Pub Date : 2015-04-27DOI: 10.1109/IVEC.2015.7223789
J. Spicer, D. Busbaher
In order to operate at optimum emission current density, dispenser cathodes must achieve a specific temperature while a specific heater power is applied. A coiled wire heater is commonly used to generate this power. 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. Printed ceramic heater technology exists, but, to date, has not been usable in dispenser cathodes due to the manufacturing tolerances. This paper discusses the present status of a project to use ink-jetted tungsten particles on a ceramic substrate as an alternate approach to the multi-layer heater design.
{"title":"Further developments in multi-layer heaters for use in dispenser cathodes","authors":"J. Spicer, D. Busbaher","doi":"10.1109/IVEC.2015.7223789","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223789","url":null,"abstract":"In order to operate at optimum emission current density, dispenser cathodes must achieve a specific temperature while a specific heater power is applied. A coiled wire heater is commonly used to generate this power. 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. Printed ceramic heater technology exists, but, to date, has not been usable in dispenser cathodes due to the manufacturing tolerances. This paper discusses the present status of a project to use ink-jetted tungsten particles on a ceramic substrate as an alternate approach to the multi-layer heater design.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"89 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":"122634701","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.2015.7223760
Ming-Shing Lin, Shi-ming Lin, Chiang Y. Wei, Kuang L. Wu, L. Barnett, K. Chu
We present the theory and experimental observation on the polarization-charge shielding effects in microwave heating. A wood-stick sample is irradiated by a uniform traveling wave in an anechoic chamber. As a result of polarization-charge shielding, the heating rate is shown to be highly dependent on the orientation of the sample with respect to the wave electric field.
{"title":"Effects of polarization-charge shielding in microwave heating","authors":"Ming-Shing Lin, Shi-ming Lin, Chiang Y. Wei, Kuang L. Wu, L. Barnett, K. Chu","doi":"10.1109/IVEC.2015.7223760","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223760","url":null,"abstract":"We present the theory and experimental observation on the polarization-charge shielding effects in microwave heating. A wood-stick sample is irradiated by a uniform traveling wave in an anechoic chamber. As a result of polarization-charge shielding, the heating rate is shown to be highly dependent on the orientation of the sample with respect to the wave electric field.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"92 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":"122908864","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.2015.7223904
Bin Shen, Yao-gen Ding, Zhaochuan Zhang, Hong-hong Gu, Caiying Wang
A new type of S-band multi-beam klystron (MBK) with peak power of 1.5MW is developing at IECAS. The design of the electron optics system, RF interaction section and broadband output coupling systems of the MBK will be described in this paper. Also some cold measurement results of the tube will be presented.
{"title":"The design of S-band 1.5MW high power multi-beam klystron","authors":"Bin Shen, Yao-gen Ding, Zhaochuan Zhang, Hong-hong Gu, Caiying Wang","doi":"10.1109/IVEC.2015.7223904","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223904","url":null,"abstract":"A new type of S-band multi-beam klystron (MBK) with peak power of 1.5MW is developing at IECAS. The design of the electron optics system, RF interaction section and broadband output coupling systems of the MBK will be described in this paper. Also some cold measurement results of the tube will be presented.","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":"132551124","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.2015.7223957
Yanshuai Wang, Z. Duan, Xiang Huang, Xinwu Ma, Xianfeng Tang, Zhanliang Wang, Jinjun Feng, Y. Gong
We propose a metamaterial slow-wave structure (SWS) which is composed of a circular waveguide periodically loaded with complementary electric split ring resonators (CeSRRs). The high-frequency characteristics of the metamaterial SWS have been studied, and the simulation results reveal that it is a kind of SWS of higher interaction impedance. An S-band metamaterial microwave radiation source is calculated by particle-in-cell (PIC) simulation, the results show that it is a potential high-power microwave radiation source.
{"title":"Metamaterial-based high-power microwave radiation sources","authors":"Yanshuai Wang, Z. Duan, Xiang Huang, Xinwu Ma, Xianfeng Tang, Zhanliang Wang, Jinjun Feng, Y. Gong","doi":"10.1109/IVEC.2015.7223957","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223957","url":null,"abstract":"We propose a metamaterial slow-wave structure (SWS) which is composed of a circular waveguide periodically loaded with complementary electric split ring resonators (CeSRRs). The high-frequency characteristics of the metamaterial SWS have been studied, and the simulation results reveal that it is a kind of SWS of higher interaction impedance. An S-band metamaterial microwave radiation source is calculated by particle-in-cell (PIC) simulation, the results show that it is a potential high-power microwave radiation source.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"36 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":"134477462","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}
A double anode magnetron injected gun (MIG) for a terahertz (THz) band cyclotron oscillation tube has been presented in this paper. Through design, simulation and optimization by the particle-in-cell (PIC) code, a double-anode electron gun with trans-velocity spread of 3.19% is obtained, and the ratio of the transverse velocity to the axial velocity is equal to 1.4. The designed electron gun well satisfies the requirement of the 0.4 THz gyrotron.
{"title":"Design and simulation of a magnetron injected electronic gun for 0.4 THz gyrotron","authors":"Yanyan Zhang, Sheng Yu, Tianzhong Zhang, Qixiang Zhao, Youwei Yang, Zhipeng Wang, Qiuling Mou, X. Niu, Ying-hui Liu","doi":"10.1109/IVEC.2015.7223918","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223918","url":null,"abstract":"A double anode magnetron injected gun (MIG) for a terahertz (THz) band cyclotron oscillation tube has been presented in this paper. Through design, simulation and optimization by the particle-in-cell (PIC) code, a double-anode electron gun with trans-velocity spread of 3.19% is obtained, and the ratio of the transverse velocity to the axial velocity is equal to 1.4. The designed electron gun well satisfies the requirement of the 0.4 THz gyrotron.","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":"130304962","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.2015.7224006
Dongping Gao, Rui Zhang, Haibing Ding, Ke Tang
Magnetron, as a kind of high-power high-efficiency and low-cost microwave generator, has been widely improved and used since 1930s. For industrial utility, magnetron with CW output power of 75 kW operating in 915 MHz is widely used. Therefore, one type of water load with tolerance of 100 kW is developed for the convenience of high power test. Three type of materials, ceramic, mica, Teflon are considered to be used as microwave window of water load. According to simulation result, its VSWR is optimized to be less than 1.08, 1.25 and 1.5 within a bandwidth of 100 MHz for ceramic, mica and Teflon respectively.
{"title":"Design of 100kW water load for P-band Continuous Wave Magnetron","authors":"Dongping Gao, Rui Zhang, Haibing Ding, Ke Tang","doi":"10.1109/IVEC.2015.7224006","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7224006","url":null,"abstract":"Magnetron, as a kind of high-power high-efficiency and low-cost microwave generator, has been widely improved and used since 1930s. For industrial utility, magnetron with CW output power of 75 kW operating in 915 MHz is widely used. Therefore, one type of water load with tolerance of 100 kW is developed for the convenience of high power test. Three type of materials, ceramic, mica, Teflon are considered to be used as microwave window of water load. According to simulation result, its VSWR is optimized to be less than 1.08, 1.25 and 1.5 within a bandwidth of 100 MHz for ceramic, mica and Teflon respectively.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"33 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":"122884363","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.2015.7223823
Jiawei Li, Wen-hua Huang, R. Xiao, Yuchuan Zhang, Tiezhu Liang, X. Cui, Xiaoyue Xing, H. Shao, Changhua Chen, Qi Zhu
This paper presents the design of a circular waveguide TM01 mode combiner with high power capacity for phased locked high power devices. Considering the characteristic of the TM01 mode, two high power sources are injected co-axially into a radial waveguide structure with rectangular coupling apertures symmetrically placed on the cylindrical profile of the circular waveguide. The microwaves generated by two phase locked high power devices with the same phase are extracted by magnetic coupling. Then, the extracted microwaves travel through the rectangular waveguides separately, and are combined by the other radial waveguide with shorted wall. Circular cavities along the input waveguides are employed and provide reflections to eliminate the transmitted power from one source to the other and match the combiner. Simulation results show that the TM01 mode combiner at X-band possess GW level power capacity and combination efficiency up to 97%.
{"title":"A compact TM01 mode combiner for phase locked high power devices","authors":"Jiawei Li, Wen-hua Huang, R. Xiao, Yuchuan Zhang, Tiezhu Liang, X. Cui, Xiaoyue Xing, H. Shao, Changhua Chen, Qi Zhu","doi":"10.1109/IVEC.2015.7223823","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223823","url":null,"abstract":"This paper presents the design of a circular waveguide TM01 mode combiner with high power capacity for phased locked high power devices. Considering the characteristic of the TM01 mode, two high power sources are injected co-axially into a radial waveguide structure with rectangular coupling apertures symmetrically placed on the cylindrical profile of the circular waveguide. The microwaves generated by two phase locked high power devices with the same phase are extracted by magnetic coupling. Then, the extracted microwaves travel through the rectangular waveguides separately, and are combined by the other radial waveguide with shorted wall. Circular cavities along the input waveguides are employed and provide reflections to eliminate the transmitted power from one source to the other and match the combiner. Simulation results show that the TM01 mode combiner at X-band possess GW level power capacity and combination efficiency up to 97%.","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":"125224473","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.2015.7223808
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.2015.7223984
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}
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