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Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)最新文献

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Production status of 805-MHz, 550 kW pulsed klystrons for the Spallation Neutron Source 散裂中子源用805-MHz、550千瓦脉冲速调管的生产状况
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316350
S. Lenci, E. Eisen
{"title":"Production status of 805-MHz, 550 kW pulsed klystrons for the Spallation Neutron Source","authors":"S. Lenci, E. Eisen","doi":"10.1109/IVELEC.2004.1316350","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316350","url":null,"abstract":"The Spallation Neutron Source (SNS) is an accelerator-based neutron source. The SNS will provide the most intense pulsed neutron beams in the world for scientific research and industrial development. CRI is supporting the effort by providing 81 pulsed klystrons, model VKP-8291A, for the superconducting portion of the accelerator. The primary output power requirements are 550 kW peak, 49.5 kW average at 805 MHz, with an electron beam-to-rf conversion efficiency of 65%.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"8 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134005014","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
Development of a 1.5 MW gyrotron at 110 GHz 110 GHz 1.5 MW回旋管的研制
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316182
S. Chu, M. Blank, P. Borchard, S. Cauffman, K. Felch, H. Jory
{"title":"Development of a 1.5 MW gyrotron at 110 GHz","authors":"S. Chu, M. Blank, P. Borchard, S. Cauffman, K. Felch, H. Jory","doi":"10.1109/IVELEC.2004.1316182","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316182","url":null,"abstract":"High-power, long-pulse or CW millimeter-wave sources are required for electron cyclotron heating (ECH) and current drive in magnetic fusion experiments. Gyrotron oscillators have served as effective sources in this area for many years. Current experiments require unit power levels on the order of 1-2 MW. At CPI, we have successfully developed and delivered several high-power gyrotrons at 84 GHz, 140 GHz and 110 GHz. These gyrotrons deliver power levels in the range from 500 kW to 1 MW. To further reduce system cost and improve reliability we are currently developing and building a prototype 110 GHz, 1.5 MW gyrotron that extends the power-handling capabilities of the earlier 110 GHz, 1 MW design. The basic design of the 110 GHz, 1.5 MW gyrotron is similar to that of the earlier 110 GHz, 1 MW devices, but it utilizes a depressed-collector configuration.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133169852","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: 12
Emission spread in thermionic cathodes 热离子阴极中的辐射扩散
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316330
G. Miram, L. Ives, M. Read, R. Wilcox, M. Cattelino, B. Stockwell
{"title":"Emission spread in thermionic cathodes","authors":"G. Miram, L. Ives, M. Read, R. Wilcox, M. Cattelino, B. Stockwell","doi":"10.1109/IVELEC.2004.1316330","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316330","url":null,"abstract":"Summary form only given. Emission spread is the deviation of measured emission current from values calculated using the Richardson-Dushmann emission equation with a single best-fit effective work function value (TL curves). Examination of emission data taken from various currently-available thermionic cathodes leads to the conclusion that emission spread effects resulting from the cathode work function distribution (WFD) are significant throughout the entire TL emission region and cannot accurately be represented by a single-value or narrow WFD. Results of measured emission current spread for representative oxide-coated, and various types of dispenser cathodes are presented to illustrate these effects. It is particularly important to minimize emission spread for cathodes used in gyrotron applications. An example of determining gyrotron cathode quality and emission spread is also presented.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121798787","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: 9
Third harmonic frequency multiplication of a two-stage tapered gyro-TWT amplifier 两级锥形陀螺行波管放大器的三次谐波倍频
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316196
C. Baik, S. Jeon, D. Kim, G. Park, N. Sato, K. Yokoo
{"title":"Third harmonic frequency multiplication of a two-stage tapered gyro-TWT amplifier","authors":"C. Baik, S. Jeon, D. Kim, G. Park, N. Sato, K. Yokoo","doi":"10.1109/IVELEC.2004.1316196","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316196","url":null,"abstract":"The third harmonic frequency multiplication is experimentally verified using a two-stage tapered gyrotron traveling-wave tube amplifier in low-power operation. The third harmonic frequency multiplication is predicted and investigated using a self-consistent large-signal theory and a particle-in-cell code simulation. Both results show a good agreement in frequency multiplication and power amplification. The interaction between a 30 kV axis-encircling electron beam with a drive signal in the tapered waveguide of the input stage modulates the electron beam at the fundamental cyclotron harmonic, then the third harmonic component of the modulated beam current is chosen to be extracted in the tapered output stage. In the proof-of-principle experiment, X-band drive signals from 10.6 to 12 GHz are multiplied by three times to be Ka-band output frequencies from 31.8 to 36 GHz, showing consistent results with theoretical predictions when a 30 kV, 160 mA electron beam is used.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117344684","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
3D analysis of helical slow-wave structures for space TWTs: critical comparison of Ansoft HFSS and CST Microwave Studio 空间行波管螺旋慢波结构的三维分析:Ansoft HFSS和CST Microwave Studio的关键比较
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316357
M. Aloisio, P. Waller
{"title":"3D analysis of helical slow-wave structures for space TWTs: critical comparison of Ansoft HFSS and CST Microwave Studio","authors":"M. Aloisio, P. Waller","doi":"10.1109/IVELEC.2004.1316357","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316357","url":null,"abstract":"3D EM simulators allow to model any type of 3D structure without analytical approximations or experimental errors. The objective of this study is to evaluate the capabilities of two of these simulators (based on finite element and finite difference approaches) and to perform a critical comparison (in terms of CPU-time and accuracy) for a typical space helix TWT in Ku-band. Two commercially available simulators were used for this study: Ansoft-HFSS, and CST Microwave Studio.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115537641","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
Pressure field in the cathode-anode region of a high-power klystron amplifier 大功率速调管放大器阴极-阳极区的压力场
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316249
F. T. Degasperi, S. Verardi, C. Motta
{"title":"Pressure field in the cathode-anode region of a high-power klystron amplifier","authors":"F. T. Degasperi, S. Verardi, C. Motta","doi":"10.1109/IVELEC.2004.1316249","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316249","url":null,"abstract":"The pressure field in the region between the cathode and the anode of a high-power klystron amplifier is investigated in order to increase its life time. The study is conducted using a 1.3 GHz, 100 A and 240 kV high-power klystron with five reentrant coaxial cavities, assembled in a cylindrical drift tube 1.2 m long. This work takes into account the specific conductances and all important gas sources, as the degassing of the drift tube, the cavities walls, the cathode, the anode, and the collector.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115573592","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
Application of the MEBS SOURCE software package to high voltage electron gun design MEBS SOURCE软件包在高压电子枪设计中的应用
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316356
E. Munro, X. Zhu, J. Rouse
{"title":"Application of the MEBS SOURCE software package to high voltage electron gun design","authors":"E. Munro, X. Zhu, J. Rouse","doi":"10.1109/IVELEC.2004.1316356","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316356","url":null,"abstract":"We report on results of the high-voltage electron guns modeling with MEBS SOURCE software, where not only gun electron-optical properties, but high-voltage isolation have been analyzed and optimized successfully.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123422535","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
HFHPTA's efficiency analysis using PSpice non-linear vacuum tube model 利用PSpice非线性真空管模型分析HFHPTA的效率
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316226
S. Kostic, V. Milosevic
{"title":"HFHPTA's efficiency analysis using PSpice non-linear vacuum tube model","authors":"S. Kostic, V. Milosevic","doi":"10.1109/IVELEC.2004.1316226","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316226","url":null,"abstract":"An HF High-Power Tuned Amplifier (HFHPTA) is the output stage of a radio transmitter. Vacuum tubes (e.g. high power triode or tetrode) are used as active elements of the high-power amplifier classes 'B' and 'C' into the radio broadcasting transmitter. A standard goal in the balance of power analysis of an HFHPTA is to find optimal operating conditions (maximum output power with high efficiency) causing long service life for active elements. The principle of the injection of one or two harmonic signals into the drive and/or output carrier signal was used in order to improve power balance. The balance of power analysis of HFHPTA with composite drive and output signal obtained by the injection of two harmonics (N and P) into the basic carrier signal (M=1) is presented in this paper. The paper will compare the results of balance of power analysis between two types of HFHPTA with Siemens high power tetrodes using new PSpice method.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125142221","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 Ka/Q-band 100 W peak power MMPM Ka/ q波段100w峰值功率MMPM的研制
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316213
K. Tsutaki, R. Seura, E. Fujiwara, K. Tomikawa
{"title":"Development of Ka/Q-band 100 W peak power MMPM","authors":"K. Tsutaki, R. Seura, E. Fujiwara, K. Tomikawa","doi":"10.1109/IVELEC.2004.1316213","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316213","url":null,"abstract":"We are currently developing a Ka/Q-band 100 W peak power MMPM which is suited to millimeter-wave FWA base stations or satellite terminals. The innovative power-saved MMPM has the feature of a peak RF output power of more than 100 W (100 W peak) with power consumption of approximately 100 W at an actual operating output power level of 10 W cw. The TWT is designed so as to reduce power consumption by adopting a four-stage-depressed collector and setting the collector voltages matched to the actual operating condition (output power of 10 W cw). In addition, we have researched several kinds of basic technology, for example, for RF loss reduction and secondary emission suppression.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121549781","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
Generation of chaotic radiation in a driven TWT amplifier with delayed feedback 延迟反馈驱动行波管放大器中混沌辐射的产生
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316211
C. Marchewka, P. Larsen, S. Bhattacharjee, J. Booske, N. Ryskin, V. Titov
{"title":"Generation of chaotic radiation in a driven TWT amplifier with delayed feedback","authors":"C. Marchewka, P. Larsen, S. Bhattacharjee, J. Booske, N. Ryskin, V. Titov","doi":"10.1109/IVELEC.2004.1316211","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316211","url":null,"abstract":"We have been investigating the use of traveling wave tube (TWT) amplifiers as sources of chaotic radiation. To generate chaos, the TWT amplifier is made to operate in a highly nonlinear regime by recirculating a fraction of the TWT output power back to the input in a delayed feedback configuration. The system can transition into a chaotic state by varying the feedback attenuation and phase. Additionally, a drive signal provides a constant external force to the system. Thus, the experimental system behaves like a forced nonlinear oscillator. The study illuminates the different transitions to chaos that result from the choice of feedback filter and other parameters such as the drive signal frequency or intensity and the setting of the phase shifter in the feedback circuit.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123937293","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
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