2020 IEEE International Conference on Plasma Science (ICOPS)最新文献_第5页

Simulation of an Industrial Magnetron Using Cathode Modulation 工业磁控管阴极调制模拟

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/icops37625.2020.9717881

Andong Yue, J. Browning, M. Worthington, J. Cipolla

{"title":"Simulation of an Industrial Magnetron Using Cathode Modulation","authors":"Andong Yue, J. Browning, M. Worthington, J. Cipolla","doi":"10.1109/icops37625.2020.9717881","DOIUrl":"https://doi.org/10.1109/icops37625.2020.9717881","url":null,"abstract":"Results of a simulation study of the L3 Electron Devices Inc. CWM75KW industrial strapped magnetron will be presented. This study is part of a larger project which studies the feasibility of the achieving phase control and faster startup in the magnetron via controlled electron injection by using gated field emission arrays (GFEAs). The device was simulated by using the 3-D PIC code VSim at its typical operating conditions (18kV, 5A, 1900G, 896-929MHz). The simulated geometry of the device is a one-to-one reconstruction of the physical device based on drawings provided by L3 Electron Devices Inc. The startup behavior was examined with 1) no priming of any kind, 2) RF Priming, and 3) cathode modulation. With no priming or modulation of any kind, the simulated device failed to oscillate in a simulation time of 300 ns; this result was expected since the actual device startup may take milliseconds. For the RF priming study, a $pi$-mode RF field at the magnetron's operating power (75kW) was defined in the magnetron's interaction space; this driving field was then shut off after 50 ns. Upon removal of the RF driving field, the RF field strength in the interaction space begins to decay; however, after another 100 ns (150 ns from the beginning of the simulation), the RF field strength begins to regrow, and the device starts to oscillate. With cathode modulation, electrons are injected in-phase to form electron spokes; the simulated device was able to reach full oscillation within 130ns of startup by continuous modulated electron injection. Analysis of the cavity voltage, after full oscillation was reached, indicates an oscillation frequency of 898.07-914.49 MHz.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132656596","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

Development of a Vlasov Equation Based Numerical Model of Multipactor Discharge 基于Vlasov方程的多因素放电数值模型的建立

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717616

L. Silvestre, R. Joshi, J. Stephens, J. Dickens, J. Mankowski, A. Neuber

引用次数: 0

Deposition of Composite Magneto-Dielectric Coatings Using Fore-Vacuum Plasma-Cathode Electron Source 利用前真空等离子体阴极电子源沉积复合磁介质涂层

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/icops37625.2020.9717926

D. Zolotukhin, E. Oks, A. Tyunkov, Y. Yushkov, M. Keidar

引用次数: 0

High Frequency Fpga Based Data Control System Working Under Electromagnetically Disturbed Environment 电磁干扰环境下基于Fpga的高频数据控制系统

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717896

Roman Leduc, R. Ruscassié, J. Larbaig, T. Reess, L. Courtois

引用次数: 0

Simulation of the Growth of Carbon Nanotubes in Flowing Plasmas Using Particle-in-Cell Method 用细胞内粒子法模拟流动等离子体中碳纳米管生长

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717765

S. Averkin

引用次数: 0

3D MHD Simulations Of Wire Array Radiation Ablation Experiments And Magnetised Liner Fusion 线阵辐射烧蚀实验及磁衬里熔接的三维MHD模拟

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717684

J. Chittenden, A. Boxall, A. Crilly

引用次数: 0

OHM'S Law in the Slow Lane: Galilean Invariant Electromagnetic Closures for Electronion Plasmas 慢车道上的欧姆定律:电子等离子体的伽利略不变电磁闭包

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717491

K. Beckwith, J. Luginsland

引用次数: 0

2D Fluid Simulations of the Interaction Between Streamers and Dielectrics: Characteristics of Surface Charge 拖缆与介质相互作用的二维流体模拟:表面电荷的特性

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717663

Xiaoran Li, A. Sun, J. Teunissen

{"title":"2D Fluid Simulations of the Interaction Between Streamers and Dielectrics: Characteristics of Surface Charge","authors":"Xiaoran Li, A. Sun, J. Teunissen","doi":"10.1109/ICOPS37625.2020.9717663","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717663","url":null,"abstract":"Charges accumulating on the surface of insulators under dc voltage are regarded as potential hazards for HVDC apparatus. Here, we investigate the surface charge characteristics due to streamers interacting with dielectrics, including inception beside the dielectric, attaching to and propagation over the dielectric surface. The numerical model is based on the Afivo-streamer code1, and extended to include dielectrics2. Surface charge is calculated by summing up the electron and ion fluxes at the interface. For positive surface discharges, positive charge accumulates on the dielectric around streamer heads. But the amount of charge is quite small, even with secondary electron emission (caused by ions and photons) with a coefficient of up to 0.5. On the other hand, when the positive surface streamer is long enough, the electric field behind the head returns to a lower level, electrons diffuse back to the dielectric, thus, the surface charge becomes negative. For negative discharges, electrons attach to the dielectric surfaces, surface charge is negative, and the amount of charge can be dozens of times higher than for positive surface discharges. The maximum negative surface charge is present near the streamer head.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114481098","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

Characterization of the Imploding Plasma Sheath in Triple Nozzle Gas-Puff Z-Pinches at 1 MA 1毫安时三喷嘴吹气z -夹紧中内爆等离子体护套的特性

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717914

E. Lavine, S. Rocco, J. Angel, E. Freeman, W. Potter, J. Greenly, D. Hammer, B. Kusse

{"title":"Characterization of the Imploding Plasma Sheath in Triple Nozzle Gas-Puff Z-Pinches at 1 MA","authors":"E. Lavine, S. Rocco, J. Angel, E. Freeman, W. Potter, J. Greenly, D. Hammer, B. Kusse","doi":"10.1109/ICOPS37625.2020.9717914","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717914","url":null,"abstract":"Triple nozzle gas-puff implosions on the 1 MA, 220 ns COBRA generator at Cornell University provide an efficient source of intense x-ray radiation and are of interest for magneto-inertial fusion studies with an applied magnetic field. These implosions are susceptible to the magneto-Rayleigh-Taylor instability (MRTI); however, observations indicate that they are more stable than predicted by simple MRTI theory. Furthermore, the instability growth rate, characterized by an effective Atwood number, is observed to depend on gas species and initial fill density. Detailed measurements of the plasma parameters in the imploding plasma sheath can help to provide an explanation for these observations and can be used to validate simulation codes. To this end, we have used collective Thompson scattering, Zeeman polarization spectroscopy, and laser shearing interferometry to characterize the imploding plasma sheath at a radius of 1-1.5 cm for neon, argon, and krypton implosions with comparable linear mass densities. The preliminary results of this study are presented here.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117298518","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

Blue Milo Axial Diode Gap Optimization Using the Pulsed-Power Circuit Code Screamer 利用脉冲功率电路编码尖叫器优化蓝毫微米轴向二极管间隙

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717354

R. Shapovalov, N. Jordan, B. Sporer, R. Mcbride

引用次数: 0