Development of Permanent Magnet-based Field-variable Dipole Magnet for Next Generation Light Sources

• Project/Area Number: 26600150
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Quantum beam science
• Research Institution: Japan Synchrotron Radiation Research Institute
• Principal Investigator: Watanabe Takahiro 公益財団法人高輝度光科学研究センター, 加速器部門, 副主席研究員 (90282582)
• Co-Investigator(Kenkyū-buntansha): FUKAMI Kenji 公益財団法人 高輝度光科学研究センター, 加速器部門, 副主幹研究員 (60463311)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
• Keywords: 加速器 / 蓄積リング / 磁石 / 永久磁石 / 次世代光源 / 将来光源 / 回折限界光源 / 次世代放射光源 / 偏向磁石

Outline of Final Research Achievements

Permanent magnet based dipole magnets have been developed for next generation light sources. Permanent magnet is advantageous over conventional electromagnet in terms of power consumption and less power supply related failures. There are, however, reasons why such magnets have not been chosen as main magnets for light sources, such as field quality, temperature dependence of magnetic field, adjustability of magnetic field, and demagnetisation due to radiation. We had designed magnetic circuit for solving these issues, and the magnet was fabricated. As a result, it was experimentally verified that the newly designed dipole magnet work almost fully as expected , and so far nothing has prevented us from going for permanent magnets. In fact, a discussion on a feasibility of such magnets for the latest next generation light source project in Japan has seriously started, other positive comments have been given from outside. Further study will be continued.

Research Products

• [Presentation] Magnet Development for Spring-8 Upgrade (2016)
  • Author(s): Takahiro Watanabe
  • Organizer: 7th International Particle Accelerator Conference 2016 (IPAC2016)
  • Place of Presentation: Busan, Korea
  • Year and Date: 2016-05-08
  • Int'l Joint Research
• [Presentation] Spring-8-II Storage Ring Development (2016)
  • Author(s): Takahiro Watanabe
  • Organizer: 5th Diffraction Limited Storage Ring Workshop (DLSR2016)
  • Place of Presentation: Hamburg, Germany
  • Year and Date: 2016-03-09
  • Int'l Joint Research
• [Presentation] Permanent Dipole Magnet R&D for SPring-8-II (2015)
  • Author(s): T. Taniuchi, T. Aoki, K. Fukami, S. Takano and T. Watanabe
  • Organizer: 6th International Particle Accelerator Conference (IPAC15)
  • Place of Presentation: Richmond, VA, USA
  • Year and Date: 2015-05-03 – 2015-05-08
• [Presentation] Challenges in magnet design for SPring-8-II (2014)
  • Author(s): Takahiro Watanabe
  • Organizer: 4th Diffraction Limited Storage Ring (DLSR) Workshop (DLSR14)
  • Place of Presentation: Argonne, IL, USA
  • Year and Date: 2014-11-19 – 2014-11-21
• [Presentation] Magnetic-field variable permanent dipole magnet for future light sources (2014)
  • Author(s): Takahito Watanabe, Kenji Fukami, Tatsuro Nakanishi and Shigeki Sasaki
  • Organizer: 5th International Particle Accelerator Conference (IPAC14)
  • Place of Presentation: Dresden, Germany
  • Year and Date: 2014-06-15 – 2014-06-20