IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839)最新文献_第4页

Study of the two-stage gyroklystron amplifier 两级回旋速调管放大器的研究

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI: 10.1109/IVESC.2004.1414270

Z. Geng, Pu-kun Liu, X. Liang

引用次数: 0

Correlation of surface composition with emission property for scandate-type cathodes 鳞片型阴极表面成分与发射特性的相关性

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI: 10.1109/IVESC.2004.1414208

Ke Zhang, Ji Li, Kexin Pan

引用次数: 0

100 years anniversary of the oxide cathode - a historical review 氧化物阴极诞生100周年——历史回顾

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI: 10.1109/IVESC.2004.1413943

G. Gaertner, D. den Engelsen

{"title":"100 years anniversary of the oxide cathode - a historical review","authors":"G. Gaertner, D. den Engelsen","doi":"10.1109/IVESC.2004.1413943","DOIUrl":"https://doi.org/10.1109/IVESC.2004.1413943","url":null,"abstract":"Now 100 years have passed, since Arthur Wehnelt published his famous paper entitled: \"On the emission of negative ions from glowing metal compounds and related-phenomena\". This paper was the start of the oxide cathode, which has become the work horse not only in cathode ray tubes with a production of about 700 million oxide cathodes in 2000, but also in low pressure gas discharge lamps with about 7 billion pieces produced in the same year. A more systematic and detailed investigation of the physical processes in the oxide cathode began about 1920. The studies of Koller and Becker proved, that the emission of the cathode is due to an excess of metallic Ba in the oxide, which is produced during cathode activation. This excess Ba was thought to be present in the form of a monoatomic Ba film, which also exhibits a much lower Ba evaporation rate than bulk Ba. Reimann 1930 and others in the next years found, that there is a close relationship between the electrical conductivity of the coating and the emission. Regarding the theoretical model and basic investigations, new insights have been obtained and some of these was presented at this conference. Thus the oxide cathode still remains a modern and challenging subject despite its 100 years history.","PeriodicalId":340787,"journal":{"name":"IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125304601","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 simulation of the discharge characteristics in five-electrode AC PDP 五电极交流PDP放电特性的数值模拟

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI: 10.1109/IVESC.2004.1414256

Feng He, Yongdong Li, Chunliang Liu, Jian Sun

引用次数: 0

Operating model for scandate cathode with scandia doped tungsten bodies 掺杂钪钨体钪阴极的工作模型

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI: 10.1109/IVESC.2004.1413959

W. Liu, Ke Zhang, Yiman Wang, Kexin Pan, X. Gu, Jingshu Wang, Ji Li, Meiling Zhou

引用次数: 5

Microstructure and mechanism of emission of W-Ba dispenser cathodes 钨钡分配器阴极的微观结构及发射机理

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI: 10.1109/IVESC.2004.1414190

O. Getman, A. E. Lushkin, V. V. Panichkina, S. R. Rakitin

引用次数: 1

Electron gun simulation using MAFIA 利用MAFIA进行电子枪仿真

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI: 10.1109/IVESC.2004.1414286

Wang Shuzhong, Ding Yaogen

引用次数: 0

Non-aligned arrays of zinc oxide nanowires: fabrication and field emission properties 非对准氧化锌纳米线阵列:制备及场发射特性

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI: 10.1109/IVESC.2004.1414157

Gengmin Zhang, Liang Chen, Qifeng Zhang

引用次数: 0

The beneficial effects of phase velocity jumping technology in broad band CCTWT 相速度跳变技术在宽带CCTWT中的有益效果

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI: 10.1109/IVESC.2004.1414259

Z. Zi, Lili Fan, Guangqing Zhang

{"title":"The beneficial effects of phase velocity jumping technology in broad band CCTWT","authors":"Z. Zi, Lili Fan, Guangqing Zhang","doi":"10.1109/IVESC.2004.1414259","DOIUrl":"https://doi.org/10.1109/IVESC.2004.1414259","url":null,"abstract":"In coupling cavity travelling-wave tube (CCTWT), the gain and efficiency band-widths are not coincident, that is, at the high-frequency there is lower gain and at the low-frequency the efficiency is lower. This restricts the useful range of operating frequencies. Phase velocity jumping technology has been developed as a way to improve the efficiency of CCTWT at first. In this article, we discuss improving bandwidth characteristic of CCTWT by using phase velocity jumping technology, and the conclusion based on Pierce wave theory gives that the gain bandwidth and efficiency bandwidth could be balanced at the high-frequency and low-frequency by choosing a special phase velocity of natural circuit wave for output section, this velocity is lower than the phase velocity of natural circuit wave in input section and mid section. Thus electron beam velocity is synchronized with velocity of natural circuit wave at high-frequency in input section and mid section, but in output section, it is synchronized at low-frequency. In this article, we also discuss the advantages brought to periodic permanent magnet focus system when apply phase velocity jumping. Otherwise, the application of phase velocity jumping can also reduce 2/spl pi/ mode oscillation.","PeriodicalId":340787,"journal":{"name":"IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115125780","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

Electron emission properties of free-standing thin film 独立薄膜的电子发射特性

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI: 10.1109/IVESC.2004.1414236

Ma Huizhong, Z. Lan, Z. Junjie, Du Yunhai, Yao Ning, Zhang Binglin

{"title":"Electron emission properties of free-standing thin film","authors":"Ma Huizhong, Z. Lan, Z. Junjie, Du Yunhai, Yao Ning, Zhang Binglin","doi":"10.1109/IVESC.2004.1414236","DOIUrl":"https://doi.org/10.1109/IVESC.2004.1414236","url":null,"abstract":"Summary form only given. A free-standing thin film was prepared by electrophoretic method. A polyimide film coated with Ti was used as a cathode and a stainless steel plate as an anode, respectively. The two electrodes were placed into a bath with solvent consisting of fine carbon nano-tube particles, Mg(NO/sub 3/)/sub 2/ 6H/sub 2/O and isopropyl alcohol (IPA). Mixed solution was stirred for about 2-4 hours to assure the complete dissolution of Mg(NO/sub 3/)/sub 2/ 6H/sub 2/O and the dispersion of carbon nano-tube particles. DC electric field was applied to the two electrodes. The anode voltage was about 100V. After 1-2 minutes, the carbon nano-tube particles were deposited on the polyimide film coated with Ti, and a free-standing film was prepared. The electron field emission properties of the prepared thin film were tested by a diode mechanism. The turn-on field of the thin film was about 2.96V//spl mu/m. The current density of the thin film was about 200/spl mu/A/cm/sup 2/ at an electric field of 5.9V//spl mu/m. The morphology and structure of the thin film were examined by scanning electron microscope (SEM) and Raman spectroscopy. The experimental results indicate that this film \"could be a promising material applicable to cold cathodes.","PeriodicalId":340787,"journal":{"name":"IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128537681","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