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Improving the resistivity variation in multi-layer heaters for use in dispenser cathodes 改进分配器阴极用多层加热器的电阻率变化
IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference Pub Date : 2014-07-17 DOI: 10.1109/IVEC.2014.6857542
J. Spicer, D. Hayes, B. Antohe
{"title":"Improving the resistivity variation in multi-layer heaters for use in dispenser cathodes","authors":"J. Spicer, D. Hayes, B. Antohe","doi":"10.1109/IVEC.2014.6857542","DOIUrl":"https://doi.org/10.1109/IVEC.2014.6857542","url":null,"abstract":"Dispenser cathodes must operate at specific temperature while a specific heater power is applied. To achieve the required temperature, a coiled wire heater is commonly used. These heaters are typically manufactured from Tungsten-Rhenium wire which is wound into a non-inductive coil. As the heater geometry is constrained by the material properties and electrical isolation needs of the wire, the coiled wire heater is often an inefficient use of available space and results in increased cost for the cathode assembly. The technology for a printed heater exists, but, so far, has been unable to meet the production resistivity requirements. This paper presents initial research using ink- jetted tungsten particles on a ceramic substrate as an alternate approach to the heater design.","PeriodicalId":88890,"journal":{"name":"IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference","volume":"28 1","pages":"165-166"},"PeriodicalIF":0.0,"publicationDate":"2014-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77282550","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
Envelop tracking concept for space TWTs with higher efficiency 具有更高效率的空间行波管包络跟踪概念
IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference Pub Date : 2014-07-17 DOI: 10.1109/IVEC.2014.6857484
F. André
{"title":"Envelop tracking concept for space TWTs with higher efficiency","authors":"F. André","doi":"10.1109/IVEC.2014.6857484","DOIUrl":"https://doi.org/10.1109/IVEC.2014.6857484","url":null,"abstract":"The high efficiency requirements for space TWTs can be addressed by envelop tracking. In the new concept we describe here the beam current is commanded by the instantaneous envelop power of the modulated signal to be amplified. New technologies of cold cathodes could enable such current modulation in the future. Here we assess the benefits of envelop tracking concept for different kinds of modulation scheme.","PeriodicalId":88890,"journal":{"name":"IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference","volume":"11 1","pages":"49-50"},"PeriodicalIF":0.0,"publicationDate":"2014-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87876034","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
Tetrode based technology demonstrator at 352 MHz, 400 kWp for ESS spoke linac 基于四极管的技术演示器，352 MHz, 400 kWp，用于ESS轮辐直线加速器
IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference Pub Date : 2014-07-17 DOI: 10.1109/IVEC.2014.6857516
R. Yogi, R. Wedberg, L. Hermansson, Konrad Gajeski, E. Montesinos, V. Ziemann, T. Ekelof, R. Ruber
{"title":"Tetrode based technology demonstrator at 352 MHz, 400 kWp for ESS spoke linac","authors":"R. Yogi, R. Wedberg, L. Hermansson, Konrad Gajeski, E. Montesinos, V. Ziemann, T. Ekelof, R. Ruber","doi":"10.1109/IVEC.2014.6857516","DOIUrl":"https://doi.org/10.1109/IVEC.2014.6857516","url":null,"abstract":"The European Spallation Source (ESS) will be the world's most powerful spallation neutron source when it comes in operation at the end of this decade. The ESS linac will accelerate 50mA of protons to 2 GeV in 2.86 ms long pulses at a repetition rate of 14 Hz on a tungsten target for neutron spallation. The linac contains 26 superconducting spoke cavities, which are being developed by IPN Orsay, France, and which accelerate the protons from 90 to 220 MeV. The FREIA laboratory at Uppsala University (Sweden) has developed the required RF power sources, procured the RF distribution and will test the cavities at nominal power. As no suitable amplifier was available at the ESS specifications (352MHz, 400kWp / 20kWavg, pulse width = 3.5 ms, pulse repetition frequency = 14 Hz), various technologies were compared and tetrode technology was selected for the first technology demonstrator RF power station at FREIA. We discuss the design of the technology demonstrator and present the first test results.","PeriodicalId":88890,"journal":{"name":"IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference","volume":"1 1","pages":"113-115"},"PeriodicalIF":0.0,"publicationDate":"2014-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90819889","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
Backscattered electrons from X-ray target 来自x射线目标的反向散射电子
IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference Pub Date : 2014-05-25 DOI: 10.1109/PLASMA.2014.7012536
T. Bui, D. Hart, R. Ives
{"title":"Backscattered electrons from X-ray target","authors":"T. Bui, D. Hart, R. Ives","doi":"10.1109/PLASMA.2014.7012536","DOIUrl":"https://doi.org/10.1109/PLASMA.2014.7012536","url":null,"abstract":"X-rays are radiated from a target when an electron beam is accelerated and collides it. When high energy electrons struck a metal target, significant backscattered electrons could be generated and reduce the image sharpness. This paper will describe the Monte Carlo algorithm to analyze backscattered electrons in Beam Optics Analyzer (BOA) and present simulation results of an X-ray tube. The results will be compared with experimental data.","PeriodicalId":88890,"journal":{"name":"IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference","volume":"1 1","pages":"81-82"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82022401","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: 2
Modeling high average current and high bunch charge beams in MICHELLE-eBEAM MICHELLE-eBEAM中高平均电流和高束电荷光束的建模
IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference Pub Date : 2014-05-25 DOI: 10.1109/PLASMA.2014.7012533
S. Ovtchinnikov, J. Petillo, B. Koltenbah
{"title":"Modeling high average current and high bunch charge beams in MICHELLE-eBEAM","authors":"S. Ovtchinnikov, J. Petillo, B. Koltenbah","doi":"10.1109/PLASMA.2014.7012533","DOIUrl":"https://doi.org/10.1109/PLASMA.2014.7012533","url":null,"abstract":"The MICHELLE-eBEAM code has been employed successfully for modeling high average current and high bunch charge beams using a time-dependent model. Accurate particle tracking with self-consistent space charge and image forces is important in modeling detailed phase space evolution of high charge electron bunches. The MICHELLE-eBEAM code presents a promising solution where the model resolution only depends on the number of particles modeled and the detailed phase space evolution is enabled by accurate Coulomb calculations facilitated by a GPU-based tree algorithm. In this paper we report on our latest progress and show validation and benchmarking results.","PeriodicalId":88890,"journal":{"name":"IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference","volume":"1 1","pages":"141-142"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83067169","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
Hot matching conditions of coupled-cavity traveling-wave tubes 耦合腔行波管的热匹配条件
IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference Pub Date : 2014-04-22 DOI: 10.1109/IVEC.2014.6857467
S. Meyne, J. David, A. Jacob
{"title":"Hot matching conditions of coupled-cavity traveling-wave tubes","authors":"S. Meyne, J. David, A. Jacob","doi":"10.1109/IVEC.2014.6857467","DOIUrl":"https://doi.org/10.1109/IVEC.2014.6857467","url":null,"abstract":"An analysis of the propagation characteristics of coupled-cavity (CC) delay lines in traveling-wave tubes (TWTs) under hot conditions is proposed. Using this approach a necessary impedance level at the end of the periodic line is derived that leads to minimum input reflections during operation. From this matching condition a required cold input reflection can be predicted which is in general different from the one commonly used.","PeriodicalId":88890,"journal":{"name":"IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference","volume":"37 1","pages":"15-16"},"PeriodicalIF":0.0,"publicationDate":"2014-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75150082","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: 2
A new dual-mode two-gap strip-line resonator for microwave devices with field-emission cathode 一种用于场发射阴极微波器件的新型双模双间隙带线谐振器
IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference Pub Date : 2014-04-22 DOI: 10.1109/IVEC.2014.6857643
V. Tsarev, Y. Pchelnikov, A. Miroshnichenko, N. A. Akafyeva
{"title":"A new dual-mode two-gap strip-line resonator for microwave devices with field-emission cathode","authors":"V. Tsarev, Y. Pchelnikov, A. Miroshnichenko, N. A. Akafyeva","doi":"10.1109/IVEC.2014.6857643","DOIUrl":"https://doi.org/10.1109/IVEC.2014.6857643","url":null,"abstract":"A two-gap resonator on the basis of spiral symmetric strip line for klystron type microwave tubes with field emitter arrays (FEA) cathodes was investigated. Presented resonator has the suspended substrate strip-line (SSS) that allowed designing a compact dual-mode two-gap resonant system for a multi-beam klystron type microwave tubes with the cold cathode (FEA).","PeriodicalId":88890,"journal":{"name":"IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference","volume":"77 1","pages":"369-370"},"PeriodicalIF":0.0,"publicationDate":"2014-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73335557","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 and production of a 1.3 GHz, 300 kW CW klystron 1.3 GHz, 300 kW连续速调管的开发和生产
IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference Pub Date : 2014-04-22 DOI: 10.1109/IVEC.2014.6857642
T. Habermann, J. Atkinson, G. Aymar, R. Begum, E. Cesca, L. Cox, E. Eisen, B. Stockwell
{"title":"Development and production of a 1.3 GHz, 300 kW CW klystron","authors":"T. Habermann, J. Atkinson, G. Aymar, R. Begum, E. Cesca, L. Cox, E. Eisen, B. Stockwell","doi":"10.1109/IVEC.2014.6857642","DOIUrl":"https://doi.org/10.1109/IVEC.2014.6857642","url":null,"abstract":"Communications and Power Industries has designed and manufactured the VKL-7967A, a high-efficiency, high CW power L-band klystron. The klystron operates at 1.3 GHz and is designed to saturate above 300 kW CW RF output with ≥65% efficiency. The users intend to operate in the linear range of the transfer curve and therefore required 270 kW CW RF output with ≥0.5dB/dB incremental gain and ≥52% minimum efficiency. Two klystrons have been manufactured and successfully tested. Their performance data are compared with the simulations performed during the design.","PeriodicalId":88890,"journal":{"name":"IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference","volume":"97 1","pages":"367-368"},"PeriodicalIF":0.0,"publicationDate":"2014-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80529624","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 10 kW CW high efficiency S-band PPM klystron 一个10千瓦的连续波高效率s波段PPM速调管
IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference Pub Date : 2014-04-22 DOI: 10.1109/IVEC.2014.6857566
P. Ferguson, M. Read, D. Marsden, T. Bui, L. Ives
{"title":"A 10 kW CW high efficiency S-band PPM klystron","authors":"P. Ferguson, M. Read, D. Marsden, T. Bui, L. Ives","doi":"10.1109/IVEC.2014.6857566","DOIUrl":"https://doi.org/10.1109/IVEC.2014.6857566","url":null,"abstract":"Calabazas Creek Research, Inc. is developing a 10 kW CW, high efficiency, S-band, Periodic Permanent Magnet (PPM) focused klystron capable of driving accelerator cavities. The presentation will describe the design, computational analysis, and measured results. Measurements will be compared to simulation results from the large signal codes KLSC and Tesla.","PeriodicalId":88890,"journal":{"name":"IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference","volume":"67 1","pages":"213-214"},"PeriodicalIF":0.0,"publicationDate":"2014-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86034625","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 of an X-band high power CW klystron x波段大功率连续波速调管的设计
IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference Pub Date : 2014-04-22 DOI: 10.1109/IVEC.2014.6857638
Rui Zhang, Yong Wang
{"title":"Design of an X-band high power CW klystron","authors":"Rui Zhang, Yong Wang","doi":"10.1109/IVEC.2014.6857638","DOIUrl":"https://doi.org/10.1109/IVEC.2014.6857638","url":null,"abstract":"This paper describes the design of the RF circuit and gun for an X-band high power CW klystron. The RF circuit consists of six cavities. One-dimensional large signal simulation results indicate that the circuit has an efficiency of more than 50% with a saturated gain of 50dB. The gun has a perveance of 1.0μp. The beam focusing system is a solenoid magnet structure. Simulation indicates that the beam-to-tunnel radial fill factor less than 0.6, and the beam ripple less than 5%.","PeriodicalId":88890,"journal":{"name":"IEEE International Vacuum Electronics Conference. International Vacuum Electronics Conference","volume":"74 1","pages":"359-360"},"PeriodicalIF":0.0,"publicationDate":"2014-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79853405","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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