Search for spin polarization of a relativistic electron beam for improving the beam lifetime in storage ring

• Project/Area Number: 26400305
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: SAGA Light Source, Kyushu Synchrotron Light Research Center
• Principal Investigator: Kaneyasu Tatsuo 公益財団法人佐賀県地域産業支援センター九州シンクロトロン光研究センター, 加速器グループ, 副主任研究員 (90413997)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: 電子蓄積リング / 放射偏極 / ビーム寿命 / レーザーコンプトン散乱 / スピン偏極

Outline of Final Research Achievements

We have studied the radiative spin polarization of the 1.4 GeV electron beam and its effect to the beam lifetime in the SAGA Light Source storage ring. As a first step of the experimental investigation, we verified resonant spin depolarization of the stored beam. Sudden changes of the beam lifetime and beam loss rates due to the depolarization were observed. Furthermore we have developed a Compton-scattering polarimeter for studying the variation of beam lifetime due to the spin polarization of the electron beam.

Research Products

• [Presentation] SAGA-LSリングにおけるスピン消極共鳴の観測 (2016)
  • Author(s): 金安達夫，高林雄一，岩崎能尊, 江田茂
  • Organizer: 第10回九州シンクロトロン光研究センター研究成果報告会
  • Place of Presentation: サンメッセ鳥栖
  • Year and Date: 2016-08-03
• [Presentation] SAGA-LS蓄積リングにおけるスピン消極共鳴の観測 (2014)
  • Author(s): 金安達夫，高林雄一，岩崎能尊，江田茂
  • 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
  • Year and Date: 2014-08-10