Pub Date : 2015-04-27DOI: 10.1109/IVEC.2015.7223758
Shaomeng Wang, Chengxi Zhao, S. Aditya, C. Chua
The thermal analysis of a Ka-band slow-wave structure (SWS) consisting of a planar helix with straight edge connections (PH-SEC) has been carried out using CST as well as ANSYS. The thermal loss of the PH-SEC is calculated first and is used as the heat source in the thermal analysis. The temperature profile and the maximum temperature as a function of the dissipated power have been obtained. It is shown that the maximum temperature for the planar helix SWS is significantly lower than that for a corresponding conventional circular helix.
{"title":"Thermal characteristics of a Ka-band planar helix slow-wave structure","authors":"Shaomeng Wang, Chengxi Zhao, S. Aditya, C. Chua","doi":"10.1109/IVEC.2015.7223758","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223758","url":null,"abstract":"The thermal analysis of a Ka-band slow-wave structure (SWS) consisting of a planar helix with straight edge connections (PH-SEC) has been carried out using CST as well as ANSYS. The thermal loss of the PH-SEC is calculated first and is used as the heat source in the thermal analysis. The temperature profile and the maximum temperature as a function of the dissipated power have been obtained. It is shown that the maximum temperature for the planar helix SWS is significantly lower than that for a corresponding conventional circular helix.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"21 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":"134005057","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.2015.7223772
R. Jacobs, D. Morgan, J. Booske
Strontium vanadate, SrVO3, is a transition metal perovskite oxide with a low predicted work function of 1.79 eV using Density Functional Theory. Alloying SrVO3 with Ba resulted in Ba segregation to the emitting surface, producing an ultra-low work function of only 1.07 eV. This Ba-enriched emitting surface is predicted to be very long-lived compared to Ba-impregnated W and scandate cathodes.
{"title":"Strontium vanadate: An ultra-low work function electron emission material","authors":"R. Jacobs, D. Morgan, J. Booske","doi":"10.1109/IVEC.2015.7223772","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223772","url":null,"abstract":"Strontium vanadate, SrVO3, is a transition metal perovskite oxide with a low predicted work function of 1.79 eV using Density Functional Theory. Alloying SrVO3 with Ba resulted in Ba segregation to the emitting surface, producing an ultra-low work function of only 1.07 eV. This Ba-enriched emitting surface is predicted to be very long-lived compared to Ba-impregnated W and scandate cathodes.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"127 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":"116579990","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.2015.7223978
T. Tang, Wentao Dai, H. Gong, Y. Gong, Jinjun Feng
The electron beam noise in traveling wave tube was simulated by a one dimensional Lagrange model. The analysis conformed the predication of the noise theory of the space charge wave.
用一维拉格朗日模型模拟了电子束在行波管中的噪声。分析结果符合空间电荷波噪声理论的预测。
{"title":"Numerical simulation of noise in traveling wave tube","authors":"T. Tang, Wentao Dai, H. Gong, Y. Gong, Jinjun Feng","doi":"10.1109/IVEC.2015.7223978","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223978","url":null,"abstract":"The electron beam noise in traveling wave tube was simulated by a one dimensional Lagrange model. The analysis conformed the predication of the noise theory of the space charge wave.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"17 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":"116999909","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.2015.7223922
Zhang Tian-zhong, Yu Sheng, Zhang Yan-yan, Zhao Qi-xiang, Li Xiang
A quasi-optical mode converter (QOMC) for a 0.42THz TE17,4 mode gyrotron has been designed by theoretical analysis, numerical calculation, 3D simulation in this paper. The QOMC consists of a Denisov launcher and a set of beam-forming mirrors. The operation of the Denisov launcher has been analyzed by the coupling mode theory. The mirrors are used to form the beam-forming mirrors system. The vector diffraction theory is used to calculate the fields on the mirrors. A full 3D electromagnetic analysis of the integrated QOMC has been done. Results show that a conversion efficient of more than 98.1% has been obtained. Results of 3D simulations are in good agreement with the design calculation.
{"title":"Designed of a quasi-optical mode converter for 0.42THz high order mode gyrotron","authors":"Zhang Tian-zhong, Yu Sheng, Zhang Yan-yan, Zhao Qi-xiang, Li Xiang","doi":"10.1109/IVEC.2015.7223922","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223922","url":null,"abstract":"A quasi-optical mode converter (QOMC) for a 0.42THz TE17,4 mode gyrotron has been designed by theoretical analysis, numerical calculation, 3D simulation in this paper. The QOMC consists of a Denisov launcher and a set of beam-forming mirrors. The operation of the Denisov launcher has been analyzed by the coupling mode theory. The mirrors are used to form the beam-forming mirrors system. The vector diffraction theory is used to calculate the fields on the mirrors. A full 3D electromagnetic analysis of the integrated QOMC has been done. Results show that a conversion efficient of more than 98.1% has been obtained. Results of 3D simulations are in good agreement with the design calculation.","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":"134250943","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.2015.7223984
Qiang Zhang, Y. Hu, Tianyi Li, Jinjun Feng, Fujiang Liao
Integrated TWT based on the multi-beams interaction in the limited space is proposed in this paper. Four channels integrated TWT's electron gun and the beam transmission of the tube is simulated by software opera-3D. The design has been a viable integrated TWT electron optical system solutions,and the electron gun statics fluent can reach at least 99%, which provides the foundation for the design of the tube.
{"title":"Four channels integrated TWT electron optical system design and optimization","authors":"Qiang Zhang, Y. Hu, Tianyi Li, Jinjun Feng, Fujiang Liao","doi":"10.1109/IVEC.2015.7223984","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223984","url":null,"abstract":"Integrated TWT based on the multi-beams interaction in the limited space is proposed in this paper. Four channels integrated TWT's electron gun and the beam transmission of the tube is simulated by software opera-3D. The design has been a viable integrated TWT electron optical system solutions,and the electron gun statics fluent can reach at least 99%, which provides the foundation for the design of the tube.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"21 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":"134640018","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.2015.7223808
A. Darmaev, D. Komarov, S. Morev, E. Muraviev
An analytical solution for the longitudinal and radial components of magnetic field density was discovered in magnetic field potential approximation for the cell of periodic magnetic focusing system (PPM) with the central ring-shaped insert and T-shaped pole pieces.
{"title":"Approximate solution for the magnetic field distribution in the cell of the periodical magnetic focusing system","authors":"A. Darmaev, D. Komarov, S. Morev, E. Muraviev","doi":"10.1109/IVEC.2015.7223808","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223808","url":null,"abstract":"An analytical solution for the longitudinal and radial components of magnetic field density was discovered in magnetic field potential approximation for the cell of periodic magnetic focusing system (PPM) with the central ring-shaped insert and T-shaped pole pieces.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"16 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":"134395747","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.2015.7223839
C. Ruan, M. Zhang
The design of a wideband W-Band travelling wave tube using the staggered double-vane slow-wave structure combined with plan alignment three pencil beams is described in this paper. A more simple new type input and output coupler is brought forward with high transmission characteristics and short beam-wave interaction length for the easily beam transport and structures fabrication later. Particle in cell (PIC) simulations predict that when the beam voltage is of 22kV and beam current of 3×140 mA respectively, the travelling wave tube can produce over 2.25 kW of peak power within the total length of 70mm, also with a corresponding gain of 43 dB and an electronic efficiency of 12% at 94 GHz. And the 3 dB bandwidth can be achieved about 15 GHz.
{"title":"Design of a W-band plan alignment multiple beam travelling wave tube","authors":"C. Ruan, M. Zhang","doi":"10.1109/IVEC.2015.7223839","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223839","url":null,"abstract":"The design of a wideband W-Band travelling wave tube using the staggered double-vane slow-wave structure combined with plan alignment three pencil beams is described in this paper. A more simple new type input and output coupler is brought forward with high transmission characteristics and short beam-wave interaction length for the easily beam transport and structures fabrication later. Particle in cell (PIC) simulations predict that when the beam voltage is of 22kV and beam current of 3×140 mA respectively, the travelling wave tube can produce over 2.25 kW of peak power within the total length of 70mm, also with a corresponding gain of 43 dB and an electronic efficiency of 12% at 94 GHz. And the 3 dB bandwidth can be achieved about 15 GHz.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"60 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":"133272173","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.2015.7223936
X. Qi, C. Du, Li Luo, Bin Huang, Zheng-Di Li, Pu‐Kun Liu
The nonlinear analysis of a 330 GHz second-harmonic TE94 mode low-voltage gyrotron is presented in this paper. With electron beam of voltage 20 kV and current 0.5 A, the interaction circuit is optimized to achieve efficiency up to 13.6%. Based on nonlinear analysis, mode competition of the gyrotron is preliminarily revealed. The gyrotron is promising to be applied in 500MHz dynamic nuclear polarization enhanced nuclear magnetic resonance (DNP-NMR).
{"title":"Nonlinear analysis of a 330 GHz second-harmonic low-voltage gyrotron","authors":"X. Qi, C. Du, Li Luo, Bin Huang, Zheng-Di Li, Pu‐Kun Liu","doi":"10.1109/IVEC.2015.7223936","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223936","url":null,"abstract":"The nonlinear analysis of a 330 GHz second-harmonic TE94 mode low-voltage gyrotron is presented in this paper. With electron beam of voltage 20 kV and current 0.5 A, the interaction circuit is optimized to achieve efficiency up to 13.6%. Based on nonlinear analysis, mode competition of the gyrotron is preliminarily revealed. The gyrotron is promising to be applied in 500MHz dynamic nuclear polarization enhanced nuclear magnetic resonance (DNP-NMR).","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"16 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":"131612969","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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