系统的结构重组中,并且在大多数情况下导致其对称类型的变化。除了基础方面之外,结构相变的研究对于纳米和微技术的发展以及具有特定性能的覆盖物和材料具有特殊的意义。
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引用次数: 0
Plasma creation by a powerful electromagnetic radiation of terahertz gyrotrons 由太赫兹回旋管的强大电磁辐射产生的等离子体
Pub Date : 2011-06-26 DOI: 10.1109/PLASMA.2011.5992895
V. Bratman, Y. Kalynov, V. A. Koldanov, A. Litvak, S. Razin, A. Sidorov, V. Skalyga, V. Zorin
Summary from only given. The study of the discharge in a focused beam of terahertz radiation in argon at pressures close to atmospheric was made. The range of breakdown electric fields and gas pressures at which the discharge occurs was determined. Discharge, had started at the focus of the beam, propagated in the region of weak fields, where the value of the intensity was substantially less than the breakdown one. The investigation of the discharge glow dynamics was made and it was shown that its front had moved towards the radiation with the speed of about 105 cm/sec. The estimation of the plasma density was made on the basis of the terahertz wave transmission coefficient measurements, and the value of the density exceeded the value of 1015 cm-3. The features of the discharge excited by radiation of the terahertz frequency range and its possible applications are discussed.
摘要仅供参考。对氩气中太赫兹辐射聚焦束在接近大气压力下的放电进行了研究。确定了发生放电的击穿电场和气体压力的范围。放电从光束的焦点处开始,在弱场区域传播,在弱场区域的强度值基本上小于击穿的强度值。对放电辉光动力学进行了研究,结果表明,放电辉光的锋面以约105 cm/s的速度向辐射方向移动。在太赫兹波透射系数测量的基础上对等离子体密度进行了估计,密度值超过了1015 cm-3。讨论了太赫兹辐射激发放电的特性及其可能的应用。
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引用次数: 0
期刊
2008 IEEE 35th International Conference on Plasma Science
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