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Experimental Research on Smith-Parcel Free Electron Laser in Millimeter Wave Region

毫米波区史密斯包裹自由电子激光器实验研究

基本信息

批准号：
07680517
负责人：
SAITO Hirobumi
金额：
$ 1.28万
依托单位：
Institute of Space and Astronautical Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07680517/
关键词：
free electron laser Smith-Purcell effect relativistic electron beam metal grating coherent radiation millimeter wave submillimeter wave oscillator コヒーレント放射ミリ波静電加速器

项目摘要

The purpose of this research in 1995-1996 is the experimental research on Smith Purcel free electron laser in millimeter wave region.We operated a compact electrostatic accelerator (Disktron) with 1MV voltage. The electron source is photoelectron emission with KrF ultraviolet laser. This conbination of the electron source as well as the accelerator is suitable for precise control of the elctron beam. We successfully obtained the electron beam with 1-4 A peak current, 800KeV energy, and 30ns pulse width. This beam is propageted in the beam line, which is evacuated by a turbmolecular pump and a cryopump. The beam is well controlled by focusing magnets as well as deflection magnets.The theoretical analysis is performed, taking into account the dispersion relation of the electron beam mode and the electromagnetic waves near a metal grating. We design the Smith Purcel free electron laser with theoretical oscillation frequency of 51GHz. The grating pitch is 25mm and the length is 300mm.With aid of the focusing magnetic coils and deflection coils, the electron is carefully controlled to propagate near the grating surface. We observed the radiation from the interaction region with the U band (45-60GHz) detector diode. The power received by the diode is nearly 0dBm.We will continue the experiment. However, we think that what we observe is the 51GHz Smith-Purcel free electron laser oscillation, which is predicted by the theory.

本研究于1995-1996年进行了Smith-Purcel毫米波自由电子激光器的实验研究，工作在1 MV小型静电加速器上。电子源为KrF紫外激光光电子发射。电子源和加速器的这种组合适合于电子束的精确控制。我们成功地获得了峰值电流为1- 4A、能量为800 KeV、脉宽为30 ns的电子束。该束流在束线中传输，束线由涡轮分子泵和低温泵抽真空。在考虑电子束模色散关系和金属栅附近电磁波色散关系的基础上，对电子束的控制进行了理论分析。设计了理论振荡频率为51 GHz的Smith Purcel自由电子激光器。光栅间距为25 mm，长度为300 mm，通过聚焦线圈和偏转线圈的辅助，电子被精确地控制在光栅表面附近传播。我们用U波段（45- 60 GHz）探测二极管观测了相互作用区的辐射。二极管接收到的功率接近0 dBm。然而，我们认为，我们所观察到的是51 GHz的Smith-Purcel自由电子激光振荡，这是由理论预测的。