Development of normal conducting harmonic cavity for diffraction-limited light source

• Project/Area Number: 17K05131
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Quantum beam science
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: Yamamoto Naoto 大学共同利用機関法人高エネルギー加速器研究機構, 加速器研究施設, 助教 (60377918)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 高周波空洞 / 放射光源加速器 / ビーム物理 / 減衰型空洞 / 放射光源リング / 加速器 / 光源技術

Outline of Final Research Achievements

Based on the results of 3D electro-magnetic simulation and structural/thermal analysis, a parasitic-mode damped cavity having a TM020-mode resonance frequency around 1.5 GHz was successfully designed. This cavity can be applied for the diffraction limited light source with the beam energy of 3 GeV.
In addition, a low-power cavity model dedicated for electro-magnetic measurements was also manufactured, and it was confirmed that the cavity performances expected from 3D electro-magnetic simulation could be reproduced.

Academic Significance and Societal Importance of the Research Achievements

本成果により、運用性及びメンテナンス性に優れた常伝導方式の高調波空洞の実現可能性が大いに高まった。常伝導方式でも超伝導方式に迫る性能を有する高調波空洞の実現は放射光源加速器分野の高調波空洞に関する常識を覆すことになり学術的意義が大きい。さらに、研究を進め実際の放射光リングにて安定なバンチ伸張運転をデモンストレーションできれば、世界中の既存施設においても高調波空洞の導入が一気に進むと思われる。

Research Products

• [Int'l Joint Research] Synchrotron SOLEIL/European Synchrotron Radiation Facility(フランス)
• [Int'l Joint Research] Paul Scherrer Institut(スイス)
• [Int'l Joint Research] Helmholtz-Zentrum Berlin(ドイツ)
• [Int'l Joint Research] Synchrotron SOLEIL/European Synchrotron Radiation Facility(フランス)
• [Int'l Joint Research] Paul Scherrer Institut(スイス)
• [Int'l Joint Research] Helmholtz-Zentrum Berlin(ドイツ)
• [Int'l Joint Research] Synchrotron SOLEIL(フランス)
• [Journal Article] Beam loading compensation for optimal bunch lengthening with harmonic cavities (2020)
  • Author(s): N. Yamamoto T. Takahashi S. Sakanaka
  • Journal Title: Proceedings of the ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators Volume: 0 Pages: 96-100
  • Peer Reviewed / Open Access
• [Journal Article] INVESTIGATION OF LONGITUDINAL BEAM DYNAMICS WITH HARMONIC CAVITIES BY USING THE CODE MBTRACK (2019)
  • Author(s): N. Yamamoto, A. Gamelin and R. Nagaoka
  • Journal Title: Proceedings of the 9th International Particle Accelerator Conference, IPAC’19 Volume: 1 Pages: 178-180
  • Open Access / Int'l Joint Research
• [Journal Article] Simulation study of parasitic-mode damping methods for a 1.5-GHz TM020-mode harmonic cavity (2018)
  • Author(s): N. Yamamoto, T. Takahashi, S. Sakanaka
  • Journal Title: Proceedings of the 9th International Particle Accelerator Conference, IPAC’18 Volume: 1 Pages: 2822-2825
  • Open Access
• [Journal Article] Reduction and compensation of the transient beam loading effect in a double rf system of synchrotron light sources (2018)
  • Author(s): Yamamoto, Naoto and Takahashi, Takeshi and Sakanaka, Shogo
  • Journal Title: Phys. Rev. Accel. Beams Volume: 21 Issue: 1 Pages: 012001-012001
  • DOI: 10.1103/physrevaccelbeams.21.012001
  • Peer Reviewed / Open Access
• [Journal Article] Simulation study of normal-conducting double rf system for the 3-GeV KEK light source project (2017)
  • Author(s): N. Yamamoto, T. Takahashi, S. Sakanaka
  • Journal Title: Proceedings of the 9th International Particle Accelerator Conference, IPAC’18 Volume: 1 Pages: 4176-4179
  • Open Access
• [Presentation] PF2.5GeVリングのハイブリッド運転モードへの高調波空洞導入の可能性 (2020)
  • Author(s): 山本 尚人，田中 織雅，高井 良太
  • Organizer: 第17回 日本加速器学会年会
• [Presentation] TM020型高調波空洞において寄生モード減衰機構が加速モードに与える影響 (2020)
  • Author(s): 山口 孝明，坂中 章悟，山本 尚人，内藤 大地，高橋 毅
  • Organizer: 第17回 日本加速器学会年会
• [Presentation] 次世代光源において過渡的ビーム負荷補償を行うためのキッカー空洞の検討 (2020)
  • Author(s): 内藤 大地，坂中 章悟，山本 尚人，高橋 毅，山口 孝明
  • Organizer: 第17回 日本加速器学会年会
• [Presentation] 蓄積リング粒子トラッキングコード MBTRACK による Static Robinson instability の再現 (2020)
  • Author(s): 山本尚人、山口孝明、坂中章悟、内藤大地、高橋毅
  • Organizer: 日本物理学会 第76回年次大会（2021年）
• [Presentation] INVESTIGATION OF LONGITUDINAL BEAM DYNAMICS WITH HARMONIC CAVITIES BY USING THE CODE MBTRACK (2019)
  • Author(s): N. Yamamoto, A. Gamelin and R. Nagaoka
  • Organizer: IPAC19-9th International Particle Accelerator Conference
  • Int'l Joint Research
• [Presentation] Beam loading compensation for optimal bunch lengthening with harmonic cavities (2019)
  • Author(s): N. Yamamoto
  • Organizer: ICFA mini-Workshop on "Mitigation of Coherent Beam Instabilities in particle accelerators" MCBI 2019
  • Int'l Joint Research / Invited
• [Presentation] 高調波空洞を用いた蓄積リングにおけるビームダイナミクスの研究 (2019)
  • Author(s): 山本尚人
  • Organizer: ビーム物理研究会2019
• [Presentation] 多粒子トラッキングコード mbtrack を用いたフォトンファクトリーハイブリッド運転時のバンチ長に関する研究 (2019)
  • Author(s): 山本尚人
  • Organizer: 日本物理学会 第75回年次大会（2020年）
• [Presentation] Simulation study of parasitic-mode damping methods for a 1.5-GHz TM020-mode harmonic cavity (2018)
  • Author(s): N. Yamamoto, T. Takahashi, S. Sakanaka
  • Organizer: IPAC18-8th International Particle Accelerator Conference
  • Int'l Joint Research
• [Presentation] Compensation of transient beam loading using a kicker cavity (2018)
  • Author(s): N. Yamamoto
  • Organizer: European Synchrotron Light Sources RF Meeting, ESLS-RF 2018 SHARE
  • Int'l Joint Research / Invited
• [Presentation] Compensation of transient rf voltage in a double RF system using a kicker cavity (2018)
  • Author(s): N. Yamamoto, T. Takahashi, S. Sakanaka
  • Organizer: Future Light source workshop 2018
  • Int'l Joint Research / Invited
• [Presentation] TM020モードを利用した高次モード減衰型1.5GHz高調波空洞の検討状況 (2018)
  • Author(s): 山本 尚人, 高橋 毅, 坂中 章悟
  • Organizer: 日本物理学会年会
• [Presentation] Simulation Study of Normal-Conducting Double RF System for the 3-GeV KEK Light Source Projec (2017)
  • Author(s): N. Yamamoto, T. Takahashi, S. Sakanaka
  • Organizer: IPAC 17 - 8th International Particle Accelerator Conference
  • Int'l Joint Research
• [Presentation] 1.5GHzTM020型空洞を用いたダブルRFシステムの検討 (2017)
  • Author(s): 山本尚人、高橋毅、坂中章悟
  • Organizer: 日本加速器学会
• [Presentation] マクロ粒子法と準解析的手法を用いた電子バンチ群とダブルRFシステムの相互作用の数値解析 (2017)
  • Author(s): 山本尚人、高橋毅、坂中章悟
  • Organizer: ビーム物理研究会2017