Pub Date : 2015-08-27DOI: 10.1109/IVEC.2015.7223982
Bo Chen, Yanjun Cui, Qiru Lu, Jing Feng, Jinjun Feng
This paper describes the development of a Ka-band Helix Travelling Wave Tube (TWT) for Millimeter wave Power Modules (MMPM). Measurements show that the TWT is capable to deliver output power of more than 100W with a high overall efficiency of 50% over 2 GHz bandwidth in Ka-band under the condition of equal input power. The TWT also has a compact package size of 280mm(L)×60mm(W)×40mm(H) with a light weight of 0.8kg.
{"title":"Development of a Ka-band Helix Travelling Wave Tube for Millimeter wave Power Modules","authors":"Bo Chen, Yanjun Cui, Qiru Lu, Jing Feng, Jinjun Feng","doi":"10.1109/IVEC.2015.7223982","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223982","url":null,"abstract":"This paper describes the development of a Ka-band Helix Travelling Wave Tube (TWT) for Millimeter wave Power Modules (MMPM). Measurements show that the TWT is capable to deliver output power of more than 100W with a high overall efficiency of 50% over 2 GHz bandwidth in Ka-band under the condition of equal input power. The TWT also has a compact package size of 280mm(L)×60mm(W)×40mm(H) with a light weight of 0.8kg.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115744246","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}
Pub Date : 2015-04-27DOI: 10.1109/IVEC.2015.7223782
Yury D. Mozgovoi, S. A. Khritkin
Using methods of computing modeling, resonant processes of merger of groups of electrons and positrons into macroplasmoid with the compensated Coulomb field and identical wave fields of electrons and positrons are considered. The macroscopic quantum processes in the toroidal storage leading to receiving the superfluid medium currents proportional to a gradient of a phase and the ring toroidal currents proportional to vector potential, and being superconductivity currents are discussed.
{"title":"Modeling of macroscopic quantum resonance processes in electron and positron flows","authors":"Yury D. Mozgovoi, S. A. Khritkin","doi":"10.1109/IVEC.2015.7223782","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223782","url":null,"abstract":"Using methods of computing modeling, resonant processes of merger of groups of electrons and positrons into macroplasmoid with the compensated Coulomb field and identical wave fields of electrons and positrons are considered. The macroscopic quantum processes in the toroidal storage leading to receiving the superfluid medium currents proportional to a gradient of a phase and the ring toroidal currents proportional to vector potential, and being superconductivity currents are discussed.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116647024","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}
Pub Date : 2015-04-27DOI: 10.1109/IVEC.2015.7223962
Shengen Li, T. Yan, Jinsheng Yang, Fengling Li, M. Ding
Cold cathode technology is significant development of magnetron. This magnetron has good stability and reliability, and could start up fast. Comparing the cold starting-up performance of four kind cold magnetrons, an alloy cathode is selected as the emitter of cold cathode magnetron finally. This alloy cathode magnetron could start up without filament and the starting-up time is less than 5s. At the same time, pulse width and output power of this magnetron is in accordance with conventional thermionic cathode magnetron.
{"title":"Ka-band magnetron with cold secondary-emission cathode","authors":"Shengen Li, T. Yan, Jinsheng Yang, Fengling Li, M. Ding","doi":"10.1109/IVEC.2015.7223962","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223962","url":null,"abstract":"Cold cathode technology is significant development of magnetron. This magnetron has good stability and reliability, and could start up fast. Comparing the cold starting-up performance of four kind cold magnetrons, an alloy cathode is selected as the emitter of cold cathode magnetron finally. This alloy cathode magnetron could start up without filament and the starting-up time is less than 5s. At the same time, pulse width and output power of this magnetron is in accordance with conventional thermionic cathode magnetron.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121049468","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}
Pub Date : 2015-04-27DOI: 10.1109/IVEC.2015.7223872
Zeng Peng, W. Jianguo, Wang Guangqiang, Li Shuang
Emittance effects become more prominent as the decrease of electron beam radius in millimeter wave (MMW) tube. In this paper, emittance effects on linear beams for an MMW tube with thermionic cathode were performed by utilizing a model derived from emittance effects on Brillouin flow. The results showed that emittance should be treated as dominative quantities for practical design of 150GHz or higher frequency linear-beams with thermionic cathode, when the voltage and current of these beams are 20kV and 100mA, respectively.
{"title":"Emittance effects on linear beams for millimeter-wave tubes with thermionic cathode","authors":"Zeng Peng, W. Jianguo, Wang Guangqiang, Li Shuang","doi":"10.1109/IVEC.2015.7223872","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223872","url":null,"abstract":"Emittance effects become more prominent as the decrease of electron beam radius in millimeter wave (MMW) tube. In this paper, emittance effects on linear beams for an MMW tube with thermionic cathode were performed by utilizing a model derived from emittance effects on Brillouin flow. The results showed that emittance should be treated as dominative quantities for practical design of 150GHz or higher frequency linear-beams with thermionic cathode, when the voltage and current of these beams are 20kV and 100mA, respectively.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123241337","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}
Pub Date : 2015-04-27DOI: 10.1109/IVEC.2015.7223842
M. Cao, Wenxin Liu, Yong Wang, Ke Li
A novel type of slow-wave structure for Smith-Purcell device called dielectric loaded metal grating, is proposed in this article. The three-dimensional (3D) analytical theory for the “hot” dispersion relation is derived using the field matched method and the results accord well with the simulation data performed by using 3D particle-in-cell (PIC) code.
{"title":"Dispersion characteristics of dielectric loaded grating for Smith-Purcell radiation in three dimensions","authors":"M. Cao, Wenxin Liu, Yong Wang, Ke Li","doi":"10.1109/IVEC.2015.7223842","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223842","url":null,"abstract":"A novel type of slow-wave structure for Smith-Purcell device called dielectric loaded metal grating, is proposed in this article. The three-dimensional (3D) analytical theory for the “hot” dispersion relation is derived using the field matched method and the results accord well with the simulation data performed by using 3D particle-in-cell (PIC) code.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125546725","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}
Pub Date : 2015-04-27DOI: 10.1109/IVEC.2015.7223779
S. Illy, Jianghua Zhang, J. Jelonnek
The KIT two-dimensional beam optics code ESRAY is an efficient tool for the design and optimization of magnetron injection guns and collectors of gyrotrons or comparable vacuum tubes. The applied numerical methods and latest modifications and enhancements will be presented. To achieve more realistic results, a new emitter surface roughness model and the treatment of secondary electrons has been implemented recently. An extension to three dimensions (without taking space-charge effects into account) permits the simulation of various collector sweeping concepts, including the very efficient transverse sweeping.
{"title":"Gyrotron electron gun and collector simulation with the ESRAY beam optics code","authors":"S. Illy, Jianghua Zhang, J. Jelonnek","doi":"10.1109/IVEC.2015.7223779","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223779","url":null,"abstract":"The KIT two-dimensional beam optics code ESRAY is an efficient tool for the design and optimization of magnetron injection guns and collectors of gyrotrons or comparable vacuum tubes. The applied numerical methods and latest modifications and enhancements will be presented. To achieve more realistic results, a new emitter surface roughness model and the treatment of secondary electrons has been implemented recently. An extension to three dimensions (without taking space-charge effects into account) permits the simulation of various collector sweeping concepts, including the very efficient transverse sweeping.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125671529","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}
Pub Date : 2015-04-27DOI: 10.1109/IVEC.2015.7223953
Weizhong Yan, Yu-Lu Hu, Jianqing Li, W. Peng, Xiaofang Zhu, Bin Li
We describe two large signal models of coupled-cavity traveling-wave tubes (CCTWTs) and folded-waveguide traveling-wave tubes (FWTWTs). These models include a generic theory derived from the Poynting's theorem and an equivalent circuit that uses a three-port network representation of the unit cell of the slow wave structures. Both of the models use the digital RF fields obtained from a 3-D finite element code, HFSS. The corresponding codes are applied to simulate the beam-wave interactions in a CCTWT and a FWTWT.
{"title":"Recent developments on generalized large signal models for TWTs","authors":"Weizhong Yan, Yu-Lu Hu, Jianqing Li, W. Peng, Xiaofang Zhu, Bin Li","doi":"10.1109/IVEC.2015.7223953","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223953","url":null,"abstract":"We describe two large signal models of coupled-cavity traveling-wave tubes (CCTWTs) and folded-waveguide traveling-wave tubes (FWTWTs). These models include a generic theory derived from the Poynting's theorem and an equivalent circuit that uses a three-port network representation of the unit cell of the slow wave structures. Both of the models use the digital RF fields obtained from a 3-D finite element code, HFSS. The corresponding codes are applied to simulate the beam-wave interactions in a CCTWT and a FWTWT.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125680414","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}
Pub Date : 2015-04-27DOI: 10.1109/IVEC.2015.7223738
A. Jensen, M. Fazio, A. Haase, E. Jongewaard, M. Kemp, J. Neilson
The 5045 klystron has been in production and accelerating particles at SLAC National Accelerator Laboratory for over 25 years [1]. Although the design has undergone some changes there are still significant opportunities for improvement in performance. Retrofitting the 5045 for higher efficiencies and a more mono-energetic spent beam profile is presented.
{"title":"Retrofitting the 5045 klystron for higher efficiency","authors":"A. Jensen, M. Fazio, A. Haase, E. Jongewaard, M. Kemp, J. Neilson","doi":"10.1109/IVEC.2015.7223738","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223738","url":null,"abstract":"The 5045 klystron has been in production and accelerating particles at SLAC National Accelerator Laboratory for over 25 years [1]. Although the design has undergone some changes there are still significant opportunities for improvement in performance. Retrofitting the 5045 for higher efficiencies and a more mono-energetic spent beam profile is presented.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115260131","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}
Pub Date : 2015-04-27DOI: 10.1109/IVEC.2015.7223893
Yong Tang, Yong Luo, Yong Xu
The paper introduce a particle simulation of a Q-band gyro-TWT operating in the circular waveguide TE01 mode at the fundamental cyclotron harmonic. The simulation predict that it can produce an output peak power over 265 kW at 46.5GHz, corresponding to a 37.8% efficiency, 47.2 dB gain, the 3dB bandwidth is about 3.5GHz. The potential backward wave oscillations (BWOs) TE11 TE21 and TE02 spurious modes are effectively suppressed by the distributed lossy loaded waveguide.
{"title":"Particle simulation of a Q-Band gyro-TWT with distributed lossy loaded circular waveguide circuit","authors":"Yong Tang, Yong Luo, Yong Xu","doi":"10.1109/IVEC.2015.7223893","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223893","url":null,"abstract":"The paper introduce a particle simulation of a Q-band gyro-TWT operating in the circular waveguide TE01 mode at the fundamental cyclotron harmonic. The simulation predict that it can produce an output peak power over 265 kW at 46.5GHz, corresponding to a 37.8% efficiency, 47.2 dB gain, the 3dB bandwidth is about 3.5GHz. The potential backward wave oscillations (BWOs) TE11 TE21 and TE02 spurious modes are effectively suppressed by the distributed lossy loaded waveguide.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115492552","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}
Pub Date : 2015-04-27DOI: 10.1109/IVEC.2015.7224031
Yanqing Liu, M. Ding, J. Su, Jianmin She, W. Tang
The excellent properties of diamond films make it extremely attractive to apply the material in microwave vacuum devices, in particular in high-power conditions. However, low dielectric loss and small thickness (usual less than 0.5mm) of the material make it difficult to measure its microwave dielectric properties. In this paper, we describe construction of a split-cylinder resonator and application of the apparatus in measuring dielectric properties of a diamond film, together with a sapphire and a single-crystal quartz thin film sample at Ka-band. Results show that the split-cylinder resonator could meet the requirement to measure microwave dielectric properties of low loss thin film materials such as diamond films.
{"title":"Measurement of microwave dielectric properties of low loss diamond film at Ka band using the split-cylinder resonator method","authors":"Yanqing Liu, M. Ding, J. Su, Jianmin She, W. Tang","doi":"10.1109/IVEC.2015.7224031","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7224031","url":null,"abstract":"The excellent properties of diamond films make it extremely attractive to apply the material in microwave vacuum devices, in particular in high-power conditions. However, low dielectric loss and small thickness (usual less than 0.5mm) of the material make it difficult to measure its microwave dielectric properties. In this paper, we describe construction of a split-cylinder resonator and application of the apparatus in measuring dielectric properties of a diamond film, together with a sapphire and a single-crystal quartz thin film sample at Ka-band. Results show that the split-cylinder resonator could meet the requirement to measure microwave dielectric properties of low loss thin film materials such as diamond films.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116573725","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}
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