2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)最新文献_第8页

Particle-In-Cell Simulations of Beam-wave Interacion for Sub-Terahertz Folded Waveguide Traveling Wave Tubes 亚太赫兹折叠波导行波管波束相互作用的粒子胞内模拟

2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520497

Zhengyuan Zhao, Wenxin Liu, Longlong Yang, Yue Ou

引用次数: 0

A New type of 0.34THz Sine Waveguide Slow Wave Structure 一种新型0.34THz正弦波波导慢波结构

2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520517

Xueheng Zhang, Jin Xu, S. Fang, Xuebing Jiang, P.C. Yin, Jing-Wen Luo, Yijun Hu, Xiuling Ge, H. Yin, Lingna Yue, G. Zhao, W. Yang, W.X. Wang, Y. Gong, W.X. Liu, D.Z. Li, Y. Wei

引用次数: 2

NEC Network and Sensor Systems, Ltd. Q/V-band Helix TWT for Future High Throughput Satellite Uplink Applications NEC网络和传感器系统有限公司面向未来高通量卫星上行链路应用的Q/ v波段螺旋行波管

2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520582

Naofumi Kosugi, Daiki Matsumoto, T. Machida, T. Munehiro, Yoshinori Mori, Travis Stewart

引用次数: 1

Diamond p-i-n-nanoC Diodes for Electron Emitters 电子发射体用金刚石p-i-n-纳米c二极管

2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520600

F. Koeck, M. Benipal, H. Surdi, R. Nemanich

{"title":"Diamond p-i-n-nanoC Diodes for Electron Emitters","authors":"F. Koeck, M. Benipal, H. Surdi, R. Nemanich","doi":"10.1109/IVEC45766.2020.9520600","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520600","url":null,"abstract":"Electron emitters are widely deployed in traveling wavetubes (TWTs) for communications, radar applications, and scientific apparatus like free electron lasers. These instruments typically utilize cathodes that release an electron current through application of thermal energy or high electric fields. A novel electron emitter approach exploits the negative electron affinity surface of diamond in a modified semiconductor p-i-n diode. Under a forward bias electrons are injected into the conduction band of the diamond diode and a fraction are emitted into vacuum. Electron emission occurs at room temperature and low electric fields. We have prepared a modified diamond p-i-n diode that included a highly conducting nanostructured carbon (nanoC) contact layer utilizing plasma-enhanced chemical vapor deposition (PECVD) on a single crystal boron doped substrate. Emitter devices with various geometries were then fabricated using photo-lithography. After a hydrogen passivation step individual devices were characterized in vacuum. Under a forward bias the p-i-n-nanoC diodes displayed light emission indicative of bipolar transport. With a typical diode current of 0.1A an electron emission current approaching 0.4mA was measured from a single device sized 1.2mm x 0.2mm.","PeriodicalId":170853,"journal":{"name":"2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127678079","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

Secondary Electron Simulations of a Gyrotron Collector with Magnetic Sweeping and Voltage Depression 磁扫压回旋管集热器二次电子模拟

2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520545

S. Cauffman, M. Blank, P. Borchard, K. Felch

{"title":"Secondary Electron Simulations of a Gyrotron Collector with Magnetic Sweeping and Voltage Depression","authors":"S. Cauffman, M. Blank, P. Borchard, K. Felch","doi":"10.1109/IVEC45766.2020.9520545","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520545","url":null,"abstract":"Megawatt-class gyrotrons are designed to distribute the residual electron beam energy across a large collecting surface, to keep power densities low enough to be dissipated without threatening long-term vacuum integrity. Because the incident beam is very narrow, various techniques are used to lower the instantaneous and time-averaged power densities on the collector surface, while keeping the size of the collector within the limits of current fabrication capabilities. Gyrotron collector design typically focuses on optimizing the power deposition of the incident (“primary”) beam. It is often assumed that the effects of secondary electron emission from the collector surface (whether due to reflection of primaries, or true secondary emission) will tend to further spread the power density profile. Such additional spreading can be beneficial if it lowers peak power densities, but can be detrimental if it deposits power in undesired locations or sends particles back toward the gyrotron’s interaction region. Here, we simulate the effects of secondary/reflected electrons in the VGT-8115, a 110 GHz, 1.2 MW, 10-second gyrotron used for electron cyclotron heating and current drive in the DIII-D tokamak. We examine the ramifications of secondary emission under various operating conditions, such as variations in collector sweeping parameters and collector depression voltage, comparing power densities and particle trajectories with and without secondaries.","PeriodicalId":170853,"journal":{"name":"2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115466015","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: 1

First-Principles Model of Miram Curve from Polycrystalline Tungsten Cathodes 多晶钨阴极Miram曲线的第一性原理模型

2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520431

Dongzheng Chen, R. Jacobs, D. Morgan, J. Booske

引用次数: 0

Self-Consistent Modeling of Waveguide Circulator Under Realistic Magnetic Field for Industrial Applications 工业实际磁场下波导环行器的自洽建模

2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520639

Kaviya Aranganadin, H. Hsu, Ming-Chieh Lin

{"title":"Self-Consistent Modeling of Waveguide Circulator Under Realistic Magnetic Field for Industrial Applications","authors":"Kaviya Aranganadin, H. Hsu, Ming-Chieh Lin","doi":"10.1109/IVEC45766.2020.9520639","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520639","url":null,"abstract":"An RF waveguide circulator is a ferromagnetic passive device with three or four ports, which is used to protect other RF components from excessive signal reflection. The previous studies on the design and development of the circulators deal with achieving broad bandwidth and high transmission efficiency using finite element method (FEM) simulations with a homogenous applied bias field. This work takes a step further and presents a novel self-consistent approach to modeling a ferrite waveguide circulator by solving electromagnetic and magnetostatic equations simultaneously. The comparison between the homogenous and the non-homogenous field models shows the importance of coupling a magnetic circuit to an electromagnetic simulation. The more realistic circulator design presented here still has a broad bandwidth of 180 MHz, insertion loss less than 0.24 dB, reflection, and isolation better than 20 dB operated at the center frequency of 2.45 GHz. It can be used to replace an industrial waveguide circulator, which has only a 50 MHz bandwidth. Hence, by increasing the bandwidth of a circulator, one can reduce the number of units for a dual-frequency magnetrons operating concurrently at 2,430 and 2,480 MHz with a working power of 3 kW each employed in the microwave plasma system.","PeriodicalId":170853,"journal":{"name":"2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126243217","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

High power microwave measurement techniques at CEA-Gramat CEA-Gramat的高功率微波测量技术

2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520472

A. Chauloux, J. Diot, N. Tharaud, Jérémy Pothée

引用次数: 1

Research on the Competition Mode Suppression in Coaxial Extended Interaction Structure 同轴扩展相互作用结构中竞争模式抑制研究

2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520453

Zhang Xu, Zhang Rui, Wang Yong

引用次数: 0

Frequency Tuning and Spectrum Control in Sub-THz Gyrotrons 亚太赫兹回旋管的频率调谐与频谱控制

2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520549

M. Glyavin, G. Denisov, A. Fedotov, A. Fokin, I. Zotova, A. Bogdashov

引用次数: 0