2022 IEEE International Conference on Plasma Science (ICOPS)最新文献_第9页

Faraday Cup Measurements of Multiple Nanosecond Pulsed High-Current Electron Beam Generation from MICDS 多重纳秒脉冲大电流电子束产生的法拉第杯测量

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813283

K. N. Islam, D. Andreev, A. Glick, C. Rodriguez, J. Rose, A. Andreev, E. Schamiloglu

{"title":"Faraday Cup Measurements of Multiple Nanosecond Pulsed High-Current Electron Beam Generation from MICDS","authors":"K. N. Islam, D. Andreev, A. Glick, C. Rodriguez, J. Rose, A. Andreev, E. Schamiloglu","doi":"10.1109/ICOPS45751.2022.9813283","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813283","url":null,"abstract":"This study aims to validate analytical and PIC simulation results of generating multiple electron beams from nested magnetically insulated coaxial diodes (MICDs) at a single potential powered by a single power supply and transported in a smooth cylindrical drift tube. Previous analytical and simulation results of generating multiple electron beams are in good agreement [1] , [2] . The authors are in the process of measuring the electron beam current generated from the two thin annular beams using a Faraday cup (FC), a well-known technique to measure current from a pulsed relativistic electron beam accelerator. The SINUS-6 accelerator produces 15 ns electron beams with maximum current 4 kA at a maximum applied voltage of about 700 kV. The goal here is to produce two electron beams with comparable currents and 10-20% energy difference for a TWT [3] . We present preliminary measurements of electron beam current and current density as a function of radius with an estimate of electron beam energy from these measurements. The 45 mm diameter FC diagnostic is set up at the end of the drift tube output window where the FC probe comprises a semi-rigid coaxial cable with a center conductor connected to a graphite collector (cup). Our most recent measurements will be presented.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"06 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":"127275027","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 Twt Design by Using Adjoint Approach 用伴随法优化行波管设计

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813301

A. Vlasov, T. Antonsen, D. Chernin, I. Chernyavskiy

{"title":"Optimization of Twt Design by Using Adjoint Approach","authors":"A. Vlasov, T. Antonsen, D. Chernin, I. Chernyavskiy","doi":"10.1109/ICOPS45751.2022.9813301","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813301","url":null,"abstract":"We show that optimization of Traveling Wave Tube (TWT) design with respect to many design parameters can be efficiently performed by gradient based methods. The partial derivatives with respect to design parameters of various TWT figures of merit can be efficiently calculated by using the adjoint approach [1] , [2] . Several practically important figures of merit have been studied, include average gain, gain flatness, and gain-bandwidth product, and design parameters include beam voltage and circuit geometry. The derivatives are calculated by modified 1D large signal simulation code CHRISTINE-Z [3] and used in the steepest descent optimization algorithm that finds parameter values that minimize or maximize the desired figure of merit. Only three runs of the modified code are needed to compute the partial derivatives of the output power and phase at a specified frequency with respect to an arbitrary number of parameters. It results in a potentially large savings in computing time compared with direct, finite difference calculation of the partial derivatives. illustrate the method by optimizing the beam voltage and gap spacing of a W-band folded-waveguide TWT. The examples of TWT design optimization for small signal gain and output power in large signal regime will be presented and discussed.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"35 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":"121162662","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

Impedance Effects On Nonlinear Transmission Line Performance 阻抗对非线性传输线性能的影响

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/icops45751.2022.9813058

T. Crawford, X. Zhu, A. Garner

引用次数: 0

Evolutionary History of Atoms and Molecules in Reactive Laser-Produced Plasmas 反应性激光等离子体中原子和分子的进化史

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813306

E. Kautz, M. Phillips, A. Zelenyuk, S. S. Harilal

引用次数: 0

Instabilities in E × B Discharges Relevant to Electric Propulsion Plasmas 与电推进等离子体有关的E × B放电的不稳定性

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813113

Aayushman Sharma, C. Promislow, J. Little

引用次数: 0

Simulation of 2D Model of a Novel Microplasma Used for Printed Flexible Hybrid Electronics 用于印刷柔性混合电子器件的新型微等离子体二维模型仿真

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813260

A. Dhamala, N. Kandadai

引用次数: 0

Ambijet Treatment for Periimplantitis Ambijet治疗种植周炎

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813022

M. Bergmann, L. Ledernez, M. Altenburger, A. Kaufmann, T. Gros, F. Engesser, E. Buerkin

{"title":"Ambijet Treatment for Periimplantitis","authors":"M. Bergmann, L. Ledernez, M. Altenburger, A. Kaufmann, T. Gros, F. Engesser, E. Buerkin","doi":"10.1109/ICOPS45751.2022.9813022","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813022","url":null,"abstract":"Cold plasma techniques previously have been shown to be effective in eliminating pathogenic bacteria and biofilm. In this work we focus on the application of a custom-made plasma jet for the in-situ disinfection of dental implants to treat periimplantitis. In order to assess the surface finish in relation to cell behavior, dental implant material was prepared as titanium discs The discs were infected with bacteria in a bioreactor and plasma-treated. Human gingival fibroblasts were seeded, cultivated and stained by conventional immunofluorescence. Differences in cell adhesion and morphology could be observed after only one day of incubation. In particular, plasma-treated discs appeared to have an advanced effect on early cell response and proliferation when compared to conventional dental implant material. Furthermore the disinfection efficancy was testet with natural biofilm with convincing results. The application of a plasma jet can not only successfully remove highly pathogenic bacteria, but also improve implant surface activation as well as accelerate cell adhesion and proliferation. Therefore, it can be considered an innovative means of treating periimplantitis. The device is developed according to medical standards and meets the stipulated requirements. With changeable applicators the device can be customized to different applications.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"89 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":"125912728","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

Determination Of Bitumen Concentration by Analyzing Laser-Induced Breakdown Spectra (LIBS) Using Partial Least Squared Regression (PLSR) Method 用偏最小二乘回归(PLSR)分析激光诱导击穿光谱(LIBS)测定沥青浓度

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9812995

S. Mohajan, F. Mehravaran, Y. Huang, F. Keserwan, L. Droog, N. F. Beier, A. Bais, R. Fedosejevs, M. G. El-Din, A. Hussein

{"title":"Determination Of Bitumen Concentration by Analyzing Laser-Induced Breakdown Spectra (LIBS) Using Partial Least Squared Regression (PLSR) Method","authors":"S. Mohajan, F. Mehravaran, Y. Huang, F. Keserwan, L. Droog, N. F. Beier, A. Bais, R. Fedosejevs, M. G. El-Din, A. Hussein","doi":"10.1109/ICOPS45751.2022.9812995","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9812995","url":null,"abstract":"The determination of bitumen content in oil sands is essential for the characterization of tailings and enhancement of oil extraction efficiency. However, traditional bitumen content measurement methods, such as Dean-Stark Extraction, necessitate extensive lab-based sample preparation, increasing processing time. In-field bitumen content evaluation would substantially assist decision-making in order to run more effective mining and recovery operations. Here, we demonstrate the rapid determination of bitumen concentration using laser-induced breakdown spectra (LIBS) and four different normalization approaches in partial least squares regression (PLSR) analysis of wet and dry tailing sands consisting of 0.5-12% bitumen. The results reveal that wet bitumen samples require fewer PLSR components to explain 90% of the variance in LIBS spectra than dry bitumen samples, demonstrating the suitability of LIBS for analyzing samples with little preparation. A good correlation (R2 > 0.96) between LIBS spectra and bitumen content for both wet and dry samples was obtained, however the prediction standard deviation (SD < 4%) was improved for wet samples. The chemical composition of bitumen was also determined by computing the percentage abundance of each atomic element from the PLSR coefficient of the LIBS spectra.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"181 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":"126013463","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

Assessing Magnetic Insulation in a Crossed-Field Gap 评估交叉磁场间隙中的磁绝缘

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813180

A. Komrska, L. Breen, H. Yu, A. Darr, A. Loveless, K. Cartwright, A. Garner

引用次数: 0

Dependence of Space-Charge-Limited Current Density on Electrode Thickness for A Planar Diode 平面二极管空间电荷限制电流密度与电极厚度的关系

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813319

N. R. Sree Harsha, M. Pearlman, J. Browning, A. Garner

引用次数: 0