Direct observation of the longitudinal phase space distribution of electron beam for investigation of micro-bunching instability

• Project/Area Number: 24651096
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Quantum beam science
• Research Institution: Tohoku University
• Principal Investigator: HAMA Hiroyuki 東北大学, 電子光理学研究センター, 教授 (70198795)
• Co-Investigator(Kenkyū-buntansha): HARA Toru 独立行政法人理化学研究所, 先端ビームチーム, チームリーダー (00280727) ; TOGAWA Kazuaki 独立行政法人理化学研究所, 先端ビームチーム, 先任研究員 (00342816)
• 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: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 低エネルギー電子ビーム / 縦方向位相空間 / チェレンコフ光 / 縦方向位相空間分布 / マイクロバンチング不安定性 / 非線形反射鏡 / 4f収束システム / 高輝度入射器

Outline of Final Research Achievements

Based on momentum dependence of Cherenkov opening angle, we have proposed a novel diagnostic system for direct observation of longitudinal phase space distribution of low energy electron beam. A specially designed "Turtle-back Mirror" confines the Cherenkov light onto a focal line, and the longitudinal phase space can be obtained by taking a temporal information together. We have examined the system resolution by numerical ray-trace simulation for whole optical system, and a momentum resolution of 1.15 keV/c and a temporal resolution of 0.74 ps were found out for the complete optics. Meanwhile a test piece of Turtle-Back Mirror was manufactured, and we investigated the performance of it. Although the overall shape of the non-linear surface satisfied the requirement, the surface roughness was really unsatisfactory for better resolutions. Further improvement of the mirror surface is required.

Research Products

• [Journal Article] Linear Focal Cherenkov-Ring Camera for Single Shot Observation of Longitudinal Phase Space Distribution for Non-Relativistic Electron Beam (2014)
  • Author(s): Ken-ichi Nanbu, Hiroyuki Hama, Fujio Hinode, Shigeru Kashiwagi, Anusorn Lueangaramwong, Toshiya Muto, Ikurou Nagasawa, Satoru Nagasawa, Yoshinobu Shibasaki, Ken Takahashi, Chihiro Tokoku
  • Journal Title: Proc. International Beam Instrumentation Conference Volume: 1
  • Open Access / Acknowledgement Compliant
• [Presentation] 縦方向位相空間測定のためのLFCカメラの開発 (2015)
  • Author(s): 日出富士雄
  • Organizer: 日本物理学会年会
  • Place of Presentation: 東京都新宿区早稲田大学
  • Year and Date: 2015-03-22
• [Presentation] Linear Focal Cherenkov-ring Camera for Direct Observation of Longitudinal Phase Space of Non-relativistic Electron Beam (2014)
  • Author(s): Anusorn Lueangaramwong
  • Organizer: 日本加速器学会年会
  • Place of Presentation: 青森市リンクステーションホール青森
  • Year and Date: 2014-08-09
• [Presentation] Optical test of silica aerogel radiator for LFC camera (2014)
  • Author(s): 南部健一
  • Organizer: 日本加速器学会年会
  • Place of Presentation: 青森市リンクステーションホール青森
  • Year and Date: 2014-08-09
• [Presentation] STUDY OF LONGITUDINAL PHASE SPACE DISTRIBUTION MEASUREMENT VIA A LINEAR FOCAL CHERENKOV RING CAMERA
  • Author(s): Anusorn Lueangaramwong
  • Organizer: ビーム物理研究会2013
  • Place of Presentation: 沖縄科学技術大学院大学
• [Presentation] Study of Longitudinal Phase Space Distribution Measurement via a Linear Focal Cherenkov Ring Camera
  • Author(s): Anusorn Lueangaramwong
  • Organizer: 日本加速器学会年会
  • Place of Presentation: 名古屋大学