Development of a High-Intensity and High-Efficiency Coherent Light Source by a New Method

• Project/Area Number: 24651102
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Quantum beam science
• Research Institution: Osaka University
• Principal Investigator: ISOYAMA Goro 大阪大学, 産業科学研究所, 教授 (80125989)
• Co-Investigator(Kenkyū-buntansha): KATO Ryukou 大阪大学, 産業科学研究所, 准教授 (20273708) ; KAWASE Keigo 大阪大学, 産業科学研究所, 助授 (60455277) ; IRIZAWA Akinori 大阪大学, 産業科学研究所, 助授 (90362756)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2012: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 量子ビーム / 光源技術 / 加速器 / 高性能レーザー / 放射光 / コヒーレント放射 / 自由電子レーザー

Outline of Final Research Achievements

Free-electron laser coverts kinetic energy of a high energy electron beam to laser light though its conversion efficiency is not high. High intensity coherent radiation is generated in a wavelength region around the bunch length of an electron beam when it is bent in a magnetic field, but the bunch length is not shorter than 1 mm. This study aimed to develop a new method for generation of high-intensity monochromatic coherent light using free electron laser as a short electron bunch generator. The energy profile of the electron beam was measured for the free-electron laser in operation and it turned out the energy spread was larger than expected. Micro-bunches generated in the free-electron laser are considered to be smoothed out in a uniform magnetic field, so that it is necessary to adopt a special magnetic field to maintain the bunching.

Research Products

• [Journal Article] Grid pulser for an electron gun with a thermionic cathode for the high-power operation of a terahertz free-electron laser (2015)
  • Author(s): S. Suemine, K. Kawase, N. Sugimoto, S. Kashiwagi, K. Furukawa, R. Kato, A. Irizawa, M. Fujimoto, H. Ohsumi, M. Yaguchi, S. Funakoshi, R. Tsutsumi, K. Kubo, A. Tokuchi, G. Isoyama
  • Journal Title: Nucl. Instr. Meth. A Volume: 773 Pages: 97-103
  • DOI: 10.1016/j.nima.2014.10.071
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 産研 THz-FEL の現状 (2014)
  • Author(s): 川瀬啓悟、加藤龍好、入澤明典、藤本將輝、矢口雅貴、船越壮亮、堤亮太、磯山悟朗
  • Organizer: 第21回 FELとHigh-Power Radiation 研究会
  • Place of Presentation: 大阪大学産業科学研究所講堂（大阪府茨木市）
  • Year and Date: 2014-12-11 – 2014-12-12
• [Presentation] High Power Operation of the THz FEL at ISIR, Osaka University (2014)
  • Author(s): K. Kawase, M. Fujimoto, S. Funakoshi, K. Furukawa, A. Irizawa, G. Isoyama, R. Kato, K. Kubo, K. Miyazaki, S. Suemine, A. Tokuchi, R. Tsutsumi, M. Yaguchi
  • Organizer: 36th International Free Electron Laser Conference
  • Place of Presentation: バーゼル（スイス）
  • Year and Date: 2014-08-25 – 2014-08-29
• [Presentation] 高強度テラヘルツＦＥＬの時間形状と波長スペクトルの発展 (2014)
  • Author(s): 加藤龍好, 川瀬啓悟, 入澤明典, 藤本將輝, 矢口雅貴, 船越壮亮, 堤 亮太, 宮崎数磨, 磯山悟朗, 柏木 茂, 山本 樹
  • Organizer: 第11回日本加速器学会年会
  • Place of Presentation: リンクステーションホール青森（青森県青森市）
  • Year and Date: 2014-08-08 – 2014-08-12