Development of Smith Purcell FEL at fundamental wavelength for a compact THz light source

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K13412
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Quantum beam science
• Research Institution: Tohoku University (2016-2017); Japan Atomic Energy Agency (2015)
• Principal Investigator: Nishimori Nobuyuki 東北大学, 多元物質科学研究所, 准教授 (60354908)
• Co-Investigator(Renkei-kenkyūsha): NAGAI Ryoji 国立研究開発法人量子科学技術研究開発機構, 高崎量子応用研究所・東海量子ビーム応用研究センター, 上席研究員 (40354906) ; HAJIMA Ryoichi 国立研究開発法人量子科学技術研究開発機構, 高崎量子応用研究所・東海量子ビーム応用研究センター, 上席研究員 (30218432)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 自由電子レーザー / スミスパーセル放射 / 光陰極直流電子銃

Outline of Final Research Achievements

This work aims at demonstrating a Smith-Purcell free electron laser (FEL) at evanescent wavelength for a high power compact radiation source at THz wavelength. The compact THz source consists of an electron gun and a grating for Smith Purcell radiation. We successfully delivered 4.3 mA beam at 150 kV which will satisfy electron beam performance necessary for FEL amplification and prepared a vacuum chamber consisting of a grating on a linear motion and a THz diode detector with a focusing horn and a mesh filter with 10% band width. We however encountered a vacuum trouble where the gun system was exposed to 1 Pa air. We could not recover every system within limited time schedule. We will continue our Smith-Purcell FEL experiment.

Free Research Field

数物系科学