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This paper mainly investigates plasma characterization on carbon
fiber cathodes with and without cesium iodide (CsI) coating powered
by a ~300~ns, ~ 200~kV accelerating pulse. It was found
that the CsI layers can not only improve the diode voltage, but also
maintain a stable perveance. This indicates a slowly changed diode
gap or a low cathode plasma expansion velocity. By spectroscopic
diagnostics, in the vicinity of the cathode surface the average
plasma density and temperature were found to be ~ 3×
1014~cm-3 and ~ 5~eV, respectively, for an
electron current density of ~ 40~A/cm2. Furthermore, there
exists a multicomponent plasma expansion toward the anode. The
plasma expansion velocity, corresponding to the carbon and hydrogen
ions, is estimated to be ~ 1.5~cm/μ s. Most notably, Cs
spectroscopic line was obtained only at the distance ≤ 0.5~mm
from the cathode surface. Carbon and hydrogen ions are obtained up
to the distance of 2.5~mm from the cathode surface. Cs ions almost
remain at the vicinity of the cathode surface. These results show
that the addition of CsI enables a slow cathode plasma expansion
toward the anode, providing a positive prospect for developing
long-pulse electron beam sources. 相似文献
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电感储能加速器运行中电磁辐射的实验研究 总被引:1,自引:0,他引:1
发现了一个被普遍忽视的问题,在电感储能加速器运行中产生很强的电磁辐射.这种电磁辐射在一定距离范围内可以对测量仪器造成破坏.通过多次测量,发现此辐射主频在75MHz左右,频谱较宽,是一低频电磁波.以同轴电缆作为测量仪器的替代物,测量辐射场对同轴电缆的作用,罗氏线圈测得电流幅值达217mA.辐射可能是由回路LC振荡或者加速器中的电爆炸丝开关引起的.基于LC振荡和电爆炸丝的工作原理,分别讨论了辐射产生的物理过程.我们更倾向于认为辐射来源于开关导通引起的回路LC振荡.此外,辐射强度受电流的变化率影响,初级回路电流变化慢,次级回路变化快,这样产生了一弱一强的两个辐射信号.这些为进一步研究电感储能加速器运行中的电磁辐射及防护提供实验支持. 相似文献
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发现了一个被普遍忽视的问题, 在电感储能加速器运行中产生很强的电磁辐射. 这种电磁辐射在一定距离范围内可以对测量仪器造成破坏. 通过多次测量, 发现此辐射主频在75MHz左右, 频谱较宽, 是一低频电磁波. 以同轴电缆作为测量仪器的替代物, 测量辐射场对同轴电缆的作用, 罗氏线圈测得电流幅值达217mA. 辐射可能是由回路LC振荡或者加速器中的电爆炸丝开关引起的. 基于LC振荡和电爆炸丝的工作原理, 分别讨论了辐射产生的物理过程. 我们更倾向于认为辐射来源于开关导通引起的回路LC振荡. 此外, 辐射强度受电流的变化率影响, 初级回路电流变化慢, 次级回路变化快, 这样产生了一弱一强的两个辐射信号. 这些为进一步研究电感储能加速器运行中的电磁辐射及防护提供实验支持. 相似文献
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Time-and-space resolved measurements of the emission uniformity of carbon fibre cathode in high-current pulsed discharge 下载免费PDF全文
The remaining challenges, confronting high-power microwave
(HPM) sources and pulsed power generators, stimulate the
developments of robust relativistic electron beam sources. This
paper presents a carbon fibre cathode which is tested in a single
pulsed power generator. The distribution and the development of
cathode plasma are observed by time-and-space resolved diagnostics,
and the uniformity of electron beam density is checked by taking
x-ray images. A quasistationary behaviour of cathode plasma
expansion is observed. It is found that the uniformity of the
extracted electron beam is satisfactory in spite of individual
plasma jets on the cathode surface. These results show that carbon
fibre cathodes can provide a positive prospect for developing
a high-quality electron beam. 相似文献
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通过分析近年来广西制造业与物流业联动发展的现状,选取两业联动影响较显著的指标,运用灰色关联分析对广西制造业和物流业联动关系进行分析,根据建模结果得出广西两业联动发展尚不协调的结论,并就未来广西两业联动发展提出提升经济数量和质量、加快物流金融创新、加强专业化精细化物流外包发展、完善基础设施与集疏体系建设、提升与创新服务质量、加强政府引导扶持等对策建议,以期促进广西两业的联动发展. 相似文献
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