Pub Date : 2015-04-27DOI: 10.1109/IVEC.2015.7224013
X. Lei, Lingna Yue, Yanyu Wei, Qian Li, Chong Ding, Jin Xu, Y. Gong, Xiaomeng Yang, T. Huang, Yixue Wei, Haihua Gong, Jinjun Feng
A novel and simple helix slow-wave structure (SWS) with low gain fluctuation is present. The high frequency characteristics and beam-wave interaction of this structure are calculated. The simulation results show that the gain of the novel helix traveling wave tube (TWT) is more than 58dB at Ka-band. At the same time, the gain fluctuation of the TWT is less than 6.2dB.
{"title":"A novel helix SWS for wide band TWT with low gain fluctuation","authors":"X. Lei, Lingna Yue, Yanyu Wei, Qian Li, Chong Ding, Jin Xu, Y. Gong, Xiaomeng Yang, T. Huang, Yixue Wei, Haihua Gong, Jinjun Feng","doi":"10.1109/IVEC.2015.7224013","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7224013","url":null,"abstract":"A novel and simple helix slow-wave structure (SWS) with low gain fluctuation is present. The high frequency characteristics and beam-wave interaction of this structure are calculated. The simulation results show that the gain of the novel helix traveling wave tube (TWT) is more than 58dB at Ka-band. At the same time, the gain fluctuation of the TWT is less than 6.2dB.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"20 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":"124386919","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.2015.7223942
Xiaoyang Zheng, L. Meng, Xiwei Tong
In order to meet microwave devices' growing demand on material's vacuum properties, the author carries out preliminary exploration of the process of material's outgassing and its causes, the diffusion characteristics of different gases in material. It is pointed out that on the basis of maintaining its original physical and chemical properties, material's vacuum properties can be improved by surface modification. At last, this paper compares the volumes of the emitted gases of stainless steel coated by TiN film and stainless steel without TiN film, after they are both roasted by high temperature. The result confirms that the surface modification, TiN film can improve the vacuum properties of the material.
{"title":"Material's outgassing and surface modification of TiN coating film","authors":"Xiaoyang Zheng, L. Meng, Xiwei Tong","doi":"10.1109/IVEC.2015.7223942","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223942","url":null,"abstract":"In order to meet microwave devices' growing demand on material's vacuum properties, the author carries out preliminary exploration of the process of material's outgassing and its causes, the diffusion characteristics of different gases in material. It is pointed out that on the basis of maintaining its original physical and chemical properties, material's vacuum properties can be improved by surface modification. At last, this paper compares the volumes of the emitted gases of stainless steel coated by TiN film and stainless steel without TiN film, after they are both roasted by high temperature. The result confirms that the surface modification, TiN film can improve the vacuum properties of the material.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"68 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":"114606683","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.2015.7223906
Xue Ming, Zhang Rui, Ding Yaogen, Wang Yong
This paper reports a numerical simulation for collector of klystron fluid flow and coupled heat transfer. The structure of collector using in the klystron was simplified. A numerical model of the collector was established by using ANSYS Workbench. Fluid velocity distribution, temperature rise and pressure drop condition inside the collector were obtained and analyzed. This research could be beneficial to the optimal design of cooling system in the klystron and other vacuum electron devices.
{"title":"Numerical simulation for the collector of klystron fluid flow and coupled heat transfer","authors":"Xue Ming, Zhang Rui, Ding Yaogen, Wang Yong","doi":"10.1109/IVEC.2015.7223906","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223906","url":null,"abstract":"This paper reports a numerical simulation for collector of klystron fluid flow and coupled heat transfer. The structure of collector using in the klystron was simplified. A numerical model of the collector was established by using ANSYS Workbench. Fluid velocity distribution, temperature rise and pressure drop condition inside the collector were obtained and analyzed. This research could be beneficial to the optimal design of cooling system in the klystron and other vacuum electron devices.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"365 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":"123948884","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.2015.7223837
Ping Wu, Jun Sun, Yibing Cao, Y. Teng
Cathode Plasma is a basic phenomenon in explosive electron emission (EEE). This paper addresses the plasma characteristics of annular explosive emission cathodes (EECs) with a framing camera. The plasma photographs show that the plasma development proceeds slower than the electron emission process and has a significant persistence effect which makes the cathode plasma need several microseconds to dissipate thoroughly after the high-voltage pulse. The photographs also show that the guiding magnetic field and cathode material have significant influences on emission uniformity of EECs.
{"title":"Characteristics of plasma process in explosive electron emission","authors":"Ping Wu, Jun Sun, Yibing Cao, Y. Teng","doi":"10.1109/IVEC.2015.7223837","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223837","url":null,"abstract":"Cathode Plasma is a basic phenomenon in explosive electron emission (EEE). This paper addresses the plasma characteristics of annular explosive emission cathodes (EECs) with a framing camera. The plasma photographs show that the plasma development proceeds slower than the electron emission process and has a significant persistence effect which makes the cathode plasma need several microseconds to dissipate thoroughly after the high-voltage pulse. The photographs also show that the guiding magnetic field and cathode material have significant influences on emission uniformity of EECs.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"76 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":"122629389","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.2015.7223950
Wenlong Chen, Q. Hu, Yu-Lu Hu, Tao Huang, Li Xu, Jianqing Li, Bin Li
A periodic permanent magnet (PPM) stack with notched magnet is discussed in this paper. A fully three dimensional (3D) magnetic focusing simulator (MFS) has been used to model the PPM stack with notched magnet. The influence of changing notched size of magnet is shown by MFS. And the influence of changing material's coercive field is also shown by MFS.
{"title":"The sensitivity analysis of the PPM stack with notched magnet","authors":"Wenlong Chen, Q. Hu, Yu-Lu Hu, Tao Huang, Li Xu, Jianqing Li, Bin Li","doi":"10.1109/IVEC.2015.7223950","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223950","url":null,"abstract":"A periodic permanent magnet (PPM) stack with notched magnet is discussed in this paper. A fully three dimensional (3D) magnetic focusing simulator (MFS) has been used to model the PPM stack with notched magnet. The influence of changing notched size of magnet is shown by MFS. And the influence of changing material's coercive field is also shown by MFS.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"4 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":"130390988","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.2015.7223877
Yabin Zhang, Zhanliang Wang, Yang Yang, Qing Zhou, Wenfei Bo, Xinyi Li, Shuaihong Liu, Xianbao Shi, Yanyu Wei, Z. Duan, H. Gong, Jinjun Feng, Y. Gong
Analysis of a Ka-band relativistic sheet beam traveling-wave-tube (RTWT) by simulation method is presented in this paper. The single grating rectangular waveguide is chosen for its slow wave structure (SWS) due to its flat shape, better transmission characteristics and superiority for fabrication, mechanical robustness. The high-frequency characteristic of the single-grating rectangular, the transmission characteristic of the RTWT and the interaction performance are investigated respectively.
{"title":"Ka-band traveling wave tube driving by relativistic sheet electron beam","authors":"Yabin Zhang, Zhanliang Wang, Yang Yang, Qing Zhou, Wenfei Bo, Xinyi Li, Shuaihong Liu, Xianbao Shi, Yanyu Wei, Z. Duan, H. Gong, Jinjun Feng, Y. Gong","doi":"10.1109/IVEC.2015.7223877","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223877","url":null,"abstract":"Analysis of a Ka-band relativistic sheet beam traveling-wave-tube (RTWT) by simulation method is presented in this paper. The single grating rectangular waveguide is chosen for its slow wave structure (SWS) due to its flat shape, better transmission characteristics and superiority for fabrication, mechanical robustness. The high-frequency characteristic of the single-grating rectangular, the transmission characteristic of the RTWT and the interaction performance are investigated respectively.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"49 11 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":"128968494","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.2015.7223931
Siyuan Ma, Jirun Luo, Zi-cheng Wang, Tong Feng
A structure for power probe of W-band power meter is designed under the premise of ensuring absorption rate and steady working of materials at high temperature. Basing on heat analysis ANSYS code, the temperature distribution of the probe has been simulated with 0-50mW input power. The designed probe meets the requirements of calibration and measurement according to the simulation results for temperature difference, heat-balance time and heat-withstanding capability of the material.
{"title":"Structural design for power probe of W-band power meter","authors":"Siyuan Ma, Jirun Luo, Zi-cheng Wang, Tong Feng","doi":"10.1109/IVEC.2015.7223931","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223931","url":null,"abstract":"A structure for power probe of W-band power meter is designed under the premise of ensuring absorption rate and steady working of materials at high temperature. Basing on heat analysis ANSYS code, the temperature distribution of the probe has been simulated with 0-50mW input power. The designed probe meets the requirements of calibration and measurement according to the simulation results for temperature difference, heat-balance time and heat-withstanding capability of the material.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"70 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":"122410731","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.2015.7223756
Tyler Rowe, N. Behdad, J. Booske
The resistive wall amplifier (RWA) has been shown to be theoretically capable of very high gains. However, properties of the materials necessary to support the practical resistive medium significantly reduce the effective gain of the device. This work investigates a metamaterial-enhanced RWA. We demonstrate theoretically that the use of metamaterials in RWAs enables very high, near-theoretical gains.
{"title":"Metamaterial-enhanced resistive wall amplifiers","authors":"Tyler Rowe, N. Behdad, J. Booske","doi":"10.1109/IVEC.2015.7223756","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223756","url":null,"abstract":"The resistive wall amplifier (RWA) has been shown to be theoretically capable of very high gains. However, properties of the materials necessary to support the practical resistive medium significantly reduce the effective gain of the device. This work investigates a metamaterial-enhanced RWA. We demonstrate theoretically that the use of metamaterials in RWAs enables very high, near-theoretical gains.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"25 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":"126016803","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}
This paper provided a briefly introduction to the features of pulsed YAG laser welding technology in the production of the electron gun for klystron. The theoretical basis of the laser welding for the electron gun has been discussed. Proper welding parameter of laser welding technology is concluded from the experimental research. The reliability of laser welding technology is also tested from the small batch production.
{"title":"Research on the processing technology of the electron gun for klystron using plused laser welding","authors":"Bofeng Wang, Guanli Zhou, Xuhua Hu, Jianyong Zhou, Xiaohua Li, Yongqing Zhang","doi":"10.1109/IVEC.2015.7223935","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223935","url":null,"abstract":"This paper provided a briefly introduction to the features of pulsed YAG laser welding technology in the production of the electron gun for klystron. The theoretical basis of the laser welding for the electron gun has been discussed. Proper welding parameter of laser welding technology is concluded from the experimental research. The reliability of laser welding technology is also tested from the small batch production.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"97 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":"127167401","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}
Frequency agility and tunability is necessary for many applications of high power microwave sources. Frequency characteristics of a distributed feedback resonant traveling wave tube with high efficiency are investigated in this paper. Frequency hopping of the device is achieved by controlling the longitudinal mode competition. The experiments have been carried out and high power microwave with dual-modes output are obtained. When the voltage is about 680 kV, microwave with power of 2.1GW, frequency of 9.3GHz and efficiency of 41% is generated. Meanwhile, microwave with power of 1.2GW, frequency of 10.3GHz and efficiency of 35% is also generated while the voltage is about 580kV.
{"title":"Frequency characteristics of a relativistic traveling wave tube","authors":"Wei Song, Yanchao Shi, Xiaoze Li, Ligang Zhang, W. Tan, Q. Ning, Xu Liang","doi":"10.1109/IVEC.2015.7223977","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223977","url":null,"abstract":"Frequency agility and tunability is necessary for many applications of high power microwave sources. Frequency characteristics of a distributed feedback resonant traveling wave tube with high efficiency are investigated in this paper. Frequency hopping of the device is achieved by controlling the longitudinal mode competition. The experiments have been carried out and high power microwave with dual-modes output are obtained. When the voltage is about 680 kV, microwave with power of 2.1GW, frequency of 9.3GHz and efficiency of 41% is generated. Meanwhile, microwave with power of 1.2GW, frequency of 10.3GHz and efficiency of 35% is also generated while the voltage is about 580kV.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"495 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":"127585224","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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