Pub Date : 2011-02-21DOI: 10.1109/IVEC.2011.5747061
P. Sidharthan, K. Mirjith, A. J. Zabiulla, S. Kamath
A fast response modulator was designed and developed for using in a broadband Microwave Power Module operating in C-X-Ku band with output power delivery of 100 W. The modulator incorporates a low latency logic and protection module implemented in a CPLD floating at the cathode potential. The compactness demanded by the MPM was tackled through innovative design using dual-sided 3-tier multi-layer PCBs accommodating SMD components and an integrated planar transformer. The fast response and agility to handle high PRF up to 150 kHz in repetitive mode and 3 MHz in burst mode makes this MPM a good candidate for radar and EW systems.
{"title":"Development of a fast switching modulator for an MPM","authors":"P. Sidharthan, K. Mirjith, A. J. Zabiulla, S. Kamath","doi":"10.1109/IVEC.2011.5747061","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5747061","url":null,"abstract":"A fast response modulator was designed and developed for using in a broadband Microwave Power Module operating in C-X-Ku band with output power delivery of 100 W. The modulator incorporates a low latency logic and protection module implemented in a CPLD floating at the cathode potential. The compactness demanded by the MPM was tackled through innovative design using dual-sided 3-tier multi-layer PCBs accommodating SMD components and an integrated planar transformer. The fast response and agility to handle high PRF up to 150 kHz in repetitive mode and 3 MHz in burst mode makes this MPM a good candidate for radar and EW systems.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115324194","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5747104
C. Chua, S. Aditya, Z. Shen, Min Tang, J. Tsai
A printed planar helix with straight-edge connections has been simulated with a sheet electron beam, which has an elliptical cross-section and is centered in the planar helix. The amplification of the input signal as well as the mode of propagation has been examined. A gain of 15 dB at 4.75GHz is observed for a beam current of 32 mA.
{"title":"Planar helix with straight-edge connections and a sheet electron beam for traveling-wave tube applications","authors":"C. Chua, S. Aditya, Z. Shen, Min Tang, J. Tsai","doi":"10.1109/IVEC.2011.5747104","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5747104","url":null,"abstract":"A printed planar helix with straight-edge connections has been simulated with a sheet electron beam, which has an elliptical cross-section and is centered in the planar helix. The amplification of the input signal as well as the mode of propagation has been examined. A gain of 15 dB at 4.75GHz is observed for a beam current of 32 mA.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114430510","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5747030
M. Zhang, Honglai Zhang, Shiji Yu, Pukun Liu
In this paper, a new type RV dispenser cathode is developed as it is capable of meeting the growing requirements concerning life and current density. This kind of RV dispenser cathode shows the higher emission current density and longer lifetime than that of convention dispenser cathodes. Temperature and current accelerated life test are used to evaluate the new type cathodes. At present, the results for temperature accelerated life test show that predicted life of the RV dispenser cathodes exceeds 260,000 hours at a current density of 1.5A/cm2 at 980°C.
{"title":"Life test studies on RV dispenser cathode life test studies on RV dispenser cathode","authors":"M. Zhang, Honglai Zhang, Shiji Yu, Pukun Liu","doi":"10.1109/IVEC.2011.5747030","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5747030","url":null,"abstract":"In this paper, a new type RV dispenser cathode is developed as it is capable of meeting the growing requirements concerning life and current density. This kind of RV dispenser cathode shows the higher emission current density and longer lifetime than that of convention dispenser cathodes. Temperature and current accelerated life test are used to evaluate the new type cathodes. At present, the results for temperature accelerated life test show that predicted life of the RV dispenser cathodes exceeds 260,000 hours at a current density of 1.5A/cm2 at 980°C.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127244191","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5746962
H. Han, Yong Wang
Parasitic mode suppression was studied by the electromagnetic theory. The method of increasing the frequency interval (FI) between operating mode and parasitic mode was proposed to suppress the unwanted mode. In order to increase FI, a pair of metal rings (MR) is installed in the coaxial resonator operating at high-order-mode for multi-beam klystron (MBK). A TM310 mode coaxial resonator has been manufactured and tested and the FI between TM310 mode and its neighboring modes both are raised to more than 1.0 GHz in X-band.
{"title":"Parasitic mode suppression in coaxial resonator for MBK","authors":"H. Han, Yong Wang","doi":"10.1109/IVEC.2011.5746962","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5746962","url":null,"abstract":"Parasitic mode suppression was studied by the electromagnetic theory. The method of increasing the frequency interval (FI) between operating mode and parasitic mode was proposed to suppress the unwanted mode. In order to increase FI, a pair of metal rings (MR) is installed in the coaxial resonator operating at high-order-mode for multi-beam klystron (MBK). A TM310 mode coaxial resonator has been manufactured and tested and the FI between TM310 mode and its neighboring modes both are raised to more than 1.0 GHz in X-band.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127392783","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5747055
Feng Gao, Mei Xiao, Xiaobing Zhang, W. Lei
Carbon nanotubes (CNTs) have excellent performance in field emission; they can be used as field emission (FE) cold cathode. In this paper, we used thermal chemical vapor deposition to synthesize CNTs directly on the surface of traditional thermal-cathode; we changed the sputtering time of catalyst and found that it had a major impact on the emission properties, some discussion were also give.
{"title":"Preparation of high field emission current carbon nanotubes by chemical-vapor deposition","authors":"Feng Gao, Mei Xiao, Xiaobing Zhang, W. Lei","doi":"10.1109/IVEC.2011.5747055","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5747055","url":null,"abstract":"Carbon nanotubes (CNTs) have excellent performance in field emission; they can be used as field emission (FE) cold cathode. In this paper, we used thermal chemical vapor deposition to synthesize CNTs directly on the surface of traditional thermal-cathode; we changed the sputtering time of catalyst and found that it had a major impact on the emission properties, some discussion were also give.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127560567","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5746907
A. Kurayev, T. L. Popkova, A. Rak
The method of even sampling for solution of the ordinary differential equation is proposed. It's high effectivetily is demonstrated in example of the propagation of H01-mode in irregular waveguide with circular section.
{"title":"Even sampling for the simulation of the electron devices with irregular electrodynamic systems","authors":"A. Kurayev, T. L. Popkova, A. Rak","doi":"10.1109/IVEC.2011.5746907","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5746907","url":null,"abstract":"The method of even sampling for solution of the ordinary differential equation is proposed. It's high effectivetily is demonstrated in example of the propagation of H01-mode in irregular waveguide with circular section.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126741209","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5746916
W. Peng, Yixue Wei, Yu-Lu Hu, Zhonghai Yang, Jianqing Li, Bin Li
A one dimensional nonlinear time-dependent theory for helix traveling wave tubes in beam-wave interaction is studied. A generalized electromagnetic field is applied to the expression of radio frequency field. The substitution of a spatial average over a wavelength for a time average over a wave period is used in the equation of radio frequency field. The space charge field of electron beam is treated by space charge wave model in company with the space charge coefficient. The effect of radio frequency field and space charge field to electrons is processed by the equations of the electron's energy and phase. A simulating result of the time-dependent model is given.
{"title":"A nonlinear time-dependent simulation for helix traveling wave tubes","authors":"W. Peng, Yixue Wei, Yu-Lu Hu, Zhonghai Yang, Jianqing Li, Bin Li","doi":"10.1109/IVEC.2011.5746916","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5746916","url":null,"abstract":"A one dimensional nonlinear time-dependent theory for helix traveling wave tubes in beam-wave interaction is studied. A generalized electromagnetic field is applied to the expression of radio frequency field. The substitution of a spatial average over a wavelength for a time average over a wave period is used in the equation of radio frequency field. The space charge field of electron beam is treated by space charge wave model in company with the space charge coefficient. The effect of radio frequency field and space charge field to electrons is processed by the equations of the electron's energy and phase. A simulating result of the time-dependent model is given.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126555445","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5746990
P. V. Krishna, M. Kartikeyan, M. Thumm
This paper presents the design studies of the output system of a 95 GHz, 100 kW, CW Gyrotron for ECRH7ECRIS applications. During this course, the design studies of an advanced dimpled-wall quasi optical launcher, non-linear taper and RF window will be carried out.
{"title":"Design studies of the output system of a 95 GHz, 100 KW, CW Gyrotron","authors":"P. V. Krishna, M. Kartikeyan, M. Thumm","doi":"10.1109/IVEC.2011.5746990","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5746990","url":null,"abstract":"This paper presents the design studies of the output system of a 95 GHz, 100 kW, CW Gyrotron for ECRH7ECRIS applications. During this course, the design studies of an advanced dimpled-wall quasi optical launcher, non-linear taper and RF window will be carried out.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124479023","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5747017
D. Gamzina, R. Barchfeld, L. Barnett, N. Luhmann, Y. Shin
To satisfy the growing interest in high power (∼1–200 W) THz sources, our research group has been working on various technologies to miniaturize vacuum electronic devices while keeping the power levels high and offering wide instantaneous bandwidth operation. We are exploring several methods for manufacturing 0.22 THz circuits including LIGA, silicon DRIE, and nano machining. Manufacturing circuits using micro-processing techniques allows multiple circuits to be made at a time, but the process is complex and requires perfection. On the other hand, nano machining allows for rapid prototyping of any circuit or coupler design. We were able to directly machine and test 0.22 THz circuits in various materials with transmission losses around 5–15 dB and with wide bandwidth.
{"title":"Nano CNC milling technology for terahertz vacuum electronic devices","authors":"D. Gamzina, R. Barchfeld, L. Barnett, N. Luhmann, Y. Shin","doi":"10.1109/IVEC.2011.5747017","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5747017","url":null,"abstract":"To satisfy the growing interest in high power (∼1–200 W) THz sources, our research group has been working on various technologies to miniaturize vacuum electronic devices while keeping the power levels high and offering wide instantaneous bandwidth operation. We are exploring several methods for manufacturing 0.22 THz circuits including LIGA, silicon DRIE, and nano machining. Manufacturing circuits using micro-processing techniques allows multiple circuits to be made at a time, but the process is complex and requires perfection. On the other hand, nano machining allows for rapid prototyping of any circuit or coupler design. We were able to directly machine and test 0.22 THz circuits in various materials with transmission losses around 5–15 dB and with wide bandwidth.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125019622","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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