Electron Beam Source of Nanotube for Free Electron laser

自由电子激光用纳米管电子束源

• 批准号: 12650057
• 负责人: TSUNAWAKI Yoshiaki
• 金额: $ 2.18万
• 依托单位: Osaka Sangyo University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650057/
• 关键词: carbon nanotube; multiwalled nanotube; field emission; field emitter; electron source; free electron laser; freeelectron laser

It is well known that an electron beam with low emittance and low energy spread is emitted from a tip of metal/semiconductor needle by field emission. These characters of the field emitter are favorable for a free electron laser (FEL). In this study carbon nano-tubes (CNTs) were synthesized by three methods of arc discharge, laser ablation and chemical vapor deposition (CVD). Some of them were investigated for the field emission experiment.A single multiwalled CNT on a W needle gave the current of 〜9 μA and a mass of entangled CNTs emitted electrons with current of 2.5 mA which is 〜100 times as high as that of usual W needle cathode. The SEM images of CNTs in pre-/post-experiment suggested that the entangled tubes were frayed by the high electric field and then electrons were emitted mainly from the tip of each CNT. Especially the entangles CNTs coated on a stainless tube with a very small amount of resin presented similar high current with a fluctuation of <4 %. However the current decreased to 〜600 to 40 μA when the electrodes with a hole at the center were set in order to extract the electron beam. It was attributed to the arrival of most of the elements to the first electrode. In the further studies, the geometrical optimum design of the electrodes will improve the current and the focusing property of the electron beam for FEL. Besides the field emission experiment, other remarkable results were obtained such as the first success of forming nano-products including CNT by ultraviolet laser of XeCl excimer and finding the superior transmission filter of polyethylene sheet including CNT in the far-infrared.

众所周知，低发射度和低能散的电子束是通过场发射从金属/半导体针尖发射出来的。场发射极的这些特性对自由电子激光器是有利的。本文采用电弧放电法、激光烧蚀法和化学气相沉积法(CVD)三种方法制备了碳纳米管。其中一些用于场发射实验，单个多壁碳纳米管在W针上的电流为~9μA，大量纠缠的碳纳米管发射电子，电流为2.5 mA，是普通W针阴极的~100倍。实验前后碳纳米管的扫描电子显微镜图像表明，缠绕的碳纳米管在高压电场作用下发生磨损，电子主要从每个碳纳米管的尖端发射出来。尤其是在不锈钢管上涂覆少量树脂的缠绕碳纳米管表现出类似的大电流，波动率为&lt；4%。而在中心开孔电极引出电子束时，电流降至~600~40μA。这是由于大多数元素到达了第一个电极。在进一步的研究中，电极的几何优化设计将改善自由电子激光电子束的电流和聚焦性能。除了场发射实验外，还取得了其他显著的成果，如首次成功地利用XeCl准分子的紫外激光制备了包括碳纳米管在内的纳米产品，并找到了含碳纳米管的聚乙烯薄膜在远红外波段的优良透射器。

项目成果

Y.Tsunawaki, M.Masuda, et al.: "Field Emission from a Mass of Entangled Carbon Nanotubes"Proc. of 23rd Int. FEL Conf. & 8th FEL Users Workshop. II47-II48 (2002)

Y.Tsunawaki、M.Masuda 等人：“大量缠结碳纳米管的场发射”Proc。

浅川誠, 綱脇惠章: "赤外線研究の過去・現在・未来-光源-"日本赤外線学会誌. 12. 6-11 (2002)

Makoto Asakawa、Keiaki Tsunawaki：“红外研究的过去、现在和未来 - 光源”日本红外学会杂志 12. 6-11 (2002)。

Y.Tsunawaki, M.Masaki, et al.: "Development of a Hybrid Helical Microwiggler with Four Poles per Period"IEEE J. Quantum Electron.. 39. 337-342 (2003)

Y.Tsunawaki、M.Masaki 等人：“Development of a Hybrid Helical Microwiggler with Four Poles per period”IEEE J. Quantum Electron.. 39. 337-342 (2003)

Y. Tsunawaki: "Free Electron Laser and its Applications in the Infrared"Soc. Res. of Light Appl./Vision, IEE Jpn.. LAV-01-15. 11-16 (2001)

Y. Tsunawaki：“自由电子激光及其在红外中的应用”Soc。

M. Asakawa and Y. Tsunawaki: "Sources in the Infrared"J. Jpn. Soc. Infrared Sci. Tech.. 12. 6-11 (2002)

M. Asakawa 和 Y. Tsunawaki：“红外线来源”J.