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4th IEEE International Conference on Vacuum Electronics, 2003最新文献

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Power efficiency enhancement of a coaxial virtual cathode oscillator with ring-type reflector 带环形反射器的同轴虚阴极振荡器功率效率的提高
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286371
E. Choi, K. Y. Sung, W. Jeon, S. H. Chun, K. B. Song, Y. Jung, M. C. Choi, Y. Seo, H. Uhm
{"title":"Power efficiency enhancement of a coaxial virtual cathode oscillator with ring-type reflector","authors":"E. Choi, K. Y. Sung, W. Jeon, S. H. Chun, K. B. Song, Y. Jung, M. C. Choi, Y. Seo, H. Uhm","doi":"10.1109/IVEC.2003.1286371","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286371","url":null,"abstract":"We have investigated simulation and experimental studies on the high power microwave generation from virtual cathode oscillator (vircator) in a coaxial geometry. It consists of a coaxial annular cathode and cylindrical mesh anode. This high power microwave generator is powered by the \"Chondong\" intense relativistic electron beam pulser (Max: 600 kV, 88 kA and 60 ns duration). It is noted that the microwave power can be further enhanced by adding a reflector to the coaxial vircator. The microwave output power depends sensitively on the position and geometry of the reflector. It is observed that the output microwave power is measured to be about 400 MW and its conversion efficiency is about 6%. The frequency of the observed output microwave has been measured to be about 5.6 GHz, which is in good agreement with that of simulation. The dominant mode of output microwave is also shown to be a TM01 mode from a simulation with a 3 dimensional particle-in-cell (PIC) code called MAGIC.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126907677","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}
引用次数: 1
Numerical analysis of ring-loop and ring-bar slow wave structures for travelling wave tubes 行波管环形和环杆慢波结构的数值分析
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286030
D. Dyson, M. Clark, V. H. Smith
{"title":"Numerical analysis of ring-loop and ring-bar slow wave structures for travelling wave tubes","authors":"D. Dyson, M. Clark, V. H. Smith","doi":"10.1109/IVEC.2003.1286030","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286030","url":null,"abstract":"The paper describes the use of numerical methods to precisely predict the characteristics of ring-Loop & ring-Bar slow wave structures and provides examples of the close agreement obtainable between predicted and actual measured performance of TWTs. The microwave properties of the structures have been modelled using a commercially available 3D, high frequency electromagnetic, software package, founded on use of the finite element method.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128140021","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}
引用次数: 2
A study on the characteristic of conversion efficiency by low energy electron irradiated effect on C-S solar cells 低能电子辐照对C-S太阳能电池转换效率特性的研究
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286145
J. Yoon, Byung-Bog Kang, I. Cha, S. O. Jo
{"title":"A study on the characteristic of conversion efficiency by low energy electron irradiated effect on C-S solar cells","authors":"J. Yoon, Byung-Bog Kang, I. Cha, S. O. Jo","doi":"10.1109/IVEC.2003.1286145","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286145","url":null,"abstract":"This paper about the small electron beam irradiator for solar cell's efficiency. Many things are studied by method to increase conversion efficiency of solar cell. We selected electron beam by method for conversion efficiency of solar cell. Energy bands of this electron beam irradiator is 80 keV (max.). And, solar cells that apply in this paper are crystal S. Average efficiency of solar cell that applies in this experiment is 10%. This system manufactured small size electron beam irradiator. And, electron beam irradiation to solar cell in vacuum chamber of this irradiator. Irradiation area is 20*20 [mm/sup 2/] by 30/spl sim/70 [keV].","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127100592","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}
引用次数: 0
Development of X-band and Q-band travelling-wave-tube amplifiers x波段和q波段行波管放大器的研制
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286083
Y. Na, J. Choi, R. S. Kim
{"title":"Development of X-band and Q-band travelling-wave-tube amplifiers","authors":"Y. Na, J. Choi, R. S. Kim","doi":"10.1109/IVEC.2003.1286083","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286083","url":null,"abstract":"An X-band helix traveling wave tube (TWT) amplifier is designed, fabricated and tested. X-band helix circuit is designed by the use of the Sheath helix theory and HFSS code. A cold-test helix circuit is fabricated and tested to examine TWT dispersion characteristics and beam wave interaction impedance.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127473687","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}
引用次数: 7
High harmonic excitations in relativistic electron-beam propagation 相对论电子束传播中的高谐波激发
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286386
H. Uhm
{"title":"High harmonic excitations in relativistic electron-beam propagation","authors":"H. Uhm","doi":"10.1109/IVEC.2003.1286386","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286386","url":null,"abstract":"In this paper, we reinvestigate the properties of the electron beam propagation, particularly concentrating on high harmonic excitations caused by the beam current modulation during propagation, harmonic modes are generated in power klystrons. Propagation properties of intense relativistic electron beams have been investigated for various applications including high power microwave generations and amplifications, sterilizations, electron beam weldings, electron beam sputterings, and beam-plasma interactions. Theoretical model of the harmonic excitations in the beam current modulation is developed by self-consistent nonlinear theory.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124949254","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}
引用次数: 4
The effects of adsorbates on the field emission properties of multiwall carbon nanotubes 吸附剂对多壁碳纳米管场发射性能的影响
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286114
K. Yeong, J. Thong
{"title":"The effects of adsorbates on the field emission properties of multiwall carbon nanotubes","authors":"K. Yeong, J. Thong","doi":"10.1109/IVEC.2003.1286114","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286114","url":null,"abstract":"In this paper, we study about the effects of adsorbates on the field emission current and light emission form field emitting nanotubes at high emission current. The multiwall carbon nanotube films are grown on 5/spl times/5 mm/sup 2/ Ta (100 nm) coated silicon wafers through thermal CVD process. Field emission measurements were carried out using a planar diode configuration with a copper plate as the cathode base and ITO coated glass as the anode. The increase in field emission current is due to enhanced tunneling probability due to the presence of adsorbates.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122172520","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}
引用次数: 0
Pseudoperiodic wave-guides as slow-wave systems for broadband powerful TWTs 宽带强行波管慢波系统中的伪周期波导
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286153
V. A. Solntsev
{"title":"Pseudoperiodic wave-guides as slow-wave systems for broadband powerful TWTs","authors":"V. A. Solntsev","doi":"10.1109/IVEC.2003.1286153","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286153","url":null,"abstract":"A theory of wave selection in pseudoperiodical slow wave systems has been suggested for fixed frequency. The relationships for calculation of spatial harmonic amplitudes in a pseudoperiodic waveguide depending on the frequency and phase velocity were presented.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130358602","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}
引用次数: 0
Klystron output cavity investigation using MAFIA 用MAFIA研究速调管输出腔体
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286091
Jinjun Feng, R. Carter
{"title":"Klystron output cavity investigation using MAFIA","authors":"Jinjun Feng, R. Carter","doi":"10.1109/IVEC.2003.1286091","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286091","url":null,"abstract":"In this presentation we study how cavity and bunch parameters affect the efficiency of power transfer from the bunches to the cavity and also provide verifying data for other models. The parameters of the klystron used in the investigation were beam power 2MW, beam voltage 100KV and beam current 20A giving a saturated efficiency around 65%.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116441757","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}
引用次数: 2
TED high power pulsed klystrons for the spallation neutron source 用于散裂中子源的高功率脉冲速调管
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286295
A. Beunas, R. Marchesin, F. Peauger, D. Rees, P. Tallerico
{"title":"TED high power pulsed klystrons for the spallation neutron source","authors":"A. Beunas, R. Marchesin, F. Peauger, D. Rees, P. Tallerico","doi":"10.1109/IVEC.2003.1286295","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286295","url":null,"abstract":"This paper presents TED (Thales Electron Devices) high power pulsed klystrons for the spallation source. TEDs have engaged in the development of three different high power pulsed klystrons, as well as accessory RF windows for the SNS proton Linac. Klystrons are operating at 402.5 MHz and it is used on the Radio Frequency Quadripole and the Drift Tube Linac of SNS.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134165602","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}
引用次数: 4
CF/sub 4/ abatement by atmospheric pressure microwave plasma torch 常压微波等离子体炬处理CF/sub / 4
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286243
Y. Hong, H.S. Uhm
{"title":"CF/sub 4/ abatement by atmospheric pressure microwave plasma torch","authors":"Y. Hong, H.S. Uhm","doi":"10.1109/IVEC.2003.1286243","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286243","url":null,"abstract":"This article deals with CF/sub 4/ abatement by electrodeless atmospheric pressure microwave plasma torch. The plasma abatement device is attached to the vacuum pump, which discharges the nitrogen gas with contaminants. The abatement was carried out using oxygen and air as an additive gases. The destruction and removal efficiency (DRE) of more than 98% was achieved for tetrafluoromethane(CF/sub 4/). The detailed characterization of CF/sub 4/ abatement using Fourier transform infrared (FT-IR) and quadrupole mass spectrometer (QMS) showed the major PFC by-products.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132937669","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}
引用次数: 4
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