Development of Beam Position Monitor Using HOM Coupler

• Project/Area Number: 18560049
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Applied physics, general
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: SAWAMURA Masaru Japan Atomic Energy Agency, Quantum Beam Science Directorate, Assistant Principal Researcher (30354905)
• Co-Investigator(Kenkyū-buntansha): NAGAI Ryoji Japan Atomic Energy Agency, 量子ビーム応用研究部門, Assistant Principal Researcher (40354906) ; KIKUZAWA Nobuhiro Japan Atomic Energy Agency, 量子ビーム応用研究部門, Researcher (50354907) ; NISHIMORI Nobuyuki Japan Atomic Energy Agency, 量子ビーム応用研究部門, Assistant Principal Researcher (60354908) ; HAJIMA Ryouichi Japan Atomic Energy Agency, 量子ビーム応用研究部門, Group Leader (30218432)
• Project Period (FY): 2006 – 2007
• Project Status: Completed (Fiscal Year 2007)
• Budget Amount: ¥2,310,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥210,000); Fiscal Year 2007: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
• Keywords: Accelerator / HOM coupler / Beam Position Monitor

Research Abstract

Abeam position monitor was developed using HOM coupler attached to JAEA ERL-FEL, superconducting linac. A shifter magnet was designed and made to control the electron beam position. Analysis of electro-magnetic field with 3D code MAFIA was used to calculate the beam trajectory. The shifter magnet was installed at the upstream of the first main accelerator. HOM power was measured by changing the shifter magnet current The HOM power was found to be represented by the sum of the square of beam position (sum of the initial beam position and beam shift proportional to shifter magnet current) and the square of the beam position fluctuation. The measured HOM powers and shifter magnet currents were fitted with the analytic formula to estimate the beam position and beam position fluctuation. JAEA ERL-FEL was estimated to have the beam offset of 0.23 mm and -0.31mm and the beam position fluctuation of 0.21 mm and 0.60 mm in horizontal and vertical reprehensively. When the beam position fluctuates, HOM power is not zero even if the beam passes through the axis. Scanning the beam position enable to estimate the beam position and the beam position fluctuation precisely.

Research Products

• [Journal Article] MEASUREMENT OF BEAM POSITION MONITOR USING HOM COUPLERS OF SUPERCONDUCTING CAVITIES (2007)
  • Author(s): M. Sawamura
  • Journal Title: Proceedings of 2007 Pariticle Accelerator Conference (PAC07) Pages: 4060-4062
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] MEASUREMENT OF BEAM POSITION MONITOR USING HOM COUPLERS OF SUPERCONDUCTING CAVITIES (2007)
  • Author(s): Masaru Sawamura
  • Journal Title: Proceedings of 2007 Particle Accelerator Conference(PAC07) Pages: 406-4062
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] MEASUREMENT OF BEAM POSITION MONITRO USING HOM COUPLERS OF SUPERCONDUCTING CAVITIES (2007)
  • Author(s): M. Sawamura
  • Journal Title: Proceedings of 2007 Particle Accelerator Conference(PAC07) Pages: 4060-4062
• [Journal Article] IOT高周波出力特性 (2006)
  • Author(s): 沢村 勝
  • Journal Title: 第3回加速器学会年会・第31回リニアック技術研究会プロシーディングス Pages: 832-834
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Output Properties of IOT RF Sources (2006)
  • Author(s): Masaru Sawamura
  • Journal Title: Proceedings of the 3rd Annual Meeting of Particle Accelerator Society of Japan and the 31^31^ Linear Accelerator Meeting in Japan Pages: 832-834
  • Description: 「研究成果報告書概要(欧文)」より