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2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)最新文献

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High Power Pulsed 263 GHz Extended Interaction Amplifier 高功率脉冲263 GHz扩展相互作用放大器
2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520519
M. Hyttinen, A. Roitman, P. Horoyski, H. Deng
{"title":"High Power Pulsed 263 GHz Extended Interaction Amplifier","authors":"M. Hyttinen, A. Roitman, P. Horoyski, H. Deng","doi":"10.1109/IVEC45766.2020.9520519","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520519","url":null,"abstract":"This paper presents test results on a new model of pulsed EIK amplifier operating at 263 GHz targeting applications in advanced weather radar, DNP enhancement of NMR systems and visual imaging for homeland security. This EIK delivered an output power greater than 70 watts, gain of over 30dB and a -3dB bandwidth greater than 1000 MHz.","PeriodicalId":170853,"journal":{"name":"2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)","volume":"116 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":"133355597","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: 8
Modular High Power RF Sources for Compact Linear Accelerator Systems 用于紧凑型直线加速器系统的模块化高功率射频源
2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520446
B. Weatherford, M. Kemp, Xueying Lu, Julian Merrick, E. Nanni, J. Neilson, A. Sy, Sami G. Tantawi
{"title":"Modular High Power RF Sources for Compact Linear Accelerator Systems","authors":"B. Weatherford, M. Kemp, Xueying Lu, Julian Merrick, E. Nanni, J. Neilson, A. Sy, Sami G. Tantawi","doi":"10.1109/IVEC45766.2020.9520446","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520446","url":null,"abstract":"SLAC is pursuing high efficiency, low cost RF source designs that are suitable for mass production, in order to enable the next generation of linear accelerators. These efforts have driven the development of compact linac systems with integrated modulators, klystrons, and accelerator structures, based on a modular, low voltage klystron topology. There is substantial demand for compact linacs for X-ray radiography with security applications, and for new radiation therapy machines that reduce treatment times by orders of magnitude and may yield beneficial biological effects. In this presentation, details and challenges for these new compact accelerator systems and the corresponding RF sources are discussed.","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":"133655422","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: 5
A Three-stage Depressed Collector for 220 GHz Sheet Beam Traveling-wave Tubes 用于220 GHz片束行波管的三级抑制集热器
2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520474
Merdan Wulam, Shengkun Jiang, Yiliang Xu, H. Gong, Y. Gong, Z. Duan
{"title":"A Three-stage Depressed Collector for 220 GHz Sheet Beam Traveling-wave Tubes","authors":"Merdan Wulam, Shengkun Jiang, Yiliang Xu, H. Gong, Y. Gong, Z. Duan","doi":"10.1109/IVEC45766.2020.9520474","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520474","url":null,"abstract":"In this paper, a three-stage depressed collector suitable for 220 GHz sheet beam traveling-wave tube (TWT) is studied. The condition of spent sheet beam is analyzed by using the CST 2016 Particle Studio. The positions distribution and velocity of the sheet beam are also obtained. Based on the analysis of the sheet beam at the entrance of the collector and the characteristics of the sheet beam after the interaction of 220 GHz sheet beam TWT, an efficient and low back streaming current three-stage depressed collector with the rectangular inlet and elliptical cavity shape is proposed. The collector efficiency is about 90% and the back streaming current is only 1.6 mA, which is accounting for 1% of the sheet beam current. This paper can provide some basic guidance for designing multistage depressed collector for 220 GHz sheet beam TWT.","PeriodicalId":170853,"journal":{"name":"2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)","volume":"100 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":"132082962","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: 5
Investigation on a 170 GHz/230 GHz Dual Mode Megawatt-class Gyrotron For CFETR CFETR用170 GHz/230 GHz双模兆瓦级回旋管的研究
2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520570
Qiao Liu, X. Niu, Ying-hui Liu, Jianwei Liu, Lina Wang, Jie Qing
{"title":"Investigation on a 170 GHz/230 GHz Dual Mode Megawatt-class Gyrotron For CFETR","authors":"Qiao Liu, X. Niu, Ying-hui Liu, Jianwei Liu, Lina Wang, Jie Qing","doi":"10.1109/IVEC45766.2020.9520570","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520570","url":null,"abstract":"in this paper, we present an investigation on a dual-frequency dual-mode megawatt-class gyrotron. The gyrotron can operate at frequencies of 170 GHz and 240 GH with the corresponding operating modes TE33.12 and TE44.16, respectively. In the analyses, the startup scenarios for the operating modes have been investigated by an in-house, developed, multi-mode, time-dependent code. The simulations result show that the output power of the gyrotron can reach about 1 MW at two operating frequencies with corresponding operating conditions.","PeriodicalId":170853,"journal":{"name":"2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)","volume":"8 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114029181","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
Field Emission Cathodes Fabricated from Bulk Carbon Nanotube Fibers and Films 块状碳纳米管纤维和薄膜制备场发射阴极
2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520634
S. Fairchild, P. Murray, S. Portillo, G. Dion
{"title":"Field Emission Cathodes Fabricated from Bulk Carbon Nanotube Fibers and Films","authors":"S. Fairchild, P. Murray, S. Portillo, G. Dion","doi":"10.1109/IVEC45766.2020.9520634","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520634","url":null,"abstract":"Carbon Nanotube (CNT) fibers and films have demonstrated excellent field emission (FE) properties and thus hold significant potential for use as electron sources for vacuum electronic devices VEDs). FE cathodes made from 100μm diameter CNT fibers were fabricated on an industrial grade 3D knitting machine. A 1” diameter cathode was tested using 30kV, 30A power supply with a 300ns pulse width. An applied field strength of 3V/μm produced a measured current level of approximately 15A. A CNT film cathode was fabricated from a 20mm wide film arranged in a corrugated geometry. This cathode was tested in a low impedance linear transformer driver (LTD) system operating at 30kV with a 200ns pulse width. The measured current level was approximately 2kA for an applied field strength of 6V/μm.","PeriodicalId":170853,"journal":{"name":"2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)","volume":"132 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":"116036877","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
A Thermal Analysis Method for Dielectric Supported Ring-bar Meander Line Slow Wave Structure 介质支撑环棒弯曲线慢波结构的热分析方法
2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520611
Yang Dong, Hexin Wang, Zijun Chen, Zhanliang Wang, Zhigang Lu, H. Gong, Z. Duan, Y. Gong, Shaomeng Wang
{"title":"A Thermal Analysis Method for Dielectric Supported Ring-bar Meander Line Slow Wave Structure","authors":"Yang Dong, Hexin Wang, Zijun Chen, Zhanliang Wang, Zhigang Lu, H. Gong, Z. Duan, Y. Gong, Shaomeng Wang","doi":"10.1109/IVEC45766.2020.9520611","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520611","url":null,"abstract":"The thermal characteristics are important for the proper operation of the high-power traveling wave tube (TWT). And they are affected by internal thermal losses, which mainly come from high-frequency loss and electron interception loss. The high-frequency loss can be calculated by setting the material of the slow wave structure (SWS) as PEC and lossy, respectively, and combining the power flow curve. Taking the thermal loss as heat source and processing the SWS in sections, the temperature distribution of the SWS can be obtained by thermal simulation, in which the thermal contact conductance has a greater influence on the maximum temperature.","PeriodicalId":170853,"journal":{"name":"2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)","volume":"9 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":"134099130","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
The Verification of the Expression of the Interaction Impedance and Ohmic Losses of the Nonuniform-grating-based Slow Wave Structure 基于非均匀光栅的慢波结构相互作用阻抗和欧姆损耗表达式的验证
2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520595
Fengzhen Zhang, Zhaochuan Zhang, Dongping Gao, Xiaoyan Wang
{"title":"The Verification of the Expression of the Interaction Impedance and Ohmic Losses of the Nonuniform-grating-based Slow Wave Structure","authors":"Fengzhen Zhang, Zhaochuan Zhang, Dongping Gao, Xiaoyan Wang","doi":"10.1109/IVEC45766.2020.9520595","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520595","url":null,"abstract":"The expression of the interaction impedance of the nonuniform-grating-based slow wave structure (SWS) is given in this paper. The verification of the expression of the interaction impedance and Ohmic losses of the non-dielectric-loaded (NDL) SWS and partially dielectric-loaded (PDL) SWS is verified by simulations.","PeriodicalId":170853,"journal":{"name":"2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)","volume":"13 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":"133675092","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
Temperature Effects on Desorption Behavior and Characteristic Wulff Shapes of Scandate Cathodes 温度对阴极解吸行为和特征Wulff形状的影响
2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520596
Mujan N. Seif, T. Balk, M. Beck
{"title":"Temperature Effects on Desorption Behavior and Characteristic Wulff Shapes of Scandate Cathodes","authors":"Mujan N. Seif, T. Balk, M. Beck","doi":"10.1109/IVEC45766.2020.9520596","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520596","url":null,"abstract":"Scandate cathodes have been shown to exhibit superior emission properties to other classes of thermionic cathodes. However, a deeper understanding of their fundamental operating behavior is crucial before widespread technological integration. It is a widely held hypothesis that the electron emission of scandate cathodes is related to Ba availability on the surfaces of the porous W matrix. In addition, extensive characterization of scandate cathodes motivates an additional hypothesis that high-performance cathodes all contain W nanoparticles of a particular shape. These attributes, Ba availability and nanoparticle shape, are significantly affected by temperature-the former due to desorption and the latter to the temperature-dependence of surface excess free energies. Here, we report computed Ba desorption rates for surfaces at $850^{circ}C$ (operating temperature). We show that total Ba evaporation from the Ba/O-decorated W(110) surface $issim 13$ orders of magnitude higher than the Ba/O-decorated W(112). We also report that temperatures on the order of $850^{circ}C$ imply that chemical environments suffcient to reduce BaO are required to form the W particle shapes observed in high-performing Sc cathodes.","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":"122348010","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
A 1.3 GHz 100 kW Ultra-high Efficiency Klystron 1.3 GHz 100kw超高效率速调管
2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520607
M. Read, R. Ives, T. Habermann, T. Bui, D. Marsden, G. Collins, A. Jensen
{"title":"A 1.3 GHz 100 kW Ultra-high Efficiency Klystron","authors":"M. Read, R. Ives, T. Habermann, T. Bui, D. Marsden, G. Collins, A. Jensen","doi":"10.1109/IVEC45766.2020.9520607","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520607","url":null,"abstract":"Calabazas Creek Research, Inc. is developing a high efficiency, 1.3 GHz, 100 kW klystron for driving accelerators. A design with an efficiency of 79% has been realized and a device is being fabricated. Details of the design and available test results will be presented.","PeriodicalId":170853,"journal":{"name":"2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)","volume":"6 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":"122391411","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
Design and Simulation of a Relativistic S-Band Inverted Magnetron 相对论s波段反向磁控管的设计与仿真
2020 IEEE 21st International Conference on Vacuum Electronics (IVEC) Pub Date : 2020-10-19 DOI: 10.1109/IVEC45766.2020.9520558
T. Fleming, P. Mardahl
{"title":"Design and Simulation of a Relativistic S-Band Inverted Magnetron","authors":"T. Fleming, P. Mardahl","doi":"10.1109/IVEC45766.2020.9520558","DOIUrl":"https://doi.org/10.1109/IVEC45766.2020.9520558","url":null,"abstract":"A Giga-Watt class Inverted relativistic Magnetron Oscillator (IMO) was designed and simulated using the massively parallel electromagnetic particle-in-cell code ICEPIC and scaling/redesign of an existing L-Band IMO. The IMO presented here is designed to operate in S-Band at low magnetic fields $(mathrm{B}sim 0.13mathrm{T})$. An axial RF power extraction method is employed. This technique eliminates the need for waveguide combiners, mode conversion apparatus, and complex radiating structures. ICEPIC simulations confirm that the above features combined with the IMO’s stable, robust and reliable performance in the desired mode yield a Giga-Watt class HPM source notable for its size and absence of downstream current loss.","PeriodicalId":170853,"journal":{"name":"2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)","volume":"16 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":"125662108","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
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