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527 GHz gyrotron for DNP-NMR spectroscopy 用于DNP-NMR光谱的527 GHz回旋管
IVESC 2012 Pub Date : 2012-04-24 DOI: 10.1109/IVESC.2012.6264178
S. Jawla, M. Shapiro, W. Guss, R. Temkin
{"title":"527 GHz gyrotron for DNP-NMR spectroscopy","authors":"S. Jawla, M. Shapiro, W. Guss, R. Temkin","doi":"10.1109/IVESC.2012.6264178","DOIUrl":"https://doi.org/10.1109/IVESC.2012.6264178","url":null,"abstract":"We describe the design of a 20W, continuous wave 527 GHz gyrotron for Dynamic Nuclear Polarization (DNP) enhanced solid state Nuclear Magnetic Resonance (NMR) spectroscopy on an 800 MHz spectrometer. A 9.8 T helium-free superconducting magnet with a warm bore diameter of 76mm is planned for the gyrotron operation. The gyrotron resonator cavity is designed to operate in the TE11,3,p mode at 527 GHz which is the second harmonic (ω=2ωc) of the electron cyclotron frequency. The design is based on a diode electron gun (Vk=15 kV, Ib=190 mA) and lateral output with an internal Vlasov-type mode converter. Frequency tunability of Δf/f ≈ 0.25% is being studied around the nominal frequency of 527 GHz, with a goal of constant output power of more than 20W.","PeriodicalId":249267,"journal":{"name":"IVESC 2012","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132013908","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
Ultra wide band UHF chaotic impulse generator 超宽带超高频混沌脉冲发生器
IVESC 2012 Pub Date : 2012-04-24 DOI: 10.1109/IVESC.2012.6264162
B. Dmitriev, J. D. Zharkov, V. N. Skorokhodov, S. A. Sadovnikov
{"title":"Ultra wide band UHF chaotic impulse generator","authors":"B. Dmitriev, J. D. Zharkov, V. N. Skorokhodov, S. A. Sadovnikov","doi":"10.1109/IVESC.2012.6264162","DOIUrl":"https://doi.org/10.1109/IVESC.2012.6264162","url":null,"abstract":"This work presents basic characteristics of UHF chaotic ultra wideband generator, based on TWT. It is shown that in such generator chaotic radio-impulses with 3 GHz continuous wideband and 22.5 W peak power may be produced.","PeriodicalId":249267,"journal":{"name":"IVESC 2012","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114548884","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
Scandia doped impregnated cathode prepared with hollow tungsten spheres 用空心钨球制备掺钪浸渍阴极
IVESC 2012 Pub Date : 2012-04-24 DOI: 10.1109/IVESC.2012.6264159
Jinshu Wang, Yuntao Cui, W. Liu, Xi Wang, Yiman Wang, Meiling Zhou
{"title":"Scandia doped impregnated cathode prepared with hollow tungsten spheres","authors":"Jinshu Wang, Yuntao Cui, W. Liu, Xi Wang, Yiman Wang, Meiling Zhou","doi":"10.1109/IVESC.2012.6264159","DOIUrl":"https://doi.org/10.1109/IVESC.2012.6264159","url":null,"abstract":"The scandia doped tungsten powders have been obtained by a new method of spray drying combined with two-step reduction in hydrogen atmosphere. Based on the powders, the cathode impregnated with 612 aluminates (SDI-612) has excellent emission capability of 72.2A/cm<sup>2</sup> at 900<sup>o</sup>C<sub>b</sub>, moreover, the SDI-612 cathode has a lower evaporation rate of 8.45*10<sup>-9</sup>g.cm<sup>-2</sup>s<sup>-1</sup> at 1150<sup>o</sup>C<sub>b</sub>.","PeriodicalId":249267,"journal":{"name":"IVESC 2012","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123336466","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
First-principles study of interaction of lithium atoms with H-adsorbed (3, 3) single-walled carbon nanotube 锂原子与h吸附(3,3)单壁碳纳米管相互作用的第一性原理研究
IVESC 2012 Pub Date : 2012-04-24 DOI: 10.1109/IVESC.2012.6264194
Zhi-Jun Jia, Shunfu Xu, G. Yuan, Lin-Peng Li
{"title":"First-principles study of interaction of lithium atoms with H-adsorbed (3, 3) single-walled carbon nanotube","authors":"Zhi-Jun Jia, Shunfu Xu, G. Yuan, Lin-Peng Li","doi":"10.1109/IVESC.2012.6264194","DOIUrl":"https://doi.org/10.1109/IVESC.2012.6264194","url":null,"abstract":"In this paper, we have employed density functional theory to investigate the adsorption mechanisms of one lithium atom on sidewalls of H-adsorbed (3, 3) single-walled carbon nanotubes (SWCNTs) which have vacancy defects. An understanding of influence of hydrogen adsorption and vacancy defects on lithium adsorption is obtained.","PeriodicalId":249267,"journal":{"name":"IVESC 2012","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128032689","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
Ab initio model of intrinsic defects in Sc2O3 for thermionic cathode systems 热离子阴极体系中Sc2O3本征缺陷的从头算模型
IVESC 2012 Pub Date : 2012-04-24 DOI: 10.1109/IVESC.2012.6264181
R. Jacobs, D. Morgan, J. Booske
{"title":"Ab initio model of intrinsic defects in Sc2O3 for thermionic cathode systems","authors":"R. Jacobs, D. Morgan, J. Booske","doi":"10.1109/IVESC.2012.6264181","DOIUrl":"https://doi.org/10.1109/IVESC.2012.6264181","url":null,"abstract":"A defect model for Sc<sub>2</sub>O<sub>3</sub> was developed using quantum mechanical modeling and evaluated under cathode operating conditions to determine the electronic properties of Sc<sub>2</sub>O<sub>3</sub> used in cathode experiments. We find that Sc<sub>2</sub>O<sub>3</sub> can conduct well enough with a sub-ppm impurity concentration such that the limiting step of emission is not conduction through bulk Sc<sub>2</sub>O<sub>3</sub>.","PeriodicalId":249267,"journal":{"name":"IVESC 2012","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122819925","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
Field emission from mechanical pencil lead and graphite edges 机械铅笔芯和石墨边缘的场发射
IVESC 2012 Pub Date : 2012-04-24 DOI: 10.1109/IVESC.2012.6264185
T. Endo, T. Higuchi, Y. Yamada, M. Sasaki
{"title":"Field emission from mechanical pencil lead and graphite edges","authors":"T. Endo, T. Higuchi, Y. Yamada, M. Sasaki","doi":"10.1109/IVESC.2012.6264185","DOIUrl":"https://doi.org/10.1109/IVESC.2012.6264185","url":null,"abstract":"To clarify the origin of the superior FE characteristics observed from mechanical pencil lead, we have examined the FE features and the ambient gas effects on FE as well as FIM/FEM images of the edge of graphite flakes, consisting of vertically aligned graphene edges.","PeriodicalId":249267,"journal":{"name":"IVESC 2012","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133072958","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
Brightness and energy spread measurements for an I-cathode i阴极的亮度和能量扩散测量
IVESC 2012 Pub Date : 2012-04-24 DOI: 10.1109/IVESC.2012.6264197
L. van Kouwen, M. van der Heijden, P. Kruit
{"title":"Brightness and energy spread measurements for an I-cathode","authors":"L. van Kouwen, M. van der Heijden, P. Kruit","doi":"10.1109/IVESC.2012.6264197","DOIUrl":"https://doi.org/10.1109/IVESC.2012.6264197","url":null,"abstract":"For possible use in a miniature scanning electron microscope, the brightness and energy spread of an impregnated cathode in triode configuration were measured. For a normalized brightness of 2.104 A/sr.m2.V we measured an energy spread of 0.8 e V.","PeriodicalId":249267,"journal":{"name":"IVESC 2012","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122700746","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
Investigation of lift-off layer in Spindt cathode fabrication Spindt阴极制备中剥离层的研究
IVESC 2012 Pub Date : 2012-04-24 DOI: 10.1109/IVESC.2012.6264184
Xinghui Li, Guodong Bai, Hanyan Li, M. Ding, Jinjun Feng, Fujiang Liao
{"title":"Investigation of lift-off layer in Spindt cathode fabrication","authors":"Xinghui Li, Guodong Bai, Hanyan Li, M. Ding, Jinjun Feng, Fujiang Liao","doi":"10.1109/IVESC.2012.6264184","DOIUrl":"https://doi.org/10.1109/IVESC.2012.6264184","url":null,"abstract":"Some lift-off materials for Spindt cathode fabricating were investigated. Water-soluble materials such as sodium chloride and sodium carbonate make a very fast removing process but cause rough and irregular emitters. An etching technique for heated aluminum oxide lift-off film was suggested to obtain good cone emitters and easy etching process.","PeriodicalId":249267,"journal":{"name":"IVESC 2012","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127810874","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
Investigation of influence of surface activator element on scandate cathodes work function 表面活化元件对阴极做功性能影响的研究
IVESC 2012 Pub Date : 2012-04-24 DOI: 10.1109/IVESC.2012.6264177
Xizhu Zhang, Jinshu Wang, Yiman Wang, W. Liu, Meiling Zhou
{"title":"Investigation of influence of surface activator element on scandate cathodes work function","authors":"Xizhu Zhang, Jinshu Wang, Yiman Wang, W. Liu, Meiling Zhou","doi":"10.1109/IVESC.2012.6264177","DOIUrl":"https://doi.org/10.1109/IVESC.2012.6264177","url":null,"abstract":"The surface analysis of scandate cathodes has revealed that active substances of Ba, Sc and O formed a layer on the surface of the cathodes. By using First-principles calculation method, the W and Ba-Sc-O-W systems were calculated to study the effect of active elements on the work function of the cathode.","PeriodicalId":249267,"journal":{"name":"IVESC 2012","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129014609","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
Simulation of thermionic dispenser cathodes 热离子分配器阴极的模拟
IVESC 2012 Pub Date : 2012-04-24 DOI: 10.1109/IVESC.2012.6264189
M. Ravi, K. S. Bhat
{"title":"Simulation of thermionic dispenser cathodes","authors":"M. Ravi, K. S. Bhat","doi":"10.1109/IVESC.2012.6264189","DOIUrl":"https://doi.org/10.1109/IVESC.2012.6264189","url":null,"abstract":"Work function of a dispenser cathode will have a distribution. In this paper, work function distribution is introduced in the diode simulation. In the CST particle studio model, the dispenser cathode surface was divided into several areas. Effect of work function distribution on emission characteristics is discussed.","PeriodicalId":249267,"journal":{"name":"IVESC 2012","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117075283","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
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