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Research on higher-order-mode (HOM) damping of superconducting cavities for the next-generation synchrotron light sources.

Research Project

Project/Area Number 15540300
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionHigh Energy Accelerator Research Organization (2004-2005)
The High Energy Accelerator Research Organization (2003)

Principal Investigator

SAKANAKA Shogo  High Energy Accelerator Research Organization (KEK), Institute of Material Structure Science (IMSS), Associate Professor, 物理構造科学研究所, 助教授 (20178560)

Co-Investigator(Kenkyū-buntansha) ISAWA Masaaki  High Energy Accelerator Research Organization (KEK), IMSS, Professor, 物理構造科学研究所, 教授 (10168164)
SAITO Kenji  High Energy Accelerator Research Organization (KEK), Associate Professor, 加速器研究施設, 助教授 (10178478)
UMEMORI Kensei  High Energy Accelerator Research Organization (KEK), IMSS, Research Assistant, 物理構造科学研究所, 助手 (60353364)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥2,300,000 (Direct Cost: ¥2,300,000)
KeywordsSuperconducting cavity / Energy Recovery Linac / ERL / higher order modes / beam instabilities / BBU / damping method / HOM coupler / 放射状線路 / チョーク構造 / Q値 / 高次モード減衰法 / 放射光源
Research Abstract

The superconducting (SC) linear accelerator (linac) is one of the key technologies for the next-generation synchrotron light sources. We investigated method of higher-order-mode (HOM) damping for superconducting cavities, that is, one of the important issues for the SC-linacs for preventing beam breakup (BBU) instabilities.
We applied the HOM damping method using radial-transmission lines to the 9-cell 1.3-GHz cavities. We investigated the Q-values of the principal HOMs by computer simulations, as well as by rf measurements of model copper cavity. The Q-values of HOMs depended strongly on the distance between the radial line and the end of the cavity. For the monopole modes, such as TM011-like and TM020-like modes, typical external Q-values of about 10,000 were obtained. For the dipole modes, typical Q-values were about 10,000 and about 10,000-100,000 for the TE111-like and the TM110-like modes, respectively. The HOM damping due to this method was good on the whole, however, further improvements are desirable for the TM110-like modes. We are trying to improve this point by such method as enlarging the beam-pipe radius from 39 mm (present) to larger ones.
From FY2005,the development of the energy recovery linac (ERL) for the next-generation synchrotron light sources started by collaboration between the High Energy Accelerator Research Organization (KEK) and the Japan Atomic Energy Agency (JAEA). A team for developing the SC cavities for this purpose was organized, and they started their research. The basic research results from our research are fully used for this purpose.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (8 results)

All 2006 2005 Other

All Journal Article (8 results)

  • [Journal Article] New higher-order-mode damping scheme for L-band superconducting cavilies using a radial transmission line2006

    • Author(s)
      K.Umemori, M.Izawa, K.Saito, S.Sakanaka
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A 557

      Pages: 272-272

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] New higher-order-mode damping scheme for L-band superconducting cavities using a radial transmission line2006

    • Author(s)
      K.Umemori, M.Izawa, K.Saito, S.Sakanaka
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A557

      Pages: 272-272

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] New higher-order-mode damping scheme for L-band superconducting cavities using a radial transmission line2006

    • Author(s)
      K.Umemori, H.Izawa, K.Saito, S.Sakanaka
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A 557

      Pages: 272-272

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Higher-order-mode damping of L-band superconducting cavity using a radial-line HOM damper2005

    • Author(s)
      K.Umemori, M.Izawa, K.Saito, S.Sakanaka
    • Journal Title

      Proceedings of 2005 Particle Accelerator Conference, May 16-20, 2005, Knoxville, Tennessee, U.S.A.

      Pages: 3606-3606

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Higher-order-mode damping of L-band superconducting cavity using a radial-line HOM damper2005

    • Author(s)
      K.Umemori, H.Izawa, K.Saito, S.Sakanaka
    • Journal Title

      Proceedings of 2005 Particle Accelerator Conference, May 16-20,2005,Knoxville, Tennessee, U.S.A.

      Pages: 3606-3606

    • Related Report
      2005 Annual Research Report
  • [Journal Article] L-バンド超伝導加速空洞のためのラジアル型HOMダンパーの研究

    • Author(s)
      K.Umemori, M.Izawa, K.Saito, S.Sakanaka
    • Journal Title

      第2回日本加速器学会年会・第29回リニアック技術研究会報告集、2005年7月20-22日、鳥栖、(報告集公開) (準備中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Higher-order-mode damping of L-band superconducting cavity using a radial-line HOM damper

    • Author(s)
      K.Umemori, M.Izawa, K.Saito, S.Sakanaka
    • Journal Title

      Proceedings of 2005 Particle Accelerator Conference (May 16-20, 2005, Knoxville, Tennessee, U.S.A.)

      Pages: 3606-3606

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Study of a radia-line HOM damper for the L-band superconducting cavity

    • Author(s)
      K.Umemori, M.Izawa, K.Saito, S.Sakanaka
    • Journal Title

      Proceedings of the 2nd Annual Meeting of Particle Accelerator Society of Japan and the 29th Linear Accelerator Meeting in Japan (July 20-22, 2005, Tosu, Fukuoka, Japan.) (Proceedings in preparation)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary

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Published: 2003-04-01   Modified: 2016-04-21  

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