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Development of Small-sized Cherenkov FEL in the Far-Infrared by Using a Small Electron Beam Cathode

利用小型电子束阴极开发远红外小型切伦科夫自由电子激光器

基本信息

批准号：
15360195
负责人：
TSUNAWAKI Yoshiaki
金额：
$ 8.64万
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 (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360195/
关键词：
free electron laser Cherenkov electron beam micro-emitter carbon nanotube far-infrared tera-hertz radiation far-infared electrom beam

项目摘要

The concern of many researchers on free electron laser (FEL) is toward large-sized FELs in the shorter wavelength such as X ray. However some of them are also interested in the THz frequency region because of the recent boom of THz technology. In order to generalize and apply FEL in the THz or far-infrared region, it is very important to develop a tabletop type FEL. Even an FEL with a micro-wiggler is not unfortunately so small that it can be installed in a usual laboratory of university. Therefore other type FEL must be considered and then we have been developing a small-sized Cherenkov FEL (C-FEL) by using a field emission electron beam source.In order to construct the C-FEL, we have developed/studied (1) a micro e-beam source, (2) e-beam focusing and propagation system, and (3) waveguide resonator and the estimation method of its optical constant. We also researched on the theory for C-FEL and its simulation computational code, and formation of single walled carbon nanotubes (SW-CNT … More s) as a candidate for new e-beam source.The simulation for small signal gain of C-FEL showed 〜10 % at the frequency of 46.4 GHz under the condition of the e-beam (50 keV and 1 mA) propagating between two Si plates with thickness of 0.65 mm. It also saturated after 〜300 round trips of the radiation inside the Si resonator. The e-beam in the magnetic flux density of 5 T would propagate with the diameter of 〜12μm. Referring to these results etc., the C-FEL has been designed/constructed in a superconducting magnet of 5 T. It is so small that the height and area are 2 m and 0.7x0.7 m^2, respectively. We would succeed in the C-FEL oscillation using a Spindt cathode in the near future. We also have been constructing another C-FEL which dose not use a superconducting magnet but electric field lens for e-beam.SW-CNTs were produced by an ablation method using an excimer laser. The purity of them was higher than those by other methods. It was observed that the diameter of SW-CNT became smaller with the wavelength of the excimer laser. Although the produced SW-CNTs were used as a field emission cathode, they did not give, at present time, a stable e-beam current. Less

The concern of many researchers on free electron laser (FEL) is toward large-sized FELs in the shorter wavelength such as X ray. However some of them are also interested in the THz frequency region because of the recent boom of THz technology. In order to generalize and apply FEL in the THz or far-infrared region, it is very important to develop a tabletop type FEL. Even an FEL with a micro-wiggler is not unfortunately so small that it can be installed in a usual laboratory of university. Therefore other type FEL must be considered and then we have been developing a small-sized Cherenkov FEL (C-FEL) by using a field emission electron beam source.In order to construct the C-FEL, we have developed/studied (1) a micro e-beam source, (2) e-beam focusing and propagation system, and (3) waveguide resonator and the estimation method of its optical constant.我们还研究了 C-FEL 的理论及其仿真计算代码，以及作为新型电子束源候选材料的单壁碳纳米管（SW-CNT … More s）的形成。在电子束（50 keV 和 1 mA）在厚度为 0.65 mm 的硅板之间传播的条件下，C-FEL 小信号增益的仿真显示，在 46.4 GHz 频率下，增益约为 10%。 It also saturated after 〜300 round trips of the radiation inside the Si resonator. The e-beam in the magnetic flux density of 5 T would propagate with the diameter of 〜12μm. Referring to these results etc., the C-FEL has been designed/constructed in a superconducting magnet of 5 T. It is so small that the height and area are 2 m and 0.7x0.7 m^2, respectively. We would succeed in the C-FEL oscillation using a Spindt cathode in the near future. We also have been constructing another C-FEL which dose not use a superconducting magnet but electric field lens for e-beam.SW-CNTs were produced by an ablation method using an excimer laser. The purity of them was higher than those by other methods. It was observed that the diameter of SW-CNT became smaller with the wavelength of the excimer laser. Although the produced SW-CNTs were used as a field emission cathode, they did not give, at present time, a stable e-beam current.较少的