An Intense terahertz radiation source at the Compact ERL

大強度テラヘルツ光源としてのコンパクトERL

原田 健太郎*; 島田 美帆*; 羽島 良一

Harada, Kentaro*; Shimada, Miho*; Hajima, Ryoichi

原子力機構,高エネルギー加速器研究機構,東京大学が共同で建設を進めているコンパクトERLでは、フェムト秒の電子パルスを大電流で加速できる。このフェムト秒電子パルスから発生されるコヒーレント放射光は、テラヘルツの波長領域で極めて高い強度を有する。コンパクトERLの電子ビームパラメータに基づいて、テラヘルツ光源の特性を評価する。

The Compact ERL is an energy recovery LINAC (ERL) test facility that is planned for KEK. The circumference of the recirculation path will be 70 m. Initially, the beam energy will be about 65 MeV and the current about 10 mA. Although the primary purpose of the machine is to aid the development of the key technologies that are essential for building an ultra-brilliant new synchrotron light source based on an ERL, the Compact ERL itself has great potential as an intense source of terahertz radiation. To generate the intense terahertz radiation, an electron bunch of a very short bunch length is required and bunch compression is inevitable. We discuss the parameters of the Compact ERL, present the results of a simulation of bunch compression, and make an estimate of the generated coherent synchrotron radiation.