2022 IEEE International Conference on Plasma Science (ICOPS)最新文献_第4页

Microgravity Dusty Plasmas Exhibit Properties Of Liquid Crystals 微重力尘埃等离子体表现出液晶的特性

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813252

E. Kostadinova, E. Gehr, E. Guay, L. S. Matthews, T. Hyde

{"title":"Microgravity Dusty Plasmas Exhibit Properties Of Liquid Crystals","authors":"E. Kostadinova, E. Gehr, E. Guay, L. S. Matthews, T. Hyde","doi":"10.1109/ICOPS45751.2022.9813252","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813252","url":null,"abstract":"This study examines structure and stability of filamentary dusty plasmas using data from the Plasmakristall-4 (PK-4) facility on board the International Space Station. Microgravity dusty plasmas have been observed to form extended field-aligned filaments in the DC discharge of the PK-4 experiments, which have been compared to the filamentary state in electrorheological (ER) fluids. Here we show that analysis of the filamentary state of dusty plasma suggests that meaningful comparisons can be made between these microgravity structures and liquid crystals (LCs) with rod-shaped molecules. Specifically, we demonstrate that the coupling between dust particles within filaments is crystal-like, while the coupling across filaments is liquid-like. In addition to a common orientation along a director axis (nematic behavior), the dust filaments also appear to align in large-scale nested structures, or shells (smectic behavior). Finally, the dust filaments are found to arrange in hexagonal patterns in the plane perpendicular to their director axis, suggesting the possibility of a smectic-B or smectic-C state. Based on these observations, we will argue that microgravity filamentary dusty plasmas can be used to study universality of phase transitions and pattern formation in liquid crystals.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127580770","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

Modeling Burn Physics in a Magnetized ICF Plasma 磁化ICF等离子体中的燃烧物理建模

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813321

S. O'Neill, B. Appelbe, J. Chittenden

{"title":"Modeling Burn Physics in a Magnetized ICF Plasma","authors":"S. O'Neill, B. Appelbe, J. Chittenden","doi":"10.1109/ICOPS45751.2022.9813321","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813321","url":null,"abstract":"The pre-magnetization of inertial confinement fusion capsules is a promising avenue for reaching hotspot ignition, as the magnetic field reduces electron thermal conduction losses during hotspot formation. However, in order to reach high yields, efficient burn-up of the cold fuel is vital. Suppression of heat flows out of the hotspot due to magnetization can restrict the propagation of burn and has been observed to reduce yields in previous studies [1] . This work investigates the potential suppression of burn in a magnetized plasma utilizing the radiation-MHD code ‘Chimera’ in a planar geometry.. This code includes extended-MHD effects, such as the Nernst term, and a Monte-Carlo model for magnetized alpha particle transport and heating. We observe 3 distinct regimes of magnetized burn in 1D as initial magnetization is increased: thermal conduction driven; alpha driven; and suppressed burn. Field transport due to extended-MHD is also observed to be important, enhancing magnetization near the burn front. In higher dimensions, burn front instabilities have the potential to degrade burn even more severely. Magneto-thermal type instabilities (previously observed in laser-heated plasmas [2] ) are of particular interest in this problem.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130967577","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

Particle-in-Cell Simulations of Nonlinear Plasma Sheath Effects on Impedance of VLF Antenna Operating in the Magnetosphere 非线性等离子体鞘层对VLF天线磁层阻抗影响的粒子胞内模拟

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813221

K. Shipman, P. Colestock, D. Svyatsky, M. Gilmore, Q. Marksteiner, G. Delzanno

{"title":"Particle-in-Cell Simulations of Nonlinear Plasma Sheath Effects on Impedance of VLF Antenna Operating in the Magnetosphere","authors":"K. Shipman, P. Colestock, D. Svyatsky, M. Gilmore, Q. Marksteiner, G. Delzanno","doi":"10.1109/ICOPS45751.2022.9813221","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813221","url":null,"abstract":"A powerful coronal mass ejection or a high-altitude nuclear explosion (HANE) can produce an artificial radiation belt containing high-energy electrons (~1MeV) in the earth’s upper atmosphere that would populate its magnetosphere. Some of these high-energy electrons become trapped along the Earth’s magnetic field lines and would severely damage or destroy nearly all lower-earth orbit (LEO) satellites in just a few days. Over the years, it has been of much interest to devise a scheme that remediates these MeV electrons from the magnetosphere and reduces the amount of damage caused by them. A proposed technique is to use a space-borne high-voltage dipole antenna to inject very low frequency (VLF) whistler waves (3-30kHz) along the earth’s magnetic field lines to precipitate the electrons through pitch angle scattering. Because the magnetosphere is composed of plasma, a charged antenna will form a nonlinear plasma sheath around its surface. This sheath changes the input impedance of the antenna, reducing efficiency. This research uses a three-dimensional electrostatic curvilinear particle-in-cell (CPIC) code to simulate the antenna-sheath interaction to calculate the impedance induced by the sheath. We compare the numerical results to an existing analytical developed by Balmain et al. and Song et al. [1] [2] .","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133601399","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

Production of Methyl Radicals in Atmospheric Pressure Microreactors for Up-Conversion to High Values Hydrocarbons 常压微反应器上转化高值烃甲基自由基的产生

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813290

S. Kerketta, K. Wolf, R. Hartman, M. Kushner

{"title":"Production of Methyl Radicals in Atmospheric Pressure Microreactors for Up-Conversion to High Values Hydrocarbons","authors":"S. Kerketta, K. Wolf, R. Hartman, M. Kushner","doi":"10.1109/ICOPS45751.2022.9813290","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813290","url":null,"abstract":"The on-site up-conversion of methane (CH 4 ) to higher value hydrocarbons is being investigated as a means to minimize the emission of global warming methane during oil production. One proposed method is production of methyl (CH 3 ) radials by a low temperature plasma, followed by reaction with organic metallic complexes in solution. Production of CH 3 radicals using dielectric barrier discharge (DBD) plasma microreactors is being computationally and experimentally investigated. A typical microreactor consists of a 500 μm gap etched on a Si substrate and covered with borosilicate glass as the dielectric. Nanosecond high voltage pulses of up to 10 kV operating at frequencies of 1-10 kHz were used to generate atmospheric pressure plasma in the feed gas consisting of mixtures of Ar and CH 4 . nonPDPSIM , a 2D plasma hydrodynamics model was used to simulate the plasma generation and subsequent plasma chemistry initiated by electron impact dissociation of CH 4 . The spatial and temporal evolution of CH 3 radicals will be discussed as a function of reactor geometry, gas mixture, and solvent location (e.g., along walls or in droplets). Although methyl radicals can be efficiently produced, there is also rapid formation of ethylene (C 2 H 6 ) in the gas phase. The location of CH 3 formation with respect to the solvent is therefore important in maximizing the solvation of the CH 3 radicals for further up-conversion.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132742234","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

Absence of Space-Charge-Limited Current from Abnormal Field Emission in Collisional Diode 碰撞二极管异常场发射中空间电荷限制电流的缺失

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813168

L. Ang, C. Chua, Y. Ang

{"title":"Absence of Space-Charge-Limited Current from Abnormal Field Emission in Collisional Diode","authors":"L. Ang, C. Chua, Y. Ang","doi":"10.1109/ICOPS45751.2022.9813168","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813168","url":null,"abstract":"For field emission in a vacuum or solid diode, its current density is expected to be governed by the Child-Langmuir [1] or Mott-Gurney laws [2] law at sufficiently high voltage. Recently, we reported that for field emission not obeying the classical Fowler-Nordheim (FN) law [3] , the two-stage transition from source-limited field emission (FE) to space-charge-limited current (SCLC) is no longer valid [4] . Using a generalized FN scaling of ln(J/F k ) □ 1/F, where J is the current density and F is the applied field, we study the effects of different k to the current density-voltage (J-V) transition characteristic. For a vacuum diode, if the value of k is smaller than k crit =1.5, we will have pure FE with absolute absence of SCLC or 3-stage FE-to-SCLC-to-FE, depending on the size of the diode D. We extend the model to a solid diode (collisional transport), and the corresponding critical value becomes k crit =2. The transition behavior is more complicated, which depends not only on D, but also the electron mobility μ in the solid. Our findings provide a theoretical foundation for modelling unconventional field emission injection in both ballistic and collisional regimes, which is significant for various applications [5] in vacuum electronics, beam physics, gas-based diode, plasma, and dielectric.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128881435","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

Power Calculations for Overmoded High Power Millimeter-Wave Devices 超模高功率毫米波器件的功率计算

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/icops45751.2022.9812957

A. Elfrgani, J. Vijayamohanan, J. Giese, A. Kuskov, N. Burt, E. Schamiloglu

引用次数: 0

LSP Modelling of the Merlin IVA Commissioning Performance Merlin IVA调试性能的LSP建模

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813259

A. Meadowcroft, M. Sinclair, A. Jones, K. Thomas, A. Hughes, C. Hines, D. Goude, J. Threadgold

引用次数: 0

Underwater Shock Wave Generated by Exploding Wire Ignited Energetic Materials: Wave Reconstruction and Physical Model Test 爆丝引燃含能材料产生的水下冲击波:波形重构与物理模型试验

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9812993

Y. Hu, Z. Tao, J. Hu, T. Li, H. Shi, J. Wu, X. Li, A. Qiu

{"title":"Underwater Shock Wave Generated by Exploding Wire Ignited Energetic Materials: Wave Reconstruction and Physical Model Test","authors":"Y. Hu, Z. Tao, J. Hu, T. Li, H. Shi, J. Wu, X. Li, A. Qiu","doi":"10.1109/ICOPS45751.2022.9812993","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9812993","url":null,"abstract":"Underwater shock wave (SW) generated by the combination of energetic material (EM) and electrical wire explosion (EWE) are attracting more and more attention in the field of reservoir stimulation. However, it is difficult to study the characteristics of hybrid SW that contains multiple SW components with different intensities and time delays. In order to optimize the formula of EM and the parameters of pulsed power supply, it is necessary to establish the relationship between exploding wire, formulation of EM and SW. In this work, we described hybrid SW waveforms with four simple functions based on the mechanism of ignition, which not only reflects the waveform characteristics, but also ensures the accuracy of the impulse and energy density of the reconstructed SW. The characteristic parameters were then extracted so as to adjust the ratio of oxidant and reducing agent to achieve the purpose of controlling the release rate of chemical energy. In addition, hybrid SWs were used in the physical model test of cracking concrete to study the fracturing effect, and complex fracture networks were created after operation. Combined with high-speed photography and the numerical results of Autodyn simulations, fracturing mechanism of the hybrid SW was analyzed to give suggestions for further formulation optimization.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134628230","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

Simulations of Thin-Foil Liner Implosions Driven by a Dynamic Screw Pinch 动态螺旋夹紧驱动薄箔衬垫内爆的模拟

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813231

S. Humane, J. Woolstrum, R. Mcbride

引用次数: 0

Low Power Demonstration of a QUASIOPTICAL Active Pulse Compressor for High Power Millimeter-Waves 高功率毫米波准光有源脉冲压缩器的低功率演示

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813042

S. Schaub, B. Hoff

引用次数: 0