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}
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.2015.7223758
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.2015.7223844
Jiang Yi, Lei Wenqiang, Hu Linlin, Zhou Quanfeng, Hu Peng, Ma Guowu, Chen Hongbin
The design and simulation results for a 140 GHz gyro-amplifier are presented. A bandwidth of over 3 GHz has been achieved in simulation with peak saturated gain of over 33 dB. Study dispersion characteristic and beam-wave interaction of the confocal waveguide. The HE06 mode of a confocal waveguide is chosen as the operating mode and distributed loss is employed via diffraction to stabilize the circuit.
{"title":"Design of a 140 GHz confocal gyro-TWT amplifier","authors":"Jiang Yi, Lei Wenqiang, Hu Linlin, Zhou Quanfeng, Hu Peng, Ma Guowu, Chen Hongbin","doi":"10.1109/IVEC.2015.7223844","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223844","url":null,"abstract":"The design and simulation results for a 140 GHz gyro-amplifier are presented. A bandwidth of over 3 GHz has been achieved in simulation with peak saturated gain of over 33 dB. Study dispersion characteristic and beam-wave interaction of the confocal waveguide. The HE06 mode of a confocal waveguide is chosen as the operating mode and distributed loss is employed via diffraction to stabilize the circuit.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"7 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":"121919235","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.2015.7223971
Quanfeng Zhou, Rui Song, W. Lei, Yi Jiang, Peng Hu, Lei Yan, Guowu Ma, Hongbin Chen
A broadband 0.22THz folded waveguide traveling wave tube amplifier has been designed by analyzing its slow wave structure and simulating with PIC code. The folded waveguide traveling wave tube is proposed to be operating at 0.22THz, with a 3 dB bandwidth of more than 10GHz. The gain of this folded waveguide traveling wave tube is to be more than 13 dB, and the beam voltage is 14 kV. The first test of this prototype was accomplished in late 2014, which resulted in more than 12 dB at 0.22THz and with a 3dB bandwidth of 8.8 GHz. Tube design and test are presented in this paper.
{"title":"Development of a 0.22THz folded waveguide travelling wave tube","authors":"Quanfeng Zhou, Rui Song, W. Lei, Yi Jiang, Peng Hu, Lei Yan, Guowu Ma, Hongbin Chen","doi":"10.1109/IVEC.2015.7223971","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223971","url":null,"abstract":"A broadband 0.22THz folded waveguide traveling wave tube amplifier has been designed by analyzing its slow wave structure and simulating with PIC code. The folded waveguide traveling wave tube is proposed to be operating at 0.22THz, with a 3 dB bandwidth of more than 10GHz. The gain of this folded waveguide traveling wave tube is to be more than 13 dB, and the beam voltage is 14 kV. The first test of this prototype was accomplished in late 2014, which resulted in more than 12 dB at 0.22THz and with a 3dB bandwidth of 8.8 GHz. Tube design and test are presented in this paper.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"37 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":"117140103","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.2015.7223900
Fei Yan, D. Jin, Lei Chen, X. Wan
Penning-type ion source performance for neutron generator applications is characterized partly by the atomic ion fraction. A miniature Penning ion source has been fabricated to investigate the atomic ion fraction of the deuterium plasma by a mass-energy analyer. The energy for the mass settings of 2 and 4, corresponding to D+ and D2+ ions respectively, show Guass distributions. The results show that the atomic ion fraction could vary from 2.26% to 5.63% by changing the pressure, the anode voltage and the discharge current. The results can provide useful information for the choosing of the discharge conditions.
{"title":"Plasma diagnosis in a miniature penning ion source by a mass-energy analyer","authors":"Fei Yan, D. Jin, Lei Chen, X. Wan","doi":"10.1109/IVEC.2015.7223900","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223900","url":null,"abstract":"Penning-type ion source performance for neutron generator applications is characterized partly by the atomic ion fraction. A miniature Penning ion source has been fabricated to investigate the atomic ion fraction of the deuterium plasma by a mass-energy analyer. The energy for the mass settings of 2 and 4, corresponding to D+ and D2+ ions respectively, show Guass distributions. The results show that the atomic ion fraction could vary from 2.26% to 5.63% by changing the pressure, the anode voltage and the discharge current. The results can provide useful information for the choosing of the discharge conditions.","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":"115592744","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.2015.7223909
Yuchuan Zhang, Jun Sun, H. Shao, X. Bai, Xiaowei Zhang, Yibing Cao, Yuqin Liang, Jiawei Li
In this paper, the effect of the gases absorbed on the surface of the RBWO high-frequency structure and the background gases inside the system on the pulse duration of high power microwave is analyzed. To simulate the plasmas originating from the ionized gases, a PIC model is studied. Simulation results show that the microwave power declines and the pulse-duration decreases with plasma filled in the RBWO. Based on the simulation results, a method of baking for suppressing gas desorption is presented. The preliminary experimental results show that the pulse duration can be increased to 31ns by suppressing the gas desorption, while for the same microwave power, the pulse duration is only 19ns without treatment for the RBWO.
{"title":"Pulse duration extension of RBWO by suppressing gas desorption","authors":"Yuchuan Zhang, Jun Sun, H. Shao, X. Bai, Xiaowei Zhang, Yibing Cao, Yuqin Liang, Jiawei Li","doi":"10.1109/IVEC.2015.7223909","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223909","url":null,"abstract":"In this paper, the effect of the gases absorbed on the surface of the RBWO high-frequency structure and the background gases inside the system on the pulse duration of high power microwave is analyzed. To simulate the plasmas originating from the ionized gases, a PIC model is studied. Simulation results show that the microwave power declines and the pulse-duration decreases with plasma filled in the RBWO. Based on the simulation results, a method of baking for suppressing gas desorption is presented. The preliminary experimental results show that the pulse duration can be increased to 31ns by suppressing the gas desorption, while for the same microwave power, the pulse duration is only 19ns without treatment for the RBWO.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"143 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":"117053918","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.2015.7223850
Yang Shengmei, Su Wei, Wang Yajun
A novel fundamental mode multi-beam folded waveguide (FMMBFW) circuit, which can enhance the output power and interaction efficiency of terahertz (THz) traveling wave tubes (TWT), is proposed in this paper. Results show that the D-band FMMBFW circuit with three beams can produce 21.78 W peak output power and 6.34 % electronic efficiency at 0.14 THz.
{"title":"Analysis of D-band fundamental mode multi-beam folded waveguide TWT","authors":"Yang Shengmei, Su Wei, Wang Yajun","doi":"10.1109/IVEC.2015.7223850","DOIUrl":"https://doi.org/10.1109/IVEC.2015.7223850","url":null,"abstract":"A novel fundamental mode multi-beam folded waveguide (FMMBFW) circuit, which can enhance the output power and interaction efficiency of terahertz (THz) traveling wave tubes (TWT), is proposed in this paper. Results show that the D-band FMMBFW circuit with three beams can produce 21.78 W peak output power and 6.34 % electronic efficiency at 0.14 THz.","PeriodicalId":435469,"journal":{"name":"2015 IEEE International Vacuum Electronics Conference (IVEC)","volume":"50 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":"123815695","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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